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// 12 february 2014
package main
import (
"fmt"
"sync"
)
// A Button represents a clickable button with some text.
type Button struct {
// 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.
Clicked chan struct{}
lock sync.Mutex
created bool
parent Control
pWin *Window
sysData *sysData
initText string
}
// NewButton creates a new button with the specified text.
func NewButton(text string) (b *Button) {
return &Button{
sysData: &sysData{
cSysData: cSysData{
ctype: c_button,
},
},
initText: text,
Clicked: make(chan struct{}),
}
}
// SetText sets the button's text.
func (b *Button) SetText(text string) (err error) {
b.lock.Lock()
defer b.lock.Unlock()
if b.pWin != nil && b.pWin.created {
panic("TODO")
}
b.initText = text
return nil
}
func (b *Button) apply() error {
b.lock.Lock()
defer b.lock.Unlock()
if b.pWin == nil {
panic(fmt.Sprintf("button (initial text: %q) without parent window", b.initText))
}
if !b.pWin.created {
b.sysData.clicked = b.Clicked
b.sysData.parentWindow = b.pWin.sysData
return b.sysData.make(b.initText, 300, 300)
// TODO size to parent size
}
return b.sysData.show()
}
func (b *Button) setParent(c Control) {
b.parent = c
if w, ok := b.parent.(*Window); ok {
b.pWin = w
} else {
b.pWin = c.parentWindow()
}
}
func (b *Button) parentWindow() *Window {
return b.pWin
}
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