RedCore/cocos2d/cocos/ui/UIScrollView.cpp

/****************************************************************************
Copyright (c) 2013-2017 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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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "ui/UIScrollView.h"
#include "base/CCDirector.h"
#include "base/ccUtils.h"
#include "platform/CCDevice.h"
#include "ui/UIScrollViewBar.h"
#include "2d/CCTweenFunction.h"
#include "2d/CCCamera.h"
NS_CC_BEGIN

static const int NUMBER_OF_GATHERED_TOUCHES_FOR_MOVE_SPEED = 5;
static const float OUT_OF_BOUNDARY_BREAKING_FACTOR = 0.05f;
static const float BOUNCE_BACK_DURATION = 1.0f;

#define MOVE_INCH            7.0f/160.0f

static float convertDistanceFromPointToInch(const Vec2& dis)
{
    auto glview = Director::getInstance()->getOpenGLView();
    int dpi = Device::getDPI();
    float distance = Vec2(dis.x * glview->getScaleX() / dpi, dis.y * glview->getScaleY() / dpi).getLength();
    return distance;
}

namespace ui {

IMPLEMENT_CLASS_GUI_INFO(ScrollView)

ScrollView::ScrollView():
_innerContainer(nullptr),
_direction(Direction::VERTICAL),
_topBoundary(0.0f),
_bottomBoundary(0.0f),
_leftBoundary(0.0f),
_rightBoundary(0.0f),
_bePressed(false),
_childFocusCancelOffsetInInch(MOVE_INCH),
_touchMovePreviousTimestamp(0),
_touchTotalTimeThreshold(0.5f),
_autoScrolling(false),
_autoScrollAttenuate(true),
_autoScrollTotalTime(0),
_autoScrollAccumulatedTime(0),
_autoScrollCurrentlyOutOfBoundary(false),
_autoScrollBraking(false),
_inertiaScrollEnabled(true),
_bounceEnabled(false),
_outOfBoundaryAmount(Vec2::ZERO),
_outOfBoundaryAmountDirty(true),
_scrollBarEnabled(true),
_verticalScrollBar(nullptr),
_horizontalScrollBar(nullptr),
_scrollViewEventListener(nullptr),
_scrollViewEventSelector(nullptr),
_eventCallback(nullptr)
{
    setTouchEnabled(true);
    _propagateTouchEvents = false;
}

ScrollView::~ScrollView()
{
    _verticalScrollBar = nullptr;
    _horizontalScrollBar = nullptr;
    _scrollViewEventListener = nullptr;
    _scrollViewEventSelector = nullptr;
}

ScrollView* ScrollView::create()
{
    ScrollView* widget = new (std::nothrow) ScrollView();
    if (widget && widget->init())
    {
        widget->autorelease();
        return widget;
    }
    CC_SAFE_DELETE(widget);
    return nullptr;
}

void ScrollView::onEnter()
{
#if CC_ENABLE_SCRIPT_BINDING
    if (_scriptType == kScriptTypeJavascript)
    {
        if (ScriptEngineManager::sendNodeEventToJSExtended(this, kNodeOnEnter))
            return;
    }
#endif

    Layout::onEnter();
    scheduleUpdate();
}

bool ScrollView::init()
{
    if (Layout::init())
    {
        setClippingEnabled(true);
        _innerContainer->setTouchEnabled(false);
        if(_scrollBarEnabled)
        {
            initScrollBar();
        }
        return true;
    }
    return false;
}

void ScrollView::initRenderer()
{
    Layout::initRenderer();
    _innerContainer = Layout::create();
    _innerContainer->setColor(Color3B(255,255,255));
    _innerContainer->setOpacity(255);
    _innerContainer->setCascadeColorEnabled(true);
    _innerContainer->setCascadeOpacityEnabled(true);
    addProtectedChild(_innerContainer, 1, 1);
}

void ScrollView::onSizeChanged()
{
    Layout::onSizeChanged();
    _topBoundary = _contentSize.height;
    _rightBoundary = _contentSize.width;
    Size innerSize = _innerContainer->getContentSize();
    float orginInnerSizeWidth = innerSize.width;
    float orginInnerSizeHeight = innerSize.height;
    float innerSizeWidth = MAX(orginInnerSizeWidth, _contentSize.width);
    float innerSizeHeight = MAX(orginInnerSizeHeight, _contentSize.height);
    _innerContainer->setContentSize(Size(innerSizeWidth, innerSizeHeight));
    setInnerContainerPosition(Vec2(0, _contentSize.height - _innerContainer->getContentSize().height));

