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These rights are described in the Digia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qlistview.h" #ifndef QT_NO_LISTVIEW #include #include #include #include #include #include #include #include #include #include #include #ifndef QT_NO_ACCESSIBILITY #include #endif QT_BEGIN_NAMESPACE /*! \class QListView \brief The QListView class provides a list or icon view onto a model. \ingroup model-view \ingroup advanced A QListView presents items stored in a model, either as a simple non-hierarchical list, or as a collection of icons. This class is used to provide lists and icon views that were previously provided by the \c QListBox and \c QIconView classes, but using the more flexible approach provided by Qt's model/view architecture. The QListView class is one of the \l{Model/View Classes} and is part of Qt's \l{Model/View Programming}{model/view framework}. This view does not display horizontal or vertical headers; to display a list of items with a horizontal header, use QTreeView instead. QListView implements the interfaces defined by the QAbstractItemView class to allow it to display data provided by models derived from the QAbstractItemModel class. Items in a list view can be displayed using one of two view modes: In \l ListMode, the items are displayed in the form of a simple list; in \l IconMode, the list view takes the form of an \e{icon view} in which the items are displayed with icons like files in a file manager. By default, the list view is in \l ListMode. To change the view mode, use the setViewMode() function, and to determine the current view mode, use viewMode(). Items in these views are laid out in the direction specified by the flow() of the list view. The items may be fixed in place, or allowed to move, depending on the view's movement() state. If the items in the model cannot be completely laid out in the direction of flow, they can be wrapped at the boundary of the view widget; this depends on isWrapping(). This property is useful when the items are being represented by an icon view. The resizeMode() and layoutMode() govern how and when the items are laid out. Items are spaced according to their spacing(), and can exist within a notional grid of size specified by gridSize(). The items can be rendered as large or small icons depending on their iconSize(). \table 100% \row \o \inlineimage windowsxp-listview.png Screenshot of a Windows XP style list view \o \inlineimage macintosh-listview.png Screenshot of a Macintosh style table view \o \inlineimage plastique-listview.png Screenshot of a Plastique style table view \row \o A \l{Windows XP Style Widget Gallery}{Windows XP style} list view. \o A \l{Macintosh Style Widget Gallery}{Macintosh style} list view. \o A \l{Plastique Style Widget Gallery}{Plastique style} list view. \endtable \section1 Improving Performance It is possible to give the view hints about the data it is handling in order to improve its performance when displaying large numbers of items. One approach that can be taken for views that are intended to display items with equal sizes is to set the \l uniformItemSizes property to true. \sa {View Classes}, QTreeView, QTableView, QListWidget */ /*! \enum QListView::ViewMode \value ListMode The items are laid out using TopToBottom flow, with Small size and Static movement \value IconMode The items are laid out using LeftToRight flow, with Large size and Free movement */ /*! \enum QListView::Movement \value Static The items cannot be moved by the user. \value Free The items can be moved freely by the user. \value Snap The items snap to the specified grid when moved; see setGridSize(). */ /*! \enum QListView::Flow \value LeftToRight The items are laid out in the view from the left to the right. \value TopToBottom The items are laid out in the view from the top to the bottom. */ /*! \enum QListView::ResizeMode \value Fixed The items will only be laid out the first time the view is shown. \value Adjust The items will be laid out every time the view is resized. */ /*! \enum QListView::LayoutMode \value SinglePass The items are laid out all at once. \value Batched The items are laid out in batches of \l batchSize items. \sa batchSize */ /*! \since 4.2 \fn void QListView::indexesMoved(const QModelIndexList &indexes) This signal is emitted when the specified \a indexes are moved in the view. */ /*! Creates a new QListView with the given \a parent to view a model. Use setModel() to set the model. */ QListView::QListView(QWidget *parent) : QAbstractItemView(*new QListViewPrivate, parent) { setViewMode(ListMode); setSelectionMode(SingleSelection); setAttribute(Qt::WA_MacShowFocusRect); Q_D(QListView); // We rely on a qobject_cast for PM_DefaultFrameWidth to change d->updateStyledFrameWidths(); // hence we have to force an update now that the object has been constructed } /*! \internal */ QListView::QListView(QListViewPrivate &dd, QWidget *parent) : QAbstractItemView(dd, parent) { setViewMode(ListMode); setSelectionMode(SingleSelection); setAttribute(Qt::WA_MacShowFocusRect); Q_D(QListView); // We rely on a qobject_cast for PM_DefaultFrameWidth to change d->updateStyledFrameWidths(); // hence we have to force an update now that the object has been constructed } /*! Destroys the view. */ QListView::~QListView() { } /*! \property QListView::movement \brief whether the items can be moved freely, are snapped to a grid, or cannot be moved at all. This property determines how the user can move the items in the view. \l Static means that the items can't be moved the user. \l Free means that the user can drag and drop the items to any position in the view. \l Snap means that the user can drag and drop the items, but only to the positions in a notional grid signified by the gridSize property. Setting this property when the view is visible will cause the items to be laid out again. By default, this property is set to \l Static. \sa gridSize, resizeMode, viewMode */ void QListView::setMovement(Movement movement) { Q_D(QListView); d->modeProperties |= uint(QListViewPrivate::Movement); d->movement = movement; #ifndef QT_NO_DRAGANDDROP bool movable = (movement != Static); setDragEnabled(movable); d->viewport->setAcceptDrops(movable); #endif d->doDelayedItemsLayout(); } QListView::Movement QListView::movement() const { Q_D(const QListView); return d->movement; } /*! \property QListView::flow \brief which direction the items layout should flow. If this property is \l LeftToRight, the items will be laid out left to right. If the \l isWrapping property is true, the layout will wrap when it reaches the right side of the visible area. If this property is \l TopToBottom, the items will be laid out from the top of the visible area, wrapping when it reaches the bottom. Setting this property when the view is visible will cause the items to be laid out again. By default, this property is set to \l TopToBottom. \sa viewMode */ void QListView::setFlow(Flow flow) { Q_D(QListView); d->modeProperties |= uint(QListViewPrivate::Flow); d->flow = flow; d->doDelayedItemsLayout(); } QListView::Flow QListView::flow() const { Q_D(const QListView); return d->flow; } /*! \property QListView::isWrapping \brief whether the items layout should wrap. This property holds whether the layout should wrap when there is no more space in the visible area. The point at which the layout wraps depends on the \l flow property. Setting this property when the view is visible will cause the items to be laid out again. By default, this property is false. \sa viewMode */ void QListView::setWrapping(bool enable) { Q_D(QListView); d->modeProperties |= uint(QListViewPrivate::Wrap); d->setWrapping(enable); d->doDelayedItemsLayout(); } bool QListView::isWrapping() const { Q_D(const QListView); return d->isWrapping(); } /*! \property QListView::resizeMode \brief whether the items are laid out again when the view is resized. If this property is \l Adjust, the items will be laid out again when the view is resized. If the value is \l Fixed, the items will not be laid out when the view is resized. By default, this property is set to \l Fixed. \sa movement, gridSize, viewMode */ void QListView::setResizeMode(ResizeMode mode) { Q_D(QListView); d->modeProperties |= uint(QListViewPrivate::ResizeMode); d->resizeMode = mode; } QListView::ResizeMode QListView::resizeMode() const { Q_D(const QListView); return d->resizeMode; } /*! \property QListView::layoutMode \brief determines whether the layout of items should happen immediately or be delayed. This property holds the layout mode for the items. When the mode is \l SinglePass (the default), the items are laid out all in one go. When the mode is \l Batched, the items are laid out in batches of \l batchSize items, while processing events. This makes it possible to instantly view and interact with the visible items while the rest are being laid out. \sa viewMode */ void QListView::setLayoutMode(LayoutMode mode) { Q_D(QListView); d->layoutMode = mode; } QListView::LayoutMode QListView::layoutMode() const { Q_D(const QListView); return d->layoutMode; } /*! \property QListView::spacing \brief the space around the items in the layout This property is the size of the empty space that is padded around an item in the layout. Setting this property when the view is visible will cause the items to be laid out again. By default, this property contains a value of 0. \sa viewMode */ // ### Qt5: Use same semantic as layouts (spacing is the size of space // *between* items) void QListView::setSpacing(int space) { Q_D(QListView); d->modeProperties |= uint(QListViewPrivate::Spacing); d->setSpacing(space); d->doDelayedItemsLayout(); } int QListView::spacing() const { Q_D(const QListView); return d->spacing(); } /*! \property QListView::batchSize \brief the number of items laid out in each batch if \l layoutMode is set to \l Batched The default value is 100. \since 4.2 */ void QListView::setBatchSize(int batchSize) { Q_D(QListView); if (batchSize <= 0) { qWarning("Invalid batchSize (%d)", batchSize); return; } d->batchSize = batchSize; } int QListView::batchSize() const { Q_D(const QListView); return d->batchSize; } /*! \property QListView::gridSize \brief the size of the layout grid This property is the size of the grid in which the items are laid out. The default is an empty size which means that there is no grid and the layout is not done in a grid. Setting this property to a non-empty size switches on the grid layout. (When a grid layout is in force the \l spacing property is ignored.) Setting this property when the view is visible will cause the items to be laid out again. \sa viewMode */ void QListView::setGridSize(const QSize &size) { Q_D(QListView); d->modeProperties |= uint(QListViewPrivate::GridSize); d->setGridSize(size); d->doDelayedItemsLayout(); } QSize QListView::gridSize() const { Q_D(const QListView); return d->gridSize(); } /*! \property QListView::viewMode \brief the view mode of the QListView. This property will change the other unset properties to conform with the set view mode. QListView-specific properties that have already been set will not be changed, unless clearPropertyFlags() has been called. Setting the view mode will enable or disable drag and drop based on the selected movement. For ListMode, the default movement is \l Static (drag and drop disabled); for IconMode, the default movement is \l Free (drag and drop enabled). \sa isWrapping, spacing, gridSize, flow, movement, resizeMode */ void QListView::setViewMode(ViewMode mode) { Q_D(QListView); if (d->commonListView && d->viewMode == mode) return; d->viewMode = mode; delete d->commonListView; if (mode == ListMode) { d->commonListView = new QListModeViewBase(this, d); if (!