59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
// 12 february 2014
|
|
package main
|
|
|
|
import (
|
|
"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
|
|
sysData *sysData
|
|
initText string
|
|
}
|
|
|
|
// NewButton creates a new button with the specified text.
|
|
func NewButton(text string) (b *Button) {
|
|
return &Button{
|
|
sysData: mksysdata(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.created {
|
|
return b.sysData.setText(text)
|
|
}
|
|
b.initText = text
|
|
return nil
|
|
}
|
|
|
|
func (b *Button) make(window *sysData) error {
|
|
b.lock.Lock()
|
|
defer b.lock.Unlock()
|
|
|
|
b.sysData.event = b.Clicked
|
|
err := b.sysData.make(b.initText, 300, 300, window)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b.created = true
|
|
return nil
|
|
}
|
|
|
|
func (b *Button) setRect(x int, y int, width int, height int) error {
|
|
b.lock.Lock()
|
|
defer b.lock.Unlock()
|
|
|
|
return b.sysData.setRect(x, y, width, height)
|
|
}
|