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[dolphin.git] / src / dolphinview.cpp

/***************************************************************************
 *   Copyright (C) 2006 by Peter Penz <peter.penz@gmx.at>                  *
 *   Copyright (C) 2006 by Gregor Kališnik <gregor@podnapisi.net>          *
 *                                                                         *
 *   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 "dolphinview.h"

#include <assert.h>

#include <QItemSelectionModel>
#include <Q3ValueList>  // TODO
#include <QDropEvent>
#include <QMouseEvent>
#include <QVBoxLayout>

#include <kdirmodel.h>
#include <kfileitemdelegate.h>
#include <klocale.h>
#include <kio/netaccess.h>
#include <kio/renamedialog.h>
#include <kmimetyperesolver.h>
#include <konq_operations.h>
#include <kurl.h>

#include "dolphinstatusbar.h"
#include "dolphinmainwindow.h"
#include "dolphindirlister.h"
#include "dolphinsortfilterproxymodel.h"
#include "dolphindetailsview.h"
#include "dolphiniconsview.h"
#include "dolphincontextmenu.h"
#include "filterbar.h"
#include "progressindicator.h"
#include "renamedialog.h"
#include "urlnavigator.h"
#include "viewproperties.h"

DolphinView::DolphinView(DolphinMainWindow *mainWindow,
                         QWidget *parent,
                         const KUrl& url,
                         Mode mode,
                         bool showHiddenFiles) :
    QWidget(parent),
    m_refreshing(false),
    m_showProgress(false),
    m_mode(mode),
    m_iconSize(0),
    m_folderCount(0),
    m_fileCount(0),
    m_mainWindow(mainWindow),
    m_topLayout(0),
    m_urlNavigator(0),
    m_iconsView(0),
    m_detailsView(0),
    m_filterBar(0),
    m_statusBar(0),
    m_dirModel(0),
    m_dirLister(0),
    m_proxyModel(0)
{
    hide();
    setFocusPolicy(Qt::StrongFocus);
    m_topLayout = new QVBoxLayout(this);
    m_topLayout->setSpacing(0);
    m_topLayout->setMargin(0);

    m_urlNavigator = new UrlNavigator(url, this);
    connect(m_urlNavigator, SIGNAL(urlChanged(const KUrl&)),
            this, SLOT(loadDirectory(const KUrl&)));

    m_statusBar = new DolphinStatusBar(this);

    m_dirLister = new DolphinDirLister();
    m_dirLister->setAutoUpdate(true);
    m_dirLister->setMainWindow(this);
    m_dirLister->setShowingDotFiles(showHiddenFiles);
    m_dirLister->setDelayedMimeTypes(true);

    connect(m_dirLister, SIGNAL(clear()),
            this, SLOT(slotClear()));
    connect(m_dirLister, SIGNAL(percent(int)),
            this, SLOT(slotPercent(int)));
    connect(m_dirLister, SIGNAL(deleteItem(KFileItem*)),
            this, SLOT(slotDeleteItem(KFileItem*)));
    connect(m_dirLister, SIGNAL(completed()),
            this, SLOT(slotCompleted()));
    connect(m_dirLister, SIGNAL(infoMessage(const QString&)),
            this, SLOT(slotInfoMessage(const QString&)));
    connect(m_dirLister, SIGNAL(errorMessage(const QString&)),
            this, SLOT(slotErrorMessage(const QString&)));

    m_dirModel = new KDirModel();
    m_dirModel->setDirLister(m_dirLister);
    m_dirModel->setDropsAllowed(KDirModel::DropOnDirectory);

    m_proxyModel = new DolphinSortFilterProxyModel(this);
    m_proxyModel->setSourceModel(m_dirModel);

    createView();

    m_iconSize = K3Icon::SizeMedium;

    m_filterBar = new FilterBar(this);
    m_filterBar->hide();
    connect(m_filterBar, SIGNAL(filterChanged(const QString&)),
           this, SLOT(slotChangeNameFilter(const QString&)));
    connect(m_filterBar, SIGNAL(closed()),
            this, SLOT(closeFilterBar()));

