/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_COMPHELPER_ACCESSIBLECOMPONENTHELPER_HXX
#define INCLUDED_COMPHELPER_ACCESSIBLECOMPONENTHELPER_HXX

#include <com/sun/star/accessibility/XAccessibleComponent.hpp>
#include <com/sun/star/accessibility/XAccessibleContext2.hpp>
#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp>
#include <com/sun/star/accessibility/XAccessibleExtendedComponent.hpp>
#include <comphelper/accessibleeventnotifier.hxx>
#include <cppuhelper/basemutex.hxx>
#include <cppuhelper/compbase.hxx>
#include <cppuhelper/implbase.hxx>
#include <comphelper/comphelperdllapi.h>


namespace comphelper
{


    //= OCommonAccessibleComponent

    typedef ::cppu::WeakComponentImplHelper <   css::accessibility::XAccessibleContext2,
                                                css::accessibility::XAccessibleEventBroadcaster
                                            >   OCommonAccessibleComponent_Base;

    /** base class encapsulating common functionality for the helper classes implementing
        the XAccessibleComponent respectively XAccessibleExtendendComponent
    */
    class COMPHELPER_DLLPUBLIC OCommonAccessibleComponent
                :public ::cppu::BaseMutex
                ,public OCommonAccessibleComponent_Base
    {
        friend class OContextEntryGuard;
    private:
        css::uno::WeakReference< css::accessibility::XAccessible > m_aCreator;         // the XAccessible which created our XAccessibleContext
        AccessibleEventNotifier::TClientId m_nClientId;

    protected:
        virtual ~OCommonAccessibleComponent( ) override;

        OCommonAccessibleComponent( );

        /** late construction
        @param _rxAccessible
            the Accessible object which created this context.
            <p>If your derived implementation implements the XAccessible (and does not follow the proposed
            separation of XAccessible from XAccessibleContext), you may pass <code>this</code> here.</p>

            <p>The object is hold weak, so its life time is not affected.</p>

            <p>The object is needed for performance reasons: for <method>getAccessibleIndexInParent</method>,
            all children (which are XAccessible's theirself) of our parent have to be asked. If we know our
            XAccessible, we can compare it with all the children, instead of asking all children for their
            context and comparing this context with ourself.</p>
        */
        void    lateInit( const css::uno::Reference< css::accessibility::XAccessible >& _rxAccessible );

        /** retrieves the creator previously set with <method>lateInit</method>
        */
        css::uno::Reference< css::accessibility::XAccessible >
                getAccessibleCreator( ) const;

    public:
        // XAccessibleEventBroadcaster
        virtual void SAL_CALL addAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override final;
        virtual void SAL_CALL removeAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override final;

        // XAccessibleContext - still waiting to be overwritten
        virtual sal_Int64 SAL_CALL getAccessibleChildCount(  ) override = 0;
        virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleChild( sal_Int64 i ) override = 0;
        virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleParent(  ) override = 0;
        virtual sal_Int16 SAL_CALL getAccessibleRole(  ) override = 0;
        virtual OUString SAL_CALL getAccessibleDescription(  ) override = 0;
        virtual OUString SAL_CALL getAccessibleName(  ) override = 0;
        virtual css::uno::Reference< css::accessibility::XAccessibleRelationSet > SAL_CALL getAccessibleRelationSet(  ) override = 0;
        virtual sal_Int64 SAL_CALL getAccessibleStateSet(  ) override = 0;

        // XAccessibleContext2 - default implementation
        virtual OUString SAL_CALL getAccessibleId(  ) override;

        // XAccessibleContext - default implementations
        /** default implementation for retrieving the index of this object within the parent
            <p>This basic implementation here returns the index <code>i</code> of the child for which
                <code>&lt;parent&gt;.getAccessibleChild( i )</code> equals our creator.</p>
        */
        virtual sal_Int64 SAL_CALL getAccessibleIndexInParent(  ) override;
        /** default implementation for retrieving the locale
            <p>This basic implementation returns the locale of the parent context,
            as retrieved via getAccessibleParent()->getAccessibleContext.</p>
        */
        virtual css::lang::Locale SAL_CALL getLocale(  ) override;

    protected:
        // OComponentHelper
        virtual void SAL_CALL disposing() override;

    protected:
        // helper
        /** notifies all AccessibleEventListeners of a certain event

        @precond    not to be called with our mutex locked
        @param  _nEventId
            the id of the event. See AccessibleEventType
        @param  _rOldValue
            the old value to be notified
        @param  _rNewValue
            the new value to be notified
        */
        void NotifyAccessibleEvent(
                    const sal_Int16 _nEventId,
                    const css::uno::Any& _rOldValue,
                    const css::uno::Any& _rNewValue,
                    sal_Int32 nIndexHint = -1
                );

