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 "dolphin_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 DOLPHIN_EXPORT KStandardItemListWidgetInformant : public KItemListWidgetInformant
  36 {
  37 public:
  38     KStandardItemListWidgetInformant();
  39     virtual ~KStandardItemListWidgetInformant();
  40
  41     virtual void calculateItemSizeHints(QVector<qreal>& logicalHeightHints, qreal& logicalWidthHint, const KItemListView* view) const Q_DECL_OVERRIDE;
  42
  43     virtual qreal preferredRoleColumnWidth(const QByteArray& role,
  44                                            int index,
  45                                            const KItemListView* view) const Q_DECL_OVERRIDE;
  46 protected:
  47     /**
  48      * @return The value of the "text" role. The default implementation returns
  49      *         view->model()->data(index)["text"]. If a derived class can
  50      *         prevent the (possibly expensive) construction of the
  51      *         QHash<QByteArray, QVariant> returned by KItemModelBase::data(int),
  52      *         it can reimplement this function.
  53      */
  54     virtual QString itemText(int index, const KItemListView* view) const;
  55
  56     /**
  57      * @return The value of the "isLink" role. The default implementation returns false.
  58      *         The derived class should reimplement this function, when information about
  59      *         links is available and in usage.
  60      */
  61     virtual bool itemIsLink(int index, const KItemListView* view) const;
  62
  63     /**
  64      * @return String representation of the role \a role. The representation of
  65      *         a role might depend on other roles, so the values of all roles
  66      *         are passed as parameter.
  67      */
  68     virtual QString roleText(const QByteArray& role,
  69                              const QHash<QByteArray, QVariant>& values) const;
  70
  71     /**
  72     * @return A font based on baseFont which is customized for symlinks.
  73     */
  74     virtual QFont customizedFontForLinks(const QFont& baseFont) const;
  75
  76     void calculateIconsLayoutItemSizeHints(QVector<qreal>& logicalHeightHints, qreal& logicalWidthHint, const KItemListView* view) const;
  77     void calculateCompactLayoutItemSizeHints(QVector<qreal>& logicalHeightHints, qreal& logicalWidthHint, const KItemListView* view) const;
  78     void calculateDetailsLayoutItemSizeHints(QVector<qreal>& logicalHeightHints, qreal& logicalWidthHint, const KItemListView* view) const;
  79
  80     friend class KStandardItemListWidget; // Accesses roleText()
  81 };
  82
  83 /**
  84  * @brief Itemlist widget implementation for KStandardItemView and KStandardItemModel.
  85  */
  86 class DOLPHIN_EXPORT KStandardItemListWidget : public KItemListWidget
  87 {
  88     Q_OBJECT
  89
  90 public:
  91     enum Layout
  92     {
  93         IconsLayout,
  94         CompactLayout,
  95         DetailsLayout
  96     };
  97
  98     KStandardItemListWidget(KItemListWidgetInformant* informant, QGraphicsItem* parent);
  99     virtual ~KStandardItemListWidget();
 100
 101     void setLayout(Layout layout);
 102     Layout layout() const;
 103
 104     void setSupportsItemExpanding(bool supportsItemExpanding);
 105     bool supportsItemExpanding() const;
 106
 107     virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
 108
 109     virtual QRectF iconRect() const Q_DECL_OVERRIDE;
 110     virtual QRectF textRect() const Q_DECL_OVERRIDE;
 111     virtual QRectF textFocusRect() const Q_DECL_OVERRIDE;
 112     virtual QRectF selectionRect() const Q_DECL_OVERRIDE;
 113     virtual QRectF expansionToggleRect() const Q_DECL_OVERRIDE;
 114     virtual QRectF selectionToggleRect() const Q_DECL_OVERRIDE;
 115     virtual QPixmap createDragPixmap(const QStyleOptionGraphicsItem* option, QWidget* widget = 0) Q_DECL_OVERRIDE;
 116
 117     static KItemListWidgetInformant* createInformant();
 118
 119 protected:
 120     /**
 121      * Invalidates the cache which results in calling KStandardItemListWidget::refreshCache() as
 122      * soon as the item need to gets repainted.
 123      */
 124     void invalidateCache();
 125
 126     /**
 127      * Is called if the cache got invalidated by KStandardItemListWidget::invalidateCache().
 128      * The default implementation is empty.
 129      */
 130     virtual void refreshCache();
 131
 132     /**
 133      * @return True if the give role should be right aligned when showing it inside a column.
 134      *         Per default false is returned.
 135      */
 136     virtual bool isRoleRightAligned(const QByteArray& role) const;
 137
 138     /**
 139      * @return True if the item should be visually marked as hidden item. Per default
 140      *         false is returned.
 141      */
 142     virtual bool isHidden() const;
 143
 144     /**
 145      * @return A font based on baseFont which is customized according to the data shown in the widget.
 146      */
 147     virtual QFont customizedFont(const QFont& baseFont) const;
 148
 149     virtual QPalette::ColorRole normalTextColorRole() const;
 150
 151     void setTextColor(const QColor& color);
 152     QColor textColor() const;
 153
 154     void setOverlay(const QPixmap& overlay);
 155     QPixmap overlay() const;
 156
 157     /**
 158      * @see KStandardItemListWidgetInformant::roleText().
