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Load unknown icons for items just before showing items in the view

Browse source 
Rather than loading many icons (without full mime type determination)
in advance, we make sure that an item has an icon just before it is
shown in the view. This makes sure that no "unknown" icons are shown
unnecessarily, and saves some resources.

REVIEW: 111396
This commit is contained in:
Frank Reininghaus 2013-07-12 08:27:04 +02:00
parent 6028bd7cf6
commit 63b26cbf2c
4 changed files with 20 additions and 86 deletions
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16
src/kitemviews/kfileitemlistview.cpp
View file

@ -190,6 +190,22 @@ KItemListWidgetCreatorBase* KFileItemListView::defaultWidgetCreator() const
return new KItemListWidgetCreator<KFileItemListWidget>();
}
void KFileItemListView::initializeItemListWidget(KItemListWidget* item)
{
KStandardItemListView::initializeItemListWidget(item);
// Make sure that the item has an icon.
QHash<QByteArray, QVariant> data = item->data();
if (!data.contains("iconName") && data["iconPixmap"].value<QPixmap>().isNull()) {
Q_ASSERT(qobject_cast<KFileItemModel*>(model()));
KFileItemModel* fileItemModel = static_cast<KFileItemModel*>(model());
const KFileItem fileItem = fileItemModel->fileItem(item->index());
data.insert("iconName", fileItem.iconName());
item->setData(data, QSet<QByteArray>() << "iconName");
}
}
void KFileItemListView::onPreviewsShownChanged(bool shown)
{
Q_UNUSED(shown);

1
src/kitemviews/kfileitemlistview.h
View file

@ -77,6 +77,7 @@ public:
protected:
virtual KItemListWidgetCreatorBase* defaultWidgetCreator() const;
virtual void initializeItemListWidget(KItemListWidget* item);
virtual void onPreviewsShownChanged(bool shown);
virtual void onItemLayoutChanged(ItemLayout current, ItemLayout previous);
virtual void onModelChanged(KItemModelBase* current, KItemModelBase* previous);

