+++ /dev/null
-/***************************************************************************
- * Copyright (C) 2008 by Peter Penz <peter.penz@gmx.at> *
- * *
- * 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 "kfilepreviewgenerator.h"
-
-#include <kabstractviewadapter_p.h>
-#include <kfileitem.h>
-#include <kiconeffect.h>
-#include <kio/previewjob.h>
-#include <kdirlister.h>
-#include <kdirmodel.h>
-#include <kmimetyperesolver.h>
-#include <konqmimedata.h>
-
-#include <QApplication>
-#include <QAbstractItemView>
-#include <QAbstractProxyModel>
-#include <QClipboard>
-#include <QColor>
-#include <QList>
-#include <QListView>
-#include <QPainter>
-#include <QPixmap>
-#include <QScrollBar>
-#include <QIcon>
-
-#ifdef Q_WS_X11
-# include <QX11Info>
-# include <X11/Xlib.h>
-# include <X11/extensions/Xrender.h>
-#endif
-
-/**
- * Implementation of the view adapter for the default case when
- * an instance of QAbstractItemView is used as view.
- */
-class DefaultViewAdapter : public KAbstractViewAdapter
-{
-public:
- DefaultViewAdapter(QAbstractItemView* view, QObject* parent);
- virtual QObject* createMimeTypeResolver(KDirModel* model) const;
- virtual QSize iconSize() const;
- virtual QPalette palette() const;
- virtual QRect visibleArea() const;
- virtual QRect visualRect(const QModelIndex& index) const;
- virtual void connect(Signal signal, QObject* receiver, const char* slot);
-
-private:
- QAbstractItemView* m_view;
-};
-
-DefaultViewAdapter::DefaultViewAdapter(QAbstractItemView* view, QObject* parent) :
- KAbstractViewAdapter(parent),
- m_view(view)
-{
-}
-
-QObject* DefaultViewAdapter::createMimeTypeResolver(KDirModel* model) const
-{
- return new KMimeTypeResolver(m_view, model);
-}
-
-QSize DefaultViewAdapter::iconSize() const
-{
- return m_view->iconSize();
-}
-
-QPalette DefaultViewAdapter::palette() const
-{
- return m_view->palette();
-}
-
-QRect DefaultViewAdapter::visibleArea() const
-{
- return m_view->viewport()->rect();
-}
-
-QRect DefaultViewAdapter::visualRect(const QModelIndex& index) const
-{
- return m_view->visualRect(index);
-}
-
-void DefaultViewAdapter::connect(Signal signal, QObject* receiver, const char* slot)
-{
- if (signal == ScrollBarValueChanged) {
- QObject::connect(m_view->horizontalScrollBar(), SIGNAL(valueChanged(int)), receiver, slot);
- QObject::connect(m_view->verticalScrollBar(), SIGNAL(valueChanged(int)), receiver, slot);
- }
-}
-
-/**
- * If the passed item view is an instance of QListView, expensive
- * layout operations are blocked in the constructor and are unblocked
- * again in the destructor.
- *
- * This helper class is a workaround for the following huge performance
- * problem when having directories with several 1000 items:
- * - each change of an icon emits a dataChanged() signal from the model
- * - QListView iterates through all items on each dataChanged() signal
- * and invokes QItemDelegate::sizeHint()
- * - the sizeHint() implementation of KFileItemDelegate is quite complex,
- * invoking it 1000 times for each icon change might block the UI
- *
- * QListView does not invoke QItemDelegate::sizeHint() when the
- * uniformItemSize property has been set to true, so this property is
- * set before exchanging a block of icons. It is important to reset
- * it again before the event loop is entered, otherwise QListView
- * would not get the correct size hints after dispatching the layoutChanged()
- * signal.
- */
-class LayoutBlocker {
-public:
- LayoutBlocker(QAbstractItemView* view) :
- m_uniformSizes(false),
- m_view(qobject_cast<QListView*>(view))
- {
- if (m_view != 0) {
- m_uniformSizes = m_view->uniformItemSizes();
- m_view->setUniformItemSizes(true);
- }
- }
-
- ~LayoutBlocker()
- {
- if (m_view != 0) {
- m_view->setUniformItemSizes(m_uniformSizes);
- }
- }
-
-private:
- bool m_uniformSizes;
- QListView* m_view;
-};
-
-class KFilePreviewGenerator::Private
-{
-public:
- Private(KFilePreviewGenerator* parent,
- KAbstractViewAdapter* viewAdapter,
- QAbstractProxyModel* model);
- ~Private();
-
- /**
- * Generates previews for the items \a items asynchronously.
