pencere

package module
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 Go to latest Published: Sep 19, 2018 License: AGPL-3.0 Imports: 14 Imported by: 0

README

pencere

IT IS JUST A PROTOTYPE FOR NOW AND SUBJECT TO HEAVYLY CHANGE

A new Terminal UI kit for go

What is new
Full rendering with windows (rectangles)

Every ui element is a window (pencere) and ui is built by compositing new windows adding as child window. Every window can focus, receive mouse events, keyboard events, drag, drop, render and so on.

Pencere takes and dispatches terminal events to windows and renders windows based on Zindexes and window attributes like Visible and HasBorder

Layout

Every window has it's Layout event to change layout of itself or childs. Also every window has LayoutOrder attribute to take precedence on layout event order. So we can easly implement window slider where slider manages side windows layouts

Drag and Drop

Windows support Draggable,Droppable attributes to be come eligible for Drag and Drop events. OnDragBegin, OnDragEnd, OnDragging, OnDragEnter, OnDragOver, OnDragLeave, CanDrop and OnDrop events are supported.

Focusing

Windows can receive keyboard events when they are focused. Managed by CanFocus attribute.

Mouse events

Windows suport mouse events and events canbe received if relavent eventhandler is implemented, if not event may be handled by parent windows

New Event system (as message bus)

New event system will be implemented as message bus to support inter window communication

Sidebars

Windows has left right sidebar , top and bottom toolbars as window (pencere) means can be implemented as menu, toolbar or sticked toolboxes

Menu system

Menu systems and menu events ( in progress)

Because usage of window ui is very elastic and mature concept, many many widgets and features can be implemented.

Used libraries

Inspired and used some code from these libraries. Basicly tried to be like and compatible to reuse of widgets and other stuff

Documentation

Index

Constants

View Source 
const (
	TOP_RIGHT       = '┐'
	VERTICAL_LINE   = '│'
	HORIZONTAL_LINE = '─'
	TOP_LEFT        = '┌'
	BOTTOM_RIGHT    = '┘'
	BOTTOM_LEFT     = '└'
	VERTICAL_LEFT   = '┤'
	VERTICAL_RIGHT  = '├'
	HORIZONTAL_DOWN = '┬'
	HORIZONTAL_UP   = '┴'
	QUOTA_LEFT      = '«'
	QUOTA_RIGHT     = '»'

	FOCUSED_TOP_LEFT = '╒'
	FOCUSED_TOP_RIGT = '╕'
	FOCUSED_TOP      = '═'

	//SCROLL_BASE = '░'
	//SCROLL_BASE   = '█'
	SCROLL_BASE   = ' '
	SCROLL_BUTTON = '█'
)
View Source 
const (
	KeyBackspace  = KeyBS
	KeyTab        = KeyTAB
	KeyEsc        = KeyESC
	KeyEscape     = KeyESC
	KeyEnter      = KeyCR
	KeyBackspace2 = KeyDEL
)

These are aliases for other keys.

View Source 
const (
	BORDER = 1 << iota
	SCROLLABLE
	ENABLED
	VISIBLE
	CANFOCUS
)
View Source 
const ColorDefault = -1

ColorDefault = clear

View Source 
const DOTS = '…'

Variables

View Source 
var Bus = NewEventBus()
View Source 
var DefaultTheme = &Theme{
	styles: map[string]Style{
		"default":             {Fg: 100, Bg: 230},
		"border":              {Fg: 230, Bg: 0},
		"label":               {Fg: 230, Bg: 0},
		"menubar":             {Fg: 12, Bg: 123},
		"scrollbar":           {Fg: 12, Bg: 123, Texture: '░'},
		"textbox":             {Fg: 12, Bg: 50, Texture: '░'},
		"list.item.selected":  {Reverse: DecorationOn},
		"table.cell.selected": {Reverse: DecorationOn},
		"button.focused":      {Reverse: DecorationOn},
	},
}

DefaultTheme is a theme with reasonable defaults.

