#ifndef KFILEITEMMODELROLESUPDATER_H
#define KFILEITEMMODELROLESUPDATER_H
-#include <libdolphin_export.h>
+#include <config-nepomuk.h>
#include <KFileItem>
#include <kitemviews/kitemmodelbase.h>
+#include <libdolphin_export.h>
+
#include <QObject>
#include <QSet>
#include <QSize>
#include <QStringList>
+class KDirectoryContentsCounter;
class KFileItemModel;
class KJob;
class QPixmap;
class QTimer;
+#ifdef HAVE_NEPOMUK
+ namespace Nepomuk2
+ {
+ class ResourceWatcher;
+ class Resource;
+ namespace Types
+ {
+ class Property;
+ }
+ }
+#else
+ // Required for the slot applyChangedNepomukRoles() that
+ // cannot be ifdefined due to moc.
+ namespace Nepomuk2
+ {
+ class Resource;
+ namespace Types
+ {
+ class Property;
+ }
+ }
+#endif
+
/**
* @brief Resolves expensive roles asynchronously and applies them to the KFileItemModel.
*
* KFileItemModel only resolves roles that are inexpensive like e.g. the file name or
* the permissions. Creating previews or determining the MIME-type can be quite expensive
* and KFileItemModelRolesUpdater takes care to update such roles asynchronously.
+ *
+ * To prevent a huge CPU and I/O load, these roles are not updated for all
+ * items, but only for the visible items, some items around the visible area,
+ * and the items on the first and last pages of the view. This is a compromise
+ * that aims to minimize the risk that the user sees items with unknown icons
+ * in the view when scrolling or pressing Home or End.
+ *
+ * Determining the roles is done in several phases:
+ *
+ * 1. If the sort role is "slow", it is determined for all items. If this
+ * cannot be finished synchronously in 200 ms, the remaining items are
+ * handled asynchronously by \a resolveNextSortRole().
+ *
+ * 2. The function startUpdating(), which is called if either the sort role
+ * has been successfully determined for all items, or items are inserted
+ * in the view, or the visible items might have changed because items
+ * were removed or moved, tries to determine the icons for all visible
+ * items synchronously for 200 ms. Then:
+ *
+ * (a) If previews are disabled, icons and all other roles are determined
+ * asynchronously for the interesting items. This is done by the
+ * function \a resolveNextPendingRoles().
+ *
+ * (b) If previews are enabled, a \a KIO::PreviewJob is started that loads
+ * the previews for the interesting items. At the same time, the icons
+ * for these items are determined asynchronously as fast as possible
+ * by \a resolveNextPendingRoles(). This minimizes the risk that the
+ * user sees "unknown" icons when scrolling before the previews have
+ * arrived.
+ *
+ * 3. Finally, the entire process is repeated for any items that might have
+ * changed in the mean time.
*/
class LIBDOLPHINPRIVATE_EXPORT KFileItemModelRolesUpdater : public QObject
{
*/
void setVisibleIndexRange(int index, int count);
+ void setMaximumVisibleItems(int count);
+
/**
* If \a show is set to true, the "iconPixmap" role will be filled with a preview
* of the file. If \a show is false the MIME type icon will be used for the "iconPixmap"
* role.
*/
- void setPreviewShown(bool show);
- bool isPreviewShown() const;
+ void setPreviewsShown(bool show);
+ bool previewsShown() const;
+
+ /**
+ * If enabled a small preview gets upscaled to the icon size in case where
+ * the icon size is larger than the preview. Per default enlarging is
+ * enabled.
+ */
+ void setEnlargeSmallPreviews(bool enlarge);
+ bool enlargeSmallPreviews() const;
/**
* If \a paused is set to true the asynchronous resolving of roles will be paused.
private slots:
void slotItemsInserted(const KItemRangeList& itemRanges);
void slotItemsRemoved(const KItemRangeList& itemRanges);
+ void slotItemsMoved(const KItemRange& itemRange, QList<int> movedToIndexes);
void slotItemsChanged(const KItemRangeList& itemRanges,
const QSet<QByteArray>& roles);
+ void slotSortRoleChanged(const QByteArray& current,
+ const QByteArray& previous);
/**
* Is invoked after a preview has been received successfully.
void slotPreviewFailed(const KFileItem& item);
/**
- * Is invoked when the preview job has been finished and
- * removes the job from the m_previewJobs list.
+ * Is invoked when the preview job has been finished. Starts a new preview
+ * job if there are any interesting items without previews left, or updates
+ * the changed items otherwise. *
* @see startPreviewJob()
*/
- void slotPreviewJobFinished(KJob* job);
+ void slotPreviewJobFinished();
- void resolvePendingRoles();
+ /**
+ * Resolves the sort role of the next item in m_pendingSortRole, applies it
+ * to the model, and invokes itself if there are any pending items left. If
+ * that is not the case, \a startUpdating() is called.
+ */
+ void resolveNextSortRole();
+
+ /**
+ * Resolves the icon name and (if previews are disabled) all other roles
+ * for the next interesting item. If there are no pending items left, any
+ * changed items are updated.
+ */
void resolveNextPendingRoles();
+ /**
+ * Resolves items that have not been resolved yet after the change has been
+ * notified by slotItemsChanged(). Is invoked if the m_changedItemsTimer
+ * expires.
