Why Go
- Case Studies
  
  Common problems companies solve with Go
- Use Cases
  
  Stories about how and why companies use Go
- Security
  
  How Go can help keep you secure by default
Learn
Docs
- Effective Go
  
  Tips for writing clear, performant, and idiomatic Go code
- Go User Manual
  
  A complete introduction to building software with Go
- Standard library
  
  Reference documentation for Go's standard library
- Release Notes
  
  Learn what's new in each Go release
- API
  
  Reference documentation for the pkg.go.dev API
Packages
Community
- Recorded Talks
  
  Videos from prior events
- Meetups
  
  Meet other local Go developers
- Conferences
  
  Learn and network with Go developers from around the world
- Go blog
  
  The Go project's official blog.
- Go project
  
  Get help and stay informed from Go
- Get connected

bellui

package module

Go to main page

Versions in this module

v1

v1.1.2

Oct 16, 2026

v1.1.1

Oct 16, 2026

v1.1.0

Oct 16, 2026

v1.0.0

Aug 6, 2026

Changes in this version

+ const AnimationRepeatForever

+ const DefaultLetterSpacing

+ const DefaultLineHeightScale

+ const TextDirectionAuto

+ const TextDirectionLTR

+ const TextDirectionRTL

+ var AnimationEaseEmphasized AnimationCurve = animationEaseEmphasized

+ var AnimationEaseIn = animationEaseIn

+ var AnimationEaseInOut = animationEaseInOut

+ var AnimationEaseOut = animationEaseOut

+ var AnimationEaseStandard AnimationCurve = animationEaseStandard

+ var AnimationEaseStandardAccelerate AnimationCurve = animationEaseStandardAccelerate

+ var AnimationEaseStandardDecelerate AnimationCurve = animationEaseStandardDecelerate

+ var AnimationLinear = animationLinear

+ var ErrShareNotSupported = errors.New("sharing is not supported on this platform")

+ func AnnounceToScreenReader(text string, assertive bool)

+ func ClipboardHTML() (string, bool)

+ func ClipboardImage() (image.Image, bool)

+ func Do(fn func())

+ func DoAndWait(fn func())

+ func DoubleTapDelay() time.Duration

+ func IsHorizontal(orient DeviceOrientation) bool

+ func IsMainGoroutine() bool

+ func IsVertical(orient DeviceOrientation) bool

+ func LogError(reason string, err error)

+ func MeasureText(text string, size float32, style TextStyle) geo.Size

+ func MeasureTextFull(text string, fontSize float32, style TextStyle, source Resource) (geo.Size, float32)

+ func OpenURL(url *url.URL) error

+ func PrefListOr[T bool | int | float64 | string](p Preferences, key string, fallback []T) []T

+ func PrefList[T bool | int | float64 | string](p Preferences, key string) ([]T, bool)

+ func PrefOr[T PreferenceType](p Preferences, key string, fallback T) T

+ func Pref[T PreferenceType](p Preferences, key string) (T, bool)

+ func Ptr[T any](v T) *T

+ func RegisterFontFallback(res Resource)

+ func RegisterLayoutDirectionRefresh(fn func())

+ func RegisterTextMeasure(fn textMeasureFunc)

+ func RunOnMain(fn func())

+ func SendNotification(n *Notification)

+ func SendNotificationWithOptions(n *NotificationOptions) bool

+ func SetClipboardFiles(files []URI) bool

+ func SetClipboardFlavors(content ClipboardContent) bool

+ func SetClipboardHTML(html, plainFallback string) bool

+ func SetClipboardImage(img image.Image) bool

+ func SetCurrentApp(current App)

+ func SetFontFallbackRegister(fn func(Resource))

+ func SetLayoutDirection(d Direction)

+ func SetPrefList[T bool | int | float64 | string](p Preferences, key string, value []T)

+ func SetPref[T PreferenceType](p Preferences, key string, value T)

