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117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
// -*- C++ -*-
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/**
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* \file qt4/GuiSelection.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author John Levon
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* \author Abdelrazak Younes
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "GuiSelection.h"
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#include "qt_helpers.h"
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#include "support/debug.h"
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#include "support/lstrings.h"
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#include <QApplication>
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#include <QClipboard>
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#include <QString>
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namespace lyx {
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namespace frontend {
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GuiSelection::GuiSelection()
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: schedule_check_(true),
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selection_supported_(qApp->clipboard()->supportsSelection())
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{
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connect(qApp->clipboard(), SIGNAL(selectionChanged()),
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this, SLOT(on_dataChanged()));
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}
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void GuiSelection::haveSelection(bool own)
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{
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if (!selection_supported_)
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return;
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// Tell qt that we have a selection by setting a dummy selection.
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// We don't use the interface provided by Qt for setting the
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// selection for performance reasons (see documentation of
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// Selection::put()). Instead we only tell here that we have a
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// selection by setting the selection to the empty string.
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// The real selection is set in GuiApplication::x11EventFilter when
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// an application actually requests it.
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// This way calling Selection::have() is cheap and we can do it as
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// often as we want.
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//LYXERR(Debug::SELECTION, "GuiSelection: setting dummy selection");
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if (own)
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qApp->clipboard()->setText(QString(), QClipboard::Selection);
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// We don't need to do anything if own = false, as this case is
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// handled by QT.
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// FIXME (gb): This is wrong. What is missing here is rather a call of
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//else
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// qApp->clipboard()->clear(QClipboard::Selection);
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// Since we do not issue this call we rather implement
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// "persistent selections" as far as X is concerned.
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}
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docstring const GuiSelection::get() const
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{
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QString const str = qApp->clipboard()->text(QClipboard::Selection)
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.normalized(QString::NormalizationForm_C);
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LYXERR(Debug::SELECTION, "GuiSelection::get: " << str);
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if (str.isNull())
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return docstring();
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return internalLineEnding(str);
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}
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void GuiSelection::put(docstring const & str)
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{
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LYXERR(Debug::SELECTION, "GuiSelection::put: " << to_utf8(str));
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qApp->clipboard()->setText(externalLineEnding(str),
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QClipboard::Selection);
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}
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void GuiSelection::on_dataChanged()
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{
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schedule_check_ = true;
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LYXERR(Debug::SELECTION, "GuiSelection::on_dataChanged");
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}
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bool GuiSelection::empty() const
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{
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if (!selection_supported_)
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return true;
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// Cache which is to speed up selection-status read
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// (4 calls when open Edit menu).
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static bool text_selection_empty;
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if (schedule_check_) {
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text_selection_empty = qApp->clipboard()->
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text(QClipboard::Selection).isEmpty();
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schedule_check_ = false;
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}
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LYXERR(Debug::SELECTION, "GuiSelection::filled: " << !text_selection_empty);
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return text_selection_empty;
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}
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} // namespace frontend
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} // namespace lyx
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#include "moc_GuiSelection.cpp"
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