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| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Tile.js
*/
/**
* Class: OpenLayers.Tile.Image
* Instances of OpenLayers.Tile.Image are used to manage the image tiles
* used by various layers. Create a new image tile with the
* <OpenLayers.Tile.Image> constructor.
*
* Inherits from:
* - <OpenLayers.Tile>
*/
OpenLayers.Tile.Image = OpenLayers.Class(OpenLayers.Tile, {
/**
* Property: url
* {String} The URL of the image being requested. No default. Filled in by
* layer.getURL() function.
*/
url: null,
/**
* Property: imgDiv
* {DOMElement} The div element which wraps the image.
*/
imgDiv: null,
/**
* Property: frame
* {DOMElement} The image element is appended to the frame. Any gutter on
* the image will be hidden behind the frame.
*/
frame: null,
/**
* Property: layerAlphaHack
* {Boolean} True if the png alpha hack needs to be applied on the layer's div.
*/
layerAlphaHack: null,
/**
* Property: isBackBuffer
* {Boolean} Is this tile a back buffer tile?
*/
isBackBuffer: false,
/**
* Property: lastRatio
* {Float} Used in transition code only. This is the previous ratio
* of the back buffer tile resolution to the map resolution. Compared
* with the current ratio to determine if zooming occurred.
*/
lastRatio: 1,
/**
* Property: isFirstDraw
* {Boolean} Is this the first time the tile is being drawn?
* This is used to force resetBackBuffer to synchronize
* the backBufferTile with the foreground tile the first time
* the foreground tile loads so that if the user zooms
* before the layer has fully loaded, the backBufferTile for
* tiles that have been loaded can be used.
*/
isFirstDraw: true,
/**
* Property: backBufferTile
* {<OpenLayers.Tile>} A clone of the tile used to create transition
* effects when the tile is moved or changes resolution.
*/
backBufferTile: null,
/** TBD 3.0 - reorder the parameters to the init function to remove
* URL. the getUrl() function on the layer gets called on
* each draw(), so no need to specify it here.
*
* Constructor: OpenLayers.Tile.Image
* Constructor for a new <OpenLayers.Tile.Image> instance.
*
* Parameters:
* layer - {<OpenLayers.Layer>} layer that the tile will go in.
* position - {<OpenLayers.Pixel>}
* bounds - {<OpenLayers.Bounds>}
* url - {<String>} Deprecated. Remove me in 3.0.
* size - {<OpenLayers.Size>}
*/
initialize: function(layer, position, bounds, url, size) {
OpenLayers.Tile.prototype.initialize.apply(this, arguments);
this.url = url; //deprecated remove me
this.frame = document.createElement('div');
this.frame.style.overflow = 'hidden';
this.frame.style.position = 'absolute';
this.layerAlphaHack = this.layer.alpha && OpenLayers.Util.alphaHack();
},
/**
* APIMethod: destroy
* nullify references to prevent circular references and memory leaks
*/
destroy: function() {
if (this.imgDiv != null) {
if (this.layerAlphaHack) {
// unregister the "load" handler
OpenLayers.Event.stopObservingElement(this.imgDiv.childNodes[0]);
}
// unregister the "load" and "error" handlers. Only the "error" handler if
// this.layerAlphaHack is true.
OpenLayers.Event.stopObservingElement(this.imgDiv);
if (this.imgDiv.parentNode == this.frame) {
this.frame.removeChild(this.imgDiv);
this.imgDiv.map = null;
}
this.imgDiv.urls = null;
// abort any currently loading image
this.imgDiv.src = OpenLayers.Util.getImagesLocation() + "blank.gif";
}
this.imgDiv = null;
if ((this.frame != null) && (this.frame.parentNode == this.layer.div)) {
this.layer.div.removeChild(this.frame);
}
this.frame = null;
/* clean up the backBufferTile if it exists */
if (this.backBufferTile) {
this.backBufferTile.destroy();
this.backBufferTile = null;
}
this.layer.events.unregister("loadend", this, this.resetBackBuffer);
OpenLayers.Tile.prototype.destroy.apply(this, arguments);
},
/**
* Method: clone
*
* Parameters:
* obj - {<OpenLayers.Tile.Image>} The tile to be cloned
*
* Returns:
* {<OpenLayers.Tile.Image>} An exact clone of this <OpenLayers.Tile.Image>
*/
clone: function (obj) {
if (obj == null) {
obj = new OpenLayers.Tile.Image(this.layer,
this.position,
this.bounds,
this.url,
this.size);
}
//pick up properties from superclass
obj = OpenLayers.Tile.prototype.clone.apply(this, [obj]);
//dont want to directly copy the image div
obj.imgDiv = null;
return obj;
},
/**
* Method: draw
* Check that a tile should be drawn, and draw it.
