1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 * Provide an alternative location for the application's context menu items
8 * on platforms that don't provide it.
10 * To mimic the behaviour of an OS-provided context menu, the menu is dismissed
11 * in three situations:
13 * 1. When the window loses focus (i.e, the user has clicked on another window
15 * 2. When the user selects an option from the menu.
16 * 3. When the user clicks on another part of the same window; this is achieved
17 * using an invisible screen element behind the menu, but in front of all
20 * TODO(jamiewalch): Fold this functionality into remoting.MenuButton.
24 /** @suppress {duplicate} */
25 var remoting = remoting || {};
29 * @implements {remoting.WindowShape.ClientUI}
30 * @implements {remoting.ContextMenuAdapter}
31 * @param {HTMLElement} root The root of the context menu DOM.
32 * @param {remoting.WindowShape} windowShape
34 remoting.ContextMenuDom = function(root, windowShape) {
35 /** @private {HTMLElement} */
37 /** @private {HTMLElement} */
38 this.stub_ = /** @type {HTMLElement} */
39 (this.root_.querySelector('.context-menu-stub'));
40 /** @private {HTMLElement} */
41 this.icon_ = /** @type {HTMLElement} */
42 (this.root_.querySelector('.context-menu-icon'));
43 /** @private {HTMLElement} */
44 this.screen_ = /** @type {HTMLElement} */
45 (this.root_.querySelector('.context-menu-screen'));
46 /** @private {HTMLElement} */
47 this.menu_ = /** @type {HTMLElement} */ (this.root_.querySelector('ul'));
48 /** @private {number} */
50 /** @private {base.EventSourceImpl} */
51 this.eventSource_ = new base.EventSourceImpl();
52 /** @private {string} */
53 this.eventName_ = '_click';
55 * Since the same element is used to lock the icon open and to drag it, we
56 * must keep track of drag events so that the corresponding click event can
61 this.stubDragged_ = false;
64 this.windowShape_ = windowShape;
69 this.dragAndDrop_ = new remoting.DragAndDrop(
70 this.stub_, this.onDragUpdate_.bind(this));
72 this.eventSource_.defineEvents([this.eventName_]);
73 this.root_.addEventListener(
74 'transitionend', this.onTransitionEnd_.bind(this), false);
75 this.stub_.addEventListener('click', this.onStubClick_.bind(this), false);
76 this.icon_.addEventListener('click', this.onIconClick_.bind(this), false);
77 this.screen_.addEventListener('click', this.onIconClick_.bind(this), false);
79 this.root_.hidden = false;
80 this.root_.style.bottom = this.bottom_ + 'px';
81 this.windowShape_.registerClientUI(this);
84 remoting.ContextMenuDom.prototype.dispose = function() {
85 this.windowShape_.unregisterClientUI(this);
89 * @param {Array<{left: number, top: number, width: number, height: number}>}
90 * rects List of rectangles.
92 remoting.ContextMenuDom.prototype.addToRegion = function(rects) {
93 var rect = /** @type {ClientRect} */ (this.root_.getBoundingClientRect());
94 // Clip the menu position to the main window in case the screen size has
95 // changed or a recent drag event tried to move it out of bounds.
97 this.bottom_ += rect.top;
98 this.root_.style.bottom = this.bottom_ + 'px';
99 rect = this.root_.getBoundingClientRect();
103 if (this.root_.classList.contains('menu-opened')) {
105 /** @type {ClientRect} */ (this.menu_.getBoundingClientRect());
106 rects.push(menuRect);
111 * @param {string} id An identifier for the menu entry.
112 * @param {string} title The text to display in the menu.
113 * @param {boolean} isCheckable True if the state of this menu entry should
114 * have a check-box and manage its toggle state automatically. Note that
115 * checkable menu entries always start off unchecked.
116 * @param {string=} opt_parentId The id of the parent menu item for submenus.
