mygo

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 Go to latest Published: Sep 30, 2026 License: MIT Imports: 43 Imported by: 0

README

MyGo

Desktop apps with Go and a web frontend, on the system webview.

MyGo apps show their UI in the webview the OS already has: WKWebView on macOS, WebKitGTK on Linux, WebView2 on Windows. An app is a single Go binary of a few megabytes, focused on low memory and CPU use.

  • Pure Go, no cgo: build for every platform from any machine.
  • Typed IPC: bind Go services, stream values through channels and send typed events; the TypeScript client is generated from your Go code.
  • Desktop APIs: windows, menus, tray, dialogs, notifications, global shortcuts, deep links, file associations and more.
  • Ready to ship: app bundles and disk images, Windows installers, Debian packages, code signing, notarization and signed auto-updates.
type Greeter struct{}

// Greet returns a greeting.
func (Greeter) Greet(name string) string { return "Hello, " + name }

func main() {
	mygo.Bind(Greeter{})
	mygo.App.WhenReady(func() {
		mygo.NewWindow(mygo.WindowOptions{Title: "Hello", URL: "/"})
	})
	if err := mygo.App.Run(); err != nil {
		log.Fatal(err)
	}
}

import { Greeter } from "./mygo"; // generated

document.body.textContent = await Greeter.greet("Ada");

Getting started

With Go 1.27+ and Bun:

bunx mygo-cli init my-app      # or: npx mygo-cli init my-app
cd my-app
bun run dev

Or, without npm — the CLI is a Go program, which Go runs too:

go run github.com/egoist/mygo/cmd/mygo@latest init my-app
cd my-app
bun run dev

Read the documentation.

Status

MyGo is at v0.1: the system webview on macOS 12+, Linux and Windows 10+ (x64 and arm64). v0.2 will add a bundled CEF option.

License

MIT

Documentation

Overview

Package mygo is a desktop application framework built on the system webview (WKWebView on macOS, WebKitGTK on Linux, WebView2 on Windows), written in pure Go without cgo.

An app binds Go services, whose exported methods its web frontend calls through a TypeScript client that `mygo generate` writes, and opens windows once it is ready: 

type Greeter struct{}

// Greet returns a greeting.
func (Greeter) Greet(name string) string { return "Hello, " + name }

func main() {
	mygo.Bind(Greeter{})
	mygo.App.WhenReady(func() {
		mygo.NewWindow(mygo.WindowOptions{Title: "Hello", URL: "/"})
	})
	if err := mygo.App.Run(); err != nil {
		log.Fatal(err)
	}
}

The frontend then calls `await Greeter.greet("Ada")`. Go reaches pages with typed events declared with NewEvent.

The rest of the package covers the desktop: App (the lifecycle, deep links, file associations, the Dock), Window, NewMenu and NewTray, Dialog, NewNotification, Clipboard, Shell, Screen, Theme, Power, GlobalShortcut, Protocol (custom URL schemes served by an http.Handler) and Updater. The guides in the repository's docs directory show how they fit together.

Threading

Native UI toolkits must be driven from the process' main thread. MyGo locks the main goroutine to the main thread during package initialization, so App.Run must be called from main(). Every other function and method in this package is safe to call from any goroutine: calls made off the main thread are forwarded to it and wait for the result.

Before App.Run, main sets the app up: it binds services, adds listeners and makes settings, such as Theme.SetSource, which apply once the app starts. Calls that need the running app, such as the clipboard, displays or dialogs, panic when main makes them before Run; other goroutines wait for the app to start.

Event listeners (OnClose, OnFocus, ...) run on the main thread; keep them short and move slow work to a goroutine. Methods of bound services run on goroutines of their own, one per call, so they may block.

Index

Constants

View Source 
const Version = "0.1.10"

Version is the MyGo version.

Variables

View Source 
var (
	PageLetter  = PageSize{8.5, 11}
	PageLegal   = PageSize{8.5, 14}
	PageTabloid = PageSize{11, 17}
	PageA3      = PageSize{11.69, 16.54}
	PageA4      = PageSize{8.27, 11.69}
	PageA5      = PageSize{5.83, 8.27}
)

Paper sizes.

View Source 
var App = &Application{readyCh: make(chan struct{}), Dock: &Dock{}}

App is the application singleton.

View Source 
var ErrChannelClosed = errors.New("mygo: channel closed")

ErrChannelClosed is returned by Channel.Send once the channel is closed.

View Source 
var ErrUpdatesDisabled = errors.New("mygo: updates are not enabled for this build")

ErrUpdatesDisabled is returned by Check for builds without updates: development builds, and builds of apps without updates in mygo.config.ts.

View Source 
var GlobalShortcut = &GlobalShortcutModule{}

GlobalShortcut registers keyboard shortcuts that work while the app is in the background.

View Source 
var Power = &PowerModule{}

Power reports power and session changes and keeps the computer awake.

View Source 
var Protocol = &ProtocolModule{handlers: map[string]http.Handler{}}

Protocol serves custom URL schemes such as app:// from Go.

View Source 
var Screen = &ScreenModule{}

Screen describes the connected displays.

View Source 
var Theme = &ThemeModule{}

Theme is the system appearance. Pages follow it through the prefers-color-scheme media query.

View Source 
var Updater = &UpdaterModule{}

Updater installs new versions of the app.

Functions

func Bind 

func Bind(services ...any)

Bind exposes the exported methods of each service to the frontend. The generated TypeScript client (see `mygo generate`) turns 

type Greeter struct{}

// Greet returns a greeting.
func (Greeter) Greet(name string) (string, error)

into a typed `Greeter.greet(name: string): Promise<string>` function.

Arguments and results are encoded as JSON. A method may take a context.Context as its first parameter: it is canceled when the calling page navigates away or its window closes, and CallerWindow returns the calling window from it. A method may return nothing, a value, an error, or a value and an error; a non-nil error rejects the promise on the JavaScript side. Calls run on their own goroutine.

The service is named after its type; Bind panics if the name is taken or a method uses a type that cannot be encoded as JSON (channels, functions).

func BindAs 

func BindAs(name string, service any)

BindAs is Bind with an explicit service name, for services whose type names collide.

func EvalAs 

func EvalAs[T any](w *Window, code string) (T, error)

EvalAs evaluates JavaScript like Window.Eval and decodes the result into a value of type T. 

title, err := mygo.EvalAs[string](win, "document.title")

func FileServer 

func FileServer(fsys fs.FS) http.Handler

FileServer serves files from fsys and falls back to index.html for unknown paths without an extension, so client side routers work. Files are served with their content type and support range requests.

func GenerateTypeScript 

func GenerateTypeScript() ([]byte, error)

GenerateTypeScript renders the typed TypeScript client for all services bound with Bind and events declared with NewEvent.

You rarely call this directly: `mygo generate` runs your app with the MYGO_GENERATE environment variable set, which makes App.Run write the client and return before opening any window.

func IsDev 

func IsDev() bool

IsDev reports whether the app runs in development: true unless it was built for production with `mygo build`, or MYGO_ENV=production is set. Development builds enable the web inspector by default.

func NotificationsSupported 

func NotificationsSupported() bool

NotificationsSupported reports whether desktop notifications can be shown. On macOS they require a packaged app, which `mygo dev` and `mygo build` produce.

func RunOnMain 

func RunOnMain(fn func())

RunOnMain runs fn on the main (UI) thread and waits for it to return. Use it to call native APIs directly, e.g. through Window.NativeHandle. It runs fn right away when called on the main thread, and drops it after the application has quit.

func SetFrontend 

func SetFrontend(fsys fs.FS)

SetFrontend serves fsys as the app's frontend at mygo://localhost/. Paths without a file extension that match no file serve index.html, for client-side routing.

`mygo build` calls it with the frontendDist files it embeds into the app, so apps rarely need to. Call it to ship a frontend without the mygo CLI, e.g. from an embed.FS.

func Use added in v0.1.8 

func Use(ps ...Plugin)

Use adds plugins to the app. Call it before App.Run, like Bind. Use panics when a plugin is invalid, already used, or its Setup fails.

func WriteTypeScript 

func WriteTypeScript(path string) error

WriteTypeScript writes the TypeScript client to path, creating parent directories. The file is left untouched when its content did not change, so frontend dev servers do not reload needlessly.

Types

type AboutPanelOptions 

type AboutPanelOptions struct {
	ApplicationName    string
	ApplicationVersion string
	// Version is the build version shown next to ApplicationVersion.
	Version   string
	Copyright string
	Credits   string
}

AboutPanelOptions customizes the standard about panel.

type ActivationPolicy 

type ActivationPolicy string

ActivationPolicy controls how a macOS application appears in the Dock and app switcher. 

const (
	// ActivationPolicyRegular is an ordinary app with a Dock icon and menu bar.
	ActivationPolicyRegular ActivationPolicy = "regular"
	// ActivationPolicyAccessory hides the Dock icon; windows can still be
	// shown. Typical for menu bar (tray) apps.
	ActivationPolicyAccessory ActivationPolicy = "accessory"
	// ActivationPolicyProhibited hides the app entirely.
	ActivationPolicyProhibited ActivationPolicy = "prohibited"
)

Activation policies.

type Application 

type Application struct {

	// Dock controls the Dock icon on macOS.
	Dock *Dock
	// contains filtered or unexported fields
}

Application controls the event loop and the lifecycle of the process. Use the App singleton.

func (*Application) ClearBrowsingData 

func (a *Application) ClearBrowsingData() error

ClearBrowsingData deletes what the app's pages stored: cookies, local and session storage, IndexedDB, service workers and caches, e.g. when the user signs out. Open pages keep what they hold in memory until they are reloaded.

func (*Application) Exit 

func (a *Application) Exit(code int)

Exit terminates the process immediately with the given exit code, without emitting quit events or asking windows.

func (*Application) Focus 

func (a *Application) Focus()

Focus brings the application to the foreground.

func (*Application) Hide 

func (a *Application) Hide()

Hide hides all windows of the application (macOS).

func (*Application) IsHidden 

func (a *Application) IsHidden() bool

IsHidden reports whether the application is hidden (macOS).

func (*Application) IsPackaged 

func (a *Application) IsPackaged() bool

IsPackaged reports whether the application runs from an app bundle (created by `mygo dev` and `mygo build`) rather than a plain executable.

func (*Application) IsReady 

func (a *Application) IsReady() bool

IsReady reports whether the application has finished launching.

func (*Application) IsURLSchemeRegistered 

func (a *Application) IsURLSchemeRegistered(scheme string) bool

IsURLSchemeRegistered reports whether the system opens URLs of scheme with this app.

