sneedmc/launcher/ui/instanceview/InstanceView.cpp
Lenny McLennington e6246a9306
Move MSA Client ID to the same place as the others
MSA Client ID has been moved to CMakeLists.txt, and defaults to the
Client ID for the PolyMC application.

Removed secrets/notsecrets library, replace with (temporary?)
program_info subdirectory.
2021-12-20 02:57:13 +00:00

1002 lines
28 KiB
C++

/* Copyright 2013-2021 MultiMC Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "InstanceView.h"
#include <QPainter>
#include <QApplication>
#include <QtMath>
#include <QMouseEvent>
#include <QListView>
#include <QPersistentModelIndex>
#include <QDrag>
#include <QMimeData>
#include <QCache>
#include <QScrollBar>
#include <QAccessible>
#include "VisualGroup.h"
#include <QDebug>
#include <Application.h>
#include <InstanceList.h>
template <typename T> bool listsIntersect(const QList<T> &l1, const QList<T> t2)
{
for (auto &item : l1)
{
if (t2.contains(item))
{
return true;
}
}
return false;
}
InstanceView::InstanceView(QWidget *parent)
: QAbstractItemView(parent)
{
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
setAcceptDrops(true);
setAutoScroll(true);
}
InstanceView::~InstanceView()
{
qDeleteAll(m_groups);
m_groups.clear();
}
void InstanceView::setModel(QAbstractItemModel *model)
{
QAbstractItemView::setModel(model);
connect(model, &QAbstractItemModel::modelReset, this, &InstanceView::modelReset);
connect(model, &QAbstractItemModel::rowsRemoved, this, &InstanceView::rowsRemoved);
}
void InstanceView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles)
{
scheduleDelayedItemsLayout();
}
void InstanceView::rowsInserted(const QModelIndex &parent, int start, int end)
{
scheduleDelayedItemsLayout();
}
void InstanceView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
{
scheduleDelayedItemsLayout();
}
void InstanceView::modelReset()
{
scheduleDelayedItemsLayout();
}
void InstanceView::rowsRemoved()
{
scheduleDelayedItemsLayout();
}
void InstanceView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
{
QAbstractItemView::currentChanged(current, previous);
// TODO: for accessibility support, implement+register a factory, steal QAccessibleTable from Qt and return an instance of it for InstanceView.
#ifndef QT_NO_ACCESSIBILITY
if (QAccessible::isActive() && current.isValid()) {
QAccessibleEvent event(this, QAccessible::Focus);
event.setChild(current.row());
QAccessible::updateAccessibility(&event);
}
#endif /* !QT_NO_ACCESSIBILITY */
}
class LocaleString : public QString
{
public:
LocaleString(const char *s) : QString(s)
{
}
LocaleString(const QString &s) : QString(s)
{
}
};
inline bool operator<(const LocaleString &lhs, const LocaleString &rhs)
{
return (QString::localeAwareCompare(lhs, rhs) < 0);
}
void InstanceView::updateScrollbar()
{
int previousScroll = verticalScrollBar()->value();
if (m_groups.isEmpty())
{
verticalScrollBar()->setRange(0, 0);
}
else
{
int totalHeight = 0;
// top margin
totalHeight += m_categoryMargin;
int itemScroll = 0;
for (auto category : m_groups)
{
category->m_verticalPosition = totalHeight;
totalHeight += category->totalHeight() + m_categoryMargin;
if(!itemScroll && category->totalHeight() != 0)
{