    m_topLayout->addWidget(m_urlNavigator);
    m_topLayout->addWidget(itemView());
    m_topLayout->addWidget(m_filterBar);
    m_topLayout->addWidget(m_statusBar);

    loadDirectory(m_urlNavigator->url());
}

DolphinView::~DolphinView()
{
    delete m_dirLister;
    m_dirLister = 0;
}

void DolphinView::setUrl(const KUrl& url)
{
    m_urlNavigator->setUrl(url);
}

const KUrl& DolphinView::url() const
{
    return m_urlNavigator->url();
}

void DolphinView::requestActivation()
{
    mainWindow()->setActiveView(this);
}

bool DolphinView::isActive() const
{
    return (mainWindow()->activeView() == this);
}

void DolphinView::setMode(Mode mode)
{
    if (mode == m_mode) {
        return;         // the wished mode is already set
    }

    m_mode = mode;

    ViewProperties props(m_urlNavigator->url());
    props.setViewMode(m_mode);

    createView();
    startDirLister(m_urlNavigator->url());

    emit modeChanged();
}

DolphinView::Mode DolphinView::mode() const
{
    return m_mode;
}

void DolphinView::setShowPreview(bool show)
{
    ViewProperties props(m_urlNavigator->url());
    props.setShowPreview(show);

    // TODO: wait until previews are possible with KFileItemDelegate

    emit showPreviewChanged();
}

bool DolphinView::showPreview() const
{
    // TODO: wait until previews are possible with KFileItemDelegate
    return true;
}

void DolphinView::setShowHiddenFiles(bool show)
{
    if (m_dirLister->showingDotFiles() == show) {
        return;
    }

    ViewProperties props(m_urlNavigator->url());
    props.setShowHiddenFiles(show);
    props.save();

    m_dirLister->setShowingDotFiles(show);

    emit showHiddenFilesChanged();

    reload();
}

bool DolphinView::showHiddenFiles() const
{
    return m_dirLister->showingDotFiles();
}

void DolphinView::renameSelectedItems()
{
    const KUrl::List urls = selectedUrls();
    if (urls.count() > 1) {
        // More than one item has been selected for renaming. Open
        // a rename dialog and rename all items afterwards.
        RenameDialog dialog(urls);
        if (dialog.exec() == QDialog::Rejected) {
            return;
        }

        DolphinView* view = mainWindow()->activeView();
        const QString& newName = dialog.newName();
        if (newName.isEmpty()) {
            view->statusBar()->setMessage(i18n("The new item name is invalid."),
                                          DolphinStatusBar::Error);
        }
        else {
            // TODO: check how this can be integrated into KonqUndoManager/KonqOperations

            //UndoManager& undoMan = UndoManager::instance();
            //undoMan.beginMacro();

            assert(newName.contains('#'));

            const int urlsCount = urls.count();
            ProgressIndicator* progressIndicator =
                new  ProgressIndicator(mainWindow(),
                                       i18n("Renaming items..."),
                                       i18n("Renaming finished."),
                                       urlsCount);

            // iterate through all selected items and rename them...
            const int replaceIndex = newName.indexOf('#');
            assert(replaceIndex >= 0);
            for (int i = 0; i < urlsCount; ++i) {
                const KUrl& source = urls[i];
                QString name(newName);
                name.replace(replaceIndex, 1, renameIndexPresentation(i + 1, urlsCount));

                if (source.fileName() != name) {
                    KUrl dest(source.upUrl());
                    dest.addPath(name);

                    const bool destExists = KIO::NetAccess::exists(dest, false, view);
                    if (destExists) {
                        delete progressIndicator;
                        progressIndicator = 0;
                        view->statusBar()->setMessage(i18n("Renaming failed (item '%1' already exists).",name),
                                                      DolphinStatusBar::Error);
                        break;
                    }
                    else if (KIO::NetAccess::file_move(source, dest)) {
                        // TODO: From the users point of view he executed one 'rename n files' operation,
                        // but internally we store it as n 'rename 1 file' operations for the undo mechanism.
                        //DolphinCommand command(DolphinCommand::Rename, source, dest);
                        //undoMan.addCommand(command);
                    }
                }

                progressIndicator->execOperation();
            }
            delete progressIndicator;
            progressIndicator = 0;

