Position mouse cursor

rghvdberg

Is it possible to move the mouse position?
Something like setPos(x, y)

SGaist

Hi,

Out of curiosity, what is your purpose for that ?

rghvdberg

The designer of the app wants the mouse pointer hidden when moving a control (knob or slider) and when the mouse is released the cursor should re appear at the stop position of the control. Even if it has been moved outside of the control.

SGaist

You can use the QCursor for that. You can take a look at this stack overflow answer to get a starting point.

rghvdberg

@SGaist thanks, I got it working, kind off
as in the post you linked I need to figure out the x,y coordinates to jump to :-)

rghvdberg

when I have a 'complete' solution I'll post the code here, in the case somebody needs to do the same

rghvdberg

Solved it \o/

Here's a (bit) shortened version of my code.

there's some qml code to hide the cursor when moving the slider, I think I'm gonna move that to c++ too.
according to the docs mapToGlobal(,x,y) returns a qml point a "x,y"
I logged the output of mapToGlobal() and it gave : QPointF(951, 519)
QtCursor::setPos() can't handle the QPointF , only QPoint, so I took the x and y of that point and used QtCursor::setPos(x,y).

Comments welcome :-)

C++ part

///backend.h
#ifndef BACKEND_H
#define BACKEND_H

#include <QObject>
#include <QCursor>

class BackEnd : public QObject
{
    Q_OBJECT

public:
    explicit BackEnd(QObject *parent = nullptr);

signals:

public slots:
    void moveCursor(QPointF p);

private:
    QCursor cursor;
};

#endif // BACKEND_H

// backend.cpp
#include "backend.h"

BackEnd::BackEnd(QObject *parent) :
    QObject(parent)
{
}

void BackEnd::moveCursor(QPointF p)
{
    int x = p.x();
    int y = p.y();
    cursor.setPos(x,y);
}

main.cpp
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "backend.h"

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<BackEnd>("borealis.backend", 1, 0, "BackEnd");

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;
    return app.exec();
}

QML part

// main.qml

import QtQuick 2.2
import QtQuick.Window 2.2
import borealis.backend 1.0
import "components" // Slider.qml is in dir ./components

ApplicationWindow {
    id: borealis
    width: 640
    height: 480
    visible: true
    property alias backend: backend
    title: qsTr("Borealis")
    color: "#3b3b3b"

    BackEnd {
        id: backend // this links to the cpp code
    }
 
  Slider{
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
    }
}

// Slider.qml , custom slider (not using qtquick controls)
Item {
    id: root
    property real value: 0.5
    property int minimumValue: 0
    property int maximumValue: 1
    implicitWidth: 20
    implicitHeight: 100
    property variant mappedcursor

    Rectangle {
        id: back
        height: root.height
        width: root.width
        color: "slate grey"
    }
    Rectangle {
        id: slider
        height: root.height * value
        width: root.width
        anchors.bottom: back.bottom
        color: "dark grey"
        anchors.bottomMargin: 0
    }
    Rectangle {
        id: handle
        height: 2
        anchors.top: slider.top
        anchors.topMargin: 0
        width: root.width
    }

    MouseArea {
        anchors.fill: root
        cursorShape: pressed ? Qt.BlankCursor : Qt.ArrowCursor
        onReleased: move_Cursor()
        onMouseYChanged: {
            var pos = maximumValue - mouse.y / root.height * (maximumValue - minimumValue) + minimumValue
            root.value = Math.max(minimumValue, Math.min(pos, maximumValue))
        }
    }

    function move_Cursor()
    {
        mappedcursor = mapToGlobal(handle.width / 2,handle.y)
        backend.moveCursor(mappedcursor)
    }
}

rghvdberg

turns out I don't need to QCursor object, QCursor::setPos(x,y) works too

erika_rafaesky

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Position mouse cursor