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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)
// TODO new control does not show up until window is resized
}
func (w *widgetbase) containerShow() {
C.ShowWindow(w.hwnd, C.SW_SHOW)
}
func (w *widgetbase) containerHide() {
C.ShowWindow(w.hwnd, C.SW_HIDE)
}
// don't embed these as exported; let each Control decide if it should
func (w *widgetbase) text() string {
return getWindowText(w.hwnd)
}
func (w *widgetbase) settext(text string) {
C.setWindowText(w.hwnd, toUTF16(text))
}
type button struct {
*widgetbase
clicked *event
}
var buttonclass = toUTF16("BUTTON")
func startNewButton(text string, style C.DWORD) *button {
w := newWidget(buttonclass,
style | C.WS_TABSTOP,
0)
C.setWindowText(w.hwnd, toUTF16(text))
C.controlSetControlFont(w.hwnd)
b := &button{
widgetbase: w,
clicked: newEvent(),
}
return b
}
func newButton(text string) *button {
b := startNewButton(text, C.BS_PUSHBUTTON)
C.setButtonSubclass(b.hwnd, unsafe.Pointer(b))
return b
}
func (b *button) OnClicked(e func()) {
b.clicked.set(e)
}
func (b *button) Text() string {
return b.text()
}
func (b *button) SetText(text string) {
b.settext(text)
}
//export buttonClicked
func buttonClicked(data unsafe.Pointer) {
b := (*button)(data)
b.clicked.fire()
println("button clicked")
}
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.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")
}
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