func (*Application) Locale 

func (a *Application) Locale() string

Locale returns the user's preferred locale, e.g. "en-US".

func (*Application) Menu 

func (a *Application) Menu() *Menu

Menu returns the application menu.

func (*Application) Name 

func (a *Application) Name() string

Name returns the application name. It defaults to the bundle name of a packaged app, else to the executable name.

func (*Application) OnActivate 

func (a *Application) OnActivate(fn func(hasVisibleWindows bool)) (off func())

OnActivate is called when the application is re-activated, for example by clicking its Dock icon (macOS). Apps usually open a window when hasVisibleWindows is false.

func (*Application) OnBeforeQuit 

func (a *Application) OnBeforeQuit(fn func(e *QuitEvent)) (off func())

OnBeforeQuit is called when a quit starts, before windows are closed.

func (*Application) OnDidBecomeActive 

func (a *Application) OnDidBecomeActive(fn func()) (off func())

OnDidBecomeActive is called when the application becomes the active one.

func (*Application) OnDidResignActive 

func (a *Application) OnDidResignActive(fn func()) (off func())

OnDidResignActive is called when the application stops being active.

func (*Application) OnOpenFile 

func (a *Application) OnOpenFile(fn func(path string)) (off func())

OnOpenFile is called when a file is opened with the application: one of the types of fileAssociations in mygo.config.ts opened from the file manager, a file dropped on the Dock icon (macOS), or one passed on the command line. Register it before Run to receive the files the app was launched with; on Windows and Linux, RequestSingleInstanceLock makes the first instance get those of later ones.

func (*Application) OnOpenURL 

func (a *Application) OnOpenURL(fn func(url string)) (off func())

OnOpenURL is called when the application is asked to open a URL of a scheme it handles: one listed in urlSchemes in mygo.config.ts or registered with RegisterURLScheme. Register it before Run to receive the URL the app was launched with. On Windows and Linux, where a URL starts a new instance of the app, use RequestSingleInstanceLock so that the first instance gets the URLs of later ones.

func (*Application) OnQuit 

func (a *Application) OnQuit(fn func()) (off func())

OnQuit is called after the event loop has stopped.

func (*Application) OnReady 

func (a *Application) OnReady(fn func()) (off func())

OnReady is called once the application has finished launching.

func (*Application) OnSecondInstance 

func (a *Application) OnSecondInstance(fn func(args []string, workingDir string)) (off func())

OnSecondInstance is called in the first instance when another instance was started and called RequestSingleInstanceLock. Apps usually focus their main window here.

func (*Application) OnWillQuit 

func (a *Application) OnWillQuit(fn func(e *QuitEvent)) (off func())

OnWillQuit is called after all windows have been closed, right before the event loop stops.

func (*Application) OnWindowAllClosed 

func (a *Application) OnWindowAllClosed(fn func()) (off func())

OnWindowAllClosed is called when the last window has been closed, unless the application is quitting. Without listeners the application quits; registering one keeps it running (the common choice on macOS).

func (*Application) OnWindowCreated 

func (a *Application) OnWindowCreated(fn func(w *Window)) (off func())

OnWindowCreated is called for every new window.

func (*Application) OpenAtLogin 

func (a *Application) OpenAtLogin() bool

OpenAtLogin reports whether the app starts when the user logs in.

func (*Application) Path 

func (a *Application) Path(name PathName) (string, error)

Path returns a well known directory, for example where to store user data: 

dir, err := mygo.App.Path(mygo.PathUserData)

func (*Application) Quit 

func (a *Application) Quit()

Quit closes all windows and then quits. OnBeforeQuit and OnWillQuit listeners, as well as the OnClose listeners of every window, can cancel it.

func (*Application) RegisterURLScheme 

func (a *Application) RegisterURLScheme(scheme string) error

RegisterURLScheme makes the app the handler of the URLs of scheme for the current user, e.g. myapp://open?item=1 for "myapp": they reach OnOpenURL, including the one the app is started with. Call it before Run, typically every time the app starts: registering again is cheap.

On Windows it registers the executable under HKEY_CURRENT_USER, on Linux a hidden desktop entry that becomes the default handler (as xdg-mime does). On macOS the scheme must be listed in urlSchemes in mygo.config.ts, which registers it with the system; this makes the app its default handler when others claim it too. Unregister it when the app is uninstalled, for example with UnregisterURLScheme.

func (*Application) Relaunch 

func (a *Application) Relaunch()

Relaunch quits the app like Quit, then starts it again with the same arguments, e.g. after changing a setting that needs a restart. Nothing happens when OnBeforeQuit, OnWillQuit or a window cancels the quit. Under `mygo dev` the build exits once it has quit and mygo dev starts it again.

func (*Application) RequestSingleInstanceLock 

func (a *Application) RequestSingleInstanceLock() bool

RequestSingleInstanceLock makes sure a single instance of the app runs. It returns true in the first instance. In any later instance it returns false after forwarding its command line arguments and working directory to the first one (see OnSecondInstance); that instance should then exit: 

if !mygo.App.RequestSingleInstanceLock() {
	return
}

The lock is identified by the application name and released on quit. Under `mygo dev`, a reload starts the new build while the previous one still runs, so the new build takes the lock over.

func (*Application) Run 

func (a *Application) Run() error

Run starts the native event loop and blocks until the application quits. It must be called from the main goroutine, usually as the last statement of main.

SIGINT and SIGTERM quit the application like Quit; a second signal exits immediately.

When the MYGO_GENERATE environment variable is set (see `mygo generate`), Run writes the TypeScript client for the bound services to that path and returns without starting the event loop.

func (*Application) SetActivationPolicy 

func (a *Application) SetActivationPolicy(p ActivationPolicy)

SetActivationPolicy changes how the app appears in the Dock (macOS).

func (*Application) SetBadgeCount 

func (a *Application) SetBadgeCount(n int)

SetBadgeCount shows a counter on the application icon. Zero clears it.

func (*Application) SetMenu 

func (a *Application) SetMenu(m *Menu)

SetMenu sets the application menu: the menu bar on macOS and the menu bar of windows without their own menu on Linux and Windows. nil removes it. Without a call to SetMenu a default menu with the usual App, Edit, View and Window items is installed.

func (*Application) SetName 

func (a *Application) SetName(name string)

SetName overrides the application name. Call it before Run.

func (*Application) SetOpenAtLogin 

func (a *Application) SetOpenAtLogin(open bool) error

SetOpenAtLogin makes the app start when the user logs in, or stops it from doing so. Apps usually offer it as a setting: 

if err := mygo.App.SetOpenAtLogin(enabled); err != nil { … }

On macOS 13 and later the app becomes a login item of the user (System Settings > General > Login Items), which needs an app bundle; on macOS 12 a launch agent starts it. On Linux it gets an XDG autostart entry, on Windows a Run entry of the user, which Task Manager can disable.

func (*Application) SetPath 

func (a *Application) SetPath(name PathName, path string)

SetPath overrides a directory returned by Path.

func (*Application) SetVersion 

func (a *Application) SetVersion(v string)

SetVersion overrides the application version.

func (*Application) Show 

func (a *Application) Show()

Show shows the application after Hide (macOS).

func (*Application) ShowAboutPanel 

func (a *Application) ShowAboutPanel(opts AboutPanelOptions)

ShowAboutPanel shows the standard about panel (macOS).

func (*Application) UnregisterURLScheme 

func (a *Application) UnregisterURLScheme(scheme string) error

UnregisterURLScheme undoes RegisterURLScheme (Linux, Windows); URLs of the scheme no longer reach the app unless mygo.config.ts declares it.

func (*Application) Version 

func (a *Application) Version() string

Version returns the application version, which defaults to the version of the packaged app.

func (*Application) WasOpenedAtLogin 

func (a *Application) WasOpenedAtLogin() bool

WasOpenedAtLogin reports whether the system started the app because the user logged in, e.g. to start it in the background: 

mygo.NewWindow(mygo.WindowOptions{URL: "/", Hidden: mygo.App.WasOpenedAtLogin()})

func (*Application) WhenReady 

func (a *Application) WhenReady(fn func())

WhenReady calls fn on the main thread once the application has finished launching. Windows can only be created after that point. If the application is already ready, fn is scheduled right away.

type Channel added in v0.1.3 

type Channel[T any] struct {
	// contains filtered or unexported fields
}

Channel streams values of type T from a bound method to the page that called it, like a response that arrives in parts: the lines a command prints, the tokens of a model's answer, the progress of a download. The method takes it as a parameter: 

// Tail sends the lines of a command's output as it prints them.
func (Shell) Tail(ctx context.Context, command string, lines *mygo.Channel[string]) error {
	cmd := exec.CommandContext(ctx, "sh", "-c", command)
	out, err := cmd.StdoutPipe()
	if err != nil {
		return err
	}
	if err := cmd.Start(); err != nil {
		return err
	}
	scanner := bufio.NewScanner(out)
	for scanner.Scan() {
		if err := lines.Send(scanner.Text()); err != nil {
			return err
		}
	}
	return cmd.Wait()
}

and the page passes a Channel of mygo-runtime in its place, whose values it iterates or handles with onmessage: 

const lines = new Channel<string>();
const done = Shell.tail("ping -c 3 example.com", lines);
for await (const line of lines) output.append(line + "\n");
await done;

Values arrive in order, and before the call's result. The channel closes when the method returns, or earlier with Close, which ends the page's iteration. The page may close it too, for example by breaking out of the loop: Send then fails and the context of the call is canceled, which stops the work the method passed it to. Navigating away and closing the window do the same.

Send waits while the page has more than a MiB of values yet to take, so a fast producer does not pile them up in memory, except on the main thread, which must not wait.

