75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/****************************************************************************
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**
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** This file is part of the LibreCAD project, a 2D CAD program
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**
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** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
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** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
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**
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**
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** This file may be distributed and/or modified under the terms of the
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** GNU General Public License version 2 as published by the Free Software
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** Foundation and appearing in the file gpl-2.0.txt included in the
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** packaging of this file.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**
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** This copyright notice MUST APPEAR in all copies of the script!
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**
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**********************************************************************/
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#ifndef QG_SCROLLBAR_H
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#define QG_SCROLLBAR_H
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#include <QScrollBar>
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#include <QWheelEvent>
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/**
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* A small wrapper for the Qt scrollbar. This class offers a slot
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* for scroll events.
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*/
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class QG_ScrollBar: public QScrollBar {
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Q_OBJECT
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public:
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QG_ScrollBar(QWidget* parent=0)
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: QScrollBar(parent) {
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sizeHintCache = QScrollBar::sizeHint();
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}
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QG_ScrollBar(Qt::Orientation orientation,
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QWidget* parent=0)
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: QScrollBar(orientation, parent) {
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sizeHintCache = QScrollBar::sizeHint();
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}
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// This sizeHint caches the height value. Out of profiling (see #727),
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// it appears that sizeHint calls all the way down to the underlying
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// windowing system to check the size.
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QSize sizeHint() const override final {
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return sizeHintCache;
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}
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public slots:
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void slotWheelEvent(QWheelEvent* e) {
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wheelEvent(e);
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}
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void resizeEvent(QResizeEvent* event) override {
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sizeHintCache = QScrollBar::sizeHint();
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QScrollBar::resizeEvent(event);
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}
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private:
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QSize sizeHintCache;
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};
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#endif
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