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+// -*- c++ -*-
+/* This file is part of the KDE libraries
+    Copyright (C) 1997 Stephan Kulow <coolo@kde.org>
+    Copyright (C) 2001 Carsten Pfeiffer <pfeiffer@kde.org>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef KFILEVIEW_H
+#define KFILEVIEW_H
+
+class QPoint;
+class KActionCollection;
+
+#include <qwidget.h>
+
+#include "kfileitem.h"
+#include "kfile.h"
+
+/**
+ * internal class to make easier to use signals possible
+ * @internal
+ **/
+class KIO_EXPORT KFileViewSignaler : public QObject
+{
+    Q_OBJECT
+
+public:
+    /**
+      * Call this method when an item is selected (depends on single click /
+      * double click configuration). Emits the appropriate signal.
+      **/
+    void activate( const KFileItem *item ) {
+        if ( item->isDir() )
+            emit dirActivated( item );
+        else
+            emit fileSelected( item );
+    }
+    /**
+     * emits the highlighted signal for item. Call this in your view class
+     * whenever the selection changes.
+     */
+    void highlightFile(const KFileItem *i) { emit fileHighlighted(i); }
+
+    void activateMenu( const KFileItem *i, const QPoint& pos ) {
+        emit activatedMenu( i, pos );
+    }
+
+    void changeSorting( QDir::SortSpec sorting ) {
+        emit sortingChanged( sorting );
+    }
+    
+    void dropURLs(const KFileItem *i, QDropEvent*e, const KURL::List&urls) {
+        emit dropped(i, e, urls);
+    }
+
+signals:
+    void dirActivated(const KFileItem*);
+
+    void sortingChanged( QDir::SortSpec );
+
+    /**
+     * the item maybe be 0L, indicating that we're in multiselection mode and
+     * the selection has changed.
+     */
+    void fileHighlighted(const KFileItem*);
+    void fileSelected(const KFileItem*);
+    void activatedMenu( const KFileItem *i, const QPoint& );
+    void dropped(const KFileItem *, QDropEvent*, const KURL::List&);
+};
+
+/**
+  * This class defines an interface to all file views. Its intent is
+  * to allow to switch the view of the files in the selector very easily.
+  * It defines some pure virtual functions, that must be implemented to
+  * make a file view working.
+  *
+  * Since this class is not a widget, but it's meant to be added to other
+  * widgets, its most important function is widget. This should return
+  * a pointer to the implemented widget.
+  *
+  * @short A base class for views of the KDE file selector
+  * @author Stephan Kulow <coolo@kde.org>
+  **/
+class KIO_EXPORT KFileView {
+
+public:
+    KFileView();
+
+    /**
+     * Destructor
+     */
+    virtual ~KFileView();
+
+    /**
+     * inserts a list of items.
+     **/
+    void addItemList(const KFileItemList &list);
+
+    /**
+      * a pure virtual function to get a QWidget, that can be added to
+      * other widgets. This function is needed to make it possible for
+      * derived classes to derive from other widgets.
+      **/
+    virtual QWidget *widget() = 0;
+
+    /**
+     * ### As const-method, to be fixed in 3.0
+     */
+    QWidget *widget() const { return const_cast<KFileView*>(this)->widget(); }
+
+    /**
+     * Sets @p filename the current item in the view, if available.
+     */
+    void setCurrentItem( const QString &filename );
+
+    /**
+     * Reimplement this to set @p item the current item in the view, e.g.
+     * the item having focus.
+     */
+    virtual void setCurrentItem( const KFileItem *item ) = 0;
+
+    /**
+     * @returns the "current" KFileItem, e.g. where the cursor is.
+     * Returns 0L when there is no current item (e.g. in an empty view).
+     * Subclasses have to implement this.
+     */
+    virtual KFileItem *currentFileItem() const = 0;
+
+    /**
+     * Clears the view and all item lists.
+     */
+    virtual void clear();
+
+    /**
+      * does a repaint of the view.
+      *
+      * The default implementation calls
+      * \code
+      * widget()->repaint(f)
+      * \endcode
+      **/
+    virtual void updateView(bool f = true);
+
+    virtual void updateView(const KFileItem*);
+
+    /**
+     * Removes an item from the list; has to be implemented by the view.
+     * Call KFileView::removeItem( item ) after removing it.
