axmol/cocos/ui/UIScrollView.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
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all copies or substantial portions of the Software.

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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#ifndef __UISCROLLVIEW_H__
#define __UISCROLLVIEW_H__

#include "ui/UILayout.h"
#include "ui/GUIExport.h"
#include <list>

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

class EventFocusListener;

namespace ui {

/**
 *Scrollview scroll event type.
 *@deprecated use @see `ScrollView::EventType` instead.
 */
typedef enum
{
    SCROLLVIEW_EVENT_SCROLL_TO_TOP,
    SCROLLVIEW_EVENT_SCROLL_TO_BOTTOM,
    SCROLLVIEW_EVENT_SCROLL_TO_LEFT,
    SCROLLVIEW_EVENT_SCROLL_TO_RIGHT,
    SCROLLVIEW_EVENT_SCROLLING,
    SCROLLVIEW_EVENT_BOUNCE_TOP,
    SCROLLVIEW_EVENT_BOUNCE_BOTTOM,
    SCROLLVIEW_EVENT_BOUNCE_LEFT,
    SCROLLVIEW_EVENT_BOUNCE_RIGHT
}ScrollviewEventType;

/**
 * A callback which would be called when a ScrollView is scrolling.
 *@deprecated Use @see `ccScrollViewCallback` instead.
 */
typedef void (Ref::*SEL_ScrollViewEvent)(Ref*, ScrollviewEventType);
#define scrollvieweventselector(_SELECTOR) (SEL_ScrollViewEvent)(&_SELECTOR)

/**
 * Layout container for a view hierarchy that can be scrolled by the user, allowing it to be larger than the physical display.
 * It holds a inner `Layout` container for storing child items hironzontally or vertically.
 */
class CC_GUI_DLL ScrollView : public Layout
{

    DECLARE_CLASS_GUI_INFO

public:
    /**
     * ScrollView scroll direction type.
     */
    enum class Direction
    {
        NONE,
        VERTICAL,
        HORIZONTAL,
        BOTH
    };

    /**
     * Scrollview scroll event type.
     */
    enum class EventType
    {
        SCROLL_TO_TOP,
        SCROLL_TO_BOTTOM,
        SCROLL_TO_LEFT,
        SCROLL_TO_RIGHT,
        SCROLLING,
        BOUNCE_TOP,
        BOUNCE_BOTTOM,
        BOUNCE_LEFT,
        BOUNCE_RIGHT
    };

    /**
     * A callback which would be called when a ScrollView is scrolling.
     */
    typedef std::function<void(Ref*, EventType)> ccScrollViewCallback;

    /**
     * Default constructor
     * @js ctor
     * @lua new
     */
    ScrollView();

    /**
     * Default destructor
     * @js NA
     * @lua NA
     */
    virtual ~ScrollView();

    /**
     * Create an empty ScrollView.
     * @return A ScrollView instance.
     */
    static ScrollView* create();

    /**
     * Changes scroll direction of scrollview.
     *
     * @see `Direction`
     * @param dir Scroll direction enum.
     */
    virtual void setDirection(Direction dir);

    /**
     * Query scroll direction of scrollview.
     *
     * @see `Direction`      Direction::VERTICAL means vertical scroll, Direction::HORIZONTAL means horizontal scroll
     *
     * @return Scrollview scroll direction.
     */
    Direction getDirection()const;

    /**
     * Get inner container of scrollview.
     *
     * Inner container is a child of scrollview.
     *
     * @return Inner container pointer.
     */
    Layout* getInnerContainer()const;

    /**
     * Scroll inner container to bottom boundary of scrollview.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToBottom(float second, bool attenuated);

    /**
     * Scroll inner container to top boundary of scrollview.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToTop(float second, bool attenuated);

    /**
     * Scroll inner container to left boundary of scrollview.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToLeft(float second, bool attenuated);

    /**
     * Scroll inner container to right boundary of scrollview.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToRight(float time, bool attenuated);

    /**
     * Scroll inner container to top and left boundary of scrollview.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToTopLeft(float second, bool attenuated);

    /**
     * Scroll inner container to top and right boundary of scrollview.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToTopRight(float time, bool attenuated);

    /**
     * Scroll inner container to bottom and left boundary of scrollview.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToBottomLeft(float second, bool attenuated);

    /**
     * Scroll inner container to bottom and right boundary of scrollview.
     * @param second Time in seconds
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToBottomRight(float time, bool attenuated);

