How to use key sequences in qml ?

small_bird

Hello, everyone! Now, I'd like to use Ctrl+Z to do the undo practice. However, how to do it in qml ? Does anyone know the answer ? Thanks in advance.

sierdzio

There is Qt::Key_Undo available in KeyEvent.

Some more example uses are listed in Keys component docs - link.

small_bird

@sierdzio Thanks a lot! However, I have not found Qt.Undo or something else. How could I use it in qml ?

sierdzio

Rectangle { // or anything else
  Keys.onPressed: {
    if (event.key == Qt.Key_Undo) {
      // do your undo handling here
      event.accepted = true;
   }
  }
}

If you ask about undo/redo handling in text edit fields - it is handled automatically. If you need some more advanced functionality, use the C++ part for that: QUndoCOmmand and friends. http://doc.qt.io/qt-5/qundo.html

small_bird

@sierdzio There is not a Qt.Key_Undo value. How could you get that?

sierdzio

As said on chat, if Key_Undo is not exported, you can either handle it in c++ or react to Key_Z and check if modifier is ctrl.

jpnurmi

For a focused item, you can use KeyEvent::matches():

Item {
    focus: true
    Keys.onPressed: {
        if (event.matches(StandardKey.Undo))
            myModel.undo()
    }
}

If you want to handle it as a shortcut, regardless of which item has focus, use QML Shortcut:

Shortcut {
    sequence: StandardKey.Undo
    onActivated: myModel.undo()
}

small_bird

@sierdzio Thanks a lot, it works.

sierdzio

@jpnurmi said in How to use key sequences in qml ?:

For a focused item, you can use KeyEvent::matches()
[...]
If you want to handle it as a shortcut, regardless of which item has focus, use QML Shortcut [...]

This is pure gold! Thanks!