Cleanup: Input code
File: input.js Tests Added: False (already present partially -- see below) Changes: - Fixed JSHint Errors - Converted to normal non-Crockford constructors NOTE: while there are tests for the actual key-detecting functionality, the tests do not cover the actual Keyboard and Mouse objects themselves.
This commit is contained in:
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713
include/input.js
713
include/input.js
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@ -5,397 +5,384 @@
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* Licensed under MPL 2.0 or any later version (see LICENSE.txt)
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*/
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/*jslint browser: true, white: false, bitwise: false */
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/*jslint browser: true, white: false */
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/*global window, Util */
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var Keyboard, Mouse;
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//
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// Keyboard event handler
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//
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(function () {
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"use strict";
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function Keyboard(defaults) {
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"use strict";
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//
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// Keyboard event handler
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//
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var that = {}, // Public API methods
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conf = {}, // Configuration attributes
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Keyboard = function (defaults) {
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this._keyDownList = []; // List of depressed keys
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// (even if they are happy)
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keyDownList = []; // List of depressed keys
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// (even if they are happy)
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Util.set_defaults(this, defaults, {
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'target': document,
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'focused': true
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});
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// Configuration attributes
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Util.conf_defaults(conf, that, defaults, [
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['target', 'wo', 'dom', document, 'DOM element that captures keyboard input'],
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['focused', 'rw', 'bool', true, 'Capture and send key events'],
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// create the keyboard handler
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this._handler = new KeyEventDecoder(kbdUtil.ModifierSync(),
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VerifyCharModifier( /* jshint newcap: false */
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TrackKeyState(
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EscapeModifiers(this._handleRfbEvent.bind(this))
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)
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)
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); /* jshint newcap: true */
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['onKeyPress', 'rw', 'func', null, 'Handler for key press/release']
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]);
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// keep these here so we can refer to them later
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this._eventHandlers = {
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'keyup': this._handleKeyUp.bind(this),
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'keydown': this._handleKeyDown.bind(this),
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'keypress': this._handleKeyPress.bind(this),
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'blur': this._allKeysUp.bind(this)
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};
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};
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Keyboard.prototype = {
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// private methods
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//
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// Private functions
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//
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/////// setup
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function onRfbEvent(evt) {
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if (conf.onKeyPress) {
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Util.Debug("onKeyPress " + (evt.type == 'keydown' ? "down" : "up")
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+ ", keysym: " + evt.keysym.keysym + "(" + evt.keysym.keyname + ")");
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conf.onKeyPress(evt.keysym.keysym, evt.type == 'keydown');
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}
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}
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// create the keyboard handler
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var k = KeyEventDecoder(kbdUtil.ModifierSync(),
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VerifyCharModifier(
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TrackKeyState(
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EscapeModifiers(onRfbEvent)
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)
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)
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);
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function onKeyDown(e) {
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if (! conf.focused) {
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return true;
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}
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if (k.keydown(e)) {
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// Suppress bubbling/default actions
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Util.stopEvent(e);
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return false;
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} else {
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// Allow the event to bubble and become a keyPress event which
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// will have the character code translated
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return true;
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}
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}
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function onKeyPress(e) {
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if (! conf.focused) {
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return true;
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}
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if (k.keypress(e)) {
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// Suppress bubbling/default actions
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Util.stopEvent(e);
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return false;
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} else {
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// Allow the event to bubble and become a keyPress event which
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// will have the character code translated
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return true;
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}
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}
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function onKeyUp(e) {
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if (! conf.focused) {
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return true;
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}
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if (k.keyup(e)) {
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// Suppress bubbling/default actions
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Util.stopEvent(e);
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return false;
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} else {
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// Allow the event to bubble and become a keyPress event which