            //undoMan.endMacro();
        }
    }
    else {
        // Only one item has been selected for renaming. Use the custom
        // renaming mechanism from the views.
        assert(urls.count() == 1);
        // TODO:
        /*if (m_mode == DetailsView) {
            Q3ListViewItem* item = m_iconsView->firstChild();
            while (item != 0) {
                if (item->isSelected()) {
                    m_iconsView->rename(item, DolphinDetailsView::NameColumn);
                    break;
                }
                item = item->nextSibling();
            }
        }
        else {
            KFileIconViewItem* item = static_cast<KFileIconViewItem*>(m_iconsView->firstItem());
            while (item != 0) {
                if (item->isSelected()) {
                    item->rename();
                    break;
                }
                item = static_cast<KFileIconViewItem*>(item->nextItem());
            }
        }*/
    }
}

void DolphinView::selectAll()
{
    selectAll(QItemSelectionModel::Select);
}

void DolphinView::invertSelection()
{
    selectAll(QItemSelectionModel::Toggle);
}

DolphinStatusBar* DolphinView::statusBar() const
{
    return m_statusBar;
}

int DolphinView::contentsX() const
{

    return 0; //scrollView()->contentsX();
}

int DolphinView::contentsY() const
{
    return 0; //scrollView()->contentsY();
}

void DolphinView::refreshSettings()
{
    startDirLister(m_urlNavigator->url());
}

void DolphinView::updateStatusBar()
{
    // As the item count information is less important
    // in comparison with other messages, it should only
    // be shown if:
    // - the status bar is empty or
    // - shows already the item count information or
    // - shows only a not very important information
    // - if any progress is given don't show the item count info at all
    const QString msg(m_statusBar->message());
    const bool updateStatusBarMsg = (msg.isEmpty() ||
                                     (msg == m_statusBar->defaultText()) ||
                                     (m_statusBar->type() == DolphinStatusBar::Information)) &&
                                    (m_statusBar->progress() == 100);

    const QString text(hasSelection() ? selectionStatusBarText() : defaultStatusBarText());
    m_statusBar->setDefaultText(text);

    if (updateStatusBarMsg) {
        m_statusBar->setMessage(text, DolphinStatusBar::Default);
    }
}

void DolphinView::emitRequestItemInfo(const KUrl& url)
{
    emit requestItemInfo(url);
}

bool DolphinView::isFilterBarVisible() const
{
  return m_filterBar->isVisible();
}

bool DolphinView::isUrlEditable() const
{
    return m_urlNavigator->isUrlEditable();
}

void DolphinView::zoomIn()
{
    //itemEffectsManager()->zoomIn();
}

void DolphinView::zoomOut()
{
    //itemEffectsManager()->zoomOut();
}

bool DolphinView::isZoomInPossible() const
{
    return false; //itemEffectsManager()->isZoomInPossible();
}

bool DolphinView::isZoomOutPossible() const
{
    return false; //itemEffectsManager()->isZoomOutPossible();
}

void DolphinView::setSorting(Sorting sorting)
{
    if (sorting != this->sorting()) {
        ViewProperties props(url());
        props.setSorting(sorting);

        m_proxyModel->setSorting(sorting);

        emit sortingChanged(sorting);
    }
}

DolphinView::Sorting DolphinView::sorting() const
{
    return m_proxyModel->sorting();
}

void DolphinView::setSortOrder(Qt::SortOrder order)
{
    if (sortOrder() != order) {
        ViewProperties props(url());
        props.setSortOrder(order);

        m_proxyModel->setSortOrder(order);

        emit sortOrderChanged(order);
    }
}

Qt::SortOrder DolphinView::sortOrder() const
{
    return m_proxyModel->sortOrder();
}

void DolphinView::goBack()
{
    m_urlNavigator->goBack();
}

void DolphinView::goForward()
{
    m_urlNavigator->goForward();
}

void DolphinView::goUp()
{
    m_urlNavigator->goUp();
}

void DolphinView::goHome()
{
    m_urlNavigator->goHome();
}

void DolphinView::setUrlEditable(bool editable)
{
    m_urlNavigator->editUrl(editable);
}

const Q3ValueList<UrlNavigator::HistoryElem> DolphinView::urlHistory(int& index) const
{
    return m_urlNavigator->history(index);
}

bool DolphinView::hasSelection() const
{
    return itemView()->selectionModel()->hasSelection();
}