(d->modeProperties & QListViewPrivate::Wrap)) d->setWrapping(false); if (!(d->modeProperties & QListViewPrivate::Spacing)) d->setSpacing(0); if (!(d->modeProperties & QListViewPrivate::GridSize)) d->setGridSize(QSize()); if (!(d->modeProperties & QListViewPrivate::Flow)) d->flow = TopToBottom; if (!(d->modeProperties & QListViewPrivate::Movement)) d->movement = Static; if (!(d->modeProperties & QListViewPrivate::ResizeMode)) d->resizeMode = Fixed; if (!(d->modeProperties & QListViewPrivate::SelectionRectVisible)) d->showElasticBand = false; } else { d->commonListView = new QIconModeViewBase(this, d); if (!(d->modeProperties & QListViewPrivate::Wrap)) d->setWrapping(true); if (!(d->modeProperties & QListViewPrivate::Spacing)) d->setSpacing(0); if (!(d->modeProperties & QListViewPrivate::GridSize)) d->setGridSize(QSize()); if (!(d->modeProperties & QListViewPrivate::Flow)) d->flow = LeftToRight; if (!(d->modeProperties & QListViewPrivate::Movement)) d->movement = Free; if (!(d->modeProperties & QListViewPrivate::ResizeMode)) d->resizeMode = Fixed; if (!(d->modeProperties & QListViewPrivate::SelectionRectVisible)) d->showElasticBand = true; } #ifndef QT_NO_DRAGANDDROP bool movable = (d->movement != Static); setDragEnabled(movable); setAcceptDrops(movable); #endif d->clear(); d->doDelayedItemsLayout(); } QListView::ViewMode QListView::viewMode() const { Q_D(const QListView); return d->viewMode; } /*! Clears the QListView-specific property flags. See \l{viewMode}. Properties inherited from QAbstractItemView are not covered by the property flags. Specifically, \l{QAbstractItemView::dragEnabled} {dragEnabled} and \l{QAbstractItemView::acceptDrops} {acceptsDrops} are computed by QListView when calling setMovement() or setViewMode(). */ void QListView::clearPropertyFlags() { Q_D(QListView); d->modeProperties = 0; } /*! Returns true if the \a row is hidden; otherwise returns false. */ bool QListView::isRowHidden(int row) const { Q_D(const QListView); return d->isHidden(row); } /*! If \a hide is true, the given \a row will be hidden; otherwise the \a row will be shown. */ void QListView::setRowHidden(int row, bool hide) { Q_D(QListView); const bool hidden = d->isHidden(row); if (hide && !hidden) d->commonListView->appendHiddenRow(row); else if (!hide && hidden) d->commonListView->removeHiddenRow(row); d->doDelayedItemsLayout(); d->viewport->update(); } /*! \reimp */ QRect QListView::visualRect(const QModelIndex &index) const { Q_D(const QListView); return d->mapToViewport(rectForIndex(index)); } /*! \reimp */ void QListView::scrollTo(const QModelIndex &index, ScrollHint hint) { Q_D(QListView); if (index.parent() != d->root || index.column() != d->column) return; const QRect rect = visualRect(index); if (hint == EnsureVisible && d->viewport->rect().contains(rect)) { d->viewport->update(rect); return; } if (d->flow == QListView::TopToBottom || d->isWrapping()) // vertical verticalScrollBar()->setValue(d->verticalScrollToValue(index, rect, hint)); if (d->flow == QListView::LeftToRight || d->isWrapping()) // horizontal horizontalScrollBar()->setValue(d->horizontalScrollToValue(index, rect, hint)); } int QListViewPrivate::horizontalScrollToValue(const QModelIndex &index, const QRect &rect, QListView::ScrollHint hint) const { Q_Q(const QListView); const QRect area = viewport->rect(); const bool leftOf = q->isRightToLeft() ? (rect.left() < area.left()) && (rect.right() < area.right()) : rect.left() < area.left(); const bool rightOf = q->isRightToLeft() ? rect.right() > area.right() : (rect.right() > area.right()) && (rect.left() > area.left()); return commonListView->horizontalScrollToValue(q->visualIndex(index), hint, leftOf, rightOf, area, rect); } int QListViewPrivate::verticalScrollToValue(const QModelIndex &index, const QRect &rect, QListView::ScrollHint hint) const { Q_Q(const QListView); const QRect area = viewport->rect(); const bool above = (hint == QListView::EnsureVisible && rect.top() < area.top()); const bool below = (hint == QListView::EnsureVisible && rect.bottom() > area.bottom()); return commonListView->verticalScrollToValue(q->visualIndex(index), hint, above, below, area, rect); } void QListViewPrivate::selectAll(QItemSelectionModel::SelectionFlags command) { if (!selectionModel) return; QItemSelection selection; QModelIndex topLeft; int row = 0; const int colCount = model->columnCount(root); for(; row < model->rowCount(root); ++row) { if (isHidden(row)) { //it might be the end of a selection range if (topLeft.isValid()) { QModelIndex bottomRight = model->index(row - 1, colCount - 1, root); selection.append(QItemSelectionRange(topLeft, bottomRight)); topLeft = QModelIndex(); } continue; } if (!topLeft.isValid()) //start of a new selection range topLeft = model->index(row, 0, root); } if (topLeft.isValid()) { //last selected range QModelIndex bottomRight = model->index(row - 1, colCount - 1, root); selection.append(QItemSelectionRange(topLeft, bottomRight)); } if (!selection.isEmpty()) selectionModel->select(selection, command); } /*! \reimp We have a QListView way of knowing what elements are on the viewport through the intersectingSet function */ QItemViewPaintPairs QListViewPrivate::draggablePaintPairs(const QModelIndexList &indexes, QRect *r) const { Q_ASSERT(r); Q_Q(const QListView); QRect &rect = *r; const QRect viewportRect = viewport->rect(); QItemViewPaintPairs ret; const QSet visibleIndexes = intersectingSet(viewportRect).toList().toSet(); for (int i = 0; i < indexes.count(); ++i) { const QModelIndex &index = indexes.at(i); if (visibleIndexes.contains(index)) { const QRect current = q->visualRect(index); ret += qMakePair(current, index); rect |= current; } } rect &= viewportRect; return ret; } /*! \internal */ void QListView::reset() { Q_D(QListView); d->clear(); d->hiddenRows.clear(); QAbstractItemView::reset(); } /*! \internal */ void QListView::setRootIndex(const QModelIndex &index) { Q_D(QListView); d->column = qBound(0, d->column, d->model->columnCount(index) - 1); QAbstractItemView::setRootIndex(index); // sometimes we get an update before reset() is called d->clear(); d->hiddenRows.clear(); } /*! \internal Scroll the view contents by \a dx and \a dy. */ void QListView::scrollContentsBy(int dx, int dy) { Q_D(QListView); d->delayedAutoScroll.stop(); // auto scroll was canceled by the user scrolling d->commonListView->scrollContentsBy(dx, dy, d->state == QListView::DragSelectingState); } /*! \internal Resize the internal contents to \a width and \a height and set the scroll bar ranges accordingly. */ void QListView::resizeContents(int width, int height) { Q_D(QListView); d->setContentsSize(width, height); } /*! \internal */ QSize QListView::contentsSize() const { Q_D(const QListView); return d->contentsSize(); } /*! \reimp */ void QListView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight) { d_func()->commonListView->dataChanged(topLeft, bottomRight); QAbstractItemView::dataChanged(topLeft, bottomRight); } /*! \reimp */ void QListView::rowsInserted(const QModelIndex &parent, int start, int end) { Q_D(QListView); // ### be smarter about inserted items d->clear(); d->doDelayedItemsLayout(); QAbstractItemView::rowsInserted(parent, start, end); } /*! \reimp */ void QListView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) { Q_D(QListView); // if the parent is above d->root in the tree, nothing will happen QAbstractItemView::rowsAboutToBeRemoved(parent, start, end); if (parent == d->root) { QSet::iterator it = d->hiddenRows.begin(); while (it != d->hiddenRows.end()) { int hiddenRow = it->row(); if (hiddenRow >= start && hiddenRow <= end) { it = d->hiddenRows.erase(it); } else { ++it; } } } d->clear(); d->doDelayedItemsLayout(); } /*! \reimp */ void QListView::mouseMoveEvent(QMouseEvent *e) { if (!isVisible()) return; Q_D(QListView); QAbstractItemView::mouseMoveEvent(e); if (state() == DragSelectingState && d->showElasticBand && d->selectionMode != SingleSelection && d->selectionMode != NoSelection) { QRect rect(d->pressedPosition, e->pos() + QPoint(horizontalOffset(), verticalOffset())); rect = rect.normalized(); d->viewport->update(d->mapToViewport(rect.united(d->elasticBand))); d->elasticBand = rect; } } /*! \reimp */ void QListView::mouseReleaseEvent(QMouseEvent *e) { Q_D(QListView); QAbstractItemView::mouseReleaseEvent(e); // #### move this implementation into a dynamic class if (d->showElasticBand && d->elasticBand.isValid()) { d->viewport->update(d->mapToViewport(d->elasticBand)); d->elasticBand = QRect(); } } /*! \reimp */ void QListView::timerEvent(QTimerEvent *e) { Q_D(QListView); if (e->timerId() == d->batchLayoutTimer.timerId()) { if (d->doItemsLayout(d->batchSize)) { // layout is done d->batchLayoutTimer.stop(); updateGeometries(); d->viewport->update(); } } QAbstractItemView::timerEvent(e); } /*! \reimp */ void QListView::resizeEvent(QResizeEvent *e) { Q_D(QListView); if (d->delayedPendingLayout) return; QSize delta = e->size() - e->oldSize(); if (delta.isNull()) return; bool listWrap = (d->viewMode == ListMode) && d->wrapItemText; bool flowDimensionChanged = (d->flow == LeftToRight && delta.width() != 0) || (d->flow == TopToBottom && delta.height() != 0); // We post a delayed relayout in the following cases : // - we're wrapping // - the state is NoState, we're adjusting and the size has changed in the flowing direction if (listWrap || (state() == NoState && d->resizeMode == Adjust && flowDimensionChanged)) { d->doDelayedItemsLayout(100); // wait 1/10 sec before starting the layout } else { QAbstractItemView::resizeEvent(e); } } #ifndef QT_NO_DRAGANDDROP /*! \reimp */ void QListView::dragMoveEvent(QDragMoveEvent *e) { Q_D(QListView); if (!d->commonListView->filterDragMoveEvent(e)) { if (viewMode() == QListView::ListMode && flow() == QListView::LeftToRight) static_cast(d->commonListView)->dragMoveEvent(e); else QAbstractItemView::dragMoveEvent(e); } } /*! \reimp */ void QListView::dragLeaveEvent(QDragLeaveEvent *e) { if (!d_func()->commonListView->filterDragLeaveEvent(e)) QAbstractItemView::dragLeaveEvent(e); } /*! \reimp */ void QListView::dropEvent(QDropEvent *e) { if (!d_func()->commonListView->filterDropEvent(e)) QAbstractItemView::dropEvent(e); } /*! \reimp */ void QListView::startDrag(Qt::DropActions supportedActions) { if (!d_func()->commonListView->filterStartDrag(supportedActions)) QAbstractItemView::startDrag(supportedActions); } /*! \internal Called whenever items from the view is dropped on the viewport. The \a event provides additional information. */ void QListView::internalDrop(QDropEvent *event) { // ### Qt5: remove that function Q_UNUSED(event); } /*! \internal Called whenever the user starts dragging items and the items are movable, enabling internal dragging and dropping of items. */ void QListView::internalDrag(Qt::DropActions supportedActions) { // ### Qt5: remove that function Q_UNUSED(supportedActions); } #endif // QT_NO_DRAGANDDROP /*! \reimp */ QStyleOptionViewItem QListView::viewOptions() const { Q_D(const QListView); QStyleOptionViewItem option = QAbstractItemView::viewOptions(); if (!d->iconSize.isValid()) { // otherwise it was already set in abstractitemview int pm = (d->viewMode == ListMode ? style()->pixelMetric(QStyle::PM_ListViewIconSize, 0, this) : style()->pixelMetric(QStyle::PM_IconViewIconSize, 0, this)); option.decorationSize = QSize(pm, pm); } if (d->viewMode == IconMode) { option.showDecorationSelected = false; option.decorationPosition = QStyleOptionViewItem::Top; option.displayAlignment = Qt::AlignCenter; } else { option.decorationPosition = QStyleOptionViewItem::Left; } if (d->gridSize().isValid()) { option.rect.setSize(d->gridSize()); } return option; } /*! \reimp */ void QListView::paintEvent(QPaintEvent *e) { Q_D(QListView); if (!d->itemDelegate) return; QStyleOptionViewItemV4 option = d->viewOptionsV4(); QPainter painter(d->viewport); const QVector toBeRendered = d->intersectingSet(e->rect().translated(horizontalOffset(), verticalOffset()), false); const QModelIndex current = currentIndex(); const QModelIndex hover = d->hover; const QAbstractItemModel *itemModel = d->model; const QItemSelectionModel *selections = d->selectionModel; const bool focus = (hasFocus() || d->viewport->hasFocus()) && current.isValid(); const bool alternate = d->alternatingColors; const QStyle::State state = option.state; const QAbstractItemView::State viewState = this->state(); const bool enabled = (state & QStyle::State_Enabled) != 0; bool alternateBase = false; int previousRow = -2; // trigger the alternateBase adjustment on first pass int maxSize = (flow() == TopToBottom) ? qMax(viewport()->size().width(), d->contentsSize().width()) - 2 * d->spacing() : qMax(viewport()->size().height(), d->contentsSize().height()) - 2 * d->spacing(); QVector::const_iterator end = toBeRendered.constEnd(); for (QVector::const_iterator it = toBeRendered.constBegin(); it != end; ++it) { Q_ASSERT((*it).isValid()); option.rect = visualRect(*it); if (flow() == TopToBottom) option.rect.setWidth(qMin(maxSize, option.rect.width())); else option.rect.setHeight(qMin(maxSize, option.rect.height())); option.state = state; if (selections && selections->isSelected(*it)) option.state |= QStyle::State_Selected; if (enabled) { QPalette::ColorGroup cg; if ((itemModel->flags(*it) & Qt::ItemIsEnabled) == 0) { option.state &= ~QStyle::State_Enabled; cg = QPalette::Disabled; } else { cg = QPalette::Normal; } option.palette.setCurrentColorGroup(cg); } if (focus && current == *it) { option.state |= QStyle::State_HasFocus; if (viewState == EditingState) option.state |= QStyle::State_Editing; } if (*it == hover) option.state |= QStyle::State_MouseOver; else option.state &= ~QStyle::State_MouseOver; if (alternate) { int row = (*it).row(); if (row != previousRow + 1) { // adjust alternateBase according to rows in the "gap" if (!d->hiddenRows.isEmpty()) { for (int r = qMax(previousRow + 1, 0); r < row; ++r) { if (!d->isHidden(r)) alternateBase = !alternateBase; } } else { alternateBase = (row & 1) != 0; } } if (alternateBase) { option.features |= QStyleOptionViewItemV2::Alternate; } else { option.features &= ~QStyleOptionViewItemV2::Alternate; } // draw background of the item (only alternate row). rest of the background // is provided by the delegate QStyle::State oldState = option.state; option.state &= ~QStyle::State_Selected; style()->drawPrimitive(QStyle::PE_PanelItemViewRow, &option, &painter, this); option.state = oldState; alternateBase = !alternateBase; previousRow = row; } d->delegateForIndex(*it)->paint(&painter, option, *it); } #ifndef QT_NO_DRAGANDDROP d->commonListView->paintDragDrop(&painter); #endif #ifndef QT_NO_RUBBERBAND // #### move this implementation into a dynamic class if (d->showElasticBand && d->elasticBand.isValid()) { QStyleOptionRubberBand opt; opt.initFrom(this); opt.shape = QRubberBand::Rectangle; opt.opaque = false; opt.rect = d->mapToViewport(d->elasticBand, false).intersected( d->viewport->rect().adjusted(-16, -16, 16, 16)); painter.save(); style()->drawControl(QStyle::CE_RubberBand, &opt, &painter); painter.restore(); } #endif } /*! \reimp */ QModelIndex QListView::indexAt(const QPoint &p) const { Q_D(const QListView); QRect rect(p.x() + horizontalOffset(), p.y() + verticalOffset(), 1, 1); const QVector intersectVector = d->intersectingSet(rect); QModelIndex index = intersectVector.count() > 0 ? intersectVector.last() : QModelIndex(); if (index.isValid() && visualRect(index).contains(p)) return index; return QModelIndex(); } /*! \reimp */ int QListView::horizontalOffset() const { return d_func()->commonListView->horizontalOffset(); } /*! \reimp */ int QListView::verticalOffset() const { return d_func()->commonListView->verticalOffset(); } /*! \reimp */ QModelIndex QListView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) { Q_D(QListView); Q_UNUSED(modifiers); QModelIndex current = currentIndex(); if (!current.isValid()) { int rowCount = d->model->rowCount(d->root); if (!rowCount) return QModelIndex(); int row = 0; while (row < rowCount && d->isHiddenOrDisabled(row)) ++row; if (row >= rowCount) return QModelIndex(); return d->model->index(row, d->column, d->root); } const QRect initialRect = rectForIndex(current); QRect rect = initialRect; if (rect.isEmpty()) { return d->model->index(0, d->column, d->root); } if (d->gridSize().isValid()) rect.setSize(d->gridSize()); QSize contents = d->contentsSize(); QVector intersectVector; switch (cursorAction) { case MoveLeft: while (intersectVector.isEmpty()) { rect.translate(-rect.width(), 0); if (rect.right() <= 0) return current; if (rect.left() < 0) rect.setLeft(0); intersectVector = d->intersectingSet(rect); d->removeCurrentAndDisabled(&intersectVector, current); } return d->closestIndex(initialRect, intersectVector); case MoveRight: while (intersectVector.isEmpty()) { rect.translate(rect.width(), 0); if (rect.left() >= contents.width()) return current; if (rect.right() > contents.width()) rect.setRight(contents.width()); intersectVector = d->intersectingSet(rect); d->removeCurrentAndDisabled(&intersectVector, current); } return d->closestIndex(initialRect, intersectVector); case MovePageUp: // move current by (visibileRowCount - 1) items. // rect.translate(0, -rect.height()); will happen in the switch fallthrough for MoveUp. rect.moveTop(rect.top() - d->viewport->height() + 2 * rect.height()); if (rect.top() < rect.height()) rect.moveTop(rect.height()); case MovePrevious: case MoveUp: while (intersectVector.isEmpty()) { rect.translate(0, -rect.height()); if (rect.bottom() <= 0) { #ifdef QT_KEYPAD_NAVIGATION if (QApplication::keypadNavigationEnabled()) { int row = d->batchStartRow() - 1; while (row >= 0 && d->isHiddenOrDisabled(row)) --row; if (row >= 0) return d->model->index(row, d->column, d->root); } #endif return current; } if (rect.top() < 0) rect.setTop(0); intersectVector = d->intersectingSet(rect); d->removeCurrentAndDisabled(&intersectVector, current); } return d->closestIndex(initialRect, intersectVector); case MovePageDown: // move current by (visibileRowCount - 1) items. // rect.translate(0, rect.height()); will happen in the switch fallthrough for MoveDown. rect.moveTop(rect.top() + d->viewport->height() - 2 * rect.height()); if (rect.bottom() > contents.height() - rect.height()) rect.moveBottom(contents.height() - rect.height()); case MoveNext: case MoveDown: while (intersectVector.isEmpty()) { rect.translate(0, rect.height()); if (rect.top() >= contents.height()) { #ifdef QT_KEYPAD_NAVIGATION if (QApplication::keypadNavigationEnabled()) { int rowCount = d->model->rowCount(d->root); int row = 0; while (row < rowCount && d->isHiddenOrDisabled(row)) ++row; if (row < rowCount) return d->model->index(row, d->column, d->root); } #endif return current; } if (rect.bottom() > contents.height()) rect.setBottom(contents.height()); intersectVector = d->intersectingSet(rect); d->removeCurrentAndDisabled(&intersectVector, current); } return d->closestIndex(initialRect, intersectVector); case MoveHome: return d->model->index(0, d->column, d->root); case MoveEnd: return d->model->index(d->batchStartRow() - 1, d->column, d->root);} return current; } /*! Returns the rectangle of the item at position \a index in the model. The rectangle is in contents coordinates. \sa visualRect() */ QRect QListView::rectForIndex(const QModelIndex &index) const { return d_func()->rectForIndex(index); } /*! \since 4.1 Sets the contents position of the item at \a index in the model to the given \a position. If the list view's movement mode is Static or its view mode is ListView, this function will have no effect. */ void QListView::setPositionForIndex(const QPoint &position, const QModelIndex &index) { Q_D(QListView); if (d->movement == Static || !d->isIndexValid(index) || index.parent() != d->root || index.column() != d->column) return; d->executePostedLayout(); d->commonListView->setPositionForIndex(position, index); } /*! \reimp */ void QListView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) { Q_D(QListView); if (!d->selectionModel) return; // if we are wrapping, we can only selecte inside the contents rectangle int w = qMax(d->contentsSize().width(), d->viewport->width()); int h = qMax(d->contentsSize().height(), d->viewport->height()); if (d->wrap && !QRect(0, 0, w, h).intersects(rect)) return; QItemSelection selection; if (rect.width() == 1 && rect.height() == 1) { const QVector intersectVector = d->intersectingSet(rect.translated(horizontalOffset(), verticalOffset())); QModelIndex tl; if (!intersectVector.isEmpty()) tl = intersectVector.last(); // special case for mouse press; only select the top item if (tl.isValid() && d->isIndexEnabled(tl)) selection.select(tl, tl); } else { if (state() == DragSelectingState) { // visual selection mode (rubberband selection) selection = d->selection(rect.translated(horizontalOffset(), verticalOffset())); } else { // logical selection mode (key and mouse click selection) QModelIndex tl, br; // get the first item const QRect topLeft(rect.left() + horizontalOffset(), rect.top() + verticalOffset(), 1, 1); QVector intersectVector = d->intersectingSet(topLeft); if (!intersectVector.isEmpty()) tl = intersectVector.last(); // get the last item const QRect bottomRight(rect.right() + horizontalOffset(), rect.bottom() + verticalOffset(), 1, 1); intersectVector = d->intersectingSet(bottomRight); if (!intersectVector.isEmpty()) br = intersectVector.last(); // get the ranges if (tl.isValid() && br.isValid() && d->isIndexEnabled(tl) && d->isIndexEnabled(br)) { QRect first = rectForIndex(tl); QRect last = rectForIndex(br); QRect middle; if (d->flow == LeftToRight) { QRect &top = first; QRect &bottom = last; // if bottom is above top, swap them if (top.center().y() > bottom.center().y()) { QRect tmp = top; top = bottom; bottom = tmp; } // if the rect are on differnet lines, expand if (top.top() != bottom.top()) { // top rectangle if (isRightToLeft()) top.setLeft(0); else top.setRight(contentsSize().width()); // bottom rectangle if (isRightToLeft()) bottom.setRight(contentsSize().width()); else bottom.setLeft(0); } else if (top.left() > bottom.right()) { if (isRightToLeft()) bottom.setLeft(top.right()); else bottom.setRight(top.left()); } else { if (isRightToLeft()) top.setLeft(bottom.right()); else top.setRight(bottom.left()); } // middle rectangle if (top.bottom() < bottom.top()) { if (gridSize().isValid() && !gridSize().isNull()) middle.setTop(top.top() + gridSize().height()); else middle.setTop(top.bottom() + 1); middle.setLeft(qMin(top.left(), bottom.left())); middle.setBottom(bottom.top() - 1); middle.setRight(qMax(top.right(), bottom.right())); } } else { // TopToBottom QRect &left = first; QRect &right = last; if (left.center().x() > right.center().x()) qSwap(left, right); int ch = contentsSize().height(); if (left.left() != right.left()) { // left rectangle if (isRightToLeft()) left.setTop(0); else left.setBottom(ch); // top rectangle if (isRightToLeft()) right.setBottom(ch); else