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+/*  This file is part of the KDE Libraries
+ *  Copyright (C) 1999-2000 Espen Sand (espen@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., 59 Temple Place - Suite 330,
+ *  Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _KJANUS_WIDGET_H_
+#define _KJANUS_WIDGET_H_
+
+#include <qptrlist.h>
+#include <qwidget.h>
+#include <qmap.h>
+#include <qgrid.h>
+#include <klistbox.h>
+
+/*US
+#include <qptrlist.h>
+#include <qpixmap.h>
+#include <qsplitter.h>
+
+#include <qstringlist.h>
+#include <qmap.h>
+
+*/
+
+class KSeparator;
+class KListView;
+class QWidgetStack;
+class QLabel;
+class QTabWidget;
+class QListViewItem;
+class QVBox;
+class QHBox;
+
+/**
+ * Provides a number of ready to use layouts (faces). It is used
+ * as an internal widget in @ref KDialogBase, but can also used as a
+ * widget of its own.
+ *
+ * It provides TreeList, IconList, Tabbed, Plain and Swallow layouts.
+ *
+ * The TreeList face provides a list in the left area and pages in the
+ * right. The area are separated by a movable splitter. The style is somewhat
+ * similar to the layout in the Control Center. A page is raised by
+ * selecting the corresponding tree list item.
+ *
+ * The IconList face provides an icon list in the left area and pages in the
+ * right. For each entry the Icon is on top with the text below. The style
+ * is somewhat similar to the layout of the Eudora configuation dialog box.
+ * A page is raised by selecting the corresponding icon list item. The
+ * preferred icon size is 32x32 pixels.
+ *
+ * The Tabbed face is a common tabbed widget. The procedure for creating a
+ * page is similar for creating a TreeList. This has the advantage that if
+ * your widget contain too many pages it is trivial to convert it into a
+ * TreeList. Just change the face in the KJanusWidget constructor to
+ * KJanusWidget::TreeList and you have a tree list layout instead.
+ *
+ * The Plain face provides an empty widget (QFrame) where you can place your
+ * widgets. The KJanusWidget makes no assumptions regarding the contents so
+ * you are free to add whatever you want.
+ *
+ * The Swallow face is provided in order to simplify the usage of existing
+ * widgets and to allow changing the visible widget. You specify the widget
+ * to be displayed by @ref #setSwallowedWidget(). Your widget will be
+ * reparented inside the widget. You can specify a Null (0) widget. A empty
+ * space is then displayed.
+ *
+ * For all modes it is important that you specify the @ref QWidget::minimumSize()
+ * on the page, plain widget or the swallowed widget. If you use a QLayout
+ * on the page, plain widget or the swallowed widget this will be taken care
+ * of automatically. The size is used when the KJanusWidget determines its
+ * own minimum size. You get the minimum size by using the
+ * @ref #minimumSizeHint() or @ref #sizeHint() methods.
+ *
+ * Pages that have been added in TreeList, IconList or Tabbed mode can be
+ * removed by simply deleting the page. However, it would be preferable to use
+ * the QObject::deleteLater() function on the page as the main event loop
+ * may have optimized UI update events of the page by scheduling them for later.
+ *
+ * @short Easy to use widget with many layouts
+ * @author Espen Sand (espen@kde.org)
+ */
+class KJanusWidget : public QWidget
+{
+  Q_OBJECT
+
+  private:
+    class IconListBox : public KListBox
+    {
+      public:
+        IconListBox( QWidget *parent=0, const char *name=0, WFlags f=0 );
+        void updateMinimumHeight();
+        void updateWidth();
+        void invalidateHeight();
+        void invalidateWidth();
+        void setShowAll( bool showAll );
+
+      private:
+        bool mShowAll;
+        bool mHeightValid;
+        bool mWidthValid;
+    };
+
+  public:
+    enum Face
+    {
+      TreeList = 0,
+      Tabbed,
+      Plain,
+      Swallow,
+      IconList
+    };
+
+  public:
+
+    /**
+     * Constructor where you specify the face.