    if (_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->onScrolled(getHowMuchOutOfBoundary());
    }
    if (_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->onScrolled(getHowMuchOutOfBoundary());
    }
}

void ScrollView::setInnerContainerSize(const Size &size)
{
    float innerSizeWidth = _contentSize.width;
    float innerSizeHeight = _contentSize.height;
    Size originalInnerSize = _innerContainer->getContentSize();
    if (size.width < _contentSize.width)
    {
        CCLOG("Inner width <= scrollview width, it will be force sized!");
    }
    else
    {
        innerSizeWidth = size.width;
    }
    if (size.height < _contentSize.height)
    {
        CCLOG("Inner height <= scrollview height, it will be force sized!");
    }
    else
    {
        innerSizeHeight = size.height;
    }
    _innerContainer->setContentSize(Size(innerSizeWidth, innerSizeHeight));

    // Calculate and set the position of the inner container.
    Vec2 pos = _innerContainer->getPosition();
    if (_innerContainer->getLeftBoundary() != 0.0f)
    {
        pos.x = _innerContainer->getAnchorPoint().x * _innerContainer->getContentSize().width;
    }
    if (_innerContainer->getTopBoundary() != _contentSize.height)
    {
        pos.y = _contentSize.height - (1.0f - _innerContainer->getAnchorPoint().y) * _innerContainer->getContentSize().height;
    }
    setInnerContainerPosition(pos);
    
    updateScrollBar(Vec2::ZERO);
}

const Size& ScrollView::getInnerContainerSize() const
{
    return _innerContainer->getContentSize();
}

void ScrollView::setInnerContainerPosition(const Vec2 &position)
{
    if(position == _innerContainer->getPosition())
    {
        return;
    }
    _innerContainer->setPosition(position);
    _outOfBoundaryAmountDirty = true;
    
    // Process bouncing events
    if(_bounceEnabled)
    {
        for(int direction = (int) MoveDirection::TOP; direction < (int) MoveDirection::RIGHT; ++direction)
        {
            if(isOutOfBoundary((MoveDirection) direction))
            {
                processScrollEvent((MoveDirection) direction, true);
            }
        }
    }
    
    this->retain();
    if (_eventCallback)
    {
        _eventCallback(this, EventType::CONTAINER_MOVED);
    }
    if (_ccEventCallback)
    {
        _ccEventCallback(this, static_cast<int>(EventType::CONTAINER_MOVED));
    }
    this->release();
}
    
const Vec2& ScrollView::getInnerContainerPosition() const
{
    return _innerContainer->getPosition();
}

void ScrollView::addChild(Node* child)
{
    ScrollView::addChild(child, child->getLocalZOrder(), child->getTag());
}

void ScrollView::addChild(Node * child, int localZOrder)
{
    ScrollView::addChild(child, localZOrder, child->getTag());
}

void ScrollView::addChild(Node *child, int zOrder, int tag)
{
    child->setGlobalZOrder(_globalZOrder);
    _innerContainer->addChild(child, zOrder, tag);
}

void ScrollView::addChild(Node* child, int zOrder, const std::string &name)
{
    child->setGlobalZOrder(_globalZOrder);
    _innerContainer->addChild(child, zOrder, name);
}

void ScrollView::removeAllChildren()
{
    removeAllChildrenWithCleanup(true);
}

void ScrollView::removeAllChildrenWithCleanup(bool cleanup)
{
    _innerContainer->removeAllChildrenWithCleanup(cleanup);
}

void ScrollView::removeChild(Node* child, bool cleanup)
{
    return _innerContainer->removeChild(child, cleanup);
}

Vector<Node*>& ScrollView::getChildren()
{
    return _innerContainer->getChildren();
}

const Vector<Node*>& ScrollView::getChildren() const
{
    return _innerContainer->getChildren();
}

ssize_t ScrollView::getChildrenCount() const
{
    return _innerContainer->getChildrenCount();
}

Node* ScrollView::getChildByTag(int tag) const
{
    return _innerContainer->getChildByTag(tag);
}

