diff options
Diffstat (limited to 'misc/openlayers/lib/OpenLayers/Handler/Hover.js')
-rw-r--r-- | misc/openlayers/lib/OpenLayers/Handler/Hover.js | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/misc/openlayers/lib/OpenLayers/Handler/Hover.js b/misc/openlayers/lib/OpenLayers/Handler/Hover.js new file mode 100644 index 0000000..18b81f4 --- /dev/null +++ b/misc/openlayers/lib/OpenLayers/Handler/Hover.js @@ -0,0 +1,180 @@ +/* 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" +}); |