diff options
Diffstat (limited to 'webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/io/image/PreloaderSystem.js')
-rwxr-xr-x | webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/io/image/PreloaderSystem.js | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/io/image/PreloaderSystem.js b/webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/io/image/PreloaderSystem.js new file mode 100755 index 0000000000..ef1356dc52 --- /dev/null +++ b/webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/io/image/PreloaderSystem.js @@ -0,0 +1,187 @@ +/* ************************************************************************ + + 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) + +************************************************************************ */ + +/** + * @event completed {qx.event.type.Event} + */ +qx.OO.defineClass("qx.io.image.PreloaderSystem", qx.core.Target, +function(vPreloadList, vCallBack, vCallBackScope) +{ + qx.core.Target.call(this); + + this._list = vPreloadList; + + // Create timer + this._timer = new qx.client.Timer(this.getSetting("timeout")); + this._timer.addEventListener("interval", this._oninterval, this); + + // If we use the compact syntax, automatically add an event listeners and start the loading process + if (vCallBack) + { + this.addEventListener("completed", vCallBack, vCallBackScope || null); + this.start(); + } +}); + +qx.Proto._stopped = false; + + + +/* +--------------------------------------------------------------------------- + DEFAULT SETTINGS +--------------------------------------------------------------------------- +*/ + +qx.Settings.setDefault("timeout", 3000); + + + + + +/* +--------------------------------------------------------------------------- + USER ACCESS +--------------------------------------------------------------------------- +*/ + +qx.Proto.start = function() +{ + if (qx.lang.Object.isEmpty(this._list)) + { + this.createDispatchEvent("completed"); + return; + } + + for (var vSource in this._list) + { + var vPreloader = qx.manager.object.ImagePreloaderManager.getInstance().create(qx.manager.object.AliasManager.getInstance().resolvePath(vSource)); + + if (vPreloader.isErroneous() || vPreloader.isLoaded()) + { + delete this._list[vSource]; + } + else + { + vPreloader._origSource = vSource; + + vPreloader.addEventListener("load", this._onload, this); + vPreloader.addEventListener("error", this._onerror, this); + } + } + + // Initial check + this._check(); +} + + + + + +/* +--------------------------------------------------------------------------- + EVENT LISTENERS +--------------------------------------------------------------------------- +*/ + +qx.Proto._onload = function(e) +{ + delete this._list[e.getTarget()._origSource]; + this._check(); +} + +qx.Proto._onerror = function(e) +{ + delete this._list[e.getTarget()._origSource]; + this._check(); +} + +qx.Proto._oninterval = function(e) +{ + this.error("Could not preload: " + qx.lang.Object.getKeysAsString(this._list)); + + this._stopped = true; + this._timer.stop(); + + this.createDispatchEvent("completed"); +} + + + + + + +/* +--------------------------------------------------------------------------- + CHECK +--------------------------------------------------------------------------- +*/ + +qx.Proto._check = function() +{ + if (this._stopped) { + return; + } + + // this.debug("Check: " + qx.lang.Object.getKeysAsString(this._list)); + + if (qx.lang.Object.isEmpty(this._list)) + { + this._timer.stop(); + this.createDispatchEvent("completed"); + } + else + { + // Restart timer for timeout + this._timer.restart(); + } +} + + + + + + +/* +--------------------------------------------------------------------------- + DISPOSER +--------------------------------------------------------------------------- +*/ + +qx.Proto.dispose = function() +{ + if (this.getDisposed()) { + return true; + } + + this._list = null; + + if (this._timer) + { + this._timer.dispose(); + this._timer = null; + } + + return qx.core.Target.prototype.dispose.call(this); +} |