/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_forms.hxx"
#include "windowstateguard.hxx"
#include "frm_strings.hxx"

/** === begin UNO includes === **/
#include <com/sun/star/awt/XWindowListener2.hpp>
#include <com/sun/star/beans/XPropertySet.hpp>
/** === end UNO includes === **/
#include <cppuhelper/implbase1.hxx>
#include <tools/diagnose_ex.h>

//........................................................................
namespace frm
{
//........................................................................

	/** === begin UNO using === **/
    using ::com::sun::star::awt::XWindowListener2;
    using ::com::sun::star::uno::Reference;
    using ::com::sun::star::awt::XWindow2;
    using ::com::sun::star::awt::WindowEvent;
    using ::com::sun::star::uno::RuntimeException;
    using ::com::sun::star::awt::XControlModel;
    using ::com::sun::star::beans::XPropertySet;
    using ::com::sun::star::lang::EventObject;
    using ::com::sun::star::uno::RuntimeException;
    using ::com::sun::star::uno::UNO_QUERY;
    using ::com::sun::star::uno::Exception;
	/** === end UNO using === **/

	//====================================================================
	//= WindowStateGuard_Impl
	//====================================================================
    typedef ::cppu::WeakImplHelper1 <   XWindowListener2
                                    >   WindowStateGuard_Impl_Base;
    class WindowStateGuard_Impl : public WindowStateGuard_Impl_Base
    {
    private:
        ::osl::Mutex                m_aMutex;
        Reference< XWindow2 >       m_xWindow;
        Reference< XPropertySet >   m_xModelProps;

    public:
        /** constructs the instance
            @param _rxWindow
                the window at which to listen. Must not be <NULL/>.
            @param _rxModel
                the model which acts as the reference for the states to be enforced. Must not be <NULL/>.
        */
        WindowStateGuard_Impl( const Reference< XWindow2 >& _rxWindow, const Reference< XPropertySet >& _rxMdelProps );

        void dispose();

    protected:
        // XWindowListener2
        virtual void SAL_CALL windowEnabled( const ::com::sun::star::lang::EventObject& e ) throw (::com::sun::star::uno::RuntimeException);
        virtual void SAL_CALL windowDisabled( const ::com::sun::star::lang::EventObject& e ) throw (::com::sun::star::uno::RuntimeException);

        // XWindowListener
        virtual void SAL_CALL windowResized( const ::com::sun::star::awt::WindowEvent& e ) throw (::com::sun::star::uno::RuntimeException);
        virtual void SAL_CALL windowMoved( const ::com::sun::star::awt::WindowEvent& e ) throw (::com::sun::star::uno::RuntimeException);
        virtual void SAL_CALL windowShown( const ::com::sun::star::lang::EventObject& e ) throw (::com::sun::star::uno::RuntimeException);
        virtual void SAL_CALL windowHidden( const ::com::sun::star::lang::EventObject& e ) throw (::com::sun::star::uno::RuntimeException);

        // XEventListener
        virtual void SAL_CALL disposing( const ::com::sun::star::lang::EventObject& Source ) throw (::com::sun::star::uno::RuntimeException);

    private:
        /** ensures that the window's Enabled state matches what is described at the model
            @precond
                our mutex is locked
        */
        void    impl_ensureEnabledState_nothrow_nolck();
    };

	//--------------------------------------------------------------------
    WindowStateGuard_Impl::WindowStateGuard_Impl( const Reference< XWindow2 >& _rxWindow, const Reference< XPropertySet >& _rxMdelProps )
        :m_xWindow( _rxWindow )
        ,m_xModelProps( _rxMdelProps )
    {
        if ( !m_xWindow.is() || !m_xModelProps.is() )
            throw RuntimeException();

        osl_incrementInterlockedCount( &m_refCount );
        {
            m_xWindow->addWindowListener( this );
        }
        osl_decrementInterlockedCount( &m_refCount );
    }