+ func ShareFile(uri URI) error

+ func ShareText(text string) error

+ func ShowAndRun(w Window)

+ type AccessibilityAnnouncer interface

+ AnnounceToScreenReader func(text string, assertive bool)

+ type Animation struct

+ AutoReverse bool

+ Curve AnimationCurve

+ Duration time.Duration

+ RepeatCount int

+ Tick func(float32)

+ func NewAnimation(d time.Duration, fn func(float32)) *Animation

+ func (a *Animation) Start()

+ func (a *Animation) Stop()

+ type AnimationCurve func(float32) float32

+ type App interface

+ Clipboard func() Clipboard

+ Driver func() Driver

+ Icon func() Resource

+ Lifecycle func() Lifecycle

+ Metadata func() AppMetadata

+ NewWindow func(title string) Window

+ Preferences func() Preferences

+ Quit func()

+ Run func()

+ SetIcon func(Resource)

+ Settings func() Settings

+ Storage func() Storage

+ UniqueID func() string

+ func CurrentApp() App

+ type AppMetadata struct

+ Build int

+ Custom map[string]string

+ ID string

+ Icon Resource

+ Migrations map[string]bool

+ Name string

+ Release bool

+ Version string

+ type BadgeApp interface

+ SetBadge func(count int)

+ type BuildType int

+ const BuildDebug

+ const BuildRelease

+ const BuildStandard

+ type Clipboard interface

+ Content func() string

+ SetContent func(content string)

+ type ClipboardContent struct

+ Files []URI

+ HTML string

+ Image image.Image

+ Text string

+ type CloudApp interface

+ CloudProvider func() CloudProvider

+ SetCloudProvider func(CloudProvider)

+ type CloudProvider interface

+ Cleanup func(App)

+ ProviderDescription func() string

+ ProviderIcon func() Resource

+ ProviderName func() string

+ Setup func(App) error

+ type CloudProviderPreferences interface

+ CloudPreferences func(App) Preferences

+ type CloudProviderStorage interface

+ CloudStorage func(App) Storage

+ type Container struct

+ ClipToBounds bool

+ Hidden bool

+ Layout core.Layout

+ Objects []core.CanvasObject

+ func (c *Container) Add(add core.CanvasObject)

+ func (c *Container) Hide()

+ func (c *Container) MinSize() geo.Size

+ func (c *Container) Move(pos geo.Position)

+ func (c *Container) Position() geo.Position

+ func (c *Container) Refresh()

+ func (c *Container) Remove(rem core.CanvasObject)

+ func (c *Container) RemoveAll()

+ func (c *Container) Resize(size geo.Size)

+ func (c *Container) Show()

+ func (c *Container) Size() geo.Size

+ func (c *Container) Visible() bool

+ type Device interface

+ HasKeyboard func() bool

+ IsBrowser func() bool

+ IsMobile func() bool

+ Locale func() Locale

+ Orientation func() DeviceOrientation

+ SystemScaleForWindow func(Window) float32

+ func CurrentDevice() Device

+ type DeviceOrientation int

+ const OrientationHorizontalLeft

+ const OrientationHorizontalRight

+ const OrientationVertical

+ const OrientationVerticalUpsideDown

+ type Direction int

+ const DirectionAuto

+ const DirectionLTR

+ const DirectionRTL

+ func CurrentLayoutDirection() Direction

+ type DoubleTapDriver interface

+ DoubleTapDelay func() time.Duration

+ type DragHoverEvent struct

+ AbsolutePosition geo.Position

+ Position geo.Position

+ type Driver interface

+ AbsolutePositionForObject func(core.CanvasObject) geo.Position

+ AllWindows func() []Window

+ CanvasForObject func(core.CanvasObject) core.Canvas

+ CreateWindow func(string) Window

+ Device func() Device

+ DoFromGoroutine func(fn func(), wait bool)

+ Quit func()

