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

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

11 files changed, 1501 insertions, 0 deletions

diff --git a/src/views/tooltips/filemetadatatooltip.cpp b/src/views/tooltips/filemetadatatooltip.cpp
new file mode 100644
index 000000000..d6e0c36aa
--- /dev/null
+++ b/src/views/tooltips/filemetadatatooltip.cpp
@@ -0,0 +1,159 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Peter Penz <[email protected]>                  *
+ *   Copyright (C) 2008 by Fredrik Höglund <[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 "filemetadatatooltip.h"
+
+#include <kcolorscheme.h>
+#include <kfilemetadatawidget.h>
+#include <kseparator.h>
+#include <kwindowsystem.h>
+
+#include <QLabel>
+#include <QPainter>
+#include <QVBoxLayout>
+
+FileMetaDataToolTip::FileMetaDataToolTip(QWidget* parent) :
+    QWidget(parent),
+    m_preview(0),
+    m_name(0),
+    m_fileMetaDataWidget(0)
+
+{
+    setAttribute(Qt::WA_TranslucentBackground);
+    setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint);
+
+    // Create widget for file preview
+    m_preview = new QLabel(this);
+
+    // Create widget for file name
+    m_name = new QLabel(this);
+    QFont font = m_name->font();
+    font.setBold(true);
+    m_name->setFont(font);
+    m_name->setAlignment(Qt::AlignHCenter);
+
+    // Create widget for the meta data
+    m_fileMetaDataWidget = new KFileMetaDataWidget();
+    m_fileMetaDataWidget->setForegroundRole(QPalette::ToolTipText);
+    m_fileMetaDataWidget->setReadOnly(true);
+
+    // The stretchwidget allows the metadata widget to be top aligned and fills
+    // the remaining vertical space
+    QWidget* stretchWidget = new QWidget(this);
+    stretchWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::MinimumExpanding);
+
+    QWidget* textContainer = new QWidget(this);
+    QVBoxLayout* textLayout = new QVBoxLayout(textContainer);
+    textLayout->addWidget(m_name);
+    textLayout->addWidget(new KSeparator());
+    textLayout->addWidget(m_fileMetaDataWidget);
+    textLayout->addWidget(stretchWidget);
+
+    QHBoxLayout* tipLayout = new QHBoxLayout(this);
+    tipLayout->addWidget(m_preview);
+    tipLayout->addWidget(textContainer);
+    
+    tipLayout->setSizeConstraint(QLayout::SetFixedSize);
+}
+
+FileMetaDataToolTip::~FileMetaDataToolTip()
+{
+}
+
+void FileMetaDataToolTip::setPreview(const QPixmap& pixmap)
+{
+    m_preview->setPixmap(pixmap);
+}
+
+const QPixmap* FileMetaDataToolTip::preview() const
+{
+    return m_preview->pixmap();
+}
+
+void FileMetaDataToolTip::setName(const QString& name)
+{
+    m_name->setText(name);
+}
+
+QString FileMetaDataToolTip::name() const
+{
+    return m_name->text();
+}
+
+void FileMetaDataToolTip::setItems(const KFileItemList& items)
+{
+    m_fileMetaDataWidget->setItems(items);
+}
+
+KFileItemList FileMetaDataToolTip::items() const
+{
+    return m_fileMetaDataWidget->items();
+}
+
+void FileMetaDataToolTip::paintEvent(QPaintEvent* event)
+{
+    Q_UNUSED(event);
+
+    QPainter painter(this);
+
+    QColor toColor = palette().brush(QPalette::ToolTipBase).color();
+    QColor fromColor = KColorScheme::shade(toColor, KColorScheme::LightShade, 0.2);
+
+    const bool haveAlphaChannel = KWindowSystem::compositingActive();
+    if (haveAlphaChannel) {
+        painter.setRenderHint(QPainter::Antialiasing);
+        painter.translate(0.5, 0.5);
+        toColor.setAlpha(220);
+        fromColor.setAlpha(220);
+    }
+
+    QLinearGradient gradient(QPointF(0.0, 0.0), QPointF(0.0, height()));
+    gradient.setColorAt(0.0, fromColor);
+    gradient.setColorAt(1.0, toColor);
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(gradient);
+
+    const QRect rect(0, 0, width(), height());
+    if (haveAlphaChannel) {
+        const qreal radius = 5.0;
+
+        QPainterPath path;
+        path.moveTo(rect.left(), rect.top() + radius);
