Sourcecode hierarchy cleanup: Move folders "tooltips" and "versioncontrol" into "views"

svn path=/trunk/KDE/kdebase/apps/; revision=1154151

7 files changed, 889 insertions, 0 deletions

diff --git a/src/views/versioncontrol/fileviewversioncontrolplugin.desktop b/src/views/versioncontrol/fileviewversioncontrolplugin.desktop
new file mode 100644
index 000000000..4239d4ddc
--- /dev/null
+++ b/src/views/versioncontrol/fileviewversioncontrolplugin.desktop
@@ -0,0 +1,60 @@
+[Desktop Entry]
+Type=ServiceType
+X-KDE-ServiceType=FileViewVersionControlPlugin
+Comment=Version Control Plugin for File Views
+Comment[ca]=Connector de control de versions per a les vistes de fitxers
+Comment[ca@valencia]=Connector de control de versions per a les vistes de fitxers
+Comment[cs]=Modul pro správu verzí pro pohledy na soubory
+Comment[csb]=Wtëkôcz kòntrolë wersëji dlô pòdzerków lopków
+Comment[da]=Versionsstyringsplugin til filvisninger
+Comment[de]=Versionskontroll-Modul für Dateiansichten
+Comment[el]=Έλεγχος εκδόσεων πρόσθετων για την προβολή των αρχείων
+Comment[en_GB]=Version Control Plugin for File Views
+Comment[eo]=Kromprogramo de versia kontrolo por dosiervidilo
+Comment[es]=Complemento de control de versiones para vistas de archivos
+Comment[et]=Failivaadete versioonikontrolli plugin
+Comment[eu]=Bertsio kontrol plugina fitxategi ikuspegietarako
+Comment[fi]=Versionhallintaliitännäinen tiedostonäkymille
+Comment[fr]=Module externe de contrôle de révision pour la vue de fichiers
+Comment[fy]=Ferzje kontrôle plugin foar triem werjeften
+Comment[hr]=Priključak sustava kontrole inačica za prikaz datoteka
+Comment[hu]=Verziókövető modul fájlnézetekhez
+Comment[ia]=Plugin de Controlo de Version pro vistas de file
+Comment[id]=Plugin Kontrol Versi untuk Tampilan Berkas
+Comment[is]=Útgáfustýringar-íforrit fyrir skráasýnir
+Comment[it]=Estensione di controllo delle versioni per le viste dei file
+Comment[ja]=ファイルビューのためのバージョン管理プラグイン
+Comment[kk]=Файл көрнісіне арналған Нұсқаларды басқару плагины
+Comment[km]=កំណែ​កម្មវិធី​ជំនួយ​វត្ថុ​បញ្ជា​​សម្រាប់​មើល​ឯកសារ
+Comment[kn]=ಕಡತ ನೋಟಗಳಿಗಾಗಿ ಆವೃತ್ತಿ ನಿಯಂತ್ರಣಾ ವ್ಯವಸ್ಥೆ ಪ್ಲಗ್ಗಿನ್ (ಮಿಳಿತಾನ್ವಯ)
+Comment[ko]=파일 보기를 위한 버전 관리 플러그인
+Comment[lt]=Versijų kontrolės priedas failų tvarkyklėms
+Comment[lv]=Versiju kontroles spraudnis Failu skatiem
+Comment[mk]=Приклучок за „Преглед на датотеки“ за контрола на верзии
+Comment[ml]=ഫയല്‍ അവതരണത്തിനുള്ള വേര്‍ഷന്‍ കണ്ട്രോള്‍ സംയോജകം
+Comment[nb]=Versjonskontrollmodul for filvisninger
+Comment[nds]=Verschoonkuntrull-Moduul för Dateiansichten
+Comment[nl]=Plugin voor versiecontrole op bestandoverzichten
+Comment[nn]=Versjonskontroll-tillegg for filvisingar
+Comment[pa]=ਫਾਇਲ ਝਲਕ ਲਈ ਵਰਜਨ ਕੰਟਰੋਲ ਪਲੱਗਇਨ
+Comment[pl]=Wtyczka kontroli wersji dla widoku plików
+Comment[pt]='Plugin' de Controlo de Versões para as Áreas de Ficheiros
+Comment[pt_BR]=Extensão de controle de versões para as visualizações de arquivos
+Comment[ro]=Modul de control al versiunii pentru Vizualizări fișiere
+Comment[ru]=Расширение для управления версиями для компонента просмотра папки
+Comment[si]=ගොනු දැකුම් සඳහා අනුවාද පාලන ප්ලගින
+Comment[sk]=Modul pre správu verzií v súborovom zobrazení
+Comment[sl]=Vstavek za delo z nadzorom različic za prikaz datotek
+Comment[sr]=Прикључак управљања верзијама за фајл приказе
+Comment[sr@ijekavian]=Прикључак управљања верзијама за фајл приказе
+Comment[sr@ijekavianlatin]=Priključak upravljanja verzijama za fajl prikaze
