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     #include "wx/settings.h"
  28     #include "wx/window.h"
  29 #endif // WX_PRECOMP
  30
  31 #include "wx/mousemanager.h"
  32
  33 // ----------------------------------------------------------------------------
  34 // event tables
  35 // ----------------------------------------------------------------------------
  36
  37 BEGIN_EVENT_TABLE(wxMouseEventsManager, wxEvtHandler)
  38     EVT_MOUSE_CAPTURE_LOST(wxMouseEventsManager::OnCaptureLost)
  39     EVT_LEFT_DOWN(wxMouseEventsManager::OnLeftDown)
  40     EVT_LEFT_UP(wxMouseEventsManager::OnLeftUp)
  41     EVT_MOTION(wxMouseEventsManager::OnMove)
  42 END_EVENT_TABLE()
  43
  44 // ============================================================================
  45 // wxMouseEventsManager implementation
  46 // ============================================================================
  47
  48 wxMouseEventsManager::wxMouseEventsManager(wxWindow *win)
  49     : m_win(win)
  50 {
  51     m_state = State_Normal;
  52     m_item = wxNOT_FOUND;
  53
  54     win->PushEventHandler(this);
  55 }
  56
  57 wxMouseEventsManager::~wxMouseEventsManager()
  58 {
  59     m_win->RemoveEventHandler(this);
  60 }
  61
  62 void wxMouseEventsManager::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
  63 {
  64     switch ( m_state )
  65     {
  66         case State_Normal:
  67             wxFAIL_MSG( "mouse shouldn't be captured in normal state" );
  68             break;
  69
  70         case State_Pressed:
  71             MouseClickCancelled(m_item);
  72             break;
  73
  74         case State_Dragging:
  75             MouseDragCancelled(m_item);
  76             break;
  77     }
  78
  79     m_state = State_Normal;
  80     m_item = wxNOT_FOUND;
  81 }
  82
  83 void wxMouseEventsManager::OnLeftDown(wxMouseEvent& event)
  84 {
  85     wxASSERT_MSG( m_state == State_Normal,
  86                   "state hasn't been reset to normal somehow" );
  87
  88     m_posLast = event.GetPosition();
  89     m_item = MouseHitTest(m_posLast);
  90     if ( m_item == wxNOT_FOUND )
  91     {
  92         event.Skip();
  93         return;
  94     }
  95
  96     m_state = State_Pressed;
  97     m_win->CaptureMouse();
  98     MouseClickBegin(m_item);
  99 }
 100
 101 void wxMouseEventsManager::OnLeftUp(wxMouseEvent& event)
 102 {
 103     switch ( m_state )
 104     {
 105         case State_Normal:
 106             // ignore it, the mouse hasn't been pressed over any item initially
 107             // so releasing it shouldn't do anything
 108             event.Skip();
 109
 110             // skip releasing the capture below
 111             return;
 112
 113         case State_Pressed:
 114             if ( MouseHitTest(event.GetPosition()) == m_item )
 115             {
 116                 // mouse released over the same item, so it was a click
 117                 MouseClicked(m_item);
 118             }
 119             break;
 120
 121         case State_Dragging:
 122             MouseDragEnd(m_item, event.GetPosition());
 123             break;
 124     }
 125
 126     m_state = State_Normal;
 127     m_item = wxNOT_FOUND;
 128     m_win->ReleaseMouse();
 129 }
 130
 131 void wxMouseEventsManager::OnMove(wxMouseEvent& event)
 132 {
 133     switch ( m_state )
 134     {
 135         case State_Normal:
 136             event.Skip();
 137             break;
 138
 139         case State_Pressed:
 140             wxASSERT_MSG( event.LeftIsDown(),
 141                           "should have detected mouse being released" );
 142
 143             {
 144                 // it's probably a bad idea to query the system for these
 145                 // values every time the mouse is moved so cache them on the
 146                 // assumption that they don't change -- which is wrong, of
 147                 // course, the user can change them but it doesn't happen often
 148                 static const int
 149                     dragMinX = wxSystemSettings::GetMetric(wxSYS_DRAG_X);
 150                 static const int
 151                     dragMinY = wxSystemSettings::GetMetric(wxSYS_DRAG_Y);
 152
 153                 const wxPoint& pos = event.GetPosition();
 154                 const wxPoint ofs = pos - m_posLast;
 155                 if ( abs(ofs.x) > dragMinX || abs(ofs.y) > dragMinY )
 156                 {
 157                     // the mouse left the rectangle inside which its movements
 158                     // are considered to be too small to constitute a start of
 159                     // drag operation, do [attempt to] start it now
 160                     if ( MouseDragBegin(m_item, pos) )
 161                     {
 162                         m_state = State_Dragging;
 163                     }
 164                 }
 165                 else // still didn't move far enough away
 166                 {
 167                     event.Skip();
 168                 }
 169             }
 170             break;
 171
 172         case State_Dragging:
 173             m_posLast = event.GetPosition();
 174             MouseDragging(m_item, m_posLast);
 175             break;
 176     }
 177 }
 178