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1 ///////////////////////////////////////////////////////////////////////////////
2 // Name: generic/caret.cpp
3 // Purpose: generic wxCaret class implementation
4 // Author: Vadim Zeitlin (original code by Robert Roebling)
5 // Modified by:
6 // Created: 25.05.99
7 // RCS-ID: $Id$
8 // Copyright: (c) wxWindows team
9 // Licence: wxWindows licence
10 ///////////////////////////////////////////////////////////////////////////////
11
12 // ============================================================================
13 // declarations
14 // ============================================================================
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 #ifdef __GNUG__
21 #pragma implementation "caret.h"
22 #endif
23
24 // For compilers that support precompilation, includes "wx.h".
25 #include "wx/wxprec.h"
26
27 #ifdef __BORLANDC__
28 #pragma hdrstop
29 #endif
30
31 #if wxUSE_CARET
32
33 #ifndef WX_PRECOMP
34 #include "wx/window.h"
35 #include "wx/dcclient.h"
36 #include "wx/dcmemory.h"
37 #endif //WX_PRECOMP
38
39 #include "wx/caret.h"
40
41 // ----------------------------------------------------------------------------
42 // global variables for this module
43 // ----------------------------------------------------------------------------
44
45 // the blink time (common to all carets for MSW compatibility)
46 static int gs_blinkTime = 500; // in milliseconds
47
48 // ============================================================================
49 // implementation
50 // ============================================================================
51
52 // ----------------------------------------------------------------------------
53 // timer stuff
54 // ----------------------------------------------------------------------------
55
56 wxCaretTimer::wxCaretTimer(wxCaret *caret)
57 {
58 m_caret = caret;
59 }
60
61 void wxCaretTimer::Notify()
62 {
63 m_caret->OnTimer();
64 }
65
66 void wxCaret::OnTimer()
67 {
68 // don't blink the caret when we don't have the focus
69 if ( m_hasFocus )
70 Blink();
71 }
72
73 // ----------------------------------------------------------------------------
74 // wxCaret static functions and data
75 // ----------------------------------------------------------------------------
76
77 int wxCaretBase::GetBlinkTime()
78 {
79 return gs_blinkTime;
80 }
81
82 void wxCaretBase::SetBlinkTime(int milliseconds)
83 {
84 gs_blinkTime = milliseconds;
85 }
86
87 // ----------------------------------------------------------------------------
88 // initialization and destruction
89 // ----------------------------------------------------------------------------
90
91 void wxCaret::InitGeneric()
92 {
93 m_hasFocus = TRUE;
94 m_blinkedOut = FALSE;
95
96 m_xOld =
97 m_yOld = -1;
98 m_bmpUnderCaret.Create(m_width, m_height);
99 }
100
101 wxCaret::~wxCaret()
102 {
103 if ( IsVisible() )
104 {
105 // stop blinking
106 if ( m_timer.IsRunning() )
107 m_timer.Stop();
108 }
109 }
110
111 // ----------------------------------------------------------------------------
112 // showing/hiding/moving the caret (base class interface)
113 // ----------------------------------------------------------------------------
114
115 void wxCaret::DoShow()
116 {
117 int blinkTime = GetBlinkTime();
118 if ( blinkTime )
119 m_timer.Start(blinkTime);
120
121 m_blinkedOut = TRUE;
122 Blink();
123 }
124
125 void wxCaret::DoHide()
126 {
127 m_timer.Stop();
128
129 if ( !m_blinkedOut )
130 {
131 Blink();
132 }
133 }
134
135 void wxCaret::DoMove()
136 {
137 if ( IsVisible() )
138 {
139 if ( !m_blinkedOut )
140 {
141 // hide it right now and it will be shown the next time it blinks
142 Blink();
143
144 // but if the caret is not blinking, we should blink it back into
145 // visibility manually
146 if ( !m_timer.IsRunning() )
147 Blink();
148 }
149 }
150 //else: will be shown at the correct location when it is shown
151 }
152
153 // ----------------------------------------------------------------------------
154 // handling the focus
155 // ----------------------------------------------------------------------------
156
157 void wxCaret::OnSetFocus()
158 {
159 m_hasFocus = TRUE;
160
161 Refresh();
162 }
163
164 void wxCaret::OnKillFocus()
165 {
166 m_hasFocus = FALSE;
167
168 if ( IsVisible() )
169 {
170 // the caret must be shown - otherwise, if it is hidden now, it will
171 // stay so until the focus doesn't return because it won't blink any
172 // more
173
174 // hide it first if it isn't hidden ...
175 if ( !m_blinkedOut )
176 Blink();
177
178 // .. and show it in the new style
179 Blink();
180 }
181 }
182
183 // ----------------------------------------------------------------------------
184 // drawing the caret
185 // ----------------------------------------------------------------------------
186
187 void wxCaret::Blink()
188 {
189 m_blinkedOut = !m_blinkedOut;
190
191 Refresh();
192 }
193
194 void wxCaret::Refresh()
195 {
196 wxClientDC dcWin(GetWindow());
197 wxMemoryDC dcMem;
198 dcMem.SelectObject(m_bmpUnderCaret);
199 if ( m_blinkedOut )
200 {
201 // restore the old image
202 dcWin.Blit(m_xOld, m_yOld, m_width, m_height,
203 &dcMem, 0, 0);
204 m_xOld =
205 m_yOld = -1;
206 }
207 else
208 {
209 if ( m_xOld == -1 && m_yOld == -1 )
210 {
211 // save the part we're going to overdraw
212
213 int x = m_x,
214 y = m_y;
215 #if defined(__WXGTK__) && !defined(__WX_DC_BLIT_FIXED__)
216 wxPoint pt = dcWin.GetDeviceOrigin();
217 x += pt.x;
218 y += pt.y;
219 #endif // broken wxGTK wxDC::Blit
220 dcMem.Blit(0, 0, m_width, m_height,
221 &dcWin, x, y);
222
223 m_xOld = m_x;
224 m_yOld = m_y;
225 }
226 //else: we already saved the image below the caret, don't do it any
227 // more
228
229 // and draw the caret there
230 DoDraw(&dcWin);
231 }
232 }
233
234 void wxCaret::DoDraw(wxDC *dc)
235 {
236 dc->SetPen( *wxBLACK_PEN );
237
238 dc->SetBrush(*(m_hasFocus ? wxBLACK_BRUSH : wxTRANSPARENT_BRUSH));
239 dc->SetPen(*wxBLACK_PEN);
240
241 // VZ: unfortunately, the rectangle comes out a pixel smaller when this is
242 // done under wxGTK - no idea why
243 //dc->SetLogicalFunction(wxINVERT);
244
245 dc->DrawRectangle(m_x, m_y, m_width, m_height);
246 }
247
248 #endif // wxUSE_CARET