+     *
+     * @param parent Parent of the widget.
+     * @param name Widget name.
+     * @param int face The kind of dialog, Use TreeList, Tabbed, Plain or
+     * Swallow.
+     */
+    KJanusWidget( QWidget *parent=0, const char *name=0, int face=Plain );
+
+    /**
+     * Destructor.
+     */
+    ~KJanusWidget();
+
+    /**
+     * Raises the page which was added by @ref addPage().
+     *
+     * @param index The index of the page you want to raise.
+     */
+    virtual bool showPage( int index );
+
+    /**
+     * Returns the index of the page that are currently displayed.
+     *
+     * @return The index or -1 if the face is not Tabbed, TreeList or
+     *         IconList.
+     */
+    virtual int  activePageIndex() const;
+
+    /**
+     * Use this to verify
+     * that no memory allocation failed.
+     *
+     * @return true if the widget was properly created.
+     */
+    virtual bool isValid() const;
+
+    /**
+     * Returns the face type.
+     *
+     * @return The face type.
+     */
+    virtual int face() const;
+
+    /**
+     * Returns the minimum size that must be made available for the widget
+     * so that UIs can be displayed properly
+     *
+     * @return The minimum size.
+     */
+    virtual QSize minimumSizeHint() const;
+
+    /**
+     * Returns the recommended size for the widget in order to be displayed
+     * properly.
+     *
+     * @return The recommended size.
+     */
+    virtual QSize sizeHint() const;
+
+    /**
+     * Returns the empty widget that is available in Plain mode.
+     *
+     * @return The widget or 0 if the face in not Plain.
+     */
+    virtual QFrame *plainPage();
+
+    /**
+     * Add a new page when the class is used in TreeList, IconList or Tabbed
+     * mode. The returned widget is empty and you must add your widgets
+     * as children to this widget. In most cases you must create a layout
+     * manager and associate it with this widget as well.
+         *
+         * Deleting the returned frame will cause the listitem or tab to be
+         * removed (you can re-add a page with the same name later.
+     *
+     * @param item String used in the list or Tab item.
+     * @param header A longer string used in TreeList and IconList mode to
+     *        describe the contents of a page. If empty, the item string
+     *        will be used instead.
+     * @param pixmap Used in IconList mode or in TreeList mode. You should
+     *        prefer a pixmap with size 32x32 pixels.
+     *
+     * @return The empty page or 0 if the face is not TreeList, IconList or
+     *         Tabbed.
+     */
+    virtual QFrame *addPage(const QString &item,const QString &header=QString::null,
+                    const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * This is like addPage just above, with the difference that the first
+     * element is a list of strings. These strings are used to form a path
+     * of folders down to the given page. The initial elements are names
+     * for the folders, while the last element is the name of the page.
+     * Note: This does yet only work for the TreeList face. Later this may
+     * be added for the IconList face too. In other faces than the
+     * TreeList, all the strings except the last one is ignored.
+            * Deleting the returned frame will cause the listitem or tab to be
+         * removed (you can re-add a page with the same name later.
+     *
+         * Deleting the returned frame will cause the listitem or tab to be
+         * removed (you can re-add a page with the same name later.
+     **/
+     virtual QFrame *addPage(const QStringList &items, const QString &header=QString::null,
+                    const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * Add a new page when the class is used in TreeList, IconList or Tabbed
+     * mode. The returned widget is empty and you must add your widgets
+     * as children to this widget. The returned widget is a @ref QVBox
+     * so it contains a QVBoxLayout layout that lines up the child widgets
+     * are vertically.
+     *
+         * Deleting the returned frame will cause the listitem or tab to be
+         * removed (you can re-add a page with the same name later.
+     *
+     * @param item String used in the list or Tab item.
+     * @param header A longer string used in TreeList and IconList mode to
+     *        describe the contents of a page. If empty, the item string
+     *        will be used instead.
