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///////////////////////////////////////////////////////////////////////////////
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// Name: src/generic/caret.cpp
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// Purpose: generic wxCaret class implementation
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// Author: Vadim Zeitlin (original code by Robert Roebling)
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// RCS-ID: $Id: caret.cpp 67254 2011-03-20 00:14:35Z DS $
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// Copyright: (c) wxWidgets team
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// ============================================================================
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#include "wx/window.h"
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#include "wx/dcclient.h"
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#include "wx/dcmemory.h"
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// ----------------------------------------------------------------------------
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// global variables for this module
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// ----------------------------------------------------------------------------
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// the blink time (common to all carets for MSW compatibility)
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static int gs_blinkTime = 500; // in milliseconds
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// ============================================================================
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// ============================================================================
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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wxCaretTimer::wxCaretTimer(wxCaret *caret)
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void wxCaretTimer::Notify()
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void wxCaret::OnTimer()
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// don't blink the caret when we don't have the focus
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// ----------------------------------------------------------------------------
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// wxCaret static functions and data
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// ----------------------------------------------------------------------------
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int wxCaretBase::GetBlinkTime()
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void wxCaretBase::SetBlinkTime(int milliseconds)
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gs_blinkTime = milliseconds;
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// ----------------------------------------------------------------------------
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// initialization and destruction
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// ----------------------------------------------------------------------------
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void wxCaret::InitGeneric()
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#ifndef wxHAS_CARET_USING_OVERLAYS
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m_bmpUnderCaret.Create(m_width, m_height);
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if ( m_timer.IsRunning() )
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// ----------------------------------------------------------------------------
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// showing/hiding/moving the caret (base class interface)
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// ----------------------------------------------------------------------------
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void wxCaret::DoShow()
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int blinkTime = GetBlinkTime();
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m_timer.Start(blinkTime);
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void wxCaret::DoHide()
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void wxCaret::DoMove()
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#ifdef wxHAS_CARET_USING_OVERLAYS
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// hide it right now and it will be shown the next time it blinks
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// but if the caret is not blinking, we should blink it back into
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// visibility manually
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if ( !m_timer.IsRunning() )
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//else: will be shown at the correct location when it is shown
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void wxCaret::DoSize()
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int countVisible = m_countVisible;
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if (countVisible > 0)
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#ifdef wxHAS_CARET_USING_OVERLAYS
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// Change bitmap size
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m_bmpUnderCaret = wxBitmap(m_width, m_height);
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if (countVisible > 0)
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m_countVisible = countVisible;
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// ----------------------------------------------------------------------------
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// handling the focus
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// ----------------------------------------------------------------------------
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void wxCaret::OnSetFocus()
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void wxCaret::OnKillFocus()
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// the caret must be shown - otherwise, if it is hidden now, it will
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// stay so until the focus doesn't return because it won't blink any
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// hide it first if it isn't hidden ...
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// .. and show it in the new style
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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void wxCaret::Blink()
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m_blinkedOut = !m_blinkedOut;
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void wxCaret::Refresh()
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wxClientDC dcWin(GetWindow());
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// this is the new code, switch to 0 if this gives problems
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#ifdef wxHAS_CARET_USING_OVERLAYS
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wxDCOverlay dcOverlay( m_overlay, &dcWin, m_x, m_y, m_width , m_height );
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DoDraw( &dcWin, GetWindow() );
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dcMem.SelectObject(m_bmpUnderCaret);
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// restore the old image
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dcWin.Blit(m_xOld, m_yOld, m_width, m_height,
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if ( m_xOld == -1 && m_yOld == -1 )
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// save the part we're going to overdraw
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dcMem.Blit(0, 0, m_width, m_height,
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//else: we already saved the image below the caret, don't do it any
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// and draw the caret there
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DoDraw(&dcWin, GetWindow());
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void wxCaret::DoDraw(wxDC *dc, wxWindow* win)
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wxPen pen(*wxBLACK_PEN);
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wxBrush brush(*wxBLACK_BRUSH);
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wxColour backgroundColour(win->GetBackgroundColour());
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if (backgroundColour.Red() < 100 &&
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backgroundColour.Green() < 100 &&
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backgroundColour.Blue() < 100)
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brush = *wxWHITE_BRUSH;
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dc->SetBrush(m_hasFocus ? brush : *wxTRANSPARENT_BRUSH);
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// VZ: unfortunately, the rectangle comes out a pixel smaller when this is
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// done under wxGTK - no idea why
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//dc->SetLogicalFunction(wxINVERT);
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dc->DrawRectangle(m_x, m_y, m_width, m_height);
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#endif // wxUSE_CARET