Add third_party/google-input-tools: Take 2

third_party/google_input_tools/src/chrome/os/inputview/handler/pointerhandler.js

+// Copyright 2014 The ChromeOS IME Authors. All Rights Reserved.
+// limitations under the License.
+// See the License for the specific language governing permissions and
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// Unless required by applicable law or agreed to in writing, software
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// You may obtain a copy of the License at
+// you may not use this file except in compliance with the License.
+// Licensed under the Apache License, Version 2.0 (the "License");
+//
+goog.provide('i18n.input.chrome.inputview.handler.PointerHandler');
+
+goog.require('goog.Timer');
+goog.require('goog.events.EventHandler');
+goog.require('goog.events.EventTarget');
+goog.require('goog.events.EventType');
+goog.require('goog.math.Coordinate');
+goog.require('i18n.input.chrome.inputview.handler.PointerActionBundle');
+
+goog.scope(function() {
+
+
+
+/**
+ * The pointer controller.
+ *
+ * @param {!Element=} opt_target .
+ * @constructor
+ * @extends {goog.events.EventTarget}
+ */
+i18n.input.chrome.inputview.handler.PointerHandler = function(opt_target) {
+  goog.base(this);
+
+  /**
+   * The pointer handlers.
+   *
+   * @type {!Object.<number, !i18n.input.chrome.inputview.handler.PointerActionBundle>}
+   * @private
+   */
+  this.pointerActionBundles_ = {};
+
+  /**
+   * The event handler.
+   *
+   * @type {!goog.events.EventHandler}
+   * @private
+   */
+  this.eventHandler_ = new goog.events.EventHandler(this);
+
+  var target = opt_target || document;
+  this.eventHandler_.
+      listen(target, [goog.events.EventType.MOUSEDOWN,
+        goog.events.EventType.TOUCHSTART], this.onPointerDown_, true).
+      listen(target, [goog.events.EventType.MOUSEUP,
+        goog.events.EventType.TOUCHEND], this.onPointerUp_, true).
+      listen(target, goog.events.EventType.TOUCHMOVE, this.onTouchMove_,
+          true);
+};
+goog.inherits(i18n.input.chrome.inputview.handler.PointerHandler,
+    goog.events.EventTarget);
+var PointerHandler = i18n.input.chrome.inputview.handler.PointerHandler;
+
+
+/**
+ * The canvas class name.
+ * @const {string}
+ * @private
+ */
+PointerHandler.CANVAS_CLASS_NAME_ = 'ita-hwt-canvas';
+
+
+/**
+ * Mouse down tick, which is for delayed pointer up for tap action on touchpad.
+ *
+ * @private {Date}
+ */
+PointerHandler.prototype.mouseDownTick_ = null;
+
+
+/**
+ * Event handler for previous mousedown or touchstart target.
+ *
+ * @private {i18n.input.chrome.inputview.handler.PointerActionBundle}
+ */
+PointerHandler.prototype.previousPointerActionBundle_ = null;
+
+
+/**
+ * Creates a new pointer handler.
+ *
+ * @param {!Node} target .
+ * @return {!i18n.input.chrome.inputview.handler.PointerActionBundle} .
+ * @private
+ */
+PointerHandler.prototype.createPointerActionBundle_ = function(target) {
+  var uid = goog.getUid(target);
+  if (!this.pointerActionBundles_[uid]) {
+    this.pointerActionBundles_[uid] = new i18n.input.chrome.inputview.handler.
+        PointerActionBundle(target, this);
+  }
+  return this.pointerActionBundles_[uid];
+};
+
+
+/**
+ * Callback for mouse/touch down on the target.
+ *
+ * @param {!goog.events.BrowserEvent} e The event.
+ * @private
+ */
+PointerHandler.prototype.onPointerDown_ = function(e) {
+  var pointerActionBundle = this.createPointerActionBundle_(
+      /** @type {!Node} */ (e.target));
+  if (this.previousPointerActionBundle_ &&
+      this.previousPointerActionBundle_ != pointerActionBundle) {
+    this.previousPointerActionBundle_.cancelDoubleClick();
+  }
+  this.previousPointerActionBundle_ = pointerActionBundle;
+  pointerActionBundle.handlePointerDown(e);
+  if (e.type == goog.events.EventType.MOUSEDOWN) {
+    this.mouseDownTick_ = new Date();
+  }
+};
+
+
+/**
+ * Callback for pointer out.
+ *
+ * @param {!goog.events.BrowserEvent} e The event.
+ * @private
+ */
+PointerHandler.prototype.onPointerUp_ = function(e) {
+  if (e.type == goog.events.EventType.MOUSEUP) {
+    // If mouseup happens too fast after mousedown, it may be a tap action on
+    // touchpad, so delay the pointer up action so user can see the visual
+    // flash.
+    if (this.mouseDownTick_ && new Date() - this.mouseDownTick_ < 10) {
+      goog.Timer.callOnce(this.onPointerUp_.bind(this, e), 50);
+      return;
+    }
+  }
+  var uid = goog.getUid(e.target);
+  var pointerActionBundle = this.pointerActionBundles_[uid];
+  if (pointerActionBundle) {
+    pointerActionBundle.handlePointerUp(e);
+  }
+};
+
+
+/**
+ * Callback for touchmove.
+ *
+ * @param {!goog.events.BrowserEvent} e The event.
+ * @private
+ */
+PointerHandler.prototype.onTouchMove_ = function(e) {
+  var touches = e.getBrowserEvent()['touches'];
+  if (!touches || touches.length == 0) {
+    return;
+  }
+  for (var i = 0; i < touches.length; i++) {
+    var uid = goog.getUid(touches[i].target);
+    var pointerActionBundle = this.pointerActionBundles_[uid];
+    if (pointerActionBundle) {
+      pointerActionBundle.handleTouchMove(touches[i]);
+    }
+  }
+};
+
+
+/** @override */
+PointerHandler.prototype.disposeInternal = function() {
+  for (var bundle in this.pointerActionBundles_) {
+    goog.dispose(bundle);
+  }
+  goog.dispose(this.eventHandler_);
+
+  goog.base(this, 'disposeInternal');
+};
+
+});  // goog.scope