mirror of
https://invent.kde.org/system/dolphin
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fc0c3f9d4e
There was some code in KStandardItemListView::itemSizeHintUpdateRequired already that was supposed to prevent an expensive re-layouting of all items when a preview is received. However, it didn't quite work as intended because also the "iconOverlays" role changed. The new approach is to only re-layout if text of a visible role changes, because this is the only way how the space needed by an item might change (see KStandardItemListWidgetInformant::itemSizeHint()). BUG: 315315 FIXED-IN: 4.10.1 REVIEW: 108984
193 lines
6.3 KiB
C++
193 lines
6.3 KiB
C++
/***************************************************************************
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* Copyright (C) 2012 by Peter Penz <peter.penz19@gmail.com> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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***************************************************************************/
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#include "kstandarditemlistview.h"
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#include <KDebug>
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#include <KIconLoader>
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#include "kstandarditemlistwidget.h"
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#include "kstandarditemlistgroupheader.h"
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KStandardItemListView::KStandardItemListView(QGraphicsWidget* parent) :
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KItemListView(parent),
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m_itemLayout(DetailsLayout)
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{
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setAcceptDrops(true);
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setScrollOrientation(Qt::Vertical);
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setVisibleRoles(QList<QByteArray>() << "text");
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}
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KStandardItemListView::~KStandardItemListView()
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{
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}
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void KStandardItemListView::setItemLayout(ItemLayout layout)
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{
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if (m_itemLayout == layout) {
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return;
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}
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beginTransaction();
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const ItemLayout previous = m_itemLayout;
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m_itemLayout = layout;
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switch (layout) {
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case IconsLayout:
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setScrollOrientation(Qt::Vertical);
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setSupportsItemExpanding(false);
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break;
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case DetailsLayout:
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setScrollOrientation(Qt::Vertical);
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setSupportsItemExpanding(true);
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break;
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case CompactLayout:
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setScrollOrientation(Qt::Horizontal);
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setSupportsItemExpanding(false);
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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onItemLayoutChanged(layout, previous);
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endTransaction();
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}
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KStandardItemListView::ItemLayout KStandardItemListView::itemLayout() const
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{
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return m_itemLayout;
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}
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KItemListWidgetCreatorBase* KStandardItemListView::defaultWidgetCreator() const
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{
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return new KItemListWidgetCreator<KStandardItemListWidget>();
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}
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KItemListGroupHeaderCreatorBase* KStandardItemListView::defaultGroupHeaderCreator() const
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{
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return new KItemListGroupHeaderCreator<KStandardItemListGroupHeader>();
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}
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void KStandardItemListView::initializeItemListWidget(KItemListWidget* item)
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{
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KStandardItemListWidget* standardItemListWidget = qobject_cast<KStandardItemListWidget*>(item);
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Q_ASSERT(standardItemListWidget);
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switch (itemLayout()) {
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case IconsLayout: standardItemListWidget->setLayout(KStandardItemListWidget::IconsLayout); break;
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case CompactLayout: standardItemListWidget->setLayout(KStandardItemListWidget::CompactLayout); break;
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case DetailsLayout: standardItemListWidget->setLayout(KStandardItemListWidget::DetailsLayout); break;
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default: Q_ASSERT(false); break;
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}
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standardItemListWidget->setSupportsItemExpanding(supportsItemExpanding());
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}
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bool KStandardItemListView::itemSizeHintUpdateRequired(const QSet<QByteArray>& changedRoles) const
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{
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// The only thing that can modify the item's size hint is the amount of space
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// needed to display the text for the visible roles.
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// Even if the icons have a different size they are always aligned within
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// the area defined by KItemStyleOption.iconSize and hence result in no
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// change of the item-size.
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foreach (const QByteArray& role, visibleRoles()) {
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if (changedRoles.contains(role)) {
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return true;
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}
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}
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return false;
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}
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void KStandardItemListView::onItemLayoutChanged(ItemLayout current, ItemLayout previous)
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{
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Q_UNUSED(current);
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Q_UNUSED(previous);
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updateLayoutOfVisibleItems();
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}
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void KStandardItemListView::onScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
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{
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Q_UNUSED(current);
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Q_UNUSED(previous);
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updateLayoutOfVisibleItems();
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}
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void KStandardItemListView::onSupportsItemExpandingChanged(bool supportsExpanding)
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{
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Q_UNUSED(supportsExpanding);
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updateLayoutOfVisibleItems();
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}
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void KStandardItemListView::polishEvent()
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{
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switch (m_itemLayout) {
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case IconsLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_LargeIconSize), 2, 4, 8); break;
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case CompactLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize), 2, 8, 0); break;
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case DetailsLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize), 2, 0, 0); break;
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default: Q_ASSERT(false); break;
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}
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QGraphicsWidget::polishEvent();
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}
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void KStandardItemListView::applyDefaultStyleOption(int iconSize,
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int padding,
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int horizontalMargin,
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int verticalMargin)
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{
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KItemListStyleOption option = styleOption();
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bool changed = false;
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if (option.iconSize < 0) {
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option.iconSize = iconSize;
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changed = true;
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}
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if (option.padding < 0) {
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option.padding = padding;
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changed = true;
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}
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if (option.horizontalMargin < 0) {
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option.horizontalMargin = horizontalMargin;
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changed = true;
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}
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if (option.verticalMargin < 0) {
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option.verticalMargin = verticalMargin;
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changed = true;
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}
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if (changed) {
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setStyleOption(option);
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}
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}
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void KStandardItemListView::updateLayoutOfVisibleItems()
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{
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if (model()) {
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foreach (KItemListWidget* widget, visibleItemListWidgets()) {
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initializeItemListWidget(widget);
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}
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}
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}
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#include "kstandarditemlistview.moc"
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