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+/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
+ * full list of contributors). Published under the 2-clause BSD license.
+ * See license.txt in the OpenLayers distribution or repository for the
+ * full text of the license. */
+
+/**
+ * @requires OpenLayers/Handler.js
+ */
+
+/**
+ * Class: OpenLayers.Handler.Hover
+ * The hover handler is to be used to emulate mouseovers on objects
+ * on the map that aren't DOM elements. For example one can use
+ * this handler to send WMS/GetFeatureInfo requests as the user
+ * moves the mouve over the map.
+ *
+ * Inherits from:
+ * - <OpenLayers.Handler>
+ */
+OpenLayers.Handler.Hover = OpenLayers.Class(OpenLayers.Handler, {
+
+ /**
+ * APIProperty: delay
+ * {Integer} - Number of milliseconds between mousemoves before
+ * the event is considered a hover. Default is 500.
+ */
+ delay: 500,
+
+ /**
+ * APIProperty: pixelTolerance
+ * {Integer} - Maximum number of pixels between mousemoves for
+ * an event to be considered a hover. Default is null.
+ */
+ pixelTolerance: null,
+
+ /**
+ * APIProperty: stopMove
+ * {Boolean} - Stop other listeners from being notified on mousemoves.
+ * Default is false.
+ */
+ stopMove: false,
+
+ /**
+ * Property: px
+ * {<OpenLayers.Pixel>} - The location of the last mousemove, expressed
+ * in pixels.
+ */
+ px: null,
+
+ /**
+ * Property: timerId
+ * {Number} - The id of the timer.
+ */
+ timerId: null,
+
+ /**
+ * Constructor: OpenLayers.Handler.Hover
+ * Construct a hover handler.
+ *
+ * Parameters:
+ * control - {<OpenLayers.Control>} The control that initialized this
+ * handler. The control is assumed to have a valid map property; that
+ * map is used in the handler's own setMap method.
+ * callbacks - {Object} An object with keys corresponding to callbacks
+ * that will be called by the handler. The callbacks should
+ * expect to receive a single argument, the event. Callbacks for
+ * 'move', the mouse is moving, and 'pause', the mouse is pausing,
+ * are supported.
+ * options - {Object} An optional object whose properties will be set on
+ * the handler.
+ */
+
+ /**
+ * Method: mousemove
+ * Called when the mouse moves on the map.
+ *
+ * Parameters:
+ * evt - {<OpenLayers.Event>}
+ *
+ * Returns:
+ * {Boolean} Continue propagating this event.
+ */
+ mousemove: function(evt) {
+ if(this.passesTolerance(evt.xy)) {
+ this.clearTimer();
+ this.callback('move', [evt]);
+ this.px = evt.xy;
+ // clone the evt so original properties can be accessed even
+ // if the browser deletes them during the delay
+ evt = OpenLayers.Util.extend({}, evt);
+ this.timerId = window.setTimeout(
+ OpenLayers.Function.bind(this.delayedCall, this, evt),
+ this.delay
+ );
+ }
+ return !this.stopMove;
+ },
+
+ /**
+ * Method: mouseout
+ * Called when the mouse goes out of the map.
+ *
+ * Parameters:
+ * evt - {<OpenLayers.Event>}
+ *
+ * Returns:
+ * {Boolean} Continue propagating this event.
+ */
+ mouseout: function(evt) {
+ if (OpenLayers.Util.mouseLeft(evt, this.map.viewPortDiv)) {
+ this.clearTimer();
+ this.callback('move', [evt]);
+ }
+ return true;
+ },
+
+ /**
+ * Method: passesTolerance
+ * Determine whether the mouse move is within the optional pixel tolerance.
+ *
+ * Parameters:
+ * px - {<OpenLayers.Pixel>}
+ *
+ * Returns:
+ * {Boolean} The mouse move is within the pixel tolerance.
+ */
+ passesTolerance: function(px) {
+ var passes = true;
+ if(this.pixelTolerance && this.px) {
+ var dpx = Math.sqrt(
+ Math.pow(this.px.x - px.x, 2) +
+ Math.pow(this.px.y - px.y, 2)
+ );
+ if(dpx < this.pixelTolerance) {
+ passes = false;
+ }
+ }
+ return passes;
+ },
+
+ /**
+ * Method: clearTimer
+ * Clear the timer and set <timerId> to null.
+ */
+ clearTimer: function() {
+ if(this.timerId != null) {
+ window.clearTimeout(this.timerId);
+ this.timerId = null;
+ }
+ },
+
+ /**
+ * Method: delayedCall
+ * Triggers pause callback.
+ *
+ * Parameters:
+ * evt - {<OpenLayers.Event>}
+ */
+ delayedCall: function(evt) {
+ this.callback('pause', [evt]);
+ },
+
+ /**
+ * APIMethod: deactivate
+ * Deactivate the handler.
+ *
+ * Returns:
+ * {Boolean} The handler was successfully deactivated.
+ */
+ deactivate: function() {
+ var deactivated = false;
+ if(OpenLayers.Handler.prototype.deactivate.apply(this, arguments)) {
+ this.clearTimer();
+ deactivated = true;
+ }
+ return deactivated;
+ },
+
+ CLASS_NAME: "OpenLayers.Handler.Hover"
+});