118 remoting.ContextMenuDom.prototype.create = function(
119 id, title, isCheckable, opt_parentId) {
120 var menuEntry = /** @type {HTMLElement} */ (document.createElement('li'));
121 menuEntry.innerText = title;
122 menuEntry.setAttribute('data-id', id);
124 menuEntry.setAttribute('data-checkable', true);
126 menuEntry.addEventListener('click', this.onClick_.bind(this), false);
128 var insertBefore = null;
130 var parent = /** @type {HTMLElement} */
131 (this.menu_.querySelector('[data-id="' + opt_parentId + '"]'));
134 'No parent match for [data-id="' + /** @type {string} */(opt_parentId) +
136 console.assert(!parent.classList.contains('menu-group-item'),
137 'Nested sub-menus are not supported.');
138 parent.classList.add('menu-group-header');
139 menuEntry.classList.add('menu-group-item');
140 insertBefore = this.getInsertionPointForParent(
141 /** @type {string} */(opt_parentId));
143 this.menu_.insertBefore(menuEntry, insertBefore);
148 * @param {string} title
150 remoting.ContextMenuDom.prototype.updateTitle = function(id, title) {
151 var node = this.menu_.querySelector('[data-id="' + id + '"]');
153 node.innerText = title;
159 * @param {boolean} checked
161 remoting.ContextMenuDom.prototype.updateCheckState = function(id, checked) {
162 var node = /** @type {HTMLElement} */
163 (this.menu_.querySelector('[data-id="' + id + '"]'));
166 node.classList.add('selected');
168 node.classList.remove('selected');
176 remoting.ContextMenuDom.prototype.remove = function(id) {
177 var node = this.menu_.querySelector('[data-id="' + id + '"]');
179 this.menu_.removeChild(node);
184 * @param {function(OnClickData=):void} listener
186 remoting.ContextMenuDom.prototype.addListener = function(listener) {
187 this.eventSource_.addEventListener(this.eventName_, listener);
191 * @param {Event} event
194 remoting.ContextMenuDom.prototype.onClick_ = function(event) {
195 var element = /** @type {HTMLElement} */ (event.target);
196 if (element.getAttribute('data-checkable')) {
197 element.classList.toggle('selected')
200 menuItemId: element.getAttribute('data-id'),
201 checked: element.classList.contains('selected')
203 this.eventSource_.raiseEvent(this.eventName_, clickData);
208 * Get the insertion point for the specified sub-menu. This is the menu item
209 * immediately following the last child of that menu group, or null if there
210 * are no menu items after that group.
212 * @param {string} parentId
215 remoting.ContextMenuDom.prototype.getInsertionPointForParent = function(
217 var parentNode = this.menu_.querySelector('[data-id="' + parentId + '"]');
218 console.assert(parentNode != null,
219 'No parent match for [data-id="' + parentId +
220 '"] in getInsertionPointForParent().');
221 var childNode = /** @type {HTMLElement} */ (parentNode.nextSibling);
222 while (childNode != null && childNode.classList.contains('menu-group-item')) {
223 childNode = childNode.nextSibling;
229 * Called when the CSS show/hide transition completes. Since this changes the
230 * visible dimensions of the context menu, the visible region of the window
231 * needs to be recomputed.
235 remoting.ContextMenuDom.prototype.onTransitionEnd_ = function() {
236 this.windowShape_.updateClientWindowShape();
240 * Toggle the visibility of the context menu icon.
244 remoting.ContextMenuDom.prototype.onStubClick_ = function() {
245 if (this.stubDragged_) {
246 this.stubDragged_ = false;
249 this.root_.classList.toggle('opened');
253 * Toggle the visibility of the context menu.
257 remoting.ContextMenuDom.prototype.onIconClick_ = function() {
258 this.showMenu_(!this.menu_.classList.contains('opened'));
262 * Explicitly show or hide the context menu.
264 * @param {boolean} show True to show the menu; false to hide it.
267 remoting.ContextMenuDom.prototype.showMenu_ = function(show) {
269 // Ensure that the menu doesn't extend off the top or bottom of the
270 // screen by aligning it to the top or bottom of the icon, depending
271 // on the latter's vertical position.
273 /** @type {ClientRect} */ (this.menu_.getBoundingClientRect());
274 if (menuRect.bottom > window.innerHeight) {
275 this.menu_.classList.add('menu-align-bottom');
277 this.menu_.classList.remove('menu-align-bottom');
280 /** @type {remoting.ContextMenuDom} */
282 var onBlur = function() {
283 that.showMenu_(false);
284 window.removeEventListener('blur', onBlur, false);
286 window.addEventListener('blur', onBlur, false);
288 // Show the menu and prevent the icon from auto-hiding on mouse-out.
289 this.menu_.classList.add('opened');
290 this.root_.classList.add('menu-opened');
292 } else { // if (!show)
293 this.menu_.classList.remove('opened');
294 this.root_.classList.remove('menu-opened');
297 this.screen_.hidden = !show;
298 this.windowShape_.updateClientWindowShape();
302 * @param {number} deltaX
303 * @param {number} deltaY
306 remoting.ContextMenuDom.prototype.onDragUpdate_ = function(deltaX, deltaY) {
307 this.stubDragged_ = true;
308 this.bottom_ -= deltaY;
309 this.root_.style.bottom = this.bottom_ + 'px';
310 // Deferring the window shape update until the DOM update has completed
311 // helps keep the position of the context menu consistent with the window
312 // shape (though it's still not perfect).
313 window.requestAnimationFrame(
314 this.windowShape_.updateClientWindowShape.bind(this.windowShape_));