Child QGraphicsItem setToolTip does not override parent QGraphicsItem's tooltip

[philw]

Thank you Franz. I did use the work "override" -- but I didn't mean that in the sense of C++ virtual methods. I'm not attempting to redefine QGraphicsItem::setToolTip() in any of my classes.

I just want the child QGraphicsItem's "setToolTip" call to PREVAIL over the containing (parent's) "setToolTip" call when the mouse pointer is over the child QGraphicsItem.

I did also make sure that the child QGraphicsItem had a higher "Z" value than the parent QGraphicsItem -- that didn't help. Only the tooltip text set by the parent's setToolTip call ever shows up.

[wysota]

Please provide a minimal compilable example reproducing the problem.

[philw]

Well, QToolTips ARE working as desired in a simple example of nested QGraphicsItems. (See also screenshot of this example, below). I don't yet know why this isn't working in the context of our large application. THIS DOES WORK:

// File: testGraphicItems.cpp
 
#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsRectItem>
#include <QGraphicsTextItem>
#include <ostream>
 
int main(int argc, char** argv)
{
   QApplication app (argc, argv);
   QGraphicsScene myScene;
 
   // *******************************************
   // ***  Create Outer Parent QGraphicsItem  ***
   // *******************************************
 
   QGraphicsRectItem* outerParentItem =
      new QGraphicsRectItem (-180.0, -70.0, 360.0, 140.0);
 
   outerParentItem->setToolTip ("Parent Item ToolTip");
   outerParentItem->setFlags (QGraphicsItem::ItemIsMovable   |
                              QGraphicsItem::ItemIsSelectable);
 
   myScene.addItem (outerParentItem);
 
   // *******************************************
   // ***  Create Inner Parent QGraphicsItem  ***
   // *******************************************
 
   QGraphicsRectItem* innerParentItem =
      new QGraphicsRectItem (-140.0, -45.0, 280.0, 90.0, outerParentItem);
 
   // ************************************
   // ***  Create Child QGraphicsItem  ***
   // ************************************
 
   QGraphicsTextItem* childItem =
      new QGraphicsTextItem ("Child QGraphicsTextItem", innerParentItem);
 
   const QRectF childRect = childItem->boundingRect();
   childItem->setPos (-0.5 * childRect.width(), -0.5 * childRect.height());
 
   childItem->setToolTip ("Child Item ToolTip");
 
   // ******************************
   // ***  Create QGraphicsView  ***
   // ******************************
 
   QGraphicsView myView (&myScene);
   myView.setCaption ("Test Nested QGraphicsItems ToolTips");
   myView.setAttribute (Qt::WA_AlwaysShowToolTips);
   myView.resize (420, 200);
   myView.show();
 
   return app.exec();
}
 
//--- (end testGraphicItems.cpp) ---

// File: testGraphicItems.cpp

#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsRectItem>
#include <QGraphicsTextItem>
#include <ostream>

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

   // *******************************************
   // ***  Create Outer Parent QGraphicsItem  ***
   // *******************************************

   QGraphicsRectItem* outerParentItem =
      new QGraphicsRectItem (-180.0, -70.0, 360.0, 140.0);

   outerParentItem->setToolTip ("Parent Item ToolTip");
   outerParentItem->setFlags (QGraphicsItem::ItemIsMovable   |
                              QGraphicsItem::ItemIsSelectable);

   myScene.addItem (outerParentItem);

   // *******************************************
   // ***  Create Inner Parent QGraphicsItem  ***
   // *******************************************

   QGraphicsRectItem* innerParentItem =
      new QGraphicsRectItem (-140.0, -45.0, 280.0, 90.0, outerParentItem);

   // ************************************
   // ***  Create Child QGraphicsItem  ***
   // ************************************

   QGraphicsTextItem* childItem =
      new QGraphicsTextItem ("Child QGraphicsTextItem", innerParentItem);

   const QRectF childRect = childItem->boundingRect();
   childItem->setPos (-0.5 * childRect.width(), -0.5 * childRect.height());

   childItem->setToolTip ("Child Item ToolTip");

   // ******************************
   // ***  Create QGraphicsView  ***
   // ******************************

   QGraphicsView myView (&myScene);
   myView.setCaption ("Test Nested QGraphicsItems ToolTips");
   myView.setAttribute (Qt::WA_AlwaysShowToolTips);
   myView.resize (420, 200);
   myView.show();

   return app.exec();
}

//--- (end testGraphicItems.cpp) ---

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Here is a screenshot -- without showing the QToolTip. (That's a little tricky to capture using our X11 setup):



BaseOK.gif

Thank you.

[wysota]

An example of working code is very unlikely to help us see the problem in the code that doesn't work.

[philw]

An example of working code is very unlikely to help us see the problem in the code that doesn't work.

Yes, of course. I just wanted to share this confirmation that Qt 4.6.3 IS working as I had hoped, in this particular respect. I'll take it from here. Thank you.

[franz]

Good to see you've solved the issue.