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+/*      _______   __   __   __   ______   __   __   _______   __   __
+ *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
+ *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
+ *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
+ *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
+ * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
+ * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
+ *
+ * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
+ *
+ *
+ * Per Larsson a.k.a finalman
+ * Olof Naessén a.k.a jansem/yakslem
+ *
+ * Visit: http://guichan.sourceforge.net
+ *
+ * License: (BSD)
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name of Guichan nor the names of its contributors may
+ *    be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GCN_GUI_HPP
+#define GCN_GUI_HPP
+
+#include <list>
+#include <deque>
+
+#include "guichan/keyevent.hpp"
+#include "guichan/mouseevent.hpp"
+#include "guichan/mouseinput.hpp"
+#include "guichan/platform.hpp"
+
+namespace gcn
+{
+    class FocusHandler;
+    class Graphics;
+    class Input;
+    class KeyListener;
+    class Widget;
+
+    // The following comment will appear in the doxygen main page.
+    /**
+     * @mainpage
+     * @section Introduction
+     * This documentation is mostly intended as a reference to the API. If you want to get started with Guichan, we suggest you check out the programs in the examples directory of the Guichan release.
+     * @n
+     * @n
+     * This documentation is, and will always be, work in progress. If you find any errors, typos or inconsistencies, or if you feel something needs to be explained in more detail - don't hesitate to tell us.
+     */
+
+    /**
+     * Contains a Guichan GUI. This is the core class of Guichan to which
+     * implementations of back ends are passed, to make Guichan work with
+     * a specific library, and to where the top widget (root widget of GUI)
+     * is added. If you want to be able to have more then one widget in your 
+     * GUI, the top widget should be a container.
+     *
+     * A Gui object cannot work properly without passing back end 
+     * implementations to it. A Gui object must have an implementation of a
+     * Graphics and an implementation of Input. 
+     *
+     * NOTE: A complete GUI also must have the ability to load images.
+     *       Images are loaded with the Image class, so to make Guichan
+     *       able to load images an implementation of ImageLoader must be
+     *       passed to Image.
+     *
+     * @see Graphics, Input, Image
+     */
+    class GCN_CORE_DECLSPEC Gui
+    {
+    public:
+
+        /**
+         * Constructor.
+         */
+        Gui();
+
+        /**
+         * Destructor.
+         */
+        virtual ~Gui();
+
+        /**
+         * Sets the top widget. The top widget is the root widget
+         * of the GUI. If you want a GUI to be able to contain more
+         * than one widget the top widget should be a container.
+         *
+         * @param top The top widget.
+         * @see Container
+         * @since 0.1.0
+         */
+        virtual void setTop(Widget* top);
+
+        /**
+         * Gets the top widget. The top widget is the root widget
+         * of the GUI.
+         *
+         * @return The top widget. NULL if no top widget has been set.
+         * @since 0.1.0
+         */
+        virtual Widget* getTop() const;
+
+        /**
+         * Sets the graphics object to use for drawing.
+         *
+         * @param graphics The graphics object to use for drawing.
+         * @see getGraphics, AllegroGraphics, HGEGraphics, 
+         *      OpenLayerGraphics, OpenGLGraphics, SDLGraphics
+         * @since 0.1.0
+         */
+        virtual void setGraphics(Graphics* graphics);
+
+        /**
+         * Gets the graphics object used for drawing.
+         *
+         *  @return The graphics object used for drawing. NULL if no
+         *          graphics object has been set.
+         * @see setGraphics, AllegroGraphics, HGEGraphics, 
+         *      OpenLayerGraphics, OpenGLGraphics, SDLGraphics
+         * @since 0.1.0
+         */
+        virtual Graphics* getGraphics() const;
+
+        /**
+         * Sets the input object to use for input handling.
+         *
+         * @param input The input object to use for input handling.
+         * @see getInput, AllegroInput, HGEInput, OpenLayerInput,
+         *      SDLInput
+         * @since 0.1.0
+         */
+        virtual void setInput(Input* input);
+
+        /**
+         * Gets the input object being used for input handling.
+         *
+         *  @return The input object used for handling input. NULL if no
+         *          input object has been set.
+         * @see setInput, AllegroInput, HGEInput, OpenLayerInput,
+         *      SDLInput
+         * @since 0.1.0
+         */
+        virtual Input* getInput() const;
+
+        /**
+         * Performs logic of the GUI. By calling this function all logic
+         * functions down in the GUI heirarchy will be called. When logic
+         * is called for Gui, user input will be handled.
