2 /* ***** BEGIN LICENSE BLOCK *****
3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 * The contents of this file are subject to the Mozilla Public License Version
6 * 1.1 (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 * http://www.mozilla.org/MPL/
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
15 * The Original Code is guacamole-common-js.
17 * The Initial Developer of the Original Code is
19 * Portions created by the Initial Developer are Copyright (C) 2010
20 * the Initial Developer. All Rights Reserved.
24 * Alternatively, the contents of this file may be used under the terms of
25 * either the GNU General Public License Version 2 or later (the "GPL"), or
26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 * in which case the provisions of the GPL or the LGPL are applicable instead
28 * of those above. If you wish to allow use of your version of this file only
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30 * use your version of this file under the terms of the MPL, indicate your
31 * decision by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL or the LGPL. If you do not delete
33 * the provisions above, a recipient may use your version of this file under
34 * the terms of any one of the MPL, the GPL or the LGPL.
36 * ***** END LICENSE BLOCK ***** */
38 // Guacamole namespace
39 var Guacamole = Guacamole || {};
42 * Provides cross-browser mouse events for a given element. The events of
43 * the given element are automatically populated with handlers that translate
44 * mouse events into a non-browser-specific event provided by the
45 * Guacamole.Mouse instance.
47 * Touch events are translated into mouse events as if the touches occurred
48 * on a touchpad (drag to push the mouse pointer, tap to click).
51 * @param {Element} element The Element to use to provide mouse events.
53 Guacamole.Mouse = function(element) {
56 * Reference to this Guacamole.Mouse.
59 var guac_mouse = this;
62 * The distance a two-finger touch must move per scrollwheel event, in
65 this.scrollThreshold = 20 * (window.devicePixelRatio || 1);
68 * The maximum number of milliseconds to wait for a touch to end for the
69 * gesture to be considered a click.
71 this.clickTimingThreshold = 250;
74 * The maximum number of pixels to allow a touch to move for the gesture to
75 * be considered a click.
77 this.clickMoveThreshold = 10 * (window.devicePixelRatio || 1);
80 * The current mouse state. The properties of this state are updated when
81 * mouse events fire. This state object is also passed in as a parameter to
82 * the handler of any mouse events.
84 * @type Guacamole.Mouse.State
86 this.currentState = new Guacamole.Mouse.State(
88 false, false, false, false, false
92 * Fired whenever the user presses a mouse button down over the element
93 * associated with this Guacamole.Mouse.
96 * @param {Guacamole.Mouse.State} state The current mouse state.
98 this.onmousedown = null;
101 * Fired whenever the user releases a mouse button down over the element
102 * associated with this Guacamole.Mouse.
105 * @param {Guacamole.Mouse.State} state The current mouse state.
107 this.onmouseup = null;
110 * Fired whenever the user moves the mouse over the element associated with
111 * this Guacamole.Mouse.
114 * @param {Guacamole.Mouse.State} state The current mouse state.
116 this.onmousemove = null;
118 function cancelEvent(e) {
120 if (e.preventDefault) e.preventDefault();
121 e.returnValue = false;
124 function moveMouse(clientX, clientY) {
126 guac_mouse.currentState.x = clientX - element.offsetLeft;
127 guac_mouse.currentState.y = clientY - element.offsetTop;
129 // This is all JUST so we can get the mouse position within the element
130 var parent = element.offsetParent;
133 guac_mouse.currentState.x -= parent.offsetLeft - parent.scrollLeft;
134 guac_mouse.currentState.y -= parent.offsetTop - parent.scrollTop;
136 parent = parent.offsetParent;
139 if (guac_mouse.onmousemove)
140 guac_mouse.onmousemove(guac_mouse.currentState);
145 // Block context menu so right-click gets sent properly
146 element.addEventListener("contextmenu", function(e) {
150 element.addEventListener("mousemove", function(e) {
152 // Don't handle if we aren't supposed to
153 if (gesture_in_progress) return;
157 moveMouse(e.clientX, e.clientY);
162 var last_touch_x = 0;
163 var last_touch_y = 0;
164 var last_touch_time = 0;
165 var pixels_moved = 0;
166 var touch_distance = 0;
168 var touch_buttons = {
174 var gesture_in_progress = false;
175 var click_release_timeout = null;
177 element.addEventListener("touchend", function(e) {
179 // If we're handling a gesture AND this is the last touch
180 if (gesture_in_progress && e.touches.length == 0) {
184 var time = new Date().getTime();
186 // Get corresponding mouse button
187 var button = touch_buttons[touch_count];
189 // If mouse already down, release anad clear timeout
190 if (guac_mouse.currentState[button]) {
192 // Fire button up event
193 guac_mouse.currentState[button] = false;
194 if (guac_mouse.onmouseup)
195 guac_mouse.onmouseup(guac_mouse.currentState);
197 // Clear timeout, if set
198 if (click_release_timeout) {
199 window.clearTimeout(click_release_timeout);
200 click_release_timeout = null;
205 // If single tap detected (based on time and distance)
206 if (time - last_touch_time <= guac_mouse.clickTimingThreshold
207 && pixels_moved < guac_mouse.clickMoveThreshold) {
209 // Fire button down event
210 guac_mouse.currentState[button] = true;
211 if (guac_mouse.onmousedown)
212 guac_mouse.onmousedown(guac_mouse.currentState);
214 // Delay mouse up - mouse up should be canceled if
215 // touchstart within timeout.
