src/common/mousemanager.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/mousemanager.cpp
   3 // Purpose:     implementation of wxMouseEventsManager class
   4 // Author:      Vadim Zeitlin
   5 // Created:     2009-04-21
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27 #endif // WX_PRECOMP
  28
  29 #include "wx/mousemanager.h"
  30
  31 // ----------------------------------------------------------------------------
  32 // event tables
  33 // ----------------------------------------------------------------------------
  34
  35 BEGIN_EVENT_TABLE(wxMouseEventsManager, wxEvtHandler)
  36     EVT_MOUSE_CAPTURE_LOST(wxMouseEventsManager::OnCaptureLost)
  37     EVT_LEFT_DOWN(wxMouseEventsManager::OnLeftDown)
  38     EVT_LEFT_UP(wxMouseEventsManager::OnLeftUp)
  39     EVT_MOTION(wxMouseEventsManager::OnMove)
  40 END_EVENT_TABLE()
  41
  42 // ============================================================================
  43 // wxMouseEventsManager implementation
  44 // ============================================================================
  45
  46 wxMouseEventsManager::wxMouseEventsManager(wxWindow *win)
  47     : m_win(win)
  48 {
  49     m_state = State_Normal;
  50     m_item = wxNOT_FOUND;
  51
  52     win->PushEventHandler(this);
  53 }
  54
  55 wxMouseEventsManager::~wxMouseEventsManager()
  56 {
  57     m_win->RemoveEventHandler(this);
  58 }
  59
  60 void wxMouseEventsManager::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
  61 {
  62     switch ( m_state )
  63     {
  64         case State_Normal:
  65             wxFAIL_MSG( "mouse shouldn't be captured in normal state" );
  66             break;
  67
  68         case State_Pressed:
  69             MouseClickCancelled(m_item);
  70             break;
  71
  72         case State_Dragging:
  73             MouseDragCancelled(m_item);
  74             break;
  75     }
  76
  77     m_state = State_Normal;
  78     m_item = wxNOT_FOUND;
  79 }
  80
  81 void wxMouseEventsManager::OnLeftDown(wxMouseEvent& event)
  82 {
  83     wxASSERT_MSG( m_state == State_Normal,
  84                   "state hasn't been reset to normal somehow" );
  85
  86     m_posLast = event.GetPosition();
  87     m_item = MouseHitTest(m_posLast);
  88     if ( m_item == wxNOT_FOUND )
  89     {
  90         event.Skip();
  91         return;
  92     }
  93
  94     m_state = State_Pressed;
  95     m_win->CaptureMouse();
  96     MouseClickBegin(m_item);
  97 }
  98
  99 void wxMouseEventsManager::OnLeftUp(wxMouseEvent& event)
 100 {
 101     switch ( m_state )
 102     {
 103         case State_Normal:
 104             // ignore it, the mouse hasn't been pressed over any item initially
 105             // so releasing it shouldn't do anything
 106             event.Skip();
 107
 108             // skip releasing the capture below
 109             return;
 110
 111         case State_Pressed:
 112             if ( MouseHitTest(event.GetPosition()) == m_item )
 113             {
 114                 // mouse released over the same item, so it was a click
 115                 MouseClicked(m_item);
 116             }
 117             break;
 118
 119         case State_Dragging:
 120             MouseDragEnd(m_item, event.GetPosition());
 121             break;
 122     }
 123
 124     m_state = State_Normal;
 125     m_item = wxNOT_FOUND;
 126     m_win->ReleaseMouse();
 127 }
 128
 129 void wxMouseEventsManager::OnMove(wxMouseEvent& event)
 130 {
 131     switch ( m_state )
 132     {
 133         case State_Normal:
 134             event.Skip();
 135             break;
 136
 137         case State_Pressed:
 138             wxASSERT_MSG( event.LeftIsDown(),
 139                           "should have detected mouse being released" );
 140
 141             {
 142                 // it's probably a bad idea to query the system for these
 143                 // values every time the mouse is moved so cache them on the
 144                 // assumption that they don't change -- which is wrong, of
 145                 // course, the user can change them but it doesn't happen often
 146                 static const int
 147                     dragMinX = wxSystemSettings::GetMetric(wxSYS_DRAG_X);
 148                 static const int
 149                     dragMinY = wxSystemSettings::GetMetric(wxSYS_DRAG_Y);
 150
 151                 const wxPoint& pos = event.GetPosition();
 152                 const wxPoint ofs = pos - m_posLast;
 153                 if ( abs(ofs.x) > dragMinX || abs(ofs.y) > dragMinY )
 154                 {
 155                     // the mouse left the rectangle inside which its movements
 156                     // are considered to be too small to constitute a start of
 157                     // drag operation, do [attempt to] start it now
 158                     if ( MouseDragBegin(m_item, pos) )
 159                     {
 160                         m_state = State_Dragging;
 161                     }
 162                 }
 163                 else // still didn't move far enough away
 164                 {
 165                     event.Skip();
 166                 }
 167             }
 168             break;
 169
 170         case State_Dragging:
 171             m_posLast = event.GetPosition();
 172             MouseDragging(m_item, m_posLast);
 173             break;
 174     }
 175 }
 176