src/msw/nonownedwnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/nonownedwnd.cpp
   3 // Purpose:     wxNonOwnedWindow implementation for MSW.
   4 // Author:      Vadim Zeitlin
   5 // Created:     2011-10-09 (extracted from src/msw/toplevel.cpp)
   6 // RCS-ID:      $Id: $
   7 // Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 // This class can't be implemented and hence is not used under Win CE.
  27 #ifndef __WXWINCE__
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/dcclient.h"
  31     #include "wx/frame.h"       // Only for wxFRAME_SHAPED.
  32     #include "wx/region.h"
  33     #include "wx/msw/private.h"
  34 #endif // WX_PRECOMP
  35
  36 #include "wx/nonownedwnd.h"
  37
  38 #include "wx/msw/wrapgdip.h"
  39 #include "wx/graphics.h"
  40 #include "wx/scopedptr.h"
  41
  42 // ============================================================================
  43 // wxNonOwnedWindow implementation
  44 // ============================================================================
  45
  46 bool wxNonOwnedWindow::DoClearShape()
  47 {
  48     if (::SetWindowRgn(GetHwnd(), NULL, TRUE) == 0)
  49     {
  50         wxLogLastError(wxT("SetWindowRgn"));
  51         return false;
  52     }
  53
  54     return true;
  55 }
  56
  57 bool wxNonOwnedWindow::DoSetRegionShape(const wxRegion& region)
  58 {
  59     // Windows takes ownership of the region, so
  60     // we'll have to make a copy of the region to give to it.
  61     DWORD noBytes = ::GetRegionData(GetHrgnOf(region), 0, NULL);
  62     RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
  63     ::GetRegionData(GetHrgnOf(region), noBytes, rgnData);
  64     HRGN hrgn = ::ExtCreateRegion(NULL, noBytes, rgnData);
  65     delete[] (char*) rgnData;
  66
  67     // SetWindowRgn expects the region to be in coordinates
  68     // relative to the window, not the client area.
  69     const wxPoint clientOrigin = GetClientAreaOrigin();
  70     ::OffsetRgn(hrgn, -clientOrigin.x, -clientOrigin.y);
  71
  72     // Now call the shape API with the new region.
  73     if (::SetWindowRgn(GetHwnd(), hrgn, TRUE) == 0)
  74     {
  75         wxLogLastError(wxT("SetWindowRgn"));
  76         return false;
  77     }
  78     return true;
  79 }
  80
  81 #if wxUSE_GRAPHICS_CONTEXT
  82
  83 #include "wx/msw/wrapgdip.h"
  84
  85 // This class contains data used only when SetPath(wxGraphicsPath) is called.
  86 //
  87 // Notice that it derives from wxEvtHandler solely to allow Connect()-ing its
  88 // OnPaint() method to the window, we could get rid of this inheritance once
  89 // Bind() can be used in wx sources.
  90 class wxNonOwnedWindowShapeImpl : public wxEvtHandler
  91 {
  92 public:
  93     wxNonOwnedWindowShapeImpl(wxNonOwnedWindow* win, const wxGraphicsPath& path) :
  94         m_win(win),
  95         m_path(path)
  96     {
  97         // Create the region corresponding to this path and set it as windows
  98         // shape.
  99         wxScopedPtr<wxGraphicsContext> context(wxGraphicsContext::Create(win));
 100         Region gr(static_cast<GraphicsPath*>(m_path.GetNativePath()));
 101         win->SetShape(
 102             wxRegion(
 103                 gr.GetHRGN(static_cast<Graphics*>(context->GetNativeContext()))
 104             )
 105         );
 106
 107
 108         // Connect to the paint event to draw the border.
 109         //
 110         // TODO: Do this only optionally?
 111         m_win->Connect
 112                (
 113                 wxEVT_PAINT,
 114                 wxPaintEventHandler(wxNonOwnedWindowShapeImpl::OnPaint),
 115                 NULL,
 116                 this
 117                );
 118     }
 119
 120     virtual ~wxNonOwnedWindowShapeImpl()
 121     {
 122         m_win->Disconnect
 123                (
 124                 wxEVT_PAINT,
 125                 wxPaintEventHandler(wxNonOwnedWindowShapeImpl::OnPaint),
 126                 NULL,
 127                 this
 128                );
 129     }
 130
 131 private:
 132     void OnPaint(wxPaintEvent& event)
 133     {
 134         event.Skip();
 135
 136         wxPaintDC dc(m_win);
 137         wxScopedPtr<wxGraphicsContext> context(wxGraphicsContext::Create(dc));
 138         context->SetPen(wxPen(*wxLIGHT_GREY, 2));
 139         context->StrokePath(m_path);
 140     }
 141
 142     wxNonOwnedWindow* const m_win;
 143     wxGraphicsPath m_path;
 144
 145     wxDECLARE_NO_COPY_CLASS(wxNonOwnedWindowShapeImpl);
 146 };
 147
 148 wxNonOwnedWindow::wxNonOwnedWindow()
 149 {
 150     m_shapeImpl = NULL;
 151 }
 152
 153 wxNonOwnedWindow::~wxNonOwnedWindow()
 154 {
 155     delete m_shapeImpl;
 156 }
 157
 158 bool wxNonOwnedWindow::DoSetPathShape(const wxGraphicsPath& path)
 159 {
 160     delete m_shapeImpl;
 161     m_shapeImpl = new wxNonOwnedWindowShapeImpl(this, path);
 162
 163     return true;
 164 }
 165
 166 #else // !wxUSE_GRAPHICS_CONTEXT
 167
 168 // Trivial ctor and dtor as we don't have anything to do when wxGraphicsContext
 169 // is not used but still define them here to avoid adding even more #if checks
 170 // to the header, it it doesn't do any harm even though it's not needed.
 171 wxNonOwnedWindow::wxNonOwnedWindow()
 172 {
 173 }
 174
 175 wxNonOwnedWindow::~wxNonOwnedWindow()
 176 {
 177 }
 178
 179 #endif // wxUSE_GRAPHICS_CONTEXT/!wxUSE_GRAPHICS_CONTEXT
 180
 181 #endif // !__WXWINCE__