Functions

func Clear 

func Clear()

Clear clears the screen with the default Bg color.

func Close 

func Close()

Close finalizes termui library. It should be called after successful initialization when termui's functionality isn't required anymore.

func Decorate 

func Decorate(this *Pencere, buf *Buffer)

func Error 

func Error(issue, diagnostics string)

func Init 

func Init() error

Init initializes termui library. This function should be called before any others. After initialization, the library must be finalized by 'Close' function.

func Loop 

func Loop()

Loop gets events from termbox and passes them off to handleEvent. Stops when StopLoop is called.

func MaxString 

func MaxString(s string, l int) string

MaxString trims a string and adds dots if the string is longer than a give length.

func NextTo 

func NextTo(p *Pencere, n *Pencere) func() error

func Render 

func Render() error

func RenderOLD 

func RenderOLD(bs ...Bufferer)

Render renders all Bufferers in the given order to termbox, then asks termbox to print the screen.

func Round 

func Round(f float64) float64

func SetFocus 

func SetFocus(p *Pencere)

func StopLoop 

func StopLoop()

StopLoop stops the event loop.

Types

type Buffer 

type Buffer struct {
	Area    image.Rectangle // selected drawing area
	CellMap map[image.Point]Cell
}

Buffer is a renderable rectangle cell data container.

func NewBuffer 

func NewBuffer() *Buffer

NewBuffer returns a new empty Buffer.

func NewFilledBuffer 

func NewFilledBuffer(x0, y0, x1, y1 int, c Cell) *Buffer

NewFilledBuffer returns a new Buffer filled with the given Cell.

func (*Buffer) At 

func (self *Buffer) At(x, y int) Cell

At returns the cell at (x,y).

func (*Buffer) Fill 

func (self *Buffer) Fill(c Cell)

Fill fills the Buffer with a Cell.

func (*Buffer) Merge 

func (self *Buffer) Merge(bs ...*Buffer)

Merge merges the given buffers onto the current Buffer.

func (*Buffer) MergeChildArea 

func (self *Buffer) MergeChildArea(buf *Buffer, left, top, width, height int)

func (*Buffer) MergeWithOffset 

func (self *Buffer) MergeWithOffset(buf *Buffer, xOffset, yOffset int)

MergeWithOffset merges a Buffer onto another with an offset.

func (*Buffer) SetArea 

func (self *Buffer) SetArea(r image.Rectangle)

SetArea assigns a new rect area to self.

func (*Buffer) SetAreaXY 

func (self *Buffer) SetAreaXY(x, y int)

SetAreaXY sets the Buffer bounds from (0,0) to (x,y).

func (*Buffer) SetCell 

func (self *Buffer) SetCell(x, y int, c Cell)

SetCell assigns a Cell to (x,y).

func (*Buffer) SetString 

func (self *Buffer) SetString(x, y int, s string, fg, bg Color)

SetString assigns a string to a Buffer starting at (x,y).

type Bufferer 

type Bufferer interface {
	Buffer() *Buffer
	GetXOffset() int
	GetYOffset() int
}

Bufferer should be implemented by all renderable components.

type Cell 

type Cell struct {
	Ch rune
	Fg Color
	Bg Color
}

Cell is a rune with assigned Fg and Bg.

func NewCell 

func NewCell(ch rune, Fg, Bg Color) Cell

NewCell returne a new Cell given all necessary fields.

type Color 

type Color int

Color is an integer in the range -1 to 255. -1 is clear, while 0-255 are xterm 256 colors. 

const (
	AttrBold Color = 1 << (iota + 9)
	AttrUnderline
	AttrReverse
)

Copied from termbox. Attributes that can be bitwise OR'ed with a color.

type Colorscheme 

type Colorscheme struct {
	Fg Color
	Bg Color

	LabelFg  Color
	LabelBg  Color
	BorderFg Color
	BorderBg Color

	Sparkline   Color
	LineGraph   Color
	TableCursor Color
	GaugeColor  Color
}

A Colorscheme represents the current look-and-feel of the dashboard.

type Control 

type Control interface {
	Window() *Pencere
	AddWindow(c Control)
}

type Decoration 

type Decoration int

Decoration represents a bold/underline/etc. state 

const (
	DecorationInherit Decoration = iota
	DecorationOn
	DecorationOff
)

