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
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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 guac-common-js.
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19 * Portions created by the Initial Developer are Copyright (C) 2010
20 * the Initial Developer. All Rights Reserved.
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36 * ***** END LICENSE BLOCK ***** */
38 // Guacamole namespace
39 var Guacamole = Guacamole || {};
42 * Dynamic on-screen keyboard. Given the URL to an XML keyboard layout file,
43 * this object will download and use the XML to construct a clickable on-screen
44 * keyboard with its own key events.
47 * @param {String} url The URL of an XML keyboard layout file.
49 Guacamole.OnScreenKeyboard = function(url) {
51 var on_screen_keyboard = this;
53 var scaledElements = [];
56 var currentModifier = 1;
58 // Returns a unique power-of-two value for the modifier with the
59 // given name. The same value will be returned for the same modifier.
60 function getModifier(name) {
62 var value = modifiers[name];
65 // Get current modifier, advance to next
66 value = currentModifier;
67 currentModifier <<= 1;
69 // Store value of this modifier
70 modifiers[name] = value;
78 function ScaledElement(element, width, height, scaleFont) {
83 this.scale = function(pixels) {
84 element.style.width = Math.floor(width * pixels) + "px";
85 element.style.height = Math.floor(height * pixels) + "px";
88 element.style.lineHeight = Math.floor(height * pixels) + "px";
89 element.style.fontSize = pixels + "px";
95 // For each child of element, call handler defined in next
96 function parseChildren(element, next) {
98 var children = element.childNodes;
99 for (var i=0; i<children.length; i++) {
102 var child = children[i];
104 // Do not parse text nodes
108 // Get handler for node
109 var handler = next[child.tagName];
111 // Call handler if defined
115 // Throw exception if no handler
118 "Unexpected " + child.tagName
119 + " within " + element.tagName
127 var keyboard = document.createElement("div");
128 keyboard.className = "guac-keyboard";
130 // Retrieve keyboard XML
131 var xmlhttprequest = new XMLHttpRequest();
132 xmlhttprequest.open("GET", url, false);
133 xmlhttprequest.send(null);
135 var xml = xmlhttprequest.responseXML;
139 function parse_row(e) {
141 var row = document.createElement("div");
142 row.className = "guac-keyboard-row";
146 "column": function(e) {
147 row.appendChild(parse_column(e));
150 "gap": function parse_gap(e) {
153 var gap_size = e.attributes["size"];
156 var gap = document.createElement("div");
157 gap.className = "guac-keyboard-gap";
162 gap_units = parseFloat(gap_size.value);
164 scaledElements.push(new ScaledElement(gap, gap_units, gap_units));
165 row.appendChild(gap);
169 "key": function parse_key(e) {
172 var key_size = e.attributes["size"];
175 var key_element = document.createElement("div");
176 key_element.className = "guac-keyboard-key";
178 // Position keys using container div
179 var key_container_element = document.createElement("div");
180 key_container_element.className = "guac-keyboard-key-container";
181 key_container_element.appendChild(key_element);
184 var key = new Guacamole.OnScreenKeyboard.Key();
189 key_units = parseFloat(key_size.value);
191 key.size = key_units;
194 "cap": function parse_cap(e) {
197 var required = e.attributes["if"];
198 var modifier = e.attributes["modifier"];
199 var keysym = e.attributes["keysym"];
200 var sticky = e.attributes["sticky"];
202 // Get content of key cap
203 var content = e.textContent;
206 var cap = new Guacamole.OnScreenKeyboard.Cap(content,
207 keysym ? keysym.value : null);
210 cap.modifier = modifier.value;
212 // Create cap element
213 var cap_element = document.createElement("div");
214 cap_element.className = "guac-keyboard-cap";
215 cap_element.textContent = content;
216 key_element.appendChild(cap_element);
218 // Get modifier value
219 var modifierValue = 0;
222 // Get modifier value for specified comma-delimited
223 // list of required modifiers.
224 var requirements = required.value.split(",");
225 for (var i=0; i<requirements.length; i++) {
226 modifierValue |= getModifier(requirements[i]);
227 cap_element.classList.add("guac-keyboard-requires-" + requirements[i]);
228 key_element.classList.add("guac-keyboard-uses-" + requirements[i]);
234 key.modifierMask |= modifierValue;
235 key.caps[modifierValue] = cap;
240 scaledElements.push(new ScaledElement(key_container_element, key_units, 1, true));
241 row.appendChild(key_container_element);
243 // Set up click handler for key
244 key_element.onclick = function() {
246 // Get current cap based on modifier state
247 var cap = key.getCap(on_screen_keyboard.modifiers);
249 // Update modifier state
252 // Toggle pressed state
253 key.pressed = !key.pressed;
255 // Construct classname for modifier
256 var modifierClass = "guac-keyboard-modifier-" + cap.modifier;
258 // Activate modifier if pressed
260 on_screen_keyboard.modifiers |= getModifier(cap.modifier);
261 keyboard.classList.add(modifierClass);
264 // Deactivate if not pressed
266 on_screen_keyboard.modifiers &= ~getModifier(cap.modifier);
267 keyboard.classList.remove(modifierClass);
272 // TODO: Send key event
284 function parse_column(e) {
286 var col = document.createElement("div");
287 col.className = "guac-keyboard-column";
289 var align = col.attributes["align"];
292 col.style.textAlign = align.value;
294 // Columns can only contain rows
297 col.appendChild(parse_row(e));
307 var keyboard_element = xml.documentElement;
308 if (keyboard_element.tagName != "keyboard")
309 throw new Error("Root element must be keyboard");
312 if (!keyboard_element.attributes["size"])
313 throw new Error("size attribute is required for keyboard");
315 var keyboard_size = parseFloat(keyboard_element.attributes["size"].value);
317 parseChildren(keyboard_element, {
320 keyboard.appendChild(parse_row(e));
323 "column": function(e) {
324 keyboard.appendChild(parse_column(e));
331 // Do not allow selection or mouse movement to propagate/register.
332 keyboard.onselectstart =
333 keyboard.onmousemove =
335 keyboard.onmousedown =
342 * State of all modifiers.
346 this.onkeypressed = null;
347 this.onkeyreleased = null;
349 this.getElement = function() {
353 this.resize = function(width) {
355 // Get pixel size of a unit
356 var unit = Math.floor(width / keyboard_size);
358 // Resize all scaled elements
359 for (var i=0; i<scaledElements.length; i++) {
360 var scaledElement = scaledElements[i];
361 scaledElement.scale(unit)
368 Guacamole.OnScreenKeyboard.Key = function() {
373 * Width of the key, relative to the size of the keyboard.
378 * Whether this key is currently pressed.
380 this.pressed = false;
383 * An associative map of all caps by modifier.
388 * Bit mask with all modifiers that affect this key set.
390 this.modifierMask = 0;
393 * Given the bitwise OR of all active modifiers, returns the key cap
396 this.getCap = function(modifier) {
397 return key.caps[modifier & key.modifierMask];
402 Guacamole.OnScreenKeyboard.Cap = function(text, keysym, modifier) {
405 * Modifier represented by this keycap
407 this.modifier = null;
410 * The text to be displayed within this keycap
415 * The keysym this cap sends when its associated key is pressed/released
417 this.keysym = keysym;
419 // Set modifier if provided
420 if (modifier) this.modifier = modifier;