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335 lines
12 KiB
335 lines
12 KiB
// -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 8; -*-
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/* This file is part of the KDE project
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Copyright (C) 2003 by Lubos Lunak <l.lunak@kde.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "clipboardpoll.h"
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#include <kapplication.h>
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#include <tqclipboard.h>
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#include <kdebug.h>
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#include <X11/Xatom.h>
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#include <time.h>
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#ifdef HAVE_XFIXES
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#include <X11/extensions/Xfixes.h>
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#endif
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#include "toplevel.h"
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//#define NOISY_KLIPPER_
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/*
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The polling magic:
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There's no way with X11 how to find out if the selection has changed (unless its ownership
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is taken away from the current client). In the future, there will be hopefully such notification,
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which will make this whole file more or less obsolete. But for now, Klipper has to poll.
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In order to avoid transferring all the data on every time pulse, this file implements two
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optimizations: The first one is checking whether the selection owner is Qt application (using
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the _QT_SELECTION/CLIPBOARD_SENTINEL atoms on the root window of screen 0), and if yes,
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Klipper can rely on TQClipboard's signals. If the owner is not Qt app, and the ownership has changed,
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it means the selection has changed as well. Otherwise, first only the timestamp
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of the last selection change is requested using the TIMESTAMP selection target, and if it's
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the same, it's assumed the contents haven't changed. Note that some applications (like XEmacs) does
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not provide this information, so Klipper has to assume that the clipboard might have changed in this
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case --- this is what is meant by REFUSED below.
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Update: Now there's also support for XFixes, so in case XFixes support is detected, only XFixes is
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used for detecting changes, everything else is ignored, even Qt's clipboard signals.
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*/
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ClipboardPoll::ClipboardPoll( TQWidget* parent )
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: TQWidget( parent )
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, xfixes_event_base( -1 )
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{
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hide();
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const char* names[ 6 ]
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= { "_QT_SELECTION_SENTINEL",
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"_QT_CLIPBOARD_SENTINEL",
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"CLIPBOARD",
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"TIMESTAMP",
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"KLIPPER_SELECTION_TIMESTAMP",
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"KLIPPER_CLIPBOARD_TIMESTAMP" };
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Atom atoms[ 6 ];
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XInternAtoms( qt_xdisplay(), const_cast< char** >( names ), 6, False, atoms );
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selection.sentinel_atom = atoms[ 0 ];
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clipboard.sentinel_atom = atoms[ 1 ];
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xa_clipboard = atoms[ 2 ];
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xa_timestamp = atoms[ 3 ];
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selection.timestamp_atom = atoms[ 4 ];
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clipboard.timestamp_atom = atoms[ 5 ];
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bool use_polling = true;
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kapp->installX11EventFilter( this );
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#ifdef HAVE_XFIXES
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int dummy;
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if( XFixesQueryExtension( qt_xdisplay(), &xfixes_event_base, &dummy ))
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{
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XFixesSelectSelectionInput( qt_xdisplay(), qt_xrootwin( 0 ), XA_PRIMARY,
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XFixesSetSelectionOwnerNotifyMask |
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XFixesSelectionWindowDestroyNotifyMask |
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XFixesSelectionClientCloseNotifyMask );
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XFixesSelectSelectionInput( qt_xdisplay(), qt_xrootwin( 0 ), xa_clipboard,
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XFixesSetSelectionOwnerNotifyMask |
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XFixesSelectionWindowDestroyNotifyMask |
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XFixesSelectionClientCloseNotifyMask );
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use_polling = false;
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#ifdef NOISY_KLIPPER_
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kdDebug() << "Using XFIXES" << endl;
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#endif
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}
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#endif
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if( use_polling )
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{
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#ifdef NOISY_KLIPPER_
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kdDebug() << "Using polling" << endl;
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#endif
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initPolling();
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}
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}
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void ClipboardPoll::initPolling()
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{
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connect( kapp->tqclipboard(), TQT_SIGNAL( selectionChanged() ), TQT_SLOT(qtSelectionChanged()));
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connect( kapp->tqclipboard(), TQT_SIGNAL( dataChanged() ), TQT_SLOT( qtClipboardChanged() ));
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connect( &timer, TQT_SIGNAL( timeout()), TQT_SLOT( timeout()));
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timer.start( 1000, false );
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selection.atom = XA_PRIMARY;
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clipboard.atom = xa_clipboard;
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selection.last_change = clipboard.last_change = GET_QT_X_TIME(); // don't trigger right after startup
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selection.last_owner = XGetSelectionOwner( qt_xdisplay(), XA_PRIMARY );
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#ifdef NOISY_KLIPPER_
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kdDebug() << "(1) Setting last_owner for =" << "selection" << ":" << selection.last_owner << endl;