Decoration modes: Inherit from parent widget, explicitly on, or explicitly off.

type DragBeginEvent 

type DragBeginEvent struct {
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type DragContext 

type DragContext struct {
	Properties   Properties
	DraggingIcon *Pencere
	IconOffsetX  int
	IconOffsetY  int
}

func NewDragContext 

func NewDragContext(source *Pencere) *DragContext

type DragEndEvent 

type DragEndEvent struct {
	DragContext      *DragContext
	DropedPencere    *Pencere
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type DragEnterEvent 

type DragEnterEvent struct {
	DragContext      *DragContext
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type DragLeaveEvent 

type DragLeaveEvent struct {
	DragContext      *DragContext
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type DragOverEvent 

type DragOverEvent struct {
	DragContext      *DragContext
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type DraggingEvent 

type DraggingEvent struct {
	DragContext      *DragContext
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type DropEvent 

type DropEvent struct {
	DragContext      *DragContext
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type EventBus 

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

func NewEventBus 

func NewEventBus() *EventBus

func (*EventBus) On 

func (this *EventBus) On(ctx context.Context, subject string, callback EventCallback)

func (*EventBus) PushEvent 

func (this *EventBus) PushEvent(ctx context.Context, subject string, event interface{}) error

type EventCallback 

type EventCallback func(ctx context.Context, event interface{}) error

type EventData 

type EventData struct {
	Subject string
	Event   interface{}
}

type EventStream 

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

func (EventStream) HandleEvent 

func (this EventStream) HandleEvent(e tb.Event)

type Key 

type Key uint16
const (
	KeyRune Key = iota + 256
	KeyUp
	KeyDown
	KeyRight
	KeyLeft
	KeyUpLeft
	KeyUpRight
	KeyDownLeft
	KeyDownRight
	KeyCenter
	KeyPgUp
	KeyPgDn
	KeyHome
	KeyEnd
	KeyInsert
	KeyDelete
	KeyHelp
	KeyExit
	KeyClear
	KeyCancel
	KeyPrint
	KeyPause
	KeyBacktab
	KeyF1
	KeyF2
	KeyF3
	KeyF4
	KeyF5
	KeyF6
	KeyF7
	KeyF8
	KeyF9
	KeyF10
	KeyF11
	KeyF12
	KeyF13
	KeyF14
	KeyF15
	KeyF16
	KeyF17
	KeyF18
	KeyF19
	KeyF20
	KeyF21
	KeyF22
	KeyF23
	KeyF24
	KeyF25
	KeyF26
	KeyF27
	KeyF28
	KeyF29
	KeyF30
	KeyF31
	KeyF32
	KeyF33
	KeyF34
	KeyF35
	KeyF36
	KeyF37
	KeyF38
	KeyF39
	KeyF40
	KeyF41
	KeyF42
	KeyF43
	KeyF44
	KeyF45
	KeyF46
	KeyF47
	KeyF48
	KeyF49
	KeyF50
	KeyF51
	KeyF52
	KeyF53
	KeyF54
	KeyF55
	KeyF56
	KeyF57
	KeyF58
	KeyF59
	KeyF60
	KeyF61
	KeyF62
	KeyF63
	KeyF64
)

These are named keys that can be handled. 

const (
	KeyCtrlSpace Key = iota
	KeyCtrlA
	KeyCtrlB
	KeyCtrlC
	KeyCtrlD
	KeyCtrlE
	KeyCtrlF
	KeyCtrlG
	KeyCtrlH
	KeyCtrlI
	KeyCtrlJ
	KeyCtrlK
	KeyCtrlL
	KeyCtrlM
	KeyCtrlN
	KeyCtrlO
	KeyCtrlP
	KeyCtrlQ
	KeyCtrlR
	KeyCtrlS
	KeyCtrlT
	KeyCtrlU
	KeyCtrlV
	KeyCtrlW
	KeyCtrlX
	KeyCtrlY
	KeyCtrlZ
	KeyCtrlLeftSq // Escape
	KeyCtrlBackslash
	KeyCtrlRightSq
	KeyCtrlCarat
	KeyCtrlUnderscore
)

