src/kitemviews/kstandarditemlistwidget.h

   1 /***************************************************************************
   2  *   Copyright (C) 2012 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 KSTANDARDITEMLISTWIDGET_H
  21 #define KSTANDARDITEMLISTWIDGET_H
  22
  23 #include <libdolphin_export.h>
  24
  25 #include <kitemviews/kitemlistwidget.h>
  26
  27 #include <QPixmap>
  28 #include <QPointF>
  29 #include <QStaticText>
  30
  31 class KItemListRoleEditor;
  32 class KItemListStyleOption;
  33 class KItemListView;
  34
  35 class LIBDOLPHINPRIVATE_EXPORT KStandardItemListWidgetInformant : public KItemListWidgetInformant
  36 {
  37 public:
  38     KStandardItemListWidgetInformant();
  39     virtual ~KStandardItemListWidgetInformant();
  40
  41     virtual QSizeF itemSizeHint(int index, const KItemListView* view) const;
  42
  43     virtual qreal preferredRoleColumnWidth(const QByteArray& role,
  44                                            int index,
  45                                            const KItemListView* view) const;
  46 protected:
  47     /**
  48      * @return String representation of the role \a role. The representation of
  49      *         a role might depend on other roles, so the values of all roles
  50      *         are passed as parameter.
  51      */
  52     virtual QString roleText(const QByteArray& role,
  53                              const QHash<QByteArray, QVariant>& values) const;
  54
  55     friend class KStandardItemListWidget; // Accesses roleText()
  56 };
  57
  58 /**
  59  * @brief Itemlist widget implementation for KStandardItemView and KStandardItemModel.
  60  */
  61 class LIBDOLPHINPRIVATE_EXPORT KStandardItemListWidget : public KItemListWidget
  62 {
  63     Q_OBJECT
  64
  65 public:
  66     enum Layout
  67     {
  68         IconsLayout,
  69         CompactLayout,
  70         DetailsLayout
  71     };
  72
  73     KStandardItemListWidget(KItemListWidgetInformant* informant, QGraphicsItem* parent);
  74     virtual ~KStandardItemListWidget();
  75
  76     void setLayout(Layout layout);
  77     Layout layout() const;
  78
  79     void setSupportsItemExpanding(bool supportsItemExpanding);
  80     bool supportsItemExpanding() const;
  81
  82     virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
  83
  84     virtual QRectF iconRect() const;
  85     virtual QRectF textRect() const;
  86     virtual QRectF textFocusRect() const;
  87     virtual QRectF expansionToggleRect() const;
  88     virtual QRectF selectionToggleRect() const;
  89     virtual QPixmap createDragPixmap(const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
  90
  91     static KItemListWidgetInformant* createInformant();
  92
  93 protected:
  94     /**
  95      * Invalidates the cache which results in calling KStandardItemListWidget::refreshCache() as
  96      * soon as the item need to gets repainted.
  97      */
  98     void invalidateCache();
  99
 100     /**
 101      * Is called if the cache got invalidated by KStandardItemListWidget::invalidateCache().
 102      * The default implementation is empty.
 103      */
 104     virtual void refreshCache();
 105
 106     /**
 107      * @return True if the give role should be right aligned when showing it inside a column.
 108      *         Per default false is returned.
 109      */
 110     virtual bool isRoleRightAligned(const QByteArray& role) const;
 111
 112     /**
 113      * @return True if the item should be visually marked as hidden item. Per default
 114      *         false is returned.
 115      */
 116     virtual bool isHidden() const;
 117
 118     /**
 119      * @return A font based on baseFont which is customized according to the data shown in the widget.
 120      */
 121     virtual QFont customizedFont(const QFont& baseFont) const;
 122
 123     void setTextColor(const QColor& color);
 124     QColor textColor() const;
 125
 126     void setOverlay(const QPixmap& overlay);
 127     QPixmap overlay() const;
 128
 129     /**
 130      * @see KStandardItemListWidgetInformant::roleText().
