(function () {
/**
* OverlayManager is used for maintaining the focus status of
* multiple Overlays.
* @namespace YAHOO.widget
* @namespace YAHOO.widget
* @class OverlayManager
* @constructor
* @param {Array} overlays Optional. A collection of Overlays to register
* with the manager.
* @param {Object} userConfig The object literal representing the user
* configuration of the OverlayManager
*/
YAHOO.widget.OverlayManager = function (userConfig) {
this.init(userConfig);
};
var Overlay = YAHOO.widget.Overlay,
Event = YAHOO.util.Event,
Dom = YAHOO.util.Dom,
Config = YAHOO.util.Config,
CustomEvent = YAHOO.util.CustomEvent,
OverlayManager = YAHOO.widget.OverlayManager;
/**
* The CSS class representing a focused Overlay
* @property OverlayManager.CSS_FOCUSED
* @static
* @final
* @type String
*/
OverlayManager.CSS_FOCUSED = "focused";
OverlayManager.prototype = {
/**
* The class's constructor function
* @property contructor
* @type Function
*/
constructor: OverlayManager,
/**
* The array of Overlays that are currently registered
* @property overlays
* @type YAHOO.widget.Overlay[]
*/
overlays: null,
/**
* Initializes the default configuration of the OverlayManager
* @method initDefaultConfig
*/
initDefaultConfig: function () {
/**
* The collection of registered Overlays in use by
* the OverlayManager
* @config overlays
* @type YAHOO.widget.Overlay[]
* @default null
*/
this.cfg.addProperty("overlays", { suppressEvent: true } );
/**
* The default DOM event that should be used to focus an Overlay
* @config focusevent
* @type String
* @default "mousedown"
*/
this.cfg.addProperty("focusevent", { value: "mousedown" } );
},
/**
* Initializes the OverlayManager
* @method init
* @param {Overlay[]} overlays Optional. A collection of Overlays to
* register with the manager.
* @param {Object} userConfig The object literal representing the user
* configuration of the OverlayManager
*/
init: function (userConfig) {
/**
* The OverlayManager's Config object used for monitoring
* configuration properties.
* @property cfg
* @type Config
*/
this.cfg = new Config(this);
this.initDefaultConfig();
if (userConfig) {
this.cfg.applyConfig(userConfig, true);
}
this.cfg.fireQueue();
/**
* The currently activated Overlay
* @property activeOverlay
* @private
* @type YAHOO.widget.Overlay
*/
var activeOverlay = null;
/**
* Returns the currently focused Overlay
* @method getActive
* @return {Overlay} The currently focused Overlay
*/
this.getActive = function () {
return activeOverlay;
};
/**
* Focuses the specified Overlay
* @method focus
* @param {Overlay} overlay The Overlay to focus
* @param {String} overlay The id of the Overlay to focus
*/
this.focus = function (overlay) {
var o = this.find(overlay);
if (o) {
o.focus();
}
};
/**
* Removes the specified Overlay from the manager
* @method remove
* @param {Overlay} overlay The Overlay to remove
* @param {String} overlay The id of the Overlay to remove
*/
this.remove = function (overlay) {
var o = this.find(overlay),
originalZ;
if (o) {
if (activeOverlay == o) {
activeOverlay = null;
}
var bDestroyed = (o.element === null && o.cfg === null) ? true : false;
if (!bDestroyed) {
// Set it's zindex so that it's sorted to the end.
