Rotate QGraphicsProxyWidget in QGraphicsView

[volcano]

Hi,

I have a QPushButton on a QGraphicsProxyWidget. However when I rotate the proxy widget, the widget rotates but the rotation of the button is cannot be seen. Is it possible to rotate the QPushButton to appear rotated say at an angle of -20.

QGraphicsView view(&scene);
 
    view.setRenderHint(QPainter::Antialiasing);
    view.setDragMode(QGraphicsView::ScrollHandDrag);
 
    QPushButton *btn = new QPushButton("My Button");
    QGraphicsProxyWidget *pw = scene.addWidget(wi);
    pw->setPos(100, 100);
    pw->setRotation(-20);

QGraphicsView view(&scene);

    view.setRenderHint(QPainter::Antialiasing);
    view.setDragMode(QGraphicsView::ScrollHandDrag);

    QPushButton *btn = new QPushButton("My Button");
    QGraphicsProxyWidget *pw = scene.addWidget(wi);
    pw->setPos(100, 100);
    pw->setRotation(-20);

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Any pointer would be of great help.
Thanks

[MarkoSan]

Use QPropertyAnimation

[wysota]

Shouldn't you be using "btn" instead of "wi" in the call to scene.addWidget()?

[volcano]

Sorry I forgot to mention about the following. The wi is defined as follows

QWidget *wi = new QWidget;
    QVBoxLayout *lay = new QVBoxLayout;
    lay->addWidget(new QPushButton("Hello"));
    lay->addStretch();
    wi->setLayout(lay);
    QGraphicsScene scene;
    scene.setSceneRect(0, 0, 500, 500);
 
    QGraphicsView view(&scene);
 
    view.setRenderHint(QPainter::Antialiasing);
    view.setDragMode(QGraphicsView::ScrollHandDrag);
 
    QGraphicsProxyWidget *pw = scene.addWidget(wi);
    pw->setPos(100, 100);
    pw->setRotation(-20);

QWidget *wi = new QWidget;
    QVBoxLayout *lay = new QVBoxLayout;
    lay->addWidget(new QPushButton("Hello"));
    lay->addStretch();
    wi->setLayout(lay);
    QGraphicsScene scene;
    scene.setSceneRect(0, 0, 500, 500);

    QGraphicsView view(&scene);

    view.setRenderHint(QPainter::Antialiasing);
    view.setDragMode(QGraphicsView::ScrollHandDrag);

    QGraphicsProxyWidget *pw = scene.addWidget(wi);
    pw->setPos(100, 100);
    pw->setRotation(-20);

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[faldzip]

Can you provide compilable example, because it is hard to understand what yo want to do. Once you are making a button and NOT adding it to any scene and you are rotating another widget which has nothing common with this button, so, as it can be expected, the button is not rotated... In you last post you have widget with button but it looks strange that you create scene and graphics view on a stack instead of heap, so where do you have this code? in main() function?

[volcano]

Yes the code is present in the main.

The problem faced is that the button rotates but the view of the button doesn't.

[wysota]

What do you mean by "the view of the button"? How about providing an image mockup of "what is" and "what should be"?

[volcano]

Attached what's happening ans what is required

[wysota]

And what about a complete code you used to obtain it? When I run my code, I get the required output

[faldzip]

I just made my complete working code:

#include <QtCore>
#include <QtGui>
 
int main(int argc, char **argv)
{
	QApplication a(argc, argv);
	QGraphicsView gv;
	QGraphicsScene scene(-200,-200,400,400);
	gv.setScene(&scene);
	gv.setRenderHint(QPainter::Antialiasing);
	gv.setDragMode(QGraphicsView::ScrollHandDrag);
 
	QWidget wi;
	QVBoxLayout lo;
	QPushButton btn("My Button", &wi);
	lo.addWidget(&btn);
	wi.setLayout(&lo);
	QGraphicsProxyWidget *pw = scene.addWidget(&wi);
	pw->setPos(0, 0);
	pw->setRotation(-20);
	gv.show();
	return a.exec();
}

#include <QtCore>
#include <QtGui>

int main(int argc, char **argv)
{
	QApplication a(argc, argv);
	QGraphicsView gv;
	QGraphicsScene scene(-200,-200,400,400);
	gv.setScene(&scene);
	gv.setRenderHint(QPainter::Antialiasing);
	gv.setDragMode(QGraphicsView::ScrollHandDrag);

	QWidget wi;
	QVBoxLayout lo;
	QPushButton btn("My Button", &wi);
	lo.addWidget(&btn);
	wi.setLayout(&lo);
	QGraphicsProxyWidget *pw = scene.addWidget(&wi);
	pw->setPos(0, 0);
	pw->setRotation(-20);
	gv.show();
	return a.exec();
}

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And what I get is on the screenshot. Am I missing something in my code?
EDIT:
The button is only displayed correctly when the Aero highlighting animation takes place on hover (when finished it is displayed wrong again)

[wysota]

What if you get rid of the "wi" widget and the layout? What if you call rotate() instead of setRotation()?

[faldzip]

#include <QtCore>
#include <QtGui>
 
int main(int argc, char **argv)
{
	QApplication a(argc, argv);
	QGraphicsView gv;
	QGraphicsScene scene(-200,-200,400,400);
	gv.setScene(&scene);
	gv.setRenderHint(QPainter::Antialiasing);
    gv.setDragMode(QGraphicsView::ScrollHandDrag);
 
	QPushButton btn("My Button");
    QGraphicsProxyWidget *pw = scene.addWidget(&btn);
    pw->setPos(0, 0);
    pw->rotate(-20);
    gv.show();
	return a.exec();
}

#include <QtCore>
#include <QtGui>

int main(int argc, char **argv)
{
	QApplication a(argc, argv);
	QGraphicsView gv;
	QGraphicsScene scene(-200,-200,400,400);
	gv.setScene(&scene);
	gv.setRenderHint(QPainter::Antialiasing);
    gv.setDragMode(QGraphicsView::ScrollHandDrag);

	QPushButton btn("My Button");
    QGraphicsProxyWidget *pw = scene.addWidget(&btn);
    pw->setPos(0, 0);
    pw->rotate(-20);
    gv.show();
	return a.exec();
}

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gives:
screen2.jpg

[volcano]

Is there a solution to this problem ?

[wysota]

The solution is to use a widget style different than the native WindowsXP/Vista style. You may also browse the bug tracker to see if this bug was reported and fixed between 4.6.0 and 4.6.1. If so, you can download a patch and apply it to your 4.6.0 sources and rebuild the style. You may also downgrade to Qt 4.5.3

[faldzip]

http://bugreports.qt.nokia.com/browse/QTBUG-5939