CODEWITHSUNDEEP
c++openglqt5qtquick2virtual-reality
seryogah
seryogah

Reputation: 81

Sending mouse events to a QtQuick window in a virtual reality OpenGL scene

I am currently working on a virtual reality project that builds on OpenGL. Because I also needed some form of user interface, I thought it would be a good idea to integrate QtQuick windows into the scene. Drawing the window to a texture works without problems (I used this example) but I struggle to send mouse events so that my controllers can interact with it.

Here is a quick example video on YouTube. In this example, the animation of the embedded GIF should stop whenever I hover over it. This works in a normal QML application but not when I manually send a MouseMove event. The mouse position within the window is known (the red line in the video indicates an intersection) and I am currently sending the event through 

QQuickWindow::sendEvent(QQuickItem* item, QEvent*)

where item is the root Rectangle in the qml source:

import QtQuick 2.3
import QtQuick.Controls 2.0

Rectangle {
    color: mouseArea.containsMouse ? "red" : "white"
    width: 600
    height: 400

    MouseArea {
        id: mouseArea
        anchors.fill: parent
        hoverEnabled: true

        AnimatedImage {
            anchors.fill: parent
            paused: mouseArea.containsMouse
            source: "test.gif"
        }
    }
}

The event, which I send every time an intersection between the ray and the window is found, is done with:

QMouseEvent* mouseMoveEvent = new QMouseEvent(
    QEvent::MouseMove, // wrong event?
    cursorPosition, cursorPosition, // Note: cursorPosition := the calculated cursor coordinates within the window
    Qt::MouseButton::NoButton,
    Qt::MouseButtons(), // is this right?
    Qt::KeyboardModifier::NoModifier);
window->sendEvent(rootItem, mouseMoveEvent); // Note: window is my QQuickWindow, rootItem is the root Rectangle

I am not an expert in QML (rarely used it) and would appreciate it if someone has suggestions on how to solve this. My guess is, that I am neither using the right event nor correctly sending them.

Upvotes: 4

Views: 1014

Answers (1)

seryogah
seryogah

Reputation: 81

I found a solution myself. Instead of using QQuickWindow::sendEvent(..) I had to simply use QApplication()::instance()->sendEvent(..).

Upvotes: 4

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