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 void wxMouseEventsManager::Init()
  49 {
  50     m_win = NULL;
  51     m_state = State_Normal;
  52     m_item = wxNOT_FOUND;
  53 }
  54
  55 bool wxMouseEventsManager::Create(wxWindow *win)
  56 {
  57     wxASSERT_MSG( !m_win, "Create() must not be called twice" );
  58
  59     m_win = win;
  60     win->PushEventHandler(this);
  61
  62     return true;
  63 }
  64
  65 wxMouseEventsManager::~wxMouseEventsManager()
  66 {
  67     if ( m_win )
  68         m_win->RemoveEventHandler(this);
  69 }
  70
  71 void wxMouseEventsManager::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
  72 {
  73     switch ( m_state )
  74     {
  75         case State_Normal:
  76             wxFAIL_MSG( "mouse shouldn't be captured in normal state" );
  77             break;
  78
  79         case State_Pressed:
  80             MouseClickCancelled(m_item);
  81             break;
  82
  83         case State_Dragging:
  84             MouseDragCancelled(m_item);
  85             break;
  86     }
  87
  88     m_state = State_Normal;
  89     m_item = wxNOT_FOUND;
  90 }
  91
  92 void wxMouseEventsManager::OnLeftDown(wxMouseEvent& event)
  93 {
  94     wxASSERT_MSG( m_state == State_Normal,
  95                   "state hasn't been reset to normal somehow" );
  96
  97     m_posLast = event.GetPosition();
  98     m_item = MouseHitTest(m_posLast);
  99     if ( m_item == wxNOT_FOUND )
 100     {
 101         event.Skip();
 102         return;
 103     }
 104
 105     m_state = State_Pressed;
 106     m_win->SetFocus();
 107     m_win->CaptureMouse();
 108     MouseClickBegin(m_item);
 109 }
 110
 111 void wxMouseEventsManager::OnLeftUp(wxMouseEvent& event)
 112 {
 113     switch ( m_state )
 114     {
 115         case State_Normal:
 116             // ignore it, the mouse hasn't been pressed over any item initially
 117             // so releasing it shouldn't do anything
 118             event.Skip();
 119
 120             // skip releasing the capture below
 121             return;
 122
 123         case State_Pressed:
 124             if ( MouseHitTest(event.GetPosition()) == m_item )
 125             {
 126                 // mouse released over the same item, so it was a click
 127                 MouseClicked(m_item);
 128             }
 129             break;
 130
 131         case State_Dragging:
 132             MouseDragEnd(m_item, event.GetPosition());
 133             break;
 134     }
 135
 136     m_state = State_Normal;
 137     m_item = wxNOT_FOUND;
 138     m_win->ReleaseMouse();
 139 }
 140
 141 void wxMouseEventsManager::OnMove(wxMouseEvent& event)
 142 {
 143     switch ( m_state )
 144     {
 145         case State_Normal:
 146             event.Skip();
 147             break;
 148
 149         case State_Pressed:
 150             wxASSERT_MSG( event.LeftIsDown(),
 151                           "should have detected mouse being released" );
 152
 153             {
 154                 // it's probably a bad idea to query the system for these
 155                 // values every time the mouse is moved so cache them on the
 156                 // assumption that they don't change -- which is wrong, of
 157                 // course, the user can change them but it doesn't happen often
 158                 static const int
 159                     dragMinX = wxSystemSettings::GetMetric(wxSYS_DRAG_X);
 160                 static const int
 161                     dragMinY = wxSystemSettings::GetMetric(wxSYS_DRAG_Y);
 162
 163                 const wxPoint& pos = event.GetPosition();
 164                 const wxPoint ofs = pos - m_posLast;
 165                 if ( abs(ofs.x) > dragMinX || abs(ofs.y) > dragMinY )
 166                 {
 167                     // the mouse left the rectangle inside which its movements
 168                     // are considered to be too small to constitute a start of
 169                     // drag operation, do [attempt to] start it now
 170                     if ( MouseDragBegin(m_item, pos) )
 171                     {
 172                         m_state = State_Dragging;
 173                     }
 174                 }
 175                 else // still didn't move far enough away
 176                 {
 177                     event.Skip();
 178                 }
 179             }
 180             break;
 181
 182         case State_Dragging:
 183             m_posLast = event.GetPosition();
 184             MouseDragging(m_item, m_posLast);
 185             break;
 186     }
 187 }
 188