KFileItemList DolphinView::selectedItems() const
{
    const QAbstractItemView* view = itemView();

    // Our view has a selection, we will map them back to the DirModel
    // and then fill the KFileItemList.
    assert((view != 0) && (view->selectionModel() != 0));

    const QItemSelection selection = m_proxyModel->mapSelectionToSource(view->selectionModel()->selection());
    KFileItemList itemList;

    const QModelIndexList indexList = selection.indexes();
    QModelIndexList::const_iterator end = indexList.end();
    for (QModelIndexList::const_iterator it = indexList.begin(); it != end; ++it) {
        assert((*it).isValid());

        KFileItem* item = m_dirModel->itemForIndex(*it);
        if (item != 0) {
            itemList.append(item);
        }
    }

    return itemList;
}

KUrl::List DolphinView::selectedUrls() const
{
    KUrl::List urls;

    const KFileItemList list = selectedItems();
    KFileItemList::const_iterator it = list.begin();
    const KFileItemList::const_iterator end = list.end();
    while (it != end) {
        KFileItem* item = *it;
        urls.append(item->url());
        ++it;
    }

    return urls;
}

const KFileItem* DolphinView::currentFileItem() const
{
    return 0; // fileView()->currentFileItem();
}

void DolphinView::openContextMenu(KFileItem* fileInfo, const QPoint& pos)
{
    DolphinContextMenu contextMenu(this, fileInfo, pos);
    contextMenu.open();
}

void DolphinView::rename(const KUrl& source, const QString& newName)
{
    bool ok = false;

    if (newName.isEmpty() || (source.fileName() == newName)) {
        return;
    }

    KUrl dest(source.upUrl());
    dest.addPath(newName);

    const bool destExists = KIO::NetAccess::exists(dest,
                                                   false,
                                                   mainWindow()->activeView());
    if (destExists) {
        // the destination already exists, hence ask the user
        // how to proceed...
        KIO::RenameDialog renameDialog(this,
                                       i18n("File Already Exists"),
                                       source.path(),
                                       dest.path(),
                                       KIO::M_OVERWRITE);
        switch (renameDialog.exec()) {
            case KIO::R_OVERWRITE:
                // the destination should be overwritten
                ok = KIO::NetAccess::file_move(source, dest, -1, true);
                break;

            case KIO::R_RENAME: {
                // a new name for the destination has been used
                KUrl newDest(renameDialog.newDestUrl());
                ok = KIO::NetAccess::file_move(source, newDest);
                break;
            }

            default:
                // the renaming operation has been canceled
                reload();
                return;
        }
    }
    else {
        // no destination exists, hence just move the file to
        // do the renaming
        ok = KIO::NetAccess::file_move(source, dest);
    }

    const QString destFileName = dest.fileName();
    if (ok) {
        m_statusBar->setMessage(i18n("Renamed file '%1' to '%2'.",source.fileName(), destFileName),
                                DolphinStatusBar::OperationCompleted);

        KonqOperations::rename(this, source, destFileName);
    }
    else {
        m_statusBar->setMessage(i18n("Renaming of file '%1' to '%2' failed.",source.fileName(), destFileName),
                                DolphinStatusBar::Error);
        reload();
    }
}

void DolphinView::reload()
{
    startDirLister(m_urlNavigator->url(), true);
}

void DolphinView::slotUrlListDropped(QDropEvent* /* event */,
                                     const KUrl::List& urls,
                                     const KUrl& url)
{
    KUrl destination(url);
    if (destination.isEmpty()) {
        destination = m_urlNavigator->url();
    }
    else {
        // Check whether the destination Url is a directory. If this is not the
        // case, use the navigator Url as destination (otherwise the destination,
        // which represents a file, would be replaced by a copy- or move-operation).
        KFileItem fileItem(KFileItem::Unknown, KFileItem::Unknown, destination);
        if (!fileItem.isDir()) {
            destination = m_urlNavigator->url();
        }
    }

    mainWindow()->dropUrls(urls, destination);
}

void DolphinView::mouseReleaseEvent(QMouseEvent* event)
{
    QWidget::mouseReleaseEvent(event);
    mainWindow()->setActiveView(this);
}