+ RenderedTextSize func(text string, fontSize float32, style TextStyle, source Resource) (size geo.Size, baseline float32)

+ Run func()

+ StartAnimation func(*Animation)

+ StopAnimation func(*Animation)

+ type DropEvent struct

+ AbsolutePosition geo.Position

+ Position geo.Position

+ URIs []URI

+ type DropHoverable interface

+ DragEnter func(*DragHoverEvent)

+ DragLeave func()

+ DragOver func(*DragHoverEvent)

+ type Droppable interface

+ Dropped func(*DropEvent)

+ type DroppableWindow interface

+ SetOnDropped func(func(geo.Position, []URI))

+ type FileClipboard interface

+ Files func() []URI

+ SetFiles func(files []URI)

+ type HTMLClipboard interface

+ HTML func() (string, bool)

+ SetHTML func(html, plainFallback string)

+ type ImageClipboard interface

+ Image func() (image.Image, bool)

+ SetImage func(img image.Image)

+ type KeyboardShortcut interface

+ Key func() event.KeyName

+ Mod func() event.KeyModifier

+ type LaunchAtLoginApp interface

+ LaunchAtLogin func() bool

+ SetLaunchAtLogin func(enabled bool) error

+ type LazyResource struct

+ func NewLazyResource(name string, loader func() ([]byte, error)) *LazyResource

+ func NewLazyResourceFromPath(path string) *LazyResource

+ func NewStreamingLazyResource(name string, loader func() ([]byte, error), ...) *LazyResource

+ func (r *LazyResource) Content() []byte

+ func (r *LazyResource) Loaded() bool

+ func (r *LazyResource) Name() string

+ func (r *LazyResource) Open() (io.ReadCloser, error)

+ func (r *LazyResource) Release()

+ type LegacyTheme interface

+ BackgroundColor func() color.Color

+ ButtonColor func() color.Color

+ DisabledButtonColor func() color.Color

+ DisabledTextColor func() color.Color

+ FocusColor func() color.Color

+ HoverColor func() color.Color

+ IconInlineSize func() int

+ Padding func() int

+ PlaceHolderColor func() color.Color

+ PrimaryColor func() color.Color

+ ScrollBarColor func() color.Color

+ ScrollBarSize func() int

+ ScrollBarSmallSize func() int

+ ShadowColor func() color.Color

+ TextBoldFont func() Resource

+ TextBoldItalicFont func() Resource

+ TextColor func() color.Color

+ TextFont func() Resource

+ TextItalicFont func() Resource

+ TextMonospaceFont func() Resource

+ TextSize func() int

+ type Lifecycle interface

+ SetOnEnteredForeground func(func())

+ SetOnExitedForeground func(func())

+ SetOnStarted func(func())

+ SetOnStopped func(func())

+ type ListableURI interface

+ List func() ([]URI, error)

+ type Locale string

+ func (l Locale) LanguageString() string

+ func (l Locale) String() string

+ type MainMenu struct

+ Items []*Menu

+ func NewMainMenu(items ...*Menu) *MainMenu

+ func (m *MainMenu) Refresh()

+ type MasterWindow interface

+ SetMaster func()

+ type Menu struct

+ Items []*MenuItem

+ Label string

+ func NewMenu(label string, items ...*MenuItem) *Menu

+ func (m *Menu) Refresh()

+ type MenuItem struct

+ Action func()

+ Checked bool

+ ChildMenu *Menu

+ Disabled bool

+ Icon Resource

+ IsQuit bool

+ IsSeparator bool

+ Label string

+ Shortcut core.Shortcut

+ func NewMenuItem(label string, action func()) *MenuItem

+ func NewMenuItemSeparator() *MenuItem

+ func NewMenuItemWithIcon(label string, icon Resource, action func()) *MenuItem

+ type MultiFlavorClipboard interface

+ SetFlavors func(content ClipboardContent)

