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Code: Alles auswählen

class Map : public QLabel
{
   Q_OBJECT

public:
   Map(QLabel* parent = 0);

[...]

protected:
    virtual void paintEvent(QPaintEvent*);
    virtual void resizeEvent(QResizeEvent*);
    virtual void mousePressEvent(QMouseEvent*);
    virtual void mouseReleaseEvent(QMouseEvent*);
    virtual void mouseMoveEvent(QMouseEvent*);
    virtual void mouseDoubleClickEvent(QMouseEvent*);

[...]
};

Map::Map(QObject* parent)
    : QLabel(parent)
{
    [...]
    setMouseTracking(true);
}

Code: Alles auswählen

class MainWindow : public QMainWindow
{
    Q_OBJECT

    friend class MapEventFilter;

public:
    MainWindow(QObject* parent = 0);

    [...]
    Map* mapWidget() const;

private:
    Map* mMap;

    [...]

    MapEventFilter* mMapFilter;
};

MainWindow::MainWindow
    : QMainWindow(parent)
{
    [...]
    mMapFilter = new MapEventFilter(this);
   
    // create map widget
    mMap = new Map(this);
    // install event filter
    mMap->installEventFilter(mMapFilter);
    [...]
}

Code: Alles auswählen

class MapEventFilter : public QObject
{
public:
    MapEventFilter(MainWindow* mw, QObject* parent = 0);

protected:
    bool eventFilter(QObject* dist, QEvent* e);

private:
    MainWindow* mMainWindow;
    Qt::MouseButton mLastButton;
    QPointF mLastMousePos;
    [...]
};
MapEventFilter::MapEventFilter(MainWindow* mw, QObject* parent)
    : mMainWindow(mw), QObject(parent)
{
}

bool MapEventFilter::eventFilter(QObject* dist, QEvent* e)
{
    switch (e->>type())
    {
    case QEvent::MouseButtonPress:
        {
            QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(e);
            
            switch(mMainWindow->mouseMode())
            {
             case MainWindow::MM_Info:
                 // show info of items
                 mMainWindow->showInfo(mouseEvent->pos());
              [...]
          }
          return true;
      case QEvent::MouseButtonRelease:
          [...]
      case QEvent::MouseMove:
           {
                QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(e);
                mMousePos = mouseEvent->pos();
                updateStatusBar(mMousePos);
            }
            return true;
    }
    return QObject::eventFilter(dist, e);
}

Code: Alles auswählen

return true