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#include "qlistview.h"
#ifndef QT_NO_LISTVIEW
#include <qabstractitemdelegate.h>
#include <qapplication.h>
#include <qpainter.h>
#include <qbitmap.h>
#include <qvector.h>
#include <qstyle.h>
#include <qevent.h>
#include <qscrollbar.h>
#include <qrubberband.h>
#include <private/qlistview_p.h>
#include <qdebug.h>
#ifndef QT_NO_ACCESSIBILITY
#include <qaccessible.h>
#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<QModelIndex> 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) {
for (int i = d->hiddenRows.count() - 1; i >= 0; --i) {
int hiddenRow = d->hiddenRows.at(i).row();
if (hiddenRow >= start && hiddenRow <= end) {
d->hiddenRows.remove(i);
}
}
}
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<QListModeViewBase *>(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;
}
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<QModelIndex> 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<QModelIndex>::const_iterator end = toBeRendered.constEnd();
for (QVector<QModelIndex>::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;
}
if (const QWidget *widget = d->editorForIndex(*it).editor) {
QRegion itemGeometry(option.rect);
QRegion widgetGeometry(widget->geometry());
painter.save();
painter.setClipRegion(itemGeometry.subtracted(widgetGeometry));
d->delegateForIndex(*it)->paint(&painter, option, *it);
painter.restore();
} else {
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<QModelIndex> 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<QModelIndex> 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<QModelIndex> 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<QModelIndex> 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
*/
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;
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)
selectionRegion += QRegion(visualRect(d->model->index(r, c, parent)));
} 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());
selectionRegion += QRegion(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 (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<QModelIndex> &candidates) const
{
int distance = 0;
int shortest = INT_MAX;
QModelIndex closest;
QVector<QModelIndex>::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<QModelIndex> intersectVector = intersectingSet(rect);
QVector<QModelIndex>::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<QListModeViewBase *>(commonListView)->position(pos, rect, idx);
else
return QAbstractItemViewPrivate::position(pos, rect, idx);
}
#endif
/*
* Common ListView Implementation
*/
void QCommonListViewBase::appendHiddenRow(int row)
{
dd->hiddenRows.append(dd->model->index(row, 0, qq->rootIndex()));
}
void QCommonListViewBase::removeHiddenRow(int row)
{
dd->hiddenRows.remove(dd->hiddenRows.indexOf(dd->model->index(row, 0, qq->rootIndex())));
}
void QCommonListViewBase::updateHorizontalScrollBar(const QSize &step)
{
horizontalScrollBar()->setSingleStep(step.width() + spacing());
horizontalScrollBar()->setPageStep(viewport()->width());
horizontalScrollBar()->setRange(0, contentsSize.width() - viewport()->width() - 2 * spacing());
}
void QCommonListViewBase::updateVerticalScrollBar(const QSize &step)
{
verticalScrollBar()->setSingleStep(step.height() + spacing());
verticalScrollBar()->setPageStep(viewport()->height());
verticalScrollBar()->setRange(0, contentsSize.height() - viewport()->height() - 2 * spacing());
}
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
void QListModeViewBase::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);
}
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();
QModelIndex index = qq->indexAt(event->pos());
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);
switch (dd->dropIndicatorPosition) {
case QAbstractItemView::AboveItem:
if (dd->isIndexDropEnabled(index.parent())) {
dd->dropIndicatorRect = QRect(rect.left(), 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(), 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();
}
#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
value = qBound(0, scrollValueMap.at(verticalScrollBar()->value()), 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);
}
} 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);
int previousCoordinate = segmentPositions.at(previousValue);
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);
int previousCoordinate = segmentPositions.at(previousValue);
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<int>(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()));
}
}
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;
// 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;
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<QModelIndex> QListModeViewBase::intersectingSet(const QRect &area) const
{
QVector<QModelIndex> 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<int>(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<int>(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<int> 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;
if (!wrap) {
int topIndex = index;
const int bottomIndex = topIndex;
const int bottomCoordinate = flowPositions.at(index);
while (topIndex > 0 &&
(bottomCoordinate - flowPositions.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 flowPositions.at(index); // ### always pixel based for now
} else if (!segmentStartRows.isEmpty()) { // we are scrolling in the "segment" direction
int segment = qBinarySearch<int>(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
void QIconModeViewBase::paintDragDrop(QPainter *painter)
{
if (!draggedItems.isEmpty() && viewport()->rect().contains(draggedItemsPos)) {
//we need to draw the items that arre dragged
painter->translate(draggedItemsDelta());
QStyleOptionViewItemV4 option = viewOptions();
option.state &= ~QStyle::State_MouseOver;
QVector<QModelIndex>::const_iterator it = draggedItems.begin();
QListViewItem item = indexToListViewItem(*it);
for (; it != draggedItems.end(); ++it) {
item = indexToListViewItem(*it);
option.rect = viewItemRect(item);
delegate(*it)->paint(painter, option, *it);
}
}
}
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);
}
QDrag *drag = new QDrag(qq);
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<QModelIndex> &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<QModelIndex> 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<QModelIndex> 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 {
const QListViewItem item = items.at(info.first - 1);
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<int>(info.grid.width(), item->w);
item->h = qMin<int>(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 = QSize(rect.width(), rect.height());
// 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<QModelIndex> QIconModeViewBase::intersectingSet(const QRect &area) const
{
QIconModeViewBase *that = const_cast<QIconModeViewBase*>(this);
QBspTree::Data data(static_cast<void*>(that));
QVector<QModelIndex> res;
that->interSectingVector = &res;
that->tree.climbTree(area, &QIconModeViewBase::addLeaf, data);
that->interSectingVector = 0;
return res;
}
QRect QIconModeViewBase::itemsRect(const QVector<QModelIndex> &indexes) const
{
QVector<QModelIndex>::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<int> &leaf, const QRect &area,
uint visited, QBspTree::Data data)
{
QListViewItem *vi;
QIconModeViewBase *_this = static_cast<QIconModeViewBase *>(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;
QAccessible::updateAccessibility(viewport(), entry, QAccessible::Focus);
}
}
#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;
QAccessible::updateAccessibility(viewport(), entry, QAccessible::Selection);
}
QModelIndex desel = deselected.indexes().value(0);
if (desel.isValid()) {
int entry = visualIndex(desel) + 1;
QAccessible::updateAccessibility(viewport(), entry, QAccessible::SelectionRemove);
}
}
#endif
QAbstractItemView::selectionChanged(selected, deselected);
}
int QListView::visualIndex(const QModelIndex &index) const
{
Q_D(const QListView);
d->executePostedLayout();
QListViewItem itm = d->indexToListViewItem(index);
return d->commonListView->itemIndex(itm);
}
QT_END_NAMESPACE
#endif // QT_NO_LISTVIEW