rendwnd.cpp

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// $Id: rendwnd.cpp 1593 2006-07-29 11:22:30Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

This file is part of Xara LX.

Xara LX is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License version 2 as published
by the Free Software Foundation.

Xara LX and its component source files are 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 Xara LX (see the file GPL in the root directory of the
distribution); if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA  02110-1301 USA


ADDITIONAL RIGHTS
-----------------

Conditional upon your continuing compliance with the GNU General Public
License described above, Xara Group Ltd grants to you certain additional
rights. 

The additional rights are to use, modify, and distribute the software
together with the wxWidgets library, the wxXtra library, and the "CDraw"
library and any other such library that any version of Xara LX relased
by Xara Group Ltd requires in order to compile and execute, including
the static linking of that library to XaraLX. In the case of the
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License to provide source code by providing a binary copy of the library
concerned and a copy of the license accompanying it.

Nothing in this section restricts any of the rights you have under
the GNU General Public License.


SCOPE OF LICENSE
----------------

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files only, and does not necessarily apply to other Xara products which may
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----------------------------------------------

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-----

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designs are registered or unregistered trademarks, design-marks, and/or
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      Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK.
                        http://www.xara.com/

=================================XARAHEADEREND============================
 */
//
// The CRendWnd class implementation.
//


#include "camtypes.h"
#include "rendwnd.h"
#include "camelot.h"                            // for IsWin32s()
//#include "ensure.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "palman.h"
#include "ccdc.h"
#include "prncamvw.h"
//#include "docview.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "camview.h"
#include "camframe.h"
#include "keypress.h"

DECLARE_SOURCE("$Revision: 1593 $");

#if 0
#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif
#endif

CC_IMPLEMENT_DYNCREATE(OpToggleDoubleBuffer, Operation)

IMPLEMENT_DYNAMIC_CLASS( CRenderWnd, wxWindow )

// Declare smart memory handling in Debug builds
#define new CAM_DEBUG_NEW

BEGIN_EVENT_TABLE( CRenderWnd, wxWindow )
    EVT_PAINT(              CRenderWnd::OnPaint )           
    EVT_ERASE_BACKGROUND(   CRenderWnd::OnErase )
    EVT_LEFT_DOWN(          CRenderWnd::OnLButtonDown )
    EVT_LEFT_DCLICK(        CRenderWnd::OnLButtonDblClk )
    EVT_LEFT_UP(            CRenderWnd::OnLButtonUp )
    EVT_MIDDLE_DOWN(        CRenderWnd::OnMButtonDown )
    EVT_MIDDLE_DCLICK(      CRenderWnd::OnMButtonDblClk )
    EVT_MIDDLE_UP(          CRenderWnd::OnMButtonUp )
    EVT_RIGHT_DOWN(         CRenderWnd::OnRButtonDown )
    EVT_RIGHT_DCLICK(       CRenderWnd::OnRButtonDblClk )
    EVT_RIGHT_UP(           CRenderWnd::OnRButtonUp )
    EVT_MOTION(             CRenderWnd::OnMouseMove )
    EVT_MOUSEWHEEL(         CRenderWnd::OnMouseWheel )
    EVT_SIZE(               CRenderWnd::OnSize)
    EVT_SET_CURSOR(         CRenderWnd::OnSetCursor )
    EVT_KEY_DOWN(           CRenderWnd::OnKey)
    EVT_KEY_UP(             CRenderWnd::OnKey)
    EVT_CHAR(               CRenderWnd::OnChar)
    EVT_IDLE(               CRenderWnd::OnIdle)
    
#if defined(__WXGTK__)
    EVT_ENTER_WINDOW(       CRenderWnd::OnEnter )
    EVT_LEAVE_WINDOW(       CRenderWnd::OnLeave )
#endif
END_EVENT_TABLE()

BOOL CRenderWnd::m_DoubleBuffer = FALSE;

CRenderWnd::CRenderWnd(CCamView* pView) :
    m_pView(pView), m_pCCClientDC(NULL)
{
    m_DCUsers=0;
    // Nothing else to do for now...
}