right.setTop(0); // only set middle if the middle.setTop(0); middle.setBottom(ch); if (gridSize().isValid() && !gridSize().isNull()) middle.setLeft(left.left() + gridSize().width()); else middle.setLeft(left.right() + 1); middle.setRight(right.left() - 1); } else if (left.bottom() < right.top()) { left.setBottom(right.top() - 1); } else { right.setBottom(left.top() - 1); } } // do the selections QItemSelection topSelection = d->selection(first); QItemSelection middleSelection = d->selection(middle); QItemSelection bottomSelection = d->selection(last); // merge selection.merge(topSelection, QItemSelectionModel::Select); selection.merge(middleSelection, QItemSelectionModel::Select); selection.merge(bottomSelection, QItemSelectionModel::Select); } } } d->selectionModel->select(selection, command); } /*! \reimp Since 4.7, the returned region only contains rectangles intersecting (or included in) the viewport. */ QRegion QListView::visualRegionForSelection(const QItemSelection &selection) const { Q_D(const QListView); // ### NOTE: this is a potential bottleneck in non-static mode int c = d->column; QRegion selectionRegion; const QRect &viewportRect = d->viewport->rect(); for (int i = 0; i < selection.count(); ++i) { if (!selection.at(i).isValid()) continue; QModelIndex parent = selection.at(i).topLeft().parent(); //we only display the children of the root in a listview //we're not interested in the other model indexes if (parent != d->root) continue; int t = selection.at(i).topLeft().row(); int b = selection.at(i).bottomRight().row(); if (d->viewMode == IconMode || d->isWrapping()) { // in non-static mode, we have to go through all selected items for (int r = t; r <= b; ++r) { const QRect &rect = visualRect(d->model->index(r, c, parent)); if (viewportRect.intersects(rect)) selectionRegion += rect; } } else { // in static mode, we can optimize a bit while (t <= b && d->isHidden(t)) ++t; while (b >= t && d->isHidden(b)) --b; const QModelIndex top = d->model->index(t, c, parent); const QModelIndex bottom = d->model->index(b, c, parent); QRect rect(visualRect(top).topLeft(), visualRect(bottom).bottomRight()); if (viewportRect.intersects(rect)) selectionRegion += rect; } } return selectionRegion; } /*! \reimp */ QModelIndexList QListView::selectedIndexes() const { Q_D(const QListView); if (!d->selectionModel) return QModelIndexList(); QModelIndexList viewSelected = d->selectionModel->selectedIndexes(); for (int i = 0; i < viewSelected.count(); ++i) { const QModelIndex &index = viewSelected.at(i); if (!isIndexHidden(index) && index.parent() == d->root && index.column() == d->column) ++i; else viewSelected.removeAt(i); } return viewSelected; } /*! \internal Layout the items according to the flow and wrapping properties. */ void QListView::doItemsLayout() { Q_D(QListView); // showing the scroll bars will trigger a resize event, // so we set the state to expanding to avoid // triggering another layout QAbstractItemView::State oldState = state(); setState(ExpandingState); if (d->model->columnCount(d->root) > 0) { // no columns means no contents d->resetBatchStartRow(); if (layoutMode() == SinglePass) d->doItemsLayout(d->model->rowCount(d->root)); // layout everything else if (!d->batchLayoutTimer.isActive()) { if (!d->doItemsLayout(d->batchSize)) // layout is done d->batchLayoutTimer.start(0, this); // do a new batch as fast as possible } } QAbstractItemView::doItemsLayout(); setState(oldState); // restoring the oldState } /*! \reimp */ void QListView::updateGeometries() { Q_D(QListView); if (geometry().isEmpty() || d->model->rowCount(d->root) <= 0 || d->model->columnCount(d->root) <= 0) { horizontalScrollBar()->setRange(0, 0); verticalScrollBar()->setRange(0, 0); } else { QModelIndex index = d->model->index(0, d->column, d->root); QStyleOptionViewItemV4 option = d->viewOptionsV4(); QSize step = d->itemSize(option, index); d->commonListView->updateHorizontalScrollBar(step); d->commonListView->updateVerticalScrollBar(step); } QAbstractItemView::updateGeometries(); // if the scroll bars are turned off, we resize the contents to the viewport if (d->movement == Static && !d->isWrapping()) { d->layoutChildren(); // we need the viewport size to be updated if (d->flow == TopToBottom) { if (horizontalScrollBarPolicy() == Qt::ScrollBarAlwaysOff) { d->setContentsSize(viewport()->width(), contentsSize().height()); horizontalScrollBar()->setRange(0, 0); // we see all the contents anyway } } else { // LeftToRight if (verticalScrollBarPolicy() == Qt::ScrollBarAlwaysOff) { d->setContentsSize(contentsSize().width(), viewport()->height()); verticalScrollBar()->setRange(0, 0); // we see all the contents anyway } } } } /*! \reimp */ bool QListView::isIndexHidden(const QModelIndex &index) const { Q_D(const QListView); return (d->isHidden(index.row()) && (index.parent() == d->root) && index.column() == d->column); } /*! \property QListView::modelColumn \brief the column in the model that is visible By default, this property contains 0, indicating that the first column in the model will be shown. */ void QListView::setModelColumn(int column) { Q_D(QListView); if (column < 0 || column >= d->model->columnCount(d->root)) return; d->column = column; d->doDelayedItemsLayout(); } int QListView::modelColumn() const { Q_D(const QListView); return d->column; } /*! \property QListView::uniformItemSizes \brief whether all items in the listview have the same size \since 4.1 This property should only be set to true if it is guaranteed that all items in the view have the same size. This enables the view to do some optimizations for performance purposes. By default, this property is false. */ void QListView::setUniformItemSizes(bool enable) { Q_D(QListView); d->uniformItemSizes = enable; } bool QListView::uniformItemSizes() const { Q_D(const QListView); return d->uniformItemSizes; } /*! \property QListView::wordWrap \brief the item text word-wrapping policy \since 4.2 If this property is true then the item text is wrapped where necessary at word-breaks; otherwise it is not wrapped at all. This property is false by default. Please note that even if wrapping is enabled, the cell will not be expanded to make room for the text. It will print ellipsis for text that cannot be shown, according to the view's \l{QAbstractItemView::}{textElideMode}. */ void QListView::setWordWrap(bool on) { Q_D(QListView); if (d->wrapItemText == on) return; d->wrapItemText = on; d->doDelayedItemsLayout(); } bool QListView::wordWrap() const { Q_D(const QListView); return d->wrapItemText; } /*! \property QListView::selectionRectVisible \brief if the selection rectangle should be visible \since 4.3 If this property is true then the selection rectangle is visible; otherwise it will be hidden. \note The selection rectangle will only be visible if the selection mode is in a mode where more than one item can be selected; i.e., it will not draw a selection rectangle if the selection mode is QAbstractItemView::SingleSelection. By default, this property is false. */ void QListView::setSelectionRectVisible(bool show) { Q_D(QListView); d->modeProperties |= uint(QListViewPrivate::SelectionRectVisible); d->setSelectionRectVisible(show); } bool QListView::isSelectionRectVisible() const { Q_D(const QListView); return d->isSelectionRectVisible(); } /*! \reimp */ bool QListView::event(QEvent *e) { return QAbstractItemView::event(e); } /* * private object implementation */ QListViewPrivate::QListViewPrivate() : QAbstractItemViewPrivate(), commonListView(0), wrap(false), space(0), flow(QListView::TopToBottom), movement(QListView::Static), resizeMode(QListView::Fixed), layoutMode(QListView::SinglePass), viewMode(QListView::ListMode), modeProperties(0), column(0), uniformItemSizes(false), batchSize(100), showElasticBand(false) { } QListViewPrivate::~QListViewPrivate() { delete commonListView; } void QListViewPrivate::clear() { // initialization of data structs cachedItemSize = QSize(); commonListView->clear(); } void QListViewPrivate::prepareItemsLayout() { Q_Q(QListView); clear(); //take the size as if there were scrollbar in order to prevent scrollbar to blink layoutBounds = QRect(QPoint(), q->maximumViewportSize()); int frameAroundContents = 0; if (q->style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents)) frameAroundContents = q->style()->pixelMetric(QStyle::PM_DefaultFrameWidth) * 2; // maximumViewportSize() already takes scrollbar into account if policy is // Qt::ScrollBarAlwaysOn but scrollbar extent must be deduced if policy // is Qt::ScrollBarAsNeeded int verticalMargin = vbarpolicy==Qt::ScrollBarAsNeeded ? q->style()->pixelMetric(QStyle::PM_ScrollBarExtent, 0, vbar) + frameAroundContents : 0; int horizontalMargin = hbarpolicy==Qt::ScrollBarAsNeeded ? q->style()->pixelMetric(QStyle::PM_ScrollBarExtent, 0, hbar) + frameAroundContents : 0; layoutBounds.adjust(0, 0, -verticalMargin, -horizontalMargin); int rowCount = model->columnCount(root) <= 0 ? 0 : model->rowCount(root); commonListView->setRowCount(rowCount); } /*! \internal */ bool QListViewPrivate::doItemsLayout(int delta) { int max = model->rowCount(root) - 1; int first = batchStartRow(); int last = qMin(first + delta - 1, max); if (first == 0) { layoutChildren(); // make sure the viewport has the right size prepareItemsLayout(); } if (max < 0 || last < first) { return true; // nothing to do } QListViewLayoutInfo info; info.bounds = layoutBounds; info.grid = gridSize(); info.spacing = (info.grid.isValid() ? 0 : spacing()); info.first = first; info.last = last; info.wrap = isWrapping(); info.flow = flow; info.max = max; return commonListView->doBatchedItemLayout(info, max); } QListViewItem QListViewPrivate::indexToListViewItem(const QModelIndex &index) const { if (!index.isValid() || isHidden(index.row())) return QListViewItem(); return commonListView->indexToListViewItem(index); } QRect QListViewPrivate::mapToViewport(const QRect &rect, bool extend) const { Q_Q(const QListView); if (!rect.isValid()) return rect; QRect result = extend ? commonListView->mapToViewport(rect) : rect; int dx = -q->horizontalOffset(); int dy = -q->verticalOffset(); return result.adjusted(dx, dy, dx, dy); } QModelIndex QListViewPrivate::closestIndex(const QRect &target, const QVector &candidates) const { int distance = 0; int shortest = INT_MAX; QModelIndex closest; QVector::const_iterator it = candidates.begin(); for (; it != candidates.end(); ++it) { if (!