/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_svtools.hxx"
#include <svtools/wizardmachine.hxx>
#include <svtools/helpid.hrc>
#include <tools/debug.hxx>
#include <tools/diagnose_ex.h>
#include <vcl/msgbox.hxx>
#include <svtools/svtdata.hxx>
#ifndef _SVTOOLS_HRC
#include <svtools/svtools.hrc>
#endif

//.........................................................................
namespace svt
{
//.........................................................................

	//=====================================================================
	//= WizardPageImplData
	//=====================================================================
	struct WizardPageImplData
	{
		WizardPageImplData()
		{
		}
	};

	//=====================================================================
	//= OWizardPage
	//=====================================================================
	//---------------------------------------------------------------------
    OWizardPage::OWizardPage( Window* _pParent, WinBits _nStyle )
		:TabPage( _pParent, _nStyle )
		,m_pImpl( new WizardPageImplData )
	{
	}

	//---------------------------------------------------------------------
    OWizardPage::OWizardPage( Window* _pParent, const ResId& _rResId )
		:TabPage( _pParent, _rResId )
		,m_pImpl( new WizardPageImplData )
	{
	}

	//---------------------------------------------------------------------
	OWizardPage::~OWizardPage()
	{
		delete m_pImpl;
	}

	//---------------------------------------------------------------------
	void OWizardPage::initializePage()
	{
	}

	//---------------------------------------------------------------------
	void OWizardPage::ActivatePage()
	{
		TabPage::ActivatePage();
        updateDialogTravelUI();
	}

    //---------------------------------------------------------------------
    void OWizardPage::updateDialogTravelUI()
    {
        OWizardMachine* pWizardMachine = dynamic_cast< OWizardMachine* >( GetParent() );
        if ( pWizardMachine )
            pWizardMachine->updateTravelUI();
    }

	//---------------------------------------------------------------------
	bool OWizardPage::canAdvance() const
	{
        return true;
	}

	//---------------------------------------------------------------------
	sal_Bool OWizardPage::commitPage( WizardTypes::CommitPageReason )
	{
		return sal_True;
	}

	//=====================================================================
	//= WizardMachineImplData
	//=====================================================================
    struct WizardMachineImplData : public WizardTypes
	{
        String                          sTitleBase;         // the base for the title
        ::std::stack< WizardState >     aStateHistory;      // the history of all states (used for implementing "Back")

        WizardState                     nFirstUnknownPage;
            // the WizardDialog does not allow non-linear transitions (e.g. it's
            // not possible to add pages in a non-linear order), so we need some own maintenance data

		sal_Bool						m_bAutoNextButtonState;

        bool                            m_bTravelingSuspended;

        WizardMachineImplData()
            :nFirstUnknownPage( 0 )
            ,m_bAutoNextButtonState( sal_False )
            ,m_bTravelingSuspended( false )
        {
        }
	};

    long OWizardMachine::calcRightHelpOffset(sal_uInt32 _nButtonFlags)
    {
        sal_Int32 nMask = 1;
        sal_Int32 nRightAlignedButtonCount = -1;
        for (unsigned int i = 0; i < 8*sizeof(_nButtonFlags); i++ )
        {
            if( ( _nButtonFlags & nMask ) != 0 )
                nRightAlignedButtonCount++;
            nMask <<= 1;
        }
        Size aSize = GetPageSizePixel();
        sal_Int32 nTotButtonWidth = nRightAlignedButtonCount * LogicalCoordinateToPixel(50);
        sal_Int32 nTotRightButtonSpaceOffset = (nRightAlignedButtonCount) * WIZARDDIALOG_BUTTON_STDOFFSET_X;
        if ((_nButtonFlags & WZB_NEXT) && (_nButtonFlags & WZB_NEXT))
            nTotRightButtonSpaceOffset = (nTotRightButtonSpaceOffset - WIZARDDIALOG_BUTTON_STDOFFSET_X) + WIZARDDIALOG_BUTTON_SMALLSTDOFFSET_X;
        return aSize.Width() - nTotButtonWidth - nTotRightButtonSpaceOffset;
    }

	//=====================================================================
	//= OWizardMachine
	//=====================================================================
	//---------------------------------------------------------------------
	OWizardMachine::OWizardMachine(Window* _pParent, const ResId& _rRes, sal_uInt32 _nButtonFlags )
		:WizardDialog( _pParent, _rRes )
		,m_pFinish(NULL)
		,m_pCancel(NULL)
		,m_pNextPage(NULL)
		,m_pPrevPage(NULL)
		,m_pHelp(NULL)
		,m_pImpl( new WizardMachineImplData )
	{
        implConstruct( _nButtonFlags );
	}