    /**
     * Scroll inner container to vertical percent position of scrollview.
     * @param percent A value between 0 and 100.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToPercentVertical(float percent, float second, bool attenuated);

    /**
     * Scroll inner container to horizontal percent position of scrollview.
     * @param percent A value between 0 and 100.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToPercentHorizontal(float percent, float second, bool attenuated);

    /**
     * Scroll inner container to both direction percent position of scrollview.
     * @param percent A value between 0 and 100.
     * @param second Time in seconds.
     * @param attenuated Whether scroll speed attenuate or not.
     */
    void scrollToPercentBothDirection(const Vec2& percent, float second, bool attenuated);

    /**
     * Move inner container to bottom boundary of scrollview.
     */
    void jumpToBottom();

    /**
     * Move inner container to top boundary of scrollview.
     */
    void jumpToTop();

    /**
     * Move inner container to left boundary of scrollview.
     */
    void jumpToLeft();

    /**
     * Move inner container to right boundary of scrollview.
     */
    void jumpToRight();

    /**
     * Move inner container to top and left boundary of scrollview.
     */
    void jumpToTopLeft();

    /**
     * Move inner container to top and right boundary of scrollview.
     */
    void jumpToTopRight();

    /**
     * Move inner container to bottom and left boundary of scrollview.
     */
    void jumpToBottomLeft();

    /**
     * Move inner container to bottom and right boundary of scrollview.
     */
    void jumpToBottomRight();

    /**
     * Move inner container to vertical percent position of scrollview.
     * @param percent A value between 0 and 100.
     */
    void jumpToPercentVertical(float percent);

    /**
     * Move inner container to horizontal percent position of scrollview.
     * @param percent   A value between 0 and 100.
     */
    void jumpToPercentHorizontal(float percent);

    /**
     * Move inner container to both direction percent position of scrollview.
     * @param percent   A value between 0 and 100.
     */
    void jumpToPercentBothDirection(const Vec2& percent);

    /**
     * Change inner container size of scrollview.
     *
     * Inner container size must be larger than or equal scrollview's size.
     *
     * @param size Inner container size.
     */
    void setInnerContainerSize(const Size &size);

    /**
     * Get inner container size of scrollview.
     *
     * Inner container size must be larger than or equal scrollview's size.
     *
     * @return The inner container size.
     */
	const Size& getInnerContainerSize() const;

    /**
     * Add callback function which will be called  when scrollview event triggered.
     * @deprecated Use @see `addEventListener` instead.
     * @param target A pointer of `Ref*` type.
     * @param selector A member function pointer with type of `SEL_ScrollViewEvent`.
     */
    CC_DEPRECATED_ATTRIBUTE void addEventListenerScrollView(Ref* target, SEL_ScrollViewEvent selector);

    /**
     * Add callback function which will be called  when scrollview event triggered.
     * @param callback A callback function with type of `ccScrollViewCallback`.
     */
    virtual void addEventListener(const ccScrollViewCallback& callback);

    //override functions
    virtual void addChild(Node* child)override;
    virtual void addChild(Node * child, int localZOrder)override;
    virtual void addChild(Node* child, int localZOrder, int tag) override;
    virtual void addChild(Node* child, int localZOrder, const std::string &name) override;
    virtual void removeAllChildren() override;
    virtual void removeAllChildrenWithCleanup(bool cleanup) override;
    virtual void removeChild(Node* child, bool cleaup = true) override;
    virtual Vector<Node*>& getChildren() override;
    virtual const Vector<Node*>& getChildren() const override;
    virtual ssize_t getChildrenCount() const override;
    virtual Node * getChildByTag(int tag) const override;
    virtual Node* getChildByName(const std::string& name)const override;
    //touch event callback
    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;


    /**
     * @brief Toggle bounce enabled when scroll to the edge.
     *
     * @param enabled True if enable bounce, false otherwise.
     */
    void setBounceEnabled(bool enabled);

    /**
     * @brief Query bounce state.
     *
     * @return True if bounce is enabled, false otherwise.
     */
    bool isBounceEnabled() const;

    /**
     * @brief Toggle whether enable scroll inertia while scrolling.
     *
     * @param enabled True if enable inertia, false otherwise.
     */
    void setInertiaScrollEnabled(bool enabled);

    /**
     * @brief Query inertia scroll state.
     *
     * @return True if inertia is enabled, false otherwise.
     */
    bool isInertiaScrollEnabled() const;

