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/***************************************************************************
* Copyright (C) 2008 by Simon St James <[email protected]> *
* *
* 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 2 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, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#ifndef FOLDEREXPANDER_H
#define FOLDEREXPANDER_H
// Needs to be exported as FoldersPanel uses it.
#include "libdolphin_export.h"
#include <QObject>
#include <QPoint>
class QAbstractItemView;
class QTreeView;
class QTimer;
class QSortFilterProxyModel;
class QModelIndex;
class KDirModel;
/**
* Grants auto expanding functionality to the provided item view.
* Qt has its own auto expand mechanism, but this works only
* for QTreeView. Auto expanding of folders is turned on
* per default.
*
* If the provided view is an instance of the class QTreeView, the
* expansion of the directory is automatically done on hover. Otherwise
* the enterDir() signal is emitted and the caller needs to ensure that
* the requested directory is entered.
*
* The FolderExpander becomes a child of the provided view.
*/
class LIBDOLPHINPRIVATE_EXPORT FolderExpander : public QObject
{
Q_OBJECT
public:
FolderExpander(QAbstractItemView* view, QSortFilterProxyModel* proxyModel);
virtual ~FolderExpander();
void setEnabled(bool enabled);
bool enabled() const;
signals:
/**
* Is emitted if the directory \a dirModelIndex should be entered. The
* signal is not emitted when a QTreeView is used, as the entering of
* the directory is already provided by expanding the tree node.
*/
void enterDir(const QModelIndex& dirModelIndex);
private slots:
void viewScrolled();
void autoExpandTimeout();
private:
bool m_enabled;
QAbstractItemView* m_view;
QSortFilterProxyModel* m_proxyModel;
QTimer* m_autoExpandTriggerTimer;
QPoint m_autoExpandPos;
static const int AUTO_EXPAND_DELAY = 700;
/**
* Watchs the drag/move events for the view to decide
* whether auto expanding of a folder should be triggered.
*/
bool eventFilter(QObject* watched, QEvent* event);
};
#endif
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