	//---------------------------------------------------------------------
    OWizardMachine::OWizardMachine(Window* _pParent, const WinBits i_nStyle, sal_uInt32 _nButtonFlags )
		:WizardDialog( _pParent, i_nStyle )
		,m_pFinish(NULL)
		,m_pCancel(NULL)
		,m_pNextPage(NULL)
		,m_pPrevPage(NULL)
		,m_pHelp(NULL)
		,m_pImpl( new WizardMachineImplData )
    {
        implConstruct( _nButtonFlags );
    }

	//---------------------------------------------------------------------
    void OWizardMachine::implConstruct( const sal_uInt32 _nButtonFlags )
    {
		m_pImpl->sTitleBase = GetText();

		// create the buttons according to the wizard button flags
		// the help button
		if (_nButtonFlags & WZB_HELP)
		{
			m_pHelp= new HelpButton(this, WB_TABSTOP);
			m_pHelp->SetSizePixel( LogicToPixel( Size( 50, 14 ), MAP_APPFONT ) );
			m_pHelp->Show();
			AddButton( m_pHelp, WIZARDDIALOG_BUTTON_STDOFFSET_X);
		}

		// the previous button
		if (_nButtonFlags & WZB_PREVIOUS)
		{
			m_pPrevPage = new PushButton(this, WB_TABSTOP);
            m_pPrevPage->SetHelpId( HID_WIZARD_PREVIOUS );
			m_pPrevPage->SetSizePixel( LogicToPixel( Size( 50, 14 ), MAP_APPFONT ) );
			m_pPrevPage->SetText(String(SvtResId(STR_WIZDLG_PREVIOUS)));
			m_pPrevPage->Show();

			if (_nButtonFlags & WZB_NEXT)
				AddButton( m_pPrevPage, ( WIZARDDIALOG_BUTTON_SMALLSTDOFFSET_X) );		// half x-offset to the next button
			else
				AddButton( m_pPrevPage, WIZARDDIALOG_BUTTON_STDOFFSET_X );
			SetPrevButton( m_pPrevPage );
			m_pPrevPage->SetClickHdl( LINK( this, OWizardMachine, OnPrevPage ) );
		}

		// the next button
		if (_nButtonFlags & WZB_NEXT)
		{
			m_pNextPage = new PushButton(this, WB_TABSTOP);
            m_pNextPage->SetHelpId( HID_WIZARD_NEXT );
			m_pNextPage->SetSizePixel( LogicToPixel( Size( 50, 14 ), MAP_APPFONT ) );
			m_pNextPage->SetText(String(SvtResId(STR_WIZDLG_NEXT)));
			m_pNextPage->Show();

			AddButton( m_pNextPage, WIZARDDIALOG_BUTTON_STDOFFSET_X );
			SetNextButton( m_pNextPage );
			m_pNextPage->SetClickHdl( LINK( this, OWizardMachine, OnNextPage ) );
		}

		// the finish button
		if (_nButtonFlags & WZB_FINISH)
		{
			m_pFinish = new OKButton(this, WB_TABSTOP);
			m_pFinish->SetSizePixel( LogicToPixel( Size( 50, 14 ), MAP_APPFONT ) );
			m_pFinish->SetText(String(SvtResId(STR_WIZDLG_FINISH)));
			m_pFinish->Show();

			AddButton( m_pFinish, WIZARDDIALOG_BUTTON_STDOFFSET_X );
			m_pFinish->SetClickHdl( LINK( this, OWizardMachine, OnFinish ) );
		}

        // the cancel button
		if (_nButtonFlags & WZB_CANCEL)
		{
			m_pCancel = new CancelButton(this, WB_TABSTOP);
			m_pCancel->SetSizePixel( LogicToPixel( Size( 50, 14 ), MAP_APPFONT ) );
			m_pCancel->Show();