+Comment[sr@latin]=Priključak upravljanja verzijama za fajl prikaze
+Comment[sv]=Insticksprogram för versionskontroll i filvyer
+Comment[tg]=Модули идоракунӣ барои намоиши файлҳо
+Comment[th]=ส่วนเสริมการควบคุมเวอร์ชันสำหรับมุมมองแฟ้มต่าง ๆ
+Comment[tr]=Dosya Görünümleri için Sürüm Kontrol Eklentisi
+Comment[uk]=Додаток керування версіями для панелей перегляду файлів
+Comment[wa]=Tchôke-divins di controle del modêye po les Vuwes des fitchîs
+Comment[x-test]=xxVersion Control Plugin for File Viewsxx
+Comment[zh_CN]=文件视图的版本控制插件
+Comment[zh_TW]=檔案檢視的版本控制外掛程式
diff --git a/src/views/versioncontrol/pendingthreadsmaintainer.cpp b/src/views/versioncontrol/pendingthreadsmaintainer.cpp
new file mode 100644
index 000000000..f61c79975
--- /dev/null
+++ b/src/views/versioncontrol/pendingthreadsmaintainer.cpp
@@ -0,0 +1,77 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#include "pendingthreadsmaintainer.h"
+
+#include <kglobal.h>
+#include <QThread>
+#include <QTimer>
+
+struct PendingThreadsMaintainerSingleton
+{
+    PendingThreadsMaintainer instance;
+};
+K_GLOBAL_STATIC(PendingThreadsMaintainerSingleton, s_pendingThreadsMaintainer)
+
+
+PendingThreadsMaintainer& PendingThreadsMaintainer::instance()
+{
+    return s_pendingThreadsMaintainer->instance;
+}
+
+PendingThreadsMaintainer::~PendingThreadsMaintainer()
+{
+}
+
+void PendingThreadsMaintainer::append(QThread* thread)
+{
+    Q_ASSERT(thread != 0);
+    m_threads.append(thread);
+    m_timer->start();
+}
+
+PendingThreadsMaintainer::PendingThreadsMaintainer() :
+    QObject(),
+    m_threads(),
+    m_timer(0)
+{
+    m_timer = new QTimer(this);
+    m_timer->setSingleShot(true);
+    m_timer->setInterval(5000); // 5 seconds
+    connect(m_timer, SIGNAL(timeout()), this, SLOT(cleanup()));
+}
+
+void PendingThreadsMaintainer::cleanup()
+{
+    QList<QThread*>::iterator it = m_threads.begin();
+    while (it != m_threads.end()) {
+        if ((*it)->isFinished()) {
+            (*it)->deleteLater();
+            it = m_threads.erase(it);
+        } else {
+            ++it;
+        }
+    }
+
+    if (!m_threads.isEmpty()) {
+        m_timer->start();
+    }
+}
+
+#include "pendingthreadsmaintainer.moc"
diff --git a/src/views/versioncontrol/pendingthreadsmaintainer.h b/src/views/versioncontrol/pendingthreadsmaintainer.h
new file mode 100644
index 000000000..342cb421d
--- /dev/null
+++ b/src/views/versioncontrol/pendingthreadsmaintainer.h
@@ -0,0 +1,83 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#ifndef PENDINGTHREADSMAINTAINER_H
+#define PENDINGTHREADSMAINTAINER_H
+
+#include <libdolphin_export.h>
+
+#include <QObject>
+
+class QTimer;
+
+/**
+ * If the creator of a thread gets deleted, although the thread is still
+ * working, usually QThread::wait() is invoked. The drawback of this
+ * approach is that the user interface gets blocked for an undefined amount
+ * of time. If the thread does not contain references to the creator, the
+ * deleting can be forwarded to the PendingThreadsMaintainer. In the following
+ * example it is assumed, that m_thread will be 0, if it has been deleted by the
+ * creator after receiving the signal QThread::finished():
+ *
+ * \code
+ * ThreadCreator::~ThreadCreator()
+ * {
+ *     if (m_thread != 0) {
+ *         PendingThreadsMaintainer::instance().append(m_thread);
+ *         m_thread = 0;
+ *     }
+ * }
+ * \endcode
+ *
+ * The thread will get automatically deleted after it (or has already) been finished.