    //--------------------------------------------------------------------
    void WindowStateGuard_Impl::dispose()
    {
        ::osl::MutexGuard aGuard( m_aMutex );
        if ( !m_xWindow.is() )
            // already disposed
            return;

        m_xWindow->removeWindowListener( this );
        m_xWindow.clear();
    }

    //--------------------------------------------------------------------
    void WindowStateGuard_Impl::impl_ensureEnabledState_nothrow_nolck()
    {
        try
        {
            Reference< XWindow2 > xWindow;
            sal_Bool bEnabled = sal_False;
            sal_Bool bShouldBeEnabled = sal_False;
            {
                ::osl::MutexGuard aGuard( m_aMutex );
                if ( !m_xWindow.is() || !m_xModelProps.is() )
                    return;
                xWindow = m_xWindow;
                bEnabled = xWindow->isEnabled();
                OSL_VERIFY( m_xModelProps->getPropertyValue( PROPERTY_ENABLED ) >>= bShouldBeEnabled );
            }

            if ( !bShouldBeEnabled && bEnabled && xWindow.is() )
                xWindow->setEnable( sal_False );
        }
        catch( const Exception& )
        {
        	DBG_UNHANDLED_EXCEPTION();
        }
    }

    //--------------------------------------------------------------------
    void SAL_CALL WindowStateGuard_Impl::windowEnabled( const EventObject& /*e*/ ) throw (RuntimeException)
    {
        impl_ensureEnabledState_nothrow_nolck();
    }
    
    //--------------------------------------------------------------------
    void SAL_CALL WindowStateGuard_Impl::windowDisabled( const EventObject& /*e*/ ) throw (RuntimeException)
    {
        impl_ensureEnabledState_nothrow_nolck();
    }
    
    //--------------------------------------------------------------------
    void SAL_CALL WindowStateGuard_Impl::windowResized( const WindowEvent& /*e*/ ) throw (RuntimeException)
    {
        // not interested in
    }
    
    //--------------------------------------------------------------------
    void SAL_CALL WindowStateGuard_Impl::windowMoved( const WindowEvent& /*e*/ ) throw (RuntimeException)
    {
        // not interested in
    }
    
    //--------------------------------------------------------------------
    void SAL_CALL WindowStateGuard_Impl::windowShown( const EventObject& /*e*/ ) throw (RuntimeException)
    {
        // not interested in
    }
    
    //--------------------------------------------------------------------
    void SAL_CALL WindowStateGuard_Impl::windowHidden( const EventObject& /*e*/ ) throw (RuntimeException)
    {
        // not interested in
    }

    //--------------------------------------------------------------------
    void SAL_CALL WindowStateGuard_Impl::disposing( const EventObject& Source ) throw (RuntimeException)
    {
        OSL_ENSURE( Source.Source == m_xWindow, "WindowStateGuard_Impl::disposing: where does this come from?" );
        (void)Source;
        dispose();
    }

	//====================================================================
	//= WindowStateGuard
	//====================================================================
	//--------------------------------------------------------------------
    WindowStateGuard::WindowStateGuard()
    {
    }

	//--------------------------------------------------------------------
    WindowStateGuard::~WindowStateGuard()
    {
    }

	//--------------------------------------------------------------------
    void WindowStateGuard::attach( const Reference< XWindow2 >& _rxWindow, const Reference< XControlModel >& _rxModel )
    {
        if ( m_pImpl.is() )
        {
            m_pImpl->dispose();
            m_pImpl = NULL;
        }

        Reference< XPropertySet > xModelProps( _rxModel, UNO_QUERY );
        OSL_ENSURE( xModelProps.is() || !_rxModel.is(), "WindowStateGuard::attach: a model which is no XPropertySet?" );
        if ( _rxWindow.is() && xModelProps.is() )
            m_pImpl = new WindowStateGuard_Impl( _rxWindow, xModelProps );
    }

//........................................................................
} // namespace frm
//........................................................................