Channels are parameters of bound methods only, never parts of other values.

func (*Channel[T]) Close added in v0.1.3 

func (ch *Channel[T]) Close()

Close closes the channel, which ends the page's iteration once it took the values sent before. It is called when the method returns.

func (*Channel[T]) Send added in v0.1.3 

func (ch *Channel[T]) Send(v T) error

Send sends v to the page. It fails once the channel is closed.

type ClipboardModule 

type ClipboardModule struct{}

ClipboardModule reads and writes the system clipboard. 

var Clipboard ClipboardModule

Clipboard is the system clipboard.

func (ClipboardModule) AvailableFormats 

func (ClipboardModule) AvailableFormats() []string

AvailableFormats lists the formats (MIME types or platform types) on the clipboard.

func (ClipboardModule) Clear 

func (ClipboardModule) Clear()

Clear empties the clipboard.

func (ClipboardModule) ReadHTML 

func (ClipboardModule) ReadHTML() string

ReadHTML returns the HTML on the clipboard.

func (ClipboardModule) ReadImage 

func (ClipboardModule) ReadImage() []byte

ReadImage returns the image on the clipboard as PNG, or nil.

func (ClipboardModule) ReadText 

func (ClipboardModule) ReadText() string

ReadText returns the plain text on the clipboard.

func (ClipboardModule) WriteHTML 

func (ClipboardModule) WriteHTML(markup string)

WriteHTML puts HTML on the clipboard.

func (ClipboardModule) WriteImage 

func (ClipboardModule) WriteImage(png []byte) error

WriteImage puts a PNG image on the clipboard.

func (ClipboardModule) WriteText 

func (ClipboardModule) WriteText(text string)

WriteText puts plain text on the clipboard.

type CloseEvent 

type CloseEvent struct {
	Preventable
	Window *Window
}

CloseEvent is passed to Window.OnClose listeners. Preventing it keeps the window open.

type DevTools 

type DevTools int

DevTools selects whether the web inspector is available. 

const (
	// DevToolsAuto enables the inspector unless the app was built for
	// production with `mygo build`.
	DevToolsAuto DevTools = iota
	DevToolsEnabled
	DevToolsDisabled
)

DevTools modes.

type DialogModule 

type DialogModule struct{}

DialogModule shows native dialogs. Its methods block until the dialog is dismissed; they can be called from any goroutine. 

var Dialog DialogModule

Dialog shows native file and message dialogs.

func (DialogModule) Error 

func (d DialogModule) Error(title, content string)

Error shows a modal error dialog.

func (DialogModule) Message 

func (DialogModule) Message(opts MessageOptions) (MessageResult, error)

Message shows a message dialog and reports which button was clicked.

func (DialogModule) Open 

func (DialogModule) Open(opts OpenDialogOptions) ([]string, error)

Open shows a dialog to pick files or directories and returns the chosen paths, or nil when canceled.

func (DialogModule) Save 

func (DialogModule) Save(opts SaveDialogOptions) (string, error)

Save shows a dialog to choose where to save a file and returns the path, or "" when canceled.

type Display 

type Display struct {
	ID    int64
	Label string
	// Bounds is the area of the display in screen coordinates.
	Bounds Rectangle
	// WorkArea excludes the menu bar, Dock and taskbars.
	WorkArea    Rectangle
	ScaleFactor float64
	Rotation    int
	Internal    bool
	Primary     bool
}

Display describes a monitor.

type Dock 

type Dock struct {
	// contains filtered or unexported fields
}

Dock controls the application's Dock icon (macOS). Its methods do nothing on other platforms.

func (*Dock) Badge 

func (d *Dock) Badge() string

Badge returns the text shown on the Dock icon.

func (*Dock) Bounce 

func (d *Dock) Bounce(critical bool) int

Bounce bounces the Dock icon to request attention and returns an id for CancelBounce. Critical bounces continue until the app is activated.

func (*Dock) CancelBounce 

func (d *Dock) CancelBounce(id int)

CancelBounce stops a bounce started with Bounce.

func (*Dock) Hide 

func (d *Dock) Hide()

Hide removes the Dock icon (accessory activation policy).

func (*Dock) Menu 

func (d *Dock) Menu() *Menu

Menu returns the menu set with SetMenu.

func (*Dock) SetBadge 

func (d *Dock) SetBadge(text string)

SetBadge shows text on the Dock icon; "" clears it.

func (*Dock) SetIcon 

func (d *Dock) SetIcon(png []byte) error

SetIcon replaces the Dock icon with a PNG image.

func (*Dock) SetMenu 

func (d *Dock) SetMenu(m *Menu)

SetMenu sets the menu the Dock icon shows above the standard items, e.g. to open a new window; nil removes it. It may be called before App.Run.

func (*Dock) Show 

func (d *Dock) Show()

Show restores the Dock icon (regular activation policy).

type Download 

type Download struct {
	URL  string
	Path string
	// Err is why the download failed, or nil.
	Err error
}

Download is a finished download, passed to Window.OnDownloadDone.

type DownloadEvent 

type DownloadEvent struct {
	Preventable
	// URL of the download.
	URL string
	// SuggestedName is the file name the page or the server suggests.
	SuggestedName string
	// Path is where the file is saved: by default SuggestedName in the
	// Downloads directory, numbered when a file has that name. A file
	// already at a Path listeners set is replaced.
	Path string
}

DownloadEvent is passed to Window.OnWillDownload listeners. Setting Path chooses where the file goes; preventing the event cancels the download.

type EvalError 

type EvalError struct {
	Message string
}

EvalError is returned by Eval when the script throws.

func (*EvalError) Error 

func (e *EvalError) Error() string

type Event 

type Event[T any] struct {
	// contains filtered or unexported fields
}

Event is a typed event the Go side sends to pages. Declare events at package level so `mygo generate` includes them in the TypeScript client: 

var Progress = mygo.NewEvent[ProgressInfo]("progress")

Progress.Emit(win, ProgressInfo{Done: 1, Total: 3})

and subscribe in the frontend with `events.progress.on(p => ...)`.

func NewEvent 

func NewEvent[T any](name string) *Event[T]

NewEvent declares an event with payload type T. Names must be unique; those starting with "mygo:" are reserved.

func (*Event[T]) Broadcast 

func (e *Event[T]) Broadcast(payload T) error

Broadcast sends the event to every window.

func (*Event[T]) Emit 

func (e *Event[T]) Emit(w *Window, payload T) error

Emit sends the event to the page shown in w. Events sent before the page's DOM is ready are delivered once it is.

func (*Event[T]) Name 

func (e *Event[T]) Name() string

Name returns the event name.

type FileDropEvent 

type FileDropEvent struct {
	// Paths of the dropped files and directories.
	Paths []string `json:"paths"`
	// X and Y are where the files were dropped, in CSS pixels from the
	// top-left corner of the page's viewport, like a DOM event's clientX
	// and clientY.
	X int `json:"x"`
	Y int `json:"y"`
}

FileDropEvent is passed to Window.OnFileDrop listeners, and to the page's onFileDrop listeners.

type FileFilter 

type FileFilter struct {
	Name       string
	Extensions []string
}

FileFilter limits the files a file dialog shows, e.g. {Name: "Images", Extensions: []string{"png", "jpg"}}.

type FindOptions 

type FindOptions struct {
	// MatchCase finds only text with the same capitalization.
	MatchCase bool
	// Backward goes to the previous match rather than the next one.
	Backward bool
	// FindNext moves on from the current match of the same text; without
	// it the search starts over at the first match (the last, Backward).
	FindNext bool
}

FindOptions configures Window.FindInPage.

type FindResult 

type FindResult struct {
	// Matches is how many there are on the page, Active which of them is
	// the current one, from 1; both are 0 without matches.
	Matches int `json:"matches"`
	Active  int `json:"active"`
}

FindResult reports the matches of Window.FindInPage.

type GlobalShortcutModule 

type GlobalShortcutModule struct {
	// contains filtered or unexported fields
}

GlobalShortcutModule registers system wide keyboard shortcuts.

func (*GlobalShortcutModule) IsRegistered 

func (g *GlobalShortcutModule) IsRegistered(acc string) bool

IsRegistered reports whether accelerator is registered by this app.

func (*GlobalShortcutModule) Register 

func (g *GlobalShortcutModule) Register(acc string, fn func()) error

Register calls fn on the main thread whenever accelerator (e.g. "CmdOrCtrl+Shift+Space") is pressed, even when the app is not focused.

On Wayland the desktop binds the shortcut, through the XDG desktop portal, shortly after Register returns: it may ask the user to confirm it, lets them pick other keys, and needs the app installed with its desktop entry. The window fn shows or focuses first gets the activation token of the key press, which lets it take the focus.

func (*GlobalShortcutModule) Unregister 

func (g *GlobalShortcutModule) Unregister(acc string)

Unregister removes a shortcut.

func (*GlobalShortcutModule) UnregisterAll 

func (g *GlobalShortcutModule) UnregisterAll()

UnregisterAll removes all shortcuts registered by this app.

type LoadError 

type LoadError struct {
	URL         string
	Code        int
	Description string
}

LoadError describes a failed page load.

func (*LoadError) Error 

func (e *LoadError) Error() string

type Margins 

type Margins struct{ Top, Right, Bottom, Left float64 }

Margins are page margins in inches. 

type Menu struct {
	// contains filtered or unexported fields
}

Menu is a list of menu items used as application menu, window menu, context menu or tray menu.

func NewMenu 

func NewMenu(items []*MenuItem) *Menu

NewMenu builds a menu from a template: 

menu := mygo.NewMenu([]*mygo.MenuItem{
	{Role: mygo.RoleAppMenu},
	{Label: "File", Submenu: []*mygo.MenuItem{
		{Label: "New Window", Accelerator: "CmdOrCtrl+N", Click: newWindow},
		mygo.Separator(),
		{Role: mygo.RoleClose},
	}},
	{Role: mygo.RoleEditMenu},
})

func (m *Menu) Append(items ...*MenuItem)

Append adds items at the end of the menu. 

func (m *Menu) Insert(pos int, item *MenuItem)

Insert adds item at position pos. 

func (m *Menu) ItemByID(id string) *MenuItem

ItemByID finds an item by ID in the menu and its submenus. 

func (m *Menu) Items() []*MenuItem

Items returns the items of the menu. 

func (m *Menu) Popup(win *Window)

Popup shows the menu as a context menu at the mouse position over win. It returns once the menu is closed. 

func (m *Menu) PopupAt(win *Window, x, y int)

PopupAt shows the menu as a context menu at a position relative to the top-left corner of win's page area. 

type MenuItem struct {
	// ID identifies the item for Menu.ItemByID.
	ID    string
	Label string
	Type  MenuItemType
	// Role gives the item a predefined behavior; Label and Accelerator
	// default to the role's.
	Role MenuRole
	// Accelerator is a keyboard shortcut such as "CmdOrCtrl+Shift+N".
	Accelerator string
	Disabled    bool
	Hidden      bool
	// Checked is the state of checkbox and radio items. It is toggled
	// before Click is called.
	Checked bool
	ToolTip string
	Submenu []*MenuItem
	// Click is called on the main thread when the item is chosen. win is
	// the focused window, or nil.
	Click func(item *MenuItem, win *Window)
	// contains filtered or unexported fields
}

MenuItem is an entry of a Menu. Fill in the exported fields to build a menu template; after the item has been added to a menu, change its state with the Set methods so native menus update.

func Separator 

func Separator() *MenuItem

Separator returns a separator item. 

func (it *MenuItem) IsChecked() bool

IsChecked reports whether a checkbox or radio item is checked. 

func (it *MenuItem) IsEnabled() bool

IsEnabled reports whether the item is enabled. 

