QWaylandCompositor question

[SQEW]

Hi,

I'm trying to convert the Pure QML Wayland compositor example into C++.

main.cpp

#include "compositor.h"
int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts,true);
    QGuiApplication app(argc,argv);
    Compositor *compositor=new Compositor;
    return app.exec();
}

compositor.h

#ifndef COMPOSITOR_H
#define COMPOSITOR_H
#include <QWaylandCompositor>
#include <QWaylandOutput>
#include <QWaylandXdgShell>
#include <QQuickView>
#include "chrome.h"
class Compositor:public QWaylandCompositor
{
    Q_OBJECT

public:
    Compositor();

private:
    QWaylandOutput *m_output=nullptr;
    QWaylandXdgShell *m_xdgShell=nullptr;

private slots:
    void createdChangedSlot();
    void toplevelCreatedSlot(QWaylandXdgToplevel *toplevel,QWaylandXdgSurface *xdgSurface);
};
#endif

compositor.cpp

#include "compositor.h"
Compositor::Compositor()
{    
    setSocketName("testcomp");
    setUseHardwareIntegrationExtension(true);
    connect(this,SIGNAL(createdChanged()),this,SLOT(createdChangedSlot()));
    m_xdgShell=new QWaylandXdgShell(this);
 connect(m_xdgShell,SIGNAL(toplevelCreated(QWaylandXdgToplevel*,QWaylandXdgSurface*)),SLOT(toplevelCreatedSlot(QWaylandXdgToplevel*,QWaylandXdgSurface*)));

    Chrome::rootWindow=new QQuickView(QUrl("qrc:/testcomp/Root.qml"));
    create();
}

void Compositor::createdChangedSlot()
{
    if(isCreated()){
        m_output=new QWaylandOutput(this,Chrome::rootWindow);
        m_output->setSizeFollowsWindow(true);
    }
}

void Compositor::toplevelCreatedSlot(QWaylandXdgToplevel *toplevel,QWaylandXdgSurface *surface)
{
    Chrome::list.append(new Chrome(toplevel,surface));
}

chrome.h

#ifndef CHROME_H
#define CHROME_H

#include <QWaylandQuickShellSurfaceItem>
#include <QWaylandXdgToplevel>

class Chrome:public QWaylandQuickShellSurfaceItem
{
    Q_OBJECT

public:
    explicit Chrome(QWaylandXdgToplevel *toplevel,QWaylandShellSurface *surface);
    ~Chrome();
    static QList<Chrome*> list;
    static QQuickView *rootWindow;

private:
    QWaylandXdgToplevel *m_toplevel;
};
#endif

chrome.cpp

#include "chrome.h"
Chrome::Chrome(QWaylandXdgToplevel *toplevel,QWaylandShellSurface *surface)
{
    m_toplevel=toplevel;
    setParentItem(rootWindow->contentItem());
    setShellSurface(surface);
}
QList<Chrome*> Chrome::list;
QQuickView *Chrome::rootWindow;

Root.qml

import QtQuick
Rectangle{
    anchors.fill:parent
    color:'black'
}

Running this code gets me a semi-working compositor, which allows me to open other Qt-based apps in it (by setting WAYLAND_DISPLAY=testcomp). I can maximize/unmaximize them and close them using the titlebar buttons, but the apps themselves do not respond to any mouse clicks. (Interestingly, right-button clicks appear to work, and popup menus appear). Apps with animated content (like projectM-pulseaudio) show up but do not 'animate', while they work fine in the QML example.

I run the compositor nested in another (for now).

I am guessing I need to do something with the QWaylandXdgTopLevel object, but I don't know what, and I can't figure it out from the QML example either.

I would really appreciate it if somebody could help me out.

[SQEW]

I condensed the QML example down to the following:

import QtQuick
import QtWayland.Compositor
import QtWayland.Compositor.XdgShell
Item{
    WaylandCompositor{
        id:waylandCompositor
        WaylandOutput{
            id:output
            compositor:waylandCompositor
            property ListModel shellSurfaces:ListModel{}
            function handleShellSurface(shellSurface){shellSurfaces.append({shellSurface:shellSurface});}
            sizeFollowsWindow:true
            window:Window{
                width:1024
                height:760
                visible:true
                Repeater{
                    model:output.shellSurfaces
                    ShellSurfaceItem{
                        shellSurface:modelData
                        onSurfaceDestroyed:output.shellSurfaces.remove(index)
                    }
                }
            }
        }
        XdgShell{
            onToplevelCreated:{
                console.log(xdgSurface)

                output.handleShellSurface(xdgSurface)
            }
        }
    }
}

I really wish the Qt devs didn't obscure the inner working of the compositor behind their QML like this. It looks very simple on the surface but the use of the Repeater here does things that I am unable to replicate in C++.

So what is the proper way to display a QWaylandXdgSurface on a QWaylandOutput?

Could somebody please help? I've been stuck on this for days and I am unable to make any meaningful progress. The documentation is hugely confusing as well.

[SQEW]

This post is deleted!

[SGaist]

Hi,

This module is likely part of the set that are less used by people on this forum. You might want to check on the interest mailing list. You'll find there Qt's developers/maintainers.

[SQEW]

@SGaist

Hi,

Thanks, I'll check it out.