resize qdockwidget through embedded widget

[codeman]

Hello friends,

I have a question. I add a QWidget into a QDockwidget. How can I resize(the width) from dockwidget, when I resize the QWidget in it??

Yours,

[ChrisW67]

Your question is unclear: do you want to resize the dock widget and have the contents resize, or do you want to resize the dock widget to fit the content you put in it.

[codeman]

When I resize the embedded widget in its EnterEvent I resize it but the QDockwidget, which operate here as container for my widget dont resize it self.Thats my point.

Yours,

[ChrisW67]

The size of the dock widget container resizes to accommodate its content when that content imposes a constraint that would require it to: in all other cases the container sets the size of its content. The constraint will come from the contained widget's layout, minimum and maximum size, size hint, and size policy. Your best bet is to give your contained widget's layout a QLayout::SetFixedSize size constraint.

#include <QtGui>
#include <QDebug>
 
 
class MorphingWidget: public QWidget {
    Q_OBJECT
public:
    MorphingWidget(QWidget *p = 0): QWidget(p) {
        QVBoxLayout *layout = new QVBoxLayout(this);
        layout->setSizeConstraint(QLayout::QLayout::SetFixedSize); // try with/without this
 
        top = new QPushButton("Top Button", this);
        layout->addWidget(top);
 
        bottom = new QPushButton("Bottom Button Long", this);
        bottom->hide();
        layout->addWidget(bottom);
    }
protected:
    void enterEvent ( QEvent * event ) { bottom->show(); QWidget::enterEvent(event); }
    void leaveEvent ( QEvent * event ) { bottom->hide(); QWidget::leaveEvent(event); }
private:
    QPushButton *top;
    QPushButton *bottom;
};
 
class MainWindow: public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        QWidget *central = new QTextEdit(this);
        setCentralWidget(central);
 
        QDockWidget *dock = new QDockWidget(this);
        dock->setWidget(new MorphingWidget(this));
        addDockWidget(Qt::RightDockWidgetArea, dock);
 
        resize(640, 480);
    }
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow m;
    m.show();
    return app.exec();
}
#include "main.moc"

#include <QtGui>
#include <QDebug>


class MorphingWidget: public QWidget {
    Q_OBJECT
public:
    MorphingWidget(QWidget *p = 0): QWidget(p) {
        QVBoxLayout *layout = new QVBoxLayout(this);
        layout->setSizeConstraint(QLayout::QLayout::SetFixedSize); // try with/without this

        top = new QPushButton("Top Button", this);
        layout->addWidget(top);

        bottom = new QPushButton("Bottom Button Long", this);
        bottom->hide();
        layout->addWidget(bottom);
    }
protected:
    void enterEvent ( QEvent * event ) { bottom->show(); QWidget::enterEvent(event); }
    void leaveEvent ( QEvent * event ) { bottom->hide(); QWidget::leaveEvent(event); }
private:
    QPushButton *top;
    QPushButton *bottom;
};

class MainWindow: public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        QWidget *central = new QTextEdit(this);
        setCentralWidget(central);

        QDockWidget *dock = new QDockWidget(this);
        dock->setWidget(new MorphingWidget(this));
        addDockWidget(Qt::RightDockWidgetArea, dock);

        resize(640, 480);
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow m;
    m.show();
    return app.exec();
}
#include "main.moc"

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[codeman]

Great thanks for your help,

in my situation I am also subclass QWidget.I paint some rects on the widget, and in enter event I change the size of the rects, so I make a repaint, resize the widget and the Dockwidget make nothing. I dont have any layout in there.

Maybe I have to give a pointer of the Dockwidget to the childwidget and make a setFixedWidth or so!!

Yours,