			AddButton( m_pCancel, WIZARDDIALOG_BUTTON_STDOFFSET_X );
		}
    }

    //---------------------------------------------------------------------
	OWizardMachine::~OWizardMachine()
	{
		delete m_pFinish;
		delete m_pCancel;
		delete m_pNextPage;
		delete m_pPrevPage;
		delete m_pHelp;

		for (WizardState i=0; i<m_pImpl->nFirstUnknownPage; ++i)
			delete GetPage(i);

		delete m_pImpl;
	}

	//---------------------------------------------------------------------
	void OWizardMachine::implUpdateTitle()
	{
		String sCompleteTitle(m_pImpl->sTitleBase);

        // append the page title
		TabPage* pCurrentPage = GetPage(getCurrentState());
		if ( pCurrentPage && pCurrentPage->GetText().Len() )
		{
			sCompleteTitle += String::CreateFromAscii(" - ");
			sCompleteTitle += pCurrentPage->GetText();
		}

        SetText(sCompleteTitle);
	}

	//---------------------------------------------------------------------
	const String& OWizardMachine::getTitleBase() const
	{
		return m_pImpl->sTitleBase;
	}

	//---------------------------------------------------------------------
	void OWizardMachine::setTitleBase(const String& _rTitleBase)
	{
		m_pImpl->sTitleBase = _rTitleBase;
		implUpdateTitle();
	}

	//---------------------------------------------------------------------
    TabPage* OWizardMachine::GetOrCreatePage( const WizardState i_nState )
    {
		if ( NULL == GetPage( i_nState ) )
		{
			TabPage* pNewPage = createPage( i_nState );
			DBG_ASSERT( pNewPage, "OWizardMachine::GetOrCreatePage: invalid new page (NULL)!" );

			// fill up the page sequence of our base class (with dummies)
			while ( m_pImpl->nFirstUnknownPage < i_nState )
			{
				AddPage( NULL );
				++m_pImpl->nFirstUnknownPage;
			}

			if ( m_pImpl->nFirstUnknownPage == i_nState )
			{
				// encountered this page number the first time
				AddPage( pNewPage );
				++m_pImpl->nFirstUnknownPage;
			}
			else
				// already had this page - just change it
				SetPage( i_nState, pNewPage );
		}
        return GetPage( i_nState );
    }

	//---------------------------------------------------------------------
	void OWizardMachine::ActivatePage()
	{
		WizardDialog::ActivatePage();

		WizardState nCurrentLevel = GetCurLevel();
        GetOrCreatePage( nCurrentLevel );

		enterState( nCurrentLevel );
	}

	//---------------------------------------------------------------------
	long OWizardMachine::DeactivatePage()
	{
		WizardState nCurrentState = getCurrentState();
		if (!leaveState(nCurrentState) || !WizardDialog::DeactivatePage())
			return sal_False;
		return sal_True;
	}

	//---------------------------------------------------------------------
	void OWizardMachine::defaultButton(sal_uInt32 _nWizardButtonFlags)
	{
		// the new default button
		PushButton* pNewDefButton = NULL;
		if (m_pFinish && (_nWizardButtonFlags & WZB_FINISH))
			pNewDefButton = m_pFinish;
		if (m_pNextPage && (_nWizardButtonFlags & WZB_NEXT))
			pNewDefButton = m_pNextPage;
		if (m_pPrevPage && (_nWizardButtonFlags & WZB_PREVIOUS))
			pNewDefButton = m_pPrevPage;
		if (m_pHelp && (_nWizardButtonFlags & WZB_HELP))
			pNewDefButton = m_pHelp;
		if (m_pCancel && (_nWizardButtonFlags & WZB_CANCEL))
			pNewDefButton = m_pCancel;

		if ( pNewDefButton )
			defaultButton( pNewDefButton );
        else
            implResetDefault( this );
	}

	//---------------------------------------------------------------------
	void OWizardMachine::implResetDefault(Window* _pWindow)
	{
		Window* pChildLoop = _pWindow->GetWindow(WINDOW_FIRSTCHILD);
		while (pChildLoop)
		{
			// does the window participate in the tabbing order?
			if (pChildLoop->GetStyle() & WB_DIALOGCONTROL)
				implResetDefault(pChildLoop);

			// is it a button?
			WindowType eType = pChildLoop->GetType();
			if	(	(WINDOW_BUTTON == eType)
				||	(WINDOW_PUSHBUTTON == eType)
				||	(WINDOW_OKBUTTON == eType)
				||	(WINDOW_CANCELBUTTON == eType)
				||	(WINDOW_HELPBUTTON == eType)
				||	(WINDOW_IMAGEBUTTON == eType)
				||	(WINDOW_MENUBUTTON == eType)
				||	(WINDOW_MOREBUTTON == eType)
				)
			{
				pChildLoop->SetStyle(pChildLoop->GetStyle() & ~WB_DEFBUTTON);
			}