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#endif
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clipboard.last_owner = XGetSelectionOwner( qt_xdisplay(), xa_clipboard );
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#ifdef NOISY_KLIPPER_
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kdDebug() << "(2) Setting last_owner for =" << "clipboard" << ":" << clipboard.last_owner << endl;
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#endif
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selection.waiting_for_timestamp = false;
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clipboard.waiting_for_timestamp = false;
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updateQtOwnership( selection );
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updateQtOwnership( clipboard );
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}
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void ClipboardPoll::qtSelectionChanged()
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{
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emit clipboardChanged( true );
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}
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void ClipboardPoll::qtClipboardChanged()
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{
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emit clipboardChanged( false );
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}
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bool ClipboardPoll::x11Event( XEvent* e )
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{
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// note that this is also installed as app-wide filter
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#ifdef HAVE_XFIXES
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if( xfixes_event_base != -1 && e->type == xfixes_event_base + XFixesSelectionNotify )
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{
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XFixesSelectionNotifyEvent* ev = reinterpret_cast< XFixesSelectionNotifyEvent* >( e );
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if( ev->selection == XA_PRIMARY && !kapp->tqclipboard()->ownsSelection())
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{
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#ifdef NOISY_KLIPPER_
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kdDebug() << "SELECTION CHANGED (XFIXES)" << endl;
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#endif
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SET_QT_X_TIME(ev->timestamp);
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emit clipboardChanged( true );
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}
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else if( ev->selection == xa_clipboard && !kapp->tqclipboard()->ownsClipboard())
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{
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#ifdef NOISY_KLIPPER_
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kdDebug() << "CLIPBOARD CHANGED (XFIXES)" << endl;
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#endif
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SET_QT_X_TIME(ev->timestamp);
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emit clipboardChanged( false );
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}
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}
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#endif
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if( e->type == SelectionNotify && e->xselection.requestor == winId())
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{
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if( changedTimestamp( selection, *e ) ) {
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#ifdef NOISY_KLIPPER_
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kdDebug() << "SELECTION CHANGED (GOT TIMESTAMP)" << endl;
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#endif
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emit clipboardChanged( true );
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}
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if ( changedTimestamp( clipboard, *e ) )
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{
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#ifdef NOISY_KLIPPER_
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kdDebug() << "CLIPBOARD CHANGED (GOT TIMESTAMP)" << endl;
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#endif
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emit clipboardChanged( false );
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}
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return true; // filter out
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}
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return false;
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}
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void ClipboardPoll::updateQtOwnership( SelectionData& data )
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{
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Atom type;
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int format;
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unsigned long nitems;
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unsigned long after;
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unsigned char* prop = NULL;
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if( XGetWindowProperty( qt_xdisplay(), qt_xrootwin( 0 ), data.sentinel_atom, 0, 2, False,
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XA_WINDOW, &type, &format, &nitems, &after, &prop ) != Success
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|| type != XA_WINDOW || format != 32 || nitems != 2 || prop == NULL )
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{
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#ifdef REALLY_NOISY_KLIPPER_
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kdDebug() << "UPDATEQT BAD PROPERTY" << endl;
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#endif
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data.owner_is_qt = false;
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if( prop != NULL )
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XFree( prop );
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return;
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}
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Window owner = reinterpret_cast< long* >( prop )[ 0 ]; // [0] is new owner, [1] is previous
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XFree( prop );
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Window current_owner = XGetSelectionOwner( qt_xdisplay(), data.atom );
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data.owner_is_qt = ( owner == current_owner );
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#ifdef REALLY_NOISY_KLIPPER_
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kdDebug() << "owner=" << owner << "; current_owner=" << current_owner << endl;
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kdDebug() << "UPDATEQT:" << ( &data == &selection ? "selection" : "clipboard" ) << ":" << data.owner_is_qt << endl;
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#endif
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}
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void ClipboardPoll::timeout()
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{
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KlipperWidget::updateTimestamp();
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if( !kapp->tqclipboard()->ownsSelection() && checkTimestamp( selection ) ) {
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#ifdef NOISY_KLIPPER_
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kdDebug() << "SELECTION CHANGED" << endl;
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#endif
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emit clipboardChanged( true );
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}
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if( !kapp->tqclipboard()->ownsClipboard() && checkTimestamp( clipboard ) ) {
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#ifdef NOISY_KLIPPER_
