src/msw/caret.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/caret.cpp
   3 // Purpose:     MSW implementation of wxCaret
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     23.05.99
   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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #ifndef WX_PRECOMP
  32     #include "wx/window.h"
  33     #include "wx/log.h"
  34 #endif // WX_PRECOMP
  35
  36 #include "wx/caret.h"
  37
  38 #if wxUSE_CARET
  39
  40 #include "wx/msw/private.h"
  41
  42 // ---------------------------------------------------------------------------
  43 // macros
  44 // ---------------------------------------------------------------------------
  45
  46 #define CALL_CARET_API(api, args)   \
  47         if ( !api args )                \
  48             wxLogLastError(_T(#api))
  49
  50 // ===========================================================================
  51 // implementation
  52 // ===========================================================================
  53
  54 // ---------------------------------------------------------------------------
  55 // blink time
  56 // ---------------------------------------------------------------------------
  57
  58 //static
  59 int wxCaretBase::GetBlinkTime()
  60 {
  61     int blinkTime = ::GetCaretBlinkTime();
  62     if ( !blinkTime )
  63     {
  64         wxLogLastError(wxT("GetCaretBlinkTime"));
  65     }
  66
  67     return blinkTime;
  68 }
  69
  70 //static
  71 void wxCaretBase::SetBlinkTime(int milliseconds)
  72 {
  73     CALL_CARET_API(SetCaretBlinkTime, (milliseconds));
  74 }
  75
  76 // ---------------------------------------------------------------------------
  77 // creating/destroying the caret
  78 // ---------------------------------------------------------------------------
  79
  80 bool wxCaret::MSWCreateCaret()
  81 {
  82     wxASSERT_MSG( GetWindow(), wxT("caret without window cannot be created") );
  83     wxASSERT_MSG( IsOk(),  wxT("caret of zero size cannot be created") );
  84
  85     if ( !m_hasCaret )
  86     {
  87         CALL_CARET_API(CreateCaret, (GetWinHwnd(GetWindow()), 0,
  88                                      m_width, m_height));
  89
  90         m_hasCaret = true;
  91     }
  92
  93     return m_hasCaret;
  94 }
  95
  96 void wxCaret::OnSetFocus()
  97 {
  98     if ( m_countVisible > 0 )
  99     {
 100         if ( MSWCreateCaret() )
 101         {
 102             // the caret was recreated but it doesn't remember its position and
 103             // it's not shown
 104
 105             DoMove();
 106             DoShow();
 107         }
 108     }
 109     //else: caret is invisible, don't waste time creating it
 110 }
 111
 112 void wxCaret::OnKillFocus()
 113 {
 114     if ( m_hasCaret )
 115     {
 116         m_hasCaret = false;
 117
 118         CALL_CARET_API(DestroyCaret, ());
 119     }
 120 }
 121
 122 // ---------------------------------------------------------------------------
 123 // showing/hiding the caret
 124 // ---------------------------------------------------------------------------
 125
 126 void wxCaret::DoShow()
 127 {
 128     wxASSERT_MSG( GetWindow(), wxT("caret without window cannot be shown") );
 129     wxASSERT_MSG( IsOk(), wxT("caret of zero size cannot be shown") );
 130
 131     // we might not have created the caret yet if we had got the focus first
 132     // and the caret was shown later - so do it now if we have the focus but
 133     // not the caret
 134     if ( !m_hasCaret && (wxWindow::FindFocus() == GetWindow()) )
 135     {
 136         if ( MSWCreateCaret() )
 137         {
 138             DoMove();
 139         }
 140     }
 141
 142     if ( m_hasCaret )
 143     {
 144         CALL_CARET_API(ShowCaret, (GetWinHwnd(GetWindow())));
 145     }
 146     //else: will be shown when we get the focus
 147 }
 148
 149 void wxCaret::DoHide()
 150 {
 151     if ( m_hasCaret )
 152     {
 153         CALL_CARET_API(HideCaret, (GetWinHwnd(GetWindow())));
 154     }
 155 }
 156
 157 // ---------------------------------------------------------------------------
 158 // moving the caret
 159 // ---------------------------------------------------------------------------
 160
 161 void wxCaret::DoMove()
 162 {
 163     if ( m_hasCaret )
 164     {
 165         wxASSERT_MSG( wxWindow::FindFocus() == GetWindow(),
 166                       wxT("how did we lose focus?") );
 167
 168         // for compatibility with the generic version, the coordinates are
 169         // client ones
 170         wxPoint pt = GetWindow()->GetClientAreaOrigin();
 171         CALL_CARET_API(SetCaretPos, (m_x + pt.x, m_y + pt.y));
 172     }
 173     //else: we don't have caret right now, nothing to do (this does happen)
 174 }
 175
 176
 177 // ---------------------------------------------------------------------------
 178 // resizing the caret
 179 // ---------------------------------------------------------------------------
 180
 181 void wxCaret::DoSize()
 182 {
 183     if ( m_hasCaret )
 184     {
 185         m_hasCaret = false;
 186         CALL_CARET_API(DestroyCaret, ());
 187         MSWCreateCaret();
 188         OnSetFocus();
 189     }
 190 }
 191
 192 #endif