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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/BaseTypes/Class.js
* @requires OpenLayers/Util.js
*/
/**
* Class: OpenLayers.Tile
* This is a class designed to designate a single tile, however
* it is explicitly designed to do relatively little. Tiles store
* information about themselves -- such as the URL that they are related
* to, and their size - but do not add themselves to the layer div
* automatically, for example. Create a new tile with the
* <OpenLayers.Tile> constructor, or a subclass.
*
* TBD 3.0 - remove reference to url in above paragraph
*
*/
OpenLayers.Tile = OpenLayers.Class({
/**
* APIProperty: events
* {<OpenLayers.Events>} An events object that handles all
* events on the tile.
*
* Register a listener for a particular event with the following syntax:
* (code)
* tile.events.register(type, obj, listener);
* (end)
*
* Supported event types:
* beforedraw - Triggered before the tile is drawn. Used to defer
* drawing to an animation queue. To defer drawing, listeners need
* to return false, which will abort drawing. The queue handler needs
* to call <draw>(true) to actually draw the tile.
* loadstart - Triggered when tile loading starts.
* loadend - Triggered when tile loading ends.
* loaderror - Triggered before the loadend event (i.e. when the tile is
* still hidden) if the tile could not be loaded.
* reload - Triggered when an already loading tile is reloaded.
* unload - Triggered before a tile is unloaded.
*/
events: null,
/**
* APIProperty: eventListeners
* {Object} If set as an option at construction, the eventListeners
* object will be registered with <OpenLayers.Events.on>. Object
* structure must be a listeners object as shown in the example for
* the events.on method.
*
* This options can be set in the ``tileOptions`` option from
* <OpenLayers.Layer.Grid>. For example, to be notified of the
* ``loadend`` event of each tiles:
* (code)
* new OpenLayers.Layer.OSM('osm', 'http://tile.openstreetmap.org/${z}/${x}/${y}.png', {
* tileOptions: {
* eventListeners: {
* 'loadend': function(evt) {
* // do something on loadend
* }
* }
* }
* });
* (end)
*/
eventListeners: null,
/**
* Property: id
* {String} null
*/
id: null,
/**
* Property: layer
* {<OpenLayers.Layer>} layer the tile is attached to
*/
layer: null,
/**
* Property: url
* {String} url of the request.
*
* TBD 3.0
* Deprecated. The base tile class does not need an url. This should be
* handled in subclasses. Does not belong here.
*/
url: null,
/**
* APIProperty: bounds
* {<OpenLayers.Bounds>} null
*/
bounds: null,
/**
* Property: size
* {<OpenLayers.Size>} null
*/
size: null,
/**
* Property: position
* {<OpenLayers.Pixel>} Top Left pixel of the tile
*/
position: null,
/**
* Property: isLoading
* {Boolean} Is the tile loading?
*/
isLoading: false,
/** TBD 3.0 -- remove 'url' from the list of parameters to the constructor.
* there is no need for the base tile class to have a url.
*/
/**
* Constructor: OpenLayers.Tile
* Constructor for a new <OpenLayers.Tile> instance.
*
* Parameters:
* layer - {<OpenLayers.Layer>} layer that the tile will go in.
* position - {<OpenLayers.Pixel>}
* bounds - {<OpenLayers.Bounds>}
* url - {<String>}
* size - {<OpenLayers.Size>}
* options - {Object}
*/
initialize: function(layer, position, bounds, url, size, options) {
this.layer = layer;
this.position = position.clone();
this.setBounds(bounds);
this.url = url;
if (size) {
this.size = size.clone();
}
//give the tile a unique id based on its BBOX.
this.id = OpenLayers.Util.createUniqueID("Tile_");
OpenLayers.Util.extend(this, options);
this.events = new OpenLayers.Events(this);
if (this.eventListeners instanceof Object) {
this.events.on(this.eventListeners);
}
},
/**
* Method: unload
* Call immediately before destroying if you are listening to tile
* events, so that counters are properly handled if tile is still
* loading at destroy-time. Will only fire an event if the tile is
* still loading.
*/
unload: function() {
if (this.isLoading) {
this.isLoading = false;
this.events.triggerEvent("unload");
}
},
/**
* APIMethod: destroy
* Nullify references to prevent circular references and memory leaks.
*/
destroy:function() {
this.layer = null;
this.bounds = null;
this.size = null;
this.position = null;
if (this.eventListeners) {
this.events.un(this.eventListeners);
}
this.events.destroy();
this.eventListeners = null;
this.events = null;
},
/**
* Method: draw
* Clear whatever is currently in the tile, then return whether or not
* it should actually be re-drawn. This is an example implementation
* that can be overridden by subclasses. The minimum thing to do here
* is to call <clear> and return the result from <shouldDraw>.
*
* Parameters:
* force - {Boolean} If true, the tile will not be cleared and no beforedraw
* event will be fired. This is used for drawing tiles asynchronously
* after drawing has been cancelled by returning false from a beforedraw
* listener.
*
* Returns:
* {Boolean} Whether or not the tile should actually be drawn. Returns null
* if a beforedraw listener returned false.
*/
draw: function(force) {
if (!force) {
//clear tile's contents and mark as not drawn
this.clear();
}
var draw = this.shouldDraw();
if (draw && !force && this.events.triggerEvent("beforedraw") === false) {
draw = null;
}
return draw;
},
/**
* Method: shouldDraw
* Return whether or not the tile should actually be (re-)drawn. The only
* case where we *wouldn't* want to draw the tile is if the tile is outside
* its layer's maxExtent
*
* Returns:
* {Boolean} Whether or not the tile should actually be drawn.
*/
shouldDraw: function() {
var withinMaxExtent = false,
maxExtent = this.layer.maxExtent;
if (maxExtent) {
var map = this.layer.map;
var worldBounds = map.baseLayer.wrapDateLine && map.getMaxExtent();
if (this.bounds.intersectsBounds(maxExtent, {inclusive: false, worldBounds: worldBounds})) {
withinMaxExtent = true;
}
}
return withinMaxExtent || this.layer.displayOutsideMaxExtent;
},
/**
* Method: setBounds
* Sets the bounds on this instance
*
* Parameters:
* bounds {<OpenLayers.Bounds>}
*/
setBounds: function(bounds) {
bounds = bounds.clone();
if (this.layer.map.baseLayer.wrapDateLine) {
var worldExtent = this.layer.map.getMaxExtent(),
tolerance = this.layer.map.getResolution();
bounds = bounds.wrapDateLine(worldExtent, {
leftTolerance: tolerance,
rightTolerance: tolerance
});
}
this.bounds = bounds;
},
/**
* Method: moveTo
* Reposition the tile.
*
* Parameters:
* bounds - {<OpenLayers.Bounds>}
* position - {<OpenLayers.Pixel>}
* redraw - {Boolean} Call draw method on tile after moving.
* Default is true
*/
moveTo: function (bounds, position, redraw) {
if (redraw == null) {
redraw = true;
}
this.setBounds(bounds);
this.position = position.clone();
if (redraw) {
this.draw();
}
},
/**
* Method: clear
* Clear the tile of any bounds/position-related data so that it can
* be reused in a new location.
*/
clear: function(draw) {
// to be extended by subclasses
},
CLASS_NAME: "OpenLayers.Tile"
});