/*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 ("License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.zimbra.com/license
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is: Zimbra AJAX Toolkit.
*
* The Initial Developer of the Original Code is Zimbra, Inc.
* Portions created by Zimbra are Copyright (C) 2005 Zimbra, Inc.
* All Rights Reserved.
*
* Contributor(s):
*
* ***** END LICENSE BLOCK *****
*/


function DwtSash(parent, style, className, threshold, posStyle) {

	className = className ? className : "DwtSash";
	posStyle = posStyle ? posStyle : DwtControl.ABSOLUTE_STYLE;
	DwtControl.call(this, parent, className, posStyle);

    var htmlElement = this.getHtmlElement();
	if (style == null || style != DwtSash.HORIZONTAL_STYLE) {
		this._style = DwtSash.VERTICAL_STYLE;
		htmlElement.style.cursor = AjxEnv.isIE ? "row-resize" : "n-resize";
		htmlElement.innerHTML = DwtBorder.getBorderHtml("h_sash");
	} else {
		this._style = DwtSash.HORIZONTAL_STYLE;
		htmlElement.style.cursor = AjxEnv.isIE ? "col-resize" : "e-resize";
	}
	this._threshold = (threshold > 0) ? threshold : 1;

	this._captureObj = new DwtMouseEventCapture(this, "DwtSash", DwtSash._mouseOverHdlr,
			DwtSash._mouseDownHdlr, DwtSash._mouseMoveHdlr, 
			DwtSash._mouseUpHdlr, DwtSash._mouseOutHdlr);
	this.setHandler(DwtEvent.ONMOUSEDOWN, DwtSash._mouseDownHdlr);
	this.setHandler(DwtEvent.ONMOUSEOVER, DwtSash._mouseOverHdlr);
	this.setHandler(DwtEvent.ONMOUSEOUT, DwtSash._mouseOutHdlr);

	this.setZIndex(Dwt.Z_VIEW);
}

DwtSash.prototype = new DwtControl;
DwtSash.prototype.constructor = DwtSash;

DwtSash.prototype.toString = 
function() {
	return "DwtSash";
}

DwtSash.HORIZONTAL_STYLE  = 1;
DwtSash.VERTICAL_STYLE = 2;

// The callback function will be called with a proposed delta. It should return a value indication
// how much of a delta was actually applied.
DwtSash.prototype.registerCallback =
function(callbackFunc, callbackObj) {
	this._callbackFunc = callbackFunc;
	this._callbackObj = callbackObj;
}

DwtSash._mouseOverHdlr =
function(ev) {
	var mouseEv = DwtShell.mouseEvent;
	mouseEv.setFromDhtmlEvent(ev);
	mouseEv._stopPropagation = true;
	mouseEv._returnValue = false;
	mouseEv.setToDhtmlEvent(ev);
	return false;	
}

DwtSash._mouseDownHdlr =
function(ev) {
	var mouseEv = DwtShell.mouseEvent;
	mouseEv.setFromDhtmlEvent(ev);	
	if (mouseEv.button != DwtMouseEvent.LEFT) {
		DwtUiEvent.setBehaviour(ev, true, false);
		return false;
	}
	var sash = mouseEv.dwtObj;
	if (sash._callbackFunc != null) {
		sash._captureObj.capture();
		sash._startCoord = (sash._style == DwtSash.HORIZONTAL_STYLE) 
				? mouseEv.docX : mouseEv.docY;
	}
	mouseEv._stopPropagation = true;
	mouseEv._returnValue = false;
	mouseEv.setToDhtmlEvent(ev);
	return false;	
}

DwtSash._mouseMoveHdlr =
function(ev) {
	var mouseEv = DwtShell.mouseEvent;
	mouseEv.setFromDhtmlEvent(ev);	
	var delta = 0;
	var sash = DwtMouseEventCapture.getTargetObj();
	if (sash._style == DwtSash.HORIZONTAL_STYLE) {
		if (mouseEv.docX > 0 && mouseEv.docX != sash._startCoord)
			delta = mouseEv.docX - sash._startCoord;
	} else  {
		if (mouseEv.docY > 0 && mouseEv.docY != sash._startCoord)
			delta = mouseEv.docY - sash._startCoord;
	}
		
	if (Math.abs(delta) >= sash._threshold) {
		if (sash._callbackObj != null)
			delta = sash._callbackFunc.call(sash._callbackObj, delta);
		else 
			delta = sash._callbackFunc(delta);		
		sash._startCoord += delta;
		// If movement happened, then shift our location by the actual amount of movement
		if (delta != 0 && sash._posStyle == Dwt.ABSOLUTE_STYLE) {
			if (sash._style == DwtSash.HORIZONTAL_STYLE)
				sash.setLocation(sash.getLocation().x + delta, Dwt.DEFAULT);
			else
				sash.setLocation(Dwt.DEFAULT, sash.getLocation().y + delta);
		}
	}
		
	mouseEv._stopPropagation = true;
	mouseEv._returnValue = false;
	mouseEv.setToDhtmlEvent(ev);
	return false;	
}

DwtSash._mouseUpHdlr =
function(ev) {
	var mouseEv = DwtShell.mouseEvent;
	mouseEv.setFromDhtmlEvent(ev);	
	if (mouseEv.button != DwtMouseEvent.LEFT) {
		DwtUiEvent.setBehaviour(ev, true, false);
		return false;
	}
	
	if (DwtMouseEventCapture.getTargetObj()._callbackFunc != null)
		DwtMouseEventCapture.getCaptureObj().release();
		
	mouseEv._stopPropagation = true;
	mouseEv._returnValue = false;
	mouseEv.setToDhtmlEvent(ev);
	return false;	
}

DwtSash._mouseOutHdlr =
function(ev) {
	var mouseEv = DwtShell.mouseEvent;
	mouseEv.setFromDhtmlEvent(ev);
	mouseEv._stopPropagation = true;
	mouseEv._returnValue = false;
	mouseEv.setToDhtmlEvent(ev);
	return false;	
}