func cursorHandle(id wde.Cursor) w32.HCURSOR {
h, ok := cursorCache[id]
if !ok {
idc, ok := cursorIDC[id]
if !ok {
idc = w32.IDC_ARROW
}
h = w32.LoadCursor(0, w32.MakeIntResource(idc))
cursorCache[id] = h
}
return h
}
func RegisterClass(className string, wndproc uintptr) {
instance := GetAppInstance()
icon := w32.LoadIcon(instance, w32.MakeIntResource(w32.IDI_APPLICATION))
var wc w32.WNDCLASSEX
wc.Size = uint(unsafe.Sizeof(wc))
wc.Style = w32.CS_HREDRAW | w32.CS_VREDRAW
wc.WndProc = wndproc
wc.Instance = instance
wc.Background = w32.COLOR_BTNFACE + 1
wc.Icon = icon
wc.Cursor = w32.LoadCursor(0, w32.MakeIntResource(w32.IDC_ARROW))
wc.ClassName = syscall.StringToUTF16Ptr(className)
wc.MenuName = nil
wc.IconSm = icon
if ret := w32.RegisterClassEx(&wc); ret == 0 {
panic(syscall.GetLastError())
}
}
func (app *DemoApp) Initialize() {
app.CreateDeviceIndependentResources()
hInstance := w32.GetModuleHandle("")
icon := w32.LoadIcon(0, w32.MakeIntResource(w32.IDI_APPLICATION))
wndProc := func(hwnd w32.HWND, msg uint, wParam, lParam uintptr) uintptr {
return app.WndProc(hwnd, msg, wParam, lParam)
}
wndClass := w32.WNDCLASSEX{
Size: uint(unsafe.Sizeof(w32.WNDCLASSEX{})),
Style: w32.CS_HREDRAW | w32.CS_VREDRAW,
WndProc: syscall.NewCallback(wndProc),
ClsExtra: 0,
WndExtra: 0,
Instance: hInstance,
Icon: icon,
Cursor: w32.LoadCursor(0, w32.MakeIntResource(w32.IDC_ARROW)),
Background: 0,
MenuName: nil,
ClassName: syscall.StringToUTF16Ptr("D2DDemoApp"),
IconSm: icon,
}
w32.RegisterClassEx(&wndClass)
dpiX, dpiY := app.factory.GetDesktopDpi(app.factory)
app.hwnd = w32.CreateWindowEx(
0,
syscall.StringToUTF16Ptr("D2DDemoApp"),
syscall.StringToUTF16Ptr("Hello Windows"),
w32.WS_OVERLAPPEDWINDOW,
w32.CW_USEDEFAULT,
w32.CW_USEDEFAULT,
int(math.Ceil(float64(640*dpiX/96))),
int(math.Ceil(float64(640*dpiY/96))),
0,
0,
hInstance,
nil)
w32.ShowWindow(app.hwnd, w32.SW_SHOW)
w32.UpdateWindow(app.hwnd)
}