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) 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 #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 // under Win16 the caret APIs are void but under Win32 they may return an
  47 // error code which we want to check - this macro does just this
  48 #ifdef __WIN16__
  49     #define CALL_CARET_API(api, args)   api args
  50 #else // Win32
  51     #define CALL_CARET_API(api, args)   \
  52         if ( !api args )                \
  53             wxLogLastError(_T(#api))
  54 #endif // Win16/32
  55
  56 // ===========================================================================
  57 // implementation
  58 // ===========================================================================
  59
  60 // ---------------------------------------------------------------------------
  61 // blink time
  62 // ---------------------------------------------------------------------------
  63
  64 //static
  65 int wxCaretBase::GetBlinkTime()
  66 {
  67     int blinkTime = ::GetCaretBlinkTime();
  68     if ( !blinkTime )
  69     {
  70         wxLogLastError(wxT("GetCaretBlinkTime"));
  71     }
  72
  73     return blinkTime;
  74 }
  75
  76 //static
  77 void wxCaretBase::SetBlinkTime(int milliseconds)
  78 {
  79     CALL_CARET_API(SetCaretBlinkTime, (milliseconds));
  80 }
  81
  82 // ---------------------------------------------------------------------------
  83 // creating/destroying the caret
  84 // ---------------------------------------------------------------------------
  85
  86 bool wxCaret::MSWCreateCaret()
  87 {
  88     wxASSERT_MSG( GetWindow(), wxT("caret without window cannot be created") );
  89     wxASSERT_MSG( IsOk(),  wxT("caret of zero size cannot be created") );
  90
  91     if ( !m_hasCaret )
  92     {
  93         CALL_CARET_API(CreateCaret, (GetWinHwnd(GetWindow()), 0,
  94                                      m_width, m_height));
  95
  96         m_hasCaret = TRUE;
  97     }
  98
  99     return m_hasCaret;
 100 }
 101
 102 void wxCaret::OnSetFocus()
 103 {
 104     if ( m_countVisible > 0 )
 105     {
 106         if ( MSWCreateCaret() )
 107         {
 108             // the caret was recreated but it doesn't remember its position and
 109             // it's not shown
 110
 111             DoMove();
 112             DoShow();
 113         }
 114     }
 115     //else: caret is invisible, don't waste time creating it
 116 }
 117
 118 void wxCaret::OnKillFocus()
 119 {
 120     if ( m_hasCaret )
 121     {
 122         m_hasCaret = FALSE;
 123
 124         CALL_CARET_API(DestroyCaret, ());
 125     }
 126 }
 127
 128 // ---------------------------------------------------------------------------
 129 // showing/hiding the caret
 130 // ---------------------------------------------------------------------------
 131
 132 void wxCaret::DoShow()
 133 {
 134     wxASSERT_MSG( GetWindow(), wxT("caret without window cannot be shown") );
 135     wxASSERT_MSG( IsOk(), wxT("caret of zero size cannot be shown") );
 136
 137     // we might not have created the caret yet if we had got the focus first
 138     // and the caret was shown later - so do it now if we have the focus but
 139     // not the caret
 140     if ( !m_hasCaret && (wxWindow::FindFocus() == GetWindow()) )
 141     {
 142         if ( MSWCreateCaret() )
 143         {
 144             DoMove();
 145         }
 146     }
 147
 148     if ( m_hasCaret )
 149     {
 150         CALL_CARET_API(ShowCaret, (GetWinHwnd(GetWindow())));
 151     }
 152     //else: will be shown when we get the focus
 153 }
 154
 155 void wxCaret::DoHide()
 156 {
 157     if ( m_hasCaret )
 158     {
 159         CALL_CARET_API(HideCaret, (GetWinHwnd(GetWindow())));
 160     }
 161 }
 162
 163 // ---------------------------------------------------------------------------
 164 // moving the caret
 165 // ---------------------------------------------------------------------------
 166
 167 void wxCaret::DoMove()
 168 {
 169     if ( m_hasCaret )
 170     {
 171         wxASSERT_MSG( wxWindow::FindFocus() == GetWindow(),
 172                       wxT("how did we lose focus?") );
 173
 174         // for compatibility with the generic version, the coordinates are
 175         // client ones
 176         wxPoint pt = GetWindow()->GetClientAreaOrigin();
 177         CALL_CARET_API(SetCaretPos, (m_x + pt.x, m_y + pt.y));
 178     }
 179     //else: we don't have caret right now, nothing to do (this does happen)
 180 }
 181
 182
 183 // ---------------------------------------------------------------------------
 184 // resizing the caret
 185 // ---------------------------------------------------------------------------
 186
 187 void wxCaret::DoSize()
 188 {
 189     if ( m_hasCaret )
 190     {
 191         m_hasCaret = FALSE;
 192         CALL_CARET_API(DestroyCaret, ());
 193         MSWCreateCaret();
 194         OnSetFocus();
 195     }
 196 }
 197
 198 #endif