itemScroll = category->contentHeight() / category->numRows();
}
}
// do not divide by zero
if(itemScroll == 0)
itemScroll = 64;
totalHeight += m_bottomMargin;
verticalScrollBar()->setSingleStep ( itemScroll );
const int rowsPerPage = qMax ( viewport()->height() / itemScroll, 1 );
verticalScrollBar()->setPageStep ( rowsPerPage * itemScroll );
verticalScrollBar()->setRange(0, totalHeight - height());
}
verticalScrollBar()->setValue(qMin(previousScroll, verticalScrollBar()->maximum()));
}
void InstanceView::updateGeometries()
{
geometryCache.clear();
QMap<LocaleString, VisualGroup *> cats;
for (int i = 0; i < model()->rowCount(); ++i)
{
const QString groupName = model()->index(i, 0).data(InstanceViewRoles::GroupRole).toString();
if (!cats.contains(groupName))
{
VisualGroup *old = this->category(groupName);
if (old)
{
auto cat = new VisualGroup(old);
cats.insert(groupName, cat);
cat->update();
}
else
{
auto cat = new VisualGroup(groupName, this);
if(fVisibility) {
cat->collapsed = fVisibility(groupName);
}
cats.insert(groupName, cat);
cat->update();
}
}
}
qDeleteAll(m_groups);
m_groups = cats.values();
updateScrollbar();
viewport()->update();
}
bool InstanceView::isIndexHidden(const QModelIndex &index) const
{
VisualGroup *cat = category(index);
if (cat)
{
return cat->collapsed;
}
else
{
return false;
}
}
VisualGroup *InstanceView::category(const QModelIndex &index) const
{
return category(index.data(InstanceViewRoles::GroupRole).toString());
}
VisualGroup *InstanceView::category(const QString &cat) const
{
for (auto group : m_groups)
{
if (group->text == cat)
{
return group;
}
}
return nullptr;
}
VisualGroup *InstanceView::categoryAt(const QPoint &pos, VisualGroup::HitResults & result) const
{
for (auto group : m_groups)
{
result = group->hitScan(pos);
if(result != VisualGroup::NoHit)
{
return group;
}
}
result = VisualGroup::NoHit;
return nullptr;
}
QString InstanceView::groupNameAt(const QPoint &point)
{
executeDelayedItemsLayout();
VisualGroup::HitResults hitresult;
auto group = categoryAt(point + offset(), hitresult);
if(group && (hitresult & (VisualGroup::HeaderHit | VisualGroup::BodyHit)))
{
return group->text;
}
return QString();
}
int InstanceView::calculateItemsPerRow() const
{
return qFloor((qreal)(contentWidth()) / (qreal)(itemWidth() + m_spacing));
}
int InstanceView::contentWidth() const
{
return width() - m_leftMargin - m_rightMargin;
}
int InstanceView::itemWidth() const
{
return m_itemWidth;
}
void InstanceView::mousePressEvent(QMouseEvent *event)
{
executeDelayedItemsLayout();
QPoint visualPos = event->pos();
QPoint geometryPos = event->pos() + offset();
QPersistentModelIndex index = indexAt(visualPos);
m_pressedIndex = index;
m_pressedAlreadySelected = selectionModel()->isSelected(m_pressedIndex);
m_pressedPosition = geometryPos;
VisualGroup::HitResults hitresult;
m_pressedCategory = categoryAt(geometryPos, hitresult);
if (m_pressedCategory && hitresult & VisualGroup::CheckboxHit)
{
setState(m_pressedCategory->collapsed ? ExpandingState : CollapsingState);
event->accept();
return;
}
if (index.isValid() && (index.flags() & Qt::ItemIsEnabled))
{
if(index != currentIndex())
{
// FIXME: better!