+ *
+ * Implementation note: Connecting to the signal QThread::finished() is
+ * not sufficient, as it is possible that the thread has already emitted
+ * the signal, but the signal has not been received yet by the thread creator.
+ * Because of this a polling is done each 5 seconds to check, whether the
+ * thread has been finished.
+ */
+class LIBDOLPHINPRIVATE_EXPORT PendingThreadsMaintainer : public QObject
+{
+    Q_OBJECT
+
+public:
+    static PendingThreadsMaintainer& instance();
+    virtual ~PendingThreadsMaintainer();
+
+    /**
+     * Appends the thread \p thread to the maintainer. The thread
+     * will be deleted by the maintainer after it has been finished.
+     */
+    void append(QThread* thread);
+
+protected:
+    PendingThreadsMaintainer();
+
+private slots:
+    void cleanup();
+
+private:
+    QList<QThread*> m_threads;
+    QTimer* m_timer;
+
+    friend class PendingThreadsMaintainerSingleton;
+};
+
+#endif
diff --git a/src/views/versioncontrol/updateitemstatesthread.cpp b/src/views/versioncontrol/updateitemstatesthread.cpp
new file mode 100644
index 000000000..57c4481c3
--- /dev/null
+++ b/src/views/versioncontrol/updateitemstatesthread.cpp
@@ -0,0 +1,101 @@
+/***************************************************************************
+ *   Copyright (C) 2009 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#include "updateitemstatesthread.h"
+
+#include <QMutexLocker>
+
+UpdateItemStatesThread::UpdateItemStatesThread() :
+    QThread(),
+    m_globalPluginMutex(0),
+    m_plugin(0),
+    m_itemMutex(),
+    m_retrievedItems(false),
+    m_itemStates()
+{
+    // Several threads may share one instance of a plugin. A global
+    // mutex is required to serialize the retrieval of version control
+    // states inside run().
+    static QMutex globalMutex;
+    m_globalPluginMutex = &globalMutex;
+}
+
+UpdateItemStatesThread::~UpdateItemStatesThread()
+{
+}
+
+void UpdateItemStatesThread::setData(KVersionControlPlugin* plugin,
+                                     const QList<VersionControlObserver::ItemState>& itemStates)
+{
+    QMutexLocker itemLocker(&m_itemMutex);
+    m_itemStates = itemStates;
+
+    QMutexLocker pluginLocker(m_globalPluginMutex);
+    m_plugin = plugin;
+}
+
+void UpdateItemStatesThread::run()
+{
+    Q_ASSERT(!m_itemStates.isEmpty());
+    Q_ASSERT(m_plugin != 0);
+
+    // The items from m_itemStates may be located in different directory levels. The version
+    // plugin requires the root directory for KVersionControlPlugin::beginRetrieval(). Instead
+    // of doing an expensive search, we utilize the knowledge of the implementation of
+    // VersionControlObserver::addDirectory() to be sure that the last item contains the root.
