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Add new wxCommandLinkButton class.
[wxWidgets.git] / src / html / htmlwin.cpp
diff --git a/src/html/htmlwin.cpp b/src/html/htmlwin.cpp
index 67ab8a7f66523e0e225dad5692976e28c7aab2a6..ceb2fac7c8e39ee8ae24d9cfbb753980ab1c76f9 100644 (file)
--- a/src/html/htmlwin.cpp
+++ b/src/html/htmlwin.cpp
@@ -25,22 +25,27 @@
     #include "wx/timer.h"
     #include "wx/settings.h"
     #include "wx/dataobj.h"
     #include "wx/timer.h"
     #include "wx/settings.h"
     #include "wx/dataobj.h"
+    #include "wx/statusbr.h"
 #endif
 
 #include "wx/html/htmlwin.h"
 #include "wx/html/htmlproc.h"
 #include "wx/clipbrd.h"
 #endif
 
 #include "wx/html/htmlwin.h"
 #include "wx/html/htmlproc.h"
 #include "wx/clipbrd.h"
+#include "wx/recguard.h"
 
 #include "wx/arrimpl.cpp"
 #include "wx/listimpl.cpp"
 
 
 #include "wx/arrimpl.cpp"
 #include "wx/listimpl.cpp"
 
+// uncomment this line to visually show the extent of the selection
+//#define DEBUG_HTML_SELECTION
+
 // HTML events:
 IMPLEMENT_DYNAMIC_CLASS(wxHtmlLinkEvent, wxCommandEvent)
 IMPLEMENT_DYNAMIC_CLASS(wxHtmlCellEvent, wxCommandEvent)
 
 // HTML events:
 IMPLEMENT_DYNAMIC_CLASS(wxHtmlLinkEvent, wxCommandEvent)
 IMPLEMENT_DYNAMIC_CLASS(wxHtmlCellEvent, wxCommandEvent)
 
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_HTML_CELL_CLICKED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_HTML_CELL_HOVER)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_HTML_LINK_CLICKED)
+wxDEFINE_EVENT( wxEVT_COMMAND_HTML_CELL_CLICKED, wxHtmlCellEvent );
+wxDEFINE_EVENT( wxEVT_COMMAND_HTML_CELL_HOVER, wxHtmlCellEvent );
+wxDEFINE_EVENT( wxEVT_COMMAND_HTML_LINK_CLICKED, wxHtmlLinkEvent );
 
 
 #if wxUSE_CLIPBOARD
 
 
 #if wxUSE_CLIPBOARD
@@ -70,7 +75,7 @@ private:
     int m_pos,
         m_orient;
 
     int m_pos,
         m_orient;
 
-    DECLARE_NO_COPY_CLASS(wxHtmlWinAutoScrollTimer)
+    wxDECLARE_NO_COPY_CLASS(wxHtmlWinAutoScrollTimer);
 };
 
 void wxHtmlWinAutoScrollTimer::Notify()
 };
 
 void wxHtmlWinAutoScrollTimer::Notify()
@@ -243,7 +248,7 @@ bool wxHtmlWindowMouseHelper::OnCellClicked(wxHtmlCell *cell,
     {
         // if the event wasn't handled, do the default processing here:
 
     {
         // if the event wasn't handled, do the default processing here:
 
-        wxASSERT_MSG( cell, _T("can't be called with NULL cell") );
+        wxASSERT_MSG( cell, wxT("can't be called with NULL cell") );
 
         cell->ProcessMouseClick(m_interface, ev.GetPoint(), ev.GetMouseEvent());
     }
 
         cell->ProcessMouseClick(m_interface, ev.GetPoint(), ev.GetMouseEvent());
     }
@@ -311,8 +316,6 @@ void wxHtmlWindow::Init()
     m_timerAutoScroll = NULL;
     m_lastDoubleClick = 0;
 #endif // wxUSE_CLIPBOARD
     m_timerAutoScroll = NULL;
     m_lastDoubleClick = 0;
 #endif // wxUSE_CLIPBOARD
-    m_backBuffer = NULL;
-    m_eraseBgInOnPaint = false;
     m_tmpSelFromCell = NULL;
 }
 
     m_tmpSelFromCell = NULL;
 }
 
@@ -325,7 +328,20 @@ bool wxHtmlWindow::Create(wxWindow *parent, wxWindowID id,
                                   name))
         return false;
 