 131      */
 132     QString roleText(const QByteArray& role, const QHash<QByteArray, QVariant>& values) const;
 133
 134     virtual void dataChanged(const QHash<QByteArray, QVariant>& current, const QSet<QByteArray>& roles = QSet<QByteArray>());
 135     virtual void visibleRolesChanged(const QList<QByteArray>& current, const QList<QByteArray>& previous);
 136     virtual void columnWidthChanged(const QByteArray& role, qreal current, qreal previous);
 137     virtual void styleOptionChanged(const KItemListStyleOption& current, const KItemListStyleOption& previous);
 138     virtual void hoveredChanged(bool hovered);
 139     virtual void selectedChanged(bool selected);
 140     virtual void siblingsInformationChanged(const QBitArray& current, const QBitArray& previous);
 141     virtual void editedRoleChanged(const QByteArray& current, const QByteArray& previous);
 142     virtual void resizeEvent(QGraphicsSceneResizeEvent* event);
 143     virtual void showEvent(QShowEvent* event);
 144     virtual void hideEvent(QHideEvent* event);
 145
 146 private slots:
 147     void slotCutItemsChanged();
 148     void slotRoleEditingCanceled(int index, const QByteArray& role, const QVariant& value);
 149     void slotRoleEditingFinished(int index, const QByteArray& role, const QVariant& value);
 150
 151 private:
 152     void triggerCacheRefreshing();
 153     void updateExpansionArea();
 154     void updatePixmapCache();
 155
 156     void updateTextsCache();
 157     void updateIconsLayoutTextCache();
 158     void updateCompactLayoutTextCache();
 159     void updateDetailsLayoutTextCache();
 160
 161     void updateAdditionalInfoTextColor();
 162
 163     void drawPixmap(QPainter* painter, const QPixmap& pixmap);
 164     void drawSiblingsInformation(QPainter* painter);
 165
 166     QRectF roleEditingRect(const QByteArray &role) const;
 167
 168     /**
 169      * Closes the role editor and returns the focus back
 170      * to the KItemListContainer.
 171      */
 172     void closeRoleEditor();
 173
 174     static QPixmap pixmapForIcon(const QString& name, int size);
 175
 176     /**
 177      * @return Preferred size of the rating-image based on the given
 178      *         style-option. The height of the font is taken as
 179      *         reference.
 180      */
 181     static QSizeF preferredRatingSize(const KItemListStyleOption& option);
 182
 183     /**
 184      * @return Horizontal padding in pixels that is added to the required width of
 185      *         a column to display the content.
 186      */
 187     static qreal columnPadding(const KItemListStyleOption& option);
 188
 189 private:
 190     bool m_isCut;
 191     bool m_isHidden;
 192     QFont m_customizedFont;
 193     QFontMetrics m_customizedFontMetrics;
 194     bool m_isExpandable;
 195     bool m_supportsItemExpanding;
 196
 197     bool m_dirtyLayout;
 198     bool m_dirtyContent;
 199     QSet<QByteArray> m_dirtyContentRoles;
 200
 201     Layout m_layout;
 202     QPointF m_pixmapPos;
 203     QPixmap m_pixmap;
 204     QSize m_scaledPixmapSize;
 205
 206     QRectF m_iconRect;          // Cache for KItemListWidget::iconRect()
 207     QPixmap m_hoverPixmap;      // Cache for modified m_pixmap when hovering the item
 208
 209     struct TextInfo
 210     {
 211         QPointF pos;
 212         QStaticText staticText;
 213     };
 214     QHash<QByteArray, TextInfo*> m_textInfo;
 215
 216     QRectF m_textRect;
 217
 218     QList<QByteArray> m_sortedVisibleRoles;
 219
 220     QRectF m_expansionArea;
 221
 222     QColor m_customTextColor;
 223     QColor m_additionalInfoTextColor;
 224
 225     QPixmap m_overlay;
 226     QPixmap m_rating;
 227
 228     KItemListRoleEditor* m_roleEditor;
 229
 230     friend class KStandardItemListWidgetInformant; // Accesses private static methods to be able to
 231                                                    // share a common layout calculation
 232 };
 233
 234 #endif
 235
 236