+    QMutexLocker itemLocker(&m_itemMutex);
+    const QString directory = m_itemStates.last().item.url().directory(KUrl::AppendTrailingSlash);
+    itemLocker.unlock();
+
+    QMutexLocker pluginLocker(m_globalPluginMutex);
+    m_retrievedItems = false;
+    if (m_plugin->beginRetrieval(directory)) {
+        itemLocker.relock();
+        const int count = m_itemStates.count();
+        for (int i = 0; i < count; ++i) {
+            m_itemStates[i].version = m_plugin->versionState(m_itemStates[i].item);
+        }
+        m_plugin->endRetrieval();
+        m_retrievedItems = true;
+    }
+}
+
+bool UpdateItemStatesThread::lockPlugin()
+{
+    return m_globalPluginMutex->tryLock(300);
+}
+
+void UpdateItemStatesThread::unlockPlugin()
+{
+    m_globalPluginMutex->unlock();
+}
+
+QList<VersionControlObserver::ItemState> UpdateItemStatesThread::itemStates() const
+{
+    QMutexLocker locker(&m_itemMutex);
+    return m_itemStates;
+}
+
+bool UpdateItemStatesThread::retrievedItems() const
+{
+    QMutexLocker locker(&m_itemMutex);
+    return m_retrievedItems;
+}
+
+#include "updateitemstatesthread.moc"
diff --git a/src/views/versioncontrol/updateitemstatesthread.h b/src/views/versioncontrol/updateitemstatesthread.h
new file mode 100644
index 000000000..9fac6192c
--- /dev/null
+++ b/src/views/versioncontrol/updateitemstatesthread.h
@@ -0,0 +1,84 @@
+/***************************************************************************
+ *   Copyright (C) 2009 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#ifndef UPDATEITEMSTATESTHREAD_H
+#define UPDATEITEMSTATESTHREAD_H
+
+#include <libdolphin_export.h>
+#include <views/versioncontrol/versioncontrolobserver.h>
+
+#include <QMutex>
+#include <QThread>
+
+class KVersionControlPlugin;
+
+/**
+ * The performance of updating the version state of items depends
+ * on the used plugin. To prevent that Dolphin gets blocked by a
+ * slow plugin, the updating is delegated to a thread.
+ */
+class LIBDOLPHINPRIVATE_EXPORT UpdateItemStatesThread : public QThread
+{
+    Q_OBJECT
+
+public:
+    UpdateItemStatesThread();
+    virtual ~UpdateItemStatesThread();
+
+    /**
+     * @param plugin     Version control plugin that is used to update the
+     *                   state of the items. Whenever the plugin is accessed
+     *                   from the thread creator after starting the thread,
+     *                   UpdateItemStatesThread::lockPlugin() and
+     *                   UpdateItemStatesThread::unlockPlugin() must be used.
+     * @param itemStates List of items, where the states get updated.
+     */
+    void setData(KVersionControlPlugin* plugin,
+                 const QList<VersionControlObserver::ItemState>& itemStates);
+
+    /**
+     * Whenever the plugin is accessed by the thread creator, lockPlugin() must
+     * be invoked. True is returned, if the plugin could be locked within 300
+     * milliseconds.
+     */
+    bool lockPlugin();
+
+    /**
+     * Must be invoked if lockPlugin() returned true and plugin has been accessed
+     * by the thread creator.
