Get the page title from the IHtmlDocument rather than the bowser as it actually retur...

[wxWidgets.git] / src / msw / dcclient.cpp

diff --git a/src/msw/dcclient.cpp b/src/msw/dcclient.cpp
index a7becdbf5cf7b670158dd69bde1aefee0a54e361..bad81c1e72762e0ba45cd3d69a797aa56573060d 100644 (file)
--- a/src/msw/dcclient.cpp
+++ b/src/msw/dcclient.cpp
@@ -1,133 +1,393 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        dcclient.cpp
+// Name:        src/msw/dcclient.cpp

 // Purpose:     wxClientDC class
 // Author:      Julian Smart
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
 // 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__
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__

-#pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #endif
 

+#include "wx/dcclient.h"
+#include "wx/msw/dcclient.h"
+

 #ifndef WX_PRECOMP
 #ifndef WX_PRECOMP

+    #include "wx/string.h"
+    #include "wx/log.h"
+    #include "wx/window.h"

 #endif
 
 #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 wxHAS_PAINT_DEBUG
+    // 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 // wxHAS_PAINT_DEBUG
+
+// ===========================================================================
+// implementation
+// ===========================================================================
+
+// ----------------------------------------------------------------------------
+// wxMSWWindowDCImpl
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxWindowDCImpl, wxMSWDCImpl)
+
+wxWindowDCImpl::wxWindowDCImpl( wxDC *owner ) :
+   wxMSWDCImpl( owner )
+{
+}
+
+wxWindowDCImpl::wxWindowDCImpl( wxDC *owner, wxWindow *window ) :
+   wxMSWDCImpl( owner )
+{
+    wxCHECK_RET( window, wxT("invalid window in wxWindowDCImpl") );

 
 

-#include <windows.h>
+    m_window = window;
+    m_hDC = (WXHDC) ::GetWindowDC(GetHwndOf(m_window));

 
 

-#if !USE_SHARED_LIBRARY
-IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxDC)
-IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
-IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxDC)
+    // 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
 #endif

+}

 
 

-wxClientDC::wxClientDC(void)
+void wxWindowDCImpl::DoGetSize(int *width, int *height) const

 {
 {

-  m_canvas = NULL;
+    wxCHECK_RET( m_window, wxT("wxWindowDCImpl without a window?") );
+
+    m_window->GetSize(width, height);

 }
 
 }
 

-wxClientDC::wxClientDC(wxWindow *the_canvas)
+// ----------------------------------------------------------------------------
+// wxClientDCImpl
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxClientDCImpl, wxWindowDCImpl)
+
+wxClientDCImpl::wxClientDCImpl( wxDC *owner ) :
+   wxWindowDCImpl( owner )

 {
 {

-  m_canvas = the_canvas;
-//  BeginDrawing();
-  m_hDC = (WXHDC) ::GetDC((HWND) the_canvas->GetHWND());

 }
 
 }
 

-wxClientDC::~wxClientDC(void)
+wxClientDCImpl::wxClientDCImpl( wxDC *owner, wxWindow *window ) :
+   wxWindowDCImpl( owner )

 {
 {

-//  EndDrawing();
+    wxCHECK_RET( window, wxT("invalid window in wxClientDCImpl") );

 
 

-  if (m_canvas && (HDC) m_hDC)
-  {
-    SelectOldObjects(m_hDC);
+    m_window = window;
+    m_hDC = (WXHDC)::GetDC(GetHwndOf(window));

 
 

-    ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
-       m_hDC = 0;
-  }
+    // m_bOwnsDC was already set to false in the base class ctor, so the DC
+    // will be released (and not deleted) in ~wxDC
+
+    InitDC();

 }
 
 }
 

-wxWindowDC::wxWindowDC(void)
+void wxClientDCImpl::InitDC()

 {
 {

-  m_canvas = NULL;
+    wxWindowDCImpl::InitDC();
+
+    // 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__

 }
 
 }
 

-wxWindowDC::wxWindowDC(wxWindow *the_canvas)
+wxClientDCImpl::~wxClientDCImpl()

 {
 {

-  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 ++;

 }
 
 }
 

-wxWindowDC::~wxWindowDC(void)
+void wxClientDCImpl::DoGetSize(int *width, int *height) const