func (it *MenuItem) IsVisible() bool

IsVisible reports whether the item is visible. 

func (it *MenuItem) SetAccelerator(acc string)

SetAccelerator changes the keyboard shortcut of the item. 

func (it *MenuItem) SetChecked(v bool)

SetChecked checks or unchecks a checkbox or radio item. 

func (it *MenuItem) SetEnabled(v bool)

SetEnabled enables or disables the item. 

func (it *MenuItem) SetLabel(label string)

SetLabel changes the label of the item. 

func (it *MenuItem) SetVisible(v bool)

SetVisible shows or hides the item. 

type MenuItemType string

MenuItemType is the kind of a menu item. 

const (
	MenuItemNormal    MenuItemType = "normal"
	MenuItemSeparator MenuItemType = "separator"
	MenuItemSubmenu   MenuItemType = "submenu"
	MenuItemCheckbox  MenuItemType = "checkbox"
	MenuItemRadio     MenuItemType = "radio"
)

Menu item kinds. The type is inferred when empty: items with a Submenu are submenus, everything else is a normal item. 

type MenuRole string

MenuRole gives a menu item a predefined behavior, label and accelerator. 

const (
	RoleUndo               MenuRole = "undo"
	RoleRedo               MenuRole = "redo"
	RoleCut                MenuRole = "cut"
	RoleCopy               MenuRole = "copy"
	RolePaste              MenuRole = "paste"
	RolePasteAndMatchStyle MenuRole = "pasteAndMatchStyle"
	RoleDelete             MenuRole = "delete"
	RoleSelectAll          MenuRole = "selectAll"
	RoleReload             MenuRole = "reload"
	RoleForceReload        MenuRole = "forceReload"
	RoleToggleDevTools     MenuRole = "toggleDevTools"
	RoleResetZoom          MenuRole = "resetZoom"
	RoleZoomIn             MenuRole = "zoomIn"
	RoleZoomOut            MenuRole = "zoomOut"
	RoleToggleFullScreen   MenuRole = "togglefullscreen"
	RoleMinimize           MenuRole = "minimize"
	RoleZoom               MenuRole = "zoom"
	RoleClose              MenuRole = "close"
	RoleQuit               MenuRole = "quit"
	RoleAbout              MenuRole = "about"         // (macOS)
	RoleHide               MenuRole = "hide"          // (macOS)
	RoleHideOthers         MenuRole = "hideOthers"    // (macOS)
	RoleUnhide             MenuRole = "unhide"        // (macOS)
	RoleFront              MenuRole = "front"         // (macOS)
	RoleServices           MenuRole = "services"      // (macOS) submenu
	RoleStartSpeaking      MenuRole = "startSpeaking" // (macOS)
	RoleStopSpeaking       MenuRole = "stopSpeaking"  // (macOS)
	RoleWindow             MenuRole = "window"        // submenu listing open windows (macOS)
	RoleHelp               MenuRole = "help"          // submenu with the search field (macOS)
	RoleAppMenu            MenuRole = "appMenu"       // default application menu
	RoleFileMenu           MenuRole = "fileMenu"      // default File menu
	RoleEditMenu           MenuRole = "editMenu"      // default Edit menu
	RoleViewMenu           MenuRole = "viewMenu"      // default View menu
	RoleWindowMenu         MenuRole = "windowMenu"    // default Window menu
)

Menu roles. Roles marked (macOS) are ignored elsewhere.

type MessageOptions 

type MessageOptions struct {
	Parent  *Window
	Type    MessageType
	Title   string
	Message string
	// Detail is shown below Message in a smaller font.
	Detail string
	// Buttons defaults to a single "OK" button.
	Buttons []string
	// DefaultButton is the index of the button activated with Enter.
	DefaultButton int
	// CancelButton is the index of the button activated with Escape. When
	// zero, the first button labeled "Cancel" or "No" is used.
	CancelButton    int
	CheckboxLabel   string
	CheckboxChecked bool
}

MessageOptions configures Dialog.Message.

type MessageResult 

type MessageResult struct {
	// Button is the index of the clicked button.
	Button int
	// CheckboxChecked is the final state of the checkbox.
	CheckboxChecked bool
}

MessageResult is the outcome of Dialog.Message.

type MessageType 

type MessageType string

MessageType selects the icon of a message dialog. 

const (
	MessageNone     MessageType = "none"
	MessageInfo     MessageType = "info"
	MessageWarning  MessageType = "warning"
	MessageError    MessageType = "error"
	MessageQuestion MessageType = "question"
)

Message dialog types. 

type NavigateEvent struct {
	Preventable
	URL string
	// UserInitiated is true when the navigation was triggered by a user
	// gesture such as clicking a link.
	UserInitiated bool
}

NavigateEvent is passed to Window.OnWillNavigate listeners. Preventing it cancels the navigation.

type Notification 

type Notification struct {
	// contains filtered or unexported fields
}

Notification is a desktop notification.

func NewNotification 

func NewNotification(opts NotificationOptions) *Notification

NewNotification creates a notification; call Show to display it.

func (*Notification) Close 

func (n *Notification) Close()

Close removes the notification.

func (*Notification) OnClick 

func (n *Notification) OnClick(fn func()) (off func())

OnClick is called when the user clicks the notification.

func (*Notification) Show 

func (n *Notification) Show() error

Show displays the notification.

type NotificationOptions 

type NotificationOptions struct {
	Title    string
	Subtitle string
	Body     string
	// Silent suppresses the notification sound.
	Silent bool
}

NotificationOptions configures a desktop notification.

type OpenDialogOptions 

type OpenDialogOptions struct {
	// Parent attaches the dialog to a window (a sheet on macOS).
	Parent      *Window
	Title       string
	DefaultPath string
	// ButtonLabel replaces the label of the confirm button.
	ButtonLabel string
	// Message is shown above the file list (macOS).
	Message string
	Filters []FileFilter
	// Directory selects directories instead of files.
	Directory bool
	// Multiple allows selecting several entries.
	Multiple        bool
	ShowHiddenFiles bool
	// CreateDirectories shows a "New Folder" button (macOS).
	CreateDirectories bool
	// TreatPackagesAsDirectories lets the user browse into packages such as
	// .app bundles (macOS).
	TreatPackagesAsDirectories bool
}

OpenDialogOptions configures Dialog.Open.

type PDFOptions 

type PDFOptions struct {
	// PageSize is the size of the paper; the zero value is PageLetter.
	PageSize  PageSize
	Landscape bool
	// Margins surround the content of every page; nil means 0.4 inch on
	// every side, &Margins{} none.
	Margins *Margins
	// Background prints background colors and images, which printing
	// leaves out by default.
	Background bool
}

PDFOptions configures Window.PrintToPDF. The zero value prints Letter pages in portrait orientation with margins of 0.4 inch and without backgrounds, like a browser's print dialog.

type PageSize 

type PageSize struct{ Width, Height float64 }

PageSize is the size of a sheet of paper in inches, in portrait orientation.

type PathName 

type PathName string

PathName names a well known directory for Application.Path. 

const (
	PathHome PathName = "home"
	// PathAppData is the per-user application data directory:
	// ~/Library/Application Support, $XDG_CONFIG_HOME or %AppData%.
	PathAppData PathName = "appData"
	// PathUserData is PathAppData joined with the application name. It is
	// created on first use.
	PathUserData PathName = "userData"
	// PathCache is the per-user cache directory of this application. It is
	// created on first use.
	PathCache PathName = "cache"
	// PathLogs is where the application should write logs. It is created on
	// first use.
	PathLogs PathName = "logs"
	// PathResources is the directory of the files the app ships with: the
	// contents of the project's resources directory, with those of its
	// directories for the app's platform (such as resources/darwin-arm64)
	// merged in, and the resources listed in mygo.config.ts, which
	// `mygo dev` and `mygo build` copy there. It is Contents/Resources in a
	// macOS app bundle and the executable's directory elsewhere. Under
	// `go run` and `go test`, whose executables are temporary, it is the
	// resources directory in the working directory, as it is.
	PathResources PathName = "resources"
	PathTemp      PathName = "temp"
	PathExe       PathName = "exe"
	PathDesktop   PathName = "desktop"
	PathDocuments PathName = "documents"
	PathDownloads PathName = "downloads"
	PathMusic     PathName = "music"
	PathPictures  PathName = "pictures"
	PathVideos    PathName = "videos"
)

Well known directories.

type Permission 

type Permission string

Permission is something a page asks the user for. 

const (
	PermissionCamera        Permission = "camera"
	PermissionMicrophone    Permission = "microphone"
	PermissionGeolocation   Permission = "geolocation"
	PermissionNotifications Permission = "notifications"
)

Permissions.

type PermissionRequest 

type PermissionRequest struct {
	// Permissions asked for together, such as the camera and the
	// microphone of a video call.
	Permissions []Permission
	// Origin of the page asking, e.g. "https://example.com".
	Origin string
}

PermissionRequest is passed to the permission handler of a window.

type Plugin added in v0.1.8 

type Plugin struct {
	// Name identifies the plugin: lowercase letters, digits and hyphens,
	// starting with a letter, e.g. "fetch". "mygo" is reserved.
	Name string
	// Service is bound as "plugin:<Name>", when not nil.
	Service any
	// Setup runs once, when Use is called with the plugin, to add
	// listeners, protocols and the like. An error makes Use panic.
	Setup func() error
}

Plugin adds a feature to an app in two halves: Go services, and a JavaScript package whose pages call them. The official plugins live in the repository's plugins directory, such as fetch, whose npm package @mygo-plugins/fetch gives pages a fetch that runs in Go: 

mygo.Use(fetch.Plugin, websocket.Plugin)

A plugin's services are bound like those of Bind, with the same rules for their methods, but under the name "plugin:<Name>" and outside the generated TypeScript client: its JavaScript package calls them with call of mygo-runtime, as in `call("plugin:fetch.Fetch", ...)`. Only trusted pages may call them, like every bound method.

type Point 

type Point struct{ X, Y int }

Point is a position in screen coordinates.

type PowerModule 

type PowerModule struct {
	// contains filtered or unexported fields
}

PowerModule reports power and session changes and keeps the computer awake. Use the Power singleton.

func (*PowerModule) IdleTime 

func (p *PowerModule) IdleTime() time.Duration

IdleTime returns how long the user has not used the keyboard or mouse, or 0 when the system does not tell (some Linux desktops).

func (*PowerModule) IsOnBattery 

func (p *PowerModule) IsOnBattery() bool

IsOnBattery reports whether the computer runs on battery power.

func (*PowerModule) KeepAwake 

func (p *PowerModule) KeepAwake(reason string, display bool) (release func())

