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// 15 july 2014
package ui
import (
"unsafe"
)
// #include "winapi_windows.h"
import "C"
type checkbox struct {
*button
}
func newCheckbox(text string) *checkbox {
c := &checkbox{
// don't use BS_AUTOCHECKBOX here because it creates problems when refocusing (see http://blogs.msdn.com/b/oldnewthing/archive/2014/05/22/10527522.aspx)
// we'll handle actually toggling the check state ourselves (see controls_windows.c)
button: startNewButton(text, C.BS_CHECKBOX),
}
c.fpreferredSize = c.checkboxpreferredSize
C.setCheckboxSubclass(c.hwnd, unsafe.Pointer(c))
return c
}
func (c *checkbox) Checked() bool {
if C.checkboxChecked(c.hwnd) == C.FALSE {
return false
}
return true
}
func (c *checkbox) SetChecked(checked bool) {
if checked {
C.checkboxSetChecked(c.hwnd, C.TRUE)
return
}
C.checkboxSetChecked(c.hwnd, C.FALSE)
}
//export checkboxToggled
func checkboxToggled(data unsafe.Pointer) {
c := (*checkbox)(data)
c.clicked.fire()
println("checkbox toggled")
}
const (
// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
checkboxHeight = 10
// from http://msdn.microsoft.com/en-us/library/windows/desktop/bb226818%28v=vs.85%29.aspx
checkboxXFromLeftOfBoxToLeftOfLabel = 12
)
func (c *checkbox) checkboxpreferredSize(d *sizing) (width, height int) {
return fromdlgunitsX(checkboxXFromLeftOfBoxToLeftOfLabel, d) + int(c.textlen),
fromdlgunitsY(checkboxHeight, d)
}
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