Q3PopupMenu

Hello everybody,

QT:4.1.1

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

Code:

---

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( "&einfügen",  this, SLOT(selectTable()) );
    contextMenu->exec( QCursor::pos() );
    delete contextMenu;
}

---

Code:

---

private:
        void contextMenuEvent ( QContextMenuEvent * );

---

ERROR:

Code:

---

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

---

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 :p

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.

have you this line in your *.cpp ?

Code:

---

#include <Q3PopupMenu>

---

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

Hi everybody! :D

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 :p

Code:

---

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

---

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

try reinplement in QTableWidget contextMenuEvent

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

Quote:

---

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).

Quote:

---

Originally Posted by raphaelf

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

---

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

Hi!
eventfilter looks to be easier like subclass it :o

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

test.h:

Code:

---

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

---

test.cpp:

Code:

---

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();
 
    }

---

Code:

---

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

---

Code:

---

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

---

What is missing. Or what is false?:cool:

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

Code:

---

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());
}

---

Hi! :D
It works!

Code:

---

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 einfügen",  this, SLOT(insertNewRow()) );
    	 contextMenu->addAction( "&datensatz löschen",  this, SLOT(deleteRow()) );
         contextMenu->exec(menuevent->globalPos());
         delete contextMenu;
     }
 
}

---

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

Hi :(
I found a bug!!!

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

If i comment this line, it works :confused:

Code:

---

ui.tableView->installEventFilter(this);

---

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

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

From docs:

Quote:

---

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

in other words

Code:

---

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

---

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

Hi Guys!
ufff :p

Thanks it looks to work perfect now :D

zlatko: yes there was a warning