]> git.saurik.com Git - wxWidgets.git/blob - src/msw/dcmemory.cpp
Fixed dropdown height of wxChoice and wxComboBox controls.
[wxWidgets.git] / src / msw / dcmemory.cpp
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/msw/dcmemory.cpp
3 // Purpose: wxMemoryDC class
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 01/02/97
7 // RCS-ID: $Id$
8 // Copyright: (c) Julian Smart
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ============================================================================
13 // declarations
14 // ============================================================================
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 // For compilers that support precompilation, includes "wx.h".
21 #include "wx/wxprec.h"
22
23 #ifdef __BORLANDC__
24 #pragma hdrstop
25 #endif
26
27 #include "wx/dcmemory.h"
28 #include "wx/msw/dcmemory.h"
29
30 #ifndef WX_PRECOMP
31 #include "wx/utils.h"
32 #include "wx/log.h"
33 #endif
34
35 #include "wx/msw/private.h"
36
37 // ----------------------------------------------------------------------------
38 // wxMemoryDCImpl
39 // ----------------------------------------------------------------------------
40
41 IMPLEMENT_ABSTRACT_CLASS(wxMemoryDCImpl, wxMSWDCImpl)
42
43 wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner )
44 : wxMSWDCImpl( owner )
45 {
46 CreateCompatible(NULL);
47 Init();
48 }
49
50 wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxBitmap& bitmap )
51 : wxMSWDCImpl( owner )
52 {
53 CreateCompatible(NULL);
54 Init();
55 DoSelect(bitmap);
56 }
57
58 wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxDC *dc )
59 : wxMSWDCImpl( owner )
60 {
61 wxCHECK_RET( dc, wxT("NULL dc in wxMemoryDC ctor") );
62
63 CreateCompatible(dc);
64
65 Init();
66 }
67
68 void wxMemoryDCImpl::Init()
69 {
70 if ( m_ok )
71 {
72 SetBrush(*wxWHITE_BRUSH);
73 SetPen(*wxBLACK_PEN);
74
75 // the background mode is only used for text background and is set in
76 // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
77 ::SetBkMode( GetHdc(), TRANSPARENT );
78 }
79 }
80
81 bool wxMemoryDCImpl::CreateCompatible(wxDC *dc)
82 {
83 wxDCImpl *impl = dc ? dc->GetImpl() : NULL ;
84 wxMSWDCImpl *msw_impl = wxDynamicCast( impl, wxMSWDCImpl );
85 if ( dc && !msw_impl)
86 {
87 m_ok = false;
88 return false;
89 }
90
91 m_hDC = (WXHDC)::CreateCompatibleDC(dc ? GetHdcOf(*msw_impl) : NULL);
92
93 // as we created the DC, we must delete it in the dtor
94 m_bOwnsDC = true;
95
96 m_ok = m_hDC != 0;
97
98 return m_ok;
99 }
100
101 void wxMemoryDCImpl::DoSelect( const wxBitmap& bitmap )
102 {
103 // select old bitmap out of the device context
104 if ( m_oldBitmap )
105 {
106 ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap);
107 if ( m_selectedBitmap.IsOk() )
108 {
109 m_selectedBitmap.SetSelectedInto(NULL);
110 m_selectedBitmap = wxNullBitmap;
111 }
112 }
113
114 // check for whether the bitmap is already selected into a device context
115 wxASSERT_MSG( !bitmap.GetSelectedInto() ||
116 (bitmap.GetSelectedInto() == GetOwner()),
117 wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
118
119 m_selectedBitmap = bitmap;
120 WXHBITMAP hBmp = m_selectedBitmap.GetHBITMAP();
121 if ( !hBmp )
122 return;
123
124 m_selectedBitmap.SetSelectedInto(GetOwner());
125 hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp);
126
127 if ( !hBmp )
128 {
129 wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
130
131 wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
132 }
133 else if ( !m_oldBitmap )
134 {
135 m_oldBitmap = hBmp;
136 }
137 }
138
139 void wxMemoryDCImpl::DoGetSize(int *width, int *height) const
140 {
141 if ( m_selectedBitmap.IsOk() )
142 {
143 *width = m_selectedBitmap.GetWidth();
144 *height = m_selectedBitmap.GetHeight();
145 }
146 else
147 {
148 *width = 0;
149 *height = 0;
150 }
151 }
152
153 // the rest of this file deals with drawing rectangles workaround, disabled by
154 // default
155
156 #define wxUSE_MEMORY_DC_DRAW_RECTANGLE 0
157
158 #if wxUSE_MEMORY_DC_DRAW_RECTANGLE
159
160 // For some reason, drawing a rectangle on a memory DC has problems.
161 // Use this substitute if we can.
162 static void wxDrawRectangle(wxDC& dc, wxCoord x, wxCoord y, wxCoord width, wxCoord height)
163 {
164 wxBrush brush(dc.GetBrush());
165 wxPen pen(dc.GetPen());
166 if (brush.IsOk() && brush.GetStyle() != wxTRANSPARENT)
167 {
168 HBRUSH hBrush = (HBRUSH) brush.GetResourceHandle() ;
169 if (hBrush)
170 {
171 RECT rect;
172 rect.left = x; rect.top = y;
173 rect.right = x + width - 1;
174 rect.bottom = y + height - 1;
175 ::FillRect((HDC) dc.GetHDC(), &rect, hBrush);
176 }
177 }
178 width --; height --;
179 if (pen.IsOk() && pen.GetStyle() != wxTRANSPARENT)
180 {
181 dc.DrawLine(x, y, x + width, y);
182 dc.DrawLine(x, y, x, y + height);
183 dc.DrawLine(x, y+height, x+width, y + height);
184 dc.DrawLine(x+width, y+height, x+width, y);
185 }
186 }
187
188 #endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
189
190 void wxMemoryDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
191 {
192 // Set this to 1 to work around an apparent video driver bug
193 // (visible with e.g. 70x70 rectangle on a memory DC; see Drawing sample)
194 #if wxUSE_MEMORY_DC_DRAW_RECTANGLE
195 if (m_brush.IsOk() && m_pen.IsOk() &&
196 (m_brush.GetStyle() == wxSOLID || m_brush.GetStyle() == wxTRANSPARENT) &&
197 (m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT) &&
198 (GetLogicalFunction() == wxCOPY))
199 {
200 wxDrawRectangle(* this, x, y, width, height);
201 }
202 else
203 #endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
204 {
205 wxMSWDCImpl::DoDrawRectangle(x, y, width, height);
206 }
207 }