                                   name))
         return false;
 
+    // We can't erase our background in EVT_ERASE_BACKGROUND handler and use
+    // double buffering in EVT_PAINT handler as this requires blitting back
+    // something already drawn on the window to the backing store bitmap when
+    // handling EVT_PAINT but blitting in this direction is simply not
+    // supported by OS X.
+    //
+    // So instead we use a hack with artificial EVT_ERASE_BACKGROUND generation
+    // from OnPaint() and this means that we never need the "real" erase event
+    // at all so disable it to avoid executing any user-defined handlers twice
+    // (and to avoid processing unnecessary event if no handlers are defined).
+    SetBackgroundStyle(wxBG_STYLE_PAINT);
     SetPage(wxT("<html><body></body></html>"));
     SetPage(wxT("<html><body></body></html>"));
+
+    SetInitialSize(size);
     return true;
 }
 
     return true;
 }
 
@@ -350,7 +366,6 @@ wxHtmlWindow::~wxHtmlWindow()
     delete m_FS;
     delete m_History;
     delete m_Processors;
     delete m_FS;
     delete m_History;
     delete m_Processors;
-    delete m_backBuffer;
 }
 
 
 }
 
 
@@ -454,11 +469,13 @@ bool wxHtmlWindow::DoSetPage(const wxString& source)
     SetBackgroundImage(wxNullBitmap);
 
     m_Parser->SetDC(dc);
     SetBackgroundImage(wxNullBitmap);
 
     m_Parser->SetDC(dc);
-    if (m_Cell)
-    {
-        delete m_Cell;
-        m_Cell = NULL;
-    }
+
+    // notice that it's important to set m_Cell to NULL here before calling
+    // Parse() below, even if it will be overwritten by its return value as
+    // without this we may crash if it's used from inside Parse(), so use
+    // wxDELETE() and not just delete here
+    wxDELETE(m_Cell);
+
     m_Cell = (wxHtmlContainerCell*) m_Parser->Parse(newsrc);
     delete dc;
     m_Cell->SetIndent(m_Borders, wxHTML_INDENT_ALL, wxHTML_UNITS_PIXELS);
     m_Cell = (wxHtmlContainerCell*) m_Parser->Parse(newsrc);
     delete dc;
     m_Cell->SetIndent(m_Borders, wxHTML_INDENT_ALL, wxHTML_UNITS_PIXELS);
@@ -640,6 +657,16 @@ bool wxHtmlWindow::ScrollToAnchor(const wxString& anchor)
     }
     else
     {
     }
     else
     {
+        // Go to next visible cell in current container, if it exists. This
+        // yields a bit better (even though still imperfect) results in that
+        // there's better chance of using a suitable cell for upper Y
+        // coordinate value. See bug #11406 for additional discussion.
+        const wxHtmlCell *c_save = c;
+        while ( c && c->IsFormattingCell() )
+            c = c->GetNext();
+        if ( !c )
+            c = c_save;
+
         int y;
 
         for (y = 0; c != NULL; c = c->GetParent()) y += c->GetPosY();
         int y;
 
         for (y = 0; c != NULL; c = c->GetParent()) y += c->GetPosY();
@@ -662,44 +689,116 @@ void wxHtmlWindow::OnSetTitle(const wxString& title)
 }
 