- */
- void generatePreviews(const KFileItemList& items);
-
- /**
- * Adds the preview \a pixmap for the item \a item to the preview
- * queue and starts a timer which will dispatch the preview queue
- * later.
- */
- void addToPreviewQueue(const KFileItem& item, const QPixmap& pixmap);
-
- /**
- * Is invoked when the preview job has been finished and
- * removes the job from the m_previewJobs list.
- */
- void slotPreviewJobFinished(KJob* job);
-
- /** Synchronizes the item icon with the clipboard of cut items. */
- void updateCutItems();
-
- /**
- * Dispatches the preview queue block by block within
- * time slices.
- */
- void dispatchPreviewQueue();
-
- /**
- * Pauses all preview jobs and invokes KFilePreviewGenerator::resumePreviews()
- * after a short delay. Is invoked as soon as the user has moved
- * a scrollbar.
- */
- void pausePreviews();
-
- /**
- * Resumes the previews that have been paused after moving the
- * scrollbar. The previews for the current visible area are
- * generated first.
- */
- void resumePreviews();
-
- /**
- * Returns true, if the item \a item has been cut into
- * the clipboard.
- */
- bool isCutItem(const KFileItem& item) const;
-
- /** Applies an item effect to all cut items. */
- void applyCutItemEffect();
-
- /**
- * Applies a frame around the icon. False is returned if
- * no frame has been added because the icon is too small.
- */
- bool applyImageFrame(QPixmap& icon);
-
- /**
- * Resizes the icon to \a maxSize if the icon size does not
- * fit into the maximum size. The aspect ratio of the icon
- * is kept.
- */
- void limitToSize(QPixmap& icon, const QSize& maxSize);
-
- /**
- * Starts a new preview job for the items \a to m_previewJobs
- * and triggers the preview timer.
- */
- void startPreviewJob(const KFileItemList& items);
-
- /** Kills all ongoing preview jobs. */
- void killPreviewJobs();
-
- /**
- * Orders the items \a items in a way that the visible items
- * are moved to the front of the list. When passing this
- * list to a preview job, the visible items will get generated
- * first.
- */
- void orderItems(KFileItemList& items);
-
- /** Remembers the pixmap for an item specified by an URL. */
- struct ItemInfo
- {
- KUrl url;
- QPixmap pixmap;
- };
-
- bool m_previewShown;
-
- /**
- * True, if m_pendingItems and m_dispatchedItems should be
- * cleared when the preview jobs have been finished.
- */
- bool m_clearItemQueues;
-
- /**
- * True if a selection has been done which should cut items.
- */
- bool m_hasCutSelection;
-
- int m_pendingVisiblePreviews;
-
- KAbstractViewAdapter* m_viewAdapter;
- QAbstractItemView* m_itemView;
- QTimer* m_previewTimer;
- QTimer* m_scrollAreaTimer;
- QList<KJob*> m_previewJobs;
- KDirModel* m_dirModel;
- QAbstractProxyModel* m_proxyModel;
-
- QObject* m_mimeTypeResolver;
-
- QList<ItemInfo> m_cutItemsCache;
- QList<ItemInfo> m_previews;
-
- /**
- * Contains all items where a preview must be generated, but
- * where the preview job has not dispatched the items yet.
- */
- KFileItemList m_pendingItems;
-
- /**
- * Contains all items, where a preview has already been
- * generated by the preview jobs.
