75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
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// 12 february 2014
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package main
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import (
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"fmt"
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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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// This channel gets a message when the button is clicked. Unlike other channels in this package, this channel is initialized to non-nil when creating a new button, and cannot be set to nil later.
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Clicked chan struct{}
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lock sync.Mutex
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created bool
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parent Control
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pWin *Window
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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: &sysData{
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cSysData: cSysData{
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ctype: c_button,
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},
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},
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initText: text,
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Clicked: make(chan struct{}),
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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) (err error) {
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b.lock.Lock()
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defer b.lock.Unlock()
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if b.pWin != nil && b.pWin.created {
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panic("TODO")
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}
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b.initText = text
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return nil
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}
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func (b *Button) apply() error {
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b.lock.Lock()
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defer b.lock.Unlock()
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if b.pWin == nil {
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panic(fmt.Sprintf("button (initial text: %q) without parent window", b.initText))
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}
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if !b.pWin.created {
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b.sysData.clicked = b.Clicked
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b.sysData.parentWindow = b.pWin.sysData
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return b.sysData.make(b.initText, 300, 300)
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// TODO size to parent size
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}
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return b.sysData.show()
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}
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func (b *Button) setParent(c Control) {
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b.parent = c
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if w, ok := b.parent.(*Window); ok {
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b.pWin = w
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} else {
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b.pWin = c.parentWindow()
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}
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}
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func (b *Button) parentWindow() *Window {
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return b.pWin
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}
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