/////////////////////////////////////////////////////////////////////////////
-// Name: dcclient.cpp
+// Name: src/msw/dcclient.cpp
// Purpose: wxClientDC class
// Author: Julian Smart
// Modified by:
// Created: 01/02/97
// RCS-ID: $Id$
-// Copyright: (c) Julian Smart and Markus Holzem
-// Licence: wxWindows licence
+// Copyright: (c) Julian Smart
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation "dcclient.h"
-#endif
+// ===========================================================================
+// declarations
+// ===========================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
+#include "wx/dcclient.h"
+#include "wx/msw/dcclient.h"
+
#ifndef WX_PRECOMP
+ #include "wx/string.h"
+ #include "wx/log.h"
+ #include "wx/window.h"
#endif
-#include "wx/dcclient.h"
-#include "wx/log.h"
+#include "wx/msw/private.h"
+
+// ----------------------------------------------------------------------------
+// array/list types
+// ----------------------------------------------------------------------------
+
+struct WXDLLEXPORT wxPaintDCInfo
+{
+ wxPaintDCInfo(wxWindow *win, wxPaintDCImpl *dc)
+ {
+ hwnd = win->GetHWND();
+ hdc = dc->GetHDC();
+ count = 1;
+ }
+
+ WXHWND hwnd; // window for this DC
+ WXHDC hdc; // the DC handle
+ size_t count; // usage count
+};
+
+#include "wx/arrimpl.cpp"
+
+WX_DEFINE_OBJARRAY(wxArrayDCInfo)
+
+// ----------------------------------------------------------------------------
+// macros
+// ----------------------------------------------------------------------------
+
+// ----------------------------------------------------------------------------
+// global variables
+// ----------------------------------------------------------------------------
+
+static PAINTSTRUCT g_paintStruct;
+
+#ifdef __WXDEBUG__
+ // a global variable which we check to verify that wxPaintDC are only
+ // created in response to WM_PAINT message - doing this from elsewhere is a
+ // common programming error among wxWidgets programmers and might lead to
+ // very subtle and difficult to debug refresh/repaint bugs.
+ int g_isPainting = 0;
+#endif // __WXDEBUG__
+
+// ===========================================================================
+// implementation
+// ===========================================================================
+
+// ----------------------------------------------------------------------------
+// wxMSWWindowDCImpl
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxWindowDCImpl, wxMSWDCImpl)
+
+wxWindowDCImpl::wxWindowDCImpl( wxDC *owner ) :
+ wxMSWDCImpl( owner )
+{
+}
+
+wxWindowDCImpl::wxWindowDCImpl( wxDC *owner, wxWindow *window ) :
+ wxMSWDCImpl( owner )
+{
+ wxCHECK_RET( window, _T("invalid window in wxWindowDCImpl") );
-#include <windows.h>
+ m_window = window;
+ m_hDC = (WXHDC) ::GetWindowDC(GetHwndOf(m_window));
-#if !USE_SHARED_LIBRARY
-IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
-IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
-IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxWindowDC)
+ // m_bOwnsDC was already set to false in the base class ctor, so the DC
+ // will be released (and not deleted) in ~wxDC
+ InitDC();
+}
+
+void wxWindowDCImpl::InitDC()
+{
+ // the background mode is only used for text background and is set in
+ // DrawText() to OPAQUE as required, otherwise always TRANSPARENT,
+ ::SetBkMode(GetHdc(), TRANSPARENT);
+
+ // since we are a window dc we need to grab the palette from the window
+#if wxUSE_PALETTE
+ InitializePalette();
#endif
+}
-/*
- * wxWindowDC
- */
+void wxWindowDCImpl::DoGetSize(int *width, int *height) const
+{
+ wxCHECK_RET( m_window, _T("wxWindowDCImpl without a window?") );
-wxWindowDC::wxWindowDC(void)
+ m_window->GetSize(width, height);
+}
+
+// ----------------------------------------------------------------------------
+// wxClientDCImpl
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxClientDCImpl, wxWindowDCImpl)
+
+wxClientDCImpl::wxClientDCImpl( wxDC *owner ) :
+ wxWindowDCImpl( owner )
{
- m_canvas = NULL;
}
