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/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2004-2006 by 1&1 Internet AG, Germany, http://www.1and1.org
License:
LGPL 2.1: http://www.gnu.org/licenses/lgpl.html
Authors:
* Sebastian Werner (wpbasti)
* Andreas Ecker (ecker)
************************************************************************ */
/* ************************************************************************
#module(ui_core)
************************************************************************ */
/**
* This is the preloader used from qx.ui.basic.Image instances.
*
* @event load {qx.event.type.Event}
* @event error {qx.event.type.Event}
*/
qx.OO.defineClass("qx.io.image.Preloader", qx.core.Target,
function(vSource)
{
if(qx.manager.object.ImagePreloaderManager.getInstance().has(vSource))
{
this.debug("Reuse qx.io.image.Preloader in old-style!");
this.debug("Please use qx.manager.object.ImagePreloaderManager.getInstance().create(source) instead!");
return qx.manager.object.ImagePreloaderManager.getInstance().get(vSource);
}
qx.core.Target.call(this);
// Create Image-Node
// Does not work with document.createElement("img") in Webkit. Interesting.
// Compare this to the bug in qx.ui.basic.Image.
this._element = new Image;
// This is needed for wrapping event to the object
this._element.qx_ImagePreloader = this;
// Define handler if image events occurs
if (qx.sys.Client.getInstance().isWebkit())
{
// Webkit as of version 41xxx
// does not get the target right. We need to help out a bit
// ugly closure!
var self = this;
this._element.onload = function(e) {
return self._onload(e);
};
this._element.onerror = function(e) {
return self._onerror(e);
};
}
else
{
this._element.onload = qx.io.image.Preloader.__onload;
this._element.onerror = qx.io.image.Preloader.__onerror;
}
// Set Source
this._source = vSource;
this._element.src = vSource;
// Set PNG State
if (qx.sys.Client.getInstance().isMshtml()) {
this._isPng = /\.png$/i.test(this._element.nameProp);
}
qx.manager.object.ImagePreloaderManager.getInstance().add(this);
});
/*
---------------------------------------------------------------------------
STATE MANAGERS
---------------------------------------------------------------------------
*/
qx.Proto._source = null;
qx.Proto._isLoaded = false;
qx.Proto._isErroneous = false;
/*
---------------------------------------------------------------------------
CROSSBROWSER GETTERS
---------------------------------------------------------------------------
*/
qx.Proto.getUri = function() { return this._source; };
qx.Proto.getSource = function() { return this._source; };
qx.Proto.isLoaded = function() { return this._isLoaded; };
qx.Proto.isErroneous = function() { return this._isErroneous; };
// only used in mshtml: true when the image format is in png
qx.Proto._isPng = false;
qx.Proto.getIsPng = function() { return this._isPng; };
if(qx.sys.Client.getInstance().isGecko())
{
qx.Proto.getWidth = function() { return this._element.naturalWidth; };
qx.Proto.getHeight = function() { return this._element.naturalHeight; };
}
else
{
qx.Proto.getWidth = function() { return this._element.width; };
qx.Proto.getHeight = function() { return this._element.height; };
}
/*
---------------------------------------------------------------------------
EVENT MAPPING
---------------------------------------------------------------------------
*/
qx.io.image.Preloader.__onload = function(e) { this.qx_ImagePreloader._onload(); };
qx.io.image.Preloader.__onerror = function(e) { this.qx_ImagePreloader._onerror(); };
qx.Proto._onload = function()
{
if (this._isLoaded || this._isErroneous) {
return;
}
this._isLoaded = true;
this._isErroneous = false;
if (this.hasEventListeners("load")) {
this.dispatchEvent(new qx.event.type.Event("load"), true);
}
}
qx.Proto._onerror = function()
{
if (this._isLoaded || this._isErroneous) {
return;
}
this.debug("Could not load: " + this._source);
this._isLoaded = false;
this._isErroneous = true;
if (this.hasEventListeners("error")) {
this.dispatchEvent(new qx.event.type.Event("error"), true);
}
}
/*
---------------------------------------------------------------------------
DISPOSER
---------------------------------------------------------------------------
*/
qx.Proto.dispose = function()
{
if(this.getDisposed()) {
return;
}
if (this._element)
{
this._element.onload = this._element.onerror = null;
this._element.qx_ImagePreloader = null;
this._element = null;
}
this._isLoaded = this._isErroneous = this._isPng = false;
return qx.core.Target.prototype.dispose.call(this);
}
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