KeepAwake keeps the computer from sleeping while idle, and with display the display from turning off, e.g. during a long task or while a video plays, until release is called: 

release := mygo.Power.KeepAwake("Exporting the video", false)
defer release()

The reason shows where the system lists what keeps it awake.

func (*PowerModule) OnLockScreen 

func (p *PowerModule) OnLockScreen(fn func()) (off func())

OnLockScreen is called when the screen locks (on Linux, when the screen saver starts, which usually locks it).

func (*PowerModule) OnResume 

func (p *PowerModule) OnResume(fn func()) (off func())

OnResume is called when the system woke up.

func (*PowerModule) OnSuspend 

func (p *PowerModule) OnSuspend(fn func()) (off func())

OnSuspend is called when the system is about to sleep.

func (*PowerModule) OnUnlockScreen 

func (p *PowerModule) OnUnlockScreen(fn func()) (off func())

OnUnlockScreen is called when the screen unlocks.

type Preventable 

type Preventable struct {
	// contains filtered or unexported fields
}

Preventable is embedded in events whose default action listeners can cancel.

func (*Preventable) DefaultPrevented 

func (p *Preventable) DefaultPrevented() bool

DefaultPrevented reports whether PreventDefault was called.

func (*Preventable) PreventDefault 

func (p *Preventable) PreventDefault()

PreventDefault cancels the default action of the event.

type ProgressBar 

type ProgressBar struct {
	// State defaults to ProgressNormal when Value is above 0, else to
	// ProgressNone.
	State ProgressState
	// Value is the fraction done, between 0 and 1.
	Value float64
}

ProgressBar is the progress of a task, shown on the window's taskbar button (Windows), on the application's Dock icon (macOS) or on its launcher entry (Linux docks that implement the Unity launcher API, such as KDE Plasma's and Ubuntu's). The zero value shows no progress.

type ProgressState 

type ProgressState string

ProgressState is the state of a progress bar; see ProgressBar. 

const (
	ProgressNone          ProgressState = ""
	ProgressNormal        ProgressState = "normal"
	ProgressIndeterminate ProgressState = "indeterminate"
	// ProgressPaused and ProgressError color the bar yellow and red on
	// Windows, and show it like ProgressNormal elsewhere.
	ProgressPaused ProgressState = "paused"
	ProgressError  ProgressState = "error"
)

Progress states.

type ProtocolModule 

type ProtocolModule struct {
	// contains filtered or unexported fields
}

ProtocolModule registers custom URL schemes served by Go.

func (*ProtocolModule) Handle 

func (p *ProtocolModule) Handle(scheme string, handler http.Handler) error

Handle serves requests for scheme with an http.Handler, for example files generated at run time: 

mygo.Protocol.Handle("thumbs", mygo.FileServer(os.DirFS(cacheDir)))
win.LoadURL("thumbs://localhost/")

Pages served this way are loaded like regular web pages: they can use fetch, ES modules and relative URLs. Schemes must be registered before the windows that use them are created. Handlers run on their own goroutines and responses are streamed to the page.

The mygo scheme serves the app's frontend (see SetFrontend) unless it is handled here.

func (*ProtocolModule) HandleFunc 

func (p *ProtocolModule) HandleFunc(scheme string, fn func(http.ResponseWriter, *http.Request)) error

HandleFunc is Handle for a handler function.

func (*ProtocolModule) IsHandled 

func (p *ProtocolModule) IsHandled(scheme string) bool

IsHandled reports whether scheme has a handler.

func (*ProtocolModule) Unhandle 

func (p *ProtocolModule) Unhandle(scheme string)

Unhandle removes the handler of scheme. Pages requesting it get an error.

type QuitEvent 

type QuitEvent struct {
	Preventable
}

QuitEvent is passed to Application.OnBeforeQuit and OnWillQuit listeners. Preventing it cancels the quit.

type Rectangle 

type Rectangle struct{ X, Y, Width, Height int }

Rectangle is a position and size in screen coordinates (DIPs, origin at the top-left corner of the primary display).

type SaveDialogOptions 

type SaveDialogOptions struct {
	Parent      *Window
	Title       string
	DefaultPath string
	ButtonLabel string
	Message     string
	// NameFieldLabel replaces the label in front of the file name field
	// (macOS).
	NameFieldLabel             string
	Filters                    []FileFilter
	ShowHiddenFiles            bool
	CreateDirectories          bool
	TreatPackagesAsDirectories bool
}

SaveDialogOptions configures Dialog.Save.

type ScreenModule 

type ScreenModule struct {
	// contains filtered or unexported fields
}

ScreenModule queries displays.

func (*ScreenModule) CursorScreenPoint 

func (s *ScreenModule) CursorScreenPoint() Point

CursorScreenPoint returns the mouse position in screen coordinates.

func (*ScreenModule) DisplayMatching 

func (s *ScreenModule) DisplayMatching(r Rectangle) Display

DisplayMatching returns the display that overlaps r the most.

func (*ScreenModule) DisplayNearestPoint 

func (s *ScreenModule) DisplayNearestPoint(p Point) Display

DisplayNearestPoint returns the display closest to p.

func (*ScreenModule) Displays 

func (s *ScreenModule) Displays() []Display

Displays returns all displays; the primary one comes first.

func (*ScreenModule) OnDisplaysChanged 

func (s *ScreenModule) OnDisplaysChanged(fn func()) (off func())

OnDisplaysChanged is called when displays are added, removed or change resolution.

func (*ScreenModule) PrimaryDisplay 

func (s *ScreenModule) PrimaryDisplay() Display

PrimaryDisplay returns the display with the menu bar or taskbar.

type ShellModule 

type ShellModule struct{}

ShellModule integrates with the desktop environment. 

var Shell ShellModule

Shell opens URLs and files with the default applications.

func (ShellModule) Beep 

func (ShellModule) Beep()

Beep plays the system alert sound.

func (ShellModule) OpenExternal 

func (ShellModule) OpenExternal(url string) error

OpenExternal opens a URL with the default application, e.g. a web page in the default browser.

func (ShellModule) OpenPath 

func (ShellModule) OpenPath(path string) error

OpenPath opens a file or directory with the default application.

func (ShellModule) ShowItemInFolder 

func (ShellModule) ShowItemInFolder(path string)

ShowItemInFolder reveals a file in the file manager.

func (ShellModule) TrashItem 

func (ShellModule) TrashItem(path string) error

TrashItem moves a file or directory to the trash.

type Size 

type Size struct{ Width, Height int }

Size is a width and height in DIPs.

type ThemeModule 

type ThemeModule struct {
	// contains filtered or unexported fields
}

ThemeModule reads and overrides the light/dark appearance.

func (*ThemeModule) IsDark 

func (t *ThemeModule) IsDark() bool

IsDark reports whether the app currently uses a dark appearance.

func (*ThemeModule) OnUpdated 

func (t *ThemeModule) OnUpdated(fn func()) (off func())

OnUpdated is called when the effective appearance changes.

func (*ThemeModule) SetSource 

func (t *ThemeModule) SetSource(s ThemeSource)

SetSource forces a light or dark appearance, or follows the system. It may be called before App.Run, e.g. with a saved preference, to start the app in that appearance.

func (*ThemeModule) Source 

func (t *ThemeModule) Source() ThemeSource

Source returns the appearance override.

type ThemeSource 

type ThemeSource string

ThemeSource selects the appearance of the app. 

const (
	ThemeSystem ThemeSource = "system"
	ThemeLight  ThemeSource = "light"
	ThemeDark   ThemeSource = "dark"
)

Theme sources.

type TitleBarStyle 

type TitleBarStyle string

TitleBarStyle selects how the title bar of a framed window looks (macOS). 

const (
	TitleBarDefault TitleBarStyle = "default"
	// TitleBarHidden extends the page under a transparent title bar while
	// keeping the window controls.
	TitleBarHidden TitleBarStyle = "hidden"
	// TitleBarHiddenInset is TitleBarHidden with the window controls inset
	// further from the edges.
	TitleBarHiddenInset TitleBarStyle = "hiddenInset"
)

Title bar styles.

type TitleEvent 

type TitleEvent struct {
	Preventable
	Title string
}

TitleEvent is passed to Window.OnPageTitleUpdated listeners. Preventing it keeps the native window title unchanged.

type Tray 

type Tray struct {
	// contains filtered or unexported fields
}

Tray is an icon in the menu bar (macOS) or notification area.

func NewTray 

func NewTray(opts TrayOptions) (*Tray, error)

NewTray adds an icon to the menu bar or notification area. It must be called after the application is ready.

func (*Tray) Bounds 

func (t *Tray) Bounds() Rectangle

Bounds returns the position of the icon on screen.

func (*Tray) Destroy 

func (t *Tray) Destroy()

Destroy removes the icon.

func (*Tray) OnClick 

func (t *Tray) OnClick(fn func()) (off func())

OnClick is called when the icon is clicked and it has no menu.

func (*Tray) OnRightClick 

func (t *Tray) OnRightClick(fn func()) (off func())

OnRightClick is called when the icon is right-clicked.

func (*Tray) PopUpMenu 

func (t *Tray) PopUpMenu()

PopUpMenu shows the tray menu programmatically.

func (*Tray) SetIcon 

func (t *Tray) SetIcon(png []byte, template bool) error

SetIcon replaces the icon with a PNG image.

func (*Tray) SetMenu 

func (t *Tray) SetMenu(m *Menu)

SetMenu sets the menu shown when the icon is clicked; nil removes it so clicks reach OnClick.

func (*Tray) SetTitle 

func (t *Tray) SetTitle(title string)

SetTitle sets the text next to the icon (macOS).

func (*Tray) SetToolTip 

func (t *Tray) SetToolTip(tip string)

SetToolTip sets the hover text.

type TrayOptions 

type TrayOptions struct {
	// Icon is a PNG image, ideally 16x16 points (32x32 pixels for Retina).
	Icon []byte
	// IconIsTemplate lets macOS tint a black-and-transparent icon to match
	// the menu bar.
	IconIsTemplate bool
	// Title is shown next to the icon (macOS).
	Title   string
	ToolTip string
	// Menu is shown when the icon is clicked.
	Menu *Menu
}

TrayOptions configures NewTray.

type Update 

type Update struct {
	// Version of the update, and its release notes in Markdown.
	Version string
	Notes   string
	// Date is when the update was built.
	Date time.Time
	// contains filtered or unexported fields
}

Update is a newer version of the app, found by Updater.Check.

func (*Update) Install 

func (up *Update) Install(ctx context.Context, progress func(downloaded, total int64)) error

Install downloads the update, checks that it is signed with the app's key and replaces the app with it; progress, when not nil, is called with the bytes downloaded so far. The running app is not affected: the new version runs after App.Relaunch, or at the next launch.

