axmol/cocos/ui/UIListView.h

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

http://www.cocos2d-x.org

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


#ifndef __UILISTVIEW_H__
#define __UILISTVIEW_H__

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

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

namespace ui{
    
/**
 * ListView click item event type.
 */
typedef enum
{
    LISTVIEW_ONSELECTEDITEM_START,
    LISTVIEW_ONSELECTEDITEM_END
}ListViewEventType;

/**
 * A callback which would be called when a ListView item is clicked.
 *@deprecated Use `ccListViewCallback` instead.
 */
typedef void (Ref::*SEL_ListViewEvent)(Ref*,ListViewEventType);
#define listvieweventselector(_SELECTOR) (SEL_ListViewEvent)(&_SELECTOR)

/**
 *@brief ListView is a view group that displays a list of scrollable items.
 *The list items are inserted to the list by using `addChild` or  `insertDefaultItem`.
 * @warning The list item in ListView doesn't support cell reuse at the moment, if you have a large amount of data need to be displayed, use  `TableView` instead.
 * ListView is a subclass of  `ScrollView`, so it shares many features of ScrollView.
 */
class CC_GUI_DLL ListView : public ScrollView
{
 
    DECLARE_CLASS_GUI_INFO
public:
    /**
     * Gravity for docking elements in ListView.
     */
    enum class Gravity
    {
        LEFT,
        RIGHT,
        CENTER_HORIZONTAL,
        TOP,
        BOTTOM,
        CENTER_VERTICAL
    };
    
    /**
     * ListView element item click event.
     */
    enum class EventType
    {
        ON_SELECTED_ITEM_START,
        ON_SELECTED_ITEM_END
    };
    
    /**
     * ListView item click callback.
     */
    typedef std::function<void(Ref*, EventType)> ccListViewCallback;
    
    /**
     * Default constructor
     */
    ListView();
    
    /**
     * Default destructor
     */
    virtual ~ListView();
    
    /**
     * Create an empty ListView.
     *@return A ListView instance.
     */
    static ListView* create();
    
    /**
     * Set a item model for listview.
     *
     * When calling `pushBackDefaultItem`, the model will be used as a blueprint and new model copy will be inserted into ListView.
     * @param model  Model in `Widget*`.
     */
    void setItemModel(Widget* model);
    
    /**
     * Insert a  a default item(create by a cloned model) at the end of the listview.
     */
    void pushBackDefaultItem();
    
    /**
     * Insert a default item(create by cloning model) into listview at a give index.
     *@param index  A index in ssize_t.
     */
    void insertDefaultItem(ssize_t index);
    
    /**
     * Insert a  custom item into the end of ListView.
     *@param item A item in `Widget*`.
     */
    void pushBackCustomItem(Widget* item);
    
    
    /**
     * @brief Insert a custom widget into ListView at a given index.
     *
     * @param item A widget pointer to be inserted.
     * @param index A given index in ssize_t.
     */
    void insertCustomItem(Widget* item, ssize_t index);
    
    /**
     *  Removes the last item of ListView.
     */
    void removeLastItem();
    
    /**
     * Remove a item at given index.
     *
     * @param index A given index in ssize_t.
     */
    void removeItem(ssize_t index);
    
    
    /**
     * @brief Remove all items in current ListView.
     *
     
     */
    void removeAllItems();
    
    /**
     * Return a item at a given index.
     *
     * @param index A given index in ssize_t.
     * @return A widget instance.
     */
    Widget* getItem(ssize_t index)const;
    
    /**
     * Return all items in a ListView.
     *@returns A vector of widget pointers.
     */
    Vector<Widget*>& getItems();
    
    /**
     * Return the index of specified widget.
     *
     * @param item  A widget pointer.
     * @return The index of a given widget in ListView.
     */
    ssize_t getIndex(Widget* item) const;
    
    /**
     * Set the gravity of ListView.
     * @see `ListViewGravity`
     */
    void setGravity(Gravity gravity);
    
    /**
     * Set the margin between each item in ListView.
     *
     * @param margin
     */
    void setItemsMargin(float margin);
    
    
    /**
     * @brief Query margin between each item in ListView.
     *
     
     * @return A margin in float.
     */
    float getItemsMargin()const;
    
    //override methods
    virtual void forceDoLayout()override;
    virtual void doLayout() override;
    virtual void addChild(Node* child)override;
    virtual void addChild(Node * child, int localZOrder)override;
    virtual void addChild(Node* child, int zOrder, int tag) override;
    virtual void addChild(Node* child, int zOrder, const std::string &name) override;
    virtual void removeAllChildren() override;
    virtual void removeAllChildrenWithCleanup(bool cleanup) override;
    virtual void removeChild(Node* child, bool cleaup = true) override;
    
        
    /**
     * @brief Query current selected widget's idnex.
     *
     
     * @return A index of a selected item.
     */
    ssize_t getCurSelectedIndex() const;
    
    /**
     * Add a event click callback to ListView, then one item of Listview is clicked, the callback will be called.
     *@deprecated Use  `addEventListener` instead.
     *@param target A pointer of `Ref*` type.
     *@param selector A member function pointer with type of `SEL_ListViewEvent`.
     */
    CC_DEPRECATED_ATTRIBUTE void addEventListenerListView(Ref* target, SEL_ListViewEvent selector);

    /**
     * Add a event click callback to ListView, then one item of Listview is clicked, the callback will be called.
     *@param callback A callback function with type of `ccListViewCallback`.
     */
    void addEventListener(const ccListViewCallback& callback);
    using ScrollView::addEventListener;

    /**
     * Changes scroll direction of scrollview.
     *
     *  Direction Direction::VERTICAL means vertical scroll, Direction::HORIZONTAL means horizontal scroll
     * @param dir, set the list view's scroll direction
     */
    virtual void setDirection(Direction dir) override;
    
    virtual std::string getDescription() const override;
    
    /**
     * @brief Refresh view and layout of ListView manually.
     * This method will mark ListView content as dirty and the content view will be refershed in the next frame.
     */
    void requestRefreshView();

    
    /**
     * @brief Refresh content view of ListView.
     */
    void refreshView();

CC_CONSTRUCTOR_ACCESS:
    virtual bool init() override;
    
protected:
    
    void updateInnerContainerSize();
    void remedyLayoutParameter(Widget* item);
    void remedyVerticalLayoutParameter(LinearLayoutParameter* layoutParameter, ssize_t itemIndex);
    void remedyHorizontalLayoutParameter(LinearLayoutParameter* layoutParameter,ssize_t itemIndex);
    
    virtual void onSizeChanged() override;
    virtual Widget* createCloneInstance() override;
    virtual void copySpecialProperties(Widget* model) override;
    virtual void copyClonedWidgetChildren(Widget* model) override;
    void selectedItemEvent(TouchEventType event);
    virtual void interceptTouchEvent(Widget::TouchEventType event,Widget* sender,Touch* touch) override;
protected:
    Widget* _model;
    
    Vector<Widget*> _items;
    
    Gravity _gravity;
    
    float _itemsMargin;
    
    ssize_t _curSelectedIndex;
    bool _refreshViewDirty;
    
    Ref*       _listViewEventListener;
#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_ListViewEvent    _listViewEventSelector;
#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
    ccListViewCallback _eventCallback;
};

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

#endif /* defined(__ListView__) */