- */
- KFileItemList m_dispatchedItems;
-
-private:
- KFilePreviewGenerator* const q;
-
-};
-
-KFilePreviewGenerator::Private::Private(KFilePreviewGenerator* parent,
- KAbstractViewAdapter* viewAdapter,
- QAbstractProxyModel* model) :
- m_previewShown(true),
- m_clearItemQueues(true),
- m_hasCutSelection(false),
- m_pendingVisiblePreviews(0),
- m_viewAdapter(viewAdapter),
- m_itemView(0),
- m_previewTimer(0),
- m_scrollAreaTimer(0),
- m_previewJobs(),
- m_dirModel(0),
- m_proxyModel(model),
- m_mimeTypeResolver(0),
- m_cutItemsCache(),
- m_previews(),
- m_pendingItems(),
- m_dispatchedItems(),
- q(parent)
-{
- if (!m_viewAdapter->iconSize().isValid()) {
- m_previewShown = false;
- }
-
- m_dirModel = static_cast<KDirModel*>(m_proxyModel->sourceModel());
- connect(m_dirModel->dirLister(), SIGNAL(newItems(const KFileItemList&)),
- q, SLOT(generatePreviews(const KFileItemList&)));
-
- QClipboard* clipboard = QApplication::clipboard();
- connect(clipboard, SIGNAL(dataChanged()),
- q, SLOT(updateCutItems()));
-
- m_previewTimer = new QTimer(q);
- m_previewTimer->setSingleShot(true);
- connect(m_previewTimer, SIGNAL(timeout()), q, SLOT(dispatchPreviewQueue()));
-
- // Whenever the scrollbar values have been changed, the pending previews should
- // be reordered in a way that the previews for the visible items are generated
- // first. The reordering is done with a small delay, so that during moving the
- // scrollbars the CPU load is kept low.
- m_scrollAreaTimer = new QTimer(q);
- m_scrollAreaTimer->setSingleShot(true);
- m_scrollAreaTimer->setInterval(200);
- connect(m_scrollAreaTimer, SIGNAL(timeout()),
- q, SLOT(resumePreviews()));
- m_viewAdapter->connect(KAbstractViewAdapter::ScrollBarValueChanged,
- q, SLOT(pausePreviews()));
-}
-
-KFilePreviewGenerator::Private::~Private()
-{
- killPreviewJobs();
- m_pendingItems.clear();
- m_dispatchedItems.clear();
- if (m_mimeTypeResolver != 0) {
- m_mimeTypeResolver->deleteLater();
- m_mimeTypeResolver = 0;
- }
-}
-
-void KFilePreviewGenerator::Private::generatePreviews(const KFileItemList& items)
-{
- applyCutItemEffect();
-
- if (!m_previewShown) {
- return;
- }
-
- KFileItemList orderedItems = items;
- orderItems(orderedItems);
-
- foreach (const KFileItem& item, orderedItems) {
- m_pendingItems.append(item);
- }
-
- startPreviewJob(orderedItems);
-}
-
-void KFilePreviewGenerator::Private::addToPreviewQueue(const KFileItem& item, const QPixmap& pixmap)
-{
- if (!m_previewShown) {
- // the preview has been canceled in the meantime
- return;
- }
- const KUrl url = item.url();
-
- // check whether the item is part of the directory lister (it is possible
- // that a preview from an old directory lister is received)
- KDirLister* dirLister = m_dirModel->dirLister();
- bool isOldPreview = true;
- const KUrl::List dirs = dirLister->directories();
- const QString itemDir = url.directory();
- foreach (const KUrl& url, dirs) {
- if (url.path() == itemDir) {
- isOldPreview = false;
- break;
- }
- }
- if (isOldPreview) {
- return;
- }
-
- QPixmap icon = pixmap;
-
- const QString mimeType = item.mimetype();
- const QString mimeTypeGroup = mimeType.left(mimeType.indexOf('/'));
- if ((mimeTypeGroup != "image") || !applyImageFrame(icon)) {
- limitToSize(icon, m_viewAdapter->iconSize());
- }
-
- if (m_hasCutSelection && isCutItem(item)) {
- // Remember the current icon in the cache for cut items before
- // the disabled effect is applied. This makes it possible restoring
- // the uncut version again when cutting other items.