The app must be able to write where it is installed: a bundle in /Applications of an administrator, or an app directory the user owns on Linux and Windows. Apps installed by a package manager are updated by it.

type UpdaterModule 

type UpdaterModule struct{}

UpdaterModule installs new versions of the app, which `mygo build` publishes when mygo.config.ts configures updates: signed archives and a manifest per platform. Use the Updater singleton: 

update, err := mygo.Updater.Check(ctx)
if err == nil && update != nil {
	if err := update.Install(ctx, nil); err == nil {
		mygo.App.Relaunch()
	}
}

func (*UpdaterModule) Check 

func (u *UpdaterModule) Check(ctx context.Context) (*Update, error)

Check asks the update feed for a version newer than the running one and returns it, or nil when the app is up to date.

func (*UpdaterModule) Enabled 

func (u *UpdaterModule) Enabled() bool

Enabled reports whether the app can update itself: it was built with updates and can write where it is installed. Apps installed by a package manager, such as a .deb in /opt, are updated by it instead.

type Vibrancy 

type Vibrancy string

Vibrancy is a translucent material that blurs what is behind a window, shown behind a transparent page (see WindowOptions.Vibrancy).

macOS has all of them (NSVisualEffectView materials). Windows 11 has the Mica, Acrylic and Tabbed system backdrops; the other materials use the closest one: Acrylic for transient UI (menus, popovers, HUDs, sheets, tooltips, selection, full-screen UI), Mica otherwise. On macOS, Mica and Tabbed use the under-window material and Acrylic the HUD one. Linux has none. 

const (
	VibrancyNone        Vibrancy = ""
	VibrancyWindow      Vibrancy = "window"
	VibrancyContent     Vibrancy = "content"
	VibrancySidebar     Vibrancy = "sidebar"
	VibrancyHeader      Vibrancy = "header"
	VibrancyTitlebar    Vibrancy = "titlebar"
	VibrancyUnderWindow Vibrancy = "under-window"
	VibrancyUnderPage   Vibrancy = "under-page"
)

Materials for window areas. 

const (
	VibrancyMenu         Vibrancy = "menu"
	VibrancyPopover      Vibrancy = "popover"
	VibrancyHUD          Vibrancy = "hud"
	VibrancySheet        Vibrancy = "sheet"
	VibrancyTooltip      Vibrancy = "tooltip"
	VibrancySelection    Vibrancy = "selection"
	VibrancyFullScreenUI Vibrancy = "fullscreen-ui"
)

Materials for transient UI. 

const (
	// VibrancyMica tints the window with the desktop wallpaper.
	VibrancyMica Vibrancy = "mica"
	// VibrancyAcrylic blurs what is behind the window.
	VibrancyAcrylic Vibrancy = "acrylic"
	// VibrancyTabbed is Mica for windows with tabs in the title bar.
	VibrancyTabbed Vibrancy = "tabbed"
)

Windows 11 system backdrops.

type Window 

type Window struct {
	// contains filtered or unexported fields
}

Window is a native window hosting a web page. Create windows with NewWindow once the application is ready.

func CallerWindow 

func CallerWindow(ctx context.Context) *Window

CallerWindow returns the window whose page called a bound method, given the context.Context passed to that method. It returns nil for other contexts.

func FocusedWindow 

func FocusedWindow() *Window

FocusedWindow returns the focused window of this application, or nil.

func NewWindow 

func NewWindow(opts WindowOptions) *Window

NewWindow creates a window. It must be called after the application is ready (see Application.WhenReady); when called from another goroutine it waits for that.

func WindowByID 

func WindowByID(id int) *Window

WindowByID returns the window with the given id, or nil.

func Windows 

func Windows() []*Window

Windows returns all open windows in creation order.

func (*Window) Blur 

func (w *Window) Blur()

Blur removes focus from the window.

func (*Window) Bounds 

func (w *Window) Bounds() Rectangle

Bounds returns the position and size of the window.

func (*Window) CanGoBack 

func (w *Window) CanGoBack() bool

CanGoBack reports whether there is a previous page in history.

func (*Window) CanGoForward 

func (w *Window) CanGoForward() bool

CanGoForward reports whether there is a next page in history.

func (*Window) CapturePage 

func (w *Window) CapturePage() ([]byte, error)

CapturePage returns a PNG screenshot of the visible page.

func (*Window) Center 

func (w *Window) Center()

Center moves the window to the center of its screen.

func (*Window) Close 

func (w *Window) Close()

Close closes the window as if the user clicked its close button, so OnClose listeners can cancel it.

func (*Window) CloseDevTools 

func (w *Window) CloseDevTools()

CloseDevTools closes the web inspector.

func (*Window) ContentBounds 

func (w *Window) ContentBounds() Rectangle

ContentBounds returns the bounds of the page area.

func (*Window) ContentSize 

func (w *Window) ContentSize() (width, height int)

ContentSize returns the size of the page area.

func (*Window) Destroy 

func (w *Window) Destroy()

Destroy closes the window without emitting OnClose.

func (*Window) Eval 

func (w *Window) Eval(code string) (any, error)

Eval evaluates JavaScript in the page and returns its result, decoded from JSON. An expression's value is returned, with promises awaited: 

title, err := win.Eval("document.title")
data, err := win.Eval("fetch('/data.json').then(r => r.json())")

Statements run as the body of an async function, so use return to produce a value: 

n, err := win.Eval("const items = document.querySelectorAll('li'); return items.length")

Eval is not subject to the page's Content Security Policy.

func (*Window) EvalContext 

func (w *Window) EvalContext(ctx context.Context, code string) (any, error)

EvalContext is Eval with a context that can abort the wait.

func (*Window) FindInPage 

func (w *Window) FindInPage(text string, opts FindOptions) (FindResult, error)

FindInPage highlights the occurrences of text in the page, scrolls to the active one and reports how many there are, like the find bar of a browser: call it as the user types, and with FindNext to go to the next match. 

res, err := win.FindInPage("mygo", mygo.FindOptions{FindNext: true})

Text split by markup, such as "my<b>go</b>", is not found.

func (*Window) FlashFrame 

func (w *Window) FlashFrame(flash bool)

FlashFrame draws the user's attention to the window, or stops doing so: its taskbar button flashes until it is focused (Windows), it is marked urgent (Linux), or the Dock icon bounces (macOS, while the app is not active).

func (*Window) Focus 

func (w *Window) Focus()

Focus focuses the window.

func (*Window) GoBack 

func (w *Window) GoBack()

GoBack navigates back in history.

func (*Window) GoForward 

func (w *Window) GoForward()

GoForward navigates forward in history.

func (*Window) HasShadow 

func (w *Window) HasShadow() bool

HasShadow reports whether the window has a shadow.

func (*Window) Hide 

func (w *Window) Hide()

Hide hides the window.

func (*Window) ID 

func (w *Window) ID() int

ID returns the unique id of the window. The page sees it as window.mygo.windowId.

func (*Window) IsAlwaysOnTop 

func (w *Window) IsAlwaysOnTop() bool

IsAlwaysOnTop reports whether the window stays above other windows.

func (*Window) IsClosable 

func (w *Window) IsClosable() bool

IsClosable reports whether the user can close the window.

func (*Window) IsDestroyed 

func (w *Window) IsDestroyed() bool

IsDestroyed reports whether the window has been closed.

func (*Window) IsDevToolsOpened 

func (w *Window) IsDevToolsOpened() bool

IsDevToolsOpened reports whether the web inspector is open.

func (*Window) IsFocused 

func (w *Window) IsFocused() bool

IsFocused reports whether the window has keyboard focus.

func (*Window) IsFullScreen 

func (w *Window) IsFullScreen() bool

IsFullScreen reports whether the window is in full screen.

func (*Window) IsLoading 

func (w *Window) IsLoading() bool

IsLoading reports whether the page is still loading.

func (*Window) IsMaximizable 

func (w *Window) IsMaximizable() bool

IsMaximizable reports whether the window can be maximized.

func (*Window) IsMaximized 

func (w *Window) IsMaximized() bool

IsMaximized reports whether the window is maximized.

func (*Window) IsMinimizable 

func (w *Window) IsMinimizable() bool

IsMinimizable reports whether the window can be minimized.

func (*Window) IsMinimized 

func (w *Window) IsMinimized() bool

IsMinimized reports whether the window is minimized.

func (*Window) IsMovable 

func (w *Window) IsMovable() bool

IsMovable reports whether the user can move the window.

func (*Window) IsResizable 

func (w *Window) IsResizable() bool

IsResizable reports whether the user can resize the window.

func (*Window) IsVisible 

func (w *Window) IsVisible() bool

IsVisible reports whether the window is shown.

func (*Window) LoadFile 

func (w *Window) LoadFile(path string) error

LoadFile loads a local HTML file. Relative paths are resolved against the working directory, then against the directory of the executable (and the Resources directory of a macOS app bundle).

func (*Window) LoadHTML 

func (w *Window) LoadHTML(html, baseURL string)

LoadHTML loads an HTML string. Relative URLs in it resolve against baseURL, which may be empty.

func (*Window) LoadURL 

func (w *Window) LoadURL(rawURL string) error

LoadURL navigates the page to url. A URL without a scheme, such as "/" or "/settings?tab=1", is a page of the app's frontend: the dev server at devUrl during `mygo dev`, the frontend built into the app otherwise (see SetFrontend). Besides http(s) URLs, schemes registered with Protocol.Handle can be used.

func (*Window) Maximize 

func (w *Window) Maximize()

Maximize maximizes the window.

func (*Window) Minimize 

func (w *Window) Minimize()

Minimize minimizes the window.

func (*Window) NativeHandle 

func (w *Window) NativeHandle() uintptr

NativeHandle returns the native window: NSWindow* on macOS, GtkWindow* on Linux and HWND on Windows.

func (*Window) OnBlur 

func (w *Window) OnBlur(fn func()) (off func())

OnBlur is called when the window loses focus.

func (*Window) OnClose 

func (w *Window) OnClose(fn func(e *CloseEvent)) (off func())

OnClose is called when the window is about to close. Call e.PreventDefault to keep it open.

func (*Window) OnClosed 

func (w *Window) OnClosed(fn func()) (off func())

OnClosed is called after the window has been closed.

func (*Window) OnDOMReady 

func (w *Window) OnDOMReady(fn func()) (off func())

OnDOMReady is called when the page's DOM is ready (DOMContentLoaded).

func (*Window) OnDidFailLoad 

func (w *Window) OnDidFailLoad(fn func(err *LoadError)) (off func())

OnDidFailLoad is called when the page failed to load.

func (*Window) OnDidFinishLoad 

func (w *Window) OnDidFinishLoad(fn func()) (off func())

OnDidFinishLoad is called when the page finished loading.

func (*Window) OnDidNavigate 

func (w *Window) OnDidNavigate(fn func(url string)) (off func())

OnDidNavigate is called when a navigation committed and a new page started.

func (*Window) OnDownloadDone 

func (w *Window) OnDownloadDone(fn func(d *Download)) (off func())

OnDownloadDone is called when a download ended.

func (*Window) OnEnterFullScreen 

func (w *Window) OnEnterFullScreen(fn func()) (off func())

OnEnterFullScreen is called when the window entered full screen.

func (*Window) OnFileDrop 

func (w *Window) OnFileDrop(fn func(e *FileDropEvent)) (off func())

OnFileDrop is called when files, for example from Finder or Explorer, are dropped on the page, with their paths. The app's own pages also get them, through onFileDrop of mygo-runtime.

