src/generic/caret.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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) wxWidgets team
   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 #if wxUSE_CARET
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/window.h"
  31     #include "wx/dcclient.h"
  32     #include "wx/dcmemory.h"
  33 #endif //WX_PRECOMP
  34
  35 #include "wx/caret.h"
  36
  37 // ----------------------------------------------------------------------------
  38 // global variables for this module
  39 // ----------------------------------------------------------------------------
  40
  41 // the blink time (common to all carets for MSW compatibility)
  42 static int gs_blinkTime = 500;  // in milliseconds
  43
  44 // ============================================================================
  45 // implementation
  46 // ============================================================================
  47
  48 // ----------------------------------------------------------------------------
  49 // timer stuff
  50 // ----------------------------------------------------------------------------
  51
  52 wxCaretTimer::wxCaretTimer(wxCaret *caret)
  53 {
  54     m_caret = caret;
  55 }
  56
  57 void wxCaretTimer::Notify()
  58 {
  59     m_caret->OnTimer();
  60 }
  61
  62 void wxCaret::OnTimer()
  63 {
  64     // don't blink the caret when we don't have the focus
  65     if ( m_hasFocus )
  66         Blink();
  67 }
  68
  69 // ----------------------------------------------------------------------------
  70 // wxCaret static functions and data
  71 // ----------------------------------------------------------------------------
  72
  73 int wxCaretBase::GetBlinkTime()
  74 {
  75     return gs_blinkTime;
  76 }
  77
  78 void wxCaretBase::SetBlinkTime(int milliseconds)
  79 {
  80     gs_blinkTime = milliseconds;
  81 }
  82
  83 // ----------------------------------------------------------------------------
  84 // initialization and destruction
  85 // ----------------------------------------------------------------------------
  86
  87 void wxCaret::InitGeneric()
  88 {
  89     m_hasFocus = true;
  90     m_blinkedOut = true;
  91 #ifndef wxHAS_CARET_USING_OVERLAYS
  92     m_xOld =
  93     m_yOld = -1;
  94     m_bmpUnderCaret.Create(m_width, m_height);
  95 #endif
  96 }
  97
  98 wxCaret::~wxCaret()
  99 {
 100     if ( IsVisible() )
 101     {
 102         // stop blinking
 103         if ( m_timer.IsRunning() )
 104             m_timer.Stop();
 105     }
 106 }
 107
 108 // ----------------------------------------------------------------------------
 109 // showing/hiding/moving the caret (base class interface)
 110 // ----------------------------------------------------------------------------
 111
 112 void wxCaret::DoShow()
 113 {
 114     int blinkTime = GetBlinkTime();
 115     if ( blinkTime )
 116         m_timer.Start(blinkTime);
 117
 118     if ( m_blinkedOut )
 119         Blink();
 120 }
 121
 122 void wxCaret::DoHide()
 123 {
 124     m_timer.Stop();
 125
 126     if ( !m_blinkedOut )
 127     {
 128         Blink();
 129     }
 130 }
 131
 132 void wxCaret::DoMove()
 133 {
 134 #ifdef wxHAS_CARET_USING_OVERLAYS
 135     m_overlay.Reset();
 136 #endif
 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 void wxCaret::DoSize()
 154 {
 155     int countVisible = m_countVisible;
 156     if (countVisible > 0)
 157     {
 158         m_countVisible = 0;
 159         DoHide();
 160     }
 161 #ifdef wxHAS_CARET_USING_OVERLAYS
 162     m_overlay.Reset();
 163 #else
 164     // Change bitmap size
 165     m_bmpUnderCaret = wxBitmap(m_width, m_height);
 166 #endif
 167     if (countVisible > 0)
 168     {
 169         m_countVisible = countVisible;
 170         DoShow();
 171     }
 172 }
 173
 174 // ----------------------------------------------------------------------------
 175 // handling the focus
 176 // ----------------------------------------------------------------------------
 177
 178 void wxCaret::OnSetFocus()
 179 {
 180     m_hasFocus = true;
 181
 182     if ( IsVisible() )
 183         Refresh();
 184 }
 185
 186 void wxCaret::OnKillFocus()
 187 {
 188     m_hasFocus = false;
 189
 190     if ( IsVisible() )
 191     {
 192         // the caret must be shown - otherwise, if it is hidden now, it will
 193         // stay so until the focus doesn't return because it won't blink any
 194         // more
 195
 196         // hide it first if it isn't hidden ...
 197         if ( !m_blinkedOut )
 198             Blink();
 199
 200         // .. and show it in the new style
 201         Blink();
 202     }
 203 }
 204
 205 // ----------------------------------------------------------------------------
 206 // drawing the caret
 207 // ----------------------------------------------------------------------------
 208
 209 void wxCaret::Blink()
 210 {
 211     m_blinkedOut = !m_blinkedOut;
 212
 213     Refresh();
 214 }
 215
 216 void wxCaret::Refresh()
 217 {
 218     wxClientDC dcWin(GetWindow());
 219 // this is the new code, switch to 0 if this gives problems
 220 #ifdef wxHAS_CARET_USING_OVERLAYS
 221     wxDCOverlay dcOverlay( m_overlay, &dcWin, m_x, m_y, m_width , m_height );
 222     if ( m_blinkedOut )
 223     {
 224         dcOverlay.Clear();
 225     }
 226     else
 227     {
 228         DoDraw( &dcWin, GetWindow() );
 229     }
 230 #else
 231     wxMemoryDC dcMem;
 232     dcMem.SelectObject(m_bmpUnderCaret);
 233     if ( m_blinkedOut )
 234     {
 235         // restore the old image
 236         dcWin.Blit(m_xOld, m_yOld, m_width, m_height,
 237                    &dcMem, 0, 0);
 238         m_xOld =
 239         m_yOld = -1;
 240     }
 241     else
 242     {
 243         if ( m_xOld == -1 && m_yOld == -1 )
 244         {
 245             // save the part we're going to overdraw
 246             dcMem.Blit(0, 0, m_width, m_height,
 247                        &dcWin, m_x, m_y);
 248
 249             m_xOld = m_x;
 250             m_yOld = m_y;
 251         }
 252         //else: we already saved the image below the caret, don't do it any
 253         //      more
 254
 255         // and draw the caret there
 256         DoDraw(&dcWin, GetWindow());
 257     }
 258 #endif
 259 }
 260
 261 void wxCaret::DoDraw(wxDC *dc, wxWindow* win)
 262 {
 263     wxPen pen(*wxBLACK_PEN);
 264     wxBrush brush(*wxBLACK_BRUSH);
 265     if (win)
 266     {
 267         wxColour backgroundColour(win->GetBackgroundColour());
 268         if (backgroundColour.Red() < 100 &&
 269             backgroundColour.Green() < 100 &&
 270             backgroundColour.Blue() < 100)
 271         {
 272             pen = *wxWHITE_PEN;
 273             brush = *wxWHITE_BRUSH;
 274         }
 275     }
 276     dc->SetPen( pen );
 277     dc->SetBrush(m_hasFocus ? brush : *wxTRANSPARENT_BRUSH);
 278
 279     // VZ: unfortunately, the rectangle comes out a pixel smaller when this is
 280     //     done under wxGTK - no idea why
 281     //dc->SetLogicalFunction(wxINVERT);
 282
 283     dc->DrawRectangle(m_x, m_y, m_width, m_height);
 284 }
 285
 286 #endif // wxUSE_CARET