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/*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "focusedtreeview.h"
#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::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();
}
}
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