+        arc(path, rect.left()  + radius, rect.top()    + radius, radius, 180, -90);
+        arc(path, rect.right() - radius, rect.top()    + radius, radius,  90, -90);
+        arc(path, rect.right() - radius, rect.bottom() - radius, radius,   0, -90);
+        arc(path, rect.left()  + radius, rect.bottom() - radius, radius, 270, -90);
+        path.closeSubpath();
+
+        painter.drawPath(path);
+    } else {
+        painter.drawRect(rect);
+    }
+}
+
+void FileMetaDataToolTip::arc(QPainterPath& path,
+                              qreal cx, qreal cy,
+                              qreal radius, qreal angle,
+                              qreal sweepLength)
+{
+    path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweepLength);
+}
+
+#include "filemetadatatooltip.moc"
diff --git a/src/views/tooltips/filemetadatatooltip.h b/src/views/tooltips/filemetadatatooltip.h
new file mode 100644
index 000000000..d5356cd23
--- /dev/null
+++ b/src/views/tooltips/filemetadatatooltip.h
@@ -0,0 +1,70 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Peter Penz <[email protected]>                  *
+ *   Copyright (C) 2008 by Fredrik Höglund <[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 DOLPHINCONTROLLER_H
+#define DOLPHINCONTROLLER_H
+
+#include <QWidget>
+
+class KFileItemList;
+class KFileMetaDataWidget;
+class QLabel;
+
+/**
+ * @brief Tooltip, that shows the meta information and a preview of one
+ *        or more files.
+ */
+class FileMetaDataToolTip : public QWidget
+{
+    Q_OBJECT
+
+public:
+    FileMetaDataToolTip(QWidget* parent = 0);
+    virtual ~FileMetaDataToolTip();
+
+    void setPreview(const QPixmap& pixmap);
+    const QPixmap* preview() const;
+
+    void setName(const QString& name);
+    QString name() const;
+
+    void setItems(const KFileItemList& items);
+    KFileItemList items() const;
+
+protected:
+    virtual void paintEvent(QPaintEvent* event);
+
+private:
+    /**
+     * Helper method for FileMetaDataToolTip::paintEvent() to adjust the painter path \p path
+     * by rounded corners.
+     */
+    static void arc(QPainterPath& path,
+                    qreal cx, qreal cy,
+                    qreal radius, qreal angle,
+                    qreal sweepLength);
+
+private:
+    QLabel* m_preview;
+    QLabel* m_name;
+    KFileMetaDataWidget* m_fileMetaDataWidget;
+};
+
+#endif
diff --git a/src/views/tooltips/tooltipmanager.cpp b/src/views/tooltips/tooltipmanager.cpp
new file mode 100644
index 000000000..726aed9f3
--- /dev/null
+++ b/src/views/tooltips/tooltipmanager.cpp
@@ -0,0 +1,277 @@
+/*******************************************************************************
+ *   Copyright (C) 2008 by Konstantin Heil <[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 "tooltipmanager.h"
+
+#include "filemetadatatooltip.h"
+#include <kicon.h>
+#include <kio/previewjob.h>
+#include <kwindowsystem.h>
+
+#include <QApplication>
+#include <QDesktopWidget>
+#include <QScrollArea>
+#include <QScrollBar>
+#include <QTimer>
+
+#include <views/dolphinmodel.h>
+#include <views/dolphinsortfilterproxymodel.h>
+
+ToolTipManager::ToolTipManager(QAbstractItemView* parent,
+                               DolphinSortFilterProxyModel* model) :
+    QObject(parent),
+    m_view(parent),
+    m_dolphinModel(0),
+    m_proxyModel(model),
+    m_prepareToolTipTimer(0),
+    m_startPreviewJobTimer(0),
+    m_waitOnPreviewTimer(0),
+    m_showToolTipDelayedTimer(0),
+    m_fileMetaDataToolTip(0),
+    m_item(),
+    m_itemRect(),
+    m_generatingPreview(false),
+    m_hasDefaultIcon(false),
+    m_previewPixmap()
+{
+    static FileMetaDataToolTip* sharedToolTip = 0;
+    if (sharedToolTip == 0) {
+        sharedToolTip = new FileMetaDataToolTip();
+        // TODO: Using K_GLOBAL_STATIC would be preferable to maintain the
+        // instance, but the cleanup of KFileMetaDataWidget at this stage does
+        // not work.