*
* Returns:
* {Boolean} Always returns true.
*/
draw: function() {
if (this.layer != this.layer.map.baseLayer && this.layer.reproject) {
this.bounds = this.getBoundsFromBaseLayer(this.position);
}
var drawTile = OpenLayers.Tile.prototype.draw.apply(this, arguments);
if ((OpenLayers.Util.indexOf(this.layer.SUPPORTED_TRANSITIONS, this.layer.transitionEffect) != -1) ||
this.layer.singleTile) {
if (drawTile) {
//we use a clone of this tile to create a double buffer for visual
//continuity. The backBufferTile is used to create transition
//effects while the tile in the grid is repositioned and redrawn
if (!this.backBufferTile) {
this.backBufferTile = this.clone();
this.backBufferTile.hide();
// this is important. It allows the backBuffer to place itself
// appropriately in the DOM. The Image subclass needs to put
// the backBufferTile behind the main tile so the tiles can
// load over top and display as soon as they are loaded.
this.backBufferTile.isBackBuffer = true;
// potentially end any transition effects when the tile loads
this.events.register('loadend', this, this.resetBackBuffer);
// clear transition back buffer tile only after all tiles in
// this layer have loaded to avoid visual glitches
this.layer.events.register("loadend", this, this.resetBackBuffer);
}
// run any transition effects
this.startTransition();
} else {
// if we aren't going to draw the tile, then the backBuffer should
// be hidden too!
if (this.backBufferTile) {
this.backBufferTile.clear();
}
}
} else {
if (drawTile && this.isFirstDraw) {
this.events.register('loadend', this, this.showTile);
this.isFirstDraw = false;
}
}
if (!drawTile) {
return false;
}
if (this.isLoading) {
//if we're already loading, send 'reload' instead of 'loadstart'.
this.events.triggerEvent("reload");
} else {
this.isLoading = true;
this.events.triggerEvent("loadstart");
}
return this.renderTile();
},
/**
* Method: resetBackBuffer
* Triggered by two different events, layer loadend, and tile loadend.
* In any of these cases, we check to see if we can hide the
* backBufferTile yet and update its parameters to match the
* foreground tile.
*
* Basic logic:
* - If the backBufferTile hasn't been drawn yet, reset it
* - If layer is still loading, show foreground tile but don't hide
* the backBufferTile yet
* - If layer is done loading, reset backBuffer tile and show
* foreground tile
*/
resetBackBuffer: function() {
this.showTile();
if (this.backBufferTile &&
(this.isFirstDraw || !this.layer.numLoadingTiles)) {
this.isFirstDraw = false;
// check to see if the backBufferTile is within the max extents
// before rendering it
var maxExtent = this.layer.maxExtent;
var withinMaxExtent = (maxExtent &&
this.bounds.intersectsBounds(maxExtent, false));
if (withinMaxExtent) {
this.backBufferTile.position = this.position;
this.backBufferTile.bounds = this.bounds;
this.backBufferTile.size = this.size;
this.backBufferTile.imageSize = this.layer.getImageSize(this.bounds) || this.size;
this.backBufferTile.imageOffset = this.layer.imageOffset;
this.backBufferTile.resolution = this.layer.getResolution();
this.backBufferTile.renderTile();
}
this.backBufferTile.hide();
}
},
/**
* Method: renderTile
* Internal function to actually initialize the image tile,
* position it correctly, and set its url.
*/
renderTile: function() {
if (this.imgDiv == null) {
this.initImgDiv();
}
this.imgDiv.viewRequestID = this.layer.map.viewRequestID;
if (this.layer.async) {
// Asyncronous image requests call the asynchronous getURL method
// on the layer to fetch an image that covers 'this.bounds', in the scope of
// 'this', setting the 'url' property of the layer itself, and running
// the callback 'positionFrame' when the image request returns.
this.layer.getURLasync(this.bounds, this, "url", this.positionImage);
} else {
// syncronous image requests get the url and position the frame immediately,
// and don't wait for an image request to come back.