m_currentCursorColumn = -1;
}
// we disable scrollTo for mouse press so the item doesn't change position
// when the user is interacting with it (ie. clicking on it)
bool autoScroll = hasAutoScroll();
setAutoScroll(false);
selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);
setAutoScroll(autoScroll);
QRect rect(visualPos, visualPos);
setSelection(rect, QItemSelectionModel::ClearAndSelect);
// signal handlers may change the model
emit pressed(index);
}
else
{
// Forces a finalize() even if mouse is pressed, but not on a item
selectionModel()->select(QModelIndex(), QItemSelectionModel::Select);
}
}
void InstanceView::mouseMoveEvent(QMouseEvent *event)
{
executeDelayedItemsLayout();
QPoint topLeft;
QPoint visualPos = event->pos();
QPoint geometryPos = event->pos() + offset();
if (state() == ExpandingState || state() == CollapsingState)
{
return;
}
if (state() == DraggingState)
{
topLeft = m_pressedPosition - offset();
if ((topLeft - event->pos()).manhattanLength() > QApplication::startDragDistance())
{
m_pressedIndex = QModelIndex();
startDrag(model()->supportedDragActions());
setState(NoState);
stopAutoScroll();
}
return;
}
if (selectionMode() != SingleSelection)
{
topLeft = m_pressedPosition - offset();
}
else
{
topLeft = geometryPos;
}
if (m_pressedIndex.isValid() && (state() != DragSelectingState) &&
(event->buttons() != Qt::NoButton) && !selectedIndexes().isEmpty())
{
setState(DraggingState);
return;
}
if ((event->buttons() & Qt::LeftButton) && selectionModel())
{
setState(DragSelectingState);
setSelection(QRect(visualPos, visualPos), QItemSelectionModel::ClearAndSelect);
QModelIndex index = indexAt(visualPos);
// set at the end because it might scroll the view
if (index.isValid() && (index != selectionModel()->currentIndex()) &&
(index.flags() & Qt::ItemIsEnabled))
{
selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);
}
}
}
void InstanceView::mouseReleaseEvent(QMouseEvent *event)
{
executeDelayedItemsLayout();
QPoint visualPos = event->pos();
QPoint geometryPos = event->pos() + offset();
QPersistentModelIndex index = indexAt(visualPos);
VisualGroup::HitResults hitresult;
bool click = (index == m_pressedIndex && index.isValid()) ||
(m_pressedCategory && m_pressedCategory == categoryAt(geometryPos, hitresult));
if (click && m_pressedCategory)
{
if (state() == ExpandingState)
{
m_pressedCategory->collapsed = false;
emit groupStateChanged(m_pressedCategory->text, false);
updateGeometries();
viewport()->update();
event->accept();
m_pressedCategory = nullptr;
setState(NoState);
return;
}
else if (state() == CollapsingState)
{
m_pressedCategory->collapsed = true;
emit groupStateChanged(m_pressedCategory->text, true);
updateGeometries();
viewport()->update();
event->accept();
m_pressedCategory = nullptr;
setState(NoState);
return;
}
}
m_ctrlDragSelectionFlag = QItemSelectionModel::NoUpdate;
setState(NoState);
if (click)
{
if (event->button() == Qt::LeftButton)
{
emit clicked(index);
}
QStyleOptionViewItem option = viewOptions();
if (m_pressedAlreadySelected)
{
option.state |= QStyle::State_Selected;
}
if ((model()->flags(index) & Qt::ItemIsEnabled) &&
style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, &option, this))
{
emit activated(index);
}
}
}
void InstanceView::mouseDoubleClickEvent(QMouseEvent *event)
{
executeDelayedItemsLayout();
QModelIndex index = indexAt(event->pos());
if (!index.isValid() || !(index.flags() & Qt::ItemIsEnabled) || (m_pressedIndex != index))
{
QMouseEvent me(
QEvent::MouseButtonPress,
event->localPos(),
event->windowPos(),
event->screenPos(),
event->button(),
event->buttons(),
event->modifiers()
);
mousePressEvent(&me);
return;
}
// signal handlers may change the model
QPersistentModelIndex persistent = index;
emit doubleClicked(persistent);
QStyleOptionViewItem option = viewOptions();
if ((model()->flags(index) & Qt::ItemIsEnabled) && !style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, &option, this))
{
emit activated(index);
}
}
void InstanceView::paintEvent(QPaintEvent *event)
{
executeDelayedItemsLayout();
QPainter painter(this->viewport());
QStyleOptionViewItem option(viewOptions());
option.widget = this;
int wpWidth = viewport()->width();
option.rect.setWidth(wpWidth);
for (int i = 0; i < m_groups.size(); ++i)
{
VisualGroup *category = m_groups.at(i);
int y = category->verticalPosition();
y -= verticalOffset();
QRect backup = option.rect;
int height = category->totalHeight();
option.rect.setTop(y);
option.rect.setHeight(height);
option.rect.setLeft(m_leftMargin);
option.rect.setRight(wpWidth - m_rightMargin);
category->drawHeader(&painter, option);
y += category->totalHeight() + m_categoryMargin;
option.rect = backup;
}
for (int i = 0; i < model()->rowCount(); ++i)
{
const QModelIndex index = model()->index(i, 0);
if (isIndexHidden(index))
{
continue;
}
Qt::ItemFlags flags = index.flags();
option.rect = visualRect(index);
option.features |= QStyleOptionViewItem::WrapText;
if (flags & Qt::ItemIsSelectable && selectionModel()->isSelected(index))
{
option.state |= selectionModel()->isSelected(index) ? QStyle::State_Selected
: QStyle::State_None;
}
else
{
option.state &= ~QStyle::State_Selected;
}
option.state |= (index == currentIndex()) ? QStyle::State_HasFocus : QStyle::State_None;
if (!(flags & Qt::ItemIsEnabled))
{
option.state &= ~QStyle::State_Enabled;
}
itemDelegate()->paint(&painter, option, index);
}
/*
* Drop indicators for manual reordering...