+    }
+    m_fileMetaDataToolTip = sharedToolTip;
+    
+    m_dolphinModel = static_cast<DolphinModel*>(m_proxyModel->sourceModel());
+    connect(parent, SIGNAL(entered(const QModelIndex&)),
+            this, SLOT(requestToolTip(const QModelIndex&)));
+    connect(parent, SIGNAL(viewportEntered()),
+            this, SLOT(hideToolTip()));
+
+    // Initialize timers
+    m_prepareToolTipTimer = new QTimer(this);
+    m_prepareToolTipTimer->setSingleShot(true);
+    m_prepareToolTipTimer->setInterval(500);
+    connect(m_prepareToolTipTimer, SIGNAL(timeout()), this, SLOT(prepareToolTip()));   
+    
+    m_startPreviewJobTimer = new QTimer(this);
+    m_startPreviewJobTimer->setSingleShot(true);
+    m_startPreviewJobTimer->setInterval(200);
+    connect(m_startPreviewJobTimer, SIGNAL(timeout()), this, SLOT(startPreviewJob()));
+    
+    m_waitOnPreviewTimer = new QTimer(this);
+    m_waitOnPreviewTimer->setSingleShot(true);
+    m_waitOnPreviewTimer->setInterval(250);     
+    connect(m_waitOnPreviewTimer, SIGNAL(timeout()), this, SLOT(prepareToolTip()));
+
+    m_showToolTipDelayedTimer = new QTimer(this);
+    m_showToolTipDelayedTimer->setSingleShot(true);
+    m_showToolTipDelayedTimer->setInterval(100);     
+    connect(m_showToolTipDelayedTimer, SIGNAL(timeout()), this, SLOT(showToolTip()));
+    
+    // When the mousewheel is used, the items don't get a hovered indication
+    // (Qt-issue #200665). To assure that the tooltip still gets hidden,
+    // the scrollbars are observed.
+    connect(parent->horizontalScrollBar(), SIGNAL(valueChanged(int)),
+            this, SLOT(hideTip()));
+    connect(parent->verticalScrollBar(), SIGNAL(valueChanged(int)),
+            this, SLOT(hideTip()));
+
+    m_view->viewport()->installEventFilter(this);
+    m_view->installEventFilter(this);
+}
+
+ToolTipManager::~ToolTipManager()
+{
+}
+
+void ToolTipManager::hideTip()
+{
+    hideToolTip();
+}
+
+bool ToolTipManager::eventFilter(QObject* watched, QEvent* event)
+{
+    if (watched == m_view->viewport()) {
+        switch (event->type()) {
+        case QEvent::Leave:
+        case QEvent::MouseButtonPress:
+            hideToolTip();
+            break;
+        default:
+            break;
+        }
+    } else if ((watched == m_view) && (event->type() == QEvent::KeyPress)) {
+        hideToolTip();
+    }
+
+    return QObject::eventFilter(watched, event);
+}
+
+void ToolTipManager::requestToolTip(const QModelIndex& index)
+{
+    hideToolTip();
+    
+    // Only request a tooltip for the name column and when no selection or
+    // drag & drop operation is done (indicated by the left mouse button)
+    if ((index.column() == DolphinModel::Name) && !(QApplication::mouseButtons() & Qt::LeftButton)) {
+        m_itemRect = m_view->visualRect(index);
+        const QPoint pos = m_view->viewport()->mapToGlobal(m_itemRect.topLeft());
+        m_itemRect.moveTo(pos);
+
+        const QModelIndex dirIndex = m_proxyModel->mapToSource(index);
+        m_item = m_dolphinModel->itemForIndex(dirIndex);
+
+        // Only start the previewJob when the mouse has been over this item for 200 milliseconds.
+        // This prevents a lot of useless preview jobs when passing rapidly over a lot of items.