// needed for changing to a different server for onload error
if (this.layer.url instanceof Array) {
this.imgDiv.urls = this.layer.url.slice();
}
this.url = this.layer.getURL(this.bounds);
// position the frame immediately
this.positionImage();
}
return true;
},
/**
* Method: positionImage
* Using the properties currenty set on the layer, position the tile correctly.
* This method is used both by the async and non-async versions of the Tile.Image
* code.
*/
positionImage: function() {
// if the this layer doesn't exist at the point the image is
// returned, do not attempt to use it for size computation
if (this.layer === null) {
return;
}
// position the frame
OpenLayers.Util.modifyDOMElement(this.frame,
null, this.position, this.size);
var imageSize = this.layer.getImageSize(this.bounds);
if (this.layerAlphaHack) {
OpenLayers.Util.modifyAlphaImageDiv(this.imgDiv,
null, null, imageSize, this.url);
} else {
OpenLayers.Util.modifyDOMElement(this.imgDiv,
null, null, imageSize) ;
this.imgDiv.src = this.url;
}
},
/**
* Method: clear
* Clear the tile of any bounds/position-related data so that it can
* be reused in a new location.
*/
clear: function() {
if(this.imgDiv) {
this.hide();
if (OpenLayers.Tile.Image.useBlankTile) {
this.imgDiv.src = OpenLayers.Util.getImagesLocation() + "blank.gif";
}
}
},
/**
* Method: initImgDiv
* Creates the imgDiv property on the tile.
*/
initImgDiv: function() {
var offset = this.layer.imageOffset;
var size = this.layer.getImageSize(this.bounds);
if (this.layerAlphaHack) {
this.imgDiv = OpenLayers.Util.createAlphaImageDiv(null,
offset,
size,
null,
"relative",
null,
null,
null,
true);
} else {
this.imgDiv = OpenLayers.Util.createImage(null,
offset,
size,
null,
"relative",
null,
null,
true);
}
this.imgDiv.className = 'olTileImage';
/* checkImgURL used to be used to called as a work around, but it
ended up hiding problems instead of solving them and broke things
like relative URLs. See discussion on the dev list:
http://openlayers.org/pipermail/dev/2007-January/000205.html
OpenLayers.Event.observe( this.imgDiv, "load",
OpenLayers.Function.bind(this.checkImgURL, this) );
*/
this.frame.style.zIndex = this.isBackBuffer ? 0 : 1;
this.frame.appendChild(this.imgDiv);
this.layer.div.appendChild(this.frame);
if(this.layer.opacity != null) {
OpenLayers.Util.modifyDOMElement(this.imgDiv, null, null, null,
null, null, null,
this.layer.opacity);
}
// we need this reference to check back the viewRequestID
this.imgDiv.map = this.layer.map;
//bind a listener to the onload of the image div so that we
// can register when a tile has finished loading.
var onload = function() {
//normally isLoading should always be true here but there are some
// right funky conditions where loading and then reloading a tile
// with the same url *really*fast*. this check prevents sending
// a 'loadend' if the msg has already been sent
//
if (this.isLoading) {
this.isLoading = false;
this.events.triggerEvent("loadend");
}
};
if (this.layerAlphaHack) {
OpenLayers.Event.observe(this.imgDiv.childNodes[0], 'load',
OpenLayers.Function.bind(onload, this));
} else {
OpenLayers.Event.observe(this.imgDiv, 'load',
OpenLayers.Function.bind(onload, this));
}
// Bind a listener to the onerror of the image div so that we
// can registere when a tile has finished loading with errors.
var onerror = function() {
// If we have gone through all image reload attempts, it is time
// to realize that we are done with this image. Since
// OpenLayers.Util.onImageLoadError already has taken care about
// the error, we can continue as if the image was loaded
// successfully.
if (this.imgDiv._attempts > OpenLayers.IMAGE_RELOAD_ATTEMPTS) {
onload.call(this);
}
};
OpenLayers.Event.observe(this.imgDiv, "error",
OpenLayers.Function.bind(onerror, this));
},
/**
* Method: checkImgURL
* Make sure that the image that just loaded is the one this tile is meant
* to display, since panning/zooming might have changed the tile's URL in
* the meantime. If the tile URL did change before the image loaded, set
* the imgDiv display to 'none', as either (a) it will be reset to visible
* when the new URL loads in the image, or (b) we don't want to display
* this tile after all because its new bounds are outside our maxExtent.
