/*****************************************************************************
 * window_manager.hpp
 *****************************************************************************
 * Copyright (C) 2003 the VideoLAN team
 * $Id$
 *
 * Authors: Cyril Deguet     <asmax@via.ecp.fr>
 *          Olivier Teulière <ipkiss@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#ifndef WINDOW_MANAGER_HPP
#define WINDOW_MANAGER_HPP

#include "skin_common.hpp"
#include "top_window.hpp"
#include "../utils/position.hpp"
#include <list>
#include <map>
#include <set>
#include <utility>


class GenericFont;
class GenericLayout;
class Anchor;
class Tooltip;
class Popup;


/// Window manager for skin windows
class WindowManager: public SkinObject
{
    public:
        /// Direction of the resizing
        enum Direction_t
        {
            kResizeE,   // East
            kResizeSE,  // South-East
            kResizeS,   // South
            kNone       // Reserved for internal use
        };

        /// Constructor
        WindowManager( intf_thread_t *pIntf);

        /// Destructor
        virtual ~WindowManager();

        /**
         * Add a window to the list of known windows. Necessary if you want
         * your window to be movable...
         */
        void registerWindow( TopWindow &rWindow );

        /// Remove a previously registered window
        void unregisterWindow( TopWindow &rWindow );

        /// Tell the window manager that a move is initiated for rWindow
        void startMove( TopWindow &rWindow );

        /// Tell the window manager that the current move ended
        void stopMove();

        /**
         * Move the rWindow window to (left, top), and move all its
         * anchored windows.
         * If a new anchoring is detected, the windows will move accordingly.
         */
        void move( TopWindow &rWindow, int left, int top ) const;

        /// Tell the window manager that a resize is initiated for rLayout
        void startResize( GenericLayout &rLayout, Direction_t direction );

        /// Tell the window manager that the current resizing ended
        void stopResize();

        /**
         * Resize the rLayout layout to (width, height), and move all its
         * anchored windows, if some anchors are moved during the resizing.
         * If a new anchoring is detected, the windows will move (or resize)
         * accordingly.
         */
        void resize( GenericLayout &rLayout, int width, int height ) const;

        /// Maximize the given window
        void maximize( TopWindow &rWindow );

        /// Unmaximize the given window
        void unmaximize( TopWindow &rWindow );

        /// Raise all the registered windows
        void raiseAll() const;

        /// Show all the registered windows
        void showAll( bool firstTime = false ) const;

        /// Hide all the registered windows
        void hideAll() const;

        /// Synchronize the windows with their visibility variable
        void synchVisibility() const;

        /// Save the current visibility of the windows
        void saveVisibility();

        /// Restore the saved visibility of the windows
        void restoreVisibility() const;

        /// Raise the given window
        void raise( TopWindow &rWindow ) const { rWindow.raise(); }

        /// Show the given window
        void show( TopWindow &rWindow ) const { rWindow.show(); }

        /// Hide the given window
        void hide( TopWindow &rWindow ) const { rWindow.hide(); }

        /// Toggle all the windows on top
        void toggleOnTop();

        /// Set the magnetism of screen edges
        void setMagnetValue( int magnet ) { m_magnet = magnet; }

        /// Set the alpha value of the static windows
        void setAlphaValue( int alpha ) { m_alpha = alpha; }

        /// Set the alpha value of the moving windows
        void setMoveAlphaValue( int moveAlpha ) { m_moveAlpha = moveAlpha; }

        /// Create the tooltip window
        void createTooltip( const GenericFont &rTipFont );

        /// Show the tooltip window
        void showTooltip();

        /// Hide the tooltip window
        void hideTooltip();

        /// Add a layout of the given window. This new layout will be the
        /// active one.
        void addLayout( TopWindow &rWindow, GenericLayout &rLayout );

        /// Change the active layout of the given window
        void setActiveLayout( TopWindow &rWindow, GenericLayout &rLayout );

        /// Mark the given popup as active
        void setActivePopup( Popup &rPopup ) { m_pPopup = &rPopup; }

        /// Return the active popup, or NULL if none is active
        Popup * getActivePopup() const { return m_pPopup; }

    private:
        /// Some useful typedefs for lazy people like me
        typedef set<TopWindow*> WinSet_t;
        typedef list<Anchor*> AncList_t;

        /// Dependencies map
        /**
         * This map represents the graph of anchored windows: it associates
         * to a given window all the windows that are directly anchored by it.
         * This is not transitive, i.e. if a is in m_dep[b] and if b is in
         * m_dep[c], it doesn't mean that a is in m_dep[c] (in fact, it
         * would be extremely rare...)
         */
        map<TopWindow*, WinSet_t> m_dependencies;
        /// Store all the windows
        WinSet_t m_allWindows;
        /**
         * Store the windows that were visible when saveVisibility() was
         * last called.
         */
        WinSet_t m_savedWindows;
        /// Store the moving windows
        /**
         * This set is updated at every start of move.
         */
        WinSet_t m_movingWindows;
        /**
         * Store the moving windows in the context of resizing
         * These sets are updated at every start of move
         */
        //@{
        WinSet_t m_resizeMovingE;
        WinSet_t m_resizeMovingS;
        WinSet_t m_resizeMovingSE;
        //@}
        /// Indicate whether the windows are currently on top
        VariablePtr m_cVarOnTop;
        /// Magnetism of the screen edges (= scope of action)
        int m_magnet;
        /// Alpha value of the static windows
        int m_alpha;
        /// Alpha value of the moving windows
        int m_moveAlpha;
        /// Direction of the current resizing
        Direction_t m_direction;
        /// Rect of the last maximized window
        Rect m_maximizeRect;
        /// Tooltip
        Tooltip *m_pTooltip;
        /// Active popup, if any
        Popup *m_pPopup;

        /// Recursively build a set of windows anchored to the one given.
        void buildDependSet( WinSet_t &rWinSet, TopWindow *pWindow );

        /// Check anchoring
        /**
         * This function updates xOffset and yOffset, to take care of a new
         * anchoring (if any)
         */
        void checkAnchors( TopWindow *pWindow,
                           int &xOffset, int &yOffset ) const;
};


#endif
