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 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2011 Vaclav Slavik
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _GTK_PRIVATE_EVENT_H_
  12 #define _GTK_PRIVATE_EVENT_H_
  13
  14 #if !GTK_CHECK_VERSION(2,10,0)
  15     // GTK+ can reliably detect Meta key state only since 2.10 when
  16     // GDK_META_MASK was introduced -- there wasn't any way to detect it
  17     // in older versions. wxGTK used GDK_MOD2_MASK for this purpose, but
  18     // GDK_MOD2_MASK is documented as:
  19     //
  20     //     the fifth modifier key (it depends on the modifier mapping of the X
  21     //     server which key is interpreted as this modifier)
  22     //
  23     // In other words, it isn't guaranteed to map to Meta. This is a real
  24     // problem: it is common to map NumLock to it (in fact, it's an exception
  25     // if the X server _doesn't_ use it for NumLock).  So the old code caused
  26     // wxKeyEvent::MetaDown() to always return true as long as NumLock was on
  27     // on many systems, which broke all applications using
  28     // wxKeyEvent::GetModifiers() to check modifiers state (see e.g.  here:
  29     // http://tinyurl.com/56lsk2).
  30     //
  31     // Because of this, it's better to not detect Meta key state at all than
  32     // to detect it incorrectly. Hence the following #define, which causes
  33     // m_metaDown to be always set to false.
  34     #define GDK_META_MASK 0
  35 #endif
  36
  37 namespace wxGTKImpl
  38 {
  39
  40 // init wxMouseEvent with the info from GdkEventXXX struct
  41 template<typename T> void InitMouseEvent(wxWindowGTK *win,
  42                                          wxMouseEvent& event,
  43                                          T *gdk_event)
  44 {
  45     event.m_shiftDown = (gdk_event->state & GDK_SHIFT_MASK) != 0;
  46     event.m_controlDown = (gdk_event->state & GDK_CONTROL_MASK) != 0;
  47     event.m_altDown = (gdk_event->state & GDK_MOD1_MASK) != 0;
  48     event.m_metaDown = (gdk_event->state & GDK_META_MASK) != 0;
  49     event.m_leftDown = (gdk_event->state & GDK_BUTTON1_MASK) != 0;
  50     event.m_middleDown = (gdk_event->state & GDK_BUTTON2_MASK) != 0;
  51     event.m_rightDown = (gdk_event->state & GDK_BUTTON3_MASK) != 0;
  52
  53     // In gdk/win32 VK_XBUTTON1 is translated to GDK_BUTTON4_MASK
  54     // and VK_XBUTTON2 to GDK_BUTTON5_MASK. In x11/gdk buttons 4/5
  55     // are wheel rotation and buttons 8/9 don't change the state.
  56     event.m_aux1Down = (gdk_event->state & GDK_BUTTON4_MASK) != 0;
  57     event.m_aux2Down = (gdk_event->state & GDK_BUTTON5_MASK) != 0;
  58
  59     wxPoint pt = win->GetClientAreaOrigin();
  60     event.m_x = (wxCoord)gdk_event->x - pt.x;
  61     event.m_y = (wxCoord)gdk_event->y - pt.y;
  62
  63     if ((win->m_wxwindow) && (win->GetLayoutDirection() == wxLayout_RightToLeft))
  64     {
  65         // origin in the upper right corner
  66         GtkAllocation a;
  67         gtk_widget_get_allocation(win->m_wxwindow, &a);
  68         int window_width = a.width;
  69         event.m_x = window_width - event.m_x;
  70     }
  71
  72     event.SetEventObject( win );
  73     event.SetId( win->GetId() );
  74     event.SetTimestamp( gdk_event->time );
  75 }
  76
  77 } // namespace wxGTKImpl
  78
  79 #endif // _GTK_PRIVATE_EVENT_H_
  80