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 #include "wx/msw/private.h"
  39
  40 // ===========================================================================
  41 // implementation
  42 // ===========================================================================
  43
  44 // ---------------------------------------------------------------------------
  45 // blink time
  46 // ---------------------------------------------------------------------------
  47
  48 //static
  49 int wxCaretBase::GetBlinkTime()
  50 {
  51     int blinkTime = ::GetCaretBlinkTime();
  52     if ( !blinkTime )
  53     {
  54         wxLogLastError("GetCaretBlinkTime");
  55     }
  56
  57     return blinkTime;
  58 }
  59
  60 //static
  61 void wxCaretBase::SetBlinkTime(int milliseconds)
  62 {
  63     if ( !::SetCaretBlinkTime(milliseconds) )
  64     {
  65         wxLogLastError("SetCaretBlinkTime");
  66     }
  67 }
  68
  69 // ---------------------------------------------------------------------------
  70 // creating/destroying the caret
  71 // ---------------------------------------------------------------------------
  72
  73 bool wxCaret::MSWCreateCaret()
  74 {
  75     wxASSERT_MSG( GetWindow(), "caret without window cannot be created" );
  76     wxASSERT_MSG( IsOk(),  "caret of zero size cannot be created" );
  77
  78     if ( !m_hasCaret )
  79     {
  80         if ( !::CreateCaret(GetWinHwnd(GetWindow()), 0, m_width, m_height) )
  81         {
  82             wxLogLastError("CreateCaret");
  83         }
  84         else
  85         {
  86             m_hasCaret = TRUE;
  87         }
  88     }
  89
  90     return m_hasCaret;
  91 }
  92
  93 void wxCaret::OnSetFocus()
  94 {
  95     if ( m_countVisible > 0 )
  96     {
  97         if ( MSWCreateCaret() )
  98         {
  99             // the caret was recreated but it doesn't remember its position and
 100             // it's not shown
 101
 102             DoMove();
 103             DoShow();
 104         }
 105     }
 106     //else: caret is invisible, don't waste time creating it
 107 }
 108
 109 void wxCaret::OnKillFocus()
 110 {
 111     if ( m_hasCaret )
 112     {
 113         m_hasCaret = FALSE;
 114
 115         if ( !::DestroyCaret() )
 116         {
 117             wxLogLastError("DestroyCaret");
 118         }
 119     }
 120 }
 121
 122 // ---------------------------------------------------------------------------
 123 // showing/hiding the caret
 124 // ---------------------------------------------------------------------------
 125
 126 void wxCaret::DoShow()
 127 {
 128     wxASSERT_MSG( GetWindow(), "caret without window cannot be shown" );
 129     wxASSERT_MSG( IsOk(), "caret of zero size cannot be shown" );
 130
 131     if ( !m_hasCaret )
 132     {
 133         (void)MSWCreateCaret();
 134     }
 135
 136     if ( !::ShowCaret(GetWinHwnd(GetWindow())) )
 137     {
 138         wxLogLastError("ShowCaret");
 139     }
 140 }
 141
 142 void wxCaret::DoHide()
 143 {
 144     if ( m_hasCaret )
 145     {
 146         if ( !::HideCaret(GetWinHwnd(GetWindow())) )
 147         {
 148             wxLogLastError("HideCaret");
 149         }
 150     }
 151 }
 152
 153 // ---------------------------------------------------------------------------
 154 // moving the caret
 155 // ---------------------------------------------------------------------------
 156
 157 void wxCaret::DoMove()
 158 {
 159     if ( m_hasCaret )
 160     {
 161         if ( !::SetCaretPos(m_x, m_y) )
 162         {
 163             wxLogLastError("SetCaretPos");
 164         }
 165     }
 166     //else: we don't have caret right now, nothing to do (this does happen)
 167 }