+     */
+    void unlockPlugin();
+
+    QList<VersionControlObserver::ItemState> itemStates() const;
+
+    bool retrievedItems() const;
+
+protected:
+    virtual void run();
+
+private:
+    QMutex* m_globalPluginMutex; // Protects the m_plugin globally
+    KVersionControlPlugin* m_plugin;
+
+    mutable QMutex m_itemMutex; // Protects m_retrievedItems and m_itemStates
+    bool m_retrievedItems;
+    QList<VersionControlObserver::ItemState> m_itemStates;
+};
+
+#endif // UPDATEITEMSTATESTHREAD_H
diff --git a/src/views/versioncontrol/versioncontrolobserver.cpp b/src/views/versioncontrol/versioncontrolobserver.cpp
new file mode 100644
index 000000000..51337e097
--- /dev/null
+++ b/src/views/versioncontrol/versioncontrolobserver.cpp
@@ -0,0 +1,335 @@
+/***************************************************************************
+ *   Copyright (C) 2009 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#include "versioncontrolobserver.h"
+
+#include "dolphin_versioncontrolsettings.h"
+
+#include <kdirlister.h>
+#include <klocale.h>
+#include <kservice.h>
+#include <kservicetypetrader.h>
+#include <kversioncontrolplugin.h>
+
+#include "pendingthreadsmaintainer.h"
+#include "updateitemstatesthread.h"
+
+#include <QAbstractProxyModel>
+#include <QAbstractItemView>
+#include <QMutexLocker>
+#include <QTimer>
+
+#include <views/dolphinmodel.h>
+
+VersionControlObserver::VersionControlObserver(QAbstractItemView* view) :
+    QObject(view),
+    m_pendingItemStatesUpdate(false),
+    m_versionedDirectory(false),
+    m_silentUpdate(false),
+    m_view(view),
+    m_dirLister(0),
+    m_dolphinModel(0),
+    m_dirVerificationTimer(0),
+    m_plugin(0),
+    m_updateItemStatesThread(0)
+{
+    Q_ASSERT(view != 0);
+
+    QAbstractProxyModel* proxyModel = qobject_cast<QAbstractProxyModel*>(view->model());
+    m_dolphinModel = (proxyModel == 0) ?
+                     qobject_cast<DolphinModel*>(view->model()) :
+                     qobject_cast<DolphinModel*>(proxyModel->sourceModel());
+    if (m_dolphinModel != 0) {
+        m_dirLister = m_dolphinModel->dirLister();
+        connect(m_dirLister, SIGNAL(completed()),
+                this, SLOT(delayedDirectoryVerification()));
+
+        // The verification timer specifies the timeout until the shown directory
+        // is checked whether it is versioned. Per default it is assumed that users
+        // don't iterate through versioned directories and a high timeout is used
+        // The timeout will be decreased as soon as a versioned directory has been
+        // found (see verifyDirectory()).
+        m_dirVerificationTimer = new QTimer(this);
+        m_dirVerificationTimer->setSingleShot(true);
+        m_dirVerificationTimer->setInterval(500);
+        connect(m_dirVerificationTimer, SIGNAL(timeout()),
+                this, SLOT(verifyDirectory()));
+    }
+}
+
+VersionControlObserver::~VersionControlObserver()
+{
+    if (m_updateItemStatesThread != 0) {
+        if (m_updateItemStatesThread->isFinished()) {
+            delete m_updateItemStatesThread;
+            m_updateItemStatesThread = 0;
+        } else {
+            // The version controller gets deleted, while a thread still
+            // is working to get the version information. To avoid a blocking
+            // user interface, the thread will be forwarded to the
+            // PendingThreadsMaintainer, which will delete the thread later.
+            disconnect(m_updateItemStatesThread, SIGNAL(finished()),
+                       this, SLOT(slotThreadFinished()));
+            PendingThreadsMaintainer::instance().append(m_updateItemStatesThread);
+            m_updateItemStatesThread = 0;
+        }
+    }
+
+    if (m_plugin != 0) {
+        m_plugin->disconnect();
+        m_plugin = 0;
+    }
+}
+
+QList<QAction*> VersionControlObserver::contextMenuActions(const KFileItemList& items) const
+{
+    QList<QAction*> actions;
+    if (isVersioned() && m_updateItemStatesThread->lockPlugin()) {
+        actions = m_plugin->contextMenuActions(items);
+        m_updateItemStatesThread->unlockPlugin();
+    }
+    return actions;
+}
+
+QList<QAction*> VersionControlObserver::contextMenuActions(const QString& directory) const
+{
+    QList<QAction*> actions;
+    if (isVersioned() && m_updateItemStatesThread->lockPlugin()) {
+        actions = m_plugin->contextMenuActions(directory);
+        m_updateItemStatesThread->unlockPlugin();
+    }
+
+    return actions;
+}
+
+void VersionControlObserver::delayedDirectoryVerification()
+{
+    m_silentUpdate = false;
+    m_dirVerificationTimer->start();
+}
+
+void VersionControlObserver::silentDirectoryVerification()
+{
+    m_silentUpdate = true;
+    m_dirVerificationTimer->start();
+}
+
+void VersionControlObserver::verifyDirectory()
+{
+    const KUrl versionControlUrl = m_dirLister->url();
+    if (!versionControlUrl.isLocalFile()) {
+        return;
+    }
+
+    if (m_plugin != 0) {
+        m_plugin->disconnect();
+    }
+
+    m_plugin = searchPlugin(versionControlUrl);
+    if (m_plugin != 0) {
+        connect(m_plugin, SIGNAL(versionStatesChanged()),
+                this, SLOT(silentDirectoryVerification()));
+        connect(m_plugin, SIGNAL(infoMessage(QString)),
+                this, SIGNAL(infoMessage(QString)));
+        connect(m_plugin, SIGNAL(errorMessage(QString)),
+                this, SIGNAL(errorMessage(QString)));
+        connect(m_plugin, SIGNAL(operationCompletedMessage(QString)),
+                this, SIGNAL(operationCompletedMessage(QString)));
+
+        if (!m_versionedDirectory) {
+            m_versionedDirectory = true;
+
+            // The directory is versioned. Assume that the user will further browse through
+            // versioned directories and decrease the verification timer.
