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    Unsolved Adding QMacNativeWidget to a NSView without an NSWindow

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    • I
      inhwan last edited by 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

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      • I
        inhwan last edited by 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();
            }
        }
        
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