+ type Notification struct

+ Content string

+ Title string

+ func NewNotification(title, content string) *Notification

+ type NotificationAction struct

+ Callback func()

+ Label string

+ type NotificationOptions struct

+ Actions []NotificationAction

+ Content string

+ Icon Resource

+ OnTapped func()

+ Title string

+ type NotifierApp interface

+ SendNotification func(*Notification)

+ type NotifierWithOptionsApp interface

+ SendNotificationWithOptions func(*NotificationOptions)

+ type OpenHandlerApp interface

+ SetOnFileOpened func(func(URI))

+ SetOnURLOpened func(func(*url.URL))

+ type PreferenceType interface

+ type Preferences interface

+ AddChangeListener func(func())

+ RemoveValue func(key string)

+ SetValue func(key string, value any)

+ Value func(key string) (any, bool)

+ type PrimaryColorSettings interface

+ SetPrimaryColor func(name string)

+ type Resource interface

+ Content func() []byte

+ Name func() string

+ func LoadResourceFromPath(path string) (Resource, error)

+ func LoadResourceFromURLString(urlStr string) (Resource, error)

+ type ScreenBlankingDriver interface

+ SetDisableScreenBlanking func(bool)

+ type ScrollDirection int

+ const ScrollBoth

+ const ScrollHorizontalOnly

+ const ScrollNone

+ const ScrollVerticalOnly

+ type SelectableMode int

+ const SelectableAll

+ const SelectableNone

+ const SelectablePerWidget

+ type Settings interface

+ AddListener func(func(Settings))

+ BuildType func() BuildType

+ PrimaryColor func() string

+ Scale func() float32

+ SetTheme func(Theme)

+ SetThemeVariant func(ThemeVariant)

+ ShowAnimations func() bool

+ Theme func() Theme

+ ThemeVariant func() ThemeVariant

+ type SharerApp interface

+ ShareFile func(uri URI) error

+ ShareText func(text string) error

+ type ShortcutCopy struct

+ Clipboard Clipboard

+ func (se *ShortcutCopy) Key() event.KeyName

+ func (se *ShortcutCopy) Mod() event.KeyModifier

+ func (se *ShortcutCopy) ShortcutName() string

+ type ShortcutCut struct

+ Clipboard Clipboard

+ func (se *ShortcutCut) Key() event.KeyName

+ func (se *ShortcutCut) Mod() event.KeyModifier

+ func (se *ShortcutCut) ShortcutName() string

+ type ShortcutHandler struct

+ func (sh *ShortcutHandler) AddShortcut(shortcut core.Shortcut, handler func(shortcut core.Shortcut))

+ func (sh *ShortcutHandler) RemoveShortcut(shortcut core.Shortcut)

+ func (sh *ShortcutHandler) TypedShortcut(shortcut core.Shortcut)

+ type ShortcutPaste struct

+ Clipboard Clipboard

+ func (se *ShortcutPaste) Key() event.KeyName

+ func (se *ShortcutPaste) Mod() event.KeyModifier

+ func (se *ShortcutPaste) ShortcutName() string

+ type ShortcutRedo struct

+ func (se *ShortcutRedo) Key() event.KeyName

+ func (se *ShortcutRedo) Mod() event.KeyModifier

+ func (se *ShortcutRedo) ShortcutName() string

+ type ShortcutSelectAll struct

+ func (se *ShortcutSelectAll) Key() event.KeyName

+ func (se *ShortcutSelectAll) Mod() event.KeyModifier

+ func (se *ShortcutSelectAll) ShortcutName() string

+ type ShortcutUndo struct

+ func (se *ShortcutUndo) Key() event.KeyName

+ func (se *ShortcutUndo) Mod() event.KeyModifier

+ func (se *ShortcutUndo) ShortcutName() string

+ type Shortcutable interface

+ TypedShortcut func(core.Shortcut)

+ type SingleInstanceApp interface

+ SetSingleInstance func(onOpen func(args []string)) (primary bool, err error)