The page's own drag and drop keeps working: drop events still reach it with the File objects, and drags that start in the page are left alone. Only where the page does not handle dragged files are they accepted, so that dropping them there reaches OnFileDrop instead of replacing the page with the file.

func (*Window) OnFocus 

func (w *Window) OnFocus(fn func()) (off func())

OnFocus is called when the window gains focus.

func (*Window) OnHide 

func (w *Window) OnHide(fn func()) (off func())

OnHide is called when the window is hidden.

func (*Window) OnLeaveFullScreen 

func (w *Window) OnLeaveFullScreen(fn func()) (off func())

OnLeaveFullScreen is called when the window left full screen.

func (*Window) OnMaximize 

func (w *Window) OnMaximize(fn func()) (off func())

OnMaximize is called when the window is maximized.

func (*Window) OnMinimize 

func (w *Window) OnMinimize(fn func()) (off func())

OnMinimize is called when the window is minimized.

func (*Window) OnMove 

func (w *Window) OnMove(fn func()) (off func())

OnMove is called after the window was moved.

func (*Window) OnPageTitleUpdated 

func (w *Window) OnPageTitleUpdated(fn func(e *TitleEvent)) (off func())

OnPageTitleUpdated is called when the page's <title> changes. Preventing the event keeps the native window title.

func (*Window) OnReadyToShow 

func (w *Window) OnReadyToShow(fn func()) (off func())

OnReadyToShow is called once, when the first page is ready to be displayed. Create the window with Hidden and call Show here to avoid a visual flash.

func (*Window) OnRenderProcessGone 

func (w *Window) OnRenderProcessGone(fn func(reason string)) (off func())

OnRenderProcessGone is called when the web content process crashed or was killed. Call Reload to recover.

func (*Window) OnResize 

func (w *Window) OnResize(fn func()) (off func())

OnResize is called after the window was resized.

func (*Window) OnRestore 

func (w *Window) OnRestore(fn func()) (off func())

OnRestore is called when the window is restored from minimized.

func (*Window) OnShow 

func (w *Window) OnShow(fn func()) (off func())

OnShow is called when the window is shown.

func (*Window) OnUnmaximize 

func (w *Window) OnUnmaximize(fn func()) (off func())

OnUnmaximize is called when the window leaves the maximized state.

func (*Window) OnWillDownload 

func (w *Window) OnWillDownload(fn func(e *DownloadEvent)) (off func())

OnWillDownload is called when a page starts a download: a link with the download attribute, or a response the page cannot show, such as a file sent as an attachment. Without listeners, downloads are saved to the Downloads directory.

func (*Window) OnWillNavigate 

func (w *Window) OnWillNavigate(fn func(e *NavigateEvent)) (off func())

OnWillNavigate is called before the page navigates to another URL, for example after a link click. Preventing the event cancels the navigation. It is not called for LoadURL and friends.

func (*Window) Opacity 

func (w *Window) Opacity() float64

Opacity returns the window opacity.

func (*Window) OpenDevTools 

func (w *Window) OpenDevTools()

OpenDevTools opens the web inspector (unless disabled with WindowOptions.DevTools).

func (*Window) Parent 

func (w *Window) Parent() *Window

Parent returns the parent window, or nil.

func (*Window) Position 

func (w *Window) Position() (x, y int)

Position returns the window's top-left corner.

func (*Window) Print 

func (w *Window) Print()

Print opens the print dialog for the page.

func (*Window) PrintToPDF 

func (w *Window) PrintToPDF(opts PDFOptions) ([]byte, error)

PrintToPDF renders the page as a PDF document, laid out for printing (the page's print style sheets apply) on pages of the given size: 

pdf, err := win.PrintToPDF(mygo.PDFOptions{PageSize: mygo.PageA4, Background: true})

func (*Window) Reload 

func (w *Window) Reload()

Reload reloads the page.

func (*Window) ReloadIgnoringCache 

func (w *Window) ReloadIgnoringCache()

ReloadIgnoringCache reloads the page bypassing the cache.

func (*Window) Restore 

func (w *Window) Restore()

Restore restores a minimized window.

func (*Window) SetAlwaysOnTop 

func (w *Window) SetAlwaysOnTop(v bool)

SetAlwaysOnTop keeps the window above other windows.

func (*Window) SetAutoHideMenuBar added in v0.1.10 

func (w *Window) SetAutoHideMenuBar(v bool)

SetAutoHideMenuBar keeps the menu bar of this window out of sight until the user presses Alt or F10, or shows it for good again (Linux, Windows). See WindowOptions.AutoHideMenuBar.

func (*Window) SetBackgroundColor 

func (w *Window) SetBackgroundColor(color string) error

SetBackgroundColor sets the color shown behind the page, in the syntax of WindowOptions.BackgroundColor.

func (*Window) SetBounds 

func (w *Window) SetBounds(r Rectangle)

SetBounds moves and resizes the window.

func (*Window) SetClosable 

func (w *Window) SetClosable(v bool)

SetClosable sets whether the user can close the window.

func (*Window) SetContentBounds 

func (w *Window) SetContentBounds(r Rectangle)

SetContentBounds moves and resizes the window so the page area has the given bounds.

func (*Window) SetContentProtection 

func (w *Window) SetContentProtection(v bool)

SetContentProtection keeps the window content out of screenshots and screen recordings.

func (*Window) SetContentSize 

func (w *Window) SetContentSize(width, height int)

SetContentSize resizes the window so the page area has the given size.

func (*Window) SetFullScreen 

func (w *Window) SetFullScreen(v bool)

SetFullScreen enters or leaves full screen.

func (*Window) SetHasShadow 

func (w *Window) SetHasShadow(v bool)

SetHasShadow sets whether the window has a shadow.

func (*Window) SetIcon 

func (w *Window) SetIcon(png []byte) error

SetIcon sets the icon of the window, shown in its title bar and taskbar button (Linux, Windows), from a PNG image; nil restores the application icon. macOS windows show no icon of their own.

func (*Window) SetIgnoreMouseEvents 

func (w *Window) SetIgnoreMouseEvents(v bool)

SetIgnoreMouseEvents makes the window transparent to mouse events.

func (*Window) SetMaximizable 

func (w *Window) SetMaximizable(v bool)

SetMaximizable sets whether the window can be maximized.

func (*Window) SetMaximumSize 

func (w *Window) SetMaximumSize(width, height int)

SetMaximumSize limits how large the window can be resized; 0 means no limit.

func (*Window) SetMenu 

func (w *Window) SetMenu(m *Menu)

SetMenu sets the menu bar of this window (Linux, Windows). On macOS the menu bar belongs to the application; see Application.SetMenu.

func (*Window) SetMinimizable 

func (w *Window) SetMinimizable(v bool)

SetMinimizable sets whether the window can be minimized.

func (*Window) SetMinimumSize 

func (w *Window) SetMinimumSize(width, height int)

SetMinimumSize limits how small the window can be resized; 0 means no limit.

func (*Window) SetMovable 

func (w *Window) SetMovable(v bool)

SetMovable sets whether the user can move the window.

func (*Window) SetOpacity 

func (w *Window) SetOpacity(v float64)

SetOpacity sets the window opacity between 0 and 1.

func (*Window) SetPermissionHandler 

func (w *Window) SetPermissionHandler(fn func(req PermissionRequest) bool)

SetPermissionHandler decides what the pages of the window may use, such as the camera: fn returns whether to grant a request, and runs on the main thread. nil restores the default: the app's own pages (see WindowOptions.TrustedOrigins) get what they ask for, other pages do not.

The operating system may still ask the user, like macOS does once per app for the camera and the microphone. That needs usage descriptions in macos.infoPlist of mygo.config.ts (NSCameraUsageDescription, NSMicrophoneUsageDescription), without which macOS ends the app.

func (*Window) SetPosition 

func (w *Window) SetPosition(x, y int)

SetPosition moves the window's top-left corner.

func (*Window) SetProgressBar 

func (w *Window) SetProgressBar(p ProgressBar)

SetProgressBar shows the progress of a task: 

win.SetProgressBar(mygo.ProgressBar{Value: done / total})
win.SetProgressBar(mygo.ProgressBar{}) // done: remove it

On macOS and Linux the progress belongs to the application: the window that set it last wins.

func (*Window) SetResizable 

func (w *Window) SetResizable(v bool)

SetResizable sets whether the user can resize the window.

func (*Window) SetSize 

func (w *Window) SetSize(width, height int)

SetSize resizes the window.

func (*Window) SetSkipTaskbar 

func (w *Window) SetSkipTaskbar(v bool)

SetSkipTaskbar hides the window from the taskbar, or shows it there again (Linux, Windows). See WindowOptions.SkipTaskbar.

func (*Window) SetTitle 

func (w *Window) SetTitle(title string)

SetTitle sets the native window title.

func (*Window) SetUserAgent 

func (w *Window) SetUserAgent(ua string)

SetUserAgent overrides the user agent for subsequent requests.

func (*Window) SetVibrancy 

func (w *Window) SetVibrancy(v Vibrancy)

SetVibrancy sets the material behind the page; VibrancyNone removes it. See WindowOptions.Vibrancy.

func (*Window) SetVisibleOnAllWorkspaces 

func (w *Window) SetVisibleOnAllWorkspaces(v bool)

SetVisibleOnAllWorkspaces shows the window on every workspace (macOS Spaces, Linux virtual desktops), or on the current one only.

func (*Window) SetWindowOpenHandler 

func (w *Window) SetWindowOpenHandler(fn func(req WindowOpenRequest) *WindowOptions)

SetWindowOpenHandler decides what happens on window.open() and clicks on target="_blank" links. The handler returns the options of the window to open, or nil to deny the request. Without a handler, http(s) URLs open in the default browser and everything else is denied.

