Q3PopupMenu

**raphaelf** · 6th March 2006, 12:05

Hello everybody,

QT:4.1.1

I am trying to popup a menu inside my QTableView. I get a error on compiling this code:

Qt Code:

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void MainWindow::contextMenuEvent( QContextMenuEvent * )
{
    Q3PopupMenu* contextMenu = new Q3PopupMenu( this );
    Q_CHECK_PTR( contextMenu );
    QLabel *caption = new QLabel( "<font color=darkblue><u><b>"
        "ListView options</b></u></font>", this );
    caption->setAlignment( Qt::AlignCenter );
    contextMenu->insertItem( caption );
    contextMenu->insertItem( "&einfÃ¼gen",  this, SLOT(selectTable()) );
    contextMenu->exec( QCursor::pos() );
    delete contextMenu;
}

void MainWindow::contextMenuEvent( QContextMenuEvent * )
{
    Q3PopupMenu* contextMenu = new Q3PopupMenu( this );
    Q_CHECK_PTR( contextMenu );
    QLabel *caption = new QLabel( "<font color=darkblue><u><b>"
        "ListView options</b></u></font>", this );
    caption->setAlignment( Qt::AlignCenter );
    contextMenu->insertItem( caption );
    contextMenu->insertItem( "&einfÃ¼gen",  this, SLOT(selectTable()) );
    contextMenu->exec( QCursor::pos() );
    delete contextMenu;
}

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Qt Code:

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private:
        void contextMenuEvent ( QContextMenuEvent * );

private:
        void contextMenuEvent ( QContextMenuEvent * );

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ERROR:

Qt Code:

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test.cpp:21:23: Q3PopupMenu: No such file or directory
test.cpp: In member function `virtual void MainWindow::contextMenuEvent(QContext
MenuEvent*)':
test.cpp:217: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:222: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:223: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:224: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:225: warning: possible problem detected in invocation of delete operato
r:
test.cpp:217: warning: `contextMenu' has incomplete type
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: warning: forwa
rd declaration of `struct Q3PopupMenu'
test.cpp:225: note: neither the destructor nor the class-specific operator delet
e will be called, even if they are declared when the class is defined.
mingw32-make[1]: *** [release\test.o] Error 1
mingw32-make[1]: Leaving directory `D:/rapha/qtprojekte/qt4/mainwindowTableModel
/ver3'
mingw32-make: *** [release] Error 2

test.cpp:21:23: Q3PopupMenu: No such file or directory
test.cpp: In member function `virtual void MainWindow::contextMenuEvent(QContext
MenuEvent*)':
test.cpp:217: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:222: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:223: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:224: error: invalid use of undefined type `struct Q3PopupMenu'
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: error: forward
 declaration of `struct Q3PopupMenu'
test.cpp:225: warning: possible problem detected in invocation of delete operato
r:
test.cpp:217: warning: `contextMenu' has incomplete type
D:/apps/Qt/4.1.1/include/QtGui/../../src/gui/widgets/qmenu.h:359: warning: forwa
rd declaration of `struct Q3PopupMenu'
test.cpp:225: note: neither the destructor nor the class-specific operator delet
e will be called, even if they are declared when the class is defined.
mingw32-make[1]: *** [release\test.o] Error 1
mingw32-make[1]: Leaving directory `D:/rapha/qtprojekte/qt4/mainwindowTableModel
/ver3'
mingw32-make: *** [release] Error 2

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I used this code on QT3 in my app. I have not found a example for QT4. Could be that in QT4 is easier, but i found nothing.
If somebody have a example for QT4, why not

**Sarma** · 6th March 2006, 12:16

hi,
Instead of writing Q3PopupMenu, just write QPopupMenu and try the code. That will work and also don't forget to write :
#include <qpopupmenu.h>

As far asthe examples in QT3 are concerned, no where it is mentioned as Q3PopupMenu. You can find the example in the following file:
<qt-directory>/examples/menu/menu.cpp

Please let me know the result.

**zlatko** · 6th March 2006, 12:18

have you this line in your *.cpp ?