 
 }
 
 
-
+// return scroll steps such that a) scrollbars aren't shown needlessly
+// and b) entire content is viewable (i.e. round up)
+static int ScrollSteps(int size, int available)
+{
+    if ( size <= available )
+        return 0;
+    else
+        return (size + wxHTML_SCROLL_STEP - 1) / wxHTML_SCROLL_STEP;
+}
 
 
 void wxHtmlWindow::CreateLayout()
 {
 
 
 void wxHtmlWindow::CreateLayout()
 {
-    int ClientWidth, ClientHeight;
+    // SetScrollbars() results in size change events -- and thus a nested
+    // CreateLayout() call -- on some platforms. Ignore nested calls, toplevel
+    // CreateLayout() will do the right thing eventually.
+    static wxRecursionGuardFlag s_flagReentrancy;
+    wxRecursionGuard guard(s_flagReentrancy);
+    if ( guard.IsInside() )
+        return;
+
+    if (!m_Cell)
+        return;
+
+    int clientWidth, clientHeight;
+    GetClientSize(&clientWidth, &clientHeight);
 
 
-    if (!m_Cell) return;
+    const int vscrollbar = wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
+    const int hscrollbar = wxSystemSettings::GetMetric(wxSYS_HSCROLL_Y);
+
+    if ( HasScrollbar(wxHORIZONTAL) )
+        clientHeight += hscrollbar;
+
+    if ( HasScrollbar(wxVERTICAL) )
+        clientWidth += vscrollbar;
 
     if ( HasFlag(wxHW_SCROLLBAR_NEVER) )
     {
         SetScrollbars(1, 1, 0, 0); // always off
 
     if ( HasFlag(wxHW_SCROLLBAR_NEVER) )
     {
         SetScrollbars(1, 1, 0, 0); // always off
-        GetClientSize(&ClientWidth, &ClientHeight);
-        m_Cell->Layout(ClientWidth);
+        m_Cell->Layout(clientWidth);
     }
     else // !wxHW_SCROLLBAR_NEVER
     {
     }
     else // !wxHW_SCROLLBAR_NEVER
     {
-        GetClientSize(&ClientWidth, &ClientHeight);
-        m_Cell->Layout(ClientWidth);
-        if (ClientHeight < m_Cell->GetHeight() + GetCharHeight())
+        // Lay the content out with the assumption that it's too large to fit
+        // in the window (this is likely to be the case):
+        m_Cell->Layout(clientWidth - vscrollbar);
+
+        // If the layout is wider than the window, horizontal scrollbar will
+        // certainly be shown. Account for it here for subsequent computations.
+        if ( m_Cell->GetWidth() > clientWidth )
+            clientHeight -= hscrollbar;
+
+        if ( m_Cell->GetHeight() <= clientHeight )
         {
         {
-            SetScrollbars(
-                  wxHTML_SCROLL_STEP, wxHTML_SCROLL_STEP,
-                  m_Cell->GetWidth() / wxHTML_SCROLL_STEP,
-                  (m_Cell->GetHeight() + GetCharHeight()) / wxHTML_SCROLL_STEP
-                  /*cheat: top-level frag is always container*/);
+            // we fit into the window, hide vertical scrollbar:
+            SetScrollbars
+            (
+                wxHTML_SCROLL_STEP, wxHTML_SCROLL_STEP,
+                ScrollSteps(m_Cell->GetWidth(), clientWidth - vscrollbar),
+                0
+            );
+            // ...and redo the layout to use the extra space
+            m_Cell->Layout(clientWidth);
         }
         }
-        else /* we fit into window, no need for scrollbars */
+        else
         {
         {
-            SetScrollbars(wxHTML_SCROLL_STEP, 1, m_Cell->GetWidth() / wxHTML_SCROLL_STEP, 0); // disable...
-            GetClientSize(&ClientWidth, &ClientHeight);
-            m_Cell->Layout(ClientWidth); // ...and relayout
+            // If the content doesn't fit into the window by only a small
+            // margin, chances are that it may fit fully with scrollbar turned
+            // off. It's something worth trying but on the other hand, we don't
+            // want to waste too much time redoing the layout (twice!) for
+            // long -- and thus expensive to layout -- pages. The cut-off value
+            // is an arbitrary heuristics.
+            static const int SMALL_OVERLAP = 60;
+            if ( m_Cell->GetHeight() <= clientHeight + SMALL_OVERLAP )
+            {
+                m_Cell->Layout(clientWidth);
+
+                if ( m_Cell->GetHeight() <= clientHeight )
+                {
+                    // Great, we fit in. Hide the scrollbar.
+                    SetScrollbars
+                    (
+                        wxHTML_SCROLL_STEP, wxHTML_SCROLL_STEP,
+                        ScrollSteps(m_Cell->GetWidth(), clientWidth),
+                        0
+                    );
+                    return;
+                }
+                else
+                {
+                    // That didn't work out, go back to previous layout. Note
+                    // that redoing the layout once again here isn't as bad as
+                    // it looks -- thanks to the small cut-off value, it's a
+                    // reasonably small page.
+                    m_Cell->Layout(clientWidth - vscrollbar);
+                }
+            }
+            // else: the page is very long, it will certainly need scrollbar
+
+            SetScrollbars
+            (
+                wxHTML_SCROLL_STEP, wxHTML_SCROLL_STEP,
+                ScrollSteps(m_Cell->GetWidth(), clientWidth - vscrollbar),
+                ScrollSteps(m_Cell->GetHeight(), clientHeight)
+            );
         }
     }
 }
 
