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squawk/ui/utils/expandinglist.cpp

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/*
* Squawk messenger.
* Copyright (C) 2019 Yury Gubich <blue@macaw.me>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "expandinglist.h"
#include <QApplication>
ExpandingList::ExpandingList(QWidget* parent) :
QListView(parent),
scrollBarExtent(qApp->style()->pixelMetric(QStyle::PM_ScrollBarExtent))
{
setVerticalScrollBarPolicy(Qt::ScrollBarPolicy::ScrollBarAlwaysOff);
}
bool ExpandingList::hasHeightForWidth() const {
#if (QT_VERSION < QT_VERSION_CHECK(6, 2, 0))
return
QAbstractItemView::sizeAdjustPolicy() == QAbstractScrollArea::AdjustToContents &&
scrollBarExtent > 0;
#else
return false;
#endif
}
int ExpandingList::heightForWidth(int width) const {
QAbstractItemModel* md = model();
if (md == nullptr)
return 0;
if (md->rowCount() == 0)
return 0;
const int rowCount = md->rowCount();
int height = 0;
for (int i = 0; i < rowCount; i++)
height += QListView::sizeHintForRow(i);
height += frameWidth();
int minWidth = sizeHintForColumn(0) + frameWidth() + 1;
if (width <= minWidth)
height += scrollBarExtent + 1;
return height;
}