Custom QTreeWidgetItem context menu?

[AaronMK]

I am trying to create QTreeWidgetItems with custom context menus. I would like to have QTreeWidget and QTreeWidgetItem derived classes like the following example:

class  QCustomTreeWidget;
 
class QCustomTreeItem : public QTreeWidgetItem
{
public:
     QCustomTreeItem(QCustomTreeWidget *view);
     QCustomTreeItem(QCustomTreeItem *parent);
     virtual ~QCustomTreeItem();
 
     virtual void onContextMenu(QContextMenuEvent *event) = 0;
};
 
class QMyPluginItem : public QCustomTreeItem
{
public:
     QMyPluginItem(QCustomTreeWidget *view);
     QMyPluginItem(QCustomTreeItem *parent);
     virtual ~QMyPluginItem();
 
     virtual void onContextMenu(QContextMenuEvent *event)
     {
          // create the context menu
          QMenu* ContextMenu = new QMenu();
 
          QAction *actCustom = new QAction("Custom Action", ContextMenu);
          ContextMenu->addAction(actCustom);
          connect(actCustom, SIGNAL(triggered(void)), this, SLOT(onCustomAction(void)));
 
          ContextMenu->exec( event->globalPos() );
 
          delete ContextMenu;
     }
 
private slots:
     void onCustomAction();
};
 
 
class QCustomTreeWidget : public QTreeWidget
{
     Q_OBJECT
public:
     QCustomTreeWidget(QWidget *parent = 0);
     virtual ~QCustomTreeWidget();
 
protected:
     virtual void contextMenuEvent(QContextMenuEvent *event)
     {
          QCustomTreeItem* selected =
               reinterpret_cast<QCustomTreeItem*>(currentItem());
 
          if ( 0 != selected )
               selected->onContextMenu(event);
     };
};

class  QCustomTreeWidget;

class QCustomTreeItem : public QTreeWidgetItem
{
public:
     QCustomTreeItem(QCustomTreeWidget *view);
     QCustomTreeItem(QCustomTreeItem *parent);
     virtual ~QCustomTreeItem();

     virtual void onContextMenu(QContextMenuEvent *event) = 0;
};

class QMyPluginItem : public QCustomTreeItem
{
public:
     QMyPluginItem(QCustomTreeWidget *view);
     QMyPluginItem(QCustomTreeItem *parent);
     virtual ~QMyPluginItem();

     virtual void onContextMenu(QContextMenuEvent *event)
     {
          // create the context menu
          QMenu* ContextMenu = new QMenu();
	
          QAction *actCustom = new QAction("Custom Action", ContextMenu);
          ContextMenu->addAction(actCustom);
          connect(actCustom, SIGNAL(triggered(void)), this, SLOT(onCustomAction(void)));

          ContextMenu->exec( event->globalPos() );

          delete ContextMenu;
     }

private slots:
     void onCustomAction();
};


class QCustomTreeWidget : public QTreeWidget
{
     Q_OBJECT
public:
     QCustomTreeWidget(QWidget *parent = 0);
     virtual ~QCustomTreeWidget();

protected:
     virtual void contextMenuEvent(QContextMenuEvent *event)
     {
          QCustomTreeItem* selected =
               reinterpret_cast<QCustomTreeItem*>(currentItem());

          if ( 0 != selected )
               selected->onContextMenu(event);
     };
};

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I know that Singals and Slots can only work on QObjects. Looking at the documentation and the Qt source, QTreeWidgetItem is not a subclass of QObject (or anything). I dislike multiple inheritance very much, but tried deriving QCustomTreeItem from both QTreeWidgetItem and QObject to add Signal and Slot functionality. I got the following warning:

Warning: Class QCustomTreeItem inherits from two QObject subclasses QTreeWidgetItem and QObject. This is not supported!

If these did not have to be customizable plugin objects, I might just bite the bullet and put a big switch block in QCustomTreeWidget::contextMenuEvent().

Is there a way make the above model work?

Thanks!

[mchara]

This error means, that QTreeQWidgetItem is QObject internally...

anyhow, i think using contextMenu events is bad idea in this case(because it's not enougth elastic mechanism). I would create MyTreeWidgetItem with setMenu(QMenu*) / getMenu methods, and override mouseClick method(of a tree) to call getMenu()->exec() for clicked item. It's easier way in my opinion.

[AaronMK]

All I really see that doing is moving the execution of the menu into QCustomTreeWidget. I would still need a way to connect the QCustomTreeWidget:nCustomAction(); slot to actCustom::triggered().

I'll probably end up making a QObject derived class that spits out the tree-node when needed. Then I'll have something to signal/slot.

[mkkguru]

Hi,u try this below code

//action method.
void XXXX::XXX()
{


action_New = new QAction("&New", ui->treeWidget);
action_Open = new QAction("&Open", ui->treeWidget);

//add the code at slots
connect(action_New, SIGNAL(triggered()), this, SLOT(on_action_New_triggered()));
connect(action_Open, SIGNAL(triggered()), this, SLOT(on_action_Open_triggered()));

ui->treeWidget->addAction(action_New);
ui->treeWidget->addAction(action_Open);
ui->treeWidget->setContextMenuPolicy(Qt::ActionsContextMenu);

}

[aamer4yu]

I guess one could also useQTreeWidget::itemClicked to provide menus for items.