 {
 {

-  if (m_canvas && m_hDC)
-  {
-    SelectOldObjects(m_hDC);
+    wxCHECK_RET( m_window, wxT("wxClientDCImpl without a window?") );

 
 

-    ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
-       m_hDC = 0;
-  }
-  m_hDCCount --;
+    m_window->GetClientSize(width, height);

 }
 
 }
 

-wxPaintDC::wxPaintDC(void)
+// ----------------------------------------------------------------------------
+// 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 )

 {
 {

-  m_canvas = NULL;

 }
 
 }
 

-static PAINTSTRUCT g_paintStruct;
+wxPaintDCImpl::wxPaintDCImpl( wxDC *owner, wxWindow *window ) :
+   wxClientDCImpl( owner )
+{
+    wxCHECK_RET( window, wxT("NULL canvas in wxPaintDCImpl ctor") );
+
+#ifdef wxHAS_PAINT_DEBUG
+    if ( g_isPainting <= 0 )
+    {
+        wxFAIL_MSG( wxT("wxPaintDCImpl may be created only in EVT_PAINT handler!") );

 
 

-// Don't call Begin/EndPaint if it's already been called:
-// for example, if calling a base class OnPaint.
+        return;
+    }
+#endif // wxHAS_PAINT_DEBUG
+
+    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
+    {
+        // see comments in src/msw/window.cpp where this is defined
+        extern bool wxDidCreatePaintDC;
+
+        wxDidCreatePaintDC = true;

 
 

-WXHDC  wxPaintDC::ms_PaintHDC = 0;
-size_t wxPaintDC::ms_PaintCount = 0; // count of ms_PaintHDC usage
+        m_hDC = (WXHDC)::BeginPaint(GetHwndOf(m_window), &g_paintStruct);
+        if (m_hDC)
+            ms_cache.Add(new wxPaintDCInfo(m_window, this));
+    }

 
 

-wxPaintDC::wxPaintDC(wxWindow *canvas)
+    // 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;
+}
+
+wxPaintDCImpl::~wxPaintDCImpl()

 {
 {

-  wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
+    if ( m_hDC )
+    {
+        SelectOldObjects(m_hDC);
+
+        size_t index;
+        wxPaintDCInfo *info = FindInCache(&index);

 
 

-  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 );
+        wxCHECK_RET( info, wxT("existing DC should have a cache entry") );

 
 

-    m_hDC = ms_PaintHDC;
-    ms_PaintCount++;
-  }
-  else {
-    ms_PaintHDC =
-    m_hDC = (WXHDC)::BeginPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
-    ms_PaintCount = 1;
-    m_hDCCount++;
-  }
+        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;
+    }

 }
 
 }
 

-wxPaintDC::~wxPaintDC()
+wxPaintDCInfo *wxPaintDCImpl::FindInCache(size_t *index) const

 {
 {

-  if ( m_hDC ) {
-    if ( !--ms_PaintCount ) {
-      ::EndPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
-      m_hDCCount--;
-      m_hDC = NULL;
-      ms_PaintHDC = NULL;
+    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;
+        }

     }
     }

-    else { }//: ms_PaintHDC still in use
-  }
+
+    return info;
+}
+
+// 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;
+}
+
+/*
+ * wxPaintDCEx
+ */
+
+// TODO: don't duplicate wxPaintDCImpl code here!!
+
+class wxPaintDCExImpl: public wxPaintDCImpl
+{
+public:
+    wxPaintDCExImpl( wxDC *owner, wxWindow *window, WXHDC dc );
+    ~wxPaintDCExImpl();
+
+    int m_saveState;
+};
+
+
+IMPLEMENT_ABSTRACT_CLASS(wxPaintDCEx,wxPaintDC)
+
+wxPaintDCEx::wxPaintDCEx(wxWindow *window, WXHDC dc)
+           : wxPaintDC(new wxPaintDCExImpl(this, window, dc))
+{
+}
+
+wxPaintDCExImpl::wxPaintDCExImpl(wxDC *owner, wxWindow *window, WXHDC dc)
+               : wxPaintDCImpl( owner )
+{
+        wxCHECK_RET( dc, wxT("wxPaintDCEx requires an existing device context") );
+
+        m_saveState = 0;
+
+        m_window = window;
+
+        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);
+        }

 }
 
 }
 

+wxPaintDCExImpl::~wxPaintDCExImpl()
+{
+        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;
+}
+
+