These are the supported control keys. 

const (
	KeyNUL Key = iota
	KeySOH
	KeySTX
	KeyETX
	KeyEOT
	KeyENQ
	KeyACK
	KeyBEL
	KeyBS
	KeyTAB
	KeyLF
	KeyVT
	KeyFF
	KeyCR
	KeySO
	KeySI
	KeyDLE
	KeyDC1
	KeyDC2
	KeyDC3
	KeyDC4
	KeyNAK
	KeySYN
	KeyETB
	KeyCAN
	KeyEM
	KeySUB
	KeyESC
	KeyFS
	KeyGS
	KeyRS
	KeyUS
	KeyDEL Key = 0x7F
)

These are the defined ASCII values for key codes.

type KeyEvent 

type KeyEvent struct {
	Target *Pencere
	Mod    tb.Modifier // one of Mod* constants or 0
	Key    tb.Key      // one of Key* constants, invalid if 'Ch' is not 0
	Rune   rune
}
type Menu struct {
	Title     string `json:"title"`
	MenuItems []*MenuItem
}
type MenuItem struct {
	Title string `json:"title"`
}
type MenuList struct {
	Menus []*Menu
}

type Modifier 

type Modifier int16

Modifier is a mask of modifier keys.

type MouseEvent 

type MouseEvent struct {
	Target           *Pencere
	GlobalX, GlobalY int
	X, Y             int
	Type             int
}

type MultiLineTextBox 

type MultiLineTextBox struct {
	*Pencere
	// contains filtered or unexported fields
}

func NewMultiLineTextBox 

func NewMultiLineTextBox(options ...Option) (*MultiLineTextBox, error)

func (*MultiLineTextBox) OnKeyEvent 

func (this *MultiLineTextBox) OnKeyEvent(ev KeyEvent) error

func (*MultiLineTextBox) Render 

func (this *MultiLineTextBox) Render(buf *Buffer) error

type Option 

type Option func(*Pencere) error

Option ...

func LayoutFill 

func LayoutFill() Option

func Position 

func Position(left, top, width, height int) Option

func ResetFlag 

func ResetFlag(flags int) Option

func SetFlag 

func SetFlag(flags int) Option

type Pencere 

type Pencere struct {
	Label   string
	LabelFg Color
	LabelBg Color

	Text string

	Inner image.Rectangle

	Fg      Color
	Bg      Color
	Texture rune

	Left, Top     int
	Width, Height int
	CanFocus      bool
	HasFocus      bool
	HasBorder     bool

	Scrollable bool
	ContentX   int
	ContentY   int

	BorderFg Color
	BorderBg Color

	Render  func(buffer *Buffer) error
	Enabled bool
	Visible bool

	Layout func() error

	Id   string
	Kind string
	Tag  string

	OnMouseLeftClick func(event MouseEvent) error
	OnFocus          func() error
	OnLostFocus      func() error

	OnKeyEvent  func(event KeyEvent) error
	Data        interface{}
	Controller  interface{}
	Draggable   bool
	Droppable   bool
	OnDragBegin func(event DragBeginEvent) (bool, *DragContext, error)
	OnDragging  func(event DraggingEvent) error
	OnDragEnd   func(event DragEndEvent) error
	OnDragEnter func(event DragEnterEvent) error
	OnDragLeave func(event DragLeaveEvent) error
	OnDragOver  func(event DragOverEvent) error
	OnDrop      func(event DropEvent) error
	CanDrop     func(event DropEvent) (bool, error)

	Properties Properties

	Theme *Theme
	// contains filtered or unexported fields
}

func NewBox 

func NewBox(options ...Option) (*Pencere, error)

func NewButton 

func NewButton(label string, options ...Option) (*Pencere, error)

func NewMenuBar 

func NewMenuBar(options ...Option) (*Pencere, error)

func NewOutput 

func NewOutput(options ...Option) (*Pencere, error)

func NewPencere 

func NewPencere(options ...Option) (*Pencere, error)

func NewStatusBar 

func NewStatusBar(options ...Option) (*Pencere, error)

func Root 

func Root() *Pencere

func (*Pencere) AddWindow 

func (this *Pencere) AddWindow(c Control)

