a758b9f3e8
leaks by removing the circular references to buttons. git-svn-id: http://svn.openlayers.org/trunk/openlayers@24 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
124 lines
4.4 KiB
JavaScript
124 lines
4.4 KiB
JavaScript
// @require: core/util.js
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// @require: core/alphaImage.js
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//
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// default zoom/pan controls
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//
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OpenLayers.Control.PanZoom = Class.create();
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OpenLayers.Control.PanZoom.prototype =
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Object.extend( new OpenLayers.Control(), {
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// Array(...)
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buttons: null,
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initialize: function() {
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OpenLayers.Control.prototype.initialize.apply(this, arguments);
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},
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draw: function() {
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// initialize our internal div
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OpenLayers.Control.prototype.draw.apply(this);
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// place the controls
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this.buttons = new Array();
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var sz = new OpenLayers.Size(18,18);
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var xy = new OpenLayers.Pixel(4,4);
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var centered = new OpenLayers.Pixel(xy.x+sz.w/2, xy.y);
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this._addButton("panup", "north-mini.png", centered, sz);
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xy.y = centered.y+sz.h;
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this._addButton("panleft", "west-mini.png", xy, sz);
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this._addButton("panright", "east-mini.png", xy.addX(sz.w), sz);
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this._addButton("pandown", "south-mini.png", centered.addY(sz.h*2), sz);
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this._addButton("zoomin", "zoom-plus-mini.png", centered.addY(sz.h*3), sz);
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centered = centered.addY(sz.h*3);
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for (var i=this.map.getZoomLevels(); i--; i>=0) {
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centered = centered.addY(sz.h);
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this._addButton("zoomLevel"+i, "zoom-world-mini.png", centered, sz);
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}
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this._addButton("zoomout", "zoom-minus-mini.png", centered.addY(sz.h), sz);
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return this.div;
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},
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_addButton:function(id, img, xy, sz) {
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var imgLocation = OpenLayers.Util.getImagesLocation() + img;
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// var btn = new ol.AlphaImage("_"+id, imgLocation, xy, sz);
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var btn = OpenLayers.Util.createImage(
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imgLocation, sz, xy, "absolute",
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"OpenLayers_Control_PanZoom_" + id );
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//we want to add the outer div
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this.div.appendChild(btn);
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btn.onmousedown = this.buttonDown.bindAsEventListener(btn);
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btn.ondblclick = this.doubleClick.bindAsEventListener(btn);
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btn.action = id;
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btn.map = this.map;
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//we want to remember/reference the outer div
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this.buttons.push(btn);
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return btn;
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},
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doubleClick: function (evt) {
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Event.stop(evt);
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},
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buttonDown: function (evt) {
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if (this.action.startsWith("zoomLevel")) {
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this.map.zoomTo(parseInt(this.action.substr(9,this.action.length)));
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}
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switch (this.action) {
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case "zoomLevel0":
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this.map.zoomExtent();
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break;
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case "panup":
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var resolution = this.map.getResolution();
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var center = this.map.getCenter();
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this.map.setCenter(
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new OpenLayers.LatLon(center.lat + (resolution * 50),
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center.lon
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)
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);
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break;
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case "pandown":
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var resolution = this.map.getResolution();
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var center = this.map.getCenter();
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this.map.setCenter(
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new OpenLayers.LatLon(center.lat - (resolution * 50),
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center.lon
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)
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);
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break;
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case "panleft":
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var resolution = this.map.getResolution();
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var center = this.map.getCenter();
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this.map.setCenter(
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new OpenLayers.LatLon(center.lat,
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center.lon - (resolution * 50)
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)
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);
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break;
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case "panright":
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var resolution = this.map.getResolution();
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var center = this.map.getCenter();
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this.map.setCenter(
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new OpenLayers.LatLon(center.lat,
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center.lon + (resolution * 50)
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)
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);
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break;
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case "zoomin": this.map.zoomIn(); break;
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case "zoomout": this.map.zoomOut(); break;
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case "zoomextents": this.map.zoomExtent(); break;
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}
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Event.stop(evt);
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},
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destroy: function() {
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OpenLayers.Control.prototype.destroy.apply(this, arguments);
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for(i=0; i<this.buttons.length; i++) {
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this.buttons[i].map = null;
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}
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}
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});
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