175 lines
3.8 KiB
JavaScript
175 lines
3.8 KiB
JavaScript
goog.provide('ol.ImageTile');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('goog.events');
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goog.require('goog.events.EventType');
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goog.require('goog.object');
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goog.require('ol.Tile');
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goog.require('ol.TileCoord');
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goog.require('ol.TileLoadFunctionType');
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goog.require('ol.TileState');
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/**
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* @constructor
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* @extends {ol.Tile}
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {ol.TileState} state State.
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* @param {string} src Image source URI.
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* @param {?string} crossOrigin Cross origin.
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* @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
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*/
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ol.ImageTile = function(tileCoord, state, src, crossOrigin, tileLoadFunction) {
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goog.base(this, tileCoord, state);
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/**
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* Image URI
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*
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* @private
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* @type {string}
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*/
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this.src_ = src;
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/**
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* @private
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* @type {Image}
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*/
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this.image_ = new Image();
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if (!goog.isNull(crossOrigin)) {
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this.image_.crossOrigin = crossOrigin;
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}
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/**
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* @private
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* @type {Object.<number, Image>}
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*/
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this.imageByContext_ = {};
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/**
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* @private
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* @type {Array.<goog.events.Key>}
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*/
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this.imageListenerKeys_ = null;
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/**
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* @private
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* @type {ol.TileLoadFunctionType}
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*/
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this.tileLoadFunction_ = tileLoadFunction;
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};
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goog.inherits(ol.ImageTile, ol.Tile);
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/**
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* @inheritDoc
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*/
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ol.ImageTile.prototype.disposeInternal = function() {
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if (this.state == ol.TileState.LOADING) {
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this.unlistenImage_();
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}
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goog.base(this, 'disposeInternal');
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};
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/**
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* @inheritDoc
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* @api
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*/
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ol.ImageTile.prototype.getImage = function(opt_context) {
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if (goog.isDef(opt_context)) {
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var image;
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var key = goog.getUid(opt_context);
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if (key in this.imageByContext_) {
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return this.imageByContext_[key];
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} else if (goog.object.isEmpty(this.imageByContext_)) {
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image = this.image_;
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} else {
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image = /** @type {Image} */ (this.image_.cloneNode(false));
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}
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this.imageByContext_[key] = image;
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return image;
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} else {
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return this.image_;
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}
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};
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/**
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* @inheritDoc
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*/
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ol.ImageTile.prototype.getKey = function() {
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return this.src_;
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};
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/**
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* Tracks loading or read errors.
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*
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* @private
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*/
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ol.ImageTile.prototype.handleImageError_ = function() {
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this.state = ol.TileState.ERROR;
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this.unlistenImage_();
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this.changed();
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};
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/**
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* Tracks successful image load.
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*
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* @private
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*/
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ol.ImageTile.prototype.handleImageLoad_ = function() {
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if (ol.LEGACY_IE_SUPPORT && ol.IS_LEGACY_IE) {
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if (!goog.isDef(this.image_.naturalWidth)) {
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this.image_.naturalWidth = this.image_.width;
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this.image_.naturalHeight = this.image_.height;
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}
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}
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if (this.image_.naturalWidth && this.image_.naturalHeight) {
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this.state = ol.TileState.LOADED;
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} else {
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this.state = ol.TileState.EMPTY;
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}
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this.unlistenImage_();
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this.changed();
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};
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/**
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* Load not yet loaded URI.
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*/
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ol.ImageTile.prototype.load = function() {
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if (this.state == ol.TileState.IDLE) {
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this.state = ol.TileState.LOADING;
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this.changed();
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goog.asserts.assert(goog.isNull(this.imageListenerKeys_),
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'this.imageListenerKeys_ should be null');
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this.imageListenerKeys_ = [
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goog.events.listenOnce(this.image_, goog.events.EventType.ERROR,
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this.handleImageError_, false, this),
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goog.events.listenOnce(this.image_, goog.events.EventType.LOAD,
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this.handleImageLoad_, false, this)
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];
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this.tileLoadFunction_(this, this.src_);
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}
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};
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/**
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* Discards event handlers which listen for load completion or errors.
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*
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* @private
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*/
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ol.ImageTile.prototype.unlistenImage_ = function() {
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goog.asserts.assert(!goog.isNull(this.imageListenerKeys_),
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'this.imageListenerKeys_ should not be null');
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goog.array.forEach(this.imageListenerKeys_, goog.events.unlistenByKey);
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this.imageListenerKeys_ = null;
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};
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