+     * @param pixmap Used in IconList mode or in TreeList mode. You should
+     *        prefer a pixmap with size 32x32 pixels.
+     *
+     * @return The empty page or 0 if the face is not TreeList, IconList or
+     *         Tabbed.  */
+    virtual QVBox *addVBoxPage( const QString &item,
+                        const QString &header=QString::null,
+                        const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * This is like addVBoxPage just above, with the difference that the first
+     * element is a list of strings. These strings are used to form a path
+     * of folders down to the given page. The initial elements are names
+     * for the folders, while the last element is the name of the page.
+     * Note: This does yet only work for the TreeList face. Later this may
+     * be added for the IconList face too. In other faces than the
+     * TreeList, all the strings except the last one is ignored.
+     *
+     * Deleting the returned frame will cause the listitem or tab to be
+     * removed (you can re-add a page with the same name later.
+     **/
+    virtual QVBox *addVBoxPage( const QStringList &items,
+                        const QString &header=QString::null,
+                        const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * Add a new page when the class is used in TreeList, IconList or Tabbed
+     * mode. The returned widget is empty and you must add your widgets
+     * as children to this widget. The returned widget is a @ref QHBox
+     * so it contains a QHBoxLayout layout that lines up the child widgets
+     * are horizontally.
+     *
+     * Deleting the returned frame will cause the listitem or tab to be
+     * removed (you can re-add a page with the same name later.
+     *
+     * @param item String used in the list or Tab item.
+     * @param header A longer string used in TreeList and IconList mode to
+     *        describe the contents of a page. If empty, the item string
+     *        will be used instead.
+     * @param pixmap Used in IconList mode or in TreeList mode. You should
+     *        prefer a pixmap with size 32x32 pixels.
+     *
+     * @return The empty page or 0 if the face is not TreeList, IconList or
+     *         Tabbed.
+     */
+    virtual QHBox *addHBoxPage( const QString &itemName,
+                        const QString &header=QString::null,
+                        const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * This is like addHBoxPage just above, with the difference that the first
+     * element is a list of strings. These strings are used to form a path
+     * of folders down to the given page. The initial elements are names
+     * for the folders, while the last element is the name of the page.
+     * Note: This does yet only work for the TreeList face. Later this may
+     * be added for the IconList face too. In other faces than the
+     * TreeList, all the strings except the last one is ignored.
+     *
+     * Deleting the returned frame will cause the listitem or tab to be
+     * removed (you can re-add a page with the same name later.
+     **/
+    virtual QHBox *addHBoxPage( const QStringList &items,
+                        const QString &header=QString::null,
+                        const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * Add a new page when the class is used in either TreeList or Tabbed
+     * mode. The returned widget is empty and you must add your widgets
+     * as children to this widget. The returned widget is a @ref QGrid
+     * so it contains a QGridLayout layout that places up the child widgets
+     * in a grid.
+     *
+     * Deleting the returned frame will cause the listitem or tab to be
+     * removed (you can re-add a page with the same name later.
+     *
+     * @param n Specifies the number of columns if 'dir' is QGrid::Horizontal
+     *          or the number of rows if 'dir' is QGrid::Vertical.
+     * @param dir Can be QGrid::Horizontal or QGrid::Vertical.
+     * @param item String used in the list or Tab item.
+     * @param header A longer string used in TreeList and IconList mode to
+     *        describe the contents of a page. If empty, the item string
+     *        will be used instead.
+     * @param pixmap Used in IconList mode or in TreeList mode. You should
+     *        prefer a pixmap with size 32x32 pixels.
+     *
+     * @return The empty page or 0 if the face is not TreeList, IconList or
+     *         Tabbed.