			// the next one ...
			pChildLoop = pChildLoop->GetWindow(WINDOW_NEXT);
		}
	}

	//---------------------------------------------------------------------
	void OWizardMachine::defaultButton(PushButton* _pNewDefButton)
	{
		// loop through all (direct and indirect) descendants which participate in our tabbing order, and
		// reset the WB_DEFBUTTON for every window which is a button
		implResetDefault(this);

		// set it's new style
		if (_pNewDefButton)
			_pNewDefButton->SetStyle(_pNewDefButton->GetStyle() | WB_DEFBUTTON);
	}

	//---------------------------------------------------------------------
	void OWizardMachine::enableButtons(sal_uInt32 _nWizardButtonFlags, sal_Bool _bEnable)
	{
		if (m_pFinish && (_nWizardButtonFlags & WZB_FINISH))
			m_pFinish->Enable(_bEnable);
		if (m_pNextPage && (_nWizardButtonFlags & WZB_NEXT))
			m_pNextPage->Enable(_bEnable);
		if (m_pPrevPage && (_nWizardButtonFlags & WZB_PREVIOUS))
			m_pPrevPage->Enable(_bEnable);
		if (m_pHelp && (_nWizardButtonFlags & WZB_HELP))
			m_pHelp->Enable(_bEnable);
		if (m_pCancel && (_nWizardButtonFlags & WZB_CANCEL))
			m_pCancel->Enable(_bEnable);
	}

	//---------------------------------------------------------------------
	void OWizardMachine::enterState(WizardState _nState)
	{
		// tell the page
		IWizardPageController* pController = getPageController( GetPage( _nState ) );
        OSL_ENSURE( pController, "OWizardMachine::enterState: no controller for the given page!" );
		if ( pController )
			pController->initializePage();

		if ( isAutomaticNextButtonStateEnabled() )
			enableButtons( WZB_NEXT, canAdvance() );

		enableButtons( WZB_PREVIOUS, !m_pImpl->aStateHistory.empty() );

		// set the new title - it depends on the current page (i.e. state)
		implUpdateTitle();
	}

	//---------------------------------------------------------------------
	sal_Bool OWizardMachine::leaveState(WizardState)
	{
		// no need to ask the page here.
		// If we reach this point, we already gave the current page the chance to commit it's data,
		// and it was allowed to commit it's data

		return sal_True;
	}

	//---------------------------------------------------------------------
	sal_Bool OWizardMachine::onFinish()
	{
		return Finnish( RET_OK );
	}

	//---------------------------------------------------------------------
	IMPL_LINK(OWizardMachine, OnFinish, PushButton*, EMPTYARG)
	{
		if ( isTravelingSuspended() )
            return 0;
        WizardTravelSuspension aTravelGuard( *this );
        if ( !prepareLeaveCurrentState( eFinish ) )
        {
			return 0L;
        }
        return onFinish() ? 1L : 0L;
	}

	//---------------------------------------------------------------------
	OWizardMachine::WizardState OWizardMachine::determineNextState( WizardState _nCurrentState ) const
	{
		return _nCurrentState + 1;
	}

	//---------------------------------------------------------------------
    sal_Bool OWizardMachine::prepareLeaveCurrentState( CommitPageReason _eReason )
	{
		IWizardPageController* pController = getPageController( GetPage( getCurrentState() ) );
        ENSURE_OR_RETURN( pController != NULL, "OWizardMachine::prepareLeaveCurrentState: no controller for the current page!", sal_True );
        return pController->commitPage( _eReason );
	}

	//---------------------------------------------------------------------
	sal_Bool OWizardMachine::skipBackwardUntil( WizardState _nTargetState )
    {
		// allowed to leave the current page?
		if ( !prepareLeaveCurrentState( eTravelBackward ) )
			return sal_False;

        // don't travel directly on m_pImpl->aStateHistory, in case something goes wrong
        ::std::stack< WizardState > aTravelVirtually = m_pImpl->aStateHistory;
		::std::stack< WizardState > aOldStateHistory = m_pImpl->aStateHistory;

