Saving a FULLY rendered QWidget on a graphics scene

[technoViking]

Hi,

I have several widgets in a graphics scene. I want to take a image copy of 1 of the widgets.

I attempted the following:

QPixmap screenshot;
screenshot = QPixmap::grabWidget(theWidget,theWidget.rect());
screenshot.save("test.png","PNG");

QPixmap screenshot;
screenshot = QPixmap::grabWidget(theWidget,theWidget.rect());
screenshot.save("test.png","PNG");

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THis will save the widget but the widget is stripped of EVERYHTING. Basically you don't see the background image on the widget, you don't see any alpha settings I set, you simply see an outline of the widget and some text.

I also tried:

QImage image(300,300,QImage::Format_RGB32);
QPainter painter(&image);
 
TheGraphicsView->render(&painter);
image.save("test.png","PNG");

QImage image(300,300,QImage::Format_RGB32);
QPainter painter(&image);

TheGraphicsView->render(&painter);
image.save("test.png","PNG");

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This will give me the exact same result as above.


Lastly I tried:

screenshot = QPixmap::grabWindow(QApplication::desktop()->winId());

screenshot = QPixmap::grabWindow(QApplication::desktop()->winId());

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This will capture the whole screen which is not what I wanted. This will though show everyhting fully rendered.

Any ideas how I can capture just 1 WIDGET in the graphics view fully rendered?

Thanks

[wysota]

QPixmap px(QRect(QPoint(0,0), theWidget->sceneRect().size());
QPainter painter(&px);
scene->render(&painter, QRectF(), theWidget->sceneRect());

QPixmap px(QRect(QPoint(0,0), theWidget->sceneRect().size());
QPainter painter(&px);
scene->render(&painter, QRectF(), theWidget->sceneRect());

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[technoViking]

Hi thanks for the responce! But QWdiget doesn't have a member sceneRect() it does have a ->rect() function though, is that what you meant?

QPixmap px(QRect(QPoint(0,0), mpCalendarWidget->rect().size()));
        QPainter painter(&px);
        this->escapeGraphicsScene->render(&painter,QRectF(),mpCalendarWidget->rect().size());

QPixmap px(QRect(QPoint(0,0), mpCalendarWidget->rect().size()));
        QPainter painter(&px);
        this->escapeGraphicsScene->render(&painter,QRectF(),mpCalendarWidget->rect().size());

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I get an error saying:
error: no matching function for call to QPixmap::Qpixmap(QRect)

Another error saying:
No matching function call to QGraphicsScence::render(QPainter*,QRectF,QSize)

The error is on the first line, I guess the constructor for QPixmap dosen't support QRect.


EDIT:
I changed the code to the following:

QPixmap px(mpCalendarWidget->rect().size());
        QPainter painter(&px);
        this->TheGraphicsScene->render(&painter,QRectF(),mpCalendarWidget->rect());
 
QLabel *mpImageLabel = new QLabel(this);
        mpImageLabel->setPixmap(px);
        mpImageLabel->show();

QPixmap px(mpCalendarWidget->rect().size());
        QPainter painter(&px);
        this->TheGraphicsScene->render(&painter,QRectF(),mpCalendarWidget->rect());

QLabel *mpImageLabel = new QLabel(this);
        mpImageLabel->setPixmap(px);
        mpImageLabel->show();

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It compiles but when I run the application nothing is shown except a black box in the corner of the screen. Am I doing something wrong?

Thanks

[wysota]

Is "mpCalendarWidget" inserted into the scene or is it just some widget floating over the view?

[technoViking]

Hi,

yes its in the scene, I have code here:

GraphicsScene = new QGraphicsScene( QRect( 0, 0, GraphicsView->width(), GraphicsView->height()) );
 
        GraphicsView->setScene(GraphicsScene);
 
        mpCalendarWidget = new CldrWidget(mpStateMachine);
 
        mpCalendarWidgetProxy = GraphicsScene->addWidget(mpCalendarWidget);
        mpCalendarWidget->setGeometry((gLCDhres-mpCalendarWidget->width())/2,
                                      mpMainButtonTray->y()-mpCalendarWidget->height(),
                                      mpCalendarWidget->width(),
                                      mpCalendarWidget->height());

GraphicsScene = new QGraphicsScene( QRect( 0, 0, GraphicsView->width(), GraphicsView->height()) );

        GraphicsView->setScene(GraphicsScene);

        mpCalendarWidget = new CldrWidget(mpStateMachine);

        mpCalendarWidgetProxy = GraphicsScene->addWidget(mpCalendarWidget);
        mpCalendarWidget->setGeometry((gLCDhres-mpCalendarWidget->width())/2,
                                      mpMainButtonTray->y()-mpCalendarWidget->height(),
                                      mpCalendarWidget->width(),
                                      mpCalendarWidget->height());

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[wysota]

So "mpCalendarWidget" from my code is "mpCalendarWidgetProxy" from yours.

[technoViking]

Hi,

Thanks for the responce! I think we almost got it! But still not able to compile what you gave or perhaps I'm misunderstanding.
So I attempted:

QPixmap px(QRect(QPoint(0,0),mpCalendarWidgetProxy->sceneBoundingRect().size() ));   //note:  ProxyWidget doesn't have a member called scenceRect so I figured you meant sceneBoundingRect
 
 QPainter painter(&px);
 this->GraphicsScene->render(&painter,QRectF(),mpCalendarWidgetProxy->sceneBoundingRect());   //note: also used boundingRect here as well since no scenceRect could be found.

QPixmap px(QRect(QPoint(0,0),mpCalendarWidgetProxy->sceneBoundingRect().size() ));   //note:  ProxyWidget doesn't have a member called scenceRect so I figured you meant sceneBoundingRect

 QPainter painter(&px);
 this->GraphicsScene->render(&painter,QRectF(),mpCalendarWidgetProxy->sceneBoundingRect());   //note: also used boundingRect here as well since no scenceRect could be found.

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I got the follow error:
no matching function call to 'QRect::QRect(QPoint,QSizeF)'
So it looks like this line: QPixmap px(QRect(QPoint(0,0),mpCalendarWidgetProxy->sceneBoundingRect().size() )); is the issue

[wysota]

QSizeF::toSize()