Text interaction with QGraphicsTextItem in multiple scenes and views

[joekemp]

I have multiple QGraphicsView items, each shown in a tab of an QTabWidget. Each view has its own QGraphicsScene.

I have a problem with QGraphicsTextItem items in all views created after the first one. The problem is when I attempt to edit them - I have no text caret and the dashed border is also absent. However, I can still edit the item.

I have reproduced the issue in the code below:

MainWindow::MainWindow(QWidget *parent, Qt::WFlags flags) :
  QMainWindow(parent, flags)
{
	ui.setupUi(this);
	connect(ui.actionNew, SIGNAL(triggered()), this, SLOT(newTab()));
}
 
void MainWindow::newTab()
{
	QGraphicsScene* scene = new QGraphicsScene(this);
 
	QGraphicsTextItem* item = new QGraphicsTextItem("Hello World!");
	item->setTextInteractionFlags(Qt::TextEditorInteraction);
	scene->addItem(item);
 
	QGraphicsView* view = new QGraphicsView(scene, ui.tabWidget);
	ui.tabWidget->addTab(view, "Scene");
}

MainWindow::MainWindow(QWidget *parent, Qt::WFlags flags) :
  QMainWindow(parent, flags)
{
	ui.setupUi(this);
	connect(ui.actionNew, SIGNAL(triggered()), this, SLOT(newTab()));
}

void MainWindow::newTab()
{
	QGraphicsScene* scene = new QGraphicsScene(this);

	QGraphicsTextItem* item = new QGraphicsTextItem("Hello World!");
	item->setTextInteractionFlags(Qt::TextEditorInteraction);
	scene->addItem(item);

	QGraphicsView* view = new QGraphicsView(scene, ui.tabWidget);
	ui.tabWidget->addTab(view, "Scene");
}

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Interestingly, if I call newTab() multiple times inside the MainWindow's constructor, each view behaves as expected without the issue. However, all subsequent tabs suffer from text editing issue.

Thanks in advance for any help anyone can give me. All files attached below.

main.cpp
MainWindow.ui
MainWindow.h
MainWindow.cpp

[joyer83]

According to QTabWidget's documentation you're not supposed to give a parent for widgets which you add as tabs to it.
So, try this if it might help:

QGraphicsView* view = new QGraphicsView(scene /*, ui.tabWidget*/ );

QGraphicsView* view = new QGraphicsView(scene /*, ui.tabWidget*/ );

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[joekemp]

Thanks joyer. Doesn't seem to fix the problem. I think it is the bug below:
http://bugreports.qt.nokia.com/browse/QTBUG-18961

Anybody have an idea how I can fix it as the software I am working on needs to be released soon?

[stampede]

Which Qt version are you using ? This bug seems to affect version 4.7.0, maybe you can just downgrade to 4.6.x ?

[joekemp]

Hi stampede. I'm using version 4.7.1. I tried version 4.6.3 as you recommended, but the bug is still there.