Qt Code:

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#include <Q3PopupMenu>

#include <Q3PopupMenu>

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**Sarma** · 6th March 2006, 12:24

No. It is mentioned as :
#include <qpopupmenu.h>

**raphaelf** · 6th March 2006, 12:27

Hi everybody!

zlatko: yes i have

both: i read that: For most purposes, QPopupMenu has been replaced by QMenu in Qt 4.
I tyied now and it works

Qt Code:

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QMenu* contextMenu = new QMenu( this );
    Q_CHECK_PTR( contextMenu );
    contextMenu->addAction( "&einfÃ¼gen",  this, SLOT(selectTable()) );
    contextMenu->exec( QCursor::pos() );
    delete contextMenu;

QMenu* contextMenu = new QMenu( this );
    Q_CHECK_PTR( contextMenu );
    contextMenu->addAction( "&einfÃ¼gen",  this, SLOT(selectTable()) );
    contextMenu->exec( QCursor::pos() );
    delete contextMenu;

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But the menu should just be called inside my QTableView

and i am crashing my mind

Where could i find more informations or examples for that

**zlatko** · 6th March 2006, 12:38

try reinplement in QTableWidget contextMenuEvent

**raphaelf** · 6th March 2006, 12:55

Hi zlatko,
Can you give me more information what you mean?

**jpn** · 6th March 2006, 13:19

Originally Posted by raphaelf

But the menu should just be called inside my QTableView and i am crashing my mind
Where could i find more informations or examples for that

Override table view's contextMenuEvent instead of MainWindow's.. (or use an event filter).

**zlatko** · 6th March 2006, 14:11

Originally Posted by raphaelf

Hi zlatko,
Can you give me more information what you mean?

Create class inherited from QTableView, alike QTableViewMy..and reinplement contextMenuEvent( QContextMenuEvent * )..ant then call menu exec from it.

p.s. also look in jpn post, dont forget that you can use eventFilter instead of sublassing

**raphaelf** · 6th March 2006, 15:12

Hi!
eventfilter looks to be easier like subclass it

I have tried to use it, but i dont have understand 100% how to use it,
please help me to understand

test.h:

Qt Code:

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.
.
protected:        
    bool eventFilter( QObject *o, QEvent *e );

.
.
protected:        
    bool eventFilter( QObject *o, QEvent *e );

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test.cpp:

Qt Code:

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MainWindow::MainWindow()
 
    {
        ui.setupUi(this);
 
        ui.tree->installEventFilter(this);
 
 
      //  connect(ui.tabellen_cb, SIGNAL(currentIndexChanged (int)), this, SLOT(selectTable()));
        connect(ui.actionverbinden, SIGNAL(triggered()), this, SLOT(openLoginDialog()));
        connect(ui.actionNeu, SIGNAL(triggered()), this, SLOT(insertNewRow()));
       	connect(ui.tree, SIGNAL(itemDoubleClicked( QTreeWidgetItem*, int)), this, SLOT(selectTable()));
 
        init();
 
    }

MainWindow::MainWindow()
         
    {
        ui.setupUi(this);
        
        ui.tree->installEventFilter(this);
       

      //  connect(ui.tabellen_cb, SIGNAL(currentIndexChanged (int)), this, SLOT(selectTable()));
        connect(ui.actionverbinden, SIGNAL(triggered()), this, SLOT(openLoginDialog()));
        connect(ui.actionNeu, SIGNAL(triggered()), this, SLOT(insertNewRow()));
       	connect(ui.tree, SIGNAL(itemDoubleClicked( QTreeWidgetItem*, int)), this, SLOT(selectTable()));
      
        init();
       
    }

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Qt Code:

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void MainWindow::contextMenuEvent( QContextMenuEvent * )
{
    QMenu* contextMenu = new QMenu( this );
    Q_CHECK_PTR( contextMenu );
    contextMenu->addAction( "&datensatz einfÃ¼gen",  this, SLOT(insertNewRow()) );
    contextMenu->addAction( "&datensatz lÃ¶schen",  this, SLOT(deleteRow()) );
    contextMenu->exec( QCursor::pos() );
    delete contextMenu;
}

void MainWindow::contextMenuEvent( QContextMenuEvent * )
{
    QMenu* contextMenu = new QMenu( this );
    Q_CHECK_PTR( contextMenu );
    contextMenu->addAction( "&datensatz einfÃ¼gen",  this, SLOT(insertNewRow()) );
    contextMenu->addAction( "&datensatz lÃ¶schen",  this, SLOT(deleteRow()) );
    contextMenu->exec( QCursor::pos() );
    delete contextMenu;
}

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Qt Code:

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bool MainWindow::eventFilter( QObject *o, QEvent *e )
{
 
    if (event->type() == QEvent::ContextMenu) 
    {
 
        return true;
 
    } 
    else 
    {
 
        return false;
    }
 
}

bool MainWindow::eventFilter( QObject *o, QEvent *e )
{
	
    if (event->type() == QEvent::ContextMenu) 
    {
        
        return true;
     
    } 
    else 
    {
    
        return false;
    }
        
}

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What is missing. Or what is false?

