/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.

This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").

Doom 3 Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Doom 3 Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#include "../../idlib/precompiled.h"
#pragma hdrstop

#include "GEApp.h"
#include "GEZOrderModifier.h"


rvGEZOrderModifier::rvGEZOrderModifier ( const char* name, idWindow* window, EZOrderChange change ) :
	rvGEModifier ( name, window )
{
	int			count;
	int			index;
	idWindow*	parent;

	parent = window->GetParent ( );
	if ( !parent )
	{
		return;
	}

	count = parent->GetChildCount ( );
	index = parent->GetChildIndex ( mWindow );

	if ( index + 1 >= count )
	{
		mUndoBefore = NULL;
	}
	else
	{
		mUndoBefore = parent->GetChild ( index + 1 );
	}

	switch ( change )
	{
		case ZO_FORWARD:
			index+=2;
			break;

		case ZO_BACKWARD:
			if ( index == 0 )
			{
				index = 1;
			}
			else
			{
				index-=1;
			}
			break;

		case ZO_BACK:
			index = 0;
			break;

		case ZO_FRONT:
			index = count;
			break;
	}

	if ( index >= count )
	{
		mBefore = NULL;
	}
	else
	{
		mBefore = parent->GetChild ( index );
	}
}

bool rvGEZOrderModifier::Apply ( void )
{
	idWindow* parent;

	parent = mWindow->GetParent ( );

	parent->RemoveChild ( mWindow );
	parent->InsertChild ( mWindow, mBefore );

	return true;
}

bool rvGEZOrderModifier::Undo ( void )
{
	idWindow* parent;

	parent = mWindow->GetParent ( );

	parent->RemoveChild ( mWindow );
	parent->InsertChild ( mWindow, mUndoBefore );

	return true;
}

bool rvGEZOrderModifier::IsValid ( void )
{
	if ( !mWindow->GetParent ( ) )
	{
		return false;
	}

	return true;
}