216 click_release_timeout = window.setTimeout(function() {
218 // Fire button up event
219 guac_mouse.currentState[button] = false;
220 if (guac_mouse.onmouseup)
221 guac_mouse.onmouseup(guac_mouse.currentState);
223 // Allow mouse events now that touching is over
224 gesture_in_progress = false;
226 }, guac_mouse.clickTimingThreshold);
234 element.addEventListener("touchstart", function(e) {
236 // Track number of touches, but no more than three
237 touch_count = Math.min(e.touches.length, 3);
239 // Record initial touch location and time for touch movement
241 if (e.touches.length == 1) {
245 // Stop mouse events while touching
246 gesture_in_progress = true;
248 // Clear timeout, if set
249 if (click_release_timeout) {
250 window.clearTimeout(click_release_timeout);
251 click_release_timeout = null;
254 // Record touch location and time
255 var starting_touch = e.touches[0];
256 last_touch_x = starting_touch.clientX;
257 last_touch_y = starting_touch.clientY;
258 last_touch_time = new Date().getTime();
265 element.addEventListener("touchmove", function(e) {
269 // Get change in touch location
270 var touch = e.touches[0];
271 var delta_x = touch.clientX - last_touch_x;
272 var delta_y = touch.clientY - last_touch_y;
274 // Track pixels moved
275 pixels_moved += Math.abs(delta_x) + Math.abs(delta_y);
277 // If only one touch involved, this is mouse move
278 if (touch_count == 1) {
280 // Calculate average velocity in Manhatten pixels per millisecond
281 var velocity = pixels_moved / (new Date().getTime() - last_touch_time);
283 // Scale mouse movement relative to velocity
284 var scale = 1 + velocity;
286 // Update mouse location
287 guac_mouse.currentState.x += delta_x*scale;
288 guac_mouse.currentState.y += delta_y*scale;
290 // Prevent mouse from leaving screen
292 if (guac_mouse.currentState.x < 0)
293 guac_mouse.currentState.x = 0;
294 else if (guac_mouse.currentState.x >= element.offsetWidth)
295 guac_mouse.currentState.x = element.offsetWidth - 1;
297 if (guac_mouse.currentState.y < 0)
298 guac_mouse.currentState.y = 0;
299 else if (guac_mouse.currentState.y >= element.offsetHeight)
300 guac_mouse.currentState.y = element.offsetHeight - 1;
302 // Fire movement event, if defined
303 if (guac_mouse.onmousemove)
304 guac_mouse.onmousemove(guac_mouse.currentState);
306 // Update touch location
307 last_touch_x = touch.clientX;
308 last_touch_y = touch.clientY;
312 // Interpret two-finger swipe as scrollwheel
313 else if (touch_count == 2) {
315 // If change in location passes threshold for scroll
316 if (Math.abs(delta_y) >= guac_mouse.scrollThreshold) {
318 // Decide button based on Y movement direction
320 if (delta_y > 0) button = "down";
323 // Fire button down event
324 guac_mouse.currentState[button] = true;
325 if (guac_mouse.onmousedown)
326 guac_mouse.onmousedown(guac_mouse.currentState);
328 // Fire button up event
329 guac_mouse.currentState[button] = false;
330 if (guac_mouse.onmouseup)
331 guac_mouse.onmouseup(guac_mouse.currentState);
333 // Only update touch location after a scroll has been
335 last_touch_x = touch.clientX;
336 last_touch_y = touch.clientY;
345 element.addEventListener("mousedown", function(e) {
347 // Don't handle if we aren't supposed to
348 if (gesture_in_progress) return;
354 guac_mouse.currentState.left = true;
357 guac_mouse.currentState.middle = true;
360 guac_mouse.currentState.right = true;
364 if (guac_mouse.onmousedown)
