axmol/cocos2dx/text_input_node/CCIMEDispatcher.h

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

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****************************************************************************/

#ifndef __CC_IME_DISPATCHER_H__
#define __CC_IME_DISPATCHER_H__

#include "CCIMEDelegate.h"

NS_CC_BEGIN

/**
 * @addtogroup input
 * @{
 */

/**
@brief    Input Method Edit Message Dispatcher.
*/
class CC_DLL CCIMEDispatcher
{
public:
    ~CCIMEDispatcher();

    /**
    @brief Returns the shared CCIMEDispatcher object for the system.
    */
    static CCIMEDispatcher* sharedDispatcher();

//     /**
//     @brief Releases all CCIMEDelegates from the shared dispatcher.
//     */
//     static void purgeSharedDispatcher();

    /**
    @brief Dispatches the input text from IME.
    */
    void dispatchInsertText(const char * pText, int nLen);

    /**
    @brief Dispatches the delete-backward operation.
    */
    void dispatchDeleteBackward();

    /**
    @brief Get the content text from CCIMEDelegate, retrieved previously from IME.
    */
    const char * getContentText();

    //////////////////////////////////////////////////////////////////////////
    // dispatch keyboard notification
    //////////////////////////////////////////////////////////////////////////
    void dispatchKeyboardWillShow(CCIMEKeyboardNotificationInfo& info);
    void dispatchKeyboardDidShow(CCIMEKeyboardNotificationInfo& info);
    void dispatchKeyboardWillHide(CCIMEKeyboardNotificationInfo& info);
    void dispatchKeyboardDidHide(CCIMEKeyboardNotificationInfo& info);

protected:
    friend class CCIMEDelegate;

    /**
    @brief Add delegate to receive IME messages.
    */
    void addDelegate(CCIMEDelegate * pDelegate);

    /**
    @brief Attach the pDelegate to the IME.
    @return If the old delegate can detach from the IME, and the new delegate 
            can attach to the IME, return true, otherwise false.
    */
    bool attachDelegateWithIME(CCIMEDelegate * pDelegate);
    bool detachDelegateWithIME(CCIMEDelegate * pDelegate);

    /**
    @brief Remove the delegate from the delegates which receive IME messages.
    */
    void removeDelegate(CCIMEDelegate * pDelegate);

private:
    CCIMEDispatcher();
    
    class Impl;
    Impl * m_pImpl;
};

// end of input group
/// @}

NS_CC_END

#endif    // __CC_IME_DISPATCHER_H__