func (*Pencere) Apply 

func (this *Pencere) Apply(options ...Option) error

func (*Pencere) Childs 

func (this *Pencere) Childs() []*Pencere

func (*Pencere) FireEvent 

func (this *Pencere) FireEvent(eventType string, data interface{}) error

func (*Pencere) GetLayoutOrder 

func (this *Pencere) GetLayoutOrder() int

func (*Pencere) GetZIndex 

func (this *Pencere) GetZIndex() int

func (*Pencere) GlobalPosition 

func (this *Pencere) GlobalPosition() (int, int)

func (*Pencere) Parent 

func (this *Pencere) Parent() *Pencere

func (*Pencere) SetButtomBar 

func (this *Pencere) SetButtomBar(p *Pencere)

func (*Pencere) SetLayoutOrder 

func (this *Pencere) SetLayoutOrder(layoutOrder int)

func (*Pencere) SetLeftBar 

func (this *Pencere) SetLeftBar(p *Pencere)

func (*Pencere) SetRightBar 

func (this *Pencere) SetRightBar(p *Pencere)

func (*Pencere) SetTopBar 

func (this *Pencere) SetTopBar(p *Pencere)

func (*Pencere) SetZIndex 

func (this *Pencere) SetZIndex(zindex int)

func (*Pencere) TranslateToXY 

func (this *Pencere) TranslateToXY(globalX int, globalY int) (int, int)

func (*Pencere) Window 

func (this *Pencere) Window() *Pencere

type PencereOrder 

type PencereOrder struct {
	Order   int
	Pencere *Pencere
}

type Properties 

type Properties map[string]interface{}

func NewProperties 

func NewProperties() Properties

func (Properties) GetColor 

func (this Properties) GetColor(key string, def Color) Color

func (Properties) GetInt 

func (this Properties) GetInt(key string, def int) int

func (Properties) GetString 

func (this Properties) GetString(key string, def string) string

func (Properties) GetValue 

func (this Properties) GetValue(name string) interface{}

func (Properties) SetColor 

func (this Properties) SetColor(name string, value Color)

func (Properties) SetInt 

func (this Properties) SetInt(name string, value int)

func (Properties) SetString 

func (this Properties) SetString(name string, value string)

func (Properties) SetValue 

func (this Properties) SetValue(name string, value interface{})

type RuneBuffer 

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

RuneBuffer provides readline functionality for text widgets.

func (*RuneBuffer) Backspace 

func (r *RuneBuffer) Backspace()

Backspace deletes the rune left of the cursor.

func (*RuneBuffer) CursorPos 

func (r *RuneBuffer) CursorPos() image.Point

CursorPos returns the coordinate for the cursor for a given width.

func (*RuneBuffer) Delete 

func (r *RuneBuffer) Delete()

Delete deletes the rune at the current cursor position.

func (*RuneBuffer) Kill 

func (r *RuneBuffer) Kill()

Kill deletes all runes from the cursor until the end of the line.

func (*RuneBuffer) Len 

func (r *RuneBuffer) Len() int

Len returns the number of runes in the buffer.

func (*RuneBuffer) MoveBackward 

func (r *RuneBuffer) MoveBackward()

MoveBackward moves the cursor back by one rune.

func (*RuneBuffer) MoveForward 

func (r *RuneBuffer) MoveForward()

MoveForward moves the cursor forward by one rune.

func (*RuneBuffer) MoveToLineEnd 

func (r *RuneBuffer) MoveToLineEnd()

MoveToLineEnd moves the cursor to the end of the current line.

func (*RuneBuffer) MoveToLineStart 

func (r *RuneBuffer) MoveToLineStart()

MoveToLineStart moves the cursor to the start of the current line.

func (*RuneBuffer) Pos 

func (r *RuneBuffer) Pos() int

Pos returns the current index in the buffer.

func (*RuneBuffer) Runes 

func (r *RuneBuffer) Runes() []rune

Runes return the buffer

func (*RuneBuffer) Set 

func (r *RuneBuffer) Set(buf []rune)

Set the buffer and the index at the end of the buffer.