 159      */
 160     QString roleText(const QByteArray& role, const QHash<QByteArray, QVariant>& values) const;
 161
 162     /**
 163      * Fixes:
 164      * Select the text without MIME-type extension
 165      * This is file-item-specific and should be moved
 166      * into KFileItemListWidget.
 167      *
 168      * Inherited classes can define, if the MIME-type extension
 169      * should be selected or not.
 170      *
 171      * @return Selection length (with or without MIME-type extension)
 172      */
 173     virtual int selectionLength(const QString& text) const;
 174
 175     virtual void dataChanged(const QHash<QByteArray, QVariant>& current, const QSet<QByteArray>& roles = QSet<QByteArray>()) Q_DECL_OVERRIDE;
 176     virtual void visibleRolesChanged(const QList<QByteArray>& current, const QList<QByteArray>& previous) Q_DECL_OVERRIDE;
 177     virtual void columnWidthChanged(const QByteArray& role, qreal current, qreal previous) Q_DECL_OVERRIDE;
 178     virtual void styleOptionChanged(const KItemListStyleOption& current, const KItemListStyleOption& previous) Q_DECL_OVERRIDE;
 179     virtual void hoveredChanged(bool hovered) Q_DECL_OVERRIDE;
 180     virtual void selectedChanged(bool selected) Q_DECL_OVERRIDE;
 181     virtual void siblingsInformationChanged(const QBitArray& current, const QBitArray& previous) Q_DECL_OVERRIDE;
 182     virtual void editedRoleChanged(const QByteArray& current, const QByteArray& previous) Q_DECL_OVERRIDE;
 183     virtual void resizeEvent(QGraphicsSceneResizeEvent* event) Q_DECL_OVERRIDE;
 184     virtual void showEvent(QShowEvent* event) Q_DECL_OVERRIDE;
 185     virtual void hideEvent(QHideEvent* event) Q_DECL_OVERRIDE;
 186
 187 private slots:
 188     void slotCutItemsChanged();
 189     void slotRoleEditingCanceled(const QByteArray& role, const QVariant& value);
 190     void slotRoleEditingFinished(const QByteArray& role, const QVariant& value);
 191
 192 private:
 193     void triggerCacheRefreshing();
 194     void updateExpansionArea();
 195     void updatePixmapCache();
 196
 197     void updateTextsCache();
 198     void updateIconsLayoutTextCache();
 199     void updateCompactLayoutTextCache();
 200     void updateDetailsLayoutTextCache();
 201
 202     void updateAdditionalInfoTextColor();
 203
 204     void drawPixmap(QPainter* painter, const QPixmap& pixmap);
 205     void drawSiblingsInformation(QPainter* painter);
 206
 207     QRectF roleEditingRect(const QByteArray &role) const;
 208
 209     /**
 210      * Closes the role editor and returns the focus back
 211      * to the KItemListContainer.
 212      */
 213     void closeRoleEditor();
 214
 215     static QPixmap pixmapForIcon(const QString& name, const QStringList& overlays, int size);
 216
 217     /**
 218      * @return Preferred size of the rating-image based on the given
 219      *         style-option. The height of the font is taken as
 220      *         reference.
 221      */
 222     static QSizeF preferredRatingSize(const KItemListStyleOption& option);
 223
 224     /**
 225      * @return Horizontal padding in pixels that is added to the required width of
 226      *         a column to display the content.
 227      */
 228     static qreal columnPadding(const KItemListStyleOption& option);
 229
 230 private:
 231     bool m_isCut;
 232     bool m_isHidden;
 233     QFont m_customizedFont;
 234     QFontMetrics m_customizedFontMetrics;
 235     bool m_isExpandable;
 236     bool m_supportsItemExpanding;
 237
 238     bool m_dirtyLayout;
 239     bool m_dirtyContent;
 240     QSet<QByteArray> m_dirtyContentRoles;
 241
 242     Layout m_layout;
 243     QPointF m_pixmapPos;
 244     QPixmap m_pixmap;
 245     QSize m_scaledPixmapSize; //Size of the pixmap in device independent pixels
 246
 247     QRectF m_iconRect;          // Cache for KItemListWidget::iconRect()
 248     QPixmap m_hoverPixmap;      // Cache for modified m_pixmap when hovering the item
 249
 250     struct TextInfo
 251     {
 252         QPointF pos;
 253         QStaticText staticText;
 254     };
 255     QHash<QByteArray, TextInfo*> m_textInfo;
 256
 257     QRectF m_textRect;
 258
 259     QList<QByteArray> m_sortedVisibleRoles;
 260
 261     QRectF m_expansionArea;
 262
 263     QColor m_customTextColor;
 264     QColor m_additionalInfoTextColor;
 265
 266     QPixmap m_overlay;
 267     QPixmap m_rating;
 268
 269     KItemListRoleEditor* m_roleEditor;
 270     KItemListRoleEditor* m_oldRoleEditor;
 271
 272     friend class KStandardItemListWidgetInformant; // Accesses private static methods to be able to
 273                                                    // share a common layout calculation
 274 };
 275
 276 #endif