(*it).isValid()) continue; const QRect indexRect = indexToListViewItem(*it).rect(); //if the center x (or y) position of an item is included in the rect of the other item, //we define the distance between them as the difference in x (or y) of their respective center. // Otherwise, we use the nahattan length between the 2 items if ((target.center().x() >= indexRect.x() && target.center().x() < indexRect.right()) || (indexRect.center().x() >= target.x() && indexRect.center().x() < target.right())) { //one item's center is at the vertical of the other distance = qAbs(indexRect.center().y() - target.center().y()); } else if ((target.center().y() >= indexRect.y() && target.center().y() < indexRect.bottom()) || (indexRect.center().y() >= target.y() && indexRect.center().y() < target.bottom())) { //one item's center is at the vertical of the other distance = qAbs(indexRect.center().x() - target.center().x()); } else { distance = (indexRect.center() - target.center()).manhattanLength(); } if (distance < shortest) { shortest = distance; closest = *it; } } return closest; } QSize QListViewPrivate::itemSize(const QStyleOptionViewItem &option, const QModelIndex &index) const { if (!uniformItemSizes) { const QAbstractItemDelegate *delegate = delegateForIndex(index); return delegate ? delegate->sizeHint(option, index) : QSize(); } if (!cachedItemSize.isValid()) { // the last item is probaly the largest, so we use its size int row = model->rowCount(root) - 1; QModelIndex sample = model->index(row, column, root); const QAbstractItemDelegate *delegate = delegateForIndex(sample); cachedItemSize = delegate ? delegate->sizeHint(option, sample) : QSize(); } return cachedItemSize; } QItemSelection QListViewPrivate::selection(const QRect &rect) const { QItemSelection selection; QModelIndex tl, br; const QVector intersectVector = intersectingSet(rect); QVector::const_iterator it = intersectVector.begin(); for (; it != intersectVector.end(); ++it) { if (!tl.isValid() && !br.isValid()) { tl = br = *it; } else if ((*it).row() == (tl.row() - 1)) { tl = *it; // expand current range } else if ((*it).row() == (br.row() + 1)) { br = (*it); // expand current range } else { selection.select(tl, br); // select current range tl = br = *it; // start new range } } if (tl.isValid() && br.isValid()) selection.select(tl, br); else if (tl.isValid()) selection.select(tl, tl); else if (br.isValid()) selection.select(br, br); return selection; } #ifndef QT_NO_DRAGANDDROP QAbstractItemView::DropIndicatorPosition QListViewPrivate::position(const QPoint &pos, const QRect &rect, const QModelIndex &idx) const { if (viewMode == QListView::ListMode && flow == QListView::LeftToRight) return static_cast(commonListView)->position(pos, rect, idx); else return QAbstractItemViewPrivate::position(pos, rect, idx); } bool QListViewPrivate::dropOn(QDropEvent *event, int *dropRow, int *dropCol, QModelIndex *dropIndex) { if (viewMode == QListView::ListMode && flow == QListView::LeftToRight) return static_cast(commonListView)->dropOn(event, dropRow, dropCol, dropIndex); else return QAbstractItemViewPrivate::dropOn(event, dropRow, dropCol, dropIndex); } #endif /* * Common ListView Implementation */ void QCommonListViewBase::appendHiddenRow(int row) { dd->hiddenRows.insert(dd->model->index(row, 0, qq->rootIndex())); } void QCommonListViewBase::removeHiddenRow(int row) { dd->hiddenRows.remove(dd->model->index(row, 0, qq->rootIndex())); } #ifndef QT_NO_DRAGANDDROP void QCommonListViewBase::paintDragDrop(QPainter *painter) { // FIXME: Until the we can provide a proper drop indicator // in IconMode, it makes no sense to show it dd->paintDropIndicator(painter); } #endif void QCommonListViewBase::updateHorizontalScrollBar(const QSize &step) { horizontalScrollBar()->setSingleStep(step.width() + spacing()); horizontalScrollBar()->setPageStep(viewport()->width()); // If both scroll bars are set to auto, we might end up in a situation with enough space // for the actual content. But still one of the scroll bars will become enabled due to // the other one using the space. The other one will become invisible in the same cycle. // -> Infinite loop, QTBUG-39902 const bool bothScrollBarsAuto = qq->verticalScrollBarPolicy() == Qt::ScrollBarAsNeeded && qq->horizontalScrollBarPolicy() == Qt::ScrollBarAsNeeded; if (bothScrollBarsAuto && contentsSize.width() - qq->verticalScrollBar()->width() <= viewport()->width() && contentsSize.height() - qq->horizontalScrollBar()->height() <= viewport()->height()) { // break the infinite loop described above by setting the range to 0, 0. // QAbstractScrollArea will then hide the scroll bar for us horizontalScrollBar()->setRange(0, 0); } else { horizontalScrollBar()->setRange(0, contentsSize.width() - viewport()->width()); } } void QCommonListViewBase::updateVerticalScrollBar(const QSize &step) { verticalScrollBar()->setSingleStep(step.height() + spacing()); verticalScrollBar()->setPageStep(viewport()->height()); // If both scroll bars are set to auto, we might end up in a situation with enough space // for the actual content. But still one of the scroll bars will become enabled due to // the other one using the space. The other one will become invisible in the same cycle. // -> Infinite loop, QTBUG-39902 const bool bothScrollBarsAuto = qq->verticalScrollBarPolicy() == Qt::ScrollBarAsNeeded && qq->horizontalScrollBarPolicy() == Qt::ScrollBarAsNeeded; if (bothScrollBarsAuto && contentsSize.width() - qq->verticalScrollBar()->width() <= viewport()->width() && contentsSize.height() - qq->horizontalScrollBar()->height() <= viewport()->height()) { // break the infinite loop described above by setting the range to 0, 0. // QAbstractScrollArea will then hide the scroll bar for us verticalScrollBar()->setRange(0, 0); } else { verticalScrollBar()->setRange(0, contentsSize.height() - viewport()->height()); } } void QCommonListViewBase::scrollContentsBy(int dx, int dy, bool /*scrollElasticBand*/) { dd->scrollContentsBy(isRightToLeft() ? -dx : dx, dy); } int QCommonListViewBase::verticalScrollToValue(int /*index*/, QListView::ScrollHint hint, bool above, bool below, const QRect &area, const QRect &rect) const { int verticalValue = verticalScrollBar()->value(); QRect adjusted = rect.adjusted(-spacing(), -spacing(), spacing(), spacing()); if (hint == QListView::PositionAtTop || above) verticalValue += adjusted.top(); else if (hint == QListView::PositionAtBottom || below) verticalValue += qMin(adjusted.top(), adjusted.bottom() - area.height() + 1); else if (hint == QListView::PositionAtCenter) verticalValue += adjusted.top() - ((area.height() - adjusted.height()) / 2); return verticalValue; } int QCommonListViewBase::horizontalOffset() const { return (isRightToLeft() ? horizontalScrollBar()->maximum() - horizontalScrollBar()->value() : horizontalScrollBar()->value()); } int QCommonListViewBase::horizontalScrollToValue(const int /*index*/, QListView::ScrollHint hint, bool leftOf, bool rightOf, const QRect &area, const QRect &rect) const { int horizontalValue = horizontalScrollBar()->value(); if (isRightToLeft()) { if (hint == QListView::PositionAtCenter) { horizontalValue += ((area.width() - rect.width()) / 2) - rect.left(); } else { if (leftOf) horizontalValue -= rect.left(); else if (rightOf) horizontalValue += qMin(rect.left(), area.width() - rect.right()); } } else { if (hint == QListView::PositionAtCenter) { horizontalValue += rect.left() - ((area.width()- rect.width()) / 2); } else { if (leftOf) horizontalValue += rect.left(); else if (rightOf) horizontalValue += qMin(rect.left(), rect.right() - area.width()); } } return horizontalValue; } /* * ListMode ListView Implementation */ #ifndef QT_NO_DRAGANDDROP QAbstractItemView::DropIndicatorPosition QListModeViewBase::position(const QPoint &pos, const QRect &rect, const QModelIndex &index) const { QAbstractItemView::DropIndicatorPosition r = QAbstractItemView::OnViewport; if (!dd->overwrite) { const int margin = 2; if (pos.x() - rect.left() < margin) { r = QAbstractItemView::AboveItem; // Visually, on the left } else if (rect.right() - pos.x() < margin) { r = QAbstractItemView::BelowItem; // Visually, on the right } else if (rect.contains(pos, true)) { r = QAbstractItemView::OnItem; } } else { QRect touchingRect = rect; touchingRect.adjust(-1, -1, 1, 1); if (touchingRect.contains(pos, false)) { r = QAbstractItemView::OnItem; } } if (r == QAbstractItemView::OnItem && (!(dd->model->flags(index) & Qt::ItemIsDropEnabled))) r = pos.x() < rect.center().x() ? QAbstractItemView::AboveItem : QAbstractItemView::BelowItem; return r; } void QListModeViewBase::dragMoveEvent(QDragMoveEvent *event) { if (qq->dragDropMode() == QAbstractItemView::InternalMove && (event->source() != qq || !(event->possibleActions() & Qt::MoveAction))) return; // ignore by default event->ignore(); // can't use indexAt, doesn't account for spacing. QPoint p = event->pos(); QRect rect(p.x() + horizontalOffset(), p.y() + verticalOffset(), 1, 1); rect.adjust(-dd->spacing(), -dd->spacing(), dd->spacing(), dd->spacing()); const QVector intersectVector = dd->intersectingSet(rect); QModelIndex index = intersectVector.count() > 0 ? intersectVector.last() : QModelIndex(); dd->hover = index; if (!dd->droppingOnItself(event, index) && dd->canDecode(event)) { if (index.isValid() && dd->showDropIndicator) { QRect rect = qq->visualRect(index); dd->dropIndicatorPosition = position(event->pos(), rect, index); // if spacing, should try to draw between items, not just next to item. switch (dd->dropIndicatorPosition) { case QAbstractItemView::AboveItem: if (dd->isIndexDropEnabled(index.parent())) { dd->dropIndicatorRect = QRect(rect.left()-dd->spacing(), rect.top(), 0, rect.height()); event->accept(); } else { dd->dropIndicatorRect = QRect(); } break; case QAbstractItemView::BelowItem: if (dd->isIndexDropEnabled(index.parent())) { dd->dropIndicatorRect = QRect(rect.right()+dd->spacing(), rect.top(), 0, rect.height()); event->accept(); } else { dd->dropIndicatorRect = QRect(); } break; case QAbstractItemView::OnItem: if (dd->isIndexDropEnabled(index)) { dd->dropIndicatorRect = rect; event->accept(); } else { dd->dropIndicatorRect = QRect(); } break; case QAbstractItemView::OnViewport: dd->dropIndicatorRect = QRect(); if (dd->isIndexDropEnabled(qq->rootIndex())) { event->accept(); // allow dropping in empty areas } break; } } else { dd->dropIndicatorRect = QRect(); dd->dropIndicatorPosition = QAbstractItemView::OnViewport; if (dd->isIndexDropEnabled(qq->rootIndex())) { event->accept(); // allow dropping in empty areas } } dd->viewport->update(); } // can decode if (dd->shouldAutoScroll(event->pos())) qq->startAutoScroll(); } /*! If the event hasn't already been accepted, determines the index to drop on. if (row == -1 && col == -1) // append to this drop index else // place at row, col in drop index If it returns true a drop can be done, and dropRow, dropCol and dropIndex reflects the position of the drop. \internal */ bool QListModeViewBase::dropOn(QDropEvent *event, int *dropRow, int *dropCol, QModelIndex *dropIndex) { if (event->isAccepted()) return false; QModelIndex index; if (dd->viewport->rect().contains(event->pos())) { // can't use indexAt, doesn't account for spacing. QPoint p = event->pos(); QRect rect(p.x() + horizontalOffset(), p.y() + verticalOffset(), 1, 1); rect.adjust(-dd->spacing(), -dd->spacing(), dd->spacing(), dd->spacing()); const QVector intersectVector = dd->intersectingSet(rect); index = intersectVector.count() > 0 ? intersectVector.last() : QModelIndex(); if (!index.isValid()) index = dd->root; } // If we are allowed to do the drop if (dd->model->supportedDropActions() & event->dropAction()) { int row = -1; int col = -1; if (index != dd->root) { dd->dropIndicatorPosition = position(event->pos(), qq->visualRect(index), index); switch (dd->dropIndicatorPosition) { case QAbstractItemView::AboveItem: row = index.row(); col = index.column(); index = index.parent(); break; case QAbstractItemView::BelowItem: row = index.row() + 1; col = index.column(); index = index.parent(); break; case QAbstractItemView::OnItem: case QAbstractItemView::OnViewport: break; } } else { dd->dropIndicatorPosition = QAbstractItemView::OnViewport; } *dropIndex = index; *dropRow = row; *dropCol = col; if (!dd->droppingOnItself(event, index)) return true; } return false; } #endif //QT_NO_DRAGANDDROP void QListModeViewBase::updateVerticalScrollBar(const QSize &step) { if (verticalScrollMode() == QAbstractItemView::ScrollPerItem && ((flow() == QListView::TopToBottom && !isWrapping()) || (flow() == QListView::LeftToRight && isWrapping()))) { const int steps = (flow() == QListView::TopToBottom ? scrollValueMap : segmentPositions).count() - 