CRenderWnd::~CRenderWnd()
{
    TRACEUSER("Gerry", _T("Deleting CRenderWnd at 0x%08x\n"), this);
    if (m_DCUsers)
    {
        ERROR3("CRenderWnd::~CRenderWnd non-zero DC user count - leaking a DC");
    }
    else
    {
        if (m_pCCClientDC)
        {
            delete(m_pCCClientDC);
            m_pCCClientDC = NULL;
        }
    }
}

/*********************************************************************************************
>   virtual void CRenderWnd::AllocateDC(BOOL KeepIt=TRUE)

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    12/06/2006
    Inputs:     None
    Outputs:    None
    Returns:    Pointer to the CCClientDC
    Purpose:    Returns a pointer to the appropriate client DC, allocating it if necessary
    Errors:     -
    Scope:      Public
    SeeAlso:    CCamView::OnCreate()

**********************************************************************************************/ 

void CRenderWnd::AllocateDC(BOOL KeepIt/*=TRUE*/)
{
    ERROR3IF((m_DCUsers && !m_pCCClientDC), "We have users, but no client DC");
    if (!m_pCCClientDC)
        m_pCCClientDC = new CCClientDC(this); // OK if it fails
    
    if (KeepIt)
        m_DCUsers++;
    return;
}

/*********************************************************************************************
>   virtual wxClientDC * CRenderWnd::GetClientDC()

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    12/06/2006
    Inputs:     None
    Outputs:    None
    Returns:    Pointer to the CCClientDC
    Purpose:    Returns a pointer to the appropriate client DC, allocating it if necessary
    Errors:     -
    Scope:      Public
    SeeAlso:    CCamView::OnCreate()

**********************************************************************************************/ 

wxClientDC * CRenderWnd::GetClientDC()
{
    if (!m_pCCClientDC)
        AllocateDC(FALSE);
    return (wxClientDC*)(m_pCCClientDC?m_pCCClientDC->GetDC():NULL);
}

/*********************************************************************************************
>   void CRenderWnd::DoneWithDC()

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    12/06/2006
    Purpose:    Hints that we've done with our DC
    SeeAlso:    View; PaperRenderRegion.

Note this is merely a hint. This routine is not guaranteed to eb called

**********************************************************************************************/ 

void CRenderWnd::DoneWithDC()
{
    ERROR3IF((m_DCUsers<=0), "We have no users, but I'm being told I'm done with");

    if (m_DCUsers>0)
        m_DCUsers--;

    // Note we use a lazy-destroy from our idle handler
}

/*********************************************************************************************
>   void CRenderWnd::OnIdle()

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    12/06/2006
    Purpose:    Laze deletion of our client DC on idle
    SeeAlso:    View; PaperRenderRegion.

We appear to need to create and delete DCs or rendering into the first RenderWindow doesn't
work. Who knows why.

**********************************************************************************************/ 

void CRenderWnd::OnIdle(wxIdleEvent &event)
{
    if (PrintMonitor::IsPrintingNow())
        return;

    if ((m_DCUsers<=0) && m_pCCClientDC)
    {
        delete m_pCCClientDC;
        m_pCCClientDC=NULL;
    }
}

/*********************************************************************************************
>   virtual BOOL CRenderWnd::Create(const wxRect& rect,
                                    wxWindow* parent, UINT32 id)
    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Windows instance-style flags; a
                rectangle describing the position of the scroller; a pointer to its
                parent window; a child window numeric identifier
    Outputs:    -
    Returns:    TRUE if the window is successfully created.
    Purpose:    Registers a new window class with the operating system, which accepts
                double clicks, is byte-aligned in video RAM and is responsible for
                drawing is own backgrounds.
    Errors:     -
    Scope:      Public
    SeeAlso:    CCamView::OnCreate()

**********************************************************************************************/ 
BOOL CRenderWnd::Create(const wxRect& rect,
                        wxWindow *pParent, UINT32 id)
{
    BOOL ok=wxWindow::Create(pParent, id, rect.GetTopLeft(), rect.GetSize(), wxNO_FULL_REPAINT_ON_RESIZE);
    SetExtraStyle(wxWS_EX_PROCESS_IDLE);
#if defined(__WXGTK__)
	::SetDoubleBuffer(this, m_DoubleBuffer);
#endif
    return ok;
}



// CRenderWnd message handlers.

