func comboBoxEditWndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr {
cb := (*ComboBox)(unsafe.Pointer(win.GetWindowLongPtr(hwnd, win.GWLP_USERDATA)))
switch msg {
case win.WM_GETDLGCODE:
if form := ancestor(cb); form != nil {
if dlg, ok := form.(dialogish); ok {
if dlg.DefaultButton() != nil {
// If the ComboBox lives in a Dialog that has a
// DefaultButton, we won't swallow the return key.
break
}
}
}
if wParam == win.VK_RETURN {
return win.DLGC_WANTALLKEYS
}
case win.WM_KEYDOWN:
if wParam != win.VK_RETURN || 0 == cb.SendMessage(win.CB_GETDROPPEDSTATE, 0, 0) {
cb.handleKeyDown(wParam, lParam)
}
case win.WM_KEYUP:
if wParam != win.VK_RETURN || 0 == cb.SendMessage(win.CB_GETDROPPEDSTATE, 0, 0) {
cb.handleKeyUp(wParam, lParam)
}
}
return win.CallWindowProc(cb.editOrigWndProcPtr, hwnd, msg, wParam, lParam)
}
// WndProc is the window procedure of the window.
//
// When implementing your own WndProc to add or modify behavior, call the
// WndProc of the embedded window for messages you don't handle yourself.
func (wb *WindowBase) WndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr {
switch msg {
case win.WM_ERASEBKGND:
if wb.background == nil {
break
}
canvas, err := newCanvasFromHDC(win.HDC(wParam))
if err != nil {
break
}
defer canvas.Dispose()
if err := canvas.FillRectangle(wb.background, wb.ClientBounds()); err != nil {
break
}
return 1
case win.WM_LBUTTONDOWN, win.WM_MBUTTONDOWN, win.WM_RBUTTONDOWN:
if msg == win.WM_LBUTTONDOWN && wb.origWndProcPtr == 0 {
// Only call SetCapture if this is no subclassed control.
// (Otherwise e.g. WM_COMMAND(BN_CLICKED) would no longer
// be generated for PushButton.)
win.SetCapture(wb.hWnd)
}
wb.publishMouseEvent(&wb.mouseDownPublisher, wParam, lParam)
case win.WM_LBUTTONUP, win.WM_MBUTTONUP, win.WM_RBUTTONUP:
if msg == win.WM_LBUTTONUP && wb.origWndProcPtr == 0 {
// See WM_LBUTTONDOWN for why we require origWndProcPtr == 0 here.
if !win.ReleaseCapture() {
lastError("ReleaseCapture")
}
}
wb.publishMouseEvent(&wb.mouseUpPublisher, wParam, lParam)
case win.WM_MOUSEMOVE:
wb.publishMouseEvent(&wb.mouseMovePublisher, wParam, lParam)
case win.WM_SETCURSOR:
if wb.cursor != nil {
win.SetCursor(wb.cursor.handle())
return 0
}
case win.WM_CONTEXTMENU:
sourceWindow := windowFromHandle(win.HWND(wParam))
if sourceWindow == nil {
break
}
x := win.GET_X_LPARAM(lParam)
y := win.GET_Y_LPARAM(lParam)
contextMenu := sourceWindow.ContextMenu()
var handle win.HWND
if widget, ok := sourceWindow.(Widget); ok {
handle = ancestor(widget).Handle()
} else {
handle = sourceWindow.Handle()
}
if contextMenu != nil {
win.TrackPopupMenuEx(
contextMenu.hMenu,
win.TPM_NOANIMATION,
x,
y,
handle,
nil)
return 0
}
case win.WM_KEYDOWN:
wb.handleKeyDown(wParam, lParam)
case win.WM_KEYUP:
wb.handleKeyUp(wParam, lParam)
case win.WM_SIZE, win.WM_SIZING:
wb.sizeChangedPublisher.Publish()
case win.WM_DESTROY:
if wb.origWndProcPtr != 0 {
// As we subclass all windows of system classes, we prevented the
// clean-up code in the WM_NCDESTROY handlers of some windows from
// being called. To fix this, we restore the original window
// procedure here.
win.SetWindowLongPtr(wb.hWnd, win.GWLP_WNDPROC, wb.origWndProcPtr)
}
delete(hwnd2WindowBase, hwnd)
wb.window.Dispose()
wb.hWnd = 0
}
if wb.origWndProcPtr != 0 {
return win.CallWindowProc(wb.origWndProcPtr, hwnd, msg, wParam, lParam)
}
return win.DefWindowProc(hwnd, msg, wParam, lParam)
}