DolphinMainWindow* DolphinView::mainWindow() const
{
    return m_mainWindow;
}

void DolphinView::loadDirectory(const KUrl& url)
{
    const ViewProperties props(url);

    const Mode mode = props.viewMode();
    if (m_mode != mode) {
        m_mode = mode;
        createView();
        emit modeChanged();
    }

    const bool showHiddenFiles = props.showHiddenFiles();
    if (showHiddenFiles != m_dirLister->showingDotFiles()) {
        m_dirLister->setShowingDotFiles(showHiddenFiles);
        emit showHiddenFilesChanged();
    }

    const DolphinView::Sorting sorting = props.sorting();
    if (sorting != m_proxyModel->sorting()) {
        m_proxyModel->setSorting(sorting);
        emit sortingChanged(sorting);
    }

    const Qt::SortOrder sortOrder = props.sortOrder();
    if (sortOrder != m_proxyModel->sortOrder()) {
        m_proxyModel->setSortOrder(sortOrder);
        emit sortOrderChanged(sortOrder);
    }

    // TODO: handle previews (props.showPreview())

    startDirLister(url);
    emit urlChanged(url);
}

void DolphinView::triggerItem(const QModelIndex& index)
{
    KFileItem* item = m_dirModel->itemForIndex(m_proxyModel->mapToSource(index));
    if (item == 0) {
        return;
    }

    if (item->isDir()) {
        // Prefer the local path over the Url. This assures that the
        // volume space information is correct. Assuming that the Url is media:/sda1,
        // and the local path is /windows/C: For the Url the space info is related
        // to the root partition (and hence wrong) and for the local path the space
        // info is related to the windows partition (-> correct).
        //m_dirLister->stop();
        //m_dirLister->openUrl(item->url());
        //return;

        const QString localPath(item->localPath());
        if (localPath.isEmpty()) {
            setUrl(item->url());
        }
        else {
            setUrl(KUrl(localPath));
        }
    }
    else {
        item->run();
    }
}

void DolphinView::slotPercent(int percent)
{
    if (m_showProgress) {
        m_statusBar->setProgress(percent);
    }
}

void DolphinView::slotClear()
{
    //fileView()->clearView();
    updateStatusBar();
}

void DolphinView::slotDeleteItem(KFileItem* item)
{
    //fileView()->removeItem(item);
    updateStatusBar();
}

void DolphinView::slotCompleted()
{
    m_refreshing = true;

    //KFileView* view = fileView();
    //view->clearView();

    // TODO: in Qt4 the code should get a lot
    // simpler and nicer due to Interview...
    /*if (m_iconsView != 0) {
        m_iconsView->beginItemUpdates();
    }
    if (m_iconsView != 0) {
        m_iconsView->beginItemUpdates();
    }*/

    if (m_showProgress) {
        m_statusBar->setProgressText(QString::null);
        m_statusBar->setProgress(100);
        m_showProgress = false;
    }

    KFileItemList items(m_dirLister->items());
    KFileItemList::const_iterator it = items.begin();
    const KFileItemList::const_iterator end = items.end();

    m_fileCount = 0;
    m_folderCount = 0;

    while (it != end) {
        KFileItem* item = *it;
        //view->insertItem(item);
        if (item->isDir()) {
            ++m_folderCount;
        }
        else {
            ++m_fileCount;
        }
        ++it;
    }

    updateStatusBar();