+     */
+//US changed Orientation into Direction for compatibility
+    virtual QGrid *addGridPage( int n, QGrid::Direction dir,
+                        const QString &itemName,
+                        const QString &header=QString::null,
+                        const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * This is like addGridPage just above, with the difference that the first
+     * element is a list of strings. These strings are used to form a path
+     * of folders down to the given page. The initial elements are names
+     * for the folders, while the last element is the name of the page.
+     * Note: This does yet only work for the TreeList face. Later this may
+     * be added for the IconList face too. In other faces than the
+     * TreeList, all the strings except the last one is ignored.
+     *
+     * Deleting the returned frame will cause the listitem or tab to be
+     * removed (you can re-add a page with the same name later.
+     **/
+//US changed Orientation into Direction for compatibility
+    virtual QGrid *addGridPage( int n, QGrid::Direction dir,
+                        const QStringList &items,
+                        const QString &header=QString::null,
+                        const QPixmap &pixmap=QPixmap() );
+
+    /**
+     * @short Removes a page created with @ref addPage, @ref addVBoxPage,
+     * @ref addHBoxPage or @ref addGridPage. If the page has already
+     * been deleted or has already been removed, nothing happens. The widget
+     * itself is not deleted.
+     *
+     * @param page The widget returned by @ref addPage , @ref addVBoxPage ,
+     *        @ref addHBoxPage or @ref addGridPage .
+     */
+    void removePage( QWidget *page );
+
+
+    /**
+     * Returns the index of a page created with @ref addPage ,
+     * @ref addVBoxPage , @ref addHBoxPage or @ref addGridPage .
+     * You can can compare this index with the value returned from
+     * @ref activePageIndex if you need to do some page specific actions
+     * in your code.
+     *
+     * The returned index will never change so you can safely use this
+     * function once and save the value.
+     *
+     * @param widget The widget returned by @ref addPage , @ref addVBoxPage ,
+     *        @ref addHBoxPage or @ref addGridPage .
+     *
+     * @return The index or -1 if the face is not Tabbed, TreeList or
+     *         IconList
+     */
+    virtual int pageIndex( QWidget *widget ) const;
+
+    /**
+     * Defines the widget to be swallowed.
+     *
+     * This method can be used several
+     * times. Only the latest defined widget will be shown.
+     *
+     * @param widget The widget to be swallowed. If 0, then an empty rectangle
+     * is displayed.
+     */
+    virtual bool setSwallowedWidget( QWidget *widget );
+
+    /**
+     * This function has only effect in TreeList mode.
+     *
+     * Defines how the tree list is resized when the widget is resized
+     * horizontally. By default the tree list keeps its width when the
+     * widget becomes wider.
+     *
+     * @param state The resize mode. If false (default) the TreeList keeps
+     *              its current width when the widget becomes wider.
+     */
+    virtual void setTreeListAutoResize( bool state );
+
+    /**
+     * This function has only effect in TreeList mode.
+     *
+     * This tells the widgets whether the icons given in the @ref addPage,
+     * @ref addVBoxPage, @ref addHBoxPage, or @ref addGridPage methods should
+     * be shown in the TreeList.
+     *
+     * Note: This method must be called before calling any of the methods
+     * which add icons to the page.
+     *
+     * @param state If true the icons are shown.
+     **/
+    virtual void setShowIconsInTreeList(bool state);
+
+    /**
+     * This function has only effect in TreeList mode.
+     *
+     * This tells the widgets whether the root should be decorated.
+     * For details see @ref QListView::setRootIsDecorated
+     *
+     * @param state Root will be decorated if true.
+     **/
+    virtual void setRootIsDecorated( bool state );
+
+    /**
+     * This function has only effect in TreeList mode.
+     *
+     * This tells the TreeList to unfold the whole tree so that all entries
+     * are visible.
+     *
+     * If the list is empty when you call this method newly created entries
+     * will not automatically be opened. If the @p persist flag is set opened
+     * entries cannot be closed again, though.
+     *
+     * @param persist If true the tree always stays unfolded.
