QTextEdit (clear on right mouse button)

Qt Enthusiast

I have two question . why there is need to call delete menu , since there is no memory created
do we have to call QTextEdit::contextMenuEvent(QContextMenuEvent *event) at the end of the method

void myTextEdit:contextMenuEvent(QContextMenuEvent *event) {

QMenu * menu = createStandardContextMenu();
QAction* clearAction = new IN_CURRENT_POOL QAction("Clear",this);
connect(clearAction,SIGNAL(triggered()),this ,SLOT(clearView()));
menu->addAction(clearAction);
menu->exec(event->globalPos());
if ( menu ) {
delete menu;
}
QTextEdit::contextMenuEvent(QContextMenuEvent* event)

}

void myTextEdit::clearView() {
this->clear();
}

mrjj

@Qt-Enthusiast said:

createStandardContextMenu

Creates a new Menu
doc says
http://doc.qt.io/qt-5/qtextedit.html#createStandardContextMenu
" popup menu's ownership is transferred to the caller."
So you must clean up.
using delete.

SGaist

if (menu) is useless, if you didn't had a menu before your application would already have crashed.
createStandardContextMenu like the name suggests allocates a new QMenu object, hence you have to delete it otherwise you have a memory leak.

Since you only clear in clearView, why not connect clear directly ?

Qt Enthusiast

So the final code as per feedback is

void myTextEdit:contextMenuEvent(QContextMenuEvent event) {
QMenu * menu = createStandardContextMenu();
QAction clearAction = new IN_CURRENT_POOL QAction("Clear",this);
connect(clearAction,SIGNAL(triggered()),this ,SLOT(this-clear());
menu->addAction(clearAction);
menu->exec(event->globalPos());
delete menu;
/// please tell me do we need the line at below
QTextEdit::contextMenuEvent(QContextMenuEvent* event)
}

SGaist

SLOT(this->clear()) is wrong please take the time to look at the signals and slots.

Qt Enthusiast

I will look at signal and slot thanks and we conclude that we do not need

QTextEdit::contextMenuEvent( event) at the end of the method

. Since we are using createStandardContextMenu , QMenu * menu = createStandardContextMenu(); and we are not breaking any base class functionality

Qt Enthusiast

If I see In QTextEdit the default pop menu on Right Mouse Button click is

Copy Ctrl+C

SelectAll Ctrl+A

I am adding clear to this default pop menu by using following code

class myTextEdit:: public QTextEdit {
}

void myTextEdit:contextMenuEvent(QContextMenuEvent event) {
QMenu * menu = createStandardContextMenu();
QAction clearAction = new IN_CURRENT_POOL QAction("Clear",this);
connect(clearAction,SIGNAL(triggered()),this,SLOT(clear()));
menu->addSeparator();
menu->addAction(clearAction);
menu->exec(event->globalPos());
delete menu;
}

I am now getting following pop menu

Copy Ctrl+C

SelectAll Ctrl+A

Clear

I do not get any Key binding for Clear action . What should be appropriate Key binding for Clear and how to add the same

Qt Enthusiast

SelectAll Ctrl+A

I am adding clear to this default pop menu by using following code

class myTextEdit: public QTextEdit {
}

void myTextEdit:contextMenuEvent(QContextMenuEvent event) {
QMenu * menu = createStandardContextMenu();
QAction clearAction = new IN_CURRENT_POOL QAction("Clear",this);
connect(clearAction,SIGNAL(triggered()),this,SLOT(clear()));
menu->addSeparator();
menu->addAction(clearAction);
menu->exec(event->globalPos());
delete menu;
}

I am now getting following pop menu

Copy Ctrl+C
SelectAll Ctrl+A
Clear

I do not get any Key binding for Clear action . What should be appropriate Key binding for Clear and how to add the same

mrjj

@Qt-Enthusiast said:

What should be appropriate Key binding for Clear and how to add the same

Hi
You add it to your action
clearAction ->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_R));

I dont know what appropriate key would be. One that is not used. :)

Qt Enthusiast

This post is deleted!

Qt Enthusiast

I am using following code and clear() slot is not getting triggered when the user press Ctrl+R key . Basically nothing happens when I press Ctrl+R Let me know what I am missing in following code

void myTextEdit:contextMenuEvent(QContextMenuEvent event) {
QMenu * menu = createStandardContextMenu();
QAction clearAction = new IN_CURRENT_POOL QAction("Clear",this);
clearAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_R));
connect(clearAction,SIGNAL(triggered()),this,SLOT(clear()));
menu->addSeparator();
menu->addAction(clearAction);
menu->exec(event->globalPos());
delete menu;
}

Qt Enthusiast

One more question

DO we need to call delete clearAction in the following code or delete menu will take care of all the memory leaks

void myTextEdit:contextMenuEvent(QContextMenuEvent event) {
QMenu * menu = createStandardContextMenu();
QAction clearAction = new IN_CURRENT_POOL QAction("Clear",this);
clearAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_R));
connect(clearAction,SIGNAL(triggered()),this,SLOT(clear()));
menu->addSeparator();
menu->addAction(clearAction);
menu->exec(event->globalPos());
if (clearAction)
delete clearAction;

delete menu;
}

mrjj

Hi
clearAction is inserted into menu so menu should delete it when
you delete menu,