*/
#if 0
if (!m_lastDragPosition.isNull())
{
QPair<Group *, int> pair = rowDropPos(m_lastDragPosition);
Group *category = pair.first;
int row = pair.second;
if (category)
{
int internalRow = row - category->firstItemIndex;
QLine line;
if (internalRow >= category->numItems())
{
QRect toTheRightOfRect = visualRect(category->lastItem());
line = QLine(toTheRightOfRect.topRight(), toTheRightOfRect.bottomRight());
}
else
{
QRect toTheLeftOfRect = visualRect(model()->index(row, 0));
line = QLine(toTheLeftOfRect.topLeft(), toTheLeftOfRect.bottomLeft());
}
painter.save();
painter.setPen(QPen(Qt::black, 3));
painter.drawLine(line);
painter.restore();
}
}
#endif
}
void InstanceView::resizeEvent(QResizeEvent *event)
{
int newItemsPerRow = calculateItemsPerRow();
if(newItemsPerRow != m_currentItemsPerRow)
{
m_currentCursorColumn = -1;
m_currentItemsPerRow = newItemsPerRow;
updateGeometries();
}
else
{
updateScrollbar();
}
}
void InstanceView::dragEnterEvent(QDragEnterEvent *event)
{
executeDelayedItemsLayout();
if (!isDragEventAccepted(event))
{
return;
}
m_lastDragPosition = event->pos() + offset();
viewport()->update();
event->accept();
}
void InstanceView::dragMoveEvent(QDragMoveEvent *event)
{
executeDelayedItemsLayout();
if (!isDragEventAccepted(event))
{
return;
}
m_lastDragPosition = event->pos() + offset();
viewport()->update();
event->accept();
}
void InstanceView::dragLeaveEvent(QDragLeaveEvent *event)
{
executeDelayedItemsLayout();
m_lastDragPosition = QPoint();
viewport()->update();
}
void InstanceView::dropEvent(QDropEvent *event)
{
executeDelayedItemsLayout();
m_lastDragPosition = QPoint();
stopAutoScroll();
setState(NoState);
auto mimedata = event->mimeData();
if (event->source() == this)
{
if(event->possibleActions() & Qt::MoveAction)
{
QPair<VisualGroup *, VisualGroup::HitResults> dropPos = rowDropPos(event->pos());
const VisualGroup *group = dropPos.first;
auto hitresult = dropPos.second;
if (hitresult == VisualGroup::HitResult::NoHit)
{
viewport()->update();
return;
}
auto instanceId = QString::fromUtf8(mimedata->data("application/x-instanceid"));
auto instanceList = APPLICATION->instances().get();
instanceList->setInstanceGroup(instanceId, group->text);
event->setDropAction(Qt::MoveAction);
event->accept();
updateGeometries();
viewport()->update();
}
return;
}
// check if the action is supported
if (!mimedata)
{
return;
}
// files dropped from outside?
