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