src/ui/adjustingscrollarea.h

0001 /* -*- mode: c++; c-basic-offset:4 -*-
0002     ui/adjustingscrollarea.h
0003
0004     This file is part of Kleopatra, the KDE keymanager
0005     SPDX-FileCopyrightText: 2007 Klarälvdalens Datakonsult AB
0006     SPDX-FileCopyrightText: 2022 g10 Code GmbH
0007     SPDX-FileContributor: Ingo Klöcker <dev@ingo-kloecker.de>
0008
0009     SPDX-License-Identifier: GPL-2.0-or-later
0010 */
0011
0012 #pragma once
0013
0014 #include <QScrollArea>
0015
0016 namespace Kleo
0017 {
0018
0019 /**
0020  * This class improves a few aspects of QScrollArea for usage by us, in
0021  * particular, for vertically scrollable widgets.
0022  *
0023  * If sizeAdjustPolicy is set to QAbstractScrollArea::AdjustToContents,
0024  * then the scroll area will (try to) adjust its size to the widget to avoid
0025  * scroll bars as much as possible.
0026  */
0027 class AdjustingScrollArea : public QScrollArea
0028 {
0029     Q_OBJECT
0030
0031 public:
0032     /**
0033      * Creates a scroll area with a QWidget with QVBoxLayout that is flagged
0034      * as resizable.
0035      */
0036     explicit AdjustingScrollArea(QWidget *parent = nullptr);
0037     ~AdjustingScrollArea() override;
0038
0039     /**
0040      * Reimplemented to add the minimum size hint of the widget.
0041      */
0042     QSize minimumSizeHint() const override;
0043
0044     /**
0045      * Reimplemented to remove the caching of the size/size hint of the
0046      * widget and to add the horizontal size hint of the vertical scroll bar
0047      * unless it is explicitly turned off.
0048      */
0049     QSize sizeHint() const override;
0050
0051 private:
0052     void adjustSizeOfWindowBy(const QSize &extent);
0053     bool eventFilter(QObject *obj, QEvent *ev) override;
0054 };
0055
0056 }