         }
     }
 }
 
-
-
+#if wxUSE_CONFIG
 void wxHtmlWindow::ReadCustomization(wxConfigBase *cfg, wxString path)
 {
     wxString oldpath;
 void wxHtmlWindow::ReadCustomization(wxConfigBase *cfg, wxString path)
 {
     wxString oldpath;
@@ -752,8 +851,7 @@ void wxHtmlWindow::WriteCustomization(wxConfigBase *cfg, wxString path)
     if (path != wxEmptyString)
         cfg->SetPath(oldpath);
 }
     if (path != wxEmptyString)
         cfg->SetPath(oldpath);
 }
-
-
+#endif // wxUSE_CONFIG
 
 bool wxHtmlWindow::HistoryBack()
 {
 
 bool wxHtmlWindow::HistoryBack()
 {
@@ -889,21 +987,27 @@ wxString wxHtmlWindow::DoSelectionToText(wxHtmlSelection *sel)
         return wxEmptyString;
 
     wxClientDC dc(this);
         return wxEmptyString;
 
     wxClientDC dc(this);
-
-    const wxHtmlCell *end = sel->GetToCell();
     wxString text;
     wxString text;
-    wxHtmlTerminalCellsInterator i(sel->GetFromCell(), end);
-    if ( i )
-    {
-        text << i->ConvertToText(sel);
-        ++i;
-    }
-    const wxHtmlCell *prev = *i;
+
+    wxHtmlTerminalCellsInterator i(sel->GetFromCell(), sel->GetToCell());
+    const wxHtmlCell *prev = NULL;
+
     while ( i )
     {
     while ( i )
     {
-        if ( prev->GetParent() != i->GetParent() )
-            text << _T('\n');
-        text << i->ConvertToText(*i == end ? sel : NULL);
+        // When converting HTML content to plain text, the entire paragraph
+        // (container in wxHTML) goes on single line. A new paragraph (that
+        // should go on its own line) has its own container. Therefore, the
+        // simplest way of detecting where to insert newlines in plain text
+        // is to check if the parent container changed -- if it did, we moved
+        // to a new paragraph.
+        if ( prev && prev->GetParent() != i->GetParent() )
+            text << '\n';
+
+        // NB: we don't need to pass the selection to ConvertToText() in the
+        //     middle of the selected text; it's only useful when only part of
+        //     a cell is selected
+        text << i->ConvertToText(sel);
+
         prev = *i;
         ++i;
     }
         prev = *i;
         ++i;
     }
@@ -945,7 +1049,7 @@ bool wxHtmlWindow::CopySelection(ClipboardType t)
             const wxString txt(SelectionToText());
             wxTheClipboard->SetData(new wxTextDataObject(txt));
             wxTheClipboard->Close();
             const wxString txt(SelectionToText());
             wxTheClipboard->SetData(new wxTextDataObject(txt));
             wxTheClipboard->Close();
-            wxLogTrace(_T("wxhtmlselection"),
+            wxLogTrace(wxT("wxhtmlselection"),
                        _("Copied to clipboard:\"%s\""), txt.c_str());
 
             return true;
                        _("Copied to clipboard:\"%s\""), txt.c_str());
 
             return true;
@@ -972,90 +1076,90 @@ void wxHtmlWindow::OnLinkClicked(const wxHtmlLinkInfo& link)
     }
 }
 