-wxWindowDC::wxWindowDC(wxWindow *the_canvas)
+wxClientDCImpl::wxClientDCImpl( wxDC *owner, wxWindow *window ) :
+ wxWindowDCImpl( owner )
{
- m_canvas = the_canvas;
-// m_hDC = (WXHDC) ::GetDCEx((HWND) the_canvas->GetHWND(), NULL, DCX_WINDOW);
- m_hDC = (WXHDC) ::GetWindowDC((HWND) the_canvas->GetHWND() );
- m_hDCCount ++;
+ wxCHECK_RET( window, _T("invalid window in wxClientDCImpl") );
+
+ m_window = window;
+ m_hDC = (WXHDC)::GetDC(GetHwndOf(window));
+
+ // m_bOwnsDC was already set to false in the base class ctor, so the DC
+ // will be released (and not deleted) in ~wxDC
- SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
+ InitDC();
}
-wxWindowDC::~wxWindowDC(void)
+void wxClientDCImpl::InitDC()
{
- if (m_canvas && m_hDC)
- {
- SelectOldObjects(m_hDC);
+ wxWindowDCImpl::InitDC();
- ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
- m_hDC = 0;
- }
- m_hDCCount --;
+ // in wxUniv build we must manually do some DC adjustments usually
+ // performed by Windows for us
+ //
+ // we also need to take the menu/toolbar manually into account under
+ // Windows CE because they're just another control there, not anything
+ // special as usually under Windows
+#if defined(__WXUNIVERSAL__) || defined(__WXWINCE__)
+ wxPoint ptOrigin = m_window->GetClientAreaOrigin();
+ if ( ptOrigin.x || ptOrigin.y )
+ {
+ // no need to shift DC origin if shift is null
+ SetDeviceOrigin(ptOrigin.x, ptOrigin.y);
+ }
+
+ // clip the DC to avoid overwriting the non client area
+ wxSize size = m_window->GetClientSize();
+ DoSetClippingRegion(0, 0, size.x, size.y);
+#endif // __WXUNIVERSAL__ || __WXWINCE__
}
-/*
- * wxClientDC
- */
+wxClientDCImpl::~wxClientDCImpl()
+{
+}
+
+void wxClientDCImpl::DoGetSize(int *width, int *height) const
+{
+ wxCHECK_RET( m_window, _T("wxClientDCImpl without a window?") );
+
+ m_window->GetClientSize(width, height);
+}
+
+// ----------------------------------------------------------------------------
+// wxPaintDCImpl
+// ----------------------------------------------------------------------------
+
+// VZ: initial implementation (by JACS) only remembered the last wxPaintDC
+// created and tried to reuse it - this was supposed to take care of a
+// situation when a derived class OnPaint() calls base class OnPaint()
+// because in this case ::BeginPaint() shouldn't be called second time.
+//
+// I'm not sure how useful this is, however we must remember the HWND
+// associated with the last HDC as well - otherwise we may (and will!) try
+// to reuse the HDC for another HWND which is a nice recipe for disaster.
+//
+// So we store a list of windows for which we already have the DC and not
+// just one single hDC. This seems to work, but I'm really not sure about
+// the usefullness of the whole idea - IMHO it's much better to not call
+// base class OnPaint() at all, or, if we really want to allow it, add a
+// "wxPaintDC *" parameter to wxPaintEvent which should be used if it's
+// !NULL instead of creating a new DC.
+
+IMPLEMENT_ABSTRACT_CLASS(wxPaintDCImpl, wxClientDCImpl)
+
+wxArrayDCInfo wxPaintDCImpl::ms_cache;
+
+wxPaintDCImpl::wxPaintDCImpl( wxDC *owner ) :
+ wxClientDCImpl( owner )
+{
+}
-wxClientDC::wxClientDC(void)
+wxPaintDCImpl::wxPaintDCImpl( wxDC *owner, wxWindow *window ) :
+ wxClientDCImpl( owner )
{
- m_canvas = NULL;
+ wxCHECK_RET( window, wxT("NULL canvas in wxPaintDCImpl ctor") );
+
+#ifdef __WXDEBUG__
+ if ( g_isPainting <= 0 )
+ {
+ wxFAIL_MSG( wxT("wxPaintDCImpl may be created only in EVT_PAINT handler!") );
+
+ return;
+ }
+#endif // __WXDEBUG__
+
+ m_window = window;
+
+ // do we have a DC for this window in the cache?
+ wxPaintDCInfo *info = FindInCache();
+ if ( info )
+ {
+ m_hDC = info->hdc;
+ info->count++;
+ }
+ else // not in cache, create a new one
+ {
+ m_hDC = (WXHDC)::BeginPaint(GetHwndOf(m_window), &g_paintStruct);
+ if (m_hDC)
+ ms_cache.Add(new wxPaintDCInfo(m_window, this));
+ }
+
+ // Note: at this point m_hDC can be NULL under MicroWindows, when dragging.
+ if (!GetHDC())
+ return;
+
+ // (re)set the DC parameters.
