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/*
SPDX-License-Identifier: LGPL-2.0-only
*/
#include "focusedtreeview.h"
#include <QResizeEvent>
#include <QScrollBar>
#include <QTimer>
namespace KDevelop {
class FocusedTreeViewPrivate
{
public:
bool autoScrollAtEnd = false;
QTimer timer;
bool wasAtEnd = false;
int insertedBegin = -1;
int insertedEnd = -1;
};
FocusedTreeView::FocusedTreeView(QWidget* parent)
: QTreeView(parent)
, d_ptr(new FocusedTreeViewPrivate)
{
Q_D(FocusedTreeView);
setVerticalScrollMode(ScrollPerItem);
d->timer.setInterval(200);
d->timer.setSingleShot(true);
connect(&d->timer, &QTimer::timeout, this, &FocusedTreeView::delayedAutoScrollAndResize);
connect(verticalScrollBar(), &QScrollBar::valueChanged,
&d->timer, QOverload<>::of(&QTimer::start));
}
FocusedTreeView::~FocusedTreeView()
{
}
void FocusedTreeView::setModel(QAbstractItemModel* newModel)
{
if (QAbstractItemModel* oldModel = model()) {
disconnect(oldModel, nullptr, this, nullptr);
}
QTreeView::setModel(newModel);
if (newModel) {
connect(newModel, &QAbstractItemModel::rowsAboutToBeInserted, this, &FocusedTreeView::rowsAboutToBeInserted);
connect(newModel, &QAbstractItemModel::rowsRemoved, this, &FocusedTreeView::rowsRemoved);
}
}
void FocusedTreeView::setAutoScrollAtEnd(bool enable)
{
Q_D(FocusedTreeView);
d->autoScrollAtEnd = enable;
}
int FocusedTreeView::sizeHintForColumn(int column) const
{
QModelIndex i = indexAt(QPoint(0, 0));
if (i.isValid()) {
QSize hint = sizeHintForIndex(i);
int maxWidth = hint.width();
if (hint.height()) {
//Also consider one item above, because else we can get problems with
//the vertical scroll-bar
for (int a = -1; a < (height() / hint.height()) + 1; ++a) {
QModelIndex current = i.sibling(i.row() + a, column);
QSize tempHint = sizeHintForIndex(current);
if (tempHint.width() > maxWidth)
maxWidth = tempHint.width();
}
}
return maxWidth;
}
return columnWidth(column);
}
void FocusedTreeView::fitColumns()
{
if (!model()) {
return;
}
for (int c = 0, columnCount = model()->columnCount(); c < columnCount; ++c) {
resizeColumnToContents(c);
}
}
void FocusedTreeView::resizeEvent(QResizeEvent* event)
{
QTreeView::resizeEvent(event);
// Rewrap lines when the width changes.
if (wordWrap() && event->size().width() != event->oldSize().width()) {
// fitColumns() calls resizeColumnToContents(), which executes items layout
// scheduled here (QTreeView::setWordWrap() also schedules items layout).
// Redoing the items layout is necessary for correct rewrapping, but causes a roughly
// 5-second-long UI freeze inside QItemDelegate::sizeHint() when the user selects
// a 100'000th line of output. The freeze happens because non-uniform row heights (necessary
// for word-wrapping) force QTreeView to calculate heights of all items above the selected one.
// The number of consecutive resize events does not affect the duration of the resulting UI freeze.
scheduleDelayedItemsLayout();
// Resizing columns to contents here rewraps lines immediately rather than only after subsequent vertical
// scrolling. This is relatively fast and does not noticeably contribute to the UI freeze duration.
fitColumns();
}
}
void FocusedTreeView::delayedAutoScrollAndResize()
{
Q_D(FocusedTreeView);
if (!model()) {
// might happen on shutdown
return;
}
if (d->autoScrollAtEnd && d->insertedBegin != -1 && d->wasAtEnd && d->insertedEnd == model()->rowCount()) {
scrollToBottom();
}
for (int a = 0; a < model()->columnCount(); ++a)
resizeColumnToContents(a);
d->insertedBegin = -1;
// Timer is single-shot, but the code above may have recursively restarted the timer
// (e.g. via the connection from the scroll-bar signal), so explicitly prevent a redundant
// call here.
d->timer.stop();
}
void FocusedTreeView::rowsAboutToBeInserted(const QModelIndex&, int first, int last)
{
Q_D(FocusedTreeView);
if (d->insertedBegin == -1) {
d->insertedBegin = d->insertedEnd = first;
d->wasAtEnd = true;
QModelIndex last = model()->index(model()->rowCount() - 1, 0);
if (last.isValid()) {
auto rect = visualRect(last);
d->wasAtEnd = rect.isValid() && viewport()->rect().intersects(rect);
}
}
if (first == d->insertedEnd) {
d->insertedEnd = last + 1;
}
if (!d->timer.isActive())
d->timer.start();
}
// Removing rows can make longer rows move into the visible region, so we also must trigger a
// column resize
void FocusedTreeView::rowsRemoved(const QModelIndex& parent, int first, int last)
{
Q_D(FocusedTreeView);
QTreeView::rowsRemoved(parent, first, last);
if (!d->timer.isActive())
d->timer.start();
}
}
#include "moc_focusedtreeview.cpp"
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