- QList<ItemInfo>::iterator begin = m_cutItemsCache.begin();
- QList<ItemInfo>::iterator end = m_cutItemsCache.end();
- for (QList<ItemInfo>::iterator it = begin; it != end; ++it) {
- if ((*it).url == item.url()) {
- (*it).pixmap = icon;
- break;
- }
- }
-
- // apply the disabled effect to the icon for marking it as "cut item"
- // and apply the icon to the item
- KIconEffect iconEffect;
- icon = iconEffect.apply(icon, KIconLoader::Desktop, KIconLoader::DisabledState);
- }
-
- // remember the preview and URL, so that it can be applied to the model
- // in KFilePreviewGenerator::dispatchPreviewQueue()
- ItemInfo preview;
- preview.url = url;
- preview.pixmap = icon;
- m_previews.append(preview);
-
- m_dispatchedItems.append(item);
-}
-
-void KFilePreviewGenerator::Private::slotPreviewJobFinished(KJob* job)
-{
- const int index = m_previewJobs.indexOf(job);
- m_previewJobs.removeAt(index);
-
- if ((m_previewJobs.count() == 0) && m_clearItemQueues) {
- m_pendingItems.clear();
- m_dispatchedItems.clear();
- m_pendingVisiblePreviews = 0;
- QMetaObject::invokeMethod(q, "dispatchPreviewQueue", Qt::QueuedConnection);
- }
-}
-
-void KFilePreviewGenerator::Private::updateCutItems()
-{
- // restore the icons of all previously selected items to the
- // original state...
- foreach (const ItemInfo& cutItem, m_cutItemsCache) {
- const QModelIndex index = m_dirModel->indexForUrl(cutItem.url);
- if (index.isValid()) {
- m_dirModel->setData(index, QIcon(cutItem.pixmap), Qt::DecorationRole);
- }
- }
- m_cutItemsCache.clear();
-
- // ... and apply an item effect to all currently cut items
- applyCutItemEffect();
-}
-
-void KFilePreviewGenerator::Private::dispatchPreviewQueue()
-{
- const int previewsCount = m_previews.count();
- if (previewsCount > 0) {
- // Applying the previews to the model must be done step by step
- // in larger blocks: Applying a preview immediately when getting the signal
- // 'gotPreview()' from the PreviewJob is too expensive, as a relayout
- // of the view would be triggered for each single preview.
- LayoutBlocker blocker(m_itemView);
- for (int i = 0; i < previewsCount; ++i) {
- const ItemInfo& preview = m_previews.first();
-
- const QModelIndex idx = m_dirModel->indexForUrl(preview.url);
- if (idx.isValid() && (idx.column() == 0)) {
- m_dirModel->setData(idx, QIcon(preview.pixmap), Qt::DecorationRole);
- }
-
- m_previews.pop_front();
- if (m_pendingVisiblePreviews > 0) {
- --m_pendingVisiblePreviews;
- }
- }
- }
-
- if (m_pendingVisiblePreviews > 0) {
- // As long as there are pending previews for visible items, poll
- // the preview queue each 200 ms. If there are no pending previews,
- // the queue is dispatched in slotPreviewJobFinished().
- m_previewTimer->start(200);
- }
-}
-
-void KFilePreviewGenerator::Private::pausePreviews()
-{
- foreach (KJob* job, m_previewJobs) {
- Q_ASSERT(job != 0);
- job->suspend();
- }
- m_scrollAreaTimer->start();
-}
-
-void KFilePreviewGenerator::Private::resumePreviews()
-{
- // Before creating new preview jobs the m_pendingItems queue must be
- // cleaned up by removing the already dispatched items. Implementation
- // note: The order of the m_dispatchedItems queue and the m_pendingItems
- // queue is usually equal. So even when having a lot of elements the
- // nested loop is no performance bottle neck, as the inner loop is only
- // entered once in most cases.
- foreach (const KFileItem& item, m_dispatchedItems) {
- KFileItemList::iterator begin = m_pendingItems.begin();
- KFileItemList::iterator end = m_pendingItems.end();
- for (KFileItemList::iterator it = begin; it != end; ++it) {
- if ((*it).url() == item.url()) {
- m_pendingItems.erase(it);
- break;
- }
- }
- }
- m_dispatchedItems.clear();
-
- m_pendingVisiblePreviews = 0;
- dispatchPreviewQueue();
-
- KFileItemList orderedItems = m_pendingItems;
- orderItems(orderedItems);
-
- // Kill all suspended preview jobs. Usually when a preview job
- // has been finished, slotPreviewJobFinished() clears all item queues.