        // life time control
        /// checks whether the object is alive (returns <TRUE/> then) or disposed
        bool    isAlive() const;
        /// checks for being alive. If the object is already disposed (i.e. not alive), an exception is thrown.
        void        ensureAlive() const;

        /** ensures that the object is disposed.
        @precond
            to be called from within the destructor of your derived class only!
        */
        void        ensureDisposed( );

        /** shortcut for retrieving the context of the parent (returned by getAccessibleParent)
        */
        css::uno::Reference< css::accessibility::XAccessibleContext >
                    implGetParentContext();

        // access to the base class' broadcast helper/mutex
        ::osl::Mutex&                   GetMutex()                  { return m_aMutex; }

    protected:
        /// implements the calculation of the bounding rectangle - still waiting to be overwritten
        ///
        /// @throws css::uno::RuntimeException
        virtual css::awt::Rectangle implGetBounds(  ) = 0;

    protected:
        /** non-virtual versions of the methods which can be implemented using <method>implGetBounds</method>
            note: getLocationOnScreen relies on a valid parent (XAccessibleContext::getParent()->getAccessibleContext()),
                 which itself implements XAccessibleComponent

            @throws css::uno::RuntimeException
        */
        bool containsPoint( const css::awt::Point& aPoint );
        /// @throws css::uno::RuntimeException
        css::awt::Point getLocation(  );
        /// @throws css::uno::RuntimeException
        css::awt::Point getLocationOnScreen(  );
        /// @throws css::uno::RuntimeException
        css::awt::Size getSize(  );
        /// @throws css::uno::RuntimeException
        css::awt::Rectangle getBounds(  );
    };


    //= OAccessibleComponentHelper


    /** a helper class for implementing an AccessibleContext which at the same time
        supports an XAccessibleComponent interface.
    */
    class COMPHELPER_DLLPUBLIC OAccessibleComponentHelper
            :public cppu::ImplInheritanceHelper<
                 OCommonAccessibleComponent, css::accessibility::XAccessibleComponent>
    {
    private:
        OAccessibleComponentHelper(OAccessibleComponentHelper const &) = delete;
        OAccessibleComponentHelper(OAccessibleComponentHelper &&) = delete;
        void operator =(OAccessibleComponentHelper const &) = delete;
        void operator =(OAccessibleComponentHelper &&) = delete;

    protected:
        OAccessibleComponentHelper();

    public:
        // XAccessibleComponent - default implementations
        virtual sal_Bool SAL_CALL containsPoint( const css::awt::Point& aPoint ) override final;
        virtual css::awt::Point SAL_CALL getLocation(  ) override final;
        virtual css::awt::Point SAL_CALL getLocationOnScreen(  ) override;
        virtual css::awt::Size SAL_CALL getSize(  ) override final;
        virtual css::awt::Rectangle SAL_CALL getBounds(  ) override final;
    };


    //= OAccessibleExtendedComponentHelper


    /** a helper class for implementing an AccessibleContext which at the same time
        supports an XAccessibleExtendedComponent interface.
    */
    class COMPHELPER_DLLPUBLIC OAccessibleExtendedComponentHelper
            :public cppu::ImplInheritanceHelper<
                 OCommonAccessibleComponent, css::accessibility::XAccessibleExtendedComponent>
    {
    private:
        OAccessibleExtendedComponentHelper(OAccessibleExtendedComponentHelper const &) = delete;
        OAccessibleExtendedComponentHelper(OAccessibleExtendedComponentHelper &&) = delete;
        void operator =(OAccessibleExtendedComponentHelper const &) = delete;
        void operator =(OAccessibleExtendedComponentHelper &&) = delete;

    protected:
        OAccessibleExtendedComponentHelper( );

    public:
        // XAccessibleComponent - default implementations
        virtual sal_Bool SAL_CALL containsPoint( const css::awt::Point& aPoint ) override final;
        virtual css::awt::Point SAL_CALL getLocation(  ) override;
        virtual css::awt::Point SAL_CALL getLocationOnScreen(  ) override;
        virtual css::awt::Size SAL_CALL getSize(  ) override;
        virtual css::awt::Rectangle SAL_CALL getBounds(  ) override;
    };


}   // namespace comphelper


#endif // INCLUDED_COMPHELPER_ACCESSIBLECOMPONENTHELPER_HXX


/* vim:set shiftwidth=4 softtabstop=4 expandtab: */