cocos2d-x二维TableView/GridView的实现
对于刚开始接触cocos2d-x的TableView的人来说，这个UI类看上去并非顾名思义的是个Table，而仅仅是个一维的List。
因为项目需要，我封装了一个TableView的子类来实现二维的功能。效果如下：
具体代码详见：
cocos2d-x-GridView
GridView的使用与TableView基本相同，只不过多了两个接口：
-
固定行数：调用setRowNum
-
固定列数：调用setColNum
这还需要修改一下cocos2d-x的TableView类的声明，主要是声明一些member function为virtual：
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187 | class TableView : public ScrollView, public ScrollViewDelegate
{
public:
enum class VerticalFillOrder
{
TOP_DOWN,
BOTTOM_UP
};
/** Empty contructor of TableView */
static TableView* create();
/**
* An intialized table view object
*
* @param dataSource data source
* @param size view size
* @return table view
* @code
* when this function bound to js or lua,the input params are changed
* in js:var create(var jsObject,var size)
* in lua:local create(var size)
* in lua:
* @endcode
*/
static TableView* create(TableViewDataSource* dataSource, Size size);
/**
* An initialized table view object
*
* @param dataSource data source;
* @param size view size
* @param container parent object for cells
* @return table view
* @code
* when this function bound to js or lua,the input params are changed
* in js:var create(var jsObject,var size,var container)
* in lua:local create(var size, var container)
* in lua:
* @endcode
*/
static TableView* create(TableViewDataSource* dataSource, Size size, Node *container);
/**
* @js ctor
*/
TableView();
/**
* @js NA
* @lua NA
*/
virtual ~TableView();
virtual bool initWithViewSize(Size size, Node* container = NULL);
/**
* data source
* @js NA
* @lua NA
*/
virtual TableViewDataSource* getDataSource() { return _dataSource; }
/**
* when this function bound to js or lua,the input params are changed
* in js:var setDataSource(var jsSource)
* in lua:local setDataSource()
* @endcode
*/
virtual void setDataSource(TableViewDataSource* source) { _dataSource = source; }
/**
* delegate
* @js NA
* @lua NA
*/
virtual TableViewDelegate* getDelegate() { return _tableViewDelegate; }
/**
* @code
* when this function bound to js or lua,the input params are changed
* in js:var setDelegate(var jsDelegate)
* in lua:local setDelegate()
* @endcode
*/
virtual void setDelegate(TableViewDelegate* pDelegate) { _tableViewDelegate = pDelegate; }
/**
* determines how cell is ordered and filled in the view.
*/
virtual void setVerticalFillOrder(VerticalFillOrder order);
virtual VerticalFillOrder getVerticalFillOrder();
/**
* Updates the content of the cell at a given index.
*
* @param idx index to find a cell
*/
virtual void updateCellAtIndex(ssize_t idx);
/**
* Inserts a new cell at a given index
*
* @param idx location to insert
*/
virtual void insertCellAtIndex(ssize_t idx);
/**
* Removes a cell at a given index
*
* @param idx index to find a cell
*/
virtual void removeCellAtIndex(ssize_t idx);
/**
* reloads data from data source. the view will be refreshed.
*/
virtual void reloadData();
/**
* Dequeues a free cell if available. nil if not.
*
* @return free cell
*/
virtual TableViewCell *dequeueCell();
/**
* Returns an existing cell at a given index. Returns nil if a cell is nonexistent at the moment of query.
*
* @param idx index
* @return a cell at a given index
*/
virtual TableViewCell *cellAtIndex(ssize_t idx);
// Overrides
virtual void scrollViewDidScroll(ScrollView* view) override;
virtual void scrollViewDidZoom(ScrollView* view) override {}
virtual bool onTouchBegan(Touch *pTouch, Event *pEvent) override;
virtual void onTouchMoved(Touch *pTouch, Event *pEvent) override;
virtual void onTouchEnded(Touch *pTouch, Event *pEvent) override;
virtual void onTouchCancelled(Touch *pTouch, Event *pEvent) override;
protected:
virtual long __indexFromOffset(Vec2 offset);
virtual long _indexFromOffset(Vec2 offset);
virtual Vec2 __offsetFromIndex(ssize_t index);
virtual Vec2 _offsetFromIndex(ssize_t index);
virtual void _moveCellOutOfSight(TableViewCell *cell);
virtual void _setIndexForCell(ssize_t index, TableViewCell *cell);
virtual void _addCellIfNecessary(TableViewCell * cell);
virtual void _updateCellPositions();
TableViewCell *_touchedCell;
/**
* vertical direction of cell filling
*/
VerticalFillOrder _vordering;
/**
* index set to query the indexes of the cells used.
*/
std::set<ssize_t>* _indices;
/**
* vector with all cell positions
*/
std::vector<float> _vCellsPositions;
//NSMutableIndexSet *indices_;
/**
* cells that are currently in the table
*/
Vector<TableViewCell*> _cellsUsed;
/**
* free list of cells
*/
Vector<TableViewCell*> _cellsFreed;
/**
* weak link to the data source object
*/
TableViewDataSource* _dataSource;
/**
* weak link to the delegate object
*/
TableViewDelegate* _tableViewDelegate;
Direction _oldDirection;
bool _isUsedCellsDirty;
public:
virtual void _updateContentSize();
};
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