gocui

package module
v0.1.0 Latest Latest
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 Go to latest Published: Jan 27, 2014 License: BSD-3-Clause Imports: 5 Imported by: 0

README

GOCUI - Go Console User Interface

Minimalist Go library aimed at creating Console User Interfaces.

Installation

go get github.com/jroimartin/gocui

Documentation

godoc github.com/jroimartin/gocui

Example

func layout(g *gocui.Gui) error {
	maxX, maxY := g.Size()
	if v, err := g.SetView("center", maxX/2-10, maxY/2, maxX/2+10, maxY/2+2); err != nil {
		if err != gocui.ErrorUnkView {
			return err
		}
		fmt.Fprintln(v, "This is an example")
	}
	return nil
}
func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrorQuit
}
func main() {
	var err error
	g := gocui.NewGui()
	if err := g.Init(); err != nil {
		log.Panicln(err)
	}
	defer g.Close()
	g.SetLayout(layout)
	if err := g.SetKeybinding("", gocui.KeyCtrlC, 0, quit); err != nil {
		log.Panicln(err)
	}
	err = g.MainLoop()
	if err != nil && err != gocui.ErrorQuit {
		log.Panicln(err)
	}
}

Documentation

Overview

Package gocui allows to create console user interfaces.

Example: 

func layout(g *gocui.Gui) error {
	maxX, maxY := g.Size()
	if v, err := g.SetView("center", maxX/2-10, maxY/2, maxX/2+10, maxY/2+2); err != nil {
		if err != gocui.ErrorUnkView {
			return err
		}
		fmt.Fprintln(v, "This is an example")
	}
	return nil
}
func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrorQuit
}
func main() {
	var err error
	g := gocui.NewGui()
	if err := g.Init(); err != nil {
		log.Panicln(err)
	}
	defer g.Close()
	g.SetLayout(layout)
	if err := g.SetKeybinding("", gocui.KeyCtrlC, 0, quit); err != nil {
		log.Panicln(err)
	}
	err = g.MainLoop()
	if err != nil && err != gocui.ErrorQuit {
		log.Panicln(err)
	}
}

Index

Constants

View Source 
const (
	ColorDefault Attribute = Attribute(termbox.ColorDefault)
	ColorBlack             = Attribute(termbox.ColorBlack)
	ColorRed               = Attribute(termbox.ColorRed)
	ColorGreen             = Attribute(termbox.ColorGreen)
	ColorYellow            = Attribute(termbox.ColorYellow)
	ColorBlue              = Attribute(termbox.ColorBlue)
	ColorMagenta           = Attribute(termbox.ColorMagenta)
	ColorCyan              = Attribute(termbox.ColorCyan)
	ColorWhite             = Attribute(termbox.ColorWhite)
)

Color attributes.

View Source 
const (
	AttrBold      Attribute = Attribute(termbox.AttrBold)
	AttrUnderline           = Attribute(termbox.AttrUnderline)
	AttrReverse             = Attribute(termbox.AttrReverse)
)

Text style attributes.

View Source 
const (
	KeyF1         Key = Key(termbox.KeyF1)
	KeyF2             = Key(termbox.KeyF2)
	KeyF3             = Key(termbox.KeyF3)
	KeyF4             = Key(termbox.KeyF4)
	KeyF5             = Key(termbox.KeyF5)
	KeyF6             = Key(termbox.KeyF6)
	KeyF7             = Key(termbox.KeyF7)
	KeyF8             = Key(termbox.KeyF8)
	KeyF9             = Key(termbox.KeyF9)
	KeyF10            = Key(termbox.KeyF10)
	KeyF11            = Key(termbox.KeyF11)
	KeyF12            = Key(termbox.KeyF12)
	KeyInsert         = Key(termbox.KeyInsert)
	KeyDelete         = Key(termbox.KeyDelete)
	KeyHome           = Key(termbox.KeyHome)
	KeyEnd            = Key(termbox.KeyEnd)
	KeyPgup           = Key(termbox.KeyPgup)
	KeyPgdn           = Key(termbox.KeyPgdn)
	KeyArrowUp        = Key(termbox.KeyArrowUp)
	KeyArrowDown      = Key(termbox.KeyArrowDown)
	KeyArrowLeft      = Key(termbox.KeyArrowLeft)
	KeyArrowRight     = Key(termbox.KeyArrowRight)
)

Special keys.