     }
 }
 
-void wxHtmlWindow::OnEraseBackground(wxEraseEvent& event)
+void wxHtmlWindow::DoEraseBackground(wxDC& dc)
 {
 {
-    if ( !m_bmpBg.Ok() )
-    {
-        // don't even skip the event, if we don't have a bg bitmap we're going
-        // to overwrite background in OnPaint() below anyhow, so letting the
-        // default handling take place would only result in flicker, just set a
-        // flag to erase the background below
-        m_eraseBgInOnPaint = true;
-        return;
-    }
-
-    wxDC& dc = *event.GetDC();
-
-    // if the image is not fully opaque, we have to erase the background before
-    // drawing it, however avoid doing it for opaque images as this would just
-    // result in extra flicker without any other effect as background is
-    // completely covered anyhow
-    if ( m_bmpBg.GetMask() )
+    // if we don't have any background bitmap we just fill it with background
+    // colour and we also must do it if the background bitmap is not fully
+    // opaque as otherwise junk could be left there
+    if ( !m_bmpBg.IsOk() || m_bmpBg.GetMask() )
     {
     {
-        dc.SetBackground(wxBrush(GetBackgroundColour(), wxBRUSHSTYLE_SOLID));
+        dc.SetBackground(GetBackgroundColour());
         dc.Clear();
     }
 
         dc.Clear();
     }
 
-    const wxSize sizeWin(GetClientSize());
-    const wxSize sizeBmp(m_bmpBg.GetWidth(), m_bmpBg.GetHeight());
-    for ( wxCoord x = 0; x < sizeWin.x; x += sizeBmp.x )
+    if ( m_bmpBg.IsOk() )
     {
     {
-        for ( wxCoord y = 0; y < sizeWin.y; y += sizeBmp.y )
+        // draw the background bitmap tiling it over the entire window area
+        const wxSize sz = GetClientSize();
+        const wxSize sizeBmp(m_bmpBg.GetWidth(), m_bmpBg.GetHeight());
+        for ( wxCoord x = 0; x < sz.x; x += sizeBmp.x )
         {
         {
-            dc.DrawBitmap(m_bmpBg, x, y, true /* use mask */);
+            for ( wxCoord y = 0; y < sz.y; y += sizeBmp.y )
+            {
+                dc.DrawBitmap(m_bmpBg, x, y, true /* use mask */);
+            }
         }
     }
 }
 
 void wxHtmlWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 {
         }
     }
 }
 
 void wxHtmlWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 {
-    wxPaintDC dc(this);
+    wxPaintDC dcPaint(this);
 
     if (m_tmpCanDrawLocks > 0 || m_Cell == NULL)
         return;
 
     int x, y;
     GetViewStart(&x, &y);
 
     if (m_tmpCanDrawLocks > 0 || m_Cell == NULL)
         return;
 