originalZ = Dom.getStyle(o.element, "zIndex");
o.cfg.setProperty("zIndex", -1000, true);
}
this.overlays.sort(this.compareZIndexDesc);
this.overlays = this.overlays.slice(0, (this.overlays.length - 1));
o.hideEvent.unsubscribe(o.blur);
o.destroyEvent.unsubscribe(this._onOverlayDestroy, o);
o.focusEvent.unsubscribe(this._onOverlayFocusHandler, o);
o.blurEvent.unsubscribe(this._onOverlayBlurHandler, o);
if (!bDestroyed) {
Event.removeListener(o.element, this.cfg.getProperty("focusevent"), this._onOverlayElementFocus);
o.cfg.setProperty("zIndex", originalZ, true);
o.cfg.setProperty("manager", null);
}
/* _managed Flag for custom or existing. Don't want to remove existing */
if (o.focusEvent._managed) { o.focusEvent = null; }
if (o.blurEvent._managed) { o.blurEvent = null; }
if (o.focus._managed) { o.focus = null; }
if (o.blur._managed) { o.blur = null; }
}
};
/**
* Removes focus from all registered Overlays in the manager
* @method blurAll
*/
this.blurAll = function () {
var nOverlays = this.overlays.length,
i;
if (nOverlays > 0) {
i = nOverlays - 1;
do {
this.overlays[i].blur();
}
while(i--);
}
};
/**
* Updates the state of the OverlayManager and overlay, as a result of the overlay
* being blurred.
*
* @method _manageBlur
* @param {Overlay} overlay The overlay instance which got blurred.
* @protected
*/
this._manageBlur = function (overlay) {
var changed = false;
if (activeOverlay == overlay) {
Dom.removeClass(activeOverlay.element, OverlayManager.CSS_FOCUSED);
activeOverlay = null;
changed = true;
}
return changed;
};
/**
* Updates the state of the OverlayManager and overlay, as a result of the overlay
* receiving focus.
*
* @method _manageFocus
* @param {Overlay} overlay The overlay instance which got focus.
* @protected
*/
this._manageFocus = function(overlay) {
var changed = false;
if (activeOverlay != overlay) {
if (activeOverlay) {
activeOverlay.blur();
}
activeOverlay = overlay;
this.bringToTop(activeOverlay);
Dom.addClass(activeOverlay.element, OverlayManager.CSS_FOCUSED);
changed = true;
}
return changed;
};
var overlays = this.cfg.getProperty("overlays");
if (! this.overlays) {
this.overlays = [];
}
if (overlays) {
this.register(overlays);
this.overlays.sort(this.compareZIndexDesc);
}
},
/**
* @method _onOverlayElementFocus
* @description Event handler for the DOM event that is used to focus
* the Overlay instance as specified by the "focusevent"
* configuration property.
* @private
* @param {Event} p_oEvent Object representing the DOM event
* object passed back by the event utility (Event).
*/
_onOverlayElementFocus: function (p_oEvent) {
var oTarget = Event.getTarget(p_oEvent),
oClose = this.close;
if (oClose && (oTarget == oClose || Dom.isAncestor(oClose, oTarget))) {
this.blur();
} else {
this.focus();
}
},
/**
* @method _onOverlayDestroy
* @description "destroy" event handler for the Overlay.
* @private
* @param {String} p_sType String representing the name of the event
* that was fired.
* @param {Array} p_aArgs Array of arguments sent when the event
* was fired.
* @param {Overlay} p_oOverlay Object representing the overlay that
* fired the event.
*/
_onOverlayDestroy: function (p_sType, p_aArgs, p_oOverlay) {
this.remove(p_oOverlay);
},
/**
* @method _onOverlayFocusHandler
*
* @description focusEvent Handler, used to delegate to _manageFocus with the correct arguments.
*
* @private
* @param {String} p_sType String representing the name of the event
* that was fired.
* @param {Array} p_aArgs Array of arguments sent when the event
* was fired.
* @param {Overlay} p_oOverlay Object representing the overlay that
* fired the event.
*/
_onOverlayFocusHandler: function(p_sType, p_aArgs, p_oOverlay) {
this._manageFocus(p_oOverlay);
},
/**
* @method _onOverlayBlurHandler
* @description blurEvent Handler, used to delegate to _manageBlur with the correct arguments.
*
* @private
* @param {String} p_sType String representing the name of the event
* that was fired.
* @param {Array} p_aArgs Array of arguments sent when the event
* was fired.
* @param {Overlay} p_oOverlay Object representing the overlay that
* fired the event.