+ type StaticResource struct

+ StaticContent []byte

+ StaticName string

+ func NewStaticResource(name string, content []byte) *StaticResource

+ func (r *StaticResource) Content() []byte

+ func (r *StaticResource) GoString() string

+ func (r *StaticResource) Name() string

+ type Storage interface

+ Create func(name string) (URIWriteCloser, error)

+ List func() []string

+ Open func(name string) (URIReadCloser, error)

+ Remove func(name string) error

+ RootURI func() URI

+ Save func(name string) (URIWriteCloser, error)

+ type StreamingResource interface

+ Open func() (io.ReadCloser, error)

+ type StringValidator func(string) error

+ type TextAlign int

+ const TextAlignCenter

+ const TextAlignLeading

+ const TextAlignTrailing

+ type TextDirection = Direction

+ type TextStyle struct

+ Bold bool

+ Direction TextDirection

+ Italic bool

+ Language string

+ LetterSpacing *float32

+ LineHeightScale *float32

+ Monospace bool

+ Strikethrough bool

+ Symbol bool

+ TabWidth int

+ Underline bool

+ Weight *TextWeight

+ func (t TextStyle) ResolvedLetterSpacing() float32

+ func (t TextStyle) ResolvedLineHeightScale() float32

+ func (t TextStyle) ResolvedWeight() TextWeight

+ type TextTruncation int

+ const TextTruncateClip

+ const TextTruncateEllipsis

+ const TextTruncateOff

+ type TextWeight float32

+ const WeightBlack

+ const WeightBold

+ const WeightExtraBold

+ const WeightExtraLight

+ const WeightLight

+ const WeightMedium

+ const WeightNormal

+ const WeightSemiBold

+ const WeightThin

+ type TextWrap int

+ const TextWrapBreak

+ const TextWrapOff

+ const TextWrapWord

+ type Theme interface

+ Color func(ThemeColorName, ThemeVariant) color.Color

+ Font func(TextStyle) Resource

+ Icon func(ThemeIconName) Resource

+ Size func(ThemeSizeName) float32

+ type ThemeColorName string

+ type ThemeIconName string

+ type ThemeSizeName string

+ type ThemeVariant uint

+ type ThemedResource interface

+ ThemeColorName func() ThemeColorName

+ type URI interface

+ Authority func() string

+ Extension func() string

+ Fragment func() string

+ MimeType func() string

+ Name func() string

+ Path func() string

+ Query func() string

+ Scheme func() string

+ func ClipboardFiles() []URI

+ type URIReadCloser interface

+ URI func() URI

+ type URIWithIcon interface

+ Icon func() Resource

+ type URIWriteCloser interface

+ URI func() URI

+ type Validatable interface

+ SetOnValidationChanged func(func(error))

+ Validate func() error

+ type Window interface

+ Canvas func() core.Canvas

+ CenterOnScreen func()

+ Close func()

+ Content func() core.CanvasObject

+ FixedSize func() bool

+ FullScreen func() bool

+ Hide func()

+ Icon func() Resource

+ MainMenu func() *MainMenu

+ Padded func() bool

+ RequestFocus func()

+ Resize func(geo.Size)

+ SelectableMode func() SelectableMode

+ SetCloseIntercept func(func())

+ SetContent func(core.CanvasObject)

+ SetFixedSize func(bool)

+ SetFullScreen func(bool)

+ SetIcon func(Resource)

+ SetMainMenu func(*MainMenu)

+ SetOnClosed func(func())

+ SetPadded func(bool)

+ SetSelectableMode func(SelectableMode)

+ SetTitle func(string)

+ Show func()

+ Title func() string

v1.0.0-rc.6

Jul 31, 2026

v1.0.0-rc.3

Jul 27, 2026

v1.0.0-rc.2

Jul 27, 2026

v1.0.0-rc.1

Jul 26, 2026