**jpn** · 6th March 2006, 15:25

You can use the same way for showing a context menu, as you used in MainWindow::contextMenuEvent

Qt Code:

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if (event->type() == QEvent::ContextMenu)
{
    // you may cast the event to appropriate type:
    QContextMenuEvent* menuevent = static_cast<QContextMenuEvent*>(event);
 
    // (construct and) show your context menu here:
    contextMenu->exec(menuevent->globalPos());
}

if (event->type() == QEvent::ContextMenu)
{
    // you may cast the event to appropriate type:
    QContextMenuEvent* menuevent = static_cast<QContextMenuEvent*>(event);

    // (construct and) show your context menu here:
    contextMenu->exec(menuevent->globalPos());
}

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**raphaelf** · 6th March 2006, 15:48

Hi!

It works!

Qt Code:

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bool MainWindow::eventFilter( QObject *o, QEvent *event )
{
 
    if (event->type() == QEvent::ContextMenu) 
    {
 
         QContextMenuEvent* menuevent = static_cast<QContextMenuEvent*>(event);
 
         QMenu* contextMenu = new QMenu( this );
    	 Q_CHECK_PTR( contextMenu );
    	 contextMenu->addAction( "&datensatz einfÃ¼gen",  this, SLOT(insertNewRow()) );
    	 contextMenu->addAction( "&datensatz lÃ¶schen",  this, SLOT(deleteRow()) );
         contextMenu->exec(menuevent->globalPos());
         delete contextMenu;
     }
 
}

bool MainWindow::eventFilter( QObject *o, QEvent *event )
{
	
    if (event->type() == QEvent::ContextMenu) 
    {
        
         QContextMenuEvent* menuevent = static_cast<QContextMenuEvent*>(event);
         
         QMenu* contextMenu = new QMenu( this );
    	 Q_CHECK_PTR( contextMenu );
    	 contextMenu->addAction( "&datensatz einfÃ¼gen",  this, SLOT(insertNewRow()) );
    	 contextMenu->addAction( "&datensatz lÃ¶schen",  this, SLOT(deleteRow()) );
         contextMenu->exec(menuevent->globalPos());
         delete contextMenu;
     }
        
}

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If i have understand with "xxx->installEventFilter(this);" i enable a event for Object xxx

**raphaelf** · 6th March 2006, 16:37

Hi

I found a bug!!!

If i change my column width the values stay (see picutre).

If i comment this line, it works

Qt Code:

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ui.tableView->installEventFilter(this);

ui.tableView->installEventFilter(this);

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Oh, sheet, what should i do now?I dont think thats a qt bug

**jpn** · 6th March 2006, 16:50

The event filter function should return a value:
bool MainWindow::eventFilter( QObject *o, QEvent *event )

From docs:

In your reimplementation of this function, if you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.

..so make it return false

**zlatko** · 6th March 2006, 17:07

in other words

Qt Code:

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if (event->type() == QEvent::ContextMenu)
    {
         QContextMenuEvent* menuevent = static_cast<QContextMenuEvent*>(event);
 
         QMenu* contextMenu = new QMenu( this );
         Q_CHECK_PTR( contextMenu );
         contextMenu->addAction( "&datensatz einfÃ¼gen",  this, SLOT(insertNewRow()) );
         contextMenu->addAction( "&datensatz lÃ¶schen",  this, SLOT(deleteRow()) );
         contextMenu->exec(menuevent->globalPos());
         delete contextMenu;
         return true;
     }
else
 return false;

if (event->type() == QEvent::ContextMenu)
    {
         QContextMenuEvent* menuevent = static_cast<QContextMenuEvent*>(event);

         QMenu* contextMenu = new QMenu( this );
         Q_CHECK_PTR( contextMenu );
         contextMenu->addAction( "&datensatz einfÃ¼gen",  this, SLOT(insertNewRow()) );
         contextMenu->addAction( "&datensatz lÃ¶schen",  this, SLOT(deleteRow()) );
         contextMenu->exec(menuevent->globalPos());
         delete contextMenu;
         return true;
     }
else
 return false;

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I think your compilator give you something alike that warning : not of all control block retun value

**raphaelf** · 6th March 2006, 18:57

Hi Guys!
ufff

Thanks it looks to work perfect now

zlatko: yes there was a warning

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