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/***************************************************************************
* Copyright (C) 2011 by Peter Penz <[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 KITEMLISTHEADERWIDGET_H
#define KITEMLISTHEADERWIDGET_H
#include "dolphin_export.h"
#include <QGraphicsWidget>
#include <QHash>
#include <QList>
class KItemModelBase;
/**
* @brief Widget the implements the header for KItemListView showing the currently used roles.
*
* The widget is an internal API, the user of KItemListView may only access the
* class KItemListHeader.
*/
class DOLPHIN_EXPORT KItemListHeaderWidget : public QGraphicsWidget
{
Q_OBJECT
public:
KItemListHeaderWidget(QGraphicsWidget* parent = 0);
virtual ~KItemListHeaderWidget();
void setModel(KItemModelBase* model);
KItemModelBase* model() const;
void setAutomaticColumnResizing(bool automatic);
bool automaticColumnResizing() const;
void setColumns(const QList<QByteArray>& roles);
QList<QByteArray> columns() const;
void setColumnWidth(const QByteArray& role, qreal width);
qreal columnWidth(const QByteArray& role) const;
/**
* Sets the column-width that is required to show the role unclipped.
*/
void setPreferredColumnWidth(const QByteArray& role, qreal width);
qreal preferredColumnWidth(const QByteArray& role) const;
void setOffset(qreal offset);
qreal offset() const;
qreal minimumColumnWidth() const;
virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
signals:
/**
* Is emitted if the width of a visible role has been adjusted by the user with the mouse
* (no signal is emitted if KItemListHeader::setVisibleRoleWidth() is invoked).
*/
void columnWidthChanged(const QByteArray& role,
qreal currentWidth,
qreal previousWidth);
/**
* Is emitted if the user has released the mouse button after adjusting the
* width of a visible role.
*/
void columnWidthChangeFinished(const QByteArray& role,
qreal currentWidth);
/**
* Is emitted if the position of the column has been changed.
*/
void columnMoved(const QByteArray& role, int currentIndex, int previousIndex);
/**
* Is emitted if the user has changed the sort order by clicking on a
* header item. The sort order of the model has already been adjusted to
* the current sort order. Note that no signal will be emitted if the
* sort order of the model has been changed without user interaction.
*/
void sortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous);
/**
* Is emitted if the user has changed the sort role by clicking on a
* header item. The sort role of the model has already been adjusted to
* the current sort role. Note that no signal will be emitted if the
* sort role of the model has been changed without user interaction.
*/
void sortRoleChanged(const QByteArray& current, const QByteArray& previous);
protected:
virtual void mousePressEvent(QGraphicsSceneMouseEvent* event);
virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent* event);
virtual void mouseMoveEvent(QGraphicsSceneMouseEvent* event);
virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event);
virtual void hoverEnterEvent(QGraphicsSceneHoverEvent* event);
virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent* event);
virtual void hoverMoveEvent(QGraphicsSceneHoverEvent* event);
private slots:
void slotSortRoleChanged(const QByteArray& current, const QByteArray& previous);
void slotSortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous);
private:
void paintRole(QPainter* painter,
const QByteArray& role,
const QRectF& rect,
int orderIndex,
QWidget* widget = 0) const;
void updatePressedRoleIndex(const QPointF& pos);
void updateHoveredRoleIndex(const QPointF& pos);
int roleIndexAt(const QPointF& pos) const;
bool isAboveRoleGrip(const QPointF& pos, int roleIndex) const;
/**
* Creates a pixmap of the role with the index \a roleIndex that is shown
* during moving a role.
*/
QPixmap createRolePixmap(int roleIndex) const;
/**
* @return Target index of the currently moving visible role based on the current
* state of m_movingRole.
*/
int targetOfMovingRole() const;
/**
* @return x-position of the left border of the role \a role.
*/
qreal roleXPosition(const QByteArray& role) const;
private:
enum RoleOperation
{
NoRoleOperation,
ResizeRoleOperation,
MoveRoleOperation
};
bool m_automaticColumnResizing;
KItemModelBase* m_model;
qreal m_offset;
QList<QByteArray> m_columns;
QHash<QByteArray, qreal> m_columnWidths;
QHash<QByteArray, qreal> m_preferredColumnWidths;
int m_hoveredRoleIndex;
int m_pressedRoleIndex;
RoleOperation m_roleOperation;
QPointF m_pressedMousePos;
struct MovingRole
{
QPixmap pixmap;
int x;
int xDec;
int index;
} m_movingRole;
};
#endif
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