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 // Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // declarations
  12 // ============================================================================
  13
  14 // ----------------------------------------------------------------------------
  15 // headers
  16 // ----------------------------------------------------------------------------
  17
  18 // for compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #ifdef __BORLANDC__
  22     #pragma hdrstop
  23 #endif
  24
  25 // This class can't be implemented and hence is not used under Win CE.
  26 #ifndef __WXWINCE__
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/dcclient.h"
  30     #include "wx/frame.h"       // Only for wxFRAME_SHAPED.
  31     #include "wx/region.h"
  32     #include "wx/msw/private.h"
  33 #endif // WX_PRECOMP
  34
  35 #include "wx/nonownedwnd.h"
  36
  37 #if wxUSE_GRAPHICS_CONTEXT
  38     #include "wx/msw/wrapgdip.h"
  39     #include "wx/graphics.h"
  40 #endif // wxUSE_GRAPHICS_CONTEXT
  41
  42 #include "wx/scopedptr.h"
  43
  44 // ============================================================================
  45 // wxNonOwnedWindow implementation
  46 // ============================================================================
  47
  48 bool wxNonOwnedWindow::DoClearShape()
  49 {
  50     if (::SetWindowRgn(GetHwnd(), NULL, TRUE) == 0)
  51     {
  52         wxLogLastError(wxT("SetWindowRgn"));
  53         return false;
  54     }
  55
  56     return true;
  57 }
  58
  59 bool wxNonOwnedWindow::DoSetRegionShape(const wxRegion& region)
  60 {
  61     // Windows takes ownership of the region, so
  62     // we'll have to make a copy of the region to give to it.
  63     DWORD noBytes = ::GetRegionData(GetHrgnOf(region), 0, NULL);
  64     RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
  65     ::GetRegionData(GetHrgnOf(region), noBytes, rgnData);
  66     HRGN hrgn = ::ExtCreateRegion(NULL, noBytes, rgnData);
  67     delete[] (char*) rgnData;
  68
  69     // SetWindowRgn expects the region to be in coordinates
  70     // relative to the window, not the client area.
  71     const wxPoint clientOrigin = GetClientAreaOrigin();
  72     ::OffsetRgn(hrgn, -clientOrigin.x, -clientOrigin.y);
  73
  74     // Now call the shape API with the new region.
  75     if (::SetWindowRgn(GetHwnd(), hrgn, TRUE) == 0)
  76     {
  77         wxLogLastError(wxT("SetWindowRgn"));
  78         return false;
  79     }
  80     return true;
  81 }
  82
  83 #if wxUSE_GRAPHICS_CONTEXT
  84
  85 #include "wx/msw/wrapgdip.h"
  86
  87 // This class contains data used only when SetPath(wxGraphicsPath) is called.
  88 //
  89 // Notice that it derives from wxEvtHandler solely to allow Connect()-ing its
  90 // OnPaint() method to the window, we could get rid of this inheritance once
  91 // Bind() can be used in wx sources.
  92 class wxNonOwnedWindowShapeImpl : public wxEvtHandler
  93 {
  94 public:
  95     wxNonOwnedWindowShapeImpl(wxNonOwnedWindow* win, const wxGraphicsPath& path) :
  96         m_win(win),
  97         m_path(path)
  98     {
  99         // Create the region corresponding to this path and set it as windows
 100         // shape.
 101         wxScopedPtr<wxGraphicsContext> context(wxGraphicsContext::Create(win));
 102         Region gr(static_cast<GraphicsPath*>(m_path.GetNativePath()));
 103         win->SetShape(
 104             wxRegion(
 105                 gr.GetHRGN(static_cast<Graphics*>(context->GetNativeContext()))
 106             )
 107         );
 108
 109
 110         // Connect to the paint event to draw the border.
 111         //
 112         // TODO: Do this only optionally?
 113         m_win->Connect
 114                (
 115                 wxEVT_PAINT,
 116                 wxPaintEventHandler(wxNonOwnedWindowShapeImpl::OnPaint),
 117                 NULL,
 118                 this
 119                );
 120     }
 121
 122     virtual ~wxNonOwnedWindowShapeImpl()
 123     {
 124         m_win->Disconnect
 125                (
 126                 wxEVT_PAINT,
 127                 wxPaintEventHandler(wxNonOwnedWindowShapeImpl::OnPaint),
 128                 NULL,
 129                 this
 130                );
 131     }
 132
 133 private:
 134     void OnPaint(wxPaintEvent& event)
 135     {
 136         event.Skip();
 137
 138         wxPaintDC dc(m_win);
 139         wxScopedPtr<wxGraphicsContext> context(wxGraphicsContext::Create(dc));
 140         context->SetPen(wxPen(*wxLIGHT_GREY, 2));
 141         context->StrokePath(m_path);
 142     }
 143
 144     wxNonOwnedWindow* const m_win;
 145     wxGraphicsPath m_path;
 146
 147     wxDECLARE_NO_COPY_CLASS(wxNonOwnedWindowShapeImpl);
 148 };
 149
 150 wxNonOwnedWindow::wxNonOwnedWindow()
 151 {
 152     m_shapeImpl = NULL;
 153 }
 154
 155 wxNonOwnedWindow::~wxNonOwnedWindow()
 156 {
 157     delete m_shapeImpl;
 158 }
 159
 160 bool wxNonOwnedWindow::DoSetPathShape(const wxGraphicsPath& path)
 161 {
 162     delete m_shapeImpl;
 163     m_shapeImpl = new wxNonOwnedWindowShapeImpl(this, path);
 164
 165     return true;
 166 }
 167
 168 #else // !wxUSE_GRAPHICS_CONTEXT
 169
 170 // Trivial ctor and dtor as we don't have anything to do when wxGraphicsContext
 171 // is not used but still define them here to avoid adding even more #if checks
 172 // to the header, it it doesn't do any harm even though it's not needed.
 173 wxNonOwnedWindow::wxNonOwnedWindow()
 174 {
 175 }
 176
 177 wxNonOwnedWindow::~wxNonOwnedWindow()
 178 {
 179 }
 180
 181 #endif // wxUSE_GRAPHICS_CONTEXT/!wxUSE_GRAPHICS_CONTEXT
 182
 183 #endif // !__WXWINCE__