if (mimedata->hasUrls())
{
auto urls = mimedata->urls();
event->accept();
emit droppedURLs(urls);
}
}
void InstanceView::startDrag(Qt::DropActions supportedActions)
{
executeDelayedItemsLayout();
QModelIndexList indexes = selectionModel()->selectedIndexes();
if(indexes.count() == 0)
return;
QMimeData *data = model()->mimeData(indexes);
if (!data)
{
return;
}
QRect rect;
QPixmap pixmap = renderToPixmap(indexes, &rect);
QDrag *drag = new QDrag(this);
drag->setPixmap(pixmap);
drag->setMimeData(data);
drag->setHotSpot(m_pressedPosition - rect.topLeft());
Qt::DropAction defaultDropAction = Qt::IgnoreAction;
if (this->defaultDropAction() != Qt::IgnoreAction && (supportedActions & this->defaultDropAction()))
{
defaultDropAction = this->defaultDropAction();
}
/*auto action = */
drag->exec(supportedActions, defaultDropAction);
}
QRect InstanceView::visualRect(const QModelIndex &index) const
{
const_cast<InstanceView*>(this)->executeDelayedItemsLayout();
return geometryRect(index).translated(-offset());
}
QRect InstanceView::geometryRect(const QModelIndex &index) const
{
const_cast<InstanceView*>(this)->executeDelayedItemsLayout();
if (!index.isValid() || isIndexHidden(index) || index.column() > 0)
{
return QRect();
}
int row = index.row();
if(geometryCache.contains(row))
{
return *geometryCache[row];
}
const VisualGroup *cat = category(index);
QPair<int, int> pos = cat->positionOf(index);
int x = pos.first;
// int y = pos.second;
QRect out;
out.setTop(cat->verticalPosition() + cat->headerHeight() + 5 + cat->rowTopOf(index));
out.setLeft(m_spacing + x * (itemWidth() + m_spacing));
out.setSize(itemDelegate()->sizeHint(viewOptions(), index));
geometryCache.insert(row, new QRect(out));
return out;
}
QModelIndex InstanceView::indexAt(const QPoint &point) const
{
const_cast<InstanceView*>(this)->executeDelayedItemsLayout();
for (int i = 0; i < model()->rowCount(); ++i)
{
QModelIndex index = model()->index(i, 0);
if (visualRect(index).contains(point))
{
return index;
}
}
return QModelIndex();
}
void InstanceView::setSelection(const QRect &rect, const QItemSelectionModel::SelectionFlags commands)
{
executeDelayedItemsLayout();
for (int i = 0; i < model()->rowCount(); ++i)
{
QModelIndex index = model()->index(i, 0);
QRect itemRect = visualRect(index);
if (itemRect.intersects(rect))
{
selectionModel()->select(index, commands);
update(itemRect.translated(-offset()));
}
}
}
QPixmap InstanceView::renderToPixmap(const QModelIndexList &indices, QRect *r) const
{
Q_ASSERT(r);
auto paintPairs = draggablePaintPairs(indices, r);
if (paintPairs.isEmpty())
{
return QPixmap();
}
QPixmap pixmap(r->size());
pixmap.fill(Qt::transparent);
QPainter painter(&pixmap);
QStyleOptionViewItem option = viewOptions();
option.state |= QStyle::State_Selected;
for (int j = 0; j < paintPairs.count(); ++j)
{
option.rect = paintPairs.at(j).first.translated(-r->topLeft());
const QModelIndex &current = paintPairs.at(j).second;
itemDelegate()->paint(&painter, option, current);
}
return pixmap;
}
QList<QPair<QRect, QModelIndex>> InstanceView::draggablePaintPairs(const QModelIndexList &indices, QRect *r) const
{
Q_ASSERT(r);
QRect &rect = *r;
QList<QPair<QRect, QModelIndex>> ret;
for (int i = 0; i < indices.count(); ++i)
{
const QModelIndex &index = indices.at(i);
const QRect current = geometryRect(index);
ret += qMakePair(current, index);
rect |= current;
}
return ret;
}
bool InstanceView::isDragEventAccepted(QDropEvent *event)
{
return true;
}
QPair<VisualGroup *, VisualGroup::HitResults> InstanceView::rowDropPos(const QPoint &pos)
{
VisualGroup::HitResults hitresult;
auto group = categoryAt(pos + offset(), hitresult);
return qMakePair<VisualGroup*, int>(group, hitresult);
}
QPoint InstanceView::offset() const
{