     int x, y;
     GetViewStart(&x, &y);
-    wxRect rect = GetUpdateRegion().GetBox();
-    wxSize sz = GetSize();
-
+    const wxRect rect = GetUpdateRegion().GetBox();
+    const wxSize sz = GetClientSize();
+
+    // set up the DC we're drawing on: if the window is already double buffered
+    // we do it directly on wxPaintDC, otherwise we allocate a backing store
+    // buffer and compose the drawing there and then blit it to screen all at
+    // once
+    wxDC *dc;
     wxMemoryDC dcm;
     wxMemoryDC dcm;
-    if ( !m_backBuffer )
-        m_backBuffer = new wxBitmap(sz.x, sz.y);
-    dcm.SelectObject(*m_backBuffer);
-
-    if ( m_eraseBgInOnPaint )
+    if ( IsDoubleBuffered() )
     {
     {
-        dcm.SetBackground(wxBrush(GetBackgroundColour(), wxBRUSHSTYLE_SOLID));
-        dcm.Clear();
-
-        m_eraseBgInOnPaint = false;
+        dc = &dcPaint;
     }
     }
-    else // someone has already erased the background, keep it
+    else // window is not double buffered by the system, do it ourselves
+    {
+        if ( !m_backBuffer.IsOk() )
+            m_backBuffer.Create(sz.x, sz.y);
+        dcm.SelectObject(m_backBuffer);
+        dc = &dcm;
+    }
+
+    PrepareDC(*dc);
+
+    // erase the background: for compatibility, we must generate the event to
+    // allow the user-defined handlers to do it
+    wxEraseEvent eraseEvent(GetId(), dc);
+    eraseEvent.SetEventObject(this);
+    if ( !ProcessWindowEvent(eraseEvent) )
     {
     {
-        // preserve the existing background, otherwise we'd erase anything the
-        // user code had drawn in its EVT_ERASE_BACKGROUND handler when we do
-        // the Blit back below
-        dcm.Blit(0, rect.GetTop(),
-                 sz.x, rect.GetBottom() - rect.GetTop() + 1,
-                 &dc,
-                 0, rect.GetTop());
+        // erase background ourselves
+        DoEraseBackground(*dc);
     }
     }
+    //else: background erased by the user-defined handler
 
 
-    PrepareDC(dcm);
-    dcm.SetMapMode(wxMM_TEXT);
-    dcm.SetBackgroundMode(wxBRUSHSTYLE_TRANSPARENT);
+
+    // draw the HTML window contents
+    dc->SetMapMode(wxMM_TEXT);
+    dc->SetBackgroundMode(wxBRUSHSTYLE_TRANSPARENT);
+    dc->SetLayoutDirection(GetLayoutDirection());
 
     wxHtmlRenderingInfo rinfo;
     wxDefaultHtmlRenderingStyle rstyle;
     rinfo.SetSelection(m_selection);
     rinfo.SetStyle(&rstyle);
 
     wxHtmlRenderingInfo rinfo;
     wxDefaultHtmlRenderingStyle rstyle;
     rinfo.SetSelection(m_selection);
     rinfo.SetStyle(&rstyle);
-    m_Cell->Draw(dcm, 0, 0,
+    m_Cell->Draw(*dc, 0, 0,
                  y * wxHTML_SCROLL_STEP + rect.GetTop(),
                  y * wxHTML_SCROLL_STEP + rect.GetBottom(),
                  rinfo);
 
                  y * wxHTML_SCROLL_STEP + rect.GetTop(),
                  y * wxHTML_SCROLL_STEP + rect.GetBottom(),
                  rinfo);
 
-//#define DEBUG_HTML_SELECTION
 #ifdef DEBUG_HTML_SELECTION
     {
     int xc, yc, x, y;
 #ifdef DEBUG_HTML_SELECTION
     {
     int xc, yc, x, y;
@@ -1068,27 +1172,30 @@ void wxHtmlWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
     wxHtmlCell *after =
         m_Cell->FindCellByPos(x, y, wxHTML_FIND_NEAREST_AFTER);
 
     wxHtmlCell *after =
         m_Cell->FindCellByPos(x, y, wxHTML_FIND_NEAREST_AFTER);
 