Node* ScrollView::getChildByName(const std::string& name)const
{
    return _innerContainer->getChildByName(name);
}

void ScrollView::moveInnerContainer(const Vec2& deltaMove, bool canStartBounceBack)
{
    Vec2 adjustedMove = flattenVectorByDirection(deltaMove);

    setInnerContainerPosition(getInnerContainerPosition() + adjustedMove);

    Vec2 outOfBoundary = getHowMuchOutOfBoundary();
    updateScrollBar(outOfBoundary);

    if(_bounceEnabled && canStartBounceBack)
    {
        startBounceBackIfNeeded();
    }
}

void ScrollView::updateScrollBar(const Vec2& outOfBoundary)
{
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->onScrolled(outOfBoundary);
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->onScrolled(outOfBoundary);
    }
}

Vec2 ScrollView::calculateTouchMoveVelocity() const
{
    float totalTime = 0;
    for(auto &timeDelta : _touchMoveTimeDeltas)
    {
        totalTime += timeDelta;
    }
    if(totalTime == 0 || totalTime >= _touchTotalTimeThreshold)
    {
        return Vec2::ZERO;
    }
    
    Vec2 totalMovement;
    for(auto &displacement : _touchMoveDisplacements)
    {
        totalMovement += displacement;
    }
    return totalMovement / totalTime;
}

void ScrollView::startInertiaScroll(const Vec2& touchMoveVelocity)
{
    const float MOVEMENT_FACTOR = 0.7f;
    Vec2 inertiaTotalMovement = touchMoveVelocity * MOVEMENT_FACTOR;
    startAttenuatingAutoScroll(inertiaTotalMovement, touchMoveVelocity);
}

bool ScrollView::startBounceBackIfNeeded()
{
    if (!_bounceEnabled)
    {
        return false;
    }
    Vec2 bounceBackAmount = getHowMuchOutOfBoundary();
    if(fltEqualZero(bounceBackAmount))
    {
        return false;
    }
    
    startAutoScroll(bounceBackAmount, BOUNCE_BACK_DURATION, true);
    return true;
}

Vec2 ScrollView::flattenVectorByDirection(const Vec2& vector)
{
    Vec2 result = vector;
    result.x = (_direction == Direction::VERTICAL ? 0 : result.x);
    result.y = (_direction == Direction::HORIZONTAL ? 0 : result.y);
    return result;
}

Vec2 ScrollView::getHowMuchOutOfBoundary(const Vec2& addition)
{
    if(addition == Vec2::ZERO && !_outOfBoundaryAmountDirty)
    {
        return _outOfBoundaryAmount;
    }
    
    Vec2 outOfBoundaryAmount(Vec2::ZERO);
    if(_innerContainer->getLeftBoundary() + addition.x > _leftBoundary)
    {
        outOfBoundaryAmount.x = _leftBoundary - (_innerContainer->getLeftBoundary() + addition.x);
    }
    else if(_innerContainer->getRightBoundary() + addition.x < _rightBoundary)
    {
        outOfBoundaryAmount.x = _rightBoundary - (_innerContainer->getRightBoundary() + addition.x);
    }
    
    if(_innerContainer->getTopBoundary() + addition.y < _topBoundary)
    {
        outOfBoundaryAmount.y = _topBoundary - (_innerContainer->getTopBoundary() + addition.y);
    }
    else if(_innerContainer->getBottomBoundary() + addition.y > _bottomBoundary)
    {
        outOfBoundaryAmount.y = _bottomBoundary - (_innerContainer->getBottomBoundary() + addition.y);
    }
    
    if(addition == Vec2::ZERO)
    {
        _outOfBoundaryAmount = outOfBoundaryAmount;
        _outOfBoundaryAmountDirty = false;
    }
    return outOfBoundaryAmount;
}

bool ScrollView::isOutOfBoundary(MoveDirection dir)
{
    Vec2 outOfBoundary = getHowMuchOutOfBoundary();
    switch(dir)
    {
        case MoveDirection::TOP: return outOfBoundary.y > 0;
        case MoveDirection::BOTTOM: return outOfBoundary.y < 0;
        case MoveDirection::LEFT: return outOfBoundary.x < 0;
        case MoveDirection::RIGHT: return outOfBoundary.x > 0;
    }
    return false;
}

bool ScrollView::isOutOfBoundary()
{
    return !fltEqualZero(getHowMuchOutOfBoundary());
}

void ScrollView::startAutoScrollToDestination(const Vec2& destination, float timeInSec, bool attenuated)
{
    startAutoScroll(destination - _innerContainer->getPosition(), timeInSec, attenuated);
}

