Move client/{base, observable, layout, touch, util, view} to samples/ui_lib .

client/touch/TouchUtil.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/**
- * Wraps a callback with translations of mouse events to touch events. Use
- * this function to invoke your callback that expects touch events after
- * touch events are created from the actual mouse events.
- */
-EventListener mouseToTouchCallback(EventListener callback) {
-  return (MouseEvent e) {
-    var touches = <Touch>[];
-    var targetTouches = <Touch>[];
-    var changedTouches = <Touch>[];
-    final mockTouch = new MockTouch(e);
-    final mockTouchList = <Touch>[mockTouch];
-    if (e.type == 'mouseup') {
-      changedTouches = mockTouchList;
-    } else {
-      touches = mockTouchList;
-      targetTouches = mockTouchList;
-    }
-    callback(new MockTouchEvent(e, touches, targetTouches, changedTouches));
-    // Required to prevent spurious selection changes while tracking touches
-    // on devices that don't support touch events.
-    e.preventDefault();
-  };
-}
-
-/** Helper method to attach event listeners to a [node]. */
-void _addEventListeners(Element node,
-    EventListener onStart, EventListener onMove, EventListener onEnd,
-    EventListener onCancel, [bool capture = false]) {
-
-  Function removeListeners;
-
-  onEndWrapper(e) {
-    removeListeners();
-    return onEnd(e);
-  }
-
-  onLeaveWrapper(e) {
-    removeListeners();
-    return onEnd(e);
-  }
-
-  onCancelWrapper(e) {
-    removeListeners();
-    return onCancel(e);
-  }
-
-  if (Device.supportsTouch) {
-    removeListeners = () {
-      document.on.touchMove.remove(onMove, capture);
-      document.on.touchEnd.remove(onEndWrapper, capture);
-      document.on.touchLeave.remove(onLeaveWrapper, capture);
-      document.on.touchCancel.remove(onCancelWrapper, capture);
-    };
-
-    node.on.touchStart.add((e) {
-      document.on.touchMove.add(onMove, capture);
-      document.on.touchEnd.add(onEndWrapper, capture);
-      document.on.touchLeave.add(onLeaveWrapper, capture);
-      document.on.touchCancel.add(onCancelWrapper, capture);
-      return onStart(e);
-    }, capture);
-  } else {
-    onStart = mouseToTouchCallback(onStart);
-    onMove = mouseToTouchCallback(onMove);
-    onEnd = mouseToTouchCallback(onEnd);
-    // onLeave will never be called if the device does not support touches.
-
-    removeListeners = () {
-      document.on.mouseMove.remove(onMove, capture);
-      document.on.mouseUp.remove(onEndWrapper, capture);
-      document.on.touchCancel.remove(onCancelWrapper, capture);
-    };
-
-    node.on.mouseDown.add((e) {
-      document.on.mouseMove.add(onMove, capture);
-      document.on.mouseUp.add(onEndWrapper, capture);
-      document.on.touchCancel.add(onCancelWrapper, capture);
-      return onStart(e);
-    }, capture);
-  }
-}
-
-/**
- * Gets whether the given touch event targets the node, or one of the node's
- * children.
- */
-bool _touchEventTargetsNode(event, Node node) {
-  Node target = event.changedTouches[0].target;
-
-  // TODO(rnystrom): Move this into Dom.
-  // Walk up the parents looking for the node.
-  while (target != null) {
-    if (target == node) {
-      return true;
-    }
-    target = target.parent;
-  }
-
-  return false;
-}
-
-interface Touchable {
-  /**
-   * Provide the HTML element that should respond to touch events.
-   */
-  Element getElement();
-
-  /**
-   * The object has received a touchend event.
-   */
-  void onTouchEnd();
-
-  /**
-   * The object has received a touchstart event.
-   * Returns return true if you want to allow a drag sequence to begin,
-   *      false you want to disable dragging for the duration of this touch.
-   */
-  bool onTouchStart(TouchEvent e);
-}
-
-interface Draggable extends Touchable {
-  /**
-   * The object's drag sequence is now complete.
-   */
-  void onDragEnd();
-
-  /**
-   * The object has been dragged to a new position.
-   */
-  void onDragMove();
-
-  /**
-   * The object has started dragging.
-   * Returns true to allow a drag sequence to begin (custom behavior),
-   * false to disable dragging for this touch duration (allow native scrolling).
-   */
-  bool onDragStart(TouchEvent e);
-
-  bool get verticalEnabled();
-  bool get horizontalEnabled();
-}
-
-class MockTouch implements Touch {
-  MouseEvent wrapped;
-
-  MockTouch(MouseEvent this.wrapped) {}
-
-  int get clientX() => wrapped.clientX;
-
-  int get clientY() => wrapped.clientY;
-
-  int get identifier() => 0;
-
-  int get pageX() => wrapped.pageX;
-
-  int get pageY() => wrapped.pageY;
-
-  int get screenX() => wrapped.screenX;
-
-  int get screenY() {return wrapped.screenY; }
-
-  EventTarget get target() => wrapped.target;
-
-  num get webkitForce() { throw new NotImplementedException(); }
-  int get webkitRadiusX() { throw new NotImplementedException(); }
-  int get webkitRadiusY() { throw new NotImplementedException(); }
-  num get webkitRotationAngle() { throw new NotImplementedException(); }
-}
-
-class MockTouchEvent implements TouchEvent {
-  MouseEvent wrapped;
-  // TODO(jacobr): these are currently Lists instead of a TouchList.
-  final List<Touch> touches;
-  final List<Touch> targetTouches;
-  final List<Touch> changedTouches;
-  MockTouchEvent(MouseEvent this.wrapped, List<Touch> this.touches,
-      List<Touch> this.targetTouches,
-      List<Touch> this.changedTouches) {}
-
-  bool get bubbles() => wrapped.bubbles;
-
-  bool get cancelBubble() => wrapped.cancelBubble;
-
-  void set cancelBubble(bool value) { wrapped.cancelBubble = value; }
-
-  bool get cancelable() => wrapped.cancelable;
-
-  EventTarget get currentTarget() => wrapped.currentTarget;
-
-  bool get defaultPrevented() => wrapped.defaultPrevented;
-
-  int get eventPhase() => wrapped.eventPhase;
-
-  void set returnValue(bool value) { wrapped.returnValue = value; }
-
-  bool get returnValue() => wrapped.returnValue;
-
-  EventTarget get srcElement() => wrapped.srcElement;
-
-  EventTarget get target() => wrapped.target;
-
-  int get timeStamp() => wrapped.timeStamp;
-
-  String get type() => wrapped.type;
-
-  void preventDefault() { wrapped.preventDefault(); }
-
-  void stopImmediatePropagation() { wrapped.stopImmediatePropagation(); }
-
-  void stopPropagation() { wrapped.stopPropagation(); }
-
-  int get charCode() => wrapped.charCode;
-
-  int get detail() => wrapped.detail;
-
-  int get keyCode() => wrapped.keyCode;
-
-  int get layerX() => wrapped.layerX;
-
-  int get layerY() => wrapped.layerY;
-
-  int get pageX() => wrapped.pageX;
-
-  int get pageY() => wrapped.pageY;
-
-  Window get view() => wrapped.view;
-
-  int get which() => wrapped.which;
-
-  bool get altKey() => wrapped.altKey;
-
-  bool get ctrlKey() => wrapped.ctrlKey;
-
-  bool get metaKey() => wrapped.metaKey;
-
-  bool get shiftKey() => wrapped.shiftKey;
-}