78
src/kitemviews/kfileitemmodelrolesupdater.cpp
View file

@ -89,8 +89,6 @@ KFileItemModelRolesUpdater::KFileItemModelRolesUpdater(KFileItemModel* model, QO
m_resolvableRoles(),
m_enabledPlugins(),
m_pendingSortRoleItems(),
m_hasUnknownIcons(false),
m_firstIndexWithoutIcon(0),
m_pendingIndexes(),
m_pendingPreviewItems(),
m_previewJob(),
@ -333,10 +331,6 @@ void KFileItemModelRolesUpdater::slotItemsInserted(const KItemRangeList& itemRan
QElapsedTimer timer;
timer.start();
const int firstInsertedIndex = itemRanges.first().index;
m_firstIndexWithoutIcon = qMin(m_firstIndexWithoutIcon, firstInsertedIndex);
m_hasUnknownIcons = true;
// Determine the sort role synchronously for as many items as possible.
if (m_resolvableRoles.contains(m_model->sortRole())) {
int insertedCount = 0;
@ -373,11 +367,6 @@ void KFileItemModelRolesUpdater::slotItemsRemoved(const KItemRangeList& itemRang
const bool allItemsRemoved = (m_model->count() == 0);
if (m_hasUnknownIcons) {
const int firstRemovedIndex = itemRanges.first().index;
m_firstIndexWithoutIcon = qMin(m_firstIndexWithoutIcon, firstRemovedIndex);
}
if (!m_watchedDirs.isEmpty()) {
// Don't let KDirWatch watch for removed items
if (allItemsRemoved) {
@ -459,11 +448,6 @@ void KFileItemModelRolesUpdater::slotItemsMoved(const KItemRange& itemRange, QLi
Q_UNUSED(itemRange);
Q_UNUSED(movedToIndexes);
if (m_hasUnknownIcons) {
const int firstMovedIndex = itemRange.index;
m_firstIndexWithoutIcon = qMin(m_firstIndexWithoutIcon, firstMovedIndex);
}
// The visible items might have changed.
startUpdating();
}
@ -829,13 +813,6 @@ void KFileItemModelRolesUpdater::startUpdating()
// Determine the icons for the visible items synchronously.
updateVisibleIcons();
// Try to do at least a fast icon loading (without determining the
// mime type) for all items, to reduce the risk that the user sees
// "unknown" icons when scrolling.
if (m_hasUnknownIcons) {
updateAllIconsFast(MaxBlockTimeout - timer.elapsed());
}
// A detailed update of the items in and near the visible area
// only makes sense if sorting is finished.
if (m_state == ResolvingSortRole) {
@ -887,58 +864,9 @@ void KFileItemModelRolesUpdater::updateVisibleIcons()
applyResolvedRoles(item, ResolveFast);
}
if (index > lastVisibleIndex) {
return;
}
// If this didn't work before MaxBlockTimeout was reached, at least
// prevent that the user sees 'unknown' icons.
disconnect(m_model, SIGNAL(itemsChanged(KItemRangeList,QSet<QByteArray>)),
this, SLOT(slotItemsChanged(KItemRangeList,QSet<QByteArray>)));
while (index <= lastVisibleIndex) {
if (!m_model->data(index).contains("iconName")) {
const KFileItem item = m_model->fileItem(index);
QHash<QByteArray, QVariant> data;
data.insert("iconName", item.iconName());
m_model->setData(index, data);
}
++index;
}
connect(m_model, SIGNAL(itemsChanged(KItemRangeList,QSet<QByteArray>)),
this, SLOT(slotItemsChanged(KItemRangeList,QSet<QByteArray>)));
}
void KFileItemModelRolesUpdater::updateAllIconsFast(int timeout)
{
if (timeout <= 0) {
return;
}
QElapsedTimer timer;
timer.start();
disconnect(m_model, SIGNAL(itemsChanged(KItemRangeList,QSet<QByteArray>)),
this, SLOT(slotItemsChanged(KItemRangeList,QSet<QByteArray>)));
const int count = m_model->count();
while (m_firstIndexWithoutIcon < count && timer.elapsed() < timeout) {
if (!m_model->data(m_firstIndexWithoutIcon).contains("iconName")) {
const KFileItem item = m_model->fileItem(m_firstIndexWithoutIcon);
QHash<QByteArray, QVariant> data;
data.insert("iconName", item.iconName());
m_model->setData(m_firstIndexWithoutIcon, data);
}
++m_firstIndexWithoutIcon;
}
if (m_firstIndexWithoutIcon == count) {
m_hasUnknownIcons = false;
}
connect(m_model, SIGNAL(itemsChanged(KItemRangeList,QSet<QByteArray>)),
this, SLOT(slotItemsChanged(KItemRangeList,QSet<QByteArray>)));
// KFileItemListView::initializeItemListWidget(KItemListWidget*) will load
// preliminary icons (i.e., without mime type determination) for the
// remaining items.
}
void KFileItemModelRolesUpdater::startPreviewJob()

11
src/kitemviews/kfileitemmodelrolesupdater.h
View file

@ -232,12 +232,6 @@ private:
*/
void updateVisibleIcons();
/**
* Tries to load at least preliminary icons (without determining the
* mime type) for all items for \a timeout milliseconds.
*/
void updateAllIconsFast(int timeout);
/**
* Creates previews for the items starting from the first item in
* m_pendingPreviewItems.
@ -326,11 +320,6 @@ private:
// Items for which the sort role still has to be determined.
QSet<KFileItem> m_pendingSortRoleItems;
// Determines if the next call of startUpdating() will try to do a fast
// icon loading (i.e., without determining the mime type) for all items.
bool m_hasUnknownIcons;
int m_firstIndexWithoutIcon;
// Indexes of items which still have to be handled by
// resolveNextPendingRoles().
QList<int> m_pendingIndexes;