*/
_onOverlayBlurHandler: function(p_sType, p_aArgs, p_oOverlay) {
this._manageBlur(p_oOverlay);
},
/**
* Subscribes to the Overlay based instance focusEvent, to allow the OverlayManager to
* monitor focus state.
*
* If the instance already has a focusEvent (e.g. Menu), OverlayManager will subscribe
* to the existing focusEvent, however if a focusEvent or focus method does not exist
* on the instance, the _bindFocus method will add them, and the focus method will
* update the OverlayManager's state directly.
*
* @method _bindFocus
* @param {Overlay} overlay The overlay for which focus needs to be managed
* @protected
*/
_bindFocus : function(overlay) {
var mgr = this;
if (!overlay.focusEvent) {
overlay.focusEvent = overlay.createEvent("focus");
overlay.focusEvent.signature = CustomEvent.LIST;
overlay.focusEvent._managed = true;
} else {
overlay.focusEvent.subscribe(mgr._onOverlayFocusHandler, overlay, mgr);
}
if (!overlay.focus) {
Event.on(overlay.element, mgr.cfg.getProperty("focusevent"), mgr._onOverlayElementFocus, null, overlay);
overlay.focus = function () {
if (mgr._manageFocus(this)) {
// For Panel/Dialog
if (this.cfg.getProperty("visible") && this.focusFirst) {
this.focusFirst();
}
this.focusEvent.fire();
}
};
overlay.focus._managed = true;
}
},
/**
* Subscribes to the Overlay based instance's blurEvent to allow the OverlayManager to
* monitor blur state.
*
* If the instance already has a blurEvent (e.g. Menu), OverlayManager will subscribe
* to the existing blurEvent, however if a blurEvent or blur method does not exist
* on the instance, the _bindBlur method will add them, and the blur method
* update the OverlayManager's state directly.
*
* @method _bindBlur
* @param {Overlay} overlay The overlay for which blur needs to be managed
* @protected
*/
_bindBlur : function(overlay) {
var mgr = this;
if (!overlay.blurEvent) {
overlay.blurEvent = overlay.createEvent("blur");
overlay.blurEvent.signature = CustomEvent.LIST;
overlay.focusEvent._managed = true;
} else {
overlay.blurEvent.subscribe(mgr._onOverlayBlurHandler, overlay, mgr);
}
if (!overlay.blur) {
overlay.blur = function () {
if (mgr._manageBlur(this)) {
this.blurEvent.fire();
}
};
overlay.blur._managed = true;
}
overlay.hideEvent.subscribe(overlay.blur);
},
/**
* Subscribes to the Overlay based instance's destroyEvent, to allow the Overlay
* to be removed for the OverlayManager when destroyed.
*
* @method _bindDestroy
* @param {Overlay} overlay The overlay instance being managed
* @protected
*/
_bindDestroy : function(overlay) {
var mgr = this;
overlay.destroyEvent.subscribe(mgr._onOverlayDestroy, overlay, mgr);
},
/**
* Ensures the zIndex configuration property on the managed overlay based instance
* is set to the computed zIndex value from the DOM (with "auto" translating to 0).
*
* @method _syncZIndex
* @param {Overlay} overlay The overlay instance being managed
* @protected
*/
_syncZIndex : function(overlay) {
var zIndex = Dom.getStyle(overlay.element, "zIndex");
if (!isNaN(zIndex)) {
overlay.cfg.setProperty("zIndex", parseInt(zIndex, 10));
} else {
overlay.cfg.setProperty("zIndex", 0);
}
},
/**
* Registers an Overlay or an array of Overlays with the manager. Upon
* registration, the Overlay receives functions for focus and blur,
* along with CustomEvents for each.
*
* @method register
* @param {Overlay} overlay An Overlay to register with the manager.
* @param {Overlay[]} overlay An array of Overlays to register with
* the manager.
* @return {boolean} true if any Overlays are registered.