- // This is not wanted in this case, as a new job is created afterwards
- // for m_pendingItems.
- m_clearItemQueues = false;
- killPreviewJobs();
- m_clearItemQueues = true;
-
- startPreviewJob(orderedItems);
-}
-
-bool KFilePreviewGenerator::Private::isCutItem(const KFileItem& item) const
-{
- const QMimeData* mimeData = QApplication::clipboard()->mimeData();
- const KUrl::List cutUrls = KUrl::List::fromMimeData(mimeData);
-
- const KUrl itemUrl = item.url();
- foreach (const KUrl& url, cutUrls) {
- if (url == itemUrl) {
- return true;
- }
- }
-
- return false;
-}
-
-void KFilePreviewGenerator::Private::applyCutItemEffect()
-{
- const QMimeData* mimeData = QApplication::clipboard()->mimeData();
- m_hasCutSelection = KonqMimeData::decodeIsCutSelection(mimeData);
- if (!m_hasCutSelection) {
- return;
- }
-
- KFileItemList items;
- KDirLister* dirLister = m_dirModel->dirLister();
- const KUrl::List dirs = dirLister->directories();
- foreach (const KUrl& url, dirs) {
- items << dirLister->itemsForDir(url);
- }
-
- foreach (const KFileItem& item, items) {
- if (isCutItem(item)) {
- const QModelIndex index = m_dirModel->indexForItem(item);
- const QVariant value = m_dirModel->data(index, Qt::DecorationRole);
- if (value.type() == QVariant::Icon) {
- const QIcon icon(qvariant_cast<QIcon>(value));
- const QSize actualSize = icon.actualSize(m_viewAdapter->iconSize());
- QPixmap pixmap = icon.pixmap(actualSize);
-
- // remember current pixmap for the item to be able
- // to restore it when other items get cut
- ItemInfo cutItem;
- cutItem.url = item.url();
- cutItem.pixmap = pixmap;
- m_cutItemsCache.append(cutItem);
-
- // apply icon effect to the cut item
- KIconEffect iconEffect;
- pixmap = iconEffect.apply(pixmap, KIconLoader::Desktop, KIconLoader::DisabledState);
- m_dirModel->setData(index, QIcon(pixmap), Qt::DecorationRole);
- }
- }
- }
-}
-
-bool KFilePreviewGenerator::Private::applyImageFrame(QPixmap& icon)
-{
- const QSize maxSize = m_viewAdapter->iconSize();
- const bool applyFrame = (maxSize.width() > KIconLoader::SizeSmallMedium) &&
- (maxSize.height() > KIconLoader::SizeSmallMedium) &&
- ((icon.width() > KIconLoader::SizeLarge) ||
- (icon.height() > KIconLoader::SizeLarge));
- if (!applyFrame) {
- // the maximum size or the image itself is too small for a frame
- return false;
- }
-
- const int frame = 4;
- const int doubleFrame = frame * 2;
-
- // resize the icon to the maximum size minus the space required for the frame
- limitToSize(icon, QSize(maxSize.width() - doubleFrame, maxSize.height() - doubleFrame));
-
- QPainter painter;
- const QPalette palette = m_viewAdapter->palette();
- QPixmap framedIcon(icon.size().width() + doubleFrame, icon.size().height() + doubleFrame);
- framedIcon.fill(palette.color(QPalette::Normal, QPalette::Base));
- const int width = framedIcon.width() - 1;
- const int height = framedIcon.height() - 1;
-
- painter.begin(&framedIcon);
- painter.drawPixmap(frame, frame, icon);
-
- // add a border
- painter.setPen(palette.color(QPalette::Text));
- painter.drawRect(0, 0, width, height);
- painter.drawRect(1, 1, width - 2, height - 2);
-
- painter.setCompositionMode(QPainter::CompositionMode_Plus);
- QColor blendColor = palette.color(QPalette::Normal, QPalette::Base);
-
- blendColor.setAlpha(255 - 32);
- painter.setPen(blendColor);
- painter.drawRect(0, 0, width, height);
-
- blendColor.setAlpha(255 - 64);
- painter.setPen(blendColor);
- painter.drawRect(1, 1, width - 2, height - 2);
