class MyHtmlWindow : public wxHtmlWindow
{
public:
- MyHtmlWindow(wxWindow *parent) : wxHtmlWindow( parent ) { }
+ MyHtmlWindow(wxWindow *parent) : wxHtmlWindow( parent )
+ {
+ // no custom background initially to avoid confusing people
+ m_drawCustomBg = false;
+ }
virtual wxHtmlOpeningStatus OnOpeningURL(wxHtmlURLType WXUNUSED(type),
const wxString& WXUNUSED(url),
wxString *WXUNUSED(redirect)) const;
+ // toggle drawing of custom background
+ void DrawCustomBg(bool draw)
+ {
+ m_drawCustomBg = draw;
+ Refresh();
+ }
+
private:
+#if wxUSE_CLIPBOARD
void OnClipboardEvent(wxClipboardTextEvent& event);
+#endif // wxUSE_CLIPBOARD
+ void OnEraseBgEvent(wxEraseEvent& event);
+
+ bool m_drawCustomBg;
-#if wxUSE_CLIPBOARD
DECLARE_EVENT_TABLE()
-#endif // wxUSE_CLIPBOARD
wxDECLARE_NO_COPY_CLASS(MyHtmlWindow);
};
void OnBack(wxCommandEvent& event);
void OnForward(wxCommandEvent& event);
void OnProcessor(wxCommandEvent& event);
+ void OnDrawCustomBg(wxCommandEvent& event);
void OnHtmlLinkClicked(wxHtmlLinkEvent& event);
void OnHtmlCellHover(wxHtmlCellEvent &event);
ID_DefaultWebBrowser,
ID_Back,
ID_Forward,
- ID_Processor
+ ID_Processor,
+ ID_DrawCustomBg
};
// ----------------------------------------------------------------------------
EVT_MENU(ID_Back, MyFrame::OnBack)
EVT_MENU(ID_Forward, MyFrame::OnForward)
EVT_MENU(ID_Processor, MyFrame::OnProcessor)
+ EVT_MENU(ID_DrawCustomBg, MyFrame::OnDrawCustomBg)
EVT_HTML_LINK_CLICKED(wxID_ANY, MyFrame::OnHtmlLinkClicked)
EVT_HTML_CELL_HOVER(wxID_ANY, MyFrame::OnHtmlCellHover)
menuFile->AppendSeparator();
menuFile->Append(ID_Processor, _("&Remove bold attribute"),
wxEmptyString, wxITEM_CHECK);
-
+ menuFile->AppendSeparator();
+ menuFile->AppendCheckItem(ID_DrawCustomBg, "&Draw custom background");
menuFile->AppendSeparator();
menuFile->Append(wxID_EXIT, _("&Close frame"));
menuNav->Append(ID_Back, _("Go &BACK"));
m_Html->LoadPage(m_Html->GetOpenedPage());
}
+void MyFrame::OnDrawCustomBg(wxCommandEvent& event)
+{
+ m_Html->DrawCustomBg(event.IsChecked());
+}
+
void MyFrame::OnHtmlLinkClicked(wxHtmlLinkEvent &event)
{
wxLogMessage(wxT("The url '%s' has been clicked!"), event.GetLinkInfo().GetHref().c_str());
return wxHTML_OPEN;
}
-#if wxUSE_CLIPBOARD
BEGIN_EVENT_TABLE(MyHtmlWindow, wxHtmlWindow)
+#if wxUSE_CLIPBOARD
EVT_TEXT_COPY(wxID_ANY, MyHtmlWindow::OnClipboardEvent)
+#endif // wxUSE_CLIPBOARD
+ EVT_ERASE_BACKGROUND(MyHtmlWindow::OnEraseBgEvent)
END_EVENT_TABLE()
+#if wxUSE_CLIPBOARD
void MyHtmlWindow::OnClipboardEvent(wxClipboardTextEvent& WXUNUSED(event))
{
// explicitly call wxHtmlWindow::CopySelection() method
wxLogStatus(_T("Clipboard: nothing"));
}
#endif // wxUSE_CLIPBOARD
+
+void MyHtmlWindow::OnEraseBgEvent(wxEraseEvent& event)
+{
+ if ( !m_drawCustomBg )
+ {
+ event.Skip();
+ return;
+ }
+
+ // draw a background grid to show that this handler is indeed executed
+
+ wxDC& dc = *event.GetDC();
+ dc.SetPen(*wxBLUE_PEN);
+ dc.Clear();
+
+ const wxSize size = GetVirtualSize();
+ for ( int x = 0; x < size.x; x += 15 )
+ {
+ dc.DrawLine(x, 0, x, size.y);
+ }
+
+ for ( int y = 0; y < size.y; y += 15 )
+ {
+ dc.DrawLine(0, y, size.x, y);
+ }
+}
+
#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)
m_timerAutoScroll = NULL;
m_lastDoubleClick = 0;
#endif // wxUSE_CLIPBOARD
- m_backBuffer = NULL;
- m_eraseBgInOnPaint = false;
m_tmpSelFromCell = NULL;
}
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>"));
return true;
}
delete m_FS;
delete m_History;
delete m_Processors;
- delete m_backBuffer;
}
}
}
-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();
}
- 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))
{
- wxPaintDC dc(this);
+ wxPaintDC dcPaint(this);
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;
- 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 // 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;
}
- else // someone has already erased the background, keep it
+
+ 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);
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);
-//#define DEBUG_HTML_SELECTION
#ifdef DEBUG_HTML_SELECTION
{
int xc, yc, x, y;
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)
- dcm.DrawRectangle(at->GetAbsPos(),
+ dc->DrawRectangle(at->GetAbsPos(),
wxSize(at->GetWidth(),at->GetHeight()));
- dcm.SetPen(*wxGREEN_PEN);
+ dc->SetPen(*wxGREEN_PEN);
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);
- dcm.SetPen(*wxRED_PEN);
+ dc->SetPen(*wxRED_PEN);
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);
}
-#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());
+ }
}
{
event.Skip();
- wxDELETE(m_backBuffer);
+ m_backBuffer = wxNullBitmap;
CreateLayout();
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)
projects / wxWidgets.git / commitdiff