+     * @since 3.2
+     */
+    /*virtual*/ void unfoldTreeList( bool persist = false ); //### KDE4 BIC add virtual
+
+    /**
+     * This function has only effect in IconList mode.
+     *
+     * Defines how the icon list widget is displayed. By default it is
+     * the widgets in the pages that decide the minimum height
+     * of the toplevel widget. A vertical scrollbar can be used in
+     * the icon list area.
+     *
+     * @param state The visibility mode. If true, the minimum height is
+     *        adjusted so that every icon in the list is visible at the
+     *        same time. The vertical scrollbar will never be visible.
+     */
+    virtual void setIconListAllVisible( bool state );
+
+    /**
+     * Sets the icon used in TreeList Mode for the given path.
+     * @param path The path for which this icon should be shown.
+     * @param pixmap The icon used.
+     **/
+    virtual void setFolderIcon(const QStringList &path, const QPixmap &pixmap);
+    /**
+     * Returns the title string associated with a page index in TreeList or IconList mode.
+     * @param index The index of the page or null if there is no such page.
+     * @see @ref #pageIndex()
+     * @since 3.2
+     */
+    /*virtual*/ QString pageTitle(int index) const;
+    /**
+     * Returns the page widget associated with a page index or null if there is
+     * no such page.
+     * @param index The index of the page.
+     * @see @ref #pageIndex()
+     * @since 3.2
+     */
+    /*virtual*/ QWidget *pageWidget(int index) const;
+
+  signals:
+    void aboutToShowPage(QWidget *page);
+
+  public slots:
+    /**
+     * Give the keyboard input focus to the widget.
+     */
+    virtual void setFocus();
+
+  protected:
+    /**
+     * Reimplemented to handle the splitter width when the the face
+     * is TreeList
+     */
+    virtual void showEvent( QShowEvent * );
+
+    /**
+     * This function is used internally when in IconList mode. If you
+     * reimplement this class a make your own event filter, make sure to
+     * call this function from your filter.
+     *
+     * @param o Object that has received an event.
+     * @param e The event.
+     */
+    virtual bool eventFilter( QObject *o, QEvent *e );
+
+  private slots:
+    bool slotShowPage();
+//US not yet implemented    void slotFontChanged();
+    void slotItemClicked(QListViewItem *it);
+    void pageGone( QObject *obj); // signal from the added page's "destroyed" signal
+    void slotReopen(QListViewItem *item);
+
+  protected:
+    bool showPage( QWidget *w );
+    void addPageWidget( QFrame *page, const QStringList &items,
+                        const QString &header, const QPixmap &pixmap );
+    void InsertTreeListItem(const QStringList &items, const QPixmap &pixmap, QFrame *page);
+    QWidget *FindParent();
+
+  private:
+    bool mValid;
+
+    // Obsolete members. Remove in KDE 4.
+    QPtrList<QWidget> *mPageList;
+    QStringList *mTitleList;
+
+    int          mFace;
+    KListView    *mTreeList;
+    IconListBox  *mIconList;
+    QWidgetStack *mPageStack;
+    QLabel       *mTitleLabel;
+    QTabWidget   *mTabControl;
+    QFrame       *mPlainPage;
+    QWidget      *mSwallowPage;
+    QWidget      *mActivePageWidget;
+    KSeparator   *mTitleSep;
+//US    QSplitter::ResizeMode mTreeListResizeMode;
+    bool         mShowIconsInTreeList;
+    QMap<QListViewItem *, QWidget *> mTreeListToPageStack;
+    QMap<QListBoxItem *, QWidget *> mIconListToPageStack;
+    QMap<QString, QPixmap> mFolderIconMap;
+    QMap<QString, QStringList> mChildrenNames;
+    QMap<QString, QWidget *> mChildPages;
+
+  public:
+    class IconListItem;
+  protected:
+    virtual void virtual_hook( int id, void* data );
+  private:
+    class KJanusWidgetPrivate;
+    KJanusWidgetPrivate *d;
+};
+
+#endif