+     */
+    virtual void removeItem(const KFileItem *item);
+
+    /**
+     * This hook is called when all items of the currently listed directory
+     * are listed and inserted into the view, i.e. there won't come any new
+     * items anymore.
+     */
+    virtual void listingCompleted();
+
+    /**
+      * Returns the sorting order of the internal list. Newly added files
+      * are added through this sorting.
+      */
+    QDir::SortSpec sorting() const { return m_sorting; }
+
+    /**
+      * Sets the sorting order of the view.
+      *
+      * Default is QDir::Name | QDir::IgnoreCase | QDir::DirsFirst
+      * Override this in your subclass and sort accordingly (usually by
+      * setting the sorting-key for every item and telling QIconView
+      * or QListView to sort.
+      *
+      * A view may choose to use a different sorting than QDir::Name, Time
+      * or Size. E.g. to sort by mimetype or any possible string. Set the
+      * sorting to QDir::Unsorted for that and do the rest internally.
+      *
+      * @see sortingKey
+      */
+    virtual void setSorting(QDir::SortSpec sort);
+
+    /**
+     * Tells whether the current items are in reversed order (shortcut to
+     * sorting() & QDir::Reversed).
+     */
+    bool isReversed() const { return (m_sorting & QDir::Reversed); }
+
+    void sortReversed();
+
+    /**
+      * @returns the number of dirs and files
+      **/
+    uint count() const { return filesNumber + dirsNumber; }
+
+    /**
+      * @returns the number of files.
+      **/
+    uint numFiles() const { return filesNumber; }
+
+    /**
+      * @returns the number of directories
+      **/
+    uint numDirs() const { return dirsNumber; }
+
+    virtual void setSelectionMode( KFile::SelectionMode sm );
+    virtual KFile::SelectionMode selectionMode() const;
+
+    enum ViewMode {
+	Files       = 1,
+	Directories = 2,
+	All = Files | Directories
+    };
+    virtual void setViewMode( ViewMode vm );
+    virtual ViewMode viewMode() const { return view_mode; }
+
+    /**
+     * @returns the localized name of the view, which could be displayed
+     * somewhere, e.g. in a menu, where the user can choose between views.
+     * @see setViewName
+     */
+    QString viewName() const { return m_viewName; }
+
+    /**
+     * Sets the name of the view, which could be displayed somewhere.
+     * E.g. "Image Preview".
+     */
+    void setViewName( const QString& name ) { m_viewName = name; }
+
+    virtual void setParentView(KFileView *parent);
+
+    /**
+     * The derived view must implement this function to add
+     * the file in the widget.
+     *
+     * Make sure to call this implementation, i.e.
+     * KFileView::insertItem( i );
+     *
+     */
+    virtual void insertItem( KFileItem *i);
+
+    /**
+     * pure virtual function, that should be implemented to clear
+     * the view. At this moment the list is already empty
+     **/
+    virtual void clearView() = 0;
+
+    /**
+     * pure virtual function, that should be implemented to make item i
+     * visible, i.e. by scrolling the view appropriately.
+     */
+    virtual void ensureItemVisible( const KFileItem *i ) = 0;
+
+    /**
+     * Clears any selection, unhighlights everything. Must be implemented by
+     * the view.
+     */
+    virtual void clearSelection() = 0;
+
+    /**
+     * Selects all items. You may want to override this, if you can implement
+     * it more efficiently than calling setSelected() with every item.
+     * This works only in Multiselection mode of course.
+     */
+    virtual void selectAll();
+
+    /**
+     * Inverts the current selection, i.e. selects all items, that were up to
+     * now not selected and deselects the other.
+     */
+    virtual void invertSelection();
+
+    /**
+     * Tells the view that it should highlight the item.
+     * This function must be implemented by the view.
+     **/
+    virtual void setSelected(const KFileItem *, bool enable) = 0;
+
+    /**
+     * @returns whether the given item is currently selected.
+     * Must be implemented by the view.
+     */
+    virtual bool isSelected( const KFileItem * ) const = 0;
+
+    /**
+     * @returns all currently highlighted items.
+     */
+    const KFileItemList * selectedItems() const;
+
+    /**
+     * @returns all items currently available in the current sort-order
+     */
+    const KFileItemList * items() const;
+
+    virtual KFileItem * firstFileItem() const = 0;
+    virtual KFileItem * nextItem( const KFileItem * ) const = 0;
+    virtual KFileItem * prevItem( const KFileItem * ) const = 0;
+
+    /**
+     * This is a KFileDialog specific hack: we want to select directories with
+     * single click, but not files. But as a generic class, we have to be able
+     * to select files on single click as well.
