89 lines
1.7 KiB
Go
89 lines
1.7 KiB
Go
// 12 february 2014
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package ui
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import (
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"sync"
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)
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// A Button represents a clickable button with some text.
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type Button struct {
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// Clicked gets a message when the button is clicked.
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// You cannot change it once the Window containing the Button has been created.
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// If you do not respond to this signal, nothing will happen.
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Clicked chan struct{}
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lock sync.Mutex
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created bool
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sysData *sysData
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initText string
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}
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// NewButton creates a new button with the specified text.
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func NewButton(text string) (b *Button) {
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return &Button{
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sysData: mksysdata(c_button),
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initText: text,
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Clicked: newEvent(),
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}
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}
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// SetText sets the button's text.
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func (b *Button) SetText(text string) {
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b.lock.Lock()
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defer b.lock.Unlock()
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if b.created {
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b.sysData.setText(text)
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return
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}
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b.initText = text
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}
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// Text returns the button's text.
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func (b *Button) Text() string {
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b.lock.Lock()
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defer b.lock.Unlock()
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if b.created {
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return b.sysData.text()
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}
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return b.initText
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}
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func (b *Button) make(window *sysData) error {
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b.lock.Lock()
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defer b.lock.Unlock()
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b.sysData.event = b.Clicked
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err := b.sysData.make(window)
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if err != nil {
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return err
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}
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b.sysData.setText(b.initText)
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b.created = true
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return nil
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}
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func (b *Button) allocate(x int, y int, width int, height int, d *sysSizeData) []*allocation {
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return []*allocation{&allocation{
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x: x,
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y: y,
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width: width,
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height: height,
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this: b,
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}}
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}
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func (b *Button) preferredSize(d *sysSizeData) (width int, height int) {
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return b.sysData.preferredSize(d)
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}
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func (b *Button) commitResize(a *allocation, d *sysSizeData) {
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b.sysData.commitResize(a, d)
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}
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func (b *Button) getAuxResizeInfo(d *sysSizeData) {
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b.sysData.getAuxResizeInfo(d)
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}
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