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Thread: QMenu's QAction works with QShortcut, not with button

  1. 4th July 2011, 16:51 #1
    Wasabi
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    Default QMenu's QAction works with QShortcut, not with button

    I'm facing an odd problem with a code of mine. I have a menu item "Open File" which has a shortcut Ctrl+C. If I run the program and hit Ctrl+C, the program works like a charm, no problems. However, if I instead go to the menu item and click it, the function itself also works like a charm, but at the end of it, the program crashes. Here's the code:

    Qt Code: 
    1. Canvas::Canvas(const QPoint& Position, const QSize& Size,QWidget* Parent) :
    2. 			   QSFMLCanvas(Parent, Position, Size),
    3. 			   MenuBar(this)
    4. {
    5. 	setMouseTracking(true);
    6. 	setAttribute(Qt::WA_DeleteOnClose);
    7. 	points.reserve(3000);
    8.  
    9. 	EqualizeSize=0;
    10. 	PointsVisible=true;
    11.  
    12. 	QMenu* menu = MenuBar.addMenu("File");
    13. 		menu->addAction("&Open",this,SLOT(OpenFile()),QKeySequence::Open);
    14. 		menu->addAction("&Save",this,SLOT(SaveFile()),QKeySequence::Save);
    15. 		menu->addAction("&Quit",QCoreApplication::instance(),SLOT(quit()),QKeySequence::Quit);
    16. //...
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    The shortcut is never redefined anywhere else in the code (the code above is, in fact, the only time the function OpenFile() is called).

    Am I doing anything wrong here? Why does using "Ctrl+C" work, but using the menu-button crash, at the end of the OpenFile() function? Does the fact that I set the menu ("File") as a temporary variable have anything to do with this?
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  2. 5th July 2011, 02:55 #2
    Wasabi
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    Default Re: QMenu's QAction works with QShortcut, not with button

    Any help please?
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  3. 5th July 2011, 06:11 #3
    Urthas
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    Default Re: QMenu's QAction works with QShortcut, not with button

    You should post the rest of the code.

    By the way, how is it that QKeySequence::Open maps to Ctrl+C for you, and not Ctrl+O per the docs?
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  4. 5th July 2011, 17:31 #4
    Wasabi
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    Default Re: QMenu's QAction works with QShortcut, not with button

    Oh, wow. I meant Ctrl+O, of course. Don't know what happened there.

    Here's the rest of the constructor. I can't post the remainder of the code because, well, its a few thousand lines long. The class Canvas inherits from QWidget and sf::RenderWindow, from the SFML Graphics library.

    Qt Code: 
    1. Canvas::Canvas(const QPoint& Position, const QSize& Size,QWidget* Parent) :
    2. 			   QSFMLCanvas(Parent, Position, Size),
    3. 			   MenuBar(this)
    4. {
    5. 	setMouseTracking(true);
    6. 	setAttribute(Qt::WA_DeleteOnClose);
    7. 	points.reserve(3000);
    8.  
    9. 	EqualizeSize=0;
    10. 	PointsVisible=true;
    11.  
    12. 	QMenu* menu = MenuBar.addMenu("File");
    13. 		menu->addAction("&Open",this,SLOT(OpenFile()),QKeySequence::Open);
    14. 		menu->addAction("&Save",this,SLOT(SaveFile()),QKeySequence::Save);
    15. 		menu->addAction("&Quit",QCoreApplication::instance(),SLOT(quit()),QKeySequence::Quit);
    16. 	menu = MenuBar.addMenu("Edit");
    17. 		menu->setEnabled(false);
    18. 		connect(this,SIGNAL(FileLoaded(bool)),menu,SLOT(setEnabled(bool)));
    19. 		QAction* action = menu->addAction("&Fault Properties",this,SLOT(FaultPropertiesDlg()),QString("Ctrl+F"));
    20. 			action->setEnabled(false);
    21. 			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
    22. 		action = menu->addAction("&Equalize Fault Segments",this,SLOT(EqualizeDlg()),QString("Ctrl+E"));
    23. 			action->setEnabled(false);
    24. 			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
    25. 		menu->addSeparator();
    26. 		action = menu->addAction("&Define Seafloor",this,SLOT(SeafloorDlg()),QString("Ctrl+D"));
    27. 			action->setEnabled(false);
    28. 			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
    29. 		action = menu->addAction("&New Horizon",this,SLOT(NewHorizonDlg()),QString("Ctrl+N"));
    30. 			action->setEnabled(false);
    31. 			connect(this,SIGNAL(SeaFloorDefined(bool)),action,SLOT(setEnabled(bool)));
    32. 		action = menu->addAction("&Horizon Properties",this,SLOT(HorizonPropertiesDlg()),QString("Ctrl+H"));
    33. 			action->setEnabled(false);
    34. 			connect(this,SIGNAL(SeaFloorDefined(bool)),action,SLOT(setEnabled(bool)));
    35. 	menu = MenuBar.addMenu("View");
    36. 		menu->setEnabled(false);
    37. 		connect(this,SIGNAL(FileLoaded(bool)),menu,SLOT(setEnabled(bool)));
    38. 		action = menu->addAction("&Global View",this,SLOT(ChangeView_Key()),QString("Ctrl+G"));
    39. 			action->setEnabled(false);
    40. 			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
    41. 		action = menu->addAction("&Show Sealevel",this,SLOT(ViewSealevel()));
    42. 			action->setEnabled(false);
    43. 			action->setCheckable(true);
    44. 			action->setChecked(true);
    45. 			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
    46. 			connect(this,SIGNAL(ViewingSealevel(bool)),action,SLOT(setChecked(bool)));
    47. 		action = menu->addAction("Show &Points",this,SLOT(ViewPoints()));
    48. 			action->setEnabled(false);
    49. 			action->setCheckable(true);
    50. 			action->setChecked(true);
    51. 			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
    52. 			connect(this,SIGNAL(ViewingPoints(bool)),action,SLOT(setChecked(bool)));
    53. 	menu = MenuBar.addMenu("Analyze");
    54. 		menu->setEnabled(false);
    55. 		connect(this,SIGNAL(SeaFloorDefined(bool)),menu,SLOT(setEnabled(bool)));
    56. 		action = menu->addAction("Estimate Maximum PPI",this,SLOT(PPIDlg()),QString("Ctrl+A"));
    57. 			action->setEnabled(false);
    58. 			connect(this,SIGNAL(SeaFloorDefined(bool)),action,SLOT(setEnabled(bool)));
    59. 		action = menu->addAction("View Geostatic Ratio",this,SLOT(ViewRatio()),QString("Ctrl+R"));
    60. 			action->setEnabled(false);
    61. 			action->setCheckable(true);
    62. 			connect(this,SIGNAL(RatioCalculated(bool)),action,SLOT(setEnabled(bool)));
    63. 			connect(this,SIGNAL(ViewingRatio(bool)),action,SLOT(setChecked(bool)));
    64. }
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