+         *
+         * @see Widget::logic
+         * @since 0.1.0
+         */
+        virtual void logic();
+
+        /**
+         * Draws the GUI. By calling this funcion all draw functions
+         * down in the GUI hierarchy will be called. When draw is called
+         * the used Graphics object will be initialised and drawing of
+         * the top widget will commence.
+         *
+         * @see Widget::draw
+         * @since 0.1.0
+         */
+        virtual void draw();
+
+        /**
+         * Focuses none of the widgets in the Gui.
+         *
+         * @since 0.1.0
+         */
+        virtual void focusNone();
+
+        /**
+         * Sets tabbing enabled, or not. Tabbing is the usage of
+         * changing focus by utilising the tab key.
+         *
+         * @param tabbing True if tabbing should be enabled, false
+         *                otherwise.
+         * @see isTabbingEnabled
+         * @since 0.1.0
+         */
+        virtual void setTabbingEnabled(bool tabbing);
+
+        /**
+         * Checks if tabbing is enabled.
+         *
+         * @return True if tabbing is enabled, false otherwise.
+         * @see setTabbingEnabled
+         * @since 0.1.0
+         */
+        virtual bool isTabbingEnabled();
+
+        /**
+         * Adds a global key listener to the Gui. A global key listener
+         * will receive all key events generated from the GUI and global
+         * key listeners will receive the events before key listeners
+         * of widgets.
+         *
+         * @param keyListener The key listener to add.
+         * @see removeGlobalKeyListener
+         * @since 0.5.0
+         */
+        virtual void addGlobalKeyListener(KeyListener* keyListener);
+
+        /**
+         * Removes global key listener from the Gui.
+         *
+         * @param keyListener The key listener to remove.
+         * @throws Exception if the key listener hasn't been added.
+         * @see addGlobalKeyListener
+         * @since 0.5.0
+         */
+        virtual void removeGlobalKeyListener(KeyListener* keyListener);
+
+    protected:
+        /**
+         * Handles all mouse input.
+         *
+         * @since 0.6.0
+         */
+        virtual void handleMouseInput();
+
+        /**
+         * Handles key input.
+         *
+         * @since 0.6.0
+         */
+        virtual void handleKeyInput();
+
+        /**
+         * Handles mouse moved input.
+         *
+         * @param mouseInput The mouse input to handle.
+         * @since 0.6.0
+         */
+        virtual void handleMouseMoved(const MouseInput& mouseInput);
+
+        /**
+         * Handles mouse pressed input.
+         *
+         * @param mouseInput The mouse input to handle.
+         * @since 0.6.0
+         */
+        virtual void handleMousePressed(const MouseInput& mouseInput);
+
+        /**
+         *
+         * Handles mouse wheel moved down input.
+         *
+         * @param mouseInput The mouse input to handle.
+         * @since 0.6.0
+         */
+        virtual void handleMouseWheelMovedDown(const MouseInput& mouseInput);
+
+        /**
+         * Handles mouse wheel moved up input.
+         *
+         * @param mouseInput The mouse input to handle.
+         * @since 0.6.0
+         */
+        virtual void handleMouseWheelMovedUp(const MouseInput& mouseInput);
+
+        /**
+         * Handles mouse released input.
+         *
+         * @param mouseInput The mouse input to handle.
+         * @since 0.6.0
+         */
+        virtual void handleMouseReleased(const MouseInput& mouseInput);
+
+        /**
+         * Handles modal focus. Modal focus needs to be checked at 
+         * each logic iteration as it might be necessary to distribute
+         * mouse entered or mouse exited events.
+         *
+         * @since 0.8.0
+         */
+        virtual void handleModalFocus();
+
+        /**
+         * Handles modal mouse input focus. Modal mouse input focus needs 
+         * to be checked at each logic iteration as it might be necessary to 
+         * distribute mouse entered or mouse exited events.
+         *
+         * @since 0.8.0
+         */
+        virtual void handleModalMouseInputFocus();
+
+        /**
+         * Handles modal focus gained. If modal focus has been gained it might
+         * be necessary to distribute mouse entered or mouse exited events.
+         *
+         * @since 0.8.0
+         */
+        virtual void handleModalFocusGained();
+
+        /**
+         * Handles modal mouse input focus gained. If modal focus has been
+         * gained it might be necessary to distribute mouse entered or mouse
+         * exited events.
+         *
+         * @since 0.8.0
+         */
+        virtual void handleModalFocusReleased();
+
+        /**
+         * Distributes a mouse event.
