[Solved] QGraphicsPixmapItem && QGraphicsGridLayout

luca

Hi all,

is there a way to put some QGraphicsPixmapItem in a grid?

In QT 4.6 documentation there is a QGraphicsGridLayout example:

@
QGraphicsScene scene;
QGraphicsWidget *textEdit = scene.addWidget(new QTextEdit);
QGraphicsWidget *pushButton = scene.addWidget(new QPushButton);

QGraphicsGridLayout *layout = new QGraphicsGridLayout;
layout->addItem(textEdit, 0, 0);
layout->addItem(pushButton, 0, 1);

QGraphicsWidget *form = new QGraphicsWidget;
form->setLayout(layout);
scene.addItem(form);
@

but it use a QGraphicsWidget and I need to use a QGraphicsPixmapItem to show some pixmap in a grid.

iunknwn

try this: layout->addItem(graphicsPixmapItem->parentWidget(), 0, 2); //if you are using QT 4.4+

iunknwn

Well said it too early without trying. I don't think there is a direct way to use QGraphicsGridLayout for QGraphicsPixmapItem. It is for QGraphicWidgets only.

May be you can determine view/scene size calculate positions on the fly and position them accordingly in the scene.

luca

Thanks,

Now I'm trying the example I posted before:

@
QGraphicsScene scene;
QGraphicsWidget *textEdit = scene.addWidget(new QTextEdit);
QGraphicsWidget *pushButton = scene.addWidget(new QPushButton);

QGraphicsGridLayout *layout = new QGraphicsGridLayout;
layout->addItem(textEdit, 0, 0);
layout->addItem(pushButton, 0, 1);

QGraphicsWidget *form = new QGraphicsWidget;
form->setLayout(layout);
scene.addItem(form);
@

but I get a compiling error:

@
error: cannot convert 'QGraphicsProxyWidget*' to 'QGraphicsWidget*' in assignment
@

and it refer to the line:

@
QGraphicsWidget *textEdit = scene.addWidget(new QTextEdit);
@

What is the problem?

iunknwn

add

@#include <QtGui>@

or

specifically you are missing:

@#include <QtGui/QGraphicsProxyWidget>@

Below find full working example
@
#include <QtGui/QApplication>
#include <QtGui/QGraphicsProxyWidget>
#include <QtGui/QGraphicsScene>
#include <QtGui/QTextEdit>
#include <QtGui/QPushButton>
#include <QtGui/QGraphicsGridLayout>
#include <QtGui/QGraphicsView>

int main(int argc, char **argv)
{
QApplication app(argc, argv);

QGraphicsScene scene;
QGraphicsWidget *textEdit = scene.addWidget(new QTextEdit);
QGraphicsWidget *pushButton = scene.addWidget(new QPushButton);

QGraphicsGridLayout *layout = new QGraphicsGridLayout;
layout->addItem(textEdit, 0, 0);
layout->addItem(pushButton, 0, 1);

QGraphicsWidget *form = new QGraphicsWidget;
form->setLayout(layout);
scene.addItem(form);

QGraphicsView view(&scene);
view.show();

return app.exec();
}

@

luca

Ok, thanks and sorry for the stupid question, it solved... :-)

Now I'm trying to put my pixmap in a QLabel and the use the same way of the example.

I'll tell you if it works...

iunknwn

QLabel with QPixmaps laied out with QGraphicsGridLayout would do the trick and would definitely work. Threre is not need to do QGraphicsPixmapItem.

luca

The new solution works!

@
QGraphicsGridLayout *ggl = new QGraphicsGridLayout;
QPixmap pixmap1;
QPixmap pixmap2;
...
QLabel *pixmap_widget = new QLabel;
pixmap_widget->setPixmap(pixmap1);
QGraphicsProxyWidget *pixmap_graphics_widget1 = graphicsScene->addWidget(pixmap_widget);
pixmap_widget = new QLabel;
pixmap_widget->setPixmap(pixmap2);
QGraphicsProxyWidget *pixmap_graphics_widget2 = graphicsScene->addWidget(pixmap_widget);
ggl->addItem(pixmap_graphics_widget1,0,0);
ggl->addItem(pixmap_graphics_widget2,0,1);
QGraphicsWidget *form = new QGraphicsWidget;
form->setLayout(ggl);
graphicsScene->addItem(form);
@

luca

Thanks for your help!