func (*RuneBuffer) SetMaxWidth 

func (r *RuneBuffer) SetMaxWidth(w int)

SetMaxWidth sets the maximum text width.

func (*RuneBuffer) SetWithIdx 

func (r *RuneBuffer) SetWithIdx(idx int, buf []rune)

SetWithIdx set the the buffer with a given index.

func (*RuneBuffer) SplitByLine 

func (r *RuneBuffer) SplitByLine() []string

SplitByLine returns the lines for a given width.

func (*RuneBuffer) String 

func (r *RuneBuffer) String() string

func (*RuneBuffer) Width 

func (r *RuneBuffer) Width() int

Width returns the width of the rune buffer, taking into account for CJK.

func (*RuneBuffer) WriteRune 

func (r *RuneBuffer) WriteRune(s rune)

WriteRune appends a rune to the buffer.

func (*RuneBuffer) WriteRunes 

func (r *RuneBuffer) WriteRunes(s []rune)

WriteRunes appends runes to the buffer.

type Style 

type Style struct {
	Fg Color
	Bg Color

	Texture   rune
	Brush     rune
	Reverse   Decoration
	Bold      Decoration
	Underline Decoration
}

type Table 

type Table struct {
	*Pencere

	Header []string
	Rows   [][]string

	ColWidths  []int
	CellXPos   []int  // column position
	ColResizer func() // for widgets that inherit a Table and want to overload the ColResize method
	Gap        int    // gap between columns
	PadLeft    int

	Cursor      bool
	CursorColor Color

	UniqueCol    int    // the column used to identify the selected item
	SelectedItem string // used to keep the cursor on the correct item if the data changes
	SelectedRow  int
	TopRow       int // used to indicate where in the table we are scrolled at
}

Table tracks all the attributes of a Table instance

func NewTable 

func NewTable() *Table

NewTable returns a new Table instance

func (*Table) Bottom 

func (self *Table) Bottom()

func (*Table) Click 

func (self *Table) Click(x, y int)

func (*Table) ColResize 

func (self *Table) ColResize()

ColResize is the default column resizer, but can be overriden. ColResize calculates the width of each column.

func (*Table) Down 

func (self *Table) Down()

func (*Table) HalfPageDown 

func (self *Table) HalfPageDown()

func (*Table) HalfPageUp 

func (self *Table) HalfPageUp()

func (*Table) OnKeyEvent 

func (self *Table) OnKeyEvent(event KeyEvent) error

func (*Table) PageDown 

func (self *Table) PageDown()

func (*Table) PageUp 

func (self *Table) PageUp()

func (*Table) Render 

func (self *Table) Render(buf *Buffer) error

Buffer implements the Bufferer interface.

func (*Table) Top 

func (self *Table) Top()

func (*Table) Up 

func (self *Table) Up()

type Theme 

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

func NewTheme 

func NewTheme() *Theme

NewTheme return an empty theme.

func (*Theme) HasStyle 

func (p *Theme) HasStyle(name string) bool

HasStyle returns whether an identifier is associated with an identifier.

func (*Theme) SetStyle 

func (p *Theme) SetStyle(n string, i Style)

SetStyle sets a style for a given identifier.

func (*Theme) Style 

func (p *Theme) Style(name string) Style

Style returns the style associated with an identifier. If there is no Style associated with the name, it returns a default Style.

type VerticalSplitter 

type VerticalSplitter struct {
	*Pencere
	LeftSide  *Pencere
	RightSide *Pencere
}

func NewVerticalSplitter 

func NewVerticalSplitter(options ...Option) (*VerticalSplitter, error)

func (*VerticalSplitter) Layout 

func (this *VerticalSplitter) Layout() error

func (*VerticalSplitter) OnDragBegin 

func (this *VerticalSplitter) OnDragBegin(event DragBeginEvent) (bool, *DragContext, error)

func (*VerticalSplitter) Render 

func (this *VerticalSplitter) Render(buf *Buffer) error

type Widget 

type Widget interface {
	Control
}

Source Files

View all Source files

Directories

Path Synopsis
examples
basic
chessboard
colortest
table
terminalcolors

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