- painter.end();
-
- icon = framedIcon;
-
- return true;
-}
-
-void KFilePreviewGenerator::Private::limitToSize(QPixmap& icon, const QSize& maxSize)
-{
- if ((icon.width() > maxSize.width()) || (icon.height() > maxSize.height())) {
-#ifdef Q_WS_X11
- // Assume that the texture size limit is 2048x2048
- if ((icon.width() <= 2048) && (icon.height() <= 2048)) {
- QSize size = icon.size();
- size.scale(maxSize, Qt::KeepAspectRatio);
-
- const qreal factor = size.width() / qreal(icon.width());
-
- XTransform xform = {{
- { XDoubleToFixed(1 / factor), 0, 0 },
- { 0, XDoubleToFixed(1 / factor), 0 },
- { 0, 0, XDoubleToFixed(1) }
- }};
-
- QPixmap pixmap(size);
- pixmap.fill(Qt::transparent);
-
- Display *dpy = QX11Info::display();
- XRenderSetPictureFilter(dpy, icon.x11PictureHandle(), FilterBilinear, 0, 0);
- XRenderSetPictureTransform(dpy, icon.x11PictureHandle(), &xform);
- XRenderComposite(dpy, PictOpOver, icon.x11PictureHandle(), None, pixmap.x11PictureHandle(),
- 0, 0, 0, 0, 0, 0, pixmap.width(), pixmap.height());
- icon = pixmap;
- } else {
- icon = icon.scaled(maxSize, Qt::KeepAspectRatio, Qt::FastTransformation);
- }
-#else
- icon = icon.scaled(maxSize, Qt::KeepAspectRatio, Qt::FastTransformation);
-#endif
- }
-}
-
-void KFilePreviewGenerator::Private::startPreviewJob(const KFileItemList& items)
-{
- if (items.count() == 0) {
- return;
- }
-
- const QMimeData* mimeData = QApplication::clipboard()->mimeData();
- m_hasCutSelection = KonqMimeData::decodeIsCutSelection(mimeData);
-
- const QSize size = m_viewAdapter->iconSize();
-
- // PreviewJob internally caches items always with the size of
- // 128 x 128 pixels or 256 x 256 pixels. A downscaling is done
- // by PreviewJob if a smaller size is requested. As the KFilePreviewGenerator must
- // do a downscaling anyhow because of the frame, only the provided
- // cache sizes are requested.
- const int cacheSize = (size.width() > 128) || (size.height() > 128) ? 256 : 128;
- KIO::PreviewJob* job = KIO::filePreview(items, cacheSize, cacheSize);
- connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
- q, SLOT(addToPreviewQueue(const KFileItem&, const QPixmap&)));
- connect(job, SIGNAL(finished(KJob*)),
- q, SLOT(slotPreviewJobFinished(KJob*)));
-
- m_previewJobs.append(job);
- m_previewTimer->start(200);
-}
-
-void KFilePreviewGenerator::Private::killPreviewJobs()
-{
- foreach (KJob* job, m_previewJobs) {
- Q_ASSERT(job != 0);
- job->kill();
- }
- m_previewJobs.clear();
-}
-
-void KFilePreviewGenerator::Private::orderItems(KFileItemList& items)
-{
- // Order the items in a way that the preview for the visible items
- // is generated first, as this improves the feeled performance a lot.
- //
- // Implementation note: 2 different algorithms are used for the sorting.
- // Algorithm 1 is faster when having a lot of items in comparison
- // to the number of rows in the model. Algorithm 2 is faster
- // when having quite less items in comparison to the number of rows in
- // the model. Choosing the right algorithm is important when having directories
- // with several hundreds or thousands of items.
-
- const int itemCount = items.count();
- const int rowCount = m_proxyModel->rowCount();
- const QRect visibleArea = m_viewAdapter->visibleArea();
-
- int insertPos = 0;
- if (itemCount * 10 > rowCount) {
- // Algorithm 1: The number of items is > 10 % of the row count. Parse all rows
- // and check whether the received row is part of the item list.