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kdDebug() << "CLIPBOARD CHANGED" << endl;
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#endif
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emit clipboardChanged( false );
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}
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}
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bool ClipboardPoll::checkTimestamp( SelectionData& data )
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{
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Window current_owner = XGetSelectionOwner( qt_xdisplay(), data.atom );
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bool signal = false;
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updateQtOwnership( data );
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if( data.owner_is_qt )
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{
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data.last_change = CurrentTime;
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#ifdef REALLY_NOISY_KLIPPER_
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kdDebug() << "(3) Setting last_owner for =" << ( &data==&selection ?"selection":"clipboard" ) << ":" << current_owner << endl;
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#endif
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data.last_owner = current_owner;
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data.waiting_for_timestamp = false;
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return false;
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}
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if( current_owner != data.last_owner )
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{
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signal = true; // owner has changed
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data.last_owner = current_owner;
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#ifdef REALLY_NOISY_KLIPPER_
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kdDebug() << "(4) Setting last_owner for =" << ( &data==&selection ?"selection":"clipboard" ) << ":" << current_owner << endl;
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#endif
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data.waiting_for_timestamp = false;
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data.last_change = CurrentTime;
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#ifdef REALLY_NOISY_KLIPPER_
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kdDebug() << "OWNER CHANGE:" << ( data.atom == XA_PRIMARY ) << ":" << current_owner << endl;
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#endif
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return true;
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}
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if( current_owner == None ) {
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return false; // None also last_owner...
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}
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if( data.waiting_for_timestamp ) {
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// We're already waiting for the timestamp of the last check
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return false;
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}
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XDeleteProperty( qt_xdisplay(), winId(), data.timestamp_atom );
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XConvertSelection( qt_xdisplay(), data.atom, xa_timestamp, data.timestamp_atom, winId(), GET_QT_X_TIME() );
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data.waiting_for_timestamp = true;
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data.waiting_x_time = GET_QT_X_TIME();
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#ifdef REALLY_NOISY_KLIPPER_
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kdDebug() << "WAITING TIMESTAMP:" << ( data.atom == XA_PRIMARY ) << endl;
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#endif
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return false;
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}
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bool ClipboardPoll::changedTimestamp( SelectionData& data, const XEvent& ev )
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{
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if( ev.xselection.requestor != winId()
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|| ev.xselection.selection != data.atom
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|| ev.xselection.time != data.waiting_x_time )
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{
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return false;
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}
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data.waiting_for_timestamp = false;
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if( ev.xselection.property == None )
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{
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#ifdef NOISY_KLIPPER_
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kdDebug() << "REFUSED:" << ( data.atom == XA_PRIMARY ) << endl;
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#endif
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return true;
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}
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Atom type;
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int format;
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unsigned long nitems;
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unsigned long after;
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unsigned char* prop = NULL;
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if( XGetWindowProperty( qt_xdisplay(), winId(), ev.xselection.property, 0, 1, False,
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AnyPropertyType, &type, &format, &nitems, &after, &prop ) != Success
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|| format != 32 || nitems != 1 || prop == NULL )
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{
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#ifdef NOISY_KLIPPER_
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kdDebug() << "BAD PROPERTY:" << ( data.atom == XA_PRIMARY ) << endl;
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#endif
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if( prop != NULL )
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XFree( prop );
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return true;
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}
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Time timestamp = reinterpret_cast< long* >( prop )[ 0 ];
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XFree( prop );
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#ifdef NOISY_KLIPPER_
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kdDebug() << "GOT TIMESTAMP:" << ( data.atom == XA_PRIMARY ) << endl;
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kdDebug() << "timestamp=" << timestamp
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<< "; CurrentTime=" << CurrentTime
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<< "; last_change=" << data.last_change
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<< endl;
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#endif
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if( timestamp != data.last_change || timestamp == CurrentTime )
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{
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#ifdef NOISY_KLIPPER_
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kdDebug() << "TIMESTAMP CHANGE:" << ( data.atom == XA_PRIMARY ) << endl;
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#endif
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data.last_change = timestamp;
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return true;
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}
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return false; // ok, same timestamp
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}
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#include "clipboardpoll.moc"
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