3 * \file qt4/GuiSelection.cpp
4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
8 * \author Abdelrazak Younes
10 * Full author contact details are available in file CREDITS.
15 #include "GuiSelection.h"
17 #include "qt_helpers.h"
19 #include "support/debug.h"
20 #include "support/lstrings.h"
22 #include <QApplication>
30 using support::internalLineEnding;
31 using support::externalLineEnding;
34 GuiSelection::GuiSelection()
35 : selection_supported_(qApp->clipboard()->supportsSelection()),
38 connect(qApp->clipboard(), SIGNAL(selectionChanged()),
39 this, SLOT(on_dataChanged()));
40 // initialize clipboard status.
45 void GuiSelection::haveSelection(bool own)
47 if (!qApp->clipboard()->supportsSelection())
50 // Tell qt that we have a selection by setting a dummy selection.
51 // We don't use the interface provided by Qt for setting the
52 // selection for performance reasons (see documentation of
53 // Selection::put()). Instead we only tell here that we have a
54 // selection by setting the selection to the empty string.
55 // The real selection is set in GuiApplication::x11EventFilter when
56 // an application actually requests it.
57 // This way calling Selection::have() is cheap and we can do it as
59 //LYXERR(Debug::SELECTION, "GuiSelection: setting dummy selection");
61 qApp->clipboard()->setText(QString(), QClipboard::Selection);
62 // We don't need to do anything if own = false, as this case is
64 // FIXME (gb): This is wrong. What is missing here is rather a call of
66 // qApp->clipboard()->clear(QClipboard::Selection);
67 // Since we do not issue this call we rather implement
68 // "persistent selections" as far as X is concerned.
72 docstring const GuiSelection::get() const
74 QString const str = qApp->clipboard()->text(QClipboard::Selection)
75 .normalized(QString::NormalizationForm_C);
76 LYXERR(Debug::SELECTION, "GuiSelection::get: " << str);
80 return internalLineEnding(qstring_to_ucs4(str));
84 void GuiSelection::put(docstring const & str)
86 LYXERR(Debug::SELECTION, "GuiSelection::put: " << to_utf8(str));
88 qApp->clipboard()->setText(toqstr(externalLineEnding(str)),
89 QClipboard::Selection);
93 void GuiSelection::on_dataChanged()
95 schedule_check_ = true;
96 LYXERR(Debug::SELECTION, "GuiSelection::on_dataChanged");
100 bool GuiSelection::empty() const
102 if (!selection_supported_)
105 // Cache which is to speed up selection-status read
106 // (4 calls when openi Edit menu).
107 static bool text_selection_empty;
108 if (schedule_check_) {
109 text_selection_empty = qApp->clipboard()->
110 text(QClipboard::Selection).isEmpty();
111 schedule_check_ = false;
114 LYXERR(Debug::SELECTION, "GuiSelection::filled: " << !text_selection_empty);
115 return text_selection_empty;
118 } // namespace frontend
121 #include "GuiSelection_moc.cpp"