Unsolved Adding QMacNativeWidget to a NSView without an NSWindow

[inhwan]

Hi,

As per the title I was wondering if there are any restrictions in adding a QMacNativeWidget to a NSView without an NSWindow (i.e. The NSView 'window' property is nil).

I am adding my NSView to the NSWindow after adding the QMacNativeWidget which leads to the QMacNativeWidget not rendering. If I add my NSView to the NSWindow before adding the QMacNativeWidget it works fine.

The trouble is I need to add my NSView to the NSWindow after adding the QMacNativeWidget. I am wondering if the lack of ability to do this is a Qt bug or if I am simply using it wrong.

Here is a (minimal) code snippet to illustrate the issue:

    qtApp = new QApplication(qtArgc, qtArgv);
    
    // NSWindow
    NSWindow* window  = [[NSWindow alloc] initWithContentRect:NSMakeRect(500, 500, 500, 500)
      styleMask:NSTitledWindowMask |  NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask
      backing:NSBackingStoreBuffered
      defer:NO];
    
    // NSView
    NSView *view = [[NSView alloc] initWithFrame:NSMakeRect(200, 200, 200, 200)];
    
    // Widgets
    QMacNativeWidget *nativeWidget = new QMacNativeWidget();
    nativeWidget->setPalette(QPalette(Qt::red));
    nativeWidget->setAutoFillBackground(true);
    QVBoxLayout *layout = new QVBoxLayout();
    QPushButton *pushButton = new QPushButton("Button", nativeWidget);
    layout->addWidget(pushButton);
    nativeWidget->setLayout(layout);
    
    // Add Native Widget To NSView Before Adding NSView To NSWindow (This Doesn't Work)
    [view addSubview:nativeWidget->nativeView()];
    nativeWidget->show();
    
    // Add NSView To NSWindow
    [view setWantsLayer:YES];
    [window.contentView addSubview:view];
    
    // Add Native Widget To NSView After Adding NSView To NSWindow (This Works)
    // [view addSubview:nativeWidget->nativeView()];
    // nativeWidget->show();
    
    [window makeKeyAndOrderFront:window];

Thanks

[inhwan]

Perhaps one solution is to call exposeWindow() on viewDidMoveToWindow() every time by removing the "if (!_q_NSWindowDidChangeOcclusionStateNotification && m_isMenuView)" check? (Note: This is in qsnview.mm)

- (void)viewDidMoveToWindow
{
    m_backingStore = Q_NULLPTR;
    m_isMenuView = [self.window.className isEqualToString:@"NSCarbonMenuWindow"];
    if (self.window) {
        // This is the case of QWidgetAction's generated QWidget inserted in an NSMenu.
        // 10.9 and newer get the NSWindowDidChangeOcclusionStateNotification
        if (!_q_NSWindowDidChangeOcclusionStateNotification && m_isMenuView) { // Remove This?
            m_exposedOnMoveToWindow = true;
            m_platformWindow->exposeWindow();
        }
    } else if (m_exposedOnMoveToWindow) {
        m_exposedOnMoveToWindow = false;
        m_platformWindow->obscureWindow();
    }
}