+            m_dirVerificationTimer->setInterval(100);
+            connect(m_dirLister, SIGNAL(refreshItems(const QList<QPair<KFileItem,KFileItem>>&)),
+                    this, SLOT(delayedDirectoryVerification()));
+            connect(m_dirLister, SIGNAL(newItems(const KFileItemList&)),
+                    this, SLOT(delayedDirectoryVerification()));
+        }
+        updateItemStates();
+    } else if (m_versionedDirectory) {
+        m_versionedDirectory = false;
+
+        // The directory is not versioned. Reset the verification timer to a higher
+        // value, so that browsing through non-versioned directories is not slown down
+        // by an immediate verification.
+        m_dirVerificationTimer->setInterval(500);
+        disconnect(m_dirLister, SIGNAL(refreshItems(const QList<QPair<KFileItem,KFileItem>>&)),
+                   this, SLOT(delayedDirectoryVerification()));
+        disconnect(m_dirLister, SIGNAL(newItems(const KFileItemList&)),
+                   this, SLOT(delayedDirectoryVerification()));
+    }
+}
+
+void VersionControlObserver::slotThreadFinished()
+{
+    if (m_plugin == 0) {
+        return;
+    }
+
+    if (!m_updateItemStatesThread->retrievedItems()) {
+        // ignore m_silentUpdate for an error message
+        emit errorMessage(i18nc("@info:status", "Update of version information failed."));
+        return;
+    }
+
+    // QAbstractItemModel::setData() triggers a bottleneck in combination with QListView
+    // (a detailed description of the root cause is given in the class KFilePreviewGenerator
+    // from kdelibs). To bypass this bottleneck, the signals of the model are temporary blocked.
+    // This works as the update of the data does not require a relayout of the views used in Dolphin.
+    const bool signalsBlocked = m_dolphinModel->signalsBlocked();
+    m_dolphinModel->blockSignals(true);
+
+    const QList<ItemState> itemStates = m_updateItemStatesThread->itemStates();
+    foreach (const ItemState& itemState, itemStates) {
+        m_dolphinModel->setData(itemState.index,
+                                QVariant(static_cast<int>(itemState.version)),
+                                Qt::DecorationRole);
+    }
+
+    m_dolphinModel->blockSignals(signalsBlocked);
+    m_view->viewport()->repaint();
+
+    if (!m_silentUpdate) {
+        // Using an empty message results in clearing the previously shown information message and showing
+        // the default status bar information. This is useful as the user already gets feedback that the
+        // operation has been completed because of the icon emblems.
+        emit operationCompletedMessage(QString());
+    }
+
+    if (m_pendingItemStatesUpdate) {
+        m_pendingItemStatesUpdate = false;
+        updateItemStates();
+    }
+}
+
+void VersionControlObserver::updateItemStates()
+{
+    Q_ASSERT(m_plugin != 0);
+    if (m_updateItemStatesThread == 0) {
+        m_updateItemStatesThread = new UpdateItemStatesThread();
+        connect(m_updateItemStatesThread, SIGNAL(finished()),
+                this, SLOT(slotThreadFinished()));
+    }
+    if (m_updateItemStatesThread->isRunning()) {
+        // An update is currently ongoing. Wait until the thread has finished
+        // the update (see slotThreadFinished()).