*/
register: function (overlay) {
var registered = false,
i,
n;
if (overlay instanceof Overlay) {
overlay.cfg.addProperty("manager", { value: this } );
this._bindFocus(overlay);
this._bindBlur(overlay);
this._bindDestroy(overlay);
this._syncZIndex(overlay);
this.overlays.push(overlay);
this.bringToTop(overlay);
registered = true;
} else if (overlay instanceof Array) {
for (i = 0, n = overlay.length; i < n; i++) {
registered = this.register(overlay[i]) || registered;
}
}
return registered;
},
/**
* Places the specified Overlay instance on top of all other
* Overlay instances.
* @method bringToTop
* @param {YAHOO.widget.Overlay} p_oOverlay Object representing an
* Overlay instance.
* @param {String} p_oOverlay String representing the id of an
* Overlay instance.
*/
bringToTop: function (p_oOverlay) {
var oOverlay = this.find(p_oOverlay),
nTopZIndex,
oTopOverlay,
aOverlays;
if (oOverlay) {
aOverlays = this.overlays;
aOverlays.sort(this.compareZIndexDesc);
oTopOverlay = aOverlays[0];
if (oTopOverlay) {
nTopZIndex = Dom.getStyle(oTopOverlay.element, "zIndex");
if (!isNaN(nTopZIndex)) {
var bRequiresBump = false;
if (oTopOverlay !== oOverlay) {
bRequiresBump = true;
} else if (aOverlays.length > 1) {
var nNextZIndex = Dom.getStyle(aOverlays[1].element, "zIndex");
// Don't rely on DOM order to stack if 2 overlays are at the same zindex.
if (!isNaN(nNextZIndex) && (nTopZIndex == nNextZIndex)) {
bRequiresBump = true;
}
}
if (bRequiresBump) {
oOverlay.cfg.setProperty("zindex", (parseInt(nTopZIndex, 10) + 2));
}
}
aOverlays.sort(this.compareZIndexDesc);
}
}
},
/**
* Attempts to locate an Overlay by instance or ID.
* @method find
* @param {Overlay} overlay An Overlay to locate within the manager
* @param {String} overlay An Overlay id to locate within the manager
* @return {Overlay} The requested Overlay, if found, or null if it
* cannot be located.
*/
find: function (overlay) {
var isInstance = overlay instanceof Overlay,
overlays = this.overlays,
n = overlays.length,
found = null,
o,
i;
if (isInstance || typeof overlay == "string") {
for (i = n-1; i >= 0; i--) {
o = overlays[i];
if ((isInstance && (o === overlay)) || (o.id == overlay)) {
found = o;
break;
}
}
}
return found;
},
/**
* Used for sorting the manager's Overlays by z-index.
* @method compareZIndexDesc
* @private
* @return {Number} 0, 1, or -1, depending on where the Overlay should
* fall in the stacking order.
*/
compareZIndexDesc: function (o1, o2) {
var zIndex1 = (o1.cfg) ? o1.cfg.getProperty("zIndex") : null, // Sort invalid (destroyed)
zIndex2 = (o2.cfg) ? o2.cfg.getProperty("zIndex") : null; // objects at bottom.
if (zIndex1 === null && zIndex2 === null) {
return 0;
} else if (zIndex1 === null){
return 1;
} else if (zIndex2 === null) {
return -1;
} else if (zIndex1 > zIndex2) {
return -1;
} else if (zIndex1 < zIndex2) {
return 1;
} else {
return 0;
}
},
/**
* Shows all Overlays in the manager.
* @method showAll
*/
showAll: function () {
var overlays = this.overlays,
n = overlays.length,
i;
for (i = n - 1; i >= 0; i--) {
overlays[i].show();
}
},
/**
* Hides all Overlays in the manager.
* @method hideAll
*/
hideAll: function () {
var overlays = this.overlays,
n = overlays.length,
i;
for (i = n - 1; i >= 0; i--) {
overlays[i].hide();
}
},
/**
* Returns a string representation of the object.
* @method toString
* @return {String} The string representation of the OverlayManager
*/
toString: function () {
return "OverlayManager";
}
};
}());