On macOS the new page keeps its relation to the opener (window.opener). On Linux it opens as an independent page, because WebKitGTK would share the opener's script message routing with a related page.

func (*Window) SetZoomFactor 

func (w *Window) SetZoomFactor(f float64)

SetZoomFactor zooms the page; 1 is 100%.

func (*Window) Show 

func (w *Window) Show()

Show shows and focuses the window.

func (*Window) ShowInactive 

func (w *Window) ShowInactive()

ShowInactive shows the window without focusing it.

func (*Window) Size 

func (w *Window) Size() (width, height int)

Size returns the size of the window.

func (*Window) Stop 

func (w *Window) Stop()

Stop stops loading the page.

func (*Window) StopFindInPage 

func (w *Window) StopFindInPage()

StopFindInPage removes the highlights of FindInPage.

func (*Window) Title 

func (w *Window) Title() string

Title returns the native window title.

func (*Window) ToggleDevTools 

func (w *Window) ToggleDevTools()

ToggleDevTools opens or closes the web inspector.

func (*Window) ToggleFullScreen 

func (w *Window) ToggleFullScreen()

ToggleFullScreen enters full screen or leaves it.

func (*Window) ToggleMaximize 

func (w *Window) ToggleMaximize()

ToggleMaximize maximizes the window or restores it if it is maximized.

func (*Window) URL 

func (w *Window) URL() string

URL returns the URL of the current page.

func (*Window) Unmaximize 

func (w *Window) Unmaximize()

Unmaximize restores a maximized window.

func (*Window) UserAgent 

func (w *Window) UserAgent() string

UserAgent returns the user agent of the page.

func (*Window) ZoomFactor 

func (w *Window) ZoomFactor() float64

ZoomFactor returns the page zoom; 1 is 100%.

type WindowOpenRequest 

type WindowOpenRequest struct {
	URL       string
	FrameName string
	// Width and Height requested through window.open() features; 0 when
	// not specified.
	Width, Height int
}

WindowOpenRequest describes a window.open() call or a click on a target="_blank" link.

type WindowOptions 

type WindowOptions struct {
	// Title of the window. Defaults to the application name. The title
	// follows the page's <title> unless an OnPageTitleUpdated listener
	// prevents it.
	Title string
	// URL is loaded right after the window is created. "/" and other URLs
	// without a scheme are pages of the app's frontend (see LoadURL).
	URL string

	// Width and Height of the window in DIPs (default 800x600).
	Width, Height int
	// UseContentSize makes Width and Height describe the page area instead
	// of the whole window.
	UseContentSize bool
	// X and Y of the top-left corner. The window is centered when both are
	// zero.
	X, Y                int
	MinWidth, MinHeight int
	MaxWidth, MaxHeight int

	// Hidden creates the window without showing it. Call Show, typically
	// from OnReadyToShow, to avoid a blank window while the page loads.
	Hidden bool
	// Frameless removes the title bar and window chrome. Mark draggable
	// areas with the CSS `--app-region: drag`.
	Frameless bool
	// TitleBarStyle hides the title bar but keeps the window controls
	// (macOS).
	TitleBarStyle TitleBarStyle
	// TrafficLightPosition moves the window controls of a window with a
	// hidden title bar (macOS): the top-left corner of the close button
	// goes this far from the top-left corner of the window.
	TrafficLightPosition *Point

	DisableResize     bool
	DisableMove       bool
	DisableMinimize   bool
	DisableMaximize   bool
	DisableClose      bool
	DisableFullScreen bool
	DisableShadow     bool
	AlwaysOnTop       bool
	FullScreen        bool
	// Maximized creates the window maximized.
	Maximized bool
	// SkipTaskbar hides the window from the taskbar (Linux, Windows).
	SkipTaskbar bool
	// AutoHideMenuBar keeps the window's menu bar out of sight until the
	// user presses Alt or F10, and hides it again once they leave it
	// (Linux, Windows). Its keyboard shortcuts work all along.
	AutoHideMenuBar bool
	// Transparent makes the window background transparent, so a page with a
	// transparent background shows the desktop through.
	Transparent bool
	// BackgroundColor fills the window until the page paints, which avoids
	// a flash of another color while it loads. CSS syntax: "#1e1e1e",
	// "#rgba", "rgb(30 30 30)", or "light-dark(#f5f5f7, #1e1e1e)" for a
	// page that follows the light or dark appearance.
	BackgroundColor string
	// Vibrancy puts a translucent, blurred material behind a transparent
	// page (macOS and Windows 11), e.g. VibrancySidebar.
	Vibrancy Vibrancy
	// Opacity of the window between 0 and 1 (default 1).
	Opacity float64
	// Parent makes this window a child window that stays on top of it.
	Parent *Window
	// Modal makes a child window modal to its Parent.
	Modal bool

	// PreloadScript is JavaScript injected into every page before the
	// page's own scripts, after window.mygo is available.
	PreloadScript string
	// TrustedOrigins lists extra origins, such as "https://example.com",
	// whose pages may call bound Go methods. By default only the app's own
	// content can: custom schemes registered with Protocol, file: and
	// about: pages, and loopback dev servers during development. "*"
	// trusts every origin.
	TrustedOrigins []string
	// DevTools controls the web inspector.
	DevTools DevTools
	// ZoomFactor of the page (default 1).
	ZoomFactor float64
	// UserAgent overrides the user agent string.
	UserAgent string
	// StateKey remembers the window's position, size, and maximized and
	// full screen state under this key, in window-state.json in
	// PathUserData, which is written when the window closes and when the
	// app quits. A window created with the same key, for example at the
	// next launch, gets them back as long as it would show on a connected
	// display: they override X, Y, Width, Height, UseContentSize,
	// Maximized and FullScreen.
	StateKey string
}

WindowOptions configures NewWindow. The zero value is a visible, resizable 800x600 window centered on screen.

Source Files

View all Source files

Directories

Path Synopsis
cmd
mygo command
Command mygo is the MyGo development tool: it scaffolds projects, generates the typed TypeScript client for bound Go services, runs apps in development and builds packaged production apps.
 Command mygo is the MyGo development tool: it scaffolds projects, generates the typed TypeScript client for bound Go services, runs apps in development and builds packaged production apps.
examples
frameless command
Frameless shows a window without native chrome: the page draws its own title bar, marks it draggable with `--app-region: drag` and drives the window through the built-in window.mygo.window controls.
 Frameless shows a window without native chrome: the page draws its own title bar, marks it draggable with `--app-region: drag` and drives the window through the built-in window.mygo.window controls.
hello command
Hello is the smallest MyGo app: one window and one Go method called from the page.
 Hello is the smallest MyGo app: one window and one Go method called from the page.
native command
Native tours the desktop integration: application and context menus, a tray icon, dialogs, notifications, a global shortcut, the clipboard and dark mode.
 Native tours the desktop integration: application and context menus, a tray icon, dialogs, notifications, a global shortcut, the clipboard and dark mode.
todo command
Todo is a small but complete MyGo app: typed services and events shared with a TypeScript frontend, persistence, dialogs, menus and multiple windows kept in sync.
 Todo is a small but complete MyGo app: typed services and events shared with a TypeScript frontend, persistence, dialogs, menus and multiple windows kept in sync.
vibrancy command
Vibrancy shows a window in the style of a native macOS app: a sidebar made of a translucent material, under a hidden title bar whose traffic lights are inset over it.
 Vibrancy shows a window in the style of a native macOS app: a sidebar made of a translucent material, under a hidden title bar whose traffic lights are inset over it.
internal
accelerator
Package accelerator parses Electron style keyboard accelerators such as "CmdOrCtrl+Shift+Z" into a platform neutral representation.
 Package accelerator parses Electron style keyboard accelerators such as "CmdOrCtrl+Shift+Z" into a platform neutral representation.
bridge
Package bridge embeds the renderer runtime that MyGo injects into pages.
 Package bridge embeds the renderer runtime that MyGo injects into pages.
darwin
Package darwin implements the macOS backend (AppKit + WKWebView) in pure Go: Objective-C is driven through the runtime with purego, no cgo.
 Package darwin implements the macOS backend (AppKit + WKWebView) in pure Go: Objective-C is driven through the runtime with purego, no cgo.
fake
Package fake is an in-memory platform.Backend for testing the public API without a GUI.
 Package fake is an in-memory platform.Backend for testing the public API without a GUI.
linux
Package linux implements the Linux backend (GTK 3 + WebKitGTK) in pure Go: the libraries are loaded at run time with purego, no cgo.
 Package linux implements the Linux backend (GTK 3 + WebKitGTK) in pure Go: the libraries are loaded at run time with purego, no cgo.
platform
Package platform defines the contract between the public mygo API and the native backends (WKWebView on macOS, WebKitGTK on Linux, WebView2 on Windows).
 Package platform defines the contract between the public mygo API and the native backends (WKWebView on macOS, WebKitGTK on Linux, WebView2 on Windows).
tsgen
Package tsgen generates a typed TypeScript client for Go services bound with mygo.Bind and events declared with mygo.NewEvent.
 Package tsgen generates a typed TypeScript client for Go services bound with mygo.Bind and events declared with mygo.NewEvent.
tsgen/internal/fixture
Package fixture declares types used to test the TypeScript generator.
 Package fixture declares types used to test the TypeScript generator.
unsupported
Package unsupported is the backend for platforms without a native implementation.
 Package unsupported is the backend for platforms without a native implementation.
update
Package update holds what the updater of package mygo and `mygo build` share: the update manifest, signatures, versions and the archive format.
 Package update holds what the updater of package mygo and `mygo build` share: the update manifest, signatures, versions and the archive format.
windows
Package windows implements the MyGo backend for Windows: Win32 windows hosting WebView2, called through the syscall package (no cgo).
 Package windows implements the MyGo backend for Windows: Win32 windows hosting WebView2, called through the syscall package (no cgo).
plugins
fetch
Package fetch is the fetch plugin of MyGo: pages make HTTP requests from Go with the fetch of its JavaScript package, @mygo-plugins/fetch, which takes and returns the standard Request options and Response.
 Package fetch is the fetch plugin of MyGo: pages make HTTP requests from Go with the fetch of its JavaScript package, @mygo-plugins/fetch, which takes and returns the standard Request options and Response.
websocket
Package websocket is the WebSocket plugin of MyGo: pages open WebSocket connections from Go with the WebSocket class of its JavaScript package, @mygo-plugins/websocket, which has the API of the browser's.
 Package websocket is the WebSocket plugin of MyGo: pages open WebSocket connections from Go with the WebSocket class of its JavaScript package, @mygo-plugins/websocket, which has the API of the browser's.

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