include/wx/gtk/private/event.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/gtk/private/event.h
   3 // Purpose:     Helper functions for working with GDK and wx events
   4 // Author:      Vaclav Slavik
   5 // Created:     2011-10-14
   6 // Copyright:   (c) 2011 Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef _GTK_PRIVATE_EVENT_H_
  11 #define _GTK_PRIVATE_EVENT_H_
  12
  13 #if !GTK_CHECK_VERSION(2,10,0)
  14     // GTK+ can reliably detect Meta key state only since 2.10 when
  15     // GDK_META_MASK was introduced -- there wasn't any way to detect it
  16     // in older versions. wxGTK used GDK_MOD2_MASK for this purpose, but
  17     // GDK_MOD2_MASK is documented as:
  18     //
  19     //     the fifth modifier key (it depends on the modifier mapping of the X
  20     //     server which key is interpreted as this modifier)
  21     //
  22     // In other words, it isn't guaranteed to map to Meta. This is a real
  23     // problem: it is common to map NumLock to it (in fact, it's an exception
  24     // if the X server _doesn't_ use it for NumLock).  So the old code caused
  25     // wxKeyEvent::MetaDown() to always return true as long as NumLock was on
  26     // on many systems, which broke all applications using
  27     // wxKeyEvent::GetModifiers() to check modifiers state (see e.g.  here:
  28     // http://tinyurl.com/56lsk2).
  29     //
  30     // Because of this, it's better to not detect Meta key state at all than
  31     // to detect it incorrectly. Hence the following #define, which causes
  32     // m_metaDown to be always set to false.
  33     #define GDK_META_MASK 0
  34 #endif
  35
  36 namespace wxGTKImpl
  37 {
  38
  39 // init wxMouseEvent with the info from GdkEventXXX struct
  40 template<typename T> void InitMouseEvent(wxWindowGTK *win,
  41                                          wxMouseEvent& event,
  42                                          T *gdk_event)
  43 {
  44     event.m_shiftDown = (gdk_event->state & GDK_SHIFT_MASK) != 0;
  45     event.m_controlDown = (gdk_event->state & GDK_CONTROL_MASK) != 0;
  46     event.m_altDown = (gdk_event->state & GDK_MOD1_MASK) != 0;
  47     event.m_metaDown = (gdk_event->state & GDK_META_MASK) != 0;
  48     event.m_leftDown = (gdk_event->state & GDK_BUTTON1_MASK) != 0;
  49     event.m_middleDown = (gdk_event->state & GDK_BUTTON2_MASK) != 0;
  50     event.m_rightDown = (gdk_event->state & GDK_BUTTON3_MASK) != 0;
  51
  52     // In gdk/win32 VK_XBUTTON1 is translated to GDK_BUTTON4_MASK
  53     // and VK_XBUTTON2 to GDK_BUTTON5_MASK. In x11/gdk buttons 4/5
  54     // are wheel rotation and buttons 8/9 don't change the state.
  55     event.m_aux1Down = (gdk_event->state & GDK_BUTTON4_MASK) != 0;
  56     event.m_aux2Down = (gdk_event->state & GDK_BUTTON5_MASK) != 0;
  57
  58     wxPoint pt = win->GetClientAreaOrigin();
  59     event.m_x = (wxCoord)gdk_event->x - pt.x;
  60     event.m_y = (wxCoord)gdk_event->y - pt.y;
  61
  62     if ((win->m_wxwindow) && (win->GetLayoutDirection() == wxLayout_RightToLeft))
  63     {
  64         // origin in the upper right corner
  65         GtkAllocation a;
  66         gtk_widget_get_allocation(win->m_wxwindow, &a);
  67         int window_width = a.width;
  68         event.m_x = window_width - event.m_x;
  69     }
  70
  71     event.SetEventObject( win );
  72     event.SetId( win->GetId() );
  73     event.SetTimestamp( gdk_event->time );
  74 }
  75
  76 } // namespace wxGTKImpl
  77
  78 #endif // _GTK_PRIVATE_EVENT_H_
  79