main.qml Example File

multi-screen/qml/main.qml
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 import QtQml 2.2
 import QtQuick 2.0
 import QtQuick.Window 2.3 as Window
 import QtWayland.Compositor 1.3
 import QtQml.Models 2.1

 WaylandCompositor {
     id: comp

     ListModel {
         id: emulatedScreens
         ListElement { name: "left";   virtualX: 0;    virtualY: 0; width: 800; height: 600 }
         ListElement { name: "middle"; virtualX: 800;  virtualY: 0; width: 800; height: 600 }
         ListElement { name: "right";  virtualX: 1600; virtualY: 0; width: 800; height: 600 }
     }

     property bool emulated: Qt.application.screens.length < 2

     Instantiator {
         id: screens
         model: emulated ? emulatedScreens : Qt.application.screens

         delegate: Screen {
             surfaceArea.color: "lightsteelblue"
             text: name
             compositor: comp
             screen: modelData
             Component.onCompleted: if (!comp.defaultOutput) comp.defaultOutput = this
             position: Qt.point(virtualX, virtualY)
             windowed: emulated
         }
     }

     Component {
         id: chromeComponent
         Chrome {}
     }

     Component {
         id: moveItemComponent
         Item {}
     }

     Item {
         id: rootItem
     }

     WlShell {
         onWlShellSurfaceCreated: handleShellSurfaceCreated(shellSurface)
     }

     XdgShellV6 {
         onToplevelCreated: handleShellSurfaceCreated(xdgSurface)
     }

     XdgShell {
         onToplevelCreated: handleShellSurfaceCreated(xdgSurface)
     }

     function createShellSurfaceItem(shellSurface, moveItem, output) {
         var parentSurfaceItem = output.viewsBySurface[shellSurface.parentSurface];
         var parent = parentSurfaceItem || output.surfaceArea;
         var item = chromeComponent.createObject(parent, {
             "shellSurface": shellSurface,
             "moveItem": moveItem,
             "output": output
         });
         if (parentSurfaceItem) {
             item.x += output.position.x;
             item.y += output.position.y;
         }
         output.viewsBySurface[shellSurface.surface] = item;
     }

     function handleShellSurfaceCreated(shellSurface) {
         var moveItem = moveItemComponent.createObject(rootItem, {
             "x": screens.objectAt(0).position.x,
             "y": screens.objectAt(0).position.y,
             "width": Qt.binding(function() { return shellSurface.surface.width; }),
             "height": Qt.binding(function() { return shellSurface.surface.height; })
         });
         for (var i = 0; i < screens.count; ++i)
             createShellSurfaceItem(shellSurface, moveItem, screens.objectAt(i));
     }
 }