/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_SVX_SOURCE_ACCESSIBILITY_ACCESSIBLETEXTEVENTQUEUE_HXX
#define INCLUDED_SVX_SOURCE_ACCESSIBILITY_ACCESSIBLETEXTEVENTQUEUE_HXX

#include <memory>
#include <deque>
#include <algorithm>

class SfxHint;
class SdrHint;
class TextHint;
class SvxViewChangedHint;
class SvxEditSourceHint;

namespace accessibility
{
/** This class handles the notification events for the
    AccessibleTextHelper class.

    For various reasons, we cannot process EditEngine events as
    they arrive, but have to queue and handle them in a batch.
  */
class AccessibleTextEventQueue
{
public:
    AccessibleTextEventQueue();
    ~AccessibleTextEventQueue();

    /// Append event to end of queue
    void Append(const SdrHint& rHint);
    /// Append event to end of queue
    void Append(const TextHint& rHint);
    /// Append event to end of queue
    void Append(const SvxViewChangedHint& rHint);
    /// Append event to end of queue
    void Append(const SvxEditSourceHint& rHint);

    /** Pop first queue element

        return first queue element, ownership transfers to caller
    */
    ::std::unique_ptr<SfxHint> PopFront();

    /** Apply functor to every queue member

        @param rFunctor
        Functor to apply. Functor receives queue element as
        parameter: void func( const SfxHint* );
    */
    template <typename Functor> void ForEach(Functor& rFunctor) const
    {
        // #109864# Make sure results are put back into rFunctor
        rFunctor = ::std::for_each(maEventQueue.begin(), maEventQueue.end(), rFunctor);
    }

    /// Query whether queue is empty
    bool IsEmpty() const;

    /// Clear event queue
    void Clear();

private:
    std::deque<SfxHint*> maEventQueue;
};

} // end of namespace accessibility

#endif // INCLUDED_SVX_SOURCE_ACCESSIBILITY_ACCESSIBLETEXTEVENTQUEUE_HXX

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