+        m_startPreviewJobTimer->start();
+        m_previewPixmap = QPixmap();
+        m_hasDefaultIcon = false;
+
+        m_prepareToolTipTimer->start();
+    }
+}
+
+void ToolTipManager::hideToolTip()
+{
+    m_prepareToolTipTimer->stop();
+    m_startPreviewJobTimer->stop();
+    m_waitOnPreviewTimer->stop();
+    m_showToolTipDelayedTimer->stop();
+
+    m_fileMetaDataToolTip->hide();
+}
+
+void ToolTipManager::prepareToolTip()
+{
+    if (m_generatingPreview) {
+        m_waitOnPreviewTimer->start();
+    }
+
+    if (!m_previewPixmap.isNull()) {
+        showToolTipDelayed(m_previewPixmap);
+    } else if (!m_hasDefaultIcon) {
+        const QPixmap image(KIcon(m_item.iconName()).pixmap(128, 128));
+        showToolTipDelayed(image);
+        m_hasDefaultIcon = true;
+    }
+}
+
+void ToolTipManager::startPreviewJob()
+{
+    m_generatingPreview = true;
+    KIO::PreviewJob* job = KIO::filePreview(KFileItemList() << m_item, 256, 256);
+
+    connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
+            this, SLOT(setPreviewPix(const KFileItem&, const QPixmap&)));
+    connect(job, SIGNAL(failed(const KFileItem&)),
+            this, SLOT(previewFailed()));
+}
+
+
+void ToolTipManager::setPreviewPix(const KFileItem& item,
+                                   const QPixmap& pixmap)
+{
+    if ((m_item.url() != item.url()) || pixmap.isNull()) {
+        // An old preview or an invalid preview has been received
+        previewFailed();
+    } else {
+        m_previewPixmap = pixmap;
+        m_generatingPreview = false;
+    }
+}
+
+void ToolTipManager::previewFailed()
+{
+    m_generatingPreview = false;
+}
+
+void ToolTipManager::showToolTip()
+{
+    const QRect desktop = QApplication::desktop()->screenGeometry(m_itemRect.bottomRight());
+    const QSize size = m_fileMetaDataToolTip->sizeHint();
+    
+    // m_itemRect defines the area of the item, where the tooltip should be
+    // shown. Per default the tooltip is shown in the bottom right corner.
+    // If the tooltip content exceeds the desktop borders, it must be assured that:
+    // - the content is fully visible
+    // - the content is not drawn inside m_itemRect
+    const bool hasRoomToLeft  = (m_itemRect.left()   - size.width()  >= desktop.left());
+    const bool hasRoomToRight = (m_itemRect.right()  + size.width()  <= desktop.right());
+    const bool hasRoomAbove   = (m_itemRect.top()    - size.height() >= desktop.top());
+    const bool hasRoomBelow   = (m_itemRect.bottom() + size.height() <= desktop.bottom());
+    if (!hasRoomAbove && !hasRoomBelow && !hasRoomToLeft && !hasRoomToRight) {
+        return;
+    }
+    
+    int x = 0;
+    int y = 0;
+    if (hasRoomBelow || hasRoomAbove) {
+        x = QCursor::pos().x() + 16; // TODO: use mouse pointer width instead of the magic value of 16
+        if (x + size.width() >= desktop.right()) {
+            x = desktop.right() - size.width();
+        }
+        if (hasRoomBelow) {
+            y = m_itemRect.bottom() + 1;
+        } else {
+            y = m_itemRect.top() - size.height();
+        }
+    } else {
+        Q_ASSERT(hasRoomToLeft || hasRoomToRight);
+        if (hasRoomToRight) {
+            x = m_itemRect.right() + 1;
+        } else {
+            x = m_itemRect.left() - size.width();
+        }
+
+        // Put the tooltip at the bottom of the screen. The x-coordinate has already
+        // been adjusted, so that no overlapping with m_itemRect occurs.
