mirror of https://github.com/rivo/tview.git
136 lines
3.5 KiB
Go
136 lines
3.5 KiB
Go
package tview
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import (
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"github.com/gdamore/tcell"
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)
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// Button is labeled box that triggers an action when selected.
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type Button struct {
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*Box
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// The text to be displayed before the input area.
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label string
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// The label color.
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labelColor tcell.Color
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// The label color when the button is in focus.
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labelColorActivated tcell.Color
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// The background color when the button is in focus.
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backgroundColorActivated tcell.Color
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// An optional function which is called when the button was selected.
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selected func()
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// An optional function which is called when the user leaves the button. A
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// key is provided indicating which key was pressed to leave (tab or backtab).
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blur func(tcell.Key)
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}
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// NewButton returns a new input field.
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func NewButton(label string) *Button {
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box := NewBox().SetBackgroundColor(tcell.ColorBlue)
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return &Button{
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Box: box,
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label: label,
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labelColor: tcell.ColorWhite,
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labelColorActivated: tcell.ColorBlue,
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backgroundColorActivated: tcell.ColorWhite,
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}
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}
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// SetLabel sets the button text.
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func (b *Button) SetLabel(label string) *Button {
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b.label = label
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return b
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}
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// GetLabel returns the button text.
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func (b *Button) GetLabel() string {
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return b.label
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}
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// SetLabelColor sets the color of the button text.
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func (b *Button) SetLabelColor(color tcell.Color) *Button {
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b.labelColor = color
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return b
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}
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// SetLabelColorActivated sets the color of the button text when the button is
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// in focus.
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func (b *Button) SetLabelColorActivated(color tcell.Color) *Button {
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b.labelColorActivated = color
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return b
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}
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// SetBackgroundColorActivated sets the background color of the button text when
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// the button is in focus.
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func (b *Button) SetBackgroundColorActivated(color tcell.Color) *Button {
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b.backgroundColorActivated = color
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return b
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}
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// SetSelectedFunc sets a handler which is called when the button was selected.
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func (b *Button) SetSelectedFunc(handler func()) *Button {
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b.selected = handler
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return b
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}
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// SetBlurFunc sets a handler which is called when the user leaves the button.
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// The callback function is provided with the key that was pressed, which is one
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// of the following:
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//
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// - KeyEscape: Leaving the button with no specific direction.
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// - KeyTab: Move to the next field.
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// - KeyBacktab: Move to the previous field.
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func (b *Button) SetBlurFunc(handler func(key tcell.Key)) *Button {
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b.blur = handler
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return b
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}
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// Draw draws this primitive onto the screen.
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func (b *Button) Draw(screen tcell.Screen) {
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// Draw the box.
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backgroundColor := b.backgroundColor
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if b.focus.HasFocus() {
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b.backgroundColor = b.backgroundColorActivated
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}
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b.Box.Draw(screen)
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b.backgroundColor = backgroundColor
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// Draw label.
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x := b.x + b.width/2
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y := b.y + b.height/2
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width := b.width
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if b.border {
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width -= 2
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}
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labelColor := b.labelColor
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if b.focus.HasFocus() {
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labelColor = b.labelColorActivated
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}
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Print(screen, b.label, x, y, width, AlignCenter, labelColor)
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if b.focus.HasFocus() {
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screen.HideCursor()
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}
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}
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// InputHandler returns the handler for this primitive.
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func (b *Button) InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) {
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return func(event *tcell.EventKey, setFocus func(p Primitive)) {
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// Process key event.
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switch key := event.Key(); key {
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case tcell.KeyEnter: // Selected.
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if b.selected != nil {
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b.selected()
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}
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case tcell.KeyBacktab, tcell.KeyTab, tcell.KeyEscape: // Leave. No action.
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if b.blur != nil {
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b.blur(key)
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}
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}
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}
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}
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