/*********************************************************************************************
>   afx_msg void CRenderWnd::OnPaint()

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Creates a CPaintDC and sends a private WM_RENDERVIEW message, together with
                a pointer to the CPaintDC in the LPARAM, to the parent CCamView. Uses a
                CCPaintDC so we can get to the rectangle list subsequently.
    Errors:     -
    Scope:      Protected
    SeeAlso:    CCamView::OnRenderView()

**********************************************************************************************/ 
void CRenderWnd::OnPaint( wxPaintEvent &evnt )
{
    if ((!CCamApp::IsDisabled()) && (!PrintMonitor::IsPrintingNow()))
    {
        CCPaintDC dc(this);
//      wxPalette* OldPal = PaletteManager::StartPaintPalette(&dc);

        if (m_pView)
            m_pView->OnDraw(dc.GetDC());

//      PaletteManager::StopPaintPalette(&dc, OldPal);
    }
    else
    {
        // if we were printing, we have to draw something - white will do
        if (PrintMonitor::IsPrintingNow())
        {
            // Draw a white rectangle here
            wxPaintDC MyPaint(this);

            // Lets have a white brush...
            MyPaint.SetBrush(wxBrush(wxColour(*wxWHITE)));
            MyPaint.SetPen(*wxTRANSPARENT_PEN);

            wxRegionIterator upd(GetUpdateRegion()); // get the update rect list

            while (upd)
            {
                wxRect rect(upd.GetRect());
                MyPaint.DrawRectangle(rect);
                upd++;
            }

            // ask for a full redraw at the end
            PrintMonitor::WantFullRedraw(TRUE);
        }
        else
        {
            wxPaintDC dc( this );                               // Clear paint condition 
        }
    }
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnLButtonDown(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnLButtonDown()

**********************************************************************************************/ 
void CRenderWnd::OnLButtonDown( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnLButtonDown(evnt);
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnLButtonDblClk(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnLButtonDblClk()

**********************************************************************************************/ 
void CRenderWnd::OnLButtonDblClk( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnLButtonDblClk(evnt);
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnLButtonUp(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnLButtonUp()

**********************************************************************************************/ 
void CRenderWnd::OnLButtonUp( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnLButtonUp(evnt);
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnMouseMove(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnMouseMove()

**********************************************************************************************/ 
void CRenderWnd::OnMouseMove( wxMouseEvent &event )
{
    if (m_pView)
        m_pView->OnMouseMove( event );
    
#if defined(__WXGTK__)
    wxSetCursorEvent    CursorEvent( event.m_x, event.m_y );
    OnSetCursor( CursorEvent );
    if( CursorEvent.HasCursor() )
    {
        // The window cursor seems to be ignored, but is needed for
        // CaptureMouse to work
        wxSetCursor( CursorEvent.GetCursor() );
        SetCursor( CursorEvent.GetCursor() );
    }
#endif
}

/*********************************************************************************************
>   void CRenderWnd::OnKey( wxKeyEvent & event )

    Author:     Alex Bligh (alex@alex.org.uk)
    Created:    2 May 2006
    Inputs:     reference to the event
    Outputs:    -
    Returns:    -
    Purpose:    This DOES NOT ACTUALLY HANDLE EVENTS, it only notes a key has been 
                pressed and stops the mouse motion mangler eating the next mouse move.
    Errors:     -
    Scope:      Protected
    SeeAlso:    -

**********************************************************************************************/ 

void CRenderWnd::OnKey( wxKeyEvent & event )
{
    if (m_pView)
        m_pView->DontSkipNextMouse();
    
    event.Skip(); // Pass the key event on to someone who really wants it.
}

void CRenderWnd::OnChar( wxKeyEvent & event )
{
    TRACEUSER( "jlh92", _T("CRenderWnd::OnChar \"%c\" \n"), event.GetUnicodeKey() );

    if( !AfxGetApp().HandleKeyPress( event ) )
        event.Skip(); // Pass the key event on to someone who really wants it.
}

/*********************************************************************************************
>   afx_msg void CRenderWnd::OnRButtonDown(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnRButtonDown()

**********************************************************************************************/ 
void CRenderWnd::OnRButtonDown( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnRButtonDown(evnt);
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnRButtonDblClk(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnRButtonDblClk()