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// will have the character code translated
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return true;
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}
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}
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function onOther(e) {
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k.syncModifiers(e);
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}
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function allKeysUp() {
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Util.Debug(">> Keyboard.allKeysUp");
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k.releaseAll();
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Util.Debug("<< Keyboard.allKeysUp");
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}
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//
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// Public API interface functions
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//
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that.grab = function() {
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//Util.Debug(">> Keyboard.grab");
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var c = conf.target;
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Util.addEvent(c, 'keydown', onKeyDown);
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Util.addEvent(c, 'keyup', onKeyUp);
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Util.addEvent(c, 'keypress', onKeyPress);
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// Release (key up) if window loses focus
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Util.addEvent(window, 'blur', allKeysUp);
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//Util.Debug("<< Keyboard.grab");
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};
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that.ungrab = function() {
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//Util.Debug(">> Keyboard.ungrab");
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var c = conf.target;
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Util.removeEvent(c, 'keydown', onKeyDown);
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Util.removeEvent(c, 'keyup', onKeyUp);
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Util.removeEvent(c, 'keypress', onKeyPress);
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Util.removeEvent(window, 'blur', allKeysUp);
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// Release (key up) all keys that are in a down state
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allKeysUp();
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//Util.Debug(">> Keyboard.ungrab");
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};
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that.sync = function(e) {
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k.syncModifiers(e);
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}
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return that; // Return the public API interface
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} // End of Keyboard()
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//
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// Mouse event handler
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//
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function Mouse(defaults) {
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"use strict";
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var that = {}, // Public API methods
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conf = {}, // Configuration attributes
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mouseCaptured = false;
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var doubleClickTimer = null,
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lastTouchPos = null;
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// Configuration attributes
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Util.conf_defaults(conf, that, defaults, [
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['target', 'ro', 'dom', document, 'DOM element that captures mouse input'],
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['notify', 'ro', 'func', null, 'Function to call to notify whenever a mouse event is received'],
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['focused', 'rw', 'bool', true, 'Capture and send mouse clicks/movement'],
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['scale', 'rw', 'float', 1.0, 'Viewport scale factor 0.0 - 1.0'],
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['onMouseButton', 'rw', 'func', null, 'Handler for mouse button click/release'],
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['onMouseMove', 'rw', 'func', null, 'Handler for mouse movement'],
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['touchButton', 'rw', 'int', 1, 'Button mask (1, 2, 4) for touch devices (0 means ignore clicks)']
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]);
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function captureMouse() {
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// capturing the mouse ensures we get the mouseup event
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if (conf.target.setCapture) {
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conf.target.setCapture();
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}
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// some browsers give us mouseup events regardless,
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// so if we never captured the mouse, we can disregard the event
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mouseCaptured = true;
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}
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function releaseMouse() {
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if (conf.target.releaseCapture) {
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conf.target.releaseCapture();
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}
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mouseCaptured = false;
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}
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//
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// Private functions
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//
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function resetDoubleClickTimer() {
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doubleClickTimer = null;
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}
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function onMouseButton(e, down) {
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var evt, pos, bmask;
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if (! conf.focused) {
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return true;
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}
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if (conf.notify) {
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conf.notify(e);
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}
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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if (e.touches || e.changedTouches) {
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// Touch device
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// When two touches occur within 500 ms of each other and are
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// closer than 20 pixels together a double click is triggered.
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if (down == 1) {
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if (doubleClickTimer == null) {
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lastTouchPos = pos;
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} else {
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clearTimeout(doubleClickTimer);
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// When the distance between the two touches is small enough
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// force the position of the latter touch to the position of
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// the first.
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var xs = lastTouchPos.x - pos.x;
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var ys = lastTouchPos.y - pos.y;
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var d = Math.sqrt((xs * xs) + (ys * ys));
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// The goal is to trigger on a certain physical width, the
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// devicePixelRatio brings us a bit closer but is not optimal.