365 guac_mouse.onmousedown(guac_mouse.currentState);
370 element.addEventListener("mouseup", function(e) {
372 // Don't handle if we aren't supposed to
373 if (gesture_in_progress) return;
379 guac_mouse.currentState.left = false;
382 guac_mouse.currentState.middle = false;
385 guac_mouse.currentState.right = false;
389 if (guac_mouse.onmouseup)
390 guac_mouse.onmouseup(guac_mouse.currentState);
394 element.addEventListener("mouseout", function(e) {
396 // Don't handle if we aren't supposed to
397 if (gesture_in_progress) return;
399 // Get parent of the element the mouse pointer is leaving
400 if (!e) e = window.event;
402 // Check that mouseout is due to actually LEAVING the element
403 var target = e.relatedTarget || e.toElement;
404 while (target != null) {
405 if (target === element)
407 target = target.parentNode;
412 // Release all buttons
413 if (guac_mouse.currentState.left
414 || guac_mouse.currentState.middle
415 || guac_mouse.currentState.right) {
417 guac_mouse.currentState.left = false;
418 guac_mouse.currentState.middle = false;
419 guac_mouse.currentState.right = false;
421 if (guac_mouse.onmouseup)
422 guac_mouse.onmouseup(guac_mouse.currentState);
427 // Override selection on mouse event element.
428 element.addEventListener("selectstart", function(e) {
432 // Scroll wheel support
433 function mousewheel_handler(e) {
435 // Don't handle if we aren't supposed to
436 if (gesture_in_progress) return;
441 else if (e.wheelDelta)
442 delta = -event.wheelDelta;
446 if (guac_mouse.onmousedown) {
447 guac_mouse.currentState.up = true;
448 guac_mouse.onmousedown(guac_mouse.currentState);
451 if (guac_mouse.onmouseup) {
452 guac_mouse.currentState.up = false;
453 guac_mouse.onmouseup(guac_mouse.currentState);
459 if (guac_mouse.onmousedown) {
460 guac_mouse.currentState.down = true;
461 guac_mouse.onmousedown(guac_mouse.currentState);
464 if (guac_mouse.onmouseup) {
465 guac_mouse.currentState.down = false;
466 guac_mouse.onmouseup(guac_mouse.currentState);
473 element.addEventListener('DOMMouseScroll', mousewheel_handler, false);
474 element.addEventListener('mousewheel', mousewheel_handler, false);
479 * Simple container for properties describing the state of a mouse.
482 * @param {Number} x The X position of the mouse pointer in pixels.
483 * @param {Number} y The Y position of the mouse pointer in pixels.
484 * @param {Boolean} left Whether the left mouse button is pressed.
485 * @param {Boolean} middle Whether the middle mouse button is pressed.
486 * @param {Boolean} right Whether the right mouse button is pressed.
487 * @param {Boolean} up Whether the up mouse button is pressed (the fourth
488 * button, usually part of a scroll wheel).
489 * @param {Boolean} down Whether the down mouse button is pressed (the fifth
490 * button, usually part of a scroll wheel).
492 Guacamole.Mouse.State = function(x, y, left, middle, right, up, down) {
495 * The current X position of the mouse pointer.
501 * The current Y position of the mouse pointer.
507 * Whether the left mouse button is currently pressed.
513 * Whether the middle mouse button is currently pressed.
519 * Whether the right mouse button is currently pressed.
525 * Whether the up mouse button is currently pressed. This is the fourth
526 * mouse button, associated with upward scrolling of the mouse scroll
533 * Whether the down mouse button is currently pressed. This is the fifth
534 * mouse button, associated with downward scrolling of the mouse scroll