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 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/window.h"
  29     #include "wx/log.h"
  30 #endif // WX_PRECOMP
  31
  32 #include "wx/caret.h"
  33
  34 #if wxUSE_CARET
  35
  36 #include "wx/msw/private.h"
  37
  38 // ---------------------------------------------------------------------------
  39 // macros
  40 // ---------------------------------------------------------------------------
  41
  42 #define CALL_CARET_API(api, args) \
  43         if ( !api args ) \
  44         { \
  45             wxLogLastError(wxT(#api)); \
  46         }
  47
  48 // ===========================================================================
  49 // implementation
  50 // ===========================================================================
  51
  52 // ---------------------------------------------------------------------------
  53 // blink time
  54 // ---------------------------------------------------------------------------
  55
  56 //static
  57 int wxCaretBase::GetBlinkTime()
  58 {
  59     int blinkTime = ::GetCaretBlinkTime();
  60     if ( !blinkTime )
  61     {
  62         wxLogLastError(wxT("GetCaretBlinkTime"));
  63     }
  64
  65     return blinkTime;
  66 }
  67
  68 //static
  69 void wxCaretBase::SetBlinkTime(int milliseconds)
  70 {
  71     CALL_CARET_API(SetCaretBlinkTime, (milliseconds));
  72 }
  73
  74 // ---------------------------------------------------------------------------
  75 // creating/destroying the caret
  76 // ---------------------------------------------------------------------------
  77
  78 bool wxCaret::MSWCreateCaret()
  79 {
  80     wxASSERT_MSG( GetWindow(), wxT("caret without window cannot be created") );
  81     wxASSERT_MSG( IsOk(),  wxT("caret of zero size cannot be created") );
  82
  83     if ( !m_hasCaret )
  84     {
  85         CALL_CARET_API(CreateCaret, (GetWinHwnd(GetWindow()), 0,
  86                                      m_width, m_height));
  87
  88         m_hasCaret = true;
  89     }
  90
  91     return m_hasCaret;
  92 }
  93
  94 void wxCaret::OnSetFocus()
  95 {
  96     if ( m_countVisible > 0 )
  97     {
  98         if ( MSWCreateCaret() )
  99         {
 100             // the caret was recreated but it doesn't remember its position and
 101             // it's not shown
 102
 103             DoMove();
 104             DoShow();
 105         }
 106     }
 107     //else: caret is invisible, don't waste time creating it
 108 }
 109
 110 void wxCaret::OnKillFocus()
 111 {
 112     if ( m_hasCaret )
 113     {
 114         m_hasCaret = false;
 115
 116         CALL_CARET_API(DestroyCaret, ());
 117     }
 118 }
 119
 120 // ---------------------------------------------------------------------------
 121 // showing/hiding the caret
 122 // ---------------------------------------------------------------------------
 123
 124 void wxCaret::DoShow()
 125 {
 126     wxASSERT_MSG( GetWindow(), wxT("caret without window cannot be shown") );
 127     wxASSERT_MSG( IsOk(), wxT("caret of zero size cannot be shown") );
 128
 129     // we might not have created the caret yet if we had got the focus first
 130     // and the caret was shown later - so do it now if we have the focus but
 131     // not the caret
 132     if ( !m_hasCaret && (wxWindow::FindFocus() == GetWindow()) )
 133     {
 134         if ( MSWCreateCaret() )
 135         {
 136             DoMove();
 137         }
 138     }
 139
 140     if ( m_hasCaret )
 141     {
 142         CALL_CARET_API(ShowCaret, (GetWinHwnd(GetWindow())));
 143     }
 144     //else: will be shown when we get the focus
 145 }
 146
 147 void wxCaret::DoHide()
 148 {
 149     if ( m_hasCaret )
 150     {
 151         CALL_CARET_API(HideCaret, (GetWinHwnd(GetWindow())));
 152     }
 153 }
 154
 155 // ---------------------------------------------------------------------------
 156 // moving the caret
 157 // ---------------------------------------------------------------------------
 158
 159 void wxCaret::DoMove()
 160 {
 161     if ( m_hasCaret )
 162     {
 163         wxASSERT_MSG( wxWindow::FindFocus() == GetWindow(),
 164                       wxT("how did we lose focus?") );
 165
 166         // for compatibility with the generic version, the coordinates are
 167         // client ones
 168         wxPoint pt = GetWindow()->GetClientAreaOrigin();
 169         CALL_CARET_API(SetCaretPos, (m_x + pt.x, m_y + pt.y));
 170     }
 171     //else: we don't have caret right now, nothing to do (this does happen)
 172 }
 173
 174
 175 // ---------------------------------------------------------------------------
 176 // resizing the caret
 177 // ---------------------------------------------------------------------------
 178
 179 void wxCaret::DoSize()
 180 {
 181     if ( m_hasCaret )
 182     {
 183         m_hasCaret = false;
 184         CALL_CARET_API(DestroyCaret, ());
 185         MSWCreateCaret();
 186         OnSetFocus();
 187     }
 188 }
 189
 190 #endif