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focushandler.hpp

/*      _______   __   __   __   ______   __   __   _______   __   __
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 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
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#ifndef GCN_FOCUSHANDLER_HPP
#define GCN_FOCUSHANDLER_HPP

#include <vector>

#include "guichan/platform.hpp"

namespace gcn
{
    class Widget;

    /**
     * Used to keep track of widget focus. You will probably not have
     * to use the FocusHandler directly to handle focus. Widget has
     * functions for handling focus which uses a FocusHandler. Use them
     * instead.
     *
     * @see Widget::isFocused
     * @see Widget::requestFocus
     * @see Widget::setFocusable
     * @see Widget::isFocusable
     * @see Widget::gotFocus
     * @see Widget::lostFocus
     */
00081     class GCN_CORE_DECLSPEC FocusHandler
    {
    public:

        /**
         * Constructor.
         */
        FocusHandler();

        /**
         * Destructor.
         */
00093         virtual ~FocusHandler() { };

        /**
         * Sets focus to a widget. Widget::lostFocus and
         * Widget::gotFocus will be called.
         *
         * @param widget the widget to focus.
         */
        virtual void requestFocus(Widget* widget);

        /**
         * Sets modal focus to a widget.
         *
         * @param widget the Widget to focus modal.
         * @throws Exception when another widget already has modal focus.
         */
        virtual void requestModalFocus(Widget* widget);

        /**
         * Releases modal focus if the widget has modal focus.
         * Otherwise nothing will be done.
         *
         * @param widget the Widget to release modal focus for.
         */
        virtual void releaseModalFocus(Widget* widget);

        /**
         * Sets modal mouse input focus to a widget. Modal mouse input focus means
         * no other widget then the widget with modal mouse input focus will
         * receive mouse input..
         * The widget with modal mouse input focus will also receive mouse input no
         * matter what the mouse input is or where the mouse input occurs.
         *
         * @param widget the widget to focus for modal mouse input focus.
         * @throws Exception when another widget already has modal mouse input focus.
         */
        virtual void requestModalMouseInputFocus(Widget* widget);

        /**
         * Releases modal mouse input focus if the widget has modal mouse input
         * focus. Otherwise nothing will be done.
         *
         * @param widget the widget to release modal mouse input focus for.
         */
        virtual void releaseModalMouseInputFocus(Widget* widget);

        /**
         * Gets the widget with focus.
         *
         * @return the Widget with focus. NULL will be returned if
         *         no Widget has focus.
         */
        virtual Widget* getFocused() const;

        /**
         * Gets the widget with modal focus.
         *
         * @return the Widget with modal focus. NULL will be returned
         *         if no Widget has modal focus.
         */
        virtual Widget* getModalFocused() const;

        /**
         * Gets the widget with modal mouse input focus.
         *
         * @return the widget with modal mouse input focus. NULL will be returned
         *         if no widget has modal mouse input focus.
         */
        virtual Widget* getModalMouseInputFocused() const;

        /**
         * Focuses the next Widget. If no Widget has focus the first
         * Widget gets focus. The order in which the Widgets are focused
         * depends on the order you add them to the GUI.
         */
        virtual void focusNext();

        /**
         * Focuses the previous Widget. If no Widget has focus the first
         * Widget gets focus. The order in which the widgets are focused
         * depends on the order you add them to the GUI.
         */
        virtual void focusPrevious();

        /**
         * Checks if a Widget is focused.
         *
         * @param widget widget to check if it is focused.
         * @return true if the widget is focused.
         */
        virtual bool isFocused(const Widget* widget) const;

        /**
         * Adds a widget to the FocusHandler.
         *
         * @param widget the widget to add.
         */
        virtual void add(Widget* widget);

        /**
         * Removes a widget from the FocusHandler.
         *
         * @param widget the widget to remove.
         */
        virtual void remove(Widget* widget);

        /**
         * Focuses nothing.
         */
        virtual void focusNone();

        /**
         * Focuses the next Widget which allows tab in unless current focused
         * Widget disallows tab out.
         */
        virtual void tabNext();

        /**
         * Focuses the previous Widget which allows tab in unless current focused
         * Widget disallows tab out.
         */
        virtual void tabPrevious();

        /**
         * Applies the changes.
         */
        virtual void applyChanges();

    protected:
        typedef std::vector<Widget*> WidgetVector;
        typedef WidgetVector::iterator WidgetIterator;
        WidgetVector mWidgets;

        Widget* mFocusedWidget;
        Widget* mToBeFocused;
        Widget* mModalFocusedWidget;
        Widget* mModalMouseInputFocusedWidget;
    };
}

#endif // end GCN_FOCUSHANDLER_HPP

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