+     *
+     * This gives us the opportunity to do both.
+     *
+     * Every view has to decide when to call select( item ) when a file was
+     * single-clicked, based on onlyDoubleClickSelectsFiles().
+     */
+    void setOnlyDoubleClickSelectsFiles( bool enable ) {
+	myOnlyDoubleClickSelectsFiles = enable;
+    }
+
+    /**
+     * @returns whether files (not directories) should only be select()ed by
+     * double-clicks.
+     * @see setOnlyDoubleClickSelectsFiles
+     */
+    bool onlyDoubleClickSelectsFiles() const {
+	return myOnlyDoubleClickSelectsFiles;
+    }
+
+    /**
+     * increases the number of dirs and files.
+     * @returns true if the item fits the view mode
+     */
+    bool updateNumbers(const KFileItem *i);
+
+    /**
+     * @returns the view-specific action-collection. Every view should
+     * add its actions here (if it has any) to make them available to
+     * e.g. the KDirOperator's popup-menu.
+     */
+    virtual KActionCollection * actionCollection() const;
+
+    KFileViewSignaler * signaler() const { return sig; }
+
+    virtual void readConfig( KConfig *, const QString& group = QString::null );
+    virtual void writeConfig( KConfig *, const QString& group = QString::null);
+
+    /**
+     * Various options for drag and drop support. 
+     * These values can be or'd together.
+     * @li @p AutoOpenDirs Automatically open directory after hovering above it 
+     * for a short while while dragging.
+     * @since 3.2
+     */
+    enum DropOptions {
+	AutoOpenDirs  = 1
+    };
+    /**
+     * Specify DND options. See DropOptions for details.
+     * All options are disabled by default.
+     * @since 3.2
+     */
+    // KDE 4: Make virtual
+    void setDropOptions(int options);
+    
+    /**
+     * Returns the DND options in effect.
+     * See DropOptions for details.
+     * @since 3.2
+     */
+    int dropOptions();
+    
+    /**
+     * This method calculates a QString from the given parameters, that is
+     * suitable for sorting with e.g. QIconView or QListView. Their
+     * Item-classes usually have a setKey( const QString& ) method or a virtual
+     * method QString key() that is used for sorting.
+     *
+     * @param value Any string that should be used as sort criterion
+     * @param isDir Tells whether the key is computed for an item representing
+     *              a directory (directories are usually sorted before files)
+     * @param sortSpec An ORed combination of QDir::SortSpec flags.
+     *                 Currently, the values IgnoreCase, Reversed and
+     *                 DirsFirst are taken into account.
+     */
+    static QString sortingKey( const QString& value, bool isDir, int sortSpec);
+
+    /**
+     * An overloaded method that takes not a QString, but a number as sort
+     * criterion. You can use this for file-sizes or dates/times for example.
+     * If you use a time_t, you need to cast that to KIO::filesize_t because
+     * of ambiguity problems.
+     */
+    static QString sortingKey( KIO::filesize_t value, bool isDir,int sortSpec);
+
+    /**
+     * @internal
+     * delay before auto opening a directory
+     */
+    static int autoOpenDelay();
+
+protected:
+    /**
+     * @internal
+     * class to distribute the signals
+     **/
+    KFileViewSignaler *sig;
+
+private:
+    static QDir::SortSpec defaultSortSpec;
+    QDir::SortSpec m_sorting;
+    QString m_viewName;
+
+    /**
+     * counters
+     **/
+    uint filesNumber;
+    uint dirsNumber;
+
+    ViewMode view_mode;
+    KFile::SelectionMode selection_mode;
+
+    // never use! It's only guaranteed to contain valid items in the items()
+    // method!
+    mutable KFileItemList m_itemList;
+
+    mutable KFileItemList *m_selectedList;
+    bool myOnlyDoubleClickSelectsFiles;
+
+protected:
+    virtual void virtual_hook( int id, void* data );
+    /* @internal for virtual_hook */
+    enum { VIRTUAL_SET_DROP_OPTIONS = 1 };
+    void setDropOptions_impl(int options);
+private:
+    class KFileViewPrivate;
+    KFileViewPrivate *d;
+};
+
+#endif // KFILEINFOLISTWIDGET_H