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/***************************************************************************
* Copyright (C) 2010 by Peter Penz <[email protected]> *
* 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 DOLPHINTREEVIEW_H
#define DOLPHINTREEVIEW_H
#include <QTreeView>
#include <libdolphin_export.h>
/**
* @brief Extends QTreeView by a custom selection- and hover-mechanism.
*
* QTreeView does not respect the width of a cell for the hover-feedback
* and when selecting items. DolphinTreeView improves this by respecting the
* content-width of the first column. The selection-mechanism also
* respects the content-width.
*/
class LIBDOLPHINPRIVATE_EXPORT DolphinTreeView : public QTreeView
{
Q_OBJECT
public:
explicit DolphinTreeView(QWidget* parent = 0);
virtual ~DolphinTreeView();
virtual QModelIndex indexAt (const QPoint& point) const;
virtual QRegion visualRegionForSelection(const QItemSelection& selection) const;
protected:
/**
* @return True, if the item with the index \p index accepts a drop. In this
* case a visual feedback for the user is given during dragging. Per
* default false is returned.
*/
virtual bool acceptsDrop(const QModelIndex& index) const;
virtual bool event(QEvent* event);
virtual void mousePressEvent(QMouseEvent* event);
virtual void mouseMoveEvent(QMouseEvent* event);
virtual void mouseReleaseEvent(QMouseEvent* event);
virtual void startDrag(Qt::DropActions supportedActions);
virtual void dragEnterEvent(QDragEnterEvent* event);
virtual void dragMoveEvent(QDragMoveEvent* event);
virtual void dragLeaveEvent(QDragLeaveEvent* event);
virtual void paintEvent(QPaintEvent* event);
virtual void keyPressEvent(QKeyEvent* event);
virtual void keyReleaseEvent(QKeyEvent* event);
virtual void currentChanged(const QModelIndex& current, const QModelIndex& previous);
virtual void setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command);
virtual void scrollTo(const QModelIndex& index, ScrollHint hint = EnsureVisible);
private slots:
/**
* If the elastic band is currently shown, update the elastic band based on
* the current mouse position and ensure that the selection is the set of items
* intersecting it.
*/
void updateElasticBandSelection();
/**
* Updates the destination \a destination from
* the elastic band to the current mouse position and triggers
* an update.
*/
void updateElasticBand();
/**
* Returns the rectangle for the elastic band dependent from the
* origin \a origin, the current destination
* \a destination and the viewport position.
*/
QRect elasticBandRect() const;
private:
/**
* Returns true, if \a pos is within the expanding toggle of a tree.
*/
bool isAboveExpandingToggle(const QPoint& pos) const;
private:
bool m_keyPressed; // true if a key is pressed currently; info used by currentChanged()
bool m_expandingTogglePressed;
bool m_useDefaultIndexAt; // true, if QTreeView::indexAt() should be used
bool m_ignoreScrollTo; // true if calls to scrollTo(...) should do nothing.
QRect m_dropRect;
struct ElasticBand
{
ElasticBand();
// Elastic band origin and destination coordinates are relative to t
// he origin of the view, not the viewport.
bool show;
QPoint origin;
QPoint destination;
// Optimization mechanisms for use with elastic band selection.
// Basically, allow "incremental" updates to the selection based
// on the last elastic band shape.
QPoint lastSelectionOrigin;
QPoint lastSelectionDestination;
// If true, compute the set of selected elements from scratch (slower)
bool ignoreOldInfo;
// Edges of the filenames that are closest to the edges of oldSelectionRect.
// Used to decide whether horizontal changes in the elastic band are likely
// to require us to re-check which items are selected.
int outsideNearestLeftEdge;
int outsideNearestRightEdge;
int insideNearestLeftEdge;
int insideNearestRightEdge;
// The set of items that were selected at the time this band was shown.
// NOTE: Unless CTRL was pressed when the band was created, this is always empty.
QItemSelection originalSelection;
} m_band;
};
#endif
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