    /*if (m_iconsView != 0) {
        // Prevent a flickering of the icon view widget by giving a small
        // timeslot to swallow asynchronous update events.
        m_iconsView->setUpdatesEnabled(false);
        QTimer::singleShot(10, this, SLOT(slotDelayedUpdate()));
    }

    if (m_iconsView != 0) {
        m_iconsView->endItemUpdates();
        m_refreshing = false;
    }*/
}

void DolphinView::slotInfoMessage(const QString& msg)
{
    m_statusBar->setMessage(msg, DolphinStatusBar::Information);
}

void DolphinView::slotErrorMessage(const QString& msg)
{
    m_statusBar->setMessage(msg, DolphinStatusBar::Error);
}

void DolphinView::slotGrabActivation()
{
    mainWindow()->setActiveView(this);
}

void DolphinView::emitSelectionChangedSignal()
{
    emit selectionChanged();
}

void DolphinView::closeFilterBar()
{
    m_filterBar->hide();
    emit showFilterBarChanged(false);
}

void DolphinView::slotContentsMoving(int x, int y)
{
    if (!m_refreshing) {
        // Only emit a 'contents moved' signal if the user
        // moved the content by adjusting the sliders. Adjustments
        // resulted by refreshing a directory should not be respected.
        emit contentsMoved(x, y);
    }
}

void DolphinView::startDirLister(const KUrl& url, bool reload)
{
    if (!url.isValid()) {
        const QString location(url.pathOrUrl());
        if (location.isEmpty()) {
            m_statusBar->setMessage(i18n("The location is empty."), DolphinStatusBar::Error);
        }
        else {
            m_statusBar->setMessage(i18n("The location '%1' is invalid.",location),
                                    DolphinStatusBar::Error);
        }
        return;
    }

    // Only show the directory loading progress if the status bar does
    // not contain another progress information. This means that
    // the directory loading progress information has the lowest priority.
    const QString progressText(m_statusBar->progressText());
    m_showProgress = progressText.isEmpty() ||
                     (progressText == i18n("Loading directory..."));
    if (m_showProgress) {
        m_statusBar->setProgressText(i18n("Loading directory..."));
        m_statusBar->setProgress(0);
    }

    m_refreshing = true;
    m_dirLister->stop();
    m_dirLister->openUrl(url, false, reload);
}

QString DolphinView::defaultStatusBarText() const
{
    // TODO: the following code is not suitable for languages where multiple forms
    // of plurals are given (e. g. in Poland three forms of plurals exist).
    const int itemCount = m_folderCount + m_fileCount;

    QString text;
    if (itemCount == 1) {
        text = i18n("1 Item");
    }
    else {
        text = i18n("%1 Items",itemCount);
    }

    text += " (";

    if (m_folderCount == 1) {
        text += i18n("1 Folder");
    }
    else {
        text += i18n("%1 Folders",m_folderCount);
    }

    text += ", ";

    if (m_fileCount == 1) {
        text += i18n("1 File");
    }
    else {
        text += i18n("%1 Files",m_fileCount);
    }

    text += ")";

    return text;
}

QString DolphinView::selectionStatusBarText() const
{
    // TODO: the following code is not suitable for languages where multiple forms
    // of plurals are given (e. g. in Poland three forms of plurals exist).
    QString text;
    const KFileItemList list = selectedItems();
    if (list.isEmpty()) {
        // TODO: assert(!list.isEmpty()) should be used, as this method is only invoked if
        // DolphinView::hasSelection() is true. Inconsistent behavior?
        return QString();
    }

    int fileCount = 0;
    int folderCount = 0;
    KIO::filesize_t byteSize = 0;
    KFileItemList::const_iterator it = list.begin();
    const KFileItemList::const_iterator end = list.end();
    while (it != end){
        KFileItem* item = *it;
        if (item->isDir()) {
            ++folderCount;
        }
        else {
            ++fileCount;
            byteSize += item->size();
        }
        ++it;
    }

    if (folderCount == 1) {
        text = i18n("1 Folder selected");
    }
    else if (folderCount > 1) {
        text = i18n("%1 Folders selected",folderCount);
    }

    if ((fileCount > 0) && (folderCount > 0)) {
        text += ", ";
    }

    const QString sizeText(KIO::convertSize(byteSize));
    if (fileCount == 1) {
        text += i18n("1 File selected (%1)",sizeText);
    }
    else if (fileCount > 1) {
        text += i18n("%1 Files selected (%1)",fileCount,sizeText);
    }

