/* ************************************************************************

   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)
#optional(qx.ui.form.Button)

************************************************************************ */

/*!
  This singleton manage the global image path (prefix) and allowes themed icons.
*/
qx.OO.defineClass("qx.manager.object.ImageManager", qx.manager.object.ObjectManager,
function()
{
  qx.manager.object.ObjectManager.call(this);

  // Themes
  this._iconThemes = {};
  this._widgetThemes = {};

  // Contains known image sources (all of them, if loaded or not)
  // The value is a number which represents the number of image
  // instances which use this source
  this._sources = {};

  // Change event connection to AliasManager
  qx.manager.object.AliasManager.getInstance().addEventListener("change", this._onaliaschange, this);
});




/*
---------------------------------------------------------------------------
  DEFAULT SETTINGS
---------------------------------------------------------------------------
*/

qx.Settings.setDefault("iconTheme", "qx.theme.icon.CrystalSvg");
qx.Settings.setDefault("widgetTheme", "qx.theme.widget.Windows");






/*
---------------------------------------------------------------------------
  PROPERTIES
---------------------------------------------------------------------------
*/

qx.OO.addProperty({ name : "iconTheme", type : "object", instance : "qx.renderer.theme.IconTheme" });
qx.OO.addProperty({ name : "widgetTheme", type : "object", instance : "qx.renderer.theme.WidgetTheme" });






/*
---------------------------------------------------------------------------
  REGISTRATION
---------------------------------------------------------------------------
*/

qx.Proto.registerIconTheme = function(vThemeClass)
{
  this._iconThemes[vThemeClass.classname] = vThemeClass;

  if (vThemeClass.classname == this.getSetting("iconTheme")) {
    this.setIconTheme(vThemeClass.getInstance());
  }
}

qx.Proto.registerWidgetTheme = function(vThemeClass)
{
  this._widgetThemes[vThemeClass.classname] = vThemeClass;

  if (vThemeClass.classname == this.getSetting("widgetTheme")) {
    this.setWidgetTheme(vThemeClass.getInstance());
  }
}

qx.Proto.setIconThemeById = function(vId) {
  this.setIconTheme(this._iconThemes[vId].getInstance());
}

qx.Proto.setWidgetThemeById = function(vId) {
  this.setWidgetTheme(this._widgetThemes[vId].getInstance());
}







/*
---------------------------------------------------------------------------
  EVENTS
---------------------------------------------------------------------------
*/

qx.Proto._onaliaschange = function() {
  this._updateImages();
}






/*
---------------------------------------------------------------------------
  MODIFIERS
---------------------------------------------------------------------------
*/

qx.Proto._modifyIconTheme = function(propValue, propOldValue, propData)
{
  propValue ? qx.manager.object.AliasManager.getInstance().add("icon", propValue.getSetting("imageUri")) : qx.manager.object.AliasManager.getInstance().remove("icon");
  return true;
}

qx.Proto._modifyWidgetTheme = function(propValue, propOldValue, propData)
{
  propValue ? qx.manager.object.AliasManager.getInstance().add("widget", propValue.getSetting("imageUri")) : qx.manager.object.AliasManager.getInstance().remove("widget");
  return true;
}






/*
---------------------------------------------------------------------------
  PRELOAD API
---------------------------------------------------------------------------
*/

qx.Proto.getPreloadImageList = function()
{
  var vPreload = {};

  for (var vSource in this._sources)
  {
    if (this._sources[vSource]) {
      vPreload[vSource] = true;
    }
  }

  return vPreload;
}

qx.Proto.getPostPreloadImageList = function()
{
  var vPreload = {};

  for (var vSource in this._sources)
  {
    if (!this._sources[vSource]) {
      vPreload[vSource] = true;
    }
  }

  return vPreload;
}







/*
---------------------------------------------------------------------------
  INTERNAL HELPER
---------------------------------------------------------------------------
*/

qx.Proto._updateImages = function()
{
  var vAll = this.getAll();
  var vPreMgr = qx.manager.object.ImagePreloaderManager.getInstance();
  var vAliasMgr = qx.manager.object.AliasManager.getInstance();
  var vObject;

  // Recreate preloader of affected images
  for (var vHashCode in vAll)
  {
    vObject = vAll[vHashCode];
    vObject.setPreloader(vPreMgr.create(vAliasMgr.resolvePath(vObject.getSource(), true)));
  }

  return true;
}







/*
---------------------------------------------------------------------------
  UTILITY
---------------------------------------------------------------------------
*/

// TODO: rename to createIconThemeList
qx.Proto.createThemeList = function(vParent, xCor, yCor)
{
  var vButton;
  var vThemes = this._iconThemes;
  var vIcon = "icon/16/icons.png";
  var vPrefix = "Icon Theme: ";
  var vEvent = "execute";

  for (var vId in vThemes)
  {
    var vObj = vThemes[vId].getInstance();
    var vButton = new qx.ui.form.Button(vPrefix + vObj.getTitle(), vIcon);

    vButton.setLocation(xCor, yCor);
    vButton.addEventListener(vEvent, new Function("qx.manager.object.ImageManager.getInstance().setIconThemeById('" + vId + "')"));

    vParent.add(vButton);

    yCor += 30;
  }
}

qx.Proto.preload = function(vPath) {
  qx.manager.object.ImagePreloaderManager.getInstance().create(qx.manager.object.AliasManager.getInstance().resolvePath(vPath));
}








/*
---------------------------------------------------------------------------
  DISPOSER
---------------------------------------------------------------------------
*/

qx.Proto.dispose = function()
{
  if (this.getDisposed()) {
    return;
  }

  // Change event connection to AliasManager
  qx.manager.object.AliasManager.getInstance().removeEventListener("change", this._onaliaschange, this);

  // Delete counter field
  this._sources = null;

  // Themes
  this._iconThemes = null;
  this._widgetThemes = null;

  return qx.manager.object.ObjectManager.prototype.dispose.call(this);
}









/*
---------------------------------------------------------------------------
  DEFER SINGLETON INSTANCE
---------------------------------------------------------------------------
*/

/**
 * Singleton Instance Getter
 */
qx.Class.getInstance = qx.util.Return.returnInstance;