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if (d < 20 * window.devicePixelRatio) {
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pos = lastTouchPos;
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}
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_handleRfbEvent: function (e) {
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if (this._onKeyPress) {
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Util.Debug("onKeyPress " + (e.type == 'keydown' ? "down" : "up") +
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", keysym: " + e.keysym.keysym + "(" + e.keysym.keyname + ")");
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this._onKeyPress(e.keysym.keysym, e.type == 'keydown');
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}
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doubleClickTimer = setTimeout(resetDoubleClickTimer, 500);
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},
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_handleKeyDown: function (e) {
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if (!this._focused) { return true; }
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if (this._handler.keydown(e)) {
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// Suppress bubbling/default actions
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Util.stopEvent(e);
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return false;
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} else {
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// Allow the event to bubble and become a keyPress event which
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// will have the character code translated
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return true;
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}
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},
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_handleKeyPress: function (e) {
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if (!this._focused) { return true; }
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if (this._handler.keypress(e)) {
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// Suppress bubbling/default actions
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Util.stopEvent(e);
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return false;
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} else {
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// Allow the event to bubble and become a keyPress event which
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// will have the character code translated
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return true;
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}
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},
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_handleKeyUp: function (e) {
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if (!this._focused) { return true; }
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if (this._handler.keyup(e)) {
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// Suppress bubbling/default actions
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Util.stopEvent(e);
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return false;
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} else {
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// Allow the event to bubble and become a keyPress event which
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// will have the character code translated
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return true;
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}
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},
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_allKeysUp: function () {
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Util.Debug(">> Keyboard.allKeysUp");
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this._handler.releaseAll();
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Util.Debug("<< Keyboard.allKeysUp");
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},
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// Public methods
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grab: function () {
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//Util.Debug(">> Keyboard.grab");
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var c = this._target;
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Util.addEvent(c, 'keydown', this._eventHandlers.keydown);
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Util.addEvent(c, 'keyup', this._eventHandlers.keyup);
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Util.addEvent(c, 'keypress', this._eventHandlers.keypress);
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// Release (key up) if window loses focus
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Util.addEvent(window, 'blur', this._eventHandlers.blur);
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//Util.Debug("<< Keyboard.grab");
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},
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ungrab: function () {
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//Util.Debug(">> Keyboard.ungrab");
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var c = this._target;
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Util.removeEvent(c, 'keydown', this._eventHandlers.keydown);
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Util.removeEvent(c, 'keyup', this._eventHandlers.keyup);
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Util.removeEvent(c, 'keypress', this._eventHandlers.keypress);
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Util.removeEvent(window, 'blur', this._eventHandlers.blur);
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// Release (key up) all keys that are in a down state
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this._allKeysUp();
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//Util.Debug(">> Keyboard.ungrab");
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},
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sync: function (e) {
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this._handler.syncModifiers(e);
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}
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bmask = conf.touchButton;
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// If bmask is set
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} else if (evt.which) {
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/* everything except IE */
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bmask = 1 << evt.button;
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} else {
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/* IE including 9 */
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bmask = (evt.button & 0x1) + // Left
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(evt.button & 0x2) * 2 + // Right
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(evt.button & 0x4) / 2; // Middle
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}
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//Util.Debug("mouse " + pos.x + "," + pos.y + " down: " + down +
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// " bmask: " + bmask + "(evt.button: " + evt.button + ")");
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if (conf.onMouseButton) {
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Util.Debug("onMouseButton " + (down ? "down" : "up") +
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", x: " + pos.x + ", y: " + pos.y + ", bmask: " + bmask);
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conf.onMouseButton(pos.x, pos.y, down, bmask);
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}
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Util.stopEvent(e);
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return false;
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}
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};
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function onMouseDown(e) {
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captureMouse();
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onMouseButton(e, 1);
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}
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Util.make_properties(Keyboard, [
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['target', 'wo', 'dom'], // DOM element that captures keyboard input
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['focused', 'rw', 'bool'], // Capture and send key events
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function onMouseUp(e) {
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if (!mouseCaptured) {
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return;
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}
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['onKeyPress', 'rw', 'func'] // Handler for key press/release
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]);
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onMouseButton(e, 0);
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releaseMouse();
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}
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//
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// Mouse event handler
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//
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function onMouseWheel(e) {
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var evt, pos, bmask, wheelData;
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if (! conf.focused) {