+        y = desktop.bottom() - size.height();
+    }
+    
+    m_fileMetaDataToolTip->move(qMax(x, 0), qMax(y, 0));
+    m_fileMetaDataToolTip->show();
+}
+
+void ToolTipManager::showToolTipDelayed(const QPixmap& pixmap)
+{
+    if (QApplication::mouseButtons() & Qt::LeftButton) {
+        return;
+    }
+    
+    m_fileMetaDataToolTip->setPreview(pixmap);
+    m_fileMetaDataToolTip->setName(m_item.text());
+    m_fileMetaDataToolTip->setItems(KFileItemList() << m_item);
+
+    // Because one tooltip instance is reused, the size hint always depends on the previous
+    // content (QWidgets don't update their layout geometry if they are invisible). To
+    // assure having a consistent size without relayout flickering, the tooltip is opened
+    // on an invisible position first. This gives the layout system some time to asynchronously
+    // update the content. Sadly this only works with compositing enabled.
+    if (KWindowSystem::compositingActive()) {
+        const QRect desktop = QApplication::desktop()->screenGeometry(m_itemRect.bottomRight());
+        m_fileMetaDataToolTip->move(desktop.bottomRight());
+        m_fileMetaDataToolTip->show();
+    }
+    
+    m_showToolTipDelayedTimer->start(); // Calls ToolTipManager::showToolTip()
+}
+
+#include "tooltipmanager.moc"
diff --git a/src/views/tooltips/tooltipmanager.h b/src/views/tooltips/tooltipmanager.h
new file mode 100644
index 000000000..24e72f28b
--- /dev/null
+++ b/src/views/tooltips/tooltipmanager.h
@@ -0,0 +1,106 @@
+/*******************************************************************************
+ *   Copyright (C) 2008 by Konstantin Heil <[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 TOOLTIPMANAGER_H
+#define TOOLTIPMANAGER_H
+
+#include <QObject>
+#include <QRect>
+
+#include <kfileitem.h>
+
+class DolphinModel;
+class DolphinSortFilterProxyModel;
+class FileMetaDataToolTip;
+class QAbstractItemView;
+class QModelIndex;
+class QTimer;
+
+/**
+ * @brief Manages the tooltips for an item view.
+ *
+ * When hovering an item, a tooltip is shown after
+ * a short timeout. The tooltip is hidden again when the
+ * viewport is hovered or the item view has been left.
+ */
+class ToolTipManager : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit ToolTipManager(QAbstractItemView* parent,
+                            DolphinSortFilterProxyModel* model);
+    virtual ~ToolTipManager();
+
+public slots:
+    /**
+     * Hides the currently shown tooltip. Invoking this method is
+     * only needed when the tooltip should be hidden although
+     * an item is hovered.
+     */
+    void hideTip();
+
+protected:
+    virtual bool eventFilter(QObject* watched, QEvent* event);
+
+private slots:
+    void requestToolTip(const QModelIndex& index);
+    void hideToolTip();
+    void prepareToolTip();
+    void startPreviewJob();
+    void setPreviewPix(const KFileItem& item, const QPixmap& pix);
+    void previewFailed();
+    void showToolTip();
+    
+private:
+    void showToolTipDelayed(const QPixmap& pixmap);
+
+private:
+    QAbstractItemView* m_view;
+    DolphinModel* m_dolphinModel;
+    DolphinSortFilterProxyModel* m_proxyModel;
+
+    /// Timeout from requesting a tooltip until the tooltip is shown
+    QTimer* m_prepareToolTipTimer;
+    
+    /// Timeout from requesting a tooltip until starting a job to
+    /// create a preview pixmap. The preview job is started before
+    /// m_prepareToolTipTimer has been exceeded, to have the preview
+    /// pixmap ideally before the tooltip will be shown.
+    QTimer* m_startPreviewJobTimer;
+    
+    /// Don't show the tooltip, before the preview has been received. The
+    /// time indicates the interval, when the check for a received
+    /// is done.
+    QTimer* m_waitOnPreviewTimer;
+    
+    /// The tooltip is shown slightly delayed to prevent a flickering
+    /// because of layouting the content.
+    QTimer* m_showToolTipDelayedTimer;
+
+    FileMetaDataToolTip* m_fileMetaDataToolTip;
+
+    KFileItem m_item;
+    QRect m_itemRect;
+    bool m_generatingPreview;
+    bool m_hasDefaultIcon;
+    QPixmap m_previewPixmap;
+};
+
+#endif
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
+