set cursor shape from c++ backend

rghvdberg

I've managed to position the mouse pointer from the c++ backend (see "Position mouse cursor" ).
I've tried simply adding this piece of code to the BackEnd class, but it has no effect when I call that function.

void BackEnd::setCursorShape(Qt::CursorShape cursorShape)
{
    cursor.setShape(cursorShape);
    qDebug()<< cursorShape;
}

note: I see Qt::CursorShape(ArrowCursor) and Qt::CursorShape(BlankCursor) in the debug output

Any tips on how to hide/show the cursor from the c++ backend ?

SGaist

Hi,

You are likely looking for QGuiApplication::setOverrideCursor.

Hope it helps

rghvdberg

It works !
code:

//backend.h
#ifndef BACKEND_H
#define BACKEND_H


#include <QObject>
#include <QCursor>
#include <QGuiApplication>

class BackEnd : public QObject
{
    Q_OBJECT

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

signals:

public slots:
    void moveCursor(QPointF p);
    void setCursorShape(Qt::CursorShape shape);
private:
    QCursor cursor;
};

// backend.cpp
#include "backend.h"
#include <QDebug>

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

}

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

void BackEnd::setCursorShape(Qt::CursorShape shape)
{
    switch(shape)
    {
    case Qt::CursorShape::BlankCursor:
    {
        QGuiApplication::setOverrideCursor(QCursor(shape));
        break;
    }

    case Qt::CursorShape::ArrowCursor:
        {
            QGuiApplication::restoreOverrideCursor();
            break;
        }
    default: QGuiApplication::restoreOverrideCursor();
    }
}

// Slider.qml

/*
slider implentation 
Rectangles , etc etc etc
*/ 

// important bit
 MouseArea {
        id: mouse_area
        anchors.fill: root
        onPressedChanged:
        {
           if (pressed)  {
               backend.setCursorShape(Qt.BlankCursor)
           }
        }
        onReleased:
        {
            move_Cursor()
            backend.setCursorShape(Qt.ArrowCursor)
        }
        onMouseYChanged: {
            var pos = maximumValue - mouse.y / root.height * (maximumValue - minimumValue) + minimumValue
            root.value = Math.max(minimumValue, Math.min(pos, maximumValue))

        }

rghvdberg

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