    return text;
}

QString DolphinView::renameIndexPresentation(int index, int itemCount) const
{
    // assure that the string reprentation for all indicess have the same
    // number of characters based on the given number of items
    QString str(QString::number(index));
    int chrCount = 1;
    while (itemCount >= 10) {
        ++chrCount;
        itemCount /= 10;
    }
    str.reserve(chrCount);

    const int insertCount = chrCount - str.length();
    for (int i = 0; i < insertCount; ++i) {
        str.insert(0, '0');
    }
    return str;
}

void DolphinView::slotShowFilterBar(bool show)
{
    assert(m_filterBar != 0);
    if (show) {
        m_filterBar->show();
    }
    else {
        m_filterBar->hide();
    }
}

void DolphinView::declareViewActive()
{
    mainWindow()->setActiveView( this );
}

void DolphinView::slotChangeNameFilter(const QString& nameFilter)
{
    // The name filter of KDirLister does a 'hard' filtering, which
    // means that only the items are shown where the names match
    // exactly the filter. This is non-transparent for the user, which
    // just wants to have a 'soft' filtering: does the name contain
    // the filter string?
    QString adjustedFilter(nameFilter);
    adjustedFilter.insert(0, '*');
    adjustedFilter.append('*');

    // Use the ProxyModel to filter:
    // This code is #ifdefed as setNameFilter behaves
    // slightly different than the QSortFilterProxyModel
    // as it will not remove directories. I will ask
    // our beloved usability experts for input
    // -- z.
#if 0
    m_dirLister->setNameFilter(adjustedFilter);
    m_dirLister->emitChanges();
#else
    m_proxyModel->setFilterRegExp( nameFilter );
#endif
}

void DolphinView::createView()
{
    // delete current view
    QAbstractItemView* view = itemView();
    if (view != 0) {
        m_topLayout->remove(view);
        view->close();
        view->deleteLater();
        m_iconsView = 0;
        m_detailsView = 0;
    }

    assert(m_iconsView == 0);
    assert(m_detailsView == 0);

    // ... and recreate it representing the current mode
    switch (m_mode) {
        case IconsView:
            m_iconsView = new DolphinIconsView(this);
            m_iconsView->setViewMode(QListView::IconMode);
            m_iconsView->setSpacing(32);
            view = m_iconsView;
            // TODO: read out view settings
            break;

        case DetailsView:
            m_detailsView = new DolphinDetailsView(this);
            view = m_detailsView;
            // TODO: read out view settings
            break;
    }

    view->setModel(m_proxyModel);

    view->setSelectionMode(QAbstractItemView::ExtendedSelection);

    KFileItemDelegate* delegate = new KFileItemDelegate(this);
    delegate->setAdditionalInformation(KFileItemDelegate::FriendlyMimeType);
    view->setItemDelegate(delegate);

    new KMimeTypeResolver(view, m_dirModel);

    connect(view, SIGNAL(clicked(const QModelIndex&)),
            this, SLOT(triggerItem(const QModelIndex&)));
    connect(view->selectionModel(), SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)),
            this, SLOT(emitSelectionChangedSignal()));

    m_topLayout->insertWidget(1, view);
}

int DolphinView::columnIndex(Sorting sorting) const
{
    int index = 0;
    switch (sorting) {
        case SortByName: index = KDirModel::Name; break;
        case SortBySize: index = KDirModel::Size; break;
        case SortByDate: index = KDirModel::ModifiedTime; break;
        default: assert(false);
    }
    return index;
}

void DolphinView::selectAll(QItemSelectionModel::SelectionFlags flags)
{
    QItemSelectionModel* selectionModel = itemView()->selectionModel();
    const QAbstractItemModel* itemModel = selectionModel->model();

    const QModelIndex topLeft = itemModel->index(0, 0);
    const QModelIndex bottomRight = itemModel->index(itemModel->rowCount() - 1,
                                                     itemModel->columnCount() - 1);

    QItemSelection selection(topLeft, bottomRight);
    selectionModel->select(selection, flags);
}

QAbstractItemView* DolphinView::itemView() const
{
    assert((m_iconsView == 0) || (m_detailsView == 0));
    if (m_detailsView != 0) {
        return m_detailsView;
    }
    return m_iconsView;
}

#include "dolphinview.moc"