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return true;
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}
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if (conf.notify) {
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conf.notify(e);
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}
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Mouse = function (defaults) {
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this._mouseCaptured = false;
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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wheelData = evt.detail ? evt.detail * -1 : evt.wheelDelta / 40;
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if (wheelData > 0) {
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bmask = 1 << 3;
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} else {
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bmask = 1 << 4;
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}
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//Util.Debug('mouse scroll by ' + wheelData + ':' + pos.x + "," + pos.y);
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if (conf.onMouseButton) {
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conf.onMouseButton(pos.x, pos.y, 1, bmask);
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conf.onMouseButton(pos.x, pos.y, 0, bmask);
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}
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Util.stopEvent(e);
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return false;
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}
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this._doubleClickTimer = null;
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this._lastTouchPos = null;
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function onMouseMove(e) {
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var evt, pos;
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if (! conf.focused) {
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return true;
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}
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if (conf.notify) {
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conf.notify(e);
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}
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// Configuration attributes
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Util.set_defaults(this, defaults, {
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'target': document,
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'focused': true,
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'scale': 1.0,
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'touchButton': 1
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});
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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//Util.Debug('mouse ' + evt.which + '/' + evt.button + ' up:' + pos.x + "," + pos.y);
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if (conf.onMouseMove) {
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conf.onMouseMove(pos.x, pos.y);
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}
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Util.stopEvent(e);
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return false;
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}
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this._eventHandlers = {
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'mousedown': this._handleMouseDown.bind(this),
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'mouseup': this._handleMouseUp.bind(this),
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'mousemove': this._handleMouseMove.bind(this),
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'mousewheel': this._handleMouseWheel.bind(this),
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'mousedisable': this._handleMouseDisable.bind(this)
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};
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};
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function onMouseDisable(e) {
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var evt, pos;
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if (! conf.focused) {
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return true;
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}
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evt = (e ? e : window.event);
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pos = Util.getEventPosition(e, conf.target, conf.scale);
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/* Stop propagation if inside canvas area */
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if ((pos.realx >= 0) && (pos.realy >= 0) &&
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(pos.realx < conf.target.offsetWidth) &&
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(pos.realy < conf.target.offsetHeight)) {
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//Util.Debug("mouse event disabled");
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Util.stopEvent(e);
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return false;
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}
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//Util.Debug("mouse event not disabled");
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return true;
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}
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Mouse.prototype = {
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// private methods
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_captureMouse: function () {
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// capturing the mouse ensures we get the mouseup event
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if (this._target.setCapture) {
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this._target.setCapture();
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}
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//
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// Public API interface functions
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//
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// some browsers give us mouseup events regardless,
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// so if we never captured the mouse, we can disregard the event
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this._mouseCaptured = true;
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},
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that.grab = function() {
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//Util.Debug(">> Mouse.grab");
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var c = conf.target;
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_releaseMouse: function () {
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if (this._target.releaseCapture) {
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this._target.releaseCapture();
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}
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this._mouseCaptured = false;
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},
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if ('ontouchstart' in document.documentElement) {
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Util.addEvent(c, 'touchstart', onMouseDown);
|
||||
Util.addEvent(window, 'touchend', onMouseUp);
|
||||
Util.addEvent(c, 'touchend', onMouseUp);
|
||||
Util.addEvent(c, 'touchmove', onMouseMove);
|
||||
} else {
|
||||
Util.addEvent(c, 'mousedown', onMouseDown);
|
||||
Util.addEvent(window, 'mouseup', onMouseUp);
|
||||
Util.addEvent(c, 'mouseup', onMouseUp);
|
||||
Util.addEvent(c, 'mousemove', onMouseMove);
|
||||
Util.addEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
|
||||
onMouseWheel);
|
||||
}
|
||||
_resetDoubleClickTimer: function () {
|
||||
this._doubleClickTimer = null;
|
||||
},
|
||||
|
||||
/* Work around right and middle click browser behaviors */
|
||||
Util.addEvent(document, 'click', onMouseDisable);
|
||||
Util.addEvent(document.body, 'contextmenu', onMouseDisable);
|
||||
_handleMouseButton: function (e, down) {
|
||||
if (!this._focused) { return true; }
|
||||
|
||||
//Util.Debug("<< Mouse.grab");
|
||||
};
|
||||
if (this._notify) {
|
||||
this._notify(e);
|
||||
}
|
||||
|
||||
that.ungrab = function() {
|
||||
//Util.Debug(">> Mouse.ungrab");
|
||||
var c = conf.target;
|
||||
var evt = (e ? e : window.event);
|
||||
var pos = Util.getEventPosition(e, this._target, this._scale);
|
||||
|
||||
if ('ontouchstart' in document.documentElement) {
|
||||
Util.removeEvent(c, 'touchstart', onMouseDown);
|
||||
Util.removeEvent(window, 'touchend', onMouseUp);
|
||||
Util.removeEvent(c, 'touchend', onMouseUp);
|
||||
Util.removeEvent(c, 'touchmove', onMouseMove);
|
||||
} else {
|
||||
Util.removeEvent(c, 'mousedown', onMouseDown);
|
||||
Util.removeEvent(window, 'mouseup', onMouseUp);
|
||||
Util.removeEvent(c, 'mouseup', onMouseUp);
|
||||
Util.removeEvent(c, 'mousemove', onMouseMove);
|
||||
Util.removeEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
|
||||
onMouseWheel);
|
||||
}
|
||||
var bmask;
|
||||
if (e.touches || e.changedTouches) {
|
||||
// Touch device
|
||||
|
||||
/* Work around right and middle click browser behaviors */
|
||||
Util.removeEvent(document, 'click', onMouseDisable);
|
||||
Util.removeEvent(document.body, 'contextmenu', onMouseDisable);
|
||||
// When two touches occur within 500 ms of each other and are
|
||||
// closer than 20 pixels together a double click is triggered.