+ */
+ void resolveRecentlyChangedItems();
+
+ void applyChangedNepomukRoles(const Nepomuk2::Resource& resource, const Nepomuk2::Types::Property& property);
+
+ void slotDirectoryContentsCountReceived(const QString& path, int count);
+
private:
/**
- * Updates the roles for the given item ranges. The roles for the currently
- * visible items will get updated first.
+ * Starts the updating of all roles. The visible items are handled first.
*/
- void startUpdating(const KItemRangeList& itemRanges);
+ void startUpdating();
/**
- * Creates previews for the items starting from the first item of the
- * given list.
+ * Loads the icons for the visible items. After 200 ms, the function
+ * stops determining mime types and only loads preliminary icons.
+ * This is a compromise that prevents that
+ * (a) the GUI is blocked for more than 200 ms, and
+ * (b) "unknown" icons could be shown in the view.
+ */
+ void updateVisibleIcons();
+
+ /**
+ * Creates previews for the items starting from the first item in
+ * m_pendingPreviewItems.
* @see slotGotPreview()
* @see slotPreviewFailed()
* @see slotPreviewJobFinished()
*/
- void startPreviewJob(const KFileItemList& items);
+ void startPreviewJob();
- bool hasPendingRoles() const;
- void resetPendingRoles();
- void triggerPendingRolesResolving(int count);
- void sortAndResolveAllRoles();
- void sortAndResolvePendingRoles();
+ /**
+ * Ensures that icons, previews, and other roles are determined for any
+ * items that have been changed.
+ */
+ void updateChangedItems();
+
+ /**
+ * Resolves the sort role of the item and applies it to the model.
+ */
+ void applySortRole(int index);
+
+ void applySortProgressToModel();
enum ResolveHint {
ResolveFast,
ResolveAll
};
- bool applyResolvedRoles(const KFileItem& item, ResolveHint hint);
- QHash<QByteArray, QVariant> rolesData(const KFileItem& item) const;
+ bool applyResolvedRoles(int index, ResolveHint hint);
+ QHash<QByteArray, QVariant> rolesData(const KFileItem& item);
+
+ /**
+ * @return The number of items of the path \a path.
+ */
+ int subItemsCount(const QString& path) const;
+
+ /**
+ * Must be invoked if a property has been changed that affects
+ * the look of the preview. Takes care to update all previews.
+ */
+ void updateAllPreviews();
- KFileItemList sortedItems(const QSet<KFileItem>& items) const;
+ void killPreviewJob();
- static int subDirectoriesCount(const QString& path);
+ QList<int> indexesToResolve() const;
private:
- // Property for setPaused()/isPaused().
- bool m_paused;
+ enum State {
+ Idle,
+ Paused,
+ ResolvingSortRole,
+ ResolvingAllRoles,
+ PreviewJobRunning
+ };
+
+ State m_state;
// Property changes during pausing must be remembered to be able
// to react when unpausing again:
bool m_iconSizeChangedDuringPausing;
bool m_rolesChangedDuringPausing;
- // Property for setPreviewShown()/previewShown().
+ // Property for setPreviewsShown()/previewsShown().
bool m_previewShown;
+ // Property for setEnlargeSmallPreviews()/enlargeSmallPreviews()
+ bool m_enlargeSmallPreviews;
+
// True if the role "iconPixmap" should be cleared when resolving the next
// role with resolveRole(). Is necessary if the preview gets disabled
// during the roles-updater has been paused by setPaused().
bool m_clearPreviews;
+ // Remembers which items have been handled already, to prevent that
+ // previews and other expensive roles are determined again.
+ QSet<KFileItem> m_finishedItems;
+
KFileItemModel* m_model;
QSize m_iconSize;
int m_firstVisibleIndex;
int m_lastVisibleIndex;
+ int m_maximumVisibleItems;
QSet<QByteArray> m_roles;
+ QSet<QByteArray> m_resolvableRoles;
QStringList m_enabledPlugins;
- QSet<KFileItem> m_pendingVisibleItems;
- QSet<KFileItem> m_pendingInvisibleItems;
- QList<KJob*> m_previewJobs;
+ // Items for which the sort role still has to be determined.
+ QSet<KFileItem> m_pendingSortRoleItems;
+
+ // Indexes of items which still have to be handled by
+ // resolveNextPendingRoles().
+ QList<int> m_pendingIndexes;
- QTimer* m_resolvePendingRolesTimer;
+ // Items which have been left over from the last call of startPreviewJob().
+ // A new preview job will be started from them once the first one finishes.
+ KFileItemList m_pendingPreviewItems;
+
+ KJob* m_previewJob;
+
+ // When downloading or copying large files, the slot slotItemsChanged()
+ // will be called periodically within a quite short delay. To prevent
+ // a high CPU-load by generating e.g. previews for each notification, the update
+ // will be postponed until no file change has been done within a longer period
+ // of time.
+ QTimer* m_recentlyChangedItemsTimer;
+ QSet<KFileItem> m_recentlyChangedItems;
+
+ // Items which have not been changed repeatedly recently.
+ QSet<KFileItem> m_changedItems;
+
+ KDirectoryContentsCounter* m_directoryContentsCounter;
+
+#ifdef HAVE_NEPOMUK
+ Nepomuk2::ResourceWatcher* m_nepomukResourceWatcher;
+ mutable QHash<QUrl, KUrl> m_nepomukUriItems;
+#endif
};
#endif
projects / dolphin.git / blobdiff