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Diffstat (limited to 'src/iconmanager.cpp')
| -rw-r--r-- | src/iconmanager.cpp | 596 |
1 files changed, 0 insertions, 596 deletions
diff --git a/src/iconmanager.cpp b/src/iconmanager.cpp deleted file mode 100644 index ab854d738..000000000 --- a/src/iconmanager.cpp +++ /dev/null @@ -1,596 +0,0 @@ -/*************************************************************************** - * Copyright (C) 2008 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 "iconmanager.h" - -#include <kiconeffect.h> -#include <kio/previewjob.h> -#include <kdirlister.h> -#include <kdirmodel.h> -#include <kdirsortfilterproxymodel.h> -#include <kmimetyperesolver.h> -#include <konqmimedata.h> - -#include <QApplication> -#include <QAbstractItemView> -#include <QClipboard> -#include <QColor> -#include <QListView> -#include <QPainter> -#include <QScrollBar> -#include <QIcon> - -/** - * 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; -}; - -IconManager::IconManager(QAbstractItemView* parent, KDirSortFilterProxyModel* model) : - QObject(parent), - m_showPreview(false), - m_clearItemQueues(true), - m_hasCutSelection(false), - m_pendingVisiblePreviews(0), - m_view(parent), - 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_ASSERT(m_view->iconSize().isValid()); // each view must provide its current icon size - - m_dirModel = static_cast<KDirModel*>(m_proxyModel->sourceModel()); - connect(m_dirModel->dirLister(), SIGNAL(newItems(const KFileItemList&)), - this, SLOT(generatePreviews(const KFileItemList&))); - - QClipboard* clipboard = QApplication::clipboard(); - connect(clipboard, SIGNAL(dataChanged()), - this, SLOT(updateCutItems())); - - m_previewTimer = new QTimer(this); - m_previewTimer->setSingleShot(true); - connect(m_previewTimer, SIGNAL(timeout()), this, 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(this); - m_scrollAreaTimer->setSingleShot(true); - m_scrollAreaTimer->setInterval(200); - connect(m_scrollAreaTimer, SIGNAL(timeout()), - this, SLOT(resumePreviews())); - connect(m_view->horizontalScrollBar(), SIGNAL(valueChanged(int)), - this, SLOT(pausePreviews())); - connect(m_view->verticalScrollBar(), SIGNAL(valueChanged(int)), - this, SLOT(pausePreviews())); -} - -IconManager::~IconManager() -{ - killPreviewJobs(); - m_pendingItems.clear(); - m_dispatchedItems.clear(); - if (m_mimeTypeResolver != 0) { - m_mimeTypeResolver->deleteLater(); - m_mimeTypeResolver = 0; - } -} - -void IconManager::setShowPreview(bool show) -{ - if (m_showPreview != show) { - m_showPreview = show; - m_cutItemsCache.clear(); - updateCutItems(); - if (show) { - updatePreviews(); - } - } - - if (show && (m_mimeTypeResolver != 0)) { - // don't resolve the MIME types if the preview is turned on - m_mimeTypeResolver->deleteLater(); - m_mimeTypeResolver = 0; - } else if (!show && (m_mimeTypeResolver == 0)) { - // the preview is turned off: resolve the MIME-types so that - // the icons gets updated - m_mimeTypeResolver = new KMimeTypeResolver(m_view, m_dirModel); - } -} - -void IconManager::updatePreviews() -{ - if (!m_showPreview) { - return; - } - - killPreviewJobs(); - m_cutItemsCache.clear(); - m_pendingItems.clear(); - m_dispatchedItems.clear(); - - KFileItemList itemList; - const int rowCount = m_dirModel->rowCount(); - for (int row = 0; row < rowCount; ++row) { - const QModelIndex index = m_dirModel->index(row, 0); - KFileItem item = m_dirModel->itemForIndex(index); - itemList.append(item); - } - - generatePreviews(itemList); - updateCutItems(); -} - -void IconManager::cancelPreviews() -{ - killPreviewJobs(); - m_cutItemsCache.clear(); - m_pendingItems.clear(); - m_dispatchedItems.clear(); -} - -void IconManager::generatePreviews(const KFileItemList& items) -{ - applyCutItemEffect(); - - if (!m_showPreview) { - return; - } - - KFileItemList orderedItems = items; - orderItems(orderedItems); - - foreach (const KFileItem& item, orderedItems) { - m_pendingItems.append(item); - } - - startPreviewJob(orderedItems); -} - -void IconManager::addToPreviewQueue(const KFileItem& item, const QPixmap& pixmap) -{ - if (!m_showPreview) { - // 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_view->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 IconManager::dispatchPreviewQueue() - ItemInfo preview; - preview.url = url; - preview.pixmap = icon; - m_previews.append(preview); - - m_dispatchedItems.append(item); -} - -void IconManager::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(this, "dispatchPreviewQueue", Qt::QueuedConnection); - } -} - -void IconManager::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 IconManager::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_view); - 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 IconManager::pausePreviews() -{ - foreach (KJob* job, m_previewJobs) { - Q_ASSERT(job != 0); - job->suspend(); - } - m_scrollAreaTimer->start(); -} - -void IconManager::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 IconManager::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 IconManager::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_view->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 IconManager::applyImageFrame(QPixmap& icon) -{ - const QSize maxSize = m_view->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_view->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 IconManager::limitToSize(QPixmap& icon, const QSize& maxSize) -{ - if ((icon.width() > maxSize.width()) || (icon.height() > maxSize.height())) { - icon = icon.scaled(maxSize, Qt::KeepAspectRatio, Qt::FastTransformation); - } -} - -void IconManager::startPreviewJob(const KFileItemList& items) -{ - if (items.count() == 0) { - return; - } - - const QMimeData* mimeData = QApplication::clipboard()->mimeData(); - m_hasCutSelection = KonqMimeData::decodeIsCutSelection(mimeData); - - const QSize size = m_view->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 IconManager 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&)), - this, SLOT(addToPreviewQueue(const KFileItem&, const QPixmap&))); - connect(job, SIGNAL(finished(KJob*)), - this, SLOT(slotPreviewJobFinished(KJob*))); - - m_previewJobs.append(job); - m_previewTimer->start(200); -} - -void IconManager::killPreviewJobs() -{ - foreach (KJob* job, m_previewJobs) { - Q_ASSERT(job != 0); - job->kill(); - } - m_previewJobs.clear(); -} - -void IconManager::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_view->viewport()->rect(); - - 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_view->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_view->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; - } - } - } -} - -#include "iconmanager.moc" |