CODEWITHSUNDEEP
c++qt
Sumeet
Sumeet

Reputation: 8292

How to add clear option t qplaintextedit?

I have a qplaintextedit that is loaded dynamically with text contents, with QString.

I want to add an option to the menu that appears when we right click on the qplaintextedit. How can I do it programmatically so that I am able to add my own menu item to the default menu item? Any ideas would be appreciated.

Upvotes: 0

Views: 1789

Answers (3)

Mike Finch
Mike Finch

Reputation: 877

It is not necessary to subclass QPlainTextEdit, nor to use an event filter. You can do it all in the main widget of your application. The following worked for me using Qt versions 4.7.4 and 4.8.5.

In the Designer:

You add a QPlainTextEdit widget whose name is "textbox".

In MainWindow.h:

// Auto generated from MainWindow.ui
#include "ui_MainWindow.h"

class MainWindow : public QMainWindow
{
  Q_OBJECT

private:
  /// The auto generated user interface.
  Ui::MainWindowClass ui;
  ...
}

In MainWindow.cpp:

MainWindow::MainWindow( QWidget * pParent, Qt::WFlags flags )
  : QMainWindow( pParent, flags )
  , ui( )
{
    ui.textbox->setContextMenuPolicy( Qt::CustomContextMenu );
    connect( ui.textbox, SIGNAL( customContextMenuRequested( QPoint ) ),
      this, SLOT( onTextboxCustomContextMenuRequested( QPoint ) ) );
}

void MainWindow::onTextboxCustomContextMenuRequested( QPoint p )
{
  // Start with the standard menu.
  QMenu * pMenu = ui.textbox->createStandardContextMenu();
  QAction * pAction;

  // Clear.
  // Because QPlainTextEdit::clear() is a slot method, I can connect directly to it.
  pAction = new QAction( "Clear", this );
  connect( pAction, SIGNAL( triggered() ), ui.textbox, SLOT( clear() ) );
  pMenu->addAction( pAction );

  // Show the menu.
  QPoint q = ui.textbox->mapToGlobal( p );
  pMenu->exec( q );

  // The menu's ownership is transferred to me, so I must destroy it.
  delete pMenu;
}

Upvotes: 0

Fabio
Fabio

Reputation: 2602

You can sublcass QPlainTextEdit and reimplement the method contextMenuEvent(QContextMenuEvent *event). Alternatively you can add an event filter to a QPlainTextEdit and catch the QContextMenuEvent.

In your implementation, you can call QMenu *QPlainTextEdit::createStandardContextMenu(const QPoint &position) to create the default menu of the text edit and than add your custom items to it.

Example (subclass):

void MyTextEdit::contextMenuEvent(QContextMenuEvent *event)
{
    QMenu* menu = createStandardContextMenu(event->pos());
    QAction* clearAction = menu->addAction("Clear");
    QAction* choosedAction = menu->exec(event->globalPos());
    //...
    delete menu;  
}

See:

Upvotes: 1

Dinendal
Dinendal

Reputation: 279

You have to reimplement the function : void QPlainTextEdit::contextMenuEvent(QContextMenuEvent *event)

More details in the doc here : http://doc.qt.io/qt-5/qplaintextedit.html#contextMenuEvent

Upvotes: 0

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