|
||||
if (down == 1) {
|
||||
if (this._doubleClickTimer === null) {
|
||||
this._lastTouchPos = pos;
|
||||
} else {
|
||||
clearTimeout(this._doubleClickTimer);
|
||||
|
||||
//Util.Debug(">> Mouse.ungrab");
|
||||
};
|
||||
// When the distance between the two touches is small enough
|
||||
// force the position of the latter touch to the position of
|
||||
// the first.
|
||||
|
||||
return that; // Return the public API interface
|
||||
var xs = this._lastTouchPos.x - pos.x;
|
||||
var ys = this._lastTouchPos.y - pos.y;
|
||||
var d = Math.sqrt((xs * xs) + (ys * ys));
|
||||
|
||||
} // End of Mouse()
|
||||
// The goal is to trigger on a certain physical width, the
|
||||
// devicePixelRatio brings us a bit closer but is not optimal.
|
||||
if (d < 20 * window.devicePixelRatio) {
|
||||
pos = this._lastTouchPos;
|
||||
}
|
||||
}
|
||||
this._doubleClickTimer = setTimeout(this._resetDoubleClickTimer.bind(this), 500);
|
||||
}
|
||||
bmask = this._touchButton;
|
||||
// If bmask is set
|
||||
} else if (evt.which) {
|
||||
/* everything except IE */
|
||||
bmask = 1 << evt.button;
|
||||
} else {
|
||||
/* IE including 9 */
|
||||
bmask = (evt.button & 0x1) + // Left
|
||||
(evt.button & 0x2) * 2 + // Right
|
||||
(evt.button & 0x4) / 2; // Middle
|
||||
}
|
||||
|
||||
if (this._onMouseButton) {
|
||||
Util.Debug("onMouseButton " + (down ? "down" : "up") +
|
||||
", x: " + pos.x + ", y: " + pos.y + ", bmask: " + bmask);
|
||||
this._onMouseButton(pos.x, pos.y, down, bmask);
|
||||
}
|
||||
Util.stopEvent(e);
|
||||
return false;
|
||||
},
|
||||
|
||||
_handleMouseDown: function (e) {
|
||||
this._captureMouse();
|
||||
this._handleMouseButton(e, 1);
|
||||
},
|
||||
|
||||
_handleMouseUp: function (e) {
|
||||
if (!this._mouseCaptured) { return; }
|
||||
|
||||
this._handleMouseButton(e, 0);
|
||||
this._releaseMouse();
|
||||
},
|
||||
|
||||
_handleMouseWheel: function (e) {
|
||||
if (!this._focused) { return true; }
|
||||
|
||||
if (this._notify) {
|
||||
this._notify(e);
|
||||
}
|
||||
|
||||
var evt = (e ? e : window.event);
|
||||
var pos = Util.getEventPosition(e, this._target, this._scale);
|
||||
var wheelData = evt.detail ? evt.detail * -1 : evt.wheelDelta / 40;
|
||||
var bmask;
|
||||
if (wheelData > 0) {
|
||||
bmask = 1 << 3;
|
||||
} else {
|
||||
bmask = 1 << 4;
|
||||
}
|
||||
|
||||
if (this._onMouseButton) {
|
||||
this._onMouseButton(pos.x, pos.y, 1, bmask);
|
||||
this._onMouseButton(pos.x, pos.y, 0, bmask);
|
||||
}
|
||||
Util.stopEvent(e);
|
||||
return false;
|
||||
},
|
||||
|
||||
_handleMouseMove: function (e) {
|
||||
if (! this._focused) { return true; }
|
||||
|
||||
if (this._notify) {
|
||||
this._notify(e);
|
||||
}
|
||||
|
||||
var evt = (e ? e : window.event);
|
||||
var pos = Util.getEventPosition(e, this._target, this._scale);
|
||||
if (this._onMouseMove) {
|
||||
this._onMouseMove(pos.x, pos.y);
|
||||
}
|
||||
Util.stopEvent(e);
|
||||
return false;
|
||||
},
|
||||
|
||||
_handleMouseDisable: function (e) {
|
||||
if (!this._focused) { return true; }
|
||||
|
||||
var evt = (e ? e : window.event);
|
||||
var pos = Util.getEventPosition(e, this._target, this._scale);
|
||||
|
||||
