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// 15 july 2014
package ui
import (
"unsafe"
)
// #include "winapi_windows.h"
import "C"
type widgetbase struct {
hwnd C.HWND
}
func newWidget(class C.LPCWSTR, style C.DWORD, extstyle C.DWORD) *widgetbase {
return &widgetbase{
hwnd: C.newWidget(class, style, extstyle),
}
}
// these few methods are embedded by all the various Controls since they all will do the same thing
func (w *widgetbase) unparent() {
C.controlSetParent(w.hwnd, C.msgwin)
}
func (w *widgetbase) parent(win *window) {
C.controlSetParent(w.hwnd, win.hwnd)
}
// don't embed these as exported; let each Control decide if it should
func (w *widgetbase) text() *Request {
c := make(chan interface{})
return &Request{
op: func() {
c <- getWindowText(w.hwnd)
},
resp: c,
}
}
func (w *widgetbase) settext(text string) *Request {
c := make(chan interface{})
return &Request{
op: func() {
C.setWindowText(w.hwnd, toUTF16(text))
c <- struct{}{}
},
resp: c,
}
}
type button struct {
*widgetbase
clicked *event
}
var buttonclass = toUTF16("BUTTON")
func newButton(text string) *Request {
c := make(chan interface{})
return &Request{
op: func() {
w := newWidget(buttonclass,
C.BS_PUSHBUTTON | C.WS_TABSTOP,
0)
C.setWindowText(w.hwnd, toUTF16(text))
b := &button{
widgetbase: w,
clicked: newEvent(),
}
C.setButtonSubclass(w.hwnd, unsafe.Pointer(b))
c <- b
},
resp: c,
}
}
func (b *button) OnClicked(e func(c Doer)) *Request {
c := make(chan interface{})
return &Request{
op: func() {
b.clicked.set(e)
c <- struct{}{}
},
resp: c,
}
}
func (b *button) Text() *Request {
return b.text()
}
func (b *button) SetText(text string) *Request {
return b.settext(text)
}
//export buttonClicked
func buttonClicked(data unsafe.Pointer) {
b := (*button)(data)
b.clicked.fire()
println("button clicked")
}
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