202 lines
7.4 KiB
JavaScript
202 lines
7.4 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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// @require: OpenLayers/Control/PanZoom.js
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//
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// default zoom/pan controls
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//
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OpenLayers.Control.PanZoomBar = Class.create();
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OpenLayers.Control.PanZoomBar.X = 4;
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OpenLayers.Control.PanZoomBar.Y = 4;
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OpenLayers.Control.PanZoomBar.prototype =
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Object.extend( new OpenLayers.Control.PanZoom(), {
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/** @type Array(...) */
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buttons: null,
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/** @type int */
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zoomStopWidth: 18,
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/** @type int */
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zoomStopHeight: 11,
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initialize: function() {
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OpenLayers.Control.PanZoom.prototype.initialize.apply(this, arguments);
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this.position = new OpenLayers.Pixel(OpenLayers.Control.PanZoomBar.X,
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OpenLayers.Control.PanZoomBar.Y);
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},
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/**
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* @param {OpenLayers.Pixel} px
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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 = new Array();
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var sz = new OpenLayers.Size(18,18);
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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", centered.add(0, sz.h*2), sz);
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this._addButton("zoomin", "zoom-plus-mini.png", centered.add(0, sz.h*3+5), sz);
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centered = this._addZoomBar(centered.add(0, sz.h*4 + 5));
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this._addButton("zoomout", "zoom-minus-mini.png", centered, sz);
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return this.div;
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},
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/**
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* @param {OpenLayers.Pixel} location where zoombar drawing is to start.
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*/
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_addZoomBar:function(centered) {
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var imgLocation = OpenLayers.Util.getImagesLocation();
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var id = "OpenLayers_Control_PanZoomBar_Slider" + this.map.id;
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var slider = OpenLayers.Util.createAlphaImageDiv(id,
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centered.add(-1,
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(this.map.getZoomLevels())*this.zoomStopHeight),
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new OpenLayers.Size(20,9),
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imgLocation+"slider.png",
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"absolute");
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this.slider = slider;
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this.sliderEvents = new OpenLayers.Events(this, slider);
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this.sliderEvents.register("mousedown", this, this.zoomBarDown);
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this.sliderEvents.register("mousemove", this, this.zoomBarDrag);
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this.sliderEvents.register("mouseup", this, this.zoomBarUp);
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this.sliderEvents.register("dblclick", this, this.doubleClick);
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this.sliderEvents.register("click", this, this.doubleClick);
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sz = new OpenLayers.Size();
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sz.h = this.zoomStopHeight*(this.map.getZoomLevels()+1);
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sz.w = this.zoomStopWidth;
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var div = null
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if (OpenLayers.Util.alphaHack()) {
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var id = "OpenLayers_Control_PanZoomBar" + this.map.id;
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div = OpenLayers.Util.createAlphaImageDiv(id, centered,
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new OpenLayers.Size(sz.w,
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this.zoomStopHeight),
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imgLocation + "zoombar.png",
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"absolute", null, "crop");
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div.style.height = sz.h;
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} else {
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div = OpenLayers.Util.createDiv(
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'OpenLayers_Control_PanZoomBar_Zoombar' + this.map.id,
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centered,
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sz,
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imgLocation+"zoombar.png");
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}
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this.zoombarDiv = div;
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this.divEvents = new OpenLayers.Events(this, div);
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this.divEvents.register("mousedown", this, this.divClick);
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this.divEvents.register("mousemove", this, this.passEventToSlider);
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this.divEvents.register("dblclick", this, this.doubleClick);
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this.divEvents.register("click", this, this.doubleClick);
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this.div.appendChild(div);
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this.startTop = parseInt(div.style.top);
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this.div.appendChild(slider);
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this.map.events.register("zoomend", this, this.moveZoomBar);
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centered = centered.add(0,
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this.zoomStopHeight*(this.map.getZoomLevels()+1));
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return centered;
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},
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/*
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* @param evt
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* This function is used to pass events that happen on the div, or the map,
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* through to the slider, which then does its moving thing.
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*/
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passEventToSlider:function(evt) {
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this.sliderEvents.handleBrowserEvent(evt);
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},
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/*
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* divClick: Picks up on clicks directly on the zoombar div
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* and sets the zoom level appropriately.
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*/
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divClick: function (evt) {
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if (!Event.isLeftClick(evt)) return;
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var y = evt.xy.y;
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var top = Position.page(evt.object)[1];
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var levels = Math.floor((y - top)/this.zoomStopHeight);
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this.map.zoomTo(this.map.getZoomLevels() - levels);
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Event.stop(evt);
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},
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/*
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* @param evt
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* event listener for clicks on the slider
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*/
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zoomBarDown:function(evt) {
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if (!Event.isLeftClick(evt)) return;
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this.map.events.register("mousemove", this, this.passEventToSlider);
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this.map.events.register("mouseup", this, this.passEventToSlider);
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this.mouseDragStart = evt.xy.copyOf();
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this.zoomStart = evt.xy.copyOf();
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this.div.style.cursor = "move";
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Event.stop(evt);
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},
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/*
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* @param evt
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* This is what happens when a click has occurred, and the client is dragging.
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* Here we must ensure that the slider doesn't go beyond the bottom/top of the
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* zoombar div, as well as moving the slider to its new visual location
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*/
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zoomBarDrag:function(evt) {
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if (this.mouseDragStart != null) {
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var deltaY = this.mouseDragStart.y - evt.xy.y
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var offsets = Position.page(this.zoombarDiv);
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if ((evt.clientY - offsets[1]) > 0 &&
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(evt.clientY - offsets[1]) < parseInt(this.zoombarDiv.style.height) - 2) {
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var newTop = parseInt(this.slider.style.top) - deltaY;
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this.slider.style.top = newTop+"px";
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}
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this.mouseDragStart = evt.xy.copyOf();
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}
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Event.stop(evt);
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},
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/*
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* @param evt
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* Perform cleanup when a mouseup event is received -- discover new zoom level
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* and switch to it.
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*/
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zoomBarUp:function(evt) {
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if (!Event.isLeftClick(evt)) return;
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if (this.zoomStart) {
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this.div.style.cursor="default";
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this.map.events.remove("mousemove");
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this.map.events.remove("mouseup");
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var deltaY = this.zoomStart.y - evt.xy.y
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this.map.zoomTo(this.map.zoom + Math.round(deltaY/this.zoomStopHeight));
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this.moveZoomBar();
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this.mouseDragStart = null;
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Event.stop(evt);
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}
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},
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/*
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* Change the location of the slider to match the current zoom level.
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*/
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moveZoomBar:function() {
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var newTop =
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(this.map.getZoomLevels() - this.map.getZoom()) * this.zoomStopHeight
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+ this.startTop + 1;
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this.slider.style.top = newTop + "px";
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},
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CLASS_NAME: "OpenLayers.Control.PanZoomBar"
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});
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