    /**
     * Set layout type for scrollview.
     *
     * @see `Layout::Type`
     * @param type  Layout type enum.
     */
    virtual void setLayoutType(Type type) override;

    /**
     * Get the layout type for scrollview.
     *
     * @see `Layout::Type`
     * @return LayoutType
     */
    virtual Type getLayoutType() const override;

    /**
     * Return the "class name" of widget.
     */
    virtual std::string getDescription() const override;

    /**
     * @lua NA
     */
    virtual void onEnter() override;

    /**
     *  When a widget is in a layout, you could call this method to get the next focused widget within a specified direction.
     *  If the widget is not in a layout, it will return itself
     *@param direction the direction to look for the next focused widget in a layout
     *@param current  the current focused widget
     *@return the next focused widget in a layout
     */
    virtual Widget* findNextFocusedWidget(FocusDirection direction, Widget* current) override;

CC_CONSTRUCTOR_ACCESS:
    virtual bool init() override;

protected:
	enum class MoveDirection
	{
		TOP,
		BOTTOM,
		LEFT,
		RIGHT,
	};
	
    virtual void initRenderer() override;

    virtual void onSizeChanged() override;
    virtual void doLayout() override;

    virtual Widget* createCloneInstance() override;
    virtual void copySpecialProperties(Widget* model) override;
    virtual void copyClonedWidgetChildren(Widget* model) override;
	
	bool isOutOfBoundary(MoveDirection dir) const;
	bool isOutOfBoundaryTopOrBottom() const;
	bool isOutOfBoundaryLeftOrRight() const;
	
    void moveChildren(float offsetX, float offsetY);
	
	void startInertiaScroll();
	void processInertiaScrolling(float dt);
	
    void startAutoScroll(const Vec2& deltaMove, float duration, bool attenuated);
    void startAutoScrollChildrenWithDestination(const Vec2& des, float second, bool attenuated);
	void processAutoScrolling(float deltaTime);
	
	bool startBounceBackIfNeeded();
	
	void jumpToDestination(const Vec2& des);

	
    virtual bool scrollChildren(float touchOffsetX, float touchOffsetY);

	// Without bounce
	bool processScrollUp(float* offsetYResult, float touchOffsetY);
	bool processScrollDown(float* offsetYResult, float touchOffsetY);
	bool processScrollLeft(float* offsetXResult, float touchOffsetX);
	bool processScrollRight(float* offsetXResult, float touchOffsetX);
	
    void startRecordSlidAction();
    virtual void endRecordSlidAction();

    //ScrollViewProtocol
    virtual void handlePressLogic(Touch *touch) ;
    virtual void handleMoveLogic(Touch *touch) ;
    virtual void handleReleaseLogic(Touch *touch) ;

    virtual void interceptTouchEvent(Widget::TouchEventType event,Widget* sender,Touch *touch) override;

	void processScrollEvent(MoveDirection dir, bool bounce);
    void processScrollingEvent();
	void dispatchEvent(ScrollviewEventType scrollEventType, EventType eventType);
	
	Vec2 getHowMuchOutOfBoundary(const Vec2& addition) const;

protected:
    Layout* _innerContainer;

    Direction _direction;

    float _topBoundary;
    float _bottomBoundary;
    float _leftBoundary;
    float _rightBoundary;
	
	bool _bePressed;
	float _childFocusCancelOffset;
	
	bool _inertiaScrollEnabled;
	bool _inertiaScrolling;
	Vec2 _inertiaInitiVelocity;
	std::list<Vec2> _inertiaTouchDisplacements;
	std::list<float> _inertiaTouchTimeDeltas;
	long long _inertiaPrevTouchTimestamp;
	float _inertiaScrollExpectedTime;
	float _inertiaScrollElapsedTime;
	
	bool _autoScrolling;
	bool _autoScrollAttenuate;
	Vec2 _autoScrollStartPosition;
	Vec2 _autoScrollTargetDelta;
	float _autoScrollDuration;
	float _autoScrollAccumulatedTime;
	
	bool _bounceEnabled;
	bool _bouncingBack;
	
    Ref* _scrollViewEventListener;
#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_ScrollViewEvent _scrollViewEventSelector;
#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
    ccScrollViewCallback _eventCallback;
};

}
// end of ui group
/// @}
NS_CC_END
#endif /* defined(__CocoGUI__ScrollView__) */