-    dcm.SetBrush(*wxTRANSPARENT_BRUSH);
-    dcm.SetPen(*wxBLACK_PEN);
+    dc->SetBrush(*wxTRANSPARENT_BRUSH);
+    dc->SetPen(*wxBLACK_PEN);
     if (at)
     if (at)
-        dcm.DrawRectangle(at->GetAbsPos(),
+        dc->DrawRectangle(at->GetAbsPos(),
                           wxSize(at->GetWidth(),at->GetHeight()));
                           wxSize(at->GetWidth(),at->GetHeight()));
-    dcm.SetPen(*wxGREEN_PEN);
+    dc->SetPen(*wxGREEN_PEN);
     if (before)
     if (before)
-        dcm.DrawRectangle(before->GetAbsPos().x+1, before->GetAbsPos().y+1,
+        dc->DrawRectangle(before->GetAbsPos().x+1, before->GetAbsPos().y+1,
                           before->GetWidth()-2,before->GetHeight()-2);
                           before->GetWidth()-2,before->GetHeight()-2);
-    dcm.SetPen(*wxRED_PEN);
+    dc->SetPen(*wxRED_PEN);
     if (after)
     if (after)
-        dcm.DrawRectangle(after->GetAbsPos().x+2, after->GetAbsPos().y+2,
+        dc->DrawRectangle(after->GetAbsPos().x+2, after->GetAbsPos().y+2,
                           after->GetWidth()-4,after->GetHeight()-4);
     }
                           after->GetWidth()-4,after->GetHeight()-4);
     }
-#endif
+#endif // DEBUG_HTML_SELECTION
 
 
-    dcm.SetDeviceOrigin(0,0);
-    dc.Blit(0, rect.GetTop(),
-            sz.x, rect.GetBottom() - rect.GetTop() + 1,
-            &dcm,
-            0, rect.GetTop());
+    if ( dc != &dcPaint )
+    {
+        dc->SetDeviceOrigin(0,0);
+        dcPaint.Blit(0, rect.GetTop(),
+                     sz.x, rect.GetBottom() - rect.GetTop() + 1,
+                     dc,
+                     0, rect.GetTop());
+    }
 }
 
 
 }
 
 
@@ -1096,9 +1203,10 @@ void wxHtmlWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 
 void wxHtmlWindow::OnSize(wxSizeEvent& event)
 {
 
 void wxHtmlWindow::OnSize(wxSizeEvent& event)
 {
-    wxDELETE(m_backBuffer);
+    event.Skip();
+
+    m_backBuffer = wxNullBitmap;
 
 
-    wxScrolledWindow::OnSize(event);
     CreateLayout();
 
     // Recompute selection if necessary:
     CreateLayout();
 
     // Recompute selection if necessary:
@@ -1381,7 +1489,7 @@ void wxHtmlWindow::OnMouseLeave(wxMouseEvent& event)
                 // but seems to happen sometimes under wxMSW - maybe it's a bug
                 // there but for now just ignore it
 
                 // but seems to happen sometimes under wxMSW - maybe it's a bug
                 // there but for now just ignore it
 
-                //wxFAIL_MSG( _T("can't understand where has mouse gone") );
+                //wxFAIL_MSG( wxT("can't understand where has mouse gone") );
 
                 return;
             }
 
                 return;
             }
@@ -1559,7 +1667,6 @@ BEGIN_EVENT_TABLE(wxHtmlWindow, wxScrolledWindow)
     EVT_LEFT_UP(wxHtmlWindow::OnMouseUp)
     EVT_RIGHT_UP(wxHtmlWindow::OnMouseUp)
     EVT_MOTION(wxHtmlWindow::OnMouseMove)
     EVT_LEFT_UP(wxHtmlWindow::OnMouseUp)
     EVT_RIGHT_UP(wxHtmlWindow::OnMouseUp)
     EVT_MOTION(wxHtmlWindow::OnMouseMove)
-    EVT_ERASE_BACKGROUND(wxHtmlWindow::OnEraseBackground)
     EVT_PAINT(wxHtmlWindow::OnPaint)
 #if wxUSE_CLIPBOARD
     EVT_LEFT_DCLICK(wxHtmlWindow::OnDoubleClick)
     EVT_PAINT(wxHtmlWindow::OnPaint)
 #if wxUSE_CLIPBOARD
     EVT_LEFT_DCLICK(wxHtmlWindow::OnDoubleClick)
wxWidgets (Impactor)