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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the 2-clause BSD license.
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* See license.txt in the OpenLayers distribution or repository for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Control.js
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* @requires OpenLayers/Events/buttonclick.js
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*/
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/**
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* Class: OpenLayers.Control.PanZoom
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* The PanZoom is a visible control, composed of a
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* <OpenLayers.Control.PanPanel> and a <OpenLayers.Control.ZoomPanel>. By
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* default it is drawn in the upper left corner of the map.
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*
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* Inherits from:
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* - <OpenLayers.Control>
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*/
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OpenLayers.Control.PanZoom = OpenLayers.Class(OpenLayers.Control, {
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/**
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* APIProperty: slideFactor
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* {Integer} Number of pixels by which we'll pan the map in any direction
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* on clicking the arrow buttons. If you want to pan by some ratio
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* of the map dimensions, use <slideRatio> instead.
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*/
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slideFactor: 50,
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/**
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* APIProperty: slideRatio
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* {Number} The fraction of map width/height by which we'll pan the map
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* on clicking the arrow buttons. Default is null. If set, will
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* override <slideFactor>. E.g. if slideRatio is .5, then the Pan Up
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* button will pan up half the map height.
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*/
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slideRatio: null,
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/**
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* Property: buttons
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* {Array(DOMElement)} Array of Button Divs
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*/
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buttons: null,
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/**
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* Property: position
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* {<OpenLayers.Pixel>}
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*/
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position: null,
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/**
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* Constructor: OpenLayers.Control.PanZoom
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*
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* Parameters:
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* options - {Object}
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*/
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initialize: function(options) {
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this.position = new OpenLayers.Pixel(OpenLayers.Control.PanZoom.X,
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OpenLayers.Control.PanZoom.Y);
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OpenLayers.Control.prototype.initialize.apply(this, arguments);
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},
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/**
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* APIMethod: destroy
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*/
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destroy: function() {
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if (this.map) {
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this.map.events.unregister("buttonclick", this, this.onButtonClick);
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}
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this.removeButtons();
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this.buttons = null;
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this.position = null;
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OpenLayers.Control.prototype.destroy.apply(this, arguments);
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},
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/**
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* Method: setMap
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*
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* Properties:
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* map - {<OpenLayers.Map>}
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*/
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setMap: function(map) {
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OpenLayers.Control.prototype.setMap.apply(this, arguments);
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this.map.events.register("buttonclick", this, this.onButtonClick);
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},
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/**
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* Method: draw
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*
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* Parameters:
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* px - {<OpenLayers.Pixel>}
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*
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* Returns:
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* {DOMElement} A reference to the container div for the PanZoom control.
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*/
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draw: function(px) {
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// initialize our internal div
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OpenLayers.Control.prototype.draw.apply(this, arguments);
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px = this.position;
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// place the controls
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this.buttons = [];
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var sz = {w: 18, h: 18};
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var centered = new OpenLayers.Pixel(px.x+sz.w/2, px.y);
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this._addButton("panup", "north-mini.png", centered, sz);
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px.y = centered.y+sz.h;
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this._addButton("panleft", "west-mini.png", px, sz);
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this._addButton("panright", "east-mini.png", px.add(sz.w, 0), sz);
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this._addButton("pandown", "south-mini.png",
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centered.add(0, sz.h*2), sz);
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this._addButton("zoomin", "zoom-plus-mini.png",
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centered.add(0, sz.h*3+5), sz);
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this._addButton("zoomworld", "zoom-world-mini.png",
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centered.add(0, sz.h*4+5), sz);
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this._addButton("zoomout", "zoom-minus-mini.png",
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centered.add(0, sz.h*5+5), sz);
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return this.div;
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},
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/**
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* Method: _addButton
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*
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* Parameters:
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* id - {String}
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* img - {String}
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* xy - {<OpenLayers.Pixel>}
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* sz - {<OpenLayers.Size>}
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*
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* Returns:
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* {DOMElement} A Div (an alphaImageDiv, to be precise) that contains the
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* image of the button, and has all the proper event handlers set.
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*/
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_addButton:function(id, img, xy, sz) {
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var imgLocation = OpenLayers.Util.getImageLocation(img);
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var btn = OpenLayers.Util.createAlphaImageDiv(
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this.id + "_" + id,
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xy, sz, imgLocation, "absolute");
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btn.style.cursor = "pointer";
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//we want to add the outer div
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this.div.appendChild(btn);
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btn.action = id;
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btn.className = "olButton";
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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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/**
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* Method: _removeButton
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*
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* Parameters:
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* btn - {Object}
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*/
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_removeButton: function(btn) {
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this.div.removeChild(btn);
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OpenLayers.Util.removeItem(this.buttons, btn);
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},
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/**
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* Method: removeButtons
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*/
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removeButtons: function() {
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for(var i=this.buttons.length-1; i>=0; --i) {
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this._removeButton(this.buttons[i]);
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}
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},
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/**
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* Method: onButtonClick
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*
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* Parameters:
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* evt - {Event}
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*/
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onButtonClick: function(evt) {
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var btn = evt.buttonElement;
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switch (btn.action) {
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case "panup":
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this.map.pan(0, -this.getSlideFactor("h"));
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break;
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case "pandown":
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this.map.pan(0, this.getSlideFactor("h"));
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break;
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case "panleft":
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this.map.pan(-this.getSlideFactor("w"), 0);
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break;
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case "panright":
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this.map.pan(this.getSlideFactor("w"), 0);
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break;
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case "zoomin":
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this.map.zoomIn();
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break;
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case "zoomout":
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this.map.zoomOut();
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break;
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case "zoomworld":
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this.map.zoomToMaxExtent();
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break;
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}
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},
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/**
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* Method: getSlideFactor
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*
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* Parameters:
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* dim - {String} "w" or "h" (for width or height).
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*
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* Returns:
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* {Number} The slide factor for panning in the requested direction.
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*/
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getSlideFactor: function(dim) {
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return this.slideRatio ?
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this.map.getSize()[dim] * this.slideRatio :
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this.slideFactor;
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},
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CLASS_NAME: "OpenLayers.Control.PanZoom"
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});
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/**
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* Constant: X
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* {Integer}
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*/
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OpenLayers.Control.PanZoom.X = 4;
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/**
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* Constant: Y
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* {Integer}
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*/
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OpenLayers.Control.PanZoom.Y = 4;
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