+        m_pendingItemStatesUpdate = true;
+        return;
+    }
+
+    QList<ItemState> itemStates;
+    addDirectory(QModelIndex(), itemStates);
+    if (!itemStates.isEmpty()) {
+        if (!m_silentUpdate) {
+            emit infoMessage(i18nc("@info:status", "Updating version information..."));
+        }
+        m_updateItemStatesThread->setData(m_plugin, itemStates);
+        m_updateItemStatesThread->start(); // slotThreadFinished() is called when finished
+    }
+}
+
+void VersionControlObserver::addDirectory(const QModelIndex& parentIndex, QList<ItemState>& itemStates)
+{
+    const int rowCount = m_dolphinModel->rowCount(parentIndex);
+    for (int row = 0; row < rowCount; ++row) {
+        const QModelIndex index = m_dolphinModel->index(row, DolphinModel::Version, parentIndex);
+        addDirectory(index, itemStates);
+
+        ItemState itemState;
+        itemState.index = index;
+        itemState.item = m_dolphinModel->itemForIndex(index);
+        itemState.version = KVersionControlPlugin::UnversionedVersion;
+
+        itemStates.append(itemState);
+    }
+}
+
+KVersionControlPlugin* VersionControlObserver::searchPlugin(const KUrl& directory) const
+{
+    static bool pluginsAvailable = true;
+    static QList<KVersionControlPlugin*> plugins;
+
+    if (!pluginsAvailable) {
+        // A searching for plugins has already been done, but no
+        // plugins are installed
+        return 0;
+    }
+
+    if (plugins.isEmpty()) {
+        // No searching for plugins has been done yet. Query the KServiceTypeTrader for
+        // all fileview version control plugins and remember them in 'plugins'.
+        const QStringList enabledPlugins = VersionControlSettings::enabledPlugins();
+
+        const KService::List pluginServices = KServiceTypeTrader::self()->query("FileViewVersionControlPlugin");
+        for (KService::List::ConstIterator it = pluginServices.constBegin(); it != pluginServices.constEnd(); ++it) {
+            if (enabledPlugins.contains((*it)->name())) {
+                KVersionControlPlugin* plugin = (*it)->createInstance<KVersionControlPlugin>();
+                Q_ASSERT(plugin != 0);
+                plugins.append(plugin);
+            }
+        }
+        if (plugins.isEmpty()) {
+            pluginsAvailable = false;
+            return 0;
+        }
+    }
+
+    // Verify whether the current directory contains revision information
+    // like .svn, .git, ...
+    foreach (KVersionControlPlugin* plugin, plugins) {
+        // Use the KDirLister cache to check for .svn, .git, ... files
+        KUrl dirUrl(directory);
+        KUrl fileUrl = dirUrl;
+        fileUrl.addPath(plugin->fileName());
+        const KFileItem item = m_dirLister->findByUrl(fileUrl);
+        if (!item.isNull()) {
+            return plugin;
+        }
+
+        // Version control systems like Git provide the version information
+        // file only in the root directory. Check whether the version information file can
+        // be found in one of the parent directories. For performance reasons this
+        // step is only done, if the previous directory was marked as versioned by
+        // m_versionedDirectory. Drawback: Until e. g. Git is recognized, the root directory
+        // must be shown at least once.
