/*
*	lib:			js-dfc-hbar
*	
*	description:	horizontal bar for DFC controls (DFCButton)
*
*	created:		Feb. 24, 2003
*	
*	contributed:	Wolfgang Schramm
*
*	methods:		add
				create

	events:		onChange
				onBeforeChange
*/

DFCHBar = function() {
	
	DFCEvent.call(this);
	
	this._aControl			= new Array();
	
	this._hSelectedCtrl		= null;			// currently selected control

	this._sEvent_onChange		= 'onChange';
	this._sEvent_onBeforeChange	= 'onBeforeChange';
	this._registerEvent(this._sEvent_onChange);
	this._registerEvent(this._sEvent_onBeforeChange);
}

DFCHBar.prototype = new DFCEvent();


DFCHBar.prototype.add = function(dfcControl) {

	// dfcControl		DFC control which must implement
	//				methods:	create, select
	//				events:	onCommand
	
	this._aControl[this._aControl.length]	= dfcControl;
}

DFCHBar.prototype.create = function(hWin, opt_domParent) {

	this._hWin			= hWin;
	this._hDoc			= hWin.document;
	this._domParent		= opt_domParent || hWin.document.body;	// DOM parent element for the button

	var domDoc	= this._hDoc;
	var domCont, domTB, domTR, domTD;
	var domCtrl;
	
	// a table container keeps all controls in one line
	domCont = domDoc.createElement('table');
	domCont.setAttribute('border', '0', 0);
	domCont.setAttribute('cellpadding', '0', 0);
	domCont.setAttribute('cellspacing', '0', 0);

		domTB = domDoc.createElement('tbody');
			domTR = domDoc.createElement('tr');
			
				// loop: all dfc controls
				for (var iControl = 0; iControl < this._aControl.length; iControl++) {
				
					dfcCtrl = this._aControl[iControl];
					
					domTD = domDoc.createElement('td');
	
						dfcCtrl.create(this._hWin, domTD);
						
						// add eventlistener if it's a DFCEvent control
						if (dfcCtrl.DFCEvent) {
							dfcCtrl.addEventListener('onBeforeCommand',	this._onBeforeCommand, this);
							dfcCtrl.addEventListener('onCommand',		this._onCommand, this);
						}
						
					domTR.appendChild(domTD);
				}
				
			domTB.appendChild(domTR);	
		domCont.appendChild(domTB);
	this._domParent.appendChild(domCont);
}


DFCHBar.prototype._onBeforeCommand = function(dfcControl) {

	// callback when an onBeforeCommand event occures in a dfc control
	
	this._raiseEvent(this._sEvent_onBeforeChange, dfcControl);
}


DFCHBar.prototype._onCommand = function(dfcControl) {

	// callback when an onCommand event occures in a dfc control
	
	// nothing happens if current control is the already selected one
	if (dfcControl == this._hSelectedCtrl) { return; }
	
	// deselect last selected control
	if (this._hSelectedCtrl) {
		this._hSelectedCtrl.select(false);
	}

	// set current control
	this._hSelectedCtrl = dfcControl;
	
	this._raiseEvent(this._sEvent_onChange, dfcControl);
}