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();
          }
      }
  }