+        if (m_versionedDirectory) {
+            KUrl upUrl = dirUrl.upUrl();
+            while (upUrl != dirUrl) {
+                const QString filePath = dirUrl.pathOrUrl(KUrl::AddTrailingSlash) + plugin->fileName();
+                QFileInfo file(filePath);
+                if (file.exists()) {
+                    return plugin;
+                }
+                dirUrl = upUrl;
+                upUrl = dirUrl.upUrl();
+            }
+        }
+    }
+
+    return 0;
+}
+
+bool VersionControlObserver::isVersioned() const
+{
+    return m_dolphinModel->hasVersionData() && (m_plugin != 0);
+}
+
+#include "versioncontrolobserver.moc"
diff --git a/src/views/versioncontrol/versioncontrolobserver.h b/src/views/versioncontrol/versioncontrolobserver.h
new file mode 100644
index 000000000..08bb234b3
--- /dev/null
+++ b/src/views/versioncontrol/versioncontrolobserver.h
@@ -0,0 +1,149 @@
+/***************************************************************************
+ *   Copyright (C) 2009 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#ifndef REVISIONCONTROLOBSERVER_H
+#define REVISIONCONTROLOBSERVER_H
+
+#include <libdolphin_export.h>
+
+#include <kfileitem.h>
+#include <kversioncontrolplugin.h>
+#include <QList>
+#include <QMutex>
+#include <QObject>
+#include <QPersistentModelIndex>
+#include <QString>
+
+class DolphinModel;
+class KDirLister;
+class KFileItemList;
+class QAbstractItemView;
+class QAction;
+class QTimer;
+class UpdateItemStatesThread;
+
+/**
+ * @brief Observes all version control plugins.
+ *
+ * The item view gets updated automatically if the currently shown
+ * directory is under version control.
+ *
+ * @see VersionControlPlugin
+ */
+class LIBDOLPHINPRIVATE_EXPORT VersionControlObserver : public QObject
+{
+    Q_OBJECT
+
+public:
+    VersionControlObserver(QAbstractItemView* view);
+    virtual ~VersionControlObserver();
+
+    QList<QAction*> contextMenuActions(const KFileItemList& items) const;
+    QList<QAction*> contextMenuActions(const QString& directory) const;
+    
+signals:
+    /**
+     * Is emitted if an information message with the content \a msg
+     * should be shown.
+     */
+    void infoMessage(const QString& msg);
+
+    /**
+     * Is emitted if an error message with the content \a msg
+     * should be shown.
+     */
+    void errorMessage(const QString& msg);
+
+    /**
+     * Is emitted if an "operation completed" message with the content \a msg
+     * should be shown.
+     */
+    void operationCompletedMessage(const QString& msg);
+    
+private slots:
+    /**
+     * Invokes verifyDirectory() with a small delay. If delayedDirectoryVerification()
+     * is invoked before the delay has been exceeded, the delay will be reset. This
+     * assures that a lot of short requests for directory verification only result
+     * in one (expensive) call.
+     */
+    void delayedDirectoryVerification();
+
+    /**
+     * Invokes verifyDirectory() with a small delay. In opposite to
+     * delayedDirectoryVerification() it and assures that the verification of
+     * the directory is done silently without information messages.
+     */
+    void silentDirectoryVerification();    
+
+    void verifyDirectory();
+
+    /**
+     * Is invoked if the thread m_updateItemStatesThread has been finished
+     * and applys the item states.
+     */
+    void slotThreadFinished();
+    
+private:
+    struct ItemState
+    {
+        QPersistentModelIndex index;
+        KFileItem item;
+        KVersionControlPlugin::VersionState version;
+    };
+
+    void updateItemStates();
+
+    /**
+     * Adds recursively all items from the directory \p parentIndex into
+     * the list \p itemStates.
+     */
+    void addDirectory(const QModelIndex& parentIndex, QList<ItemState>& itemStates);
+
+    /**
+     * Returns a matching plugin for the given directory.
+     * 0 is returned, if no matching plugin has been found.
+     */
+    KVersionControlPlugin* searchPlugin(const KUrl& directory) const;
+
+    /**
+     * Returns true, if the directory contains a version control information.
+     */
+    bool isVersioned() const;
+
+private:
+    bool m_pendingItemStatesUpdate;
+    bool m_versionedDirectory;
+    bool m_silentUpdate; // if true, no messages will be send during the update
+                         // of version states
+    
+    QAbstractItemView* m_view;
+    KDirLister* m_dirLister;
+    DolphinModel* m_dolphinModel;
+    
+    QTimer* m_dirVerificationTimer;
+
+    KVersionControlPlugin* m_plugin;
+    UpdateItemStatesThread* m_updateItemStatesThread;
+
+    friend class UpdateItemStatesThread;
+};
+
+#endif // REVISIONCONTROLOBSERVER_H
+