Parameter "event" is not declared.

qcoderpro

This piece of code is of https://www.qt.io/product/qt6/qml-book/ch04-qmlstart-input#keys-element:

import QtQuick
import QtQuick.Controls

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Rectangle {
        id: square
        width: 100; height: 100
        anchors.centerIn: parent
        color: "green"
        focus: true
        Keys.onLeftPressed: square.x -= 8
        Keys.onRightPressed: square.x += 8
        Keys.onUpPressed: square.y -= 8
        Keys.onDownPressed: square.y += 8

        Keys.onPressed: {
            switch(event.key) {
            case Qt.Key_Plus:
                square.scale += 0.2
                break;
            case Qt.Key_Minus:
                square.scale -= 0.2
                break;
            }
        }
    }

  /*  Dialog {
        id: dialog
        title: "Title"
        standardButtons: Dialog.Ok | Dialog.Cancel
        visible: true
        modal: true
    } */
}

But I get the error: Parameter "event" is not declared.
Why, please?

sierdzio

Looks like a bug in the book, it's using Qt5 syntax. Here is the correct and ugly one for Qt 6:

Keys.onPressed: (event)=> {

qcoderpro

@sierdzio

Thank you for your nice reply. What is that event there? Will you explain it a little?

The code runs but the direction (right-left/up-down) keys don't work!

sierdzio

It's all in the documentation, please look it up. https://doc.qt.io/qt-5/qml-qtquick-keys.html