*
* This function should no longer be neccesary with the improvements to
* Grid.js in OpenLayers 2.3. The lack of a good isEquivilantURL function
* caused problems in 2.2, but it's possible that with the improved
* isEquivilant URL function, this might be neccesary at some point.
*
* See discussion in the thread at
* http://openlayers.org/pipermail/dev/2007-January/000205.html
*/
checkImgURL: function () {
// Sometimes our image will load after it has already been removed
// from the map, in which case this check is not needed.
if (this.layer) {
var loaded = this.layerAlphaHack ? this.imgDiv.firstChild.src : this.imgDiv.src;
if (!OpenLayers.Util.isEquivalentUrl(loaded, this.url)) {
this.hide();
}
}
},
/**
* Method: startTransition
* This method is invoked on tiles that are backBuffers for tiles in the
* grid. The grid tile is about to be cleared and a new tile source
* loaded. This is where the transition effect needs to be started
* to provide visual continuity.
*/
startTransition: function() {
// backBufferTile has to be valid and ready to use
if (!this.backBufferTile || !this.backBufferTile.imgDiv) {
return;
}
// calculate the ratio of change between the current resolution of the
// backBufferTile and the layer. If several animations happen in a
// row, then the backBufferTile will scale itself appropriately for
// each request.
var ratio = 1;
if (this.backBufferTile.resolution) {
ratio = this.backBufferTile.resolution / this.layer.getResolution();
}
// if the ratio is not the same as it was last time (i.e. we are
// zooming), then we need to adjust the backBuffer tile
if (ratio != this.lastRatio) {
if (this.layer.transitionEffect == 'resize') {
// In this case, we can just immediately resize the
// backBufferTile.
var upperLeft = new OpenLayers.LonLat(
this.backBufferTile.bounds.left,
this.backBufferTile.bounds.top
);
var size = new OpenLayers.Size(
this.backBufferTile.size.w * ratio,
this.backBufferTile.size.h * ratio
);
var px = this.layer.map.getLayerPxFromLonLat(upperLeft);
OpenLayers.Util.modifyDOMElement(this.backBufferTile.frame,
null, px, size);
var imageSize = this.backBufferTile.imageSize;
imageSize = new OpenLayers.Size(imageSize.w * ratio,
imageSize.h * ratio);
var imageOffset = this.backBufferTile.imageOffset;
if(imageOffset) {
imageOffset = new OpenLayers.Pixel(
imageOffset.x * ratio, imageOffset.y * ratio
);
}
OpenLayers.Util.modifyDOMElement(
this.backBufferTile.imgDiv, null, imageOffset, imageSize
) ;
this.backBufferTile.show();
}
} else {
// default effect is just to leave the existing tile
// until the new one loads if this is a singleTile and
// there was no change in resolution. Otherwise we
// don't bother to show the backBufferTile at all
if (this.layer.singleTile) {
this.backBufferTile.show();
} else {
this.backBufferTile.hide();
}
}
this.lastRatio = ratio;
},
/**
* Method: show
* Show the tile by showing its frame.
*/
show: function() {
this.frame.style.display = '';
// Force a reflow on gecko based browsers to actually show the element
// before continuing execution.
if (OpenLayers.Util.indexOf(this.layer.SUPPORTED_TRANSITIONS,
this.layer.transitionEffect) != -1) {
if (navigator.userAgent.toLowerCase().indexOf("gecko") != -1) {
this.frame.scrollLeft = this.frame.scrollLeft;
}
}
},
/**
* Method: hide
* Hide the tile by hiding its frame.
*/
hide: function() {
this.frame.style.display = 'none';
},
CLASS_NAME: "OpenLayers.Tile.Image"
}
);
OpenLayers.Tile.Image.useBlankTile = (
OpenLayers.Util.getBrowserName() == "safari" ||
OpenLayers.Util.getBrowserName() == "opera");
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