constructor Stage

Source

Stage(CanvasElement canvas, {int width, int height, StageOptions options}) {

  if (canvas is! CanvasElement) throw new ArgumentError("canvas");
  if (canvas.tabIndex <= 0) canvas.tabIndex = 1;
  if (canvas.style.outline == "") canvas.style.outline = "none";
  if (options == null) options = Stage.defaultOptions;
  if (width == null) width = canvas.width;
  if (height == null) height = canvas.height;

  backgroundColor = options.backgroundColor;
  preventDefaultOnTouch = options.preventDefaultOnTouch;
  preventDefaultOnMouse = options.preventDefaultOnMouse;
  preventDefaultOnWheel = options.preventDefaultOnWheel;
  preventDefaultOnKeyboard = options.preventDefaultOnKeyboard;

  _canvas = canvas;
  _stageAlign = options.stageAlign;
  _stageScaleMode = options.stageScaleMode;
  _stageRenderMode = options.stageRenderMode;
  _inputEventMode = options.inputEventMode;

  _sourceWidth = ensureInt(width);
  _sourceHeight = ensureInt(height);
  _pixelRatio = minNum(options.maxPixelRatio, env.devicePixelRatio);
  _renderContext = _createRenderContext(canvas, options);
  _renderState = new RenderState(_renderContext);

  print("StageXL render engine : ${_renderContext.renderEngine}");

  canvas.onKeyDown.listen(_onKeyEvent);
  canvas.onKeyUp.listen(_onKeyEvent);
  canvas.onKeyPress.listen(_onKeyEvent);

  var listenToMouseEvents =
      _inputEventMode == InputEventMode.MouseOnly ||
      _inputEventMode == InputEventMode.MouseAndTouch;

  if (listenToMouseEvents) {
    canvas.onMouseDown.listen(_onMouseEvent);
    canvas.onMouseUp.listen(_onMouseEvent);
    canvas.onMouseMove.listen(_onMouseEvent);
    canvas.onMouseOut.listen(_onMouseEvent);
    canvas.onContextMenu.listen(_onMouseEvent);
    canvas.onMouseWheel.listen(_onMouseWheelEvent);
  }

  var listenToTouchEvents =
      _inputEventMode == InputEventMode.TouchOnly ||
      _inputEventMode == InputEventMode.MouseAndTouch;

  if (listenToTouchEvents && env.isTouchEventSupported) {
    canvas.onTouchStart.listen(_onTouchEvent);
    canvas.onTouchEnd.listen(_onTouchEvent);
    canvas.onTouchMove.listen(_onTouchEvent);
    canvas.onTouchEnter.listen(_onTouchEvent);
    canvas.onTouchLeave.listen(_onTouchEvent);
    canvas.onTouchCancel.listen(_onTouchEvent);
  }

  Mouse.onCursorChanged.listen((cursorName) => _updateMouseCursor());

  _updateMouseCursor();
  _updateCanvasSize();
  _renderContext.clear(backgroundColor);
}