Is there a way to find when resize is done??

Hi,

Is there any signal or a way to check when resize is complete for QWidget?
Actually I want to stop the drawing on my map control when it is being resized and then start it again once the resize is complete.

Regards,
Raj

Quote:

---

Is there any signal or a way to check when resize is complete for QWidget?

---

Try reimplement QWidget::resizeEvent or using QObject::eventFilter.

When do you consider the resize "complete"?

You can do something like this, which stops the widget's layout from updating until there has been no resize event for a configurable time:

Code:

---

#include <QtGui>
#include <QDebug>
 
class LazyResizeWidget: public QWidget
{
    Q_OBJECT
public:
    LazyResizeWidget(QWidget *p = 0): QWidget(p) 
    {
        m_timer = new QTimer(this);
        m_timer->setSingleShot(true);
        connect(m_timer, SIGNAL(timeout()), SLOT(resizeStopped()));
 
        // Just for example content
        QFrame *f = new QFrame(this);
        f->setFrameStyle(QFrame::Plain | QFrame::Box);
        QVBoxLayout *l = new QVBoxLayout(this);
        l->addWidget(f);
        setLayout(l);
    }
 
protected:
    void resizeEvent(QResizeEvent *event)
    {
        QLayout *l = layout();
        if (l) {
            m_timer->start(StoppedTimeout);
            l->setEnabled(false);
        }
        QWidget::resizeEvent(event);
    }
 
private slots:
    void resizeStopped()
    {
        QLayout *l = layout();
        if (l) {
            l->setEnabled(true);
            l->update();
        }
    }
 
private:
    enum { StoppedTimeout = 500 };    
    QTimer *m_timer;
};
 
 
int main(int argc, char**argv)
{
    QApplication app(argc, argv);
    LazyResizeWidget w;
    w.resize(640, 480);
    w.show();
    return app.exec();
}
 
#include "main.moc"

---

Quote:

---

Originally Posted by rajji_saini

Is there any signal or a way to check when resize is complete for QWidget?
Actually I want to stop the drawing on my map control when it is being resized and then start it again once the resize is complete.

---

Do you mean when the user is resizing the window (by dragging an edge or a corner)?

If so, and if the target platform is Windows, what you need are the WM_ENTERSIZEMOVE and WM_EXITSIZEMOVE messages. I don’t have a good opportunity to test right now, but if QWidget::winEvent gets those messages, you should be able to use them to do what you need.

Thanks Coises ...