View Source 
const (
	KeyCtrlTilde      Key = Key(termbox.KeyCtrlTilde)
	KeyCtrl2              = Key(termbox.KeyCtrl2)
	KeyCtrlSpace          = Key(termbox.KeyCtrlSpace)
	KeyCtrlA              = Key(termbox.KeyCtrlA)
	KeyCtrlB              = Key(termbox.KeyCtrlB)
	KeyCtrlC              = Key(termbox.KeyCtrlC)
	KeyCtrlD              = Key(termbox.KeyCtrlD)
	KeyCtrlE              = Key(termbox.KeyCtrlE)
	KeyCtrlF              = Key(termbox.KeyCtrlF)
	KeyCtrlG              = Key(termbox.KeyCtrlG)
	KeyBackspace          = Key(termbox.KeyBackspace)
	KeyCtrlH              = Key(termbox.KeyCtrlH)
	KeyTab                = Key(termbox.KeyTab)
	KeyCtrlI              = Key(termbox.KeyCtrlI)
	KeyCtrlJ              = Key(termbox.KeyCtrlJ)
	KeyCtrlK              = Key(termbox.KeyCtrlK)
	KeyCtrlL              = Key(termbox.KeyCtrlL)
	KeyEnter              = Key(termbox.KeyEnter)
	KeyCtrlM              = Key(termbox.KeyCtrlM)
	KeyCtrlN              = Key(termbox.KeyCtrlN)
	KeyCtrlO              = Key(termbox.KeyCtrlO)
	KeyCtrlP              = Key(termbox.KeyCtrlP)
	KeyCtrlQ              = Key(termbox.KeyCtrlQ)
	KeyCtrlR              = Key(termbox.KeyCtrlR)
	KeyCtrlS              = Key(termbox.KeyCtrlS)
	KeyCtrlT              = Key(termbox.KeyCtrlT)
	KeyCtrlU              = Key(termbox.KeyCtrlU)
	KeyCtrlV              = Key(termbox.KeyCtrlV)
	KeyCtrlW              = Key(termbox.KeyCtrlW)
	KeyCtrlX              = Key(termbox.KeyCtrlX)
	KeyCtrlY              = Key(termbox.KeyCtrlY)
	KeyCtrlZ              = Key(termbox.KeyCtrlZ)
	KeyEsc                = Key(termbox.KeyEsc)
	KeyCtrlLsqBracket     = Key(termbox.KeyCtrlLsqBracket)
	KeyCtrl3              = Key(termbox.KeyCtrl3)
	KeyCtrl4              = Key(termbox.KeyCtrl4)
	KeyCtrlBackslash      = Key(termbox.KeyCtrlBackslash)
	KeyCtrl5              = Key(termbox.KeyCtrl5)
	KeyCtrlRsqBracket     = Key(termbox.KeyCtrlRsqBracket)
	KeyCtrl6              = Key(termbox.KeyCtrl6)
	KeyCtrl7              = Key(termbox.KeyCtrl7)
	KeyCtrlSlash          = Key(termbox.KeyCtrlSlash)
	KeyCtrlUnderscore     = Key(termbox.KeyCtrlUnderscore)
	KeySpace              = Key(termbox.KeySpace)
	KeyBackspace2         = Key(termbox.KeyBackspace2)
	KeyCtrl8              = Key(termbox.KeyCtrl8)
)

Keys combinations.

Variables

View Source 
var (
	// ErrorQuit is used to decide if the MainLoop finished succesfully.
	ErrorQuit error = errors.New("quit")

	// ErrorUnkView allows to assert if a View must be initialized.
	ErrorUnkView error = errors.New("unknown view")
)

Functions

This section is empty.

Types

type Attribute 

type Attribute termbox.Attribute

Attributes can be combined using bitwise OR (|). Note that it is not possible to combine multiple color attributes.

type Gui 

type Gui struct {

	// BgColor and FgColor allow to configure the background and foreground
	// colors of the GUI.
	BgColor, FgColor Attribute

	// SelBgColor and SelFgColor are used to configure the background and
	// foreground colors of the selected line, when it is highlighted.
	SelBgColor, SelFgColor Attribute

	// If ShowCursor is true then the cursor is enabled.
	ShowCursor bool
	// contains filtered or unexported fields
}

Gui represents the whole User Interface, including the views, layouts and keybindings.

func NewGui 

func NewGui() *Gui

NewGui returns a new Gui object.

func (*Gui) Close 

func (g *Gui) Close()

Close finalizes the library. It should be called after a successful initialization and when gocui is not needed anymore.

func (*Gui) CurrentView 

func (g *Gui) CurrentView() *View

CurrentView returns the currently focused view, or nil if no view owns the focus.

func (*Gui) DeleteView 

func (g *Gui) DeleteView(name string) error

DeleteView deletes a view by name.