        WizardState nCurrentRollbackState = getCurrentState();
        while ( nCurrentRollbackState != _nTargetState )
        {
            DBG_ASSERT( !aTravelVirtually.empty(), "OWizardMachine::skipBackwardUntil: this target state does not exist in the history!" );
		    nCurrentRollbackState = aTravelVirtually.top();
    		aTravelVirtually.pop();
        }
        m_pImpl->aStateHistory = aTravelVirtually;
		if ( !ShowPage( _nTargetState ) )
		{
	        m_pImpl->aStateHistory = aOldStateHistory;
			return sal_False;
		}
		return sal_True;
    }

	//---------------------------------------------------------------------
	sal_Bool OWizardMachine::skipUntil( WizardState _nTargetState )
    {
		WizardState nCurrentState = getCurrentState();

        // allowed to leave the current page?
        if ( !prepareLeaveCurrentState( nCurrentState < _nTargetState ? eTravelForward : eTravelBackward ) )
			return sal_False;

        // don't travel directly on m_pImpl->aStateHistory, in case something goes wrong
        ::std::stack< WizardState > aTravelVirtually = m_pImpl->aStateHistory;
		::std::stack< WizardState > aOldStateHistory = m_pImpl->aStateHistory;
        while ( nCurrentState != _nTargetState )
        {
    		WizardState nNextState = determineNextState( nCurrentState );
			if ( WZS_INVALID_STATE == nNextState )
            {
                DBG_ERROR( "OWizardMachine::skipUntil: the given target state does not exist!" );
				return sal_False;
            }

            // remember the skipped state in the history
			aTravelVirtually.push( nCurrentState );

			// get the next state
			nCurrentState = nNextState;
        }
        m_pImpl->aStateHistory = aTravelVirtually;
		// show the target page
		if ( !ShowPage( nCurrentState ) )
        {
            // argh! prepareLeaveCurrentPage succeeded, determineNextState succeeded,
            // but ShowPage doesn't? Somebody behaves very strange here ....
			DBG_ERROR( "OWizardMachine::skipUntil: very unpolite ...." );
	        m_pImpl->aStateHistory = aOldStateHistory;
			return sal_False;
        }
		return sal_True;
    }

	//---------------------------------------------------------------------
	sal_Bool OWizardMachine::skip(sal_Int32 _nSteps)
	{
		DBG_ASSERT(_nSteps > 0, "OWizardMachine::skip: invalid number of steps!");
		// allowed to leave the current page?
		if ( !prepareLeaveCurrentState( eTravelForward ) )
			return sal_False;

		WizardState nCurrentState = getCurrentState();
		WizardState nNextState = determineNextState(nCurrentState);
		// loop _nSteps steps
		while (_nSteps-- > 0)
		{
			if (WZS_INVALID_STATE == nNextState)
				return sal_False;

			// remember the skipped state in the history
			m_pImpl->aStateHistory.push(nCurrentState);

			// get the next state
			nCurrentState = nNextState;
			nNextState = determineNextState(nCurrentState);
		}

		// show the (n+1)th page
		if (!ShowPage(nCurrentState))
		{
			// TODO: this leaves us in a state where we have no current page and an inconsistent state history.
			// Perhaps we should rollback the skipping here ....
			DBG_ERROR("OWizardMachine::skip: very unpolite ....");
				// if somebody does a skip and then does not allow to leave ...
				// (can't be a commit error, as we've already committed the current page. So if ShowPage fails here,
				// somebody behaves really strange ...)
			return sal_False;
		}

		// all fine
		return sal_True;
	}

	//---------------------------------------------------------------------
	sal_Bool OWizardMachine::travelNext()
	{
		// allowed to leave the current page?
		if ( !prepareLeaveCurrentState( eTravelForward ) )
			return sal_False;

		// determine the next state to travel to
		WizardState nCurrentState = getCurrentState();
		WizardState nNextState = determineNextState(nCurrentState);
		if (WZS_INVALID_STATE == nNextState)
			return sal_False;

		// the state history is used by the enterState method
		// all fine
		m_pImpl->aStateHistory.push(nCurrentState);
		if (!ShowPage(nNextState))
		{
			m_pImpl->aStateHistory.pop();
			return sal_False;
		}

		return sal_True;
	}

	//---------------------------------------------------------------------
	sal_Bool OWizardMachine::travelPrevious()
	{
		DBG_ASSERT(m_pImpl->aStateHistory.size() > 0, "OWizardMachine::travelPrevious: have no previous page!");

