mirror of
https://invent.kde.org/system/dolphin
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65d3008d51
CCMAIL: christoph@maxiom.de BUG: 205664 CCBUG: 212989 svn path=/trunk/KDE/kdebase/apps/; revision=1059377
80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
/***************************************************************************
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* Copyright (C) 2008 by Peter Penz <peter.penz@gmx.at> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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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 *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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***************************************************************************/
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#ifndef DOLPHINVIEWAUTOSCROLLER_H
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#define DOLPHINVIEWAUTOSCROLLER_H
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#include <QTime>
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#include <QObject>
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class QAbstractItemView;
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class QModelIndex;
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class QTimer;
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/**
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* @brief Assures that an autoscrolling is done for item views.
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*
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* This is a workaround as QAbstractItemView::setAutoScroll() is not usable
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* when selecting items (see Qt issue #214542).
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*/
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class DolphinViewAutoScroller : public QObject
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{
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Q_OBJECT
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public:
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DolphinViewAutoScroller(QAbstractItemView* parent);
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virtual ~DolphinViewAutoScroller();
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bool isActive() const;
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/**
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* Must be invoked by the parent item view, when QAbstractItemView::currentChanged()
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* has been called. Assures that the current item stays visible when it has been
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* changed by the keyboard.
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*/
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void handleCurrentIndexChange(const QModelIndex& current, const QModelIndex& previous);
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protected:
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virtual bool eventFilter(QObject* watched, QEvent* event);
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private slots:
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void scrollViewport();
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private:
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void triggerAutoScroll();
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void stopAutoScroll();
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/**
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* Calculates the scroll increment dependent from
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* the cursor position \a cursorPos and the range 0 - \a rangeSize - 1.
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*/
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int calculateScrollIncrement(int cursorPos, int rangeSize) const;
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private:
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bool m_rubberBandSelection;
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bool m_keyPressed;
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bool m_initializedTimestamp;
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int m_horizontalScrollInc;
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int m_verticalScrollInc;
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QAbstractItemView* m_itemView;
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QTimer* m_timer;
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QTime m_timestamp;
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};
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#endif
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