File indexing completed on 2024-06-23 05:14:18

 /* -*- mode: c++; c-basic-offset:4 -*-
     utils/scrollarea.cpp
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2007 Klarälvdalens Datakonsult AB
     SPDX-FileCopyrightText: 2022 g10 Code GmbH
     SPDX-FileContributor: Ingo Klöcker <dev@ingo-kloecker.de>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include <config-kleopatra.h>
 
 #include "scrollarea.h"
 
 #include <QApplication>
 #include <QResizeEvent>
 #include <QScreen>
 #include <QScrollBar>
 #include <QVBoxLayout>
 
 using namespace Kleo;
 
 ScrollArea::ScrollArea(QWidget *parent)
     : QScrollArea{parent}
 {
     auto w = new QWidget;
     w->setObjectName(QLatin1StringView("scrollarea_widget"));
     new QVBoxLayout{w};
     setWidget(w);
     setWidgetResizable(true);
     w->installEventFilter(this);
 
     connect(qApp, &QApplication::focusChanged, this, [this](QWidget *old, QWidget *now) {
         Q_UNUSED(old);
         ensureWidgetVisible(now);
     });
 }
 
 ScrollArea::~ScrollArea()
 {
     widget()->removeEventFilter(this);
 }
 
 QSize ScrollArea::minimumSizeHint() const
 {
     const int fw = frameWidth();
     QSize sz{2 * fw, 2 * fw};
     sz += {widget()->minimumSizeHint().width(), 0};
     if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
         sz.setWidth(sz.width() + verticalScrollBar()->sizeHint().width());
     }
     if (horizontalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
         sz.setHeight(sz.height() + horizontalScrollBar()->sizeHint().height());
     }
     return QScrollArea::minimumSizeHint().expandedTo(sz);
 }
 
 QSize ScrollArea::sizeHint() const
 {
     const int fw = frameWidth();
     QSize sz{2 * fw, 2 * fw};
     sz += viewportSizeHint();
     if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
         sz.setWidth(sz.width() + verticalScrollBar()->sizeHint().width());
     }
     if (horizontalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
         sz.setHeight(sz.height() + horizontalScrollBar()->sizeHint().height());
     }
     sz = QScrollArea::sizeHint().expandedTo(sz);
     return sz;
 }
 
 void ScrollArea::adjustSizeOfWindowBy(const QSize &extent)
 {
     if (auto w = window()) {
         const auto currentSize = w->size();
         // we limit the automatic size adjustment to 2/3 of the screen's size
         const auto maxWindowSize = screen()->geometry().size() * 2 / 3;
         const auto newWindowSize = currentSize.expandedTo((currentSize + extent).boundedTo(maxWindowSize));
         if (newWindowSize != currentSize) {
             w->resize(newWindowSize);
         }
     }
 }
 
 bool ScrollArea::eventFilter(QObject *obj, QEvent *ev)
 {
     if (ev->type() == QEvent::Resize && obj == widget() && sizeAdjustPolicy() == AdjustToContents) {
         const auto *const event = static_cast<QResizeEvent *>(ev);
         if (event->size().height() > event->oldSize().height()) {
             const auto currentViewportHeight = viewport()->height();
             const auto wantedViewportHeight = event->size().height();
             const auto wantedAdditionalHeight = wantedViewportHeight - currentViewportHeight;
             if (wantedAdditionalHeight > 0) {
                 adjustSizeOfWindowBy(QSize{0, wantedAdditionalHeight});
             }
         }
     }
     return QScrollArea::eventFilter(obj, ev);
 }
 
 #include "moc_scrollarea.cpp"