func (*Gui) Flush 

func (g *Gui) Flush() error

Flush updates the gui, re-drawing frames and buffers.

func (*Gui) Init 

func (g *Gui) Init() error

Init initializes the library. This function must be called before any other functions.

func (*Gui) MainLoop 

func (g *Gui) MainLoop() error

MainLoop runs the main loop until an error is returned. A successful finish should return ErrorQuit.

func (*Gui) Rune 

func (g *Gui) Rune(x, y int) (rune, error)

Rune returns the rune contained in the cell at the given position. It checks if the position is valid.

func (*Gui) SetCurrentView 

func (g *Gui) SetCurrentView(name string) error

SetCurrentView gives the focus to a given view.

func (*Gui) SetKeybinding 

func (g *Gui) SetKeybinding(viewname string, key interface{}, mod Modifier, h KeybindingHandler) error

SetKeybinding creates a new keybinding. If viewname equals to "" (empty string) then the keybinding will apply to all views. key must be a rune or a Key.

func (*Gui) SetLayout 

func (g *Gui) SetLayout(layout func(*Gui) error)

SetLayout sets the current layout. A layout is a function that will be called everytime the gui is re-drawed, it must contain the base views and its initializations.

func (*Gui) SetRune 

func (g *Gui) SetRune(x, y int, ch rune) error

SetRune writes a rune at the given point, relative to the top-left corner of the terminal. It checks if the position is valid and applies the gui's colors.

func (*Gui) SetView 

func (g *Gui) SetView(name string, x0, y0, x1, y1 int) (*View, error)

SetView creates a new view with its top-left corner at (x0, y0) and the bottom-right one at (x1, y1). If a view with the same name already exists, its dimensions are updated; otherwise, the error ErrorUnkView is returned, which allows to assert if the View must be initialized. It checks if the position is valid.

func (*Gui) Size 

func (g *Gui) Size() (x, y int)

Size returns the terminal's size.

func (*Gui) View 

func (g *Gui) View(name string) *View

View returns a pointer to the view with the given name, or nil if a view with that name does not exist.

type Key 

type Key termbox.Key

Keys represent special keys or keys combinations.

type KeybindingHandler 

type KeybindingHandler func(*Gui, *View) error

KeybindingHandlers represent the actions linked to keybindings. The handler is called when a key-press event satisfies a configured keybinding.

type Modifier 

type Modifier termbox.Modifier

Modifiers allow to define special keys combinations. They can be used in combination with Keys or Runes when a new keybinding is defined. 

const (
	ModAlt Modifier = Modifier(termbox.ModAlt)
)

Modifiers.

type View 

type View struct {

	// If Editable is true, keystrokes will be added to the view's internal
	// buffer at the cursor position.
	Editable bool

	// If Highlight is true, Sel{Bg,Fg}Colors will be used
	// for the line under the cursor position.
	Highlight bool
	// contains filtered or unexported fields
}

A View is a window. It maintains its own internal buffer and cursor position.

func (*View) Clear 

func (v *View) Clear()

Clear empties the view's internal buffer.

func (*View) Cursor 

func (v *View) Cursor() (x, y int)

Cursor returns the cursor position of the view.

func (*View) Line 

func (v *View) Line(y int) (string, error)

Line returns a string with the line of the view's internal buffer at the position corresponding to the point (x, y).

func (*View) Name 

func (v *View) Name() string

Name returns the name of the view.

func (*View) Origin 

func (v *View) Origin() (x, y int)

Origin returns the origin position of the view.

func (*View) SetCursor 

func (v *View) SetCursor(x, y int) error

SetCursor sets the cursor position of the view at the given point, relative to the view. It checks if the position is valid.

func (*View) SetOrigin 

func (v *View) SetOrigin(x, y int) error

SetOrigin sets the origin position of the view's internal buffer, so the buffer starts to be printed from this point, which means that it is linked with the origin point of view. It can be used to implement Horizontal and Vertical scrolling with just incrementing or decrementing ox and oy.

func (*View) Size 

func (v *View) Size() (x, y int)

Size returns the number of visible columns and rows in the View.

func (*View) Word 

func (v *View) Word(x, y int) (string, error)

Word returns a string with the word of the view's internal buffer at the position corresponding to the point (x, y).

func (*View) Write 

func (v *View) Write(p []byte) (n int, err error)

Write appends a byte slice into the view's internal buffer. Because View implements the io.Writer interface, it can be passed as parameter of functions like fmt.Fprintf, fmt.Fprintln, io.Copy, etc. Clear must be called to clear the view's buffer.

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