Mouse events with StackAll QStackedLayout

[grin]

see answer of Thierry Bastian for https://bugreports.qt.nokia.com/browse/QTBUG-3868

Only the current page is active. The button on the other page just appears there because your current page is not opaque. That doesn't mean that it is transparent to mouse events.

So you can capture mouse events at mainWidget and send it to needed control (according with mouse position) - but this way assume that you have pointer to all needed control at all stack. The following code show example:

#include <QtGui>
class CMainWidget : public QWidget
{
    QPushButton*m_video_but;
public:
    CMainWidget(QWidget*parent=0):QWidget(parent)
    {
        setMouseTracking(true);
        QStackedLayout*stack = new QStackedLayout(this);
        stack->setStackingMode(QStackedLayout::StackAll);
        QWidget*video_widget = new QWidget;
        QVBoxLayout*v_layout = new QVBoxLayout(video_widget);
        m_video_but = new QPushButton("Video");
        v_layout->addWidget(m_video_but);
        v_layout->addStretch();
        stack->addWidget(video_widget);
        QWidget*control_widget = new QWidget;
        v_layout = new QVBoxLayout(control_widget);
        v_layout->addStretch();
        v_layout->addWidget(new QPushButton("Controls"));
        stack->addWidget(control_widget);
        stack->setCurrentWidget(m_control_widget);
    }
private:
    void mouseEvent(QMouseEvent*ev)
    {
        if(m_video_but->rect().contains(ev->pos()))
            qApp->sendEvent(m_video_but,ev);
    }
    void mousePressEvent(QMouseEvent*ev) { mouseEvent(ev); }
    void mouseReleaseEvent(QMouseEvent*ev) { mouseEvent(ev); }
    void mouseDoubleClickEvent(QMouseEvent*ev) { mouseEvent(ev); }
};
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    CMainWidget w;
    w.show();
    return a.exec();
}

#include <QtGui>
class CMainWidget : public QWidget
{
    QPushButton*m_video_but;
public:
    CMainWidget(QWidget*parent=0):QWidget(parent)
    {
        setMouseTracking(true);
        QStackedLayout*stack = new QStackedLayout(this);
        stack->setStackingMode(QStackedLayout::StackAll);
        QWidget*video_widget = new QWidget;
        QVBoxLayout*v_layout = new QVBoxLayout(video_widget);
        m_video_but = new QPushButton("Video");
        v_layout->addWidget(m_video_but);
        v_layout->addStretch();
        stack->addWidget(video_widget);
        QWidget*control_widget = new QWidget;
        v_layout = new QVBoxLayout(control_widget);
        v_layout->addStretch();
        v_layout->addWidget(new QPushButton("Controls"));
        stack->addWidget(control_widget);
        stack->setCurrentWidget(m_control_widget);
    }
private:
    void mouseEvent(QMouseEvent*ev)
    {
        if(m_video_but->rect().contains(ev->pos()))
            qApp->sendEvent(m_video_but,ev);
    }
    void mousePressEvent(QMouseEvent*ev) { mouseEvent(ev); }
    void mouseReleaseEvent(QMouseEvent*ev) { mouseEvent(ev); }
    void mouseDoubleClickEvent(QMouseEvent*ev) { mouseEvent(ev); }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    CMainWidget w;
    w.show();
    return a.exec();
}

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The other way not use stack layout the following code illustrate it:

#include <QtGui>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    QWidget mainWidget;
    mainWidget.setFixedSize(150,80);
 
    QHBoxLayout*h_layout = new QHBoxLayout(&mainWidget);
    h_layout->setMargin(10);
    h_layout->setSpacing(10);
 
    QPushButton*but_left = new QPushButton("LEFT");
    but_left->setFixedSize(60,60);
    QPushButton*but_right = new QPushButton("RIGHT");
    but_right->setFixedSize(but_left->size());
    mainWidget.layout()->addWidget(but_left);
    mainWidget.layout()->addWidget(but_right);
 
    //NOTE: important that widget, which isn't in layout was a child of main widget
    // also overlay shall be added to mainWidget child's list after it's layout
    QPushButton*but_overlay = new QPushButton("overlay",&mainWidget);
    but_overlay->setFixedSize(40,20);
    QFont font;
    font.setPixelSize(6);
    but_overlay->setFont(font);
    but_overlay->move(55,30); //at center of main widget;
 
    mainWidget.show();
    return a.exec();
}

#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QWidget mainWidget;
    mainWidget.setFixedSize(150,80);

    QHBoxLayout*h_layout = new QHBoxLayout(&mainWidget);
    h_layout->setMargin(10);
    h_layout->setSpacing(10);

    QPushButton*but_left = new QPushButton("LEFT");
    but_left->setFixedSize(60,60);
    QPushButton*but_right = new QPushButton("RIGHT");
    but_right->setFixedSize(but_left->size());
    mainWidget.layout()->addWidget(but_left);
    mainWidget.layout()->addWidget(but_right);

    //NOTE: important that widget, which isn't in layout was a child of main widget
    // also overlay shall be added to mainWidget child's list after it's layout
    QPushButton*but_overlay = new QPushButton("overlay",&mainWidget);
    but_overlay->setFixedSize(40,20);
    QFont font;
    font.setPixelSize(6);
    but_overlay->setFont(font);
    but_overlay->move(55,30); //at center of main widget;

    mainWidget.show();
    return a.exec();
}

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