1/*
2 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
3 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
4 *
5 * == BEGIN LICENSE ==
6 *
7 * Licensed under the terms of any of the following licenses at your
8 * choice:
9 *
10 *  - GNU General Public License Version 2 or later (the "GPL")
11 *    http://www.gnu.org/licenses/gpl.html
12 *
13 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
14 *    http://www.gnu.org/licenses/lgpl.html
15 *
16 *  - Mozilla Public License Version 1.1 or later (the "MPL")
17 *    http://www.mozilla.org/MPL/MPL-1.1.html
18 *
19 * == END LICENSE ==
20 *
21 * Plugin: automatically resizes the editor until a configurable maximun
22 * height (FCKConfig.AutoGrowMax), based on its contents.
23 */
24
25var FCKAutoGrow = {
26	MIN_HEIGHT : window.frameElement.offsetHeight,
27
28	Check : function()
29	{
30		var delta = FCKAutoGrow.GetHeightDelta() ;
31		if ( delta != 0 )
32		{
33			var newHeight = window.frameElement.offsetHeight + delta ;
34
35			newHeight = FCKAutoGrow.GetEffectiveHeight( newHeight ) ;
36
37			if ( newHeight != window.frameElement.height )
38			{
39				window.frameElement.style.height = newHeight + "px" ;
40
41				// Gecko browsers use an onresize handler to update the innermost
42				// IFRAME's height. If the document is modified before the onresize
43				// is triggered, the plugin will miscalculate the new height. Thus,
44				// forcibly trigger onresize. #1336
45				if ( typeof window.onresize == 'function' )
46				{
47					window.onresize() ;
48				}
49			}
50		}
51	},
52
53	CheckEditorStatus : function( sender, status )
54	{
55		if ( status == FCK_STATUS_COMPLETE )
56			FCKAutoGrow.Check() ;
57	},
58
59	GetEffectiveHeight : function( height )
60	{
61		if ( height < FCKAutoGrow.MIN_HEIGHT )
62			height = FCKAutoGrow.MIN_HEIGHT;
63		else
64		{
65			var max = FCKConfig.AutoGrowMax;
66			if ( max && max > 0 && height > max )
67				height = max;
68		}
69
70		return height;
71	},
72
73	GetHeightDelta : function()
74	{
75		var oInnerDoc = FCK.EditorDocument ;
76
77		var iFrameHeight ;
78		var iInnerHeight ;
79
80		if ( FCKBrowserInfo.IsIE )
81		{
82			iFrameHeight = FCK.EditorWindow.frameElement.offsetHeight ;
83			iInnerHeight = oInnerDoc.body.scrollHeight ;
84		}
85		else
86		{
87			iFrameHeight = FCK.EditorWindow.innerHeight ;
88			iInnerHeight = oInnerDoc.body.offsetHeight +
89				( parseInt( FCKDomTools.GetCurrentElementStyle( oInnerDoc.body, 'margin-top' ), 10 ) || 0 ) +
90				( parseInt( FCKDomTools.GetCurrentElementStyle( oInnerDoc.body, 'margin-bottom' ), 10 ) || 0 ) ;
91		}
92
93		return iInnerHeight - iFrameHeight ;
94	},
95
96	SetListeners : function()
97	{
98		if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
99			return ;
100
101		FCK.EditorWindow.attachEvent( 'onscroll', FCKAutoGrow.Check ) ;
102		FCK.EditorDocument.attachEvent( 'onkeyup', FCKAutoGrow.Check ) ;
103	}
104};
105
106FCK.AttachToOnSelectionChange( FCKAutoGrow.Check ) ;
107
108if ( FCKBrowserInfo.IsIE )
109	FCK.Events.AttachEvent( 'OnAfterSetHTML', FCKAutoGrow.SetListeners ) ;
110
111FCK.Events.AttachEvent( 'OnStatusChange', FCKAutoGrow.CheckEditorStatus ) ;
112