src/frontends/Selection.h

   1 // -*- C++ -*-
   2 /**
   3  * \file Selection.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author unknown
   8  * \author John Levon
   9  * \author Abdelrazak Younes
  10  *
  11  * Full author contact details are available in file CREDITS.
  12  */
  13
  14 #ifndef SELECTION_H
  15 #define SELECTION_H
  16
  17 #include "support/strfwd.h"
  18
  19 namespace lyx {
  20 namespace frontend {
  21
  22 /**
  23  * A Selection class manages the selection.
  24  */
  25 class Selection
  26 {
  27 public:
  28         virtual ~Selection() {}
  29
  30         /**
  31          * Tell the window system whether we set or cleared our selection.
  32          * This is a noop on systems that don't have a selection.
  33          * This should be called by the kernel whenever a selection is
  34          * created, changed or cleared.
  35          * \param own
  36          * If true: Tell that we got a valid selection.
  37          * If false: Tell that we cleared our selection.
  38          */
  39         virtual void haveSelection(bool) = 0;
  40         /**
  41          * Get the X selection contents.
  42          * This is a noop on systems that don't have a selection.
  43          * The format is plain text.
  44          * This should be called when the user presses the middle mouse
  45          * button.
  46          */
  47         virtual docstring const get() const = 0;
  48         /**
  49          * Fill the X selection.
  50          * The format is plain text.
  51          * Does nothing on systems that don't have a selection.
  52          * Since the X selection protocol is asyncronous this should never be
  53          * called from the kernel.
  54          * If another application requests the current selection a
  55          * SelectionRequest XEvent will be triggered. The response of the
  56          * frontend to this event should be to retrieve the current selection
  57          * from the kernel and push it to X with this method.
  58          */
  59         virtual void put(docstring const &) = 0;
  60         /**
  61          * Is the X selection empty?
  62          * This does always return true on systems that don't have a real
  63          * selection.
  64          */
  65         virtual bool empty() const = 0;
  66 };
  67
  68 } // namespace frontend
  69
  70 /// Implementation is in Application.cpp
  71 extern frontend::Selection & theSelection();
  72
  73 } // namespace lyx
  74
  75
  76 #endif // SELECTION_H