axmol/cocos/ui/UIPageView.h

/****************************************************************************
Copyright (c) 2013-2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
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THE SOFTWARE.
****************************************************************************/

#ifndef __UIPAGEVIEW_H__
#define __UIPAGEVIEW_H__

#include "ui/UILayout.h"
#include "ui/GUIExport.h"

/**
 * @addtogroup ui
 * @{
 */
NS_CC_BEGIN

namespace ui {

/**
 *PageView page turn event type.
 *@deprecated Use `PageView::EventType` instead.
 */
typedef enum
{
    PAGEVIEW_EVENT_TURNING,
}PageViewEventType;

/**
 *A callback which would be called when a PageView turning event is happening.
 *@deprecated Use `PageView::ccPageViewCallback` instead.
 */
typedef void (Ref::*SEL_PageViewEvent)(Ref*, PageViewEventType);
#define pagevieweventselector(_SELECTOR)(SEL_PageViewEvent)(&_SELECTOR)

/**
 *@brief Layout manager that allows the user to flip left and right through pages of data.
 *
 */
class CC_GUI_DLL PageView : public Layout
{
    
    DECLARE_CLASS_GUI_INFO
    
public:
    /**
     * Page turn event tpye.
     */
    enum class EventType
    {
        TURNING
    };
    
    /**
     * Touch direction type.
     */
    enum class TouchDirection
    {
        LEFT,
        RIGHT
    };
    
    /**
     *PageView page turn event callback.
     */
    typedef std::function<void(Ref*,EventType)> ccPageViewCallback;

    /**
     * Default constructor
     * @js ctor
     */
    PageView();
    
    /**
     * Default destructor
     * @js NA
     */
    virtual ~PageView();
    
    /**
     * Create an empty PageView.
     *@return A PageView instance.
     */
    static PageView* create();
    
    /**
     * Add a widget as a page of PageView in a given index.
     *
     * @param widget    Widget to be added to pageview.
     * @param pageIdx   A given index.
     * @param forceCreate   If `forceCreate` is true and `widget` isn't exists, pageview would create a default page and add it.
     */
    void addWidgetToPage(Widget* widget, ssize_t pageIdx, bool forceCreate);
    
    /**
     * Insert a page into the end of PageView.
     *
     * @param page Page to be inserted.
     */
    void addPage(Layout* page);
    
    /**
     * Insert a page into PageView at a given index.
     *
     * @param page  Page to be inserted.
     * @param idx   A given index.
     */
    void insertPage(Layout* page, int idx);
    
    /**
     * Remove a page of PageView.
     *
     * @param page  Page to be removed.
     */
    void removePage(Layout* page);

    /**
     * Remove a page at a given index of PageView.
     *
     * @param index  A given index.
     */
    void removePageAtIndex(ssize_t index);
    
    
    /**
     * @brief Remove all pages of the PageView.
     */
    void removeAllPages();
    
    /**
     * Scroll to a page with a given index.
     *
     * @param idx   A given index in the PageView.
     */
    void scrollToPage(ssize_t idx);
    
    /**
     * Gets current displayed page index.
     * @return current page index.
     */
    ssize_t getCurPageIndex() const;
    
     
    /**
     * @brief Get all the pages in the PageView.
     * @return A vector of Layout pionters.
     */
    Vector<Layout*>& getPages();
    
    
    /**
     * @brief Get a page at a given index
     *
     * @param index A given index.
     * @return A layout pointer in PageView container.
     */
    Layout* getPage(ssize_t index);
    
    /**
     * Add a page turn callback to PageView, then when one page is turning, the callback will be called.
     *@deprecated Use `PageView::addEventListener` instead.
     *@param target A pointer of `Ref*` type.
     *@param selector A member function pointer with signature of `SEL_PageViewEvent`.
     */
    CC_DEPRECATED_ATTRIBUTE void addEventListenerPageView(Ref *target, SEL_PageViewEvent selector);

    
    /**
     * @brief Add a page turn callback to PageView, then when one page is turning, the callback will be called.
     *
     * @param callback A page turning callback.
     */
    void addEventListener(const ccPageViewCallback& callback);
    
    //override methods
    virtual bool onTouchBegan(Touch *touch, Event *unusedEvent) override;
    virtual void onTouchMoved(Touch *touch, Event *unusedEvent) override;
    virtual void onTouchEnded(Touch *touch, Event *unusedEvent) override;
    virtual void onTouchCancelled(Touch *touch, Event *unusedEvent) override;
    virtual void update(float dt) override;
    virtual void setLayoutType(Type type) override{};
    virtual Type getLayoutType() const override{return Type::ABSOLUTE;};
    virtual std::string getDescription() const override;
    virtual void onEnter() override;

    /**   
     *@brief If you don't specify the value, the pageView will turn page when scrolling at the half width of a page.
     *@param threshold  A threshold in float.
     */
    void setCustomScrollThreshold(float threshold);

    /**
     *@brief Query the custom scroll threshold of the PageView.
     *@return Custom scroll threshold in float.
     */
    float getCustomScrollThreshold()const;

    /**
     *@brief Set using user defined scroll page threshold or not.
     * If you set it to false, then the default scroll threshold is pageView.width / 2
     *@param flag True if using custom scroll threshold, false otherwise.
     */
    void setUsingCustomScrollThreshold(bool flag);

    /**
     *@brief Query whether use user defined scroll page threshold or not.
     *@return True if using custom scroll threshold, false otherwise.
     */
    bool isUsingCustomScrollThreshold()const;

CC_CONSTRUCTOR_ACCESS:
    virtual bool init() override;

protected:

    Layout* createPage();
    float getPositionXByIndex(ssize_t idx)const;
    ssize_t getPageCount()const;

    void updateBoundaryPages();
    virtual bool scrollPages(float touchOffset);
    void movePages(float offset);
    void pageTurningEvent();
    void updateAllPagesSize();
    void updateAllPagesPosition();
    void autoScroll(float dt);

    virtual void handleMoveLogic(Touch *touch) ;
    virtual void handleReleaseLogic(Touch *touch) ;
    virtual void interceptTouchEvent(TouchEventType event, Widget* sender,Touch *touch) override;
    
    
    virtual void onSizeChanged() override;
    virtual Widget* createCloneInstance() override;
    virtual void copySpecialProperties(Widget* model) override;
    virtual void copyClonedWidgetChildren(Widget* model) override;

    virtual void doLayout() override;

protected:
    enum class AutoScrollDirection
    {
        LEFT,
        RIGHT
    };
    bool _isAutoScrolling;
    float _autoScrollDistance;
    float _autoScrollSpeed;
    AutoScrollDirection _autoScrollDirection;
    
    ssize_t _curPageIdx;
    Vector<Layout*> _pages;

    TouchDirection _touchMoveDirection;
   
    Widget* _leftBoundaryChild;
    Widget* _rightBoundaryChild;
    
    float _leftBoundary;
    float _rightBoundary;
    float _customScrollThreshold;
    bool _usingCustomScrollThreshold;

    float _childFocusCancelOffset;

    Ref* _pageViewEventListener;
#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#elif _MSC_VER >= 1400 //vs 2005 or higher
#pragma warning (push)
#pragma warning (disable: 4996)
#endif
    SEL_PageViewEvent _pageViewEventSelector;
#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
#pragma GCC diagnostic warning "-Wdeprecated-declarations"
#elif _MSC_VER >= 1400 //vs 2005 or higher
#pragma warning (pop)
#endif
    ccPageViewCallback _eventCallback;
};

}
NS_CC_END
// end of ui group
/// @}

#endif /* defined(__PageView__) */