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 // Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // declarations
  12 // ============================================================================
  13
  14 // ----------------------------------------------------------------------------
  15 // headers
  16 // ----------------------------------------------------------------------------
  17
  18 // for compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #ifdef __BORLANDC__
  22     #pragma hdrstop
  23 #endif
  24
  25 #ifndef WX_PRECOMP
  26     #include "wx/settings.h"
  27     #include "wx/window.h"
  28 #endif // WX_PRECOMP
  29
  30 #include "wx/mousemanager.h"
  31
  32 // ----------------------------------------------------------------------------
  33 // event tables
  34 // ----------------------------------------------------------------------------
  35
  36 BEGIN_EVENT_TABLE(wxMouseEventsManager, wxEvtHandler)
  37     EVT_MOUSE_CAPTURE_LOST(wxMouseEventsManager::OnCaptureLost)
  38     EVT_LEFT_DOWN(wxMouseEventsManager::OnLeftDown)
  39     EVT_LEFT_UP(wxMouseEventsManager::OnLeftUp)
  40     EVT_MOTION(wxMouseEventsManager::OnMove)
  41 END_EVENT_TABLE()
  42
  43 // ============================================================================
  44 // wxMouseEventsManager implementation
  45 // ============================================================================
  46
  47 void wxMouseEventsManager::Init()
  48 {
  49     m_win = NULL;
  50     m_state = State_Normal;
  51     m_item = wxNOT_FOUND;
  52 }
  53
  54 bool wxMouseEventsManager::Create(wxWindow *win)
  55 {
  56     wxASSERT_MSG( !m_win, "Create() must not be called twice" );
  57
  58     m_win = win;
  59     win->PushEventHandler(this);
  60
  61     return true;
  62 }
  63
  64 wxMouseEventsManager::~wxMouseEventsManager()
  65 {
  66     if ( m_win )
  67         m_win->RemoveEventHandler(this);
  68 }
  69
  70 void wxMouseEventsManager::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
  71 {
  72     switch ( m_state )
  73     {
  74         case State_Normal:
  75             wxFAIL_MSG( "mouse shouldn't be captured in normal state" );
  76             break;
  77
  78         case State_Pressed:
  79             MouseClickCancelled(m_item);
  80             break;
  81
  82         case State_Dragging:
  83             MouseDragCancelled(m_item);
  84             break;
  85     }
  86
  87     m_state = State_Normal;
  88     m_item = wxNOT_FOUND;
  89 }
  90
  91 void wxMouseEventsManager::OnLeftDown(wxMouseEvent& event)
  92 {
  93     wxASSERT_MSG( m_state == State_Normal,
  94                   "state hasn't been reset to normal somehow" );
  95
  96     m_posLast = event.GetPosition();
  97     m_item = MouseHitTest(m_posLast);
  98     if ( m_item == wxNOT_FOUND )
  99     {
 100         event.Skip();
 101         return;
 102     }
 103
 104     m_state = State_Pressed;
 105     m_win->SetFocus();
 106     m_win->CaptureMouse();
 107     MouseClickBegin(m_item);
 108 }
 109
 110 void wxMouseEventsManager::OnLeftUp(wxMouseEvent& event)
 111 {
 112     switch ( m_state )
 113     {
 114         case State_Normal:
 115             // ignore it, the mouse hasn't been pressed over any item initially
 116             // so releasing it shouldn't do anything
 117             event.Skip();
 118
 119             // skip releasing the capture below
 120             return;
 121
 122         case State_Pressed:
 123             if ( MouseHitTest(event.GetPosition()) == m_item )
 124             {
 125                 // mouse released over the same item, so it was a click
 126                 MouseClicked(m_item);
 127             }
 128             break;
 129
 130         case State_Dragging:
 131             MouseDragEnd(m_item, event.GetPosition());
 132             break;
 133     }
 134
 135     m_state = State_Normal;
 136     m_item = wxNOT_FOUND;
 137     m_win->ReleaseMouse();
 138 }
 139
 140 void wxMouseEventsManager::OnMove(wxMouseEvent& event)
 141 {
 142     switch ( m_state )
 143     {
 144         case State_Normal:
 145             event.Skip();
 146             break;
 147
 148         case State_Pressed:
 149             wxASSERT_MSG( event.LeftIsDown(),
 150                           "should have detected mouse being released" );
 151
 152             {
 153                 // it's probably a bad idea to query the system for these
 154                 // values every time the mouse is moved so cache them on the
 155                 // assumption that they don't change -- which is wrong, of
 156                 // course, the user can change them but it doesn't happen often
 157                 static const int
 158                     dragMinX = wxSystemSettings::GetMetric(wxSYS_DRAG_X);
 159                 static const int
 160                     dragMinY = wxSystemSettings::GetMetric(wxSYS_DRAG_Y);
 161
 162                 const wxPoint& pos = event.GetPosition();
 163                 const wxPoint ofs = pos - m_posLast;
 164                 if ( abs(ofs.x) > dragMinX || abs(ofs.y) > dragMinY )
 165                 {
 166                     // the mouse left the rectangle inside which its movements
 167                     // are considered to be too small to constitute a start of
 168                     // drag operation, do [attempt to] start it now
 169                     if ( MouseDragBegin(m_item, pos) )
 170                     {
 171                         m_state = State_Dragging;
 172                     }
 173                 }
 174                 else // still didn't move far enough away
 175                 {
 176                     event.Skip();
 177                 }
 178             }
 179             break;
 180
 181         case State_Dragging:
 182             m_posLast = event.GetPosition();
 183             MouseDragging(m_item, m_posLast);
 184             break;
 185     }
 186 }
 187