return QPoint(horizontalOffset(), verticalOffset());
}
QRegion InstanceView::visualRegionForSelection(const QItemSelection &selection) const
{
QRegion region;
for (auto &range : selection)
{
int start_row = range.top();
int end_row = range.bottom();
for (int row = start_row; row <= end_row; ++row)
{
int start_column = range.left();
int end_column = range.right();
for (int column = start_column; column <= end_column; ++column)
{
QModelIndex index = model()->index(row, column, rootIndex());
region += visualRect(index); // OK
}
}
}
return region;
}
QModelIndex InstanceView::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
{
auto current = currentIndex();
if(!current.isValid())
{
return current;
}
auto cat = category(current);
int group_index = m_groups.indexOf(cat);
if(group_index < 0)
return current;
QPair<int, int> pos = cat->positionOf(current);
int column = pos.first;
int row = pos.second;
if(m_currentCursorColumn < 0)
{
m_currentCursorColumn = column;
}
switch(cursorAction)
{
case MoveUp:
{
if(row == 0)
{
int prevgroupindex = group_index-1;
while(prevgroupindex >= 0)
{
auto prevgroup = m_groups[prevgroupindex];
if(prevgroup->collapsed)
{
prevgroupindex--;
continue;
}
int newRow = prevgroup->numRows() - 1;
int newRowSize = prevgroup->rows[newRow].size();
int newColumn = m_currentCursorColumn;
if (m_currentCursorColumn >= newRowSize)
{
newColumn = newRowSize - 1;
}
return prevgroup->rows[newRow][newColumn];
}
}
else
{
int newRow = row - 1;
int newRowSize = cat->rows[newRow].size();
int newColumn = m_currentCursorColumn;
if (m_currentCursorColumn >= newRowSize)
{
newColumn = newRowSize - 1;
}
return cat->rows[newRow][newColumn];
}
return current;
}
case MoveDown:
{
if(row == cat->rows.size() - 1)
{
int nextgroupindex = group_index+1;
while (nextgroupindex < m_groups.size())
{
auto nextgroup = m_groups[nextgroupindex];
if(nextgroup->collapsed)
{
nextgroupindex++;
continue;
}
int newRowSize = nextgroup->rows[0].size();
int newColumn = m_currentCursorColumn;
if (m_currentCursorColumn >= newRowSize)
{
newColumn = newRowSize - 1;
}
return nextgroup->rows[0][newColumn];
}
}
else
{
int newRow = row + 1;
int newRowSize = cat->rows[newRow].size();
int newColumn = m_currentCursorColumn;
if (m_currentCursorColumn >= newRowSize)
{
newColumn = newRowSize - 1;
}
return cat->rows[newRow][newColumn];
}
return current;
}
case MoveLeft:
{
if(column > 0)
{
m_currentCursorColumn = column - 1;
return cat->rows[row][column - 1];
}
// TODO: moving to previous line
return current;
}
case MoveRight:
{
if(column < cat->rows[row].size() - 1)
{
m_currentCursorColumn = column + 1;
return cat->rows[row][column + 1];
}
// TODO: moving to next line
return current;
}
case MoveHome:
{
m_currentCursorColumn = 0;
return cat->rows[row][0];
}
case MoveEnd:
{
auto last = cat->rows[row].size() - 1;
m_currentCursorColumn = last;
return cat->rows[row][last];
}
default:
break;
}
return current;
}
int InstanceView::horizontalOffset() const
{
return horizontalScrollBar()->value();
}
int InstanceView::verticalOffset() const
{
return verticalScrollBar()->value();
}
void InstanceView::scrollContentsBy(int dx, int dy)
{
scrollDirtyRegion(dx, dy);
viewport()->scroll(dx, dy);
}
void InstanceView::scrollTo(const QModelIndex &index, ScrollHint hint)
{
if (!index.isValid())
return;
const QRect rect = visualRect(index);
if (hint == EnsureVisible && viewport()->rect().contains(rect))
{
viewport()->update(rect);
return;
}
verticalScrollBar()->setValue(verticalScrollToValue(index, rect, hint));
}
int InstanceView::verticalScrollToValue(const QModelIndex &index, const QRect &rect, QListView::ScrollHint hint) const
{
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());
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;
}