+ InitDC();
+
+ // the HDC can have a clipping box (which we didn't set), make sure our
+ // DoGetClippingBox() checks for it
+ m_clipping = true;
}
-wxClientDC::wxClientDC(wxWindow *the_canvas)
+wxPaintDCImpl::~wxPaintDCImpl()
{
- m_canvas = the_canvas;
-// BeginDrawing();
- m_hDC = (WXHDC) ::GetDC((HWND) the_canvas->GetHWND());
+ if ( m_hDC )
+ {
+ SelectOldObjects(m_hDC);
- SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
+ size_t index;
+ wxPaintDCInfo *info = FindInCache(&index);
+
+ wxCHECK_RET( info, wxT("existing DC should have a cache entry") );
+
+ if ( --info->count == 0 )
+ {
+ ::EndPaint(GetHwndOf(m_window), &g_paintStruct);
+
+ ms_cache.RemoveAt(index);
+
+ // Reduce the number of bogus reports of non-freed memory
+ // at app exit
+ if (ms_cache.IsEmpty())
+ ms_cache.Clear();
+ }
+ //else: cached DC entry is still in use
+
+ // prevent the base class dtor from ReleaseDC()ing it again
+ m_hDC = 0;
+ }
}
-wxClientDC::~wxClientDC(void)
+wxPaintDCInfo *wxPaintDCImpl::FindInCache(size_t *index) const
{
-// EndDrawing();
+ wxPaintDCInfo *info = NULL;
+ size_t nCache = ms_cache.GetCount();
+ for ( size_t n = 0; n < nCache; n++ )
+ {
+ wxPaintDCInfo *info1 = &ms_cache[n];
+ if ( info1->hwnd == m_window->GetHWND() )
+ {
+ info = info1;
+ if ( index )
+ *index = n;
+ break;
+ }
+ }
- if (m_canvas && (HDC) m_hDC)
- {
- SelectOldObjects(m_hDC);
+ return info;
+}
- ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
- m_hDC = 0;
- }
+// find the entry for this DC in the cache (keyed by the window)
+WXHDC wxPaintDCImpl::FindDCInCache(wxWindow* win)
+{
+ size_t nCache = ms_cache.GetCount();
+ for ( size_t n = 0; n < nCache; n++ )
+ {
+ wxPaintDCInfo *info = &ms_cache[n];
+ if ( info->hwnd == win->GetHWND() )
+ {
+ return info->hdc;
+ }
+ }
+ return 0;
}
/*
- * wxPaintDC
+ * wxPaintDCEx
*/
-wxPaintDC::wxPaintDC(void)
+// TODO: don't duplicate wxPaintDCImpl code here!!
+
+class wxPaintDCExImpl: public wxPaintDCImpl
{
- m_canvas = NULL;
-}
+public:
+ wxPaintDCExImpl( wxDC *owner, wxWindow *window, WXHDC dc );
+ ~wxPaintDCExImpl();
+
+ int m_saveState;
+};
-static PAINTSTRUCT g_paintStruct;
-// Don't call Begin/EndPaint if it's already been called:
-// for example, if calling a base class OnPaint.
+IMPLEMENT_ABSTRACT_CLASS(wxPaintDCEx,wxPaintDC)
-WXHDC wxPaintDC::ms_PaintHDC = 0;
-size_t wxPaintDC::ms_PaintCount = 0; // count of ms_PaintHDC usage
+wxPaintDCEx::wxPaintDCEx(wxWindow *window, WXHDC dc)
+ : wxPaintDC(new wxPaintDCExImpl(this, window, dc))
+{
+}
-wxPaintDC::wxPaintDC(wxWindow *canvas)
+wxPaintDCExImpl::wxPaintDCExImpl(wxDC *owner, wxWindow *window, WXHDC dc)
+ : wxPaintDCImpl( owner )
{
- wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
+ wxCHECK_RET( dc, wxT("wxPaintDCEx requires an existing device context") );
- m_canvas = canvas;
- if ( ms_PaintCount > 0 ) {
- // it means that we've already called BeginPaint and so we must just
- // reuse the same HDC (BeginPaint shouldn't be called more than once)
- wxASSERT( ms_PaintHDC );
+ m_saveState = 0;
- m_hDC = ms_PaintHDC;
- ms_PaintCount++;
- }
- else {
- ms_PaintHDC =
- m_hDC = (WXHDC)::BeginPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
- ms_PaintCount = 1;
- m_hDCCount++;
- }
+ m_window = window;
- SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
+ wxPaintDCInfo *info = FindInCache();
+ if ( info )
+ {
+ m_hDC = info->hdc;
+ info->count++;
+ }
+ else // not in cache, create a new one
+ {
+ m_hDC = dc;
+ ms_cache.Add(new wxPaintDCInfo(m_window, this));
+ m_saveState = SaveDC((HDC) dc);
+ }
}
-wxPaintDC::~wxPaintDC()
+wxPaintDCExImpl::~wxPaintDCExImpl()
{
- if ( m_hDC ) {
- if ( !--ms_PaintCount ) {
- ::EndPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
- m_hDCCount--;
- m_hDC = (WXHDC) NULL;
- ms_PaintHDC = (WXHDC) NULL;
- }
- else { }//: ms_PaintHDC still in use
- }
+ size_t index;
+ wxPaintDCInfo *info = FindInCache(&index);
+
+ wxCHECK_RET( info, wxT("existing DC should have a cache entry") );
+
+ if ( --info->count == 0 )
+ {
+ RestoreDC((HDC) m_hDC, m_saveState);
+ ms_cache.RemoveAt(index);
+
+ // Reduce the number of bogus reports of non-freed memory
+ // at app exit
+ if (ms_cache.IsEmpty())
+ ms_cache.Clear();
+ }
+ //else: cached DC entry is still in use
+
+ // prevent the base class dtor from ReleaseDC()ing it again
+ m_hDC = 0;
}
+
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