+         *
+         * @param type The type of the event to distribute,
+         * @param button The button of the event (if any used) to distribute.
+         * @param x The x coordinate of the event.
+         * @param y The y coordinate of the event.
+         * @param fource indicates whether the distribution should be forced or not.
+         *               A forced distribution distributes the event even if a widget
+         *               is not enabled, not visible, another widget has modal
+         *               focus or another widget has modal mouse input focus. 
+         *               Default value is false.
+         * @param toSourceOnly indicates whether the distribution should be to the
+         *                     source widget only or to it's parent's mouse listeners
+         *                     as well.
+         *
+         * @since 0.6.0
+         */
+        virtual void distributeMouseEvent(Widget* source,
+                                          int type,
+                                          int button,
+                                          int x,
+                                          int y,
+                                          bool force = false,
+                                          bool toSourceOnly = false);
+
+        /**
+         * Distributes a key event.
+         *
+         * @param keyEvent The key event to distribute.
+
+         * @since 0.6.0
+         */
+        virtual void distributeKeyEvent(KeyEvent& keyEvent);
+
+        /**
+         * Distributes a key event to the global key listeners.
+         *
+         * @param keyEvent The key event to distribute.
+         *
+         * @since 0.6.0
+         */
+        virtual void distributeKeyEventToGlobalKeyListeners(KeyEvent& keyEvent);
+
+        /**
+         * Gets the widget at a certain position.
+         *
+         * @return The widget at a certain position.
+         * @since 0.6.0
+         */
+        virtual Widget* getWidgetAt(int x, int y);
+
+        /**
+         * Gets the source of the mouse event.
+         *
+         * @return The source widget of the mouse event.
+         * @since 0.6.0
+         */
+        virtual Widget* getMouseEventSource(int x, int y);
+
+        /**
+         * Gets the source of the key event.
+         *
+         * @return The source widget of the key event.
+         * @since 0.6.0
+         */
+        virtual Widget* getKeyEventSource();
+
+        /**
+         * Holds the top widget.
+         */
+        Widget* mTop;
+
+        /**
+         * Holds the graphics implementation used.
+         */
+        Graphics* mGraphics;
+
+        /**
+         * Holds the input implementation used.
+         */
+        Input* mInput;
+
+        /**
+         * Holds the focus handler for the Gui.
+         */
+        FocusHandler* mFocusHandler;
+
+        /**
+         * True if tabbing is enabled, false otherwise.
+         */
+        bool mTabbing;
+
+        /**
+         * Typedef.
+         */
+        typedef std::list<KeyListener*> KeyListenerList;
+
+        /**
+         * Typedef.
+         */
+        typedef KeyListenerList::iterator KeyListenerListIterator;
+
+        /**
+         * Holds the global key listeners of the Gui.
+         */
+        KeyListenerList mKeyListeners;
+        
+        /**
+         * True if shift is pressed, false otherwise.
+         */
+        bool mShiftPressed;
+
+        /**
+         * True if meta is pressed, false otherwise.
+         */
+        bool mMetaPressed;
+
+        /**
+         * True if control is pressed, false otherwise.
+         */
+        bool mControlPressed;
+
+        /**
+         * True if alt is pressed, false otherwise.
+         */
+        bool mAltPressed;
+
+        /**
+         * Holds the last mouse button pressed.
+         */
+        unsigned int mLastMousePressButton;
+
+        /**
+         * Holds the last mouse press time stamp.
+         */
+        int mLastMousePressTimeStamp;
+
+        /**
+         * Holds the last mouse x coordinate.
+         */
+        int mLastMouseX;
+
+        /**
+         * Holds the last mouse y coordinate.
+         */
+        int mLastMouseY;
+
+        /**
+         * Holds the current click count. Used to keep track
+         * of clicks for a the last pressed button.
+         */
+        int mClickCount;
+
+        /**
+         * Holds the last button used when a drag of a widget
+         * was initiated. Used to be able to release a drag
+         * when the same button is released.
+         */
+        int mLastMouseDragButton;
+
+        /**
+         * Holds a stack with all the widgets with the mouse.
+         * Used to properly distribute mouse events.
+         */
+        std::deque<Widget*> mWidgetWithMouseQueue;
+    };
+}
+
+#endif // end GCN_GUI_HPP
+
+/* yakslem  - "Women, it's a constant struggle."
+ * finalman - "Yes, but sometimes they succeed with their guesses."
+ * yaklsem  - "...eh...I was talking about love."
+ * finalman - "Oh...ok..."
+ * An awkward silence followed.
+ */