Chrome.qml Example File

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import QtQuick 2.0
import QtWayland.Compositor 1.0
Item {
    id: chrome
    property alias shellSurface: surfaceItem.shellSurface
    property alias surfaceItem: surfaceItem
    property alias moveItem: surfaceItem.moveItem
    x: surfaceItem.moveItem.x - surfaceItem.output.geometry.x
    y: surfaceItem.moveItem.y - surfaceItem.output.geometry.y
    ShellSurfaceItem {
        id: surfaceItem
        onSurfaceDestroyed: chrome.destroy();
    }
    onXChanged: updatePrimary()
    onYChanged: updatePrimary()
    function updatePrimary() {
        var w = surfaceItem.width
        var h = surfaceItem.height
        var area = w * h;
        var screenW = surfaceItem.output.geometry.width;
        var screenH = surfaceItem.output.geometry.height;
        var x1 = Math.max(0, x);
        var y1 = Math.max(0, y);
        var x2 = Math.min(x + w, screenW);
        var y2 = Math.min(y + h, screenH);
        var w1 = Math.max(0, x2 - x1);
        var h1 = Math.max(0, y2 - y1);
        if (w1 * h1 * 2 > area) {
            surfaceItem.setPrimary();
        }
    }
}