**********************************************************************************************/ 
void CRenderWnd::OnRButtonDblClk( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnRButtonDblClk(evnt);
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnRButtonUp(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnRButtonUp()

**********************************************************************************************/ 
void CRenderWnd::OnRButtonUp( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnRButtonUp(evnt);
}


/*********************************************************************************************
>   afx_msg void CRenderWnd::OnMButtonDown(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnLButtonDown()

**********************************************************************************************/ 
void CRenderWnd::OnMButtonDown( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnMButtonDown(evnt);
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnMButtonDblClk(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnLButtonDblClk()

**********************************************************************************************/ 
void CRenderWnd::OnMButtonDblClk( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnMButtonDblClk(evnt);
}



/*********************************************************************************************
>   afx_msg void CRenderWnd::OnMButtonUp(UINT32, CPoint)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    ages ago
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView via a call to
                CRenderWnd::PassMsgToParent().
    Errors:     -
    Scope:      Protected
    SeeAlso:    CRenderWnd::PassMsgToParent(); CCamView::OnLButtonUp()

**********************************************************************************************/ 
void CRenderWnd::OnMButtonUp( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnMButtonUp(evnt);
}


/*********************************************************************************************
>   void CRenderWnd::OnMouseWheel(wxMouseEvent &event)

    Author:     Gerry_Iles (Xara Group Ltd) <camelotdev@xara.com>
    Created:    03/02/2006
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Passes the mouse message on to the parent CCamView
    Errors:     -
    Scope:      Protected
    SeeAlso:    -

**********************************************************************************************/ 

void CRenderWnd::OnMouseWheel( wxMouseEvent &evnt )
{
    if (m_pView)
        m_pView->OnMouseWheel(evnt);
}


/*********************************************************************************************
>   void CRenderWnd::OnSize( wxSizeEvent &evnt )

    Author:     Gerry_Iles (Xara Group Ltd) <camelotdev@xara.com>
    Created:    03/02/2006
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Does nothing, skipping the event
    Errors:     -
    Scope:      Protected
    SeeAlso:    -

**********************************************************************************************/ 

void CRenderWnd::OnSize( wxSizeEvent &evnt )
{
    TRACEUSER("Gerry", _T("CRenderWnd::OnSize(%d, %d)\n"), evnt.m_size.x, evnt.m_size.y);
    evnt.Skip();
}



/*********************************************************************************************
>   void CRenderWnd::OnErase( wxEraseEvent &evnt )

    Author:     Gerry_Iles (Xara Group Ltd) <camelotdev@xara.com>
    Created:    03/02/2006
    Inputs:     Not used.
    Outputs:    -
    Returns:    -
    Purpose:    Does nothing
    Errors:     -
    Scope:      Protected
    SeeAlso:    -

**********************************************************************************************/ 
void CRenderWnd::OnErase( wxEraseEvent &evnt )
{
    // Do nothing
}

/*********************************************************************************************
>   void CCamView::OnSetCursor(wxSetCursorEvent& event)

    Author:     Luke_Hart (Xara Group Ltd) <camelotdev@xara.com>
    Created:    08/02/06
    Inputs:     The event.
    Outputs:    -
    Returns:    -
    Purpose:    Eat the cursor update requests to stop anyone else playing with them, this is 
                needed on MSW or the cursor reverts to the normal arrow.
    Errors:     -
    Scope:      Protected
    SeeAlso:    

**********************************************************************************************/ 

void CRenderWnd::OnSetCursor( wxSetCursorEvent& event )
{
    if( NULL != m_pView )
        m_pView->OnSetCursor( event );
}

#if defined(__WXGTK__)
void CRenderWnd::OnEnter( wxMouseEvent &event )
{
    TRACEUSER( "Luke", _T("OnEnter %p\n"), event.GetEventObject() );
    
//  if( event.GetEventObject() != m_pFrame )
//      return;
    
    wxPoint             pt( event.GetPosition() );
    wxSetCursorEvent    CursorEvent( pt.x, pt.y );
    m_pView->OnSetCursor( CursorEvent );
    if( CursorEvent.HasCursor() )
    {
        wxSetCursor( CursorEvent.GetCursor() );
    }
}

void CRenderWnd::OnLeave( wxMouseEvent &event )
{
    TRACEUSER( "Luke", _T("OnLeave %p\n"), event.GetEventObject() );

