src/kitemviews/kitemlistheader_p.h

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #ifndef KITEMLISTHEADER_H
  21 #define KITEMLISTHEADER_H
  22
  23 #include <libdolphin_export.h>
  24 #include <QGraphicsWidget>
  25 #include <QHash>
  26 #include <QList>
  27
  28 class KItemModelBase;
  29
  30 /**
  31  * @brief Header for KItemListView that shows the currently used roles.
  32  */
  33 class LIBDOLPHINPRIVATE_EXPORT KItemListHeader : public QGraphicsWidget
  34 {
  35     Q_OBJECT
  36
  37 public:
  38     KItemListHeader(QGraphicsWidget* parent = 0);
  39     virtual ~KItemListHeader();
  40
  41     void setModel(KItemModelBase* model);
  42     KItemModelBase* model() const;
  43
  44     void setVisibleRoles(const QList<QByteArray>& roles);
  45     QList<QByteArray> visibleRoles() const;
  46
  47     void setVisibleRolesWidths(const QHash<QByteArray, qreal> rolesWidths);
  48     QHash<QByteArray, qreal> visibleRolesWidths() const;
  49
  50     qreal minimumRoleWidth() const;
  51
  52     virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
  53
  54 signals:
  55     /**
  56      * Is emitted if the width of a visible role has been adjusted by the user with the mouse
  57      * (no signal is emitted if KItemListHeader::setVisibleRoles() is invoked).
  58      */
  59     void visibleRoleWidthChanged(const QByteArray& role,
  60                                  qreal currentWidth,
  61                                  qreal previousWidth);
  62
  63     /**
  64      * Is emitted if the user has changed the sort order by clicking on a
  65      * header item. The sort order of the model has already been adjusted to
  66      * the current sort order. Note that no signal will be emitted if the
  67      * sort order of the model has been changed without user interaction.
  68      */
  69     void sortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous);
  70
  71     /**
  72      * Is emitted if the user has changed the sort role by clicking on a
  73      * header item. The sort role of the model has already been adjusted to
  74      * the current sort role. Note that no signal will be emitted if the
  75      * sort role of the model has been changed without user interaction.
  76      */
  77     void sortRoleChanged(const QByteArray& current, const QByteArray& previous);
  78
  79 protected:
  80     virtual void mousePressEvent(QGraphicsSceneMouseEvent* event);
  81     virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent* event);
  82     virtual void mouseMoveEvent(QGraphicsSceneMouseEvent* event);
  83     virtual void hoverEnterEvent(QGraphicsSceneHoverEvent* event);
  84     virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent* event);
  85     virtual void hoverMoveEvent(QGraphicsSceneHoverEvent* event);
  86
  87 private slots:
  88     void slotSortRoleChanged(const QByteArray& current, const QByteArray& previous);
  89     void slotSortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous);
  90
  91 private:
  92     void paintRole(QPainter* painter, const QByteArray& role, const QRectF& rect, int orderIndex);
  93
  94     void updatePressedRoleIndex(const QPointF& pos);
  95     void updateHoveredRoleIndex(const QPointF& pos);
  96     int roleIndexAt(const QPointF& pos) const;
  97     bool isAboveRoleGrip(const QPointF& pos, int roleIndex) const;
  98
  99 private:
 100     enum RoleOperation
 101     {
 102         NoRoleOperation,
 103         ResizeRoleOperation,
 104         MoveRoleOperation
 105     };
 106
 107     KItemModelBase* m_model;
 108     QList<QByteArray> m_visibleRoles;
 109     QHash<QByteArray, qreal> m_visibleRolesWidths;
 110
 111     int m_hoveredRoleIndex;
 112     int m_pressedRoleIndex;
 113     RoleOperation m_roleOperation;
 114     QPointF m_pressedMousePos;
 115 };
 116
 117 #endif
 118
 119