1; if (steps > 0) { const int pageSteps = perItemScrollingPageSteps(viewport()->height(), contentsSize.height(), isWrapping()); verticalScrollBar()->setSingleStep(1); verticalScrollBar()->setPageStep(pageSteps); verticalScrollBar()->setRange(0, steps - pageSteps); } else { verticalScrollBar()->setRange(0, 0); } // } else if (vertical && d->isWrapping() && d->movement == Static) { // ### wrapped scrolling in flow direction } else { QCommonListViewBase::updateVerticalScrollBar(step); } } void QListModeViewBase::updateHorizontalScrollBar(const QSize &step) { if (horizontalScrollMode() == QAbstractItemView::ScrollPerItem && ((flow() == QListView::TopToBottom && isWrapping()) || (flow() == QListView::LeftToRight && !isWrapping()))) { int steps = (flow() == QListView::TopToBottom ? segmentPositions : scrollValueMap).count() - 1; if (steps > 0) { const int pageSteps = perItemScrollingPageSteps(viewport()->width(), contentsSize.width(), isWrapping()); horizontalScrollBar()->setSingleStep(1); horizontalScrollBar()->setPageStep(pageSteps); horizontalScrollBar()->setRange(0, steps - pageSteps); } else { horizontalScrollBar()->setRange(0, 0); } } else { QCommonListViewBase::updateHorizontalScrollBar(step); } } int QListModeViewBase::verticalScrollToValue(int index, QListView::ScrollHint hint, bool above, bool below, const QRect &area, const QRect &rect) const { if (verticalScrollMode() == QAbstractItemView::ScrollPerItem) { int value; if (scrollValueMap.isEmpty()) { value = 0; } else { int scrollBarValue = verticalScrollBar()->value(); int numHidden = 0; for (int i = 0; i < flowPositions.count() - 1 && i <= scrollBarValue; ++i) if (isHidden(i)) ++numHidden; value = qBound(0, scrollValueMap.at(verticalScrollBar()->value()) - numHidden, flowPositions.count() - 1); } if (above) hint = QListView::PositionAtTop; else if (below) hint = QListView::PositionAtBottom; if (hint == QListView::EnsureVisible) return value; return perItemScrollToValue(index, value, area.height(), hint, Qt::Vertical, isWrapping(), rect.height()); } return QCommonListViewBase::verticalScrollToValue(index, hint, above, below, area, rect); } int QListModeViewBase::horizontalOffset() const { if (horizontalScrollMode() == QAbstractItemView::ScrollPerItem) { if (isWrapping()) { if (flow() == QListView::TopToBottom && !segmentPositions.isEmpty()) { const int max = segmentPositions.count() - 1; int currentValue = qBound(0, horizontalScrollBar()->value(), max); int position = segmentPositions.at(currentValue); int maximumValue = qBound(0, horizontalScrollBar()->maximum(), max); int maximum = segmentPositions.at(maximumValue); return (isRightToLeft() ? maximum - position : position); } } else if (flow() == QListView::LeftToRight && !flowPositions.isEmpty()) { int position = flowPositions.at(scrollValueMap.at(horizontalScrollBar()->value())); int maximum = flowPositions.at(scrollValueMap.at(horizontalScrollBar()->maximum())); return (isRightToLeft() ? maximum - position : position); } } return QCommonListViewBase::horizontalOffset(); } int QListModeViewBase::verticalOffset() const { if (verticalScrollMode() == QAbstractItemView::ScrollPerItem) { if (isWrapping()) { if (flow() == QListView::LeftToRight && !segmentPositions.isEmpty()) { int value = verticalScrollBar()->value(); if (value >= segmentPositions.count()) return 0; return segmentPositions.at(value) - spacing(); } } else if (flow() == QListView::TopToBottom && !flowPositions.isEmpty()) { int value = verticalScrollBar()->value(); if (value > scrollValueMap.count()) return 0; return flowPositions.at(scrollValueMap.at(value)) - spacing(); } } return QCommonListViewBase::verticalOffset(); } int QListModeViewBase::horizontalScrollToValue(int index, QListView::ScrollHint hint, bool leftOf, bool rightOf, const QRect &area, const QRect &rect) const { if (horizontalScrollMode() != QAbstractItemView::ScrollPerItem) return QCommonListViewBase::horizontalScrollToValue(index, hint, leftOf, rightOf, area, rect); int value; if (scrollValueMap.isEmpty()) value = 0; else value = qBound(0, scrollValueMap.at(horizontalScrollBar()->value()), flowPositions.count() - 1); if (leftOf) hint = QListView::PositionAtTop; else if (rightOf) hint = QListView::PositionAtBottom; if (hint == QListView::EnsureVisible) return value; return perItemScrollToValue(index, value, area.width(), hint, Qt::Horizontal, isWrapping(), rect.width()); } void QListModeViewBase::scrollContentsBy(int dx, int dy, bool scrollElasticBand) { // ### reorder this logic const int verticalValue = verticalScrollBar()->value(); const int horizontalValue = horizontalScrollBar()->value(); const bool vertical = (verticalScrollMode() == QAbstractItemView::ScrollPerItem); const bool horizontal = (horizontalScrollMode() == QAbstractItemView::ScrollPerItem); if (isWrapping()) { if (segmentPositions.isEmpty()) return; const int max = segmentPositions.count() - 1; if (horizontal && flow() == QListView::TopToBottom && dx != 0) { int currentValue = qBound(0, horizontalValue, max); int previousValue = qBound(0, currentValue + dx, max); int currentCoordinate = segmentPositions.at(currentValue) - spacing(); int previousCoordinate = segmentPositions.at(previousValue) - spacing(); dx = previousCoordinate - currentCoordinate; } else if (vertical && flow() == QListView::LeftToRight && dy != 0) { int currentValue = qBound(0, verticalValue, max); int previousValue = qBound(0, currentValue + dy, max); int currentCoordinate = segmentPositions.at(currentValue) - spacing(); int previousCoordinate = segmentPositions.at(previousValue) - spacing(); dy = previousCoordinate - currentCoordinate; } } else { if (flowPositions.isEmpty()) return; const int max = scrollValueMap.count() - 1; if (vertical && flow() == QListView::TopToBottom && dy != 0) { int currentValue = qBound(0, verticalValue, max); int previousValue = qBound(0, currentValue + dy, max); int currentCoordinate = flowPositions.at(scrollValueMap.at(currentValue)); int previousCoordinate = flowPositions.at(scrollValueMap.at(previousValue)); dy = previousCoordinate - currentCoordinate; } else if (horizontal && flow() == QListView::LeftToRight && dx != 0) { int currentValue = qBound(0, horizontalValue, max); int previousValue = qBound(0, currentValue + dx, max); int currentCoordinate = flowPositions.at(scrollValueMap.at(currentValue)); int previousCoordinate = flowPositions.at(scrollValueMap.at(previousValue)); dx = previousCoordinate - currentCoordinate; } } QCommonListViewBase::scrollContentsBy(dx, dy, scrollElasticBand); } bool QListModeViewBase::doBatchedItemLayout(const QListViewLayoutInfo &info, int max) { doStaticLayout(info); if (batchStartRow > max) { // stop items layout flowPositions.resize(flowPositions.count()); segmentPositions.resize(segmentPositions.count()); segmentStartRows.resize(segmentStartRows.count()); return true; // done } return false; // not done } QListViewItem QListModeViewBase::indexToListViewItem(const QModelIndex &index) const { if (flowPositions.isEmpty() || segmentPositions.isEmpty() || index.row() >= flowPositions.count()) return QListViewItem(); const int segment = qBinarySearch(segmentStartRows, index.row(), 0, segmentStartRows.count() - 1); QStyleOptionViewItemV4 options = viewOptions(); options.rect.setSize(contentsSize); QSize size = (uniformItemSizes() && cachedItemSize().isValid()) ? cachedItemSize() : itemSize(options, index); QPoint pos; if (flow() == QListView::LeftToRight) { pos.setX(flowPositions.at(index.row())); pos.setY(segmentPositions.at(segment)); } else { // TopToBottom pos.setY(flowPositions.at(index.row())); pos.setX(segmentPositions.at(segment)); if (isWrapping()) { // make the items as wide as the segment int right = (segment + 1 >= segmentPositions.count() ? contentsSize.width() : segmentPositions.at(segment + 1)); size.setWidth(right - pos.x()); } else { // make the items as wide as the viewport size.setWidth(qMax(size.width(), viewport()->width() - 2 * spacing())); } } return QListViewItem(QRect(pos, size), index.row()); } QPoint QListModeViewBase::initStaticLayout(const QListViewLayoutInfo &info) { int x, y; if (info.first == 0) { flowPositions.clear(); segmentPositions.clear(); segmentStartRows.clear(); segmentExtents.clear(); scrollValueMap.clear(); x = info.bounds.left() + info.spacing; y = info.bounds.top() + info.spacing; segmentPositions.append(info.flow == QListView::LeftToRight ? y : x); segmentStartRows.append(0); } else if (info.wrap) { if (info.flow == QListView::LeftToRight) { x = batchSavedPosition; y = segmentPositions.last(); } else { // flow == QListView::TopToBottom x = segmentPositions.last(); y = batchSavedPosition; } } else { // not first and not wrap if (info.flow == QListView::LeftToRight) { x = batchSavedPosition; y = info.bounds.top() + info.spacing; } else { // flow == QListView::TopToBottom x = info.bounds.left() + info.spacing; y = batchSavedPosition; } } return QPoint(x, y); } /*! \internal */ void QListModeViewBase::doStaticLayout(const QListViewLayoutInfo &info) { const bool useItemSize = !info.grid.isValid(); const QPoint topLeft = initStaticLayout(info); QStyleOptionViewItemV4 option = viewOptions(); option.rect = info.bounds; option.rect.adjust(info.spacing, info.spacing, -info.spacing, -info.spacing); // The static layout data structures are as follows: // One vector contains the coordinate in the direction of layout flow. // Another vector contains the coordinates of the segments. // A third vector contains the index (model row) of the first item // of each segment. int segStartPosition; int segEndPosition; int deltaFlowPosition; int deltaSegPosition; int deltaSegHint; int flowPosition; int segPosition; if (info.flow == QListView::LeftToRight) { segStartPosition = info.bounds.left(); segEndPosition = info.bounds.width(); flowPosition = topLeft.x(); segPosition = topLeft.y(); deltaFlowPosition = info.grid.width(); // dx deltaSegPosition = useItemSize ? batchSavedDeltaSeg : info.grid.height(); // dy deltaSegHint = info.grid.height(); } else { // flow == QListView::TopToBottom segStartPosition = info.bounds.top(); segEndPosition = info.bounds.height(); flowPosition = topLeft.y(); segPosition = topLeft.x(); deltaFlowPosition = info.grid.height(); // dy deltaSegPosition = useItemSize ? batchSavedDeltaSeg : info.grid.width(); // dx deltaSegHint = info.grid.width(); } for (int row = info.first; row <= info.last; ++row) { if (isHidden(row)) { // ### flowPositions.append(flowPosition); } else { // if we are not using a grid, we need to find the deltas if (useItemSize) { QSize hint = itemSize(option, modelIndex(row)); if (info.flow == QListView::LeftToRight) { deltaFlowPosition = hint.width() + info.spacing; deltaSegHint = hint.height() + info.spacing; } else { // TopToBottom deltaFlowPosition = hint.height() + info.spacing; deltaSegHint = hint.width() + info.spacing; } } // create new segment if (info.wrap && (flowPosition + deltaFlowPosition >= segEndPosition)) { segmentExtents.append(flowPosition); flowPosition = info.spacing + segStartPosition; segPosition += deltaSegPosition; if (info.wrap) segPosition += info.spacing; segmentPositions.append(segPosition); segmentStartRows.append(row); deltaSegPosition = 0; } // save the flow position of this item scrollValueMap.append(flowPositions.count()); flowPositions.append(flowPosition); // prepare for the next item deltaSegPosition = qMax(deltaSegHint, deltaSegPosition); flowPosition += info.spacing + deltaFlowPosition; } } // used when laying out next batch batchSavedPosition = flowPosition; batchSavedDeltaSeg = deltaSegPosition; batchStartRow = info.last + 1; if (info.last == info.max) flowPosition -= info.spacing; // remove extra spacing // set the contents size QRect rect = info.bounds; if (info.flow == QListView::LeftToRight) { rect.setRight(segmentPositions.count() == 1 ? flowPosition : info.bounds.right()); rect.setBottom(segPosition + deltaSegPosition); } else { // TopToBottom rect.setRight(segPosition + deltaSegPosition); rect.setBottom(segmentPositions.count() == 1 ? flowPosition : info.bounds.bottom()); } contentsSize = QSize(rect.right(), rect.bottom()); // if it is the last batch, save the end of the segments if (info.last == info.max) { segmentExtents.append(flowPosition); scrollValueMap.append(flowPositions.count()); flowPositions.append(flowPosition); segmentPositions.append(info.wrap ? segPosition + deltaSegPosition : INT_MAX); } // if the new items are visble, update the viewport QRect changedRect(topLeft, rect.bottomRight()); if (clipRect().intersects(changedRect)) viewport()->update(); } /*! \internal Finds the set of items intersecting with \a area. In this function, itemsize is counted from topleft to the start of the next item. */ QVector QListModeViewBase::intersectingSet(const QRect &area) const { QVector ret; int segStartPosition; int segEndPosition; int flowStartPosition; int flowEndPosition; if (flow() == QListView::LeftToRight) { segStartPosition = area.top(); segEndPosition = area.bottom(); flowStartPosition = area.left(); flowEndPosition = area.right(); } else { segStartPosition = area.left(); segEndPosition = area.right(); flowStartPosition = area.top(); flowEndPosition = area.bottom(); } if (segmentPositions.count() < 2 || flowPositions.isEmpty()) return ret; // the last segment position is actually the edge of the last segment const int segLast = segmentPositions.count() - 2; int seg = qBinarySearch(segmentPositions, segStartPosition, 0, segLast + 1); for (; seg <= segLast && segmentPositions.at(seg) <= segEndPosition; ++seg) { int first = segmentStartRows.at(seg); int last = (seg < segLast ? segmentStartRows.at(seg + 1) : batchStartRow) - 1; if (segmentExtents.at(seg) < flowStartPosition) continue; int row = qBinarySearch(flowPositions, flowStartPosition, first, last); for (; row <= last && flowPositions.at(row) <= flowEndPosition; ++row) { if (isHidden(row)) continue; QModelIndex index = modelIndex(row); if (index.isValid()) ret += index; #if 0 // for debugging else qWarning("intersectingSet: row %d was invalid", row); #endif } } return ret; } void QListModeViewBase::dataChanged(const QModelIndex &, const QModelIndex &) { dd->doDelayedItemsLayout(); } QRect QListModeViewBase::mapToViewport(const QRect &rect) const { if (isWrapping()) return rect; // If the listview is in "listbox-mode", the items are as wide as the view. // But we don't shrink the items. QRect result = rect; if (flow() == QListView::TopToBottom) { result.setLeft(spacing()); result.setWidth(qMax(rect.width(), qMax(contentsSize.width(), viewport()->width()) - 2 * spacing())); } else { // LeftToRight result.setTop(spacing()); result.setHeight(qMax(rect.height(), qMax(contentsSize.height(), viewport()->height()) - 2 * spacing())); } return result; } int QListModeViewBase::perItemScrollingPageSteps(int length, int bounds, bool wrap) const { QVector positions; if (wrap) positions = segmentPositions; else if (!flowPositions.isEmpty()) { positions.reserve(scrollValueMap.size()); foreach (int itemShown, scrollValueMap) positions.append(flowPositions.at(itemShown)); } if (positions.isEmpty() || bounds <= length) return positions.count(); if (uniformItemSizes()) { for (int i = 1; i < positions.count(); ++i) if (positions.at(i) > 0) return length / positions.at(i); return 0; // all items had height 0 } int pageSteps = 0; int steps = positions.count() - 1; int max = qMax(length, bounds); int min = qMin(length, bounds); int pos = min - (max - positions.last()); while (pos >= 0 && steps > 0) { pos -= (positions.at(steps) - positions.at(steps - 1)); if (pos >= 0) //this item should be visible ++pageSteps; --steps; } // at this point we know that positions has at least one entry return qMax(pageSteps, 1); } int QListModeViewBase::perItemScrollToValue(int index, int scrollValue, int viewportSize, QAbstractItemView::ScrollHint hint, Qt::Orientation orientation, bool wrap, int itemExtent) const { if (index < 0) return scrollValue; QVector visibleFlowPositions; visibleFlowPositions.reserve(flowPositions.count() - 1); for (int i = 0; i < flowPositions.count() - 1; i++) { // flowPositions count is +1 larger than actual row count if (!isHidden(i)) visibleFlowPositions.append(flowPositions.at(i)); } if (!wrap) { int topIndex = index; const int bottomIndex = topIndex; const int bottomCoordinate = visibleFlowPositions.at(index); while (topIndex > 0 && (bottomCoordinate - visibleFlowPositions.at(topIndex - 1) + itemExtent) <= (viewportSize)) { topIndex--; } const int itemCount = bottomIndex - topIndex + 1; switch (hint) { case QAbstractItemView::PositionAtTop: return index; case QAbstractItemView::PositionAtBottom: return index - itemCount + 1; case QAbstractItemView::PositionAtCenter: return index - (itemCount / 2); default: break; } } else { // wrapping Qt::Orientation flowOrientation = (flow() == QListView::LeftToRight ? Qt::Horizontal : Qt::Vertical); if (flowOrientation == orientation) { // scrolling in the "flow" direction // ### wrapped scrolling in the flow direction return visibleFlowPositions.at(index); // ### always pixel based for now } else if (!segmentStartRows.isEmpty()) { // we are scrolling in the "segment" direction int segment = qBinarySearch(segmentStartRows, index, 0, segmentStartRows.count() - 1); int leftSegment = segment; const int rightSegment = leftSegment; const int bottomCoordinate = segmentPositions.at(segment); while (leftSegment > scrollValue && (bottomCoordinate - segmentPositions.at(leftSegment-1) + itemExtent) <= (viewportSize)) { leftSegment--; } const int segmentCount = rightSegment - leftSegment + 1; switch (hint) { case QAbstractItemView::PositionAtTop: return segment; case QAbstractItemView::PositionAtBottom: return segment - segmentCount + 1; case QAbstractItemView::PositionAtCenter: return segment - (segmentCount / 2); default: break; } } } return scrollValue; } void QListModeViewBase::clear() { flowPositions.clear(); segmentPositions.clear(); segmentStartRows.clear(); segmentExtents.clear(); batchSavedPosition = 0; batchStartRow = 0; batchSavedDeltaSeg = 0; } /* * IconMode ListView Implementation */ void QIconModeViewBase::setPositionForIndex(const QPoint &position, const QModelIndex &index) { if (index.row() >= items.count()) return; const QSize oldContents = contentsSize; qq->update(index); // update old position moveItem(index.row(), position); qq->update(index); // update new position if (contentsSize != oldContents) dd->viewUpdateGeometries(); // update the scroll bars } void QIconModeViewBase::appendHiddenRow(int row) { if (row >= 0 && row < items.count()) //remove item tree.removeLeaf(items.at(row).rect(), row); QCommonListViewBase::appendHiddenRow(row); } void QIconModeViewBase::removeHiddenRow(int row) { QCommonListViewBase::removeHiddenRow(row); if (row >= 0 && row < items.count()) //insert item tree.insertLeaf(items.at(row).rect(), row); } #ifndef QT_NO_DRAGANDDROP bool QIconModeViewBase::filterStartDrag(Qt::DropActions supportedActions) { // This function does the same thing as in QAbstractItemView::startDrag(), // plus adding viewitems to the draggedItems list. // We need these items to draw the drag items QModelIndexList indexes = dd->selectionModel->selectedIndexes(); if (indexes.count() > 0 ) { if (viewport()->acceptDrops()) { QModelIndexList::ConstIterator it = indexes.constBegin(); for (; it != indexes.constEnd(); ++it) if (dd->model->flags(*it) & Qt::ItemIsDragEnabled && (*it).column() == dd->column) draggedItems.push_back(*it); } QRect rect; QPixmap pixmap = dd->renderToPixmap(indexes, &rect); rect.adjust(horizontalOffset(), verticalOffset(), 0, 0); QDrag *drag = new QDrag(qq); drag->setPixmap(pixmap); drag->setHotSpot(dd->pressedPosition - rect.topLeft()); drag->setMimeData(dd->model->mimeData(indexes)); Qt::DropAction action = drag->exec(supportedActions, Qt::CopyAction); draggedItems.clear(); if (action == Qt::MoveAction) dd->clearOrRemove(); } return true; } bool QIconModeViewBase::filterDropEvent(QDropEvent *e) { if (e->source() != qq) return false; const QSize contents = contentsSize; QPoint offset(horizontalOffset(), verticalOffset()); QPoint end = e->pos() + offset; if (qq->acceptDrops()) { const Qt::ItemFlags dropableFlags = Qt::ItemIsDropEnabled|Qt::ItemIsEnabled; const QVector &dropIndices = intersectingSet(QRect(end, QSize(1, 1))); foreach (const QModelIndex &index, dropIndices) if ((index.flags() & dropableFlags) == dropableFlags) return false; } QPoint start = dd->pressedPosition; QPoint delta = (dd->movement == QListView::Snap ? snapToGrid(end) - snapToGrid(start) : end - start); QList indexes = dd->selectionModel->selectedIndexes(); for (int i = 0; i < indexes.count(); ++i) { QModelIndex index = indexes.at(i); QRect rect = dd->rectForIndex(index); viewport()->update(dd->mapToViewport(rect, false)); QPoint dest = rect.topLeft() + delta; if (qq->isRightToLeft()) dest.setX(dd->flipX(dest.x()) - rect.width()); moveItem(index.row(), dest); qq->update(index); } dd->stopAutoScroll(); draggedItems.clear(); dd->emitIndexesMoved(indexes); e->accept(); // we have handled the event // if the size has not grown, we need to check if it has shrinked if (contentsSize != contents) { if ((contentsSize.width() <= contents.width() || contentsSize.height() <= contents.height())) { updateContentsSize(); } dd->viewUpdateGeometries(); } return true; } bool QIconModeViewBase::filterDragLeaveEvent(QDragLeaveEvent *e) { viewport()->update(draggedItemsRect()); // erase the area draggedItemsPos = QPoint(-1, -1); // don't draw the dragged items return QCommonListViewBase::filterDragLeaveEvent(e); } bool QIconModeViewBase::filterDragMoveEvent(QDragMoveEvent *e) { if (e->source() != qq || !dd->canDecode(e)) return false; // ignore by default e->ignore(); // get old dragged items rect QRect itemsRect = this->itemsRect(draggedItems); viewport()->update(itemsRect.translated(draggedItemsDelta())); // update position draggedItemsPos = e->pos(); // get new items rect viewport()->update(itemsRect.translated(draggedItemsDelta())); // set the item under the cursor to current QModelIndex index; if (movement() == QListView::Snap) { QRect rect(snapToGrid(e->pos() + offset()), gridSize()); const QVector intersectVector = intersectingSet(rect); index = intersectVector.count() > 0 ? intersectVector.last() : QModelIndex(); } else { index = qq->indexAt(e->pos()); } // check if we allow drops here if (draggedItems.contains(index)) e->accept(); // allow changing item position else if (dd->model->flags(index) & Qt::ItemIsDropEnabled) e->accept(); // allow dropping on dropenabled items else if (!index.isValid()) e->accept(); // allow dropping in empty areas // the event was treated. do autoscrolling if (dd->shouldAutoScroll(e->pos())) dd->startAutoScroll(); return true; } #endif // QT_NO_DRAGANDDROP void QIconModeViewBase::setRowCount(int rowCount) { tree.create(qMax(rowCount - hiddenCount(), 0)); } void QIconModeViewBase::scrollContentsBy(int dx, int dy, bool scrollElasticBand) { if (scrollElasticBand) dd->scrollElasticBandBy(isRightToLeft() ? -dx : dx, dy); QCommonListViewBase::scrollContentsBy(dx, dy, scrollElasticBand); if (!draggedItems.isEmpty()) viewport()->update(draggedItemsRect().translated(dx, dy)); } void QIconModeViewBase::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight) { if (column() >= topLeft.column() && column() <= bottomRight.column()) { QStyleOptionViewItemV4 option = viewOptions(); int bottom = qMin(items.count(), bottomRight.row() + 1); for (int row = topLeft.row(); row < bottom; ++row) items[row].resize(itemSize(option, modelIndex(row))); } } bool QIconModeViewBase::doBatchedItemLayout(const QListViewLayoutInfo &info, int max) { if (info.last >= items.count()) { //first we create the items QStyleOptionViewItemV4 option = viewOptions(); for (int row = items.count(); row <= info.last; ++row) { QSize size = itemSize(option, modelIndex(row)); QListViewItem item(QRect(0, 0, size.width(), size.height()), row); // default pos items.append(item); } doDynamicLayout(info); } return (batchStartRow > max); // done } QListViewItem QIconModeViewBase::indexToListViewItem(const QModelIndex &index) const { if (index.isValid() && index.row() < items.count()) return items.at(index.row()); return QListViewItem(); } void QIconModeViewBase::initBspTree(const QSize &contents) { // remove all items from the tree int leafCount = tree.leafCount(); for (int l = 0; l < leafCount; ++l) tree.leaf(l).clear(); // we have to get the bounding rect of the items before we can initialize the tree QBspTree::Node::Type type = QBspTree::Node::Both; // 2D // simple heuristics to get better bsp if (contents.height() / contents.width() >= 3) type = QBspTree::Node::HorizontalPlane; else if (contents.width() / contents.height() >= 3) type = QBspTree::Node::VerticalPlane; // build tree for the bounding rect (not just the contents rect) tree.init(QRect(0, 0, contents.width(), contents.height()), type); } QPoint QIconModeViewBase::initDynamicLayout(const QListViewLayoutInfo &info) { int x, y; if (info.first == 0) { x = info.bounds.x() + info.spacing; y = info.bounds.y() + info.spacing; items.reserve(rowCount() - hiddenCount()); } else { int idx = info.first - 1; while (idx > 0 && !items.at(idx).isValid()) --idx; const QListViewItem &item = items.at(idx); x = item.x; y = item.y; if (info.flow == QListView::LeftToRight) x += (info.grid.isValid() ? info.grid.width() : item.w) + info.spacing; else y += (info.grid.isValid() ? info.grid.height() : item.h) + info.spacing; } return QPoint(x, y); } /*! \internal */ void QIconModeViewBase::doDynamicLayout(const QListViewLayoutInfo &info) { const bool useItemSize = !info.grid.isValid(); const QPoint topLeft = initDynamicLayout(info); int segStartPosition; int segEndPosition; int deltaFlowPosition; int deltaSegPosition; int deltaSegHint; int flowPosition; int segPosition; if (info.flow == QListView::LeftToRight) { segStartPosition = info.bounds.left() + info.spacing; segEndPosition = info.bounds.right(); deltaFlowPosition = info.grid.width(); // dx deltaSegPosition = (useItemSize ? batchSavedDeltaSeg : info.grid.height()); // dy deltaSegHint = info.grid.height(); flowPosition = topLeft.x(); segPosition = topLeft.y(); } else { // flow == QListView::TopToBottom segStartPosition = info.bounds.top() + info.spacing; segEndPosition = info.bounds.bottom(); deltaFlowPosition = info.grid.height(); // dy deltaSegPosition = (useItemSize ? batchSavedDeltaSeg : info.grid.width()); // dx deltaSegHint = info.grid.width(); flowPosition = topLeft.y(); segPosition = topLeft.x(); } if (moved.count() != items.count()) moved.resize(items.count()); QRect rect(QPoint(), topLeft); QListViewItem *item = 0; for (int row = info.first; row <= info.last; ++row) { item = &items[row]; if (isHidden(row)) { item->invalidate(); } else { // if we are not using a grid, we need to find the deltas if (useItemSize) { if (info.flow == QListView::LeftToRight) deltaFlowPosition = item->w + info.spacing; else deltaFlowPosition = item->h + info.spacing; } else { item->w = qMin(info.grid.width(), item->w); item->h = qMin(info.grid.height(), item->h); } // create new segment if (info.wrap && flowPosition + deltaFlowPosition > segEndPosition && flowPosition > segStartPosition) { flowPosition = segStartPosition; segPosition += deltaSegPosition; if (useItemSize) deltaSegPosition = 0; } // We must delay calculation of the seg adjustment, as this item // may have caused a wrap to occur if (useItemSize) { if (info.flow == QListView::LeftToRight) deltaSegHint = item->h + info.spacing; else deltaSegHint = item->w + info.spacing; deltaSegPosition = qMax(deltaSegPosition, deltaSegHint); } // set the position of the item // ### idealy we should have some sort of alignment hint for the item // ### (normally that would be a point between the icon and the text) if (!moved.testBit(row)) { if (info.flow == QListView::LeftToRight) { if (useItemSize) { item->x = flowPosition; item->y = segPosition; } else { // use grid item->x = flowPosition + ((deltaFlowPosition - item->w) / 2); item->y = segPosition; } } else { // TopToBottom if (useItemSize) { item->y = flowPosition; item->x = segPosition; } else { // use grid item->y = flowPosition + ((deltaFlowPosition - item->h) / 2); item->x = segPosition; } } } // let the contents contain the new item if (useItemSize) rect |= item->rect(); else if (info.flow == QListView::LeftToRight) rect |= QRect(flowPosition, segPosition, deltaFlowPosition, deltaSegPosition); else // flow == TopToBottom rect |= QRect(segPosition, flowPosition, deltaSegPosition, deltaFlowPosition); // prepare for next item flowPosition += deltaFlowPosition; // current position + item width + gap } } batchSavedDeltaSeg = deltaSegPosition; batchStartRow = info.last + 1; bool done = (info.last >= rowCount() - 1); // resize the content area if (done || !info.bounds.contains(item->rect())) { contentsSize = rect.size(); if (info.flow == QListView::LeftToRight) contentsSize.rheight() += info.spacing; else contentsSize.rwidth() += info.spacing; } if (rect.size().isEmpty()) return; // resize tree int insertFrom = info.first; if (done || info.first == 0) { initBspTree(rect.size()); insertFrom = 0; } // insert items in tree for (int row = insertFrom; row <= info.last; ++row) tree.insertLeaf(items.at(row).rect(), row); // if the new items are visble, update the viewport QRect changedRect(topLeft, rect.bottomRight()); if (clipRect().intersects(changedRect)) viewport()->update(); } QVector QIconModeViewBase::intersectingSet(const QRect &area) const { QIconModeViewBase *that = const_cast(this); QBspTree::Data data(static_cast(that)); QVector res; that->interSectingVector = &res; that->tree.climbTree(area, &QIconModeViewBase::addLeaf, data); that->interSectingVector = 0; return res; } QRect QIconModeViewBase::itemsRect(const QVector &indexes) const { QVector::const_iterator it = indexes.begin(); QListViewItem item = indexToListViewItem(*it); QRect rect(item.x, item.y, item.w, item.h); for (; it != indexes.end(); ++it) { item = indexToListViewItem(*it); rect |= viewItemRect(item); } return rect; } int QIconModeViewBase::itemIndex(const QListViewItem &item) const { if (!item.isValid()) return -1; int i = item.indexHint; if (i < items.count()) { if (items.at(i) == item) return i; } else { i = items.count() - 1; } int j = i; int c = items.count(); bool a = true; bool b = true; while (a || b) { if (a) { if (items.at(i) == item) { items.at(i).indexHint = i; return i; } a = ++i < c; } if (b) { if (items.at(j) == item) { items.at(j).indexHint = j; return j; } b = --j > -1; } } return -1; } void QIconModeViewBase::addLeaf(QVector &leaf, const QRect &area, uint visited, QBspTree::Data data) { QListViewItem *vi; QIconModeViewBase *_this = static_cast(data.ptr); for (int i = 0; i < leaf.count(); ++i) { int idx = leaf.at(i); if (idx < 0 || idx >= _this->items.count()) continue; vi = &_this->items[idx]; Q_ASSERT(vi); if (vi->isValid() && vi->rect().intersects(area) && vi->visited != visited) { QModelIndex index = _this->dd->listViewItemToIndex(*vi); Q_ASSERT(index.isValid()); _this->interSectingVector->append(index); vi->visited = visited; } } } void QIconModeViewBase::moveItem(int index, const QPoint &dest) { // does not impact on the bintree itself or the contents rect QListViewItem *item = &items[index]; QRect rect = item->rect(); // move the item without removing it from the tree tree.removeLeaf(rect, index); item->move(dest); tree.insertLeaf(QRect(dest, rect.size()), index); // resize the contents area contentsSize = (QRect(QPoint(0, 0), contentsSize)|QRect(dest, rect.size())).size(); // mark the item as moved if (moved.count() != items.count()) moved.resize(items.count()); moved.setBit(index, true); } QPoint QIconModeViewBase::snapToGrid(const QPoint &pos) const { int x = pos.x() - (pos.x() % gridSize().width()); int y = pos.y() - (pos.y() % gridSize().height()); return QPoint(x, y); } QPoint QIconModeViewBase::draggedItemsDelta() const { if (movement() == QListView::Snap) { QPoint snapdelta = QPoint((offset().x() % gridSize().width()), (offset().y() % gridSize().height())); return snapToGrid(draggedItemsPos + snapdelta) - snapToGrid(pressedPosition()) - snapdelta; } return draggedItemsPos - pressedPosition(); } QRect QIconModeViewBase::draggedItemsRect() const { QRect rect = itemsRect(draggedItems); rect.translate(draggedItemsDelta()); return rect; } void QListViewPrivate::scrollElasticBandBy(int dx, int dy) { if (dx > 0) // right elasticBand.moveRight(elasticBand.right() + dx); else if (dx < 0) // left elasticBand.moveLeft(elasticBand.left() - dx); if (dy > 0) // down elasticBand.moveBottom(elasticBand.bottom() + dy); else if (dy < 0) // up elasticBand.moveTop(elasticBand.top() - dy); } void QIconModeViewBase::clear() { tree.destroy(); items.clear(); moved.clear(); batchStartRow = 0; batchSavedDeltaSeg = 0; } void QIconModeViewBase::updateContentsSize() { QRect bounding; for (int i = 0; i < items.count(); ++i) bounding |= items.at(i).rect(); contentsSize = bounding.size(); } /*! \reimp */ void QListView::currentChanged(const QModelIndex ¤t, const QModelIndex &previous) { #ifndef QT_NO_ACCESSIBILITY if (QAccessible::isActive()) { if (current.isValid()) { int entry = visualIndex(current) + 1; #ifdef Q_WS_X11 QAccessible::updateAccessibility(this, entry, QAccessible::Focus); #else QAccessible::updateAccessibility(viewport(), entry, QAccessible::Focus); #endif } } #endif QAbstractItemView::currentChanged(current, previous); } /*! \reimp */ void QListView::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected) { #ifndef QT_NO_ACCESSIBILITY if (QAccessible::isActive()) { // ### does not work properly for selection ranges. QModelIndex sel = selected.indexes().value(0); if (sel.isValid()) { int entry = visualIndex(sel) + 1; #ifdef Q_WS_X11 QAccessible::updateAccessibility(this, entry, QAccessible::Selection); #else QAccessible::updateAccessibility(viewport(), entry, QAccessible::Selection); #endif } QModelIndex desel = deselected.indexes().value(0); if (desel.isValid()) { int entry = visualIndex(desel) + 1; #ifdef Q_WS_X11 QAccessible::updateAccessibility(this, entry, QAccessible::SelectionRemove); #else QAccessible::updateAccessibility(viewport(), entry, QAccessible::SelectionRemove); #endif } } #endif QAbstractItemView::selectionChanged(selected, deselected); } int QListView::visualIndex(const QModelIndex &index) const { Q_D(const QListView); d->executePostedLayout(); QListViewItem itm = d->indexToListViewItem(index); int visualIndex = d->commonListView->itemIndex(itm); for (int row = 0; row <= index.row() && visualIndex >= 0; row++) { if (d->isHidden(row)) visualIndex--; } return visualIndex; } QT_END_NAMESPACE #endif // QT_NO_LISTVIEW