# Source: partmanager.h |
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    /* This file is part of the KDE project
       Copyright (C) 1999 Simon Hausmann <hausmann@kde.org>
                 (C) 1999 David Faure <faure@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 __kpartmanager_h__
    #define __kpartmanager_h__

    #include <qobject.h>
    #include <qwidget.h>
    #include <qlist.h>

    class KInstance;

    namespace KParts
    {

    class Part;

    class PartManagerPrivate;

    /**
     * The part manager is an object which knows about a collection of parts
     * (even nested ones) and handles activation/deactivation.
     *
     * Applications that want to embed parts without merging GUIs
     * only use a @ref KPartManager. Those who want to merge GUIs use a
     * @ref KPartsMainWindow for example, in addition to a part manager.
     *
     * Parts know about the part manager to add nested parts to it.
     * See also @ref KParts::Part::manager() and @ref KParts::Part::setManager().
     */
    class PartManager : public QObject
    {
      Q_OBJECT
      Q_ENUMS( SelectionPolicy )
      Q_PROPERTY( SelectionPolicy selectionPolicy READ selectionPolicy WRITE setSelectionPolicy )
      Q_PROPERTY( bool allowNestedParts READ allowNestedParts WRITE setAllowNestedParts )
      Q_PROPERTY( bool ignoreScrollBars READ ignoreScrollBars WRITE setIgnoreScrollBars )
    public:
      // the default policy of a PartManager is Direct!
      enum SelectionPolicy { Direct, TriState };

      /**
       * Create a part manager.
       *
       * @param parent The toplevel widget (window / dialog) the
       *               partmanager should monitor for activation/selection
       *               events
       */
      PartManager( QWidget * parent, const char * name = 0L );
      /**
       * Create a part manager.
       *
       * @param topLevel The toplevel widget (window / dialog ) the
       *                 partmanager should monitor for activation/selection
       *                 events
       * @param parent The parent QObject.
       */
      PartManager( QWidget * topLevel, QObject *parent, const char *name = 0 );
      virtual ~PartManager();

      /**
       * Set the selection policy of the partmanager.
       */
      void setSelectionPolicy( SelectionPolicy policy );
      /**
       * Retrieve the current selection policy.
       */
      SelectionPolicy selectionPolicy() const;

      /**
       * Specify whether the partmanager should handle/allow nested parts
       * or not.
       *
       *  This is a property the shell has to set/specify. Per
       * default we assume that the shell cannot handle nested
       * parts. However in case of a KOffice shell for example we allow
       * nested parts.  A Part is nested (a child part) if its parent
       * object inherits @ref KParts::Part.  If a child part is activated and
       * nested parts are not allowed/handled, then the top parent part in
       * the tree is activated.
       */
      void setAllowNestedParts( bool allow );
      /**
       * @see setAllowNestedParts
       */
      bool allowNestedParts() const;

      /**
       * Specify whether the partmanager should ignore mouse click events for
       * scrollbars or not. If the partmanager ignores them, then clicking on the
       * scrollbars of a non-active/non-selected part will not change the selection
       * or activation state.
       *
       * The default value is false (read: scrollbars are NOT ignored).
       */
      void setIgnoreScrollBars( bool ignore );
      /**
       * @see setIgnoreScrollBars
       */
      bool ignoreScrollBars() const;

      /**
       * @internal
       */
      virtual bool eventFilter( QObject *obj, QEvent *ev );

      /**
       * Add a Part to the manager.
       *
       * Sets it to the active part automatically if @p setActive is true (default ).
       */
      virtual void addPart( Part *part, bool setActive = true );

      /**
       * Remove a part from the manager (this does not delete the object) .
       *
       * Sets the active part to 0 if @p part is the @ref activePart() .
       */
      virtual void removePart( Part *part );

      /**
       * Replaces @p oldPart with @p newPart, and sets @p newPart as active if
       * @p setActive is true.
       * This is an optimised version of @ref removePart + @ref addPart
       */
      virtual void replacePart( Part * oldPart, Part * newPart, bool setActive = true );

      /**
       * Set the active part.
       *
       * The active part receives activation events.
       *
       * @p widget can be used to specify which widget was responsible for the activation.
       * This is important if you have multiple views for a document/part , like in KOffice .
       */
      virtual void setActivePart( Part *part, QWidget *widget = 0L );

      /**
       * Retrieve the active part.
       **/
      virtual Part *activePart() const;

      /**
       * Retrieve the active widget of the current active part (see @ref activePart ).
       */
      virtual QWidget *activeWidget() const;

      /**
       * Set the selected part.
       *
       * The selected part receives selection events.
       *
       * @p widget can be used to specify which widget was responsible for the selection.
       * This is important if you have multiple views for a document/part , like in KOffice .
       */
      virtual void setSelectedPart( Part *part, QWidget *widget = 0L );

      /**
       * Retrieve the current selected part.
       */
      virtual Part *selectedPart() const;

      /**
       * Retrieve the selected widget of the current selected part (see @ref selectedPart ).
       */
      virtual QWidget *selectedWidget() const;

      /**
       * Retrieve the list of parts being managed by the partmanager.
       */
      const QList<Part> *parts() const;

      /**
       * Adds the @p topLevel widget to the list of managed toplevel widgets.
       * Usually a PartManager only listens for events (for activation/selection)
       * for one toplevel widget (and its children) , the one specified in the
       * constructor. Sometimes however (like for example when using the KDE dockwidget
       * library) , it is necessary to extend this.
       */
      void addManagedTopLevelWidget( const QWidget *topLevel );
      /**
       * Removes the @p topLevel widget from the list of managed toplevel widgets.
       * @see addManagedTopLevelWidget
       */
      void removeManagedTopLevelWidget( const QWidget *topLevel );

    signals:
      /**
       * Emitted when a new part has been added.
       * @see addPart()
       **/
      void partAdded( KParts::Part *part );
      /**
       * Emitted when a part has been removed.
       * @see removePart()
       **/
      void partRemoved( KParts::Part *part );
      /**
       * Emitted when the active part has changed.
       * @see setActivePart()
       **/
      void activePartChanged( KParts::Part *newPart );

    protected:
      /**
       * Changes the active instance when the active part changes.
       * The active instance is used by KBugReport and KAboutDialog.
       * Override if you really need to - usually you don't need to.
       */
      virtual void setActiveInstance( KInstance * instance );

    protected slots:
      /**
       * Removes a part when it is destroyed.
       **/
      void slotObjectDestroyed();

      /**
       * @internal
       */
      void slotWidgetDestroyed();

      /**
       * @internal
       */
      void slotManagedTopLevelWidgetDestroyed();
    private:
      Part * findPartFromWidget( QWidget * widget, const QPoint &pos );
      Part * findPartFromWidget( QWidget * widget );

      PartManagerPrivate *d;
    };

    };

    #endif

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