		// allowed to leave the current page?
		if ( !prepareLeaveCurrentState( eTravelBackward ) )
			return sal_False;

		// the next state to switch to
		WizardState nPreviousState = m_pImpl->aStateHistory.top();

		// the state history is used by the enterState method
		m_pImpl->aStateHistory.pop();
		// show this page
		if (!ShowPage(nPreviousState))
		{
			m_pImpl->aStateHistory.push(nPreviousState);
			return sal_False;
		}

		// all fine
		return sal_True;
	}

    //---------------------------------------------------------------------
    void  OWizardMachine::removePageFromHistory( WizardState nToRemove )
    {

        ::std::stack< WizardState > aTemp;
        while(!m_pImpl->aStateHistory.empty())
        {
            WizardState nPreviousState = m_pImpl->aStateHistory.top();
            m_pImpl->aStateHistory.pop();
            if(nPreviousState != nToRemove)
                aTemp.push( nPreviousState );
            else
                break;
        }
        while(!aTemp.empty())
        {
            m_pImpl->aStateHistory.push( aTemp.top() );
            aTemp.pop();
        }
    }

	//---------------------------------------------------------------------
    void OWizardMachine::enableAutomaticNextButtonState( bool _bEnable )
    {
        m_pImpl->m_bAutoNextButtonState = _bEnable;
    }

    //---------------------------------------------------------------------
    bool OWizardMachine::isAutomaticNextButtonStateEnabled() const
    {
        return m_pImpl->m_bAutoNextButtonState;
    }

    //---------------------------------------------------------------------
	IMPL_LINK(OWizardMachine, OnPrevPage, PushButton*, EMPTYARG)
	{
		if ( isTravelingSuspended() )
            return 0;
        WizardTravelSuspension aTravelGuard( *this );
		sal_Int32 nRet = travelPrevious();
        return nRet;
	}

	//---------------------------------------------------------------------
	IMPL_LINK(OWizardMachine, OnNextPage, PushButton*, EMPTYARG)
	{
		if ( isTravelingSuspended() )
            return 0;
        WizardTravelSuspension aTravelGuard( *this );
		sal_Int32 nRet = travelNext();
        return nRet;
	}

    //---------------------------------------------------------------------
	IWizardPageController* OWizardMachine::getPageController( TabPage* _pCurrentPage ) const
	{
		IWizardPageController* pController = dynamic_cast< IWizardPageController* >( _pCurrentPage );
		return pController;
	}

    //---------------------------------------------------------------------
    void OWizardMachine::getStateHistory( ::std::vector< WizardState >& _out_rHistory )
    {
        ::std::stack< WizardState > aHistoryCopy( m_pImpl->aStateHistory );
        while ( !aHistoryCopy.empty() )
        {
            _out_rHistory.push_back( aHistoryCopy.top() );
            aHistoryCopy.pop();
        }
    }

    //---------------------------------------------------------------------
    bool OWizardMachine::canAdvance() const
    {
        return WZS_INVALID_STATE != determineNextState( getCurrentState() );
    }

    //---------------------------------------------------------------------
    void OWizardMachine::updateTravelUI()
    {
        const IWizardPageController* pController = getPageController( GetPage( getCurrentState() ) );
        OSL_ENSURE( pController != NULL, "RoadmapWizard::updateTravelUI: no controller for the current page!" );

        bool bCanAdvance =
                ( !pController || pController->canAdvance() )   // the current page allows to advance
            &&  canAdvance();                                   // the dialog as a whole allows to advance
        enableButtons( WZB_NEXT, bCanAdvance );
    }

    //---------------------------------------------------------------------
    bool OWizardMachine::isTravelingSuspended() const
    {
        return m_pImpl->m_bTravelingSuspended;
    }

	//---------------------------------------------------------------------
    void OWizardMachine::suspendTraveling( AccessGuard )
    {
        DBG_ASSERT( !m_pImpl->m_bTravelingSuspended, "OWizardMachine::suspendTraveling: already suspended!" );
       m_pImpl->m_bTravelingSuspended = true;
    }

	//---------------------------------------------------------------------
    void OWizardMachine::resumeTraveling( AccessGuard )
    {
        DBG_ASSERT( m_pImpl->m_bTravelingSuspended, "OWizardMachine::resumeTraveling: nothing to resume!" );
       m_pImpl->m_bTravelingSuspended = false;
    }

//.........................................................................
}	// namespace svt
//.........................................................................