- for (int row = 0; row < rowCount; ++row) {
- const QModelIndex proxyIndex = m_proxyModel->index(row, 0);
- const QRect itemRect = m_viewAdapter->visualRect(proxyIndex);
- const QModelIndex dirIndex = m_proxyModel->mapToSource(proxyIndex);
-
- KFileItem item = m_dirModel->itemForIndex(dirIndex); // O(1)
- const KUrl url = item.url();
-
- // check whether the item is part of the item list 'items'
- int index = -1;
- for (int i = 0; i < itemCount; ++i) {
- if (items.at(i).url() == url) {
- index = i;
- break;
- }
- }
-
- if ((index > 0) && itemRect.intersects(visibleArea)) {
- // The current item is (at least partly) visible. Move it
- // to the front of the list, so that the preview is
- // generated earlier.
- items.removeAt(index);
- items.insert(insertPos, item);
- ++insertPos;
- ++m_pendingVisiblePreviews;
- }
- }
- } else {
- // Algorithm 2: The number of items is <= 10 % of the row count. In this case iterate
- // all items and receive the corresponding row from the item.
- for (int i = 0; i < itemCount; ++i) {
- const QModelIndex dirIndex = m_dirModel->indexForItem(items.at(i)); // O(n) (n = number of rows)
- const QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
- const QRect itemRect = m_viewAdapter->visualRect(proxyIndex);
-
- if (itemRect.intersects(visibleArea)) {
- // The current item is (at least partly) visible. Move it
- // to the front of the list, so that the preview is
- // generated earlier.
- items.insert(insertPos, items.at(i));
- items.removeAt(i + 1);
- ++insertPos;
- ++m_pendingVisiblePreviews;
- }
- }
- }
-}
-
-KFilePreviewGenerator::KFilePreviewGenerator(QAbstractItemView* parent, QAbstractProxyModel* model) :
- QObject(parent),
- d(new Private(this, new DefaultViewAdapter(parent, this), model))
-{
- d->m_itemView = parent;
-}
-
-KFilePreviewGenerator::KFilePreviewGenerator(KAbstractViewAdapter* parent, QAbstractProxyModel* model) :
- QObject(parent),
- d(new Private(this, parent, model))
-{
-}
-
-KFilePreviewGenerator::~KFilePreviewGenerator()
-{
- delete d;
-}
-
-void KFilePreviewGenerator::setPreviewShown(bool show)
-{
- if (show && !d->m_viewAdapter->iconSize().isValid()) {
- // the view must provide an icon size, otherwise the showing
- // off previews will get ignored
- return;
- }
-
- if (d->m_previewShown != show) {
- d->m_previewShown = show;
- d->m_cutItemsCache.clear();
- d->updateCutItems();
- if (show) {
- updatePreviews();
- }
- }
-
- if (show && (d->m_mimeTypeResolver != 0)) {
- // don't resolve the MIME types if the preview is turned on
- d->m_mimeTypeResolver->deleteLater();
- d->m_mimeTypeResolver = 0;
- } else if (!show && (d->m_mimeTypeResolver == 0)) {
- // the preview is turned off: resolve the MIME-types so that
- // the icons gets updated
- d->m_mimeTypeResolver = d->m_viewAdapter->createMimeTypeResolver(d->m_dirModel);
- }
-}
-
-bool KFilePreviewGenerator::isPreviewShown() const
-{
- return d->m_previewShown;
-}
-
-void KFilePreviewGenerator::updatePreviews()
-{
- if (!d->m_previewShown) {
- return;
- }
-
- d->killPreviewJobs();
- d->m_cutItemsCache.clear();
- d->m_pendingItems.clear();
- d->m_dispatchedItems.clear();
-
- KFileItemList itemList;
- const int rowCount = d->m_dirModel->rowCount();
- for (int row = 0; row < rowCount; ++row) {
- const QModelIndex index = d->m_dirModel->index(row, 0);
- KFileItem item = d->m_dirModel->itemForIndex(index);
- itemList.append(item);
- }
-
- d->generatePreviews(itemList);
- d->updateCutItems();
-}
-
-void KFilePreviewGenerator::cancelPreviews()
-{
- d->killPreviewJobs();
- d->m_cutItemsCache.clear();
- d->m_pendingItems.clear();
- d->m_dispatchedItems.clear();
-}
-
-#include "kfilepreviewgenerator.moc"
projects / dolphin.git / commitdiff