/* Stop propagation if inside canvas area */
|
||||
if ((pos.realx >= 0) && (pos.realy >= 0) &&
|
||||
(pos.realx < this._target.offsetWidth) &&
|
||||
(pos.realy < this._target.offsetHeight)) {
|
||||
//Util.Debug("mouse event disabled");
|
||||
Util.stopEvent(e);
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
},
|
||||
|
||||
|
||||
// Public methods
|
||||
grab: function () {
|
||||
var c = this._target;
|
||||
|
||||
if ('ontouchstart' in document.documentElement) {
|
||||
Util.addEvent(c, 'touchstart', this._eventHandlers.mousedown);
|
||||
Util.addEvent(window, 'touchend', this._eventHandlers.mouseup);
|
||||
Util.addEvent(c, 'touchend', this._eventHandlers.mouseup);
|
||||
Util.addEvent(c, 'touchmove', this._eventHandlers.mousemove);
|
||||
} else {
|
||||
Util.addEvent(c, 'mousedown', this._eventHandlers.mousedown);
|
||||
Util.addEvent(window, 'mouseup', this._eventHandlers.mouseup);
|
||||
Util.addEvent(c, 'mouseup', this._eventHandlers.mouseup);
|
||||
Util.addEvent(c, 'mousemove', this._eventHandlers.mousemove);
|
||||
Util.addEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
|
||||
this._eventHandlers.mousewheel);
|
||||
}
|
||||
|
||||
/* Work around right and middle click browser behaviors */
|
||||
Util.addEvent(document, 'click', this._eventHandlers.mousedisable);
|
||||
Util.addEvent(document.body, 'contextmenu', this._eventHandlers.mousedisable);
|
||||
},
|
||||
|
||||
ungrab: function () {
|
||||
var c = this._target;
|
||||
|
||||
if ('ontouchstart' in document.documentElement) {
|
||||
Util.removeEvent(c, 'touchstart', this._eventHandlers.mousedown);
|
||||
Util.removeEvent(window, 'touchend', this._eventHandlers.mouseup);
|
||||
Util.removeEvent(c, 'touchend', this._eventHandlers.mouseup);
|
||||
Util.removeEvent(c, 'touchmove', this._eventHandlers.mousemove);
|
||||
} else {
|
||||
Util.removeEvent(c, 'mousedown', this._eventHandlers.mousedown);
|
||||
Util.removeEvent(window, 'mouseup', this._eventHandlers.mouseup);
|
||||
Util.removeEvent(c, 'mouseup', this._eventHandlers.mouseup);
|
||||
Util.removeEvent(c, 'mousemove', this._eventHandlers.mousemove);
|
||||
Util.removeEvent(c, (Util.Engine.gecko) ? 'DOMMouseScroll' : 'mousewheel',
|
||||
this._eventHandlers.mousewheel);
|
||||
}
|
||||
|
||||
/* Work around right and middle click browser behaviors */
|
||||
Util.removeEvent(document, 'click', this._eventHandlers.mousedisable);
|
||||
Util.removeEvent(document.body, 'contextmenu', this._eventHandlers.mousedisable);
|
||||
|
||||
}
|
||||
};
|
||||
|
||||
Util.make_properties(Mouse, [
|
||||
['target', 'ro', 'dom'], // DOM element that captures mouse input
|
||||
['notify', 'ro', 'func'], // Function to call to notify whenever a mouse event is received
|
||||
['focused', 'rw', 'bool'], // Capture and send mouse clicks/movement
|
||||
['scale', 'rw', 'float'], // Viewport scale factor 0.0 - 1.0
|
||||
|
||||
['onMouseButton', 'rw', 'func'], // Handler for mouse button click/release
|
||||
['onMouseMove', 'rw', 'func'], // Handler for mouse movement
|
||||
['touchButton', 'rw', 'int'] // Button mask (1, 2, 4) for touch devices (0 means ignore clicks)
|
||||
]);
|
||||
})();
|
||||
|
|
Loading…
Reference in New Issue