//  if( event.GetEventObject() != m_pFrame )
//      return;
    
    ::wxSetCursor( *wxSTANDARD_CURSOR );
}
#endif

void CRenderWnd::SetDoubleBuffer(BOOL DoubleBuffer)
{
    m_DoubleBuffer = DoubleBuffer;
    // Now go through and set or clear double buffering on each window
    wxWindow * pWindow = CCamFrame::GetMainFrame();
    if (pWindow) ReflectDoubleBufferingInChildren(pWindow);
}

void CRenderWnd::ReflectDoubleBufferingInChildren(wxWindow * pWindow)
{
#if defined(__WXGTK__)
    // Process this one
    if (pWindow->IsKindOf(CLASSINFO(CRenderWnd)))
		::SetDoubleBuffer(pWindow, m_DoubleBuffer);
#endif

    // Now process children if any
    wxWindowList::Node * pNode = pWindow->GetChildren().GetFirst();
    while (pNode)
    {
        ReflectDoubleBufferingInChildren(pNode->GetData());
        pNode = pNode->GetNext();
    }
    return;
}

/********************************************************************************************

>   OpToggleDoubleBuffer::OpToggleDoubleBuffer() : Operation()

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    14 Mar 2006
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Constructs an OpToggleDoubleBuffer object.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

OpToggleDoubleBuffer::OpToggleDoubleBuffer() : Operation()
{

}



/********************************************************************************************

>   OpToggleDoubleBuffer::~OpToggleDoubleBuffer()

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    14 Mar 2006
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Destructs an OpToggleDoubleBuffer object.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

OpToggleDoubleBuffer::~OpToggleDoubleBuffer()
{
    // Empty
}



/********************************************************************************************

>   void OpToggleDoubleBuffer::Do(OpDescriptor*)

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    14 Mar 2006
    Inputs:     Pointer to Operation Descriptor
    Outputs:    -
    Returns:    -
    Purpose:    Actually "DO" a ToggleFore operation.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

void OpToggleDoubleBuffer::Do(OpDescriptor*)
{
    CRenderWnd::SetDoubleBuffer(!CRenderWnd::GetDoubleBuffer());
    End();
}



/********************************************************************************************

>   OpState OpToggleDoubleBuffer::GetState(String_256* UIDescription, OpDescriptor*)

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    14 Mar 2006
    Inputs:     Pointer to Operation Descriptor
                Text Description
    Outputs:    -
    Returns:    -
    Purpose:    Find the state of the OpToggleDoubleBuffer operation.
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

OpState OpToggleDoubleBuffer::GetState(String_256* UIDescription, OpDescriptor*)
{
    // Default to !ticked and greyed
    OpState blobby(FALSE, TRUE);
    blobby.Ticked = CRenderWnd::GetDoubleBuffer();
    blobby.Greyed = FALSE;
    return(blobby);
}



/********************************************************************************************

>   BOOL OpToggleDoubleBuffer::Init()

    Author:     Alex Bligh <alex@alex.org.uk>
    Created:    14 Mar 2006
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Create an OpDescriptor for the OpToggleDoubleBuffer operation
    Errors:     -
    SeeAlso:    -

********************************************************************************************/

BOOL OpToggleDoubleBuffer::Init()   
{
    return Operation::RegisterOpDescriptor( 
                                            0, 
                                            _R(IDS_TOGGLE_DOUBLEBUFFER),
                                            CC_RUNTIME_CLASS(OpToggleDoubleBuffer), 
                                            OPTOKEN_TOGGLEDOUBLEBUFFER,
                                            OpToggleDoubleBuffer::GetState,
                                            0,                      // help ID
                                            0,// _R(IDBBL_FOREBACKGRNDOP),
                                            0,                      // bitmap ID
                                            0,                      // control ID
                                            SYSTEMBAR_ILLEGAL,      // group bar ID
                                            TRUE,
                                            FALSE,
                                            TRUE,
                                            NULL,
                                            0,
                                            0,
                                            TRUE
                                           );
}

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