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added option to the MouseWheel handler to trigger up/down events only

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when wheel is released. r=elemoine (closes #2345)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@9799 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
ahocevar
2009-11-16 10:38:26 +00:00
parent 33e39a205a
commit ebc5d7c021
4 changed files with 125 additions and 22 deletions
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57
lib/OpenLayers/Handler/MouseWheel.js
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@@ -28,6 +28,23 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
*/
mousePosition: null,
/**
* Property: interval
* {Integer} In order to increase server performance, an interval (in
* milliseconds) can be set to reduce the number of up/down events
* called. If set, a new up/down event will not be set until the
* interval has passed.
* Defaults to 0, meaning no interval.
*/
interval: 0,
/**
* Property: delta
* {Integer} When interval is set, delta collects the mousewheel z-deltas
* of the events that occur within the interval.
*/
delta: 0,
/**
* Constructor: OpenLayers.Handler.MouseWheel
*
@@ -138,7 +155,31 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
//
if (!overScrollableDiv && overMapDiv) {
if (overLayerDiv) {
this.wheelZoom(e);
var delta = 0;
if (!e) {
e = window.event;
}
if (e.wheelDelta) {
delta = e.wheelDelta/120;
if (window.opera && window.opera.version() < 9.2) {
delta = -delta;
}
} else if (e.detail) {
delta = -e.detail / 3;
}
this.delta = this.delta + delta;
if(this.interval) {
window.clearTimeout(this._timeoutId);
this._timeoutId = window.setTimeout(
OpenLayers.Function.bind(function(){
this.wheelZoom(e);
}, this),
this.interval
);
} else {
this.wheelZoom(e);
}
}
OpenLayers.Event.stop(e);
}
@@ -153,19 +194,9 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
* e - {Event}
*/
wheelZoom: function(e) {
var delta = this.delta;
this.delta = 0;
var delta = 0;
if (!e) {
e = window.event;
}
if (e.wheelDelta) {
delta = e.wheelDelta/120;
if (window.opera && window.opera.version() < 9.2) {
delta = -delta;
}
} else if (e.detail) {
delta = -e.detail / 3;
}
if (delta) {
// add the mouse position to the event because mozilla has
// a bug with clientX and clientY (see