static float calculateAutoScrollTimeByInitialSpeed(float initialSpeed)
{
    // Calculate the time from the initial speed according to quintic polynomial.
    float time = sqrtf(sqrtf(initialSpeed / 5));
    return time;
}

void ScrollView::startAttenuatingAutoScroll(const Vec2& deltaMove, const Vec2& initialVelocity)
{
    float time = calculateAutoScrollTimeByInitialSpeed(initialVelocity.length());
    startAutoScroll(deltaMove, time, true);
}

void ScrollView::startAutoScroll(const Vec2& deltaMove, float timeInSec, bool attenuated)
{
    Vec2 adjustedDeltaMove = flattenVectorByDirection(deltaMove);
    
    _autoScrolling = true;
    _autoScrollTargetDelta = adjustedDeltaMove;
    _autoScrollAttenuate = attenuated;
    _autoScrollStartPosition = _innerContainer->getPosition();
    _autoScrollTotalTime = timeInSec;
    _autoScrollAccumulatedTime = 0;
    _autoScrollBraking = false;
    _autoScrollBrakingStartPosition = Vec2::ZERO;
    
    // If the destination is also out of boundary of same side, start brake from beginning.
    Vec2 currentOutOfBoundary = getHowMuchOutOfBoundary();
    if (!fltEqualZero(currentOutOfBoundary))
    {
        _autoScrollCurrentlyOutOfBoundary = true;
        Vec2 afterOutOfBoundary = getHowMuchOutOfBoundary(adjustedDeltaMove);
        if(currentOutOfBoundary.x * afterOutOfBoundary.x > 0 || currentOutOfBoundary.y * afterOutOfBoundary.y > 0)
        {
            _autoScrollBraking = true;
        }
    }
}

void ScrollView::stopAutoScroll()
{
    _autoScrolling = false;
    _autoScrollAttenuate = true;
    _autoScrollTotalTime = 0;
    _autoScrollAccumulatedTime = 0;
}

bool ScrollView::isNecessaryAutoScrollBrake()
{
    if(_autoScrollBraking)
    {
        return true;
    }
    
    if(isOutOfBoundary())
    {
        // It just went out of boundary.
        if(!_autoScrollCurrentlyOutOfBoundary)
        {
            _autoScrollCurrentlyOutOfBoundary = true;
            _autoScrollBraking = true;
            _autoScrollBrakingStartPosition = getInnerContainerPosition();
            return true;
        }
    }
    else
    {
        _autoScrollCurrentlyOutOfBoundary = false;
    }
    return false;
}
    
float ScrollView::getAutoScrollStopEpsilon() const
{
    return FLT_EPSILON;
}


bool ScrollView::fltEqualZero(const Vec2& point) const
{
    return (fabsf(point.x) <= 0.0001f && fabsf(point.y) <= 0.0001f);
}


    
void ScrollView::processAutoScrolling(float deltaTime)
{
    // Make auto scroll shorter if it needs to deaccelerate.
    float brakingFactor = (isNecessaryAutoScrollBrake() ? OUT_OF_BOUNDARY_BREAKING_FACTOR : 1);
    
    // Elapsed time
    _autoScrollAccumulatedTime += deltaTime * (1 / brakingFactor);
    
    // Calculate the progress percentage
    float percentage = MIN(1, _autoScrollAccumulatedTime / _autoScrollTotalTime);
    if(_autoScrollAttenuate)
    {
        // Use quintic(5th degree) polynomial
        percentage = tweenfunc::quintEaseOut(percentage);
    }
    
    // Calculate the new position
    Vec2 newPosition = _autoScrollStartPosition + (_autoScrollTargetDelta * percentage);
    bool reachedEnd = std::abs(percentage - 1) <= this->getAutoScrollStopEpsilon();
    
    if (reachedEnd)
    {
        newPosition = _autoScrollStartPosition + _autoScrollTargetDelta;
    }

    if(_bounceEnabled)
    {
        // The new position is adjusted if out of boundary
        newPosition = _autoScrollBrakingStartPosition + (newPosition - _autoScrollBrakingStartPosition) * brakingFactor;
    }
    else
    {
        // Don't let go out of boundary
        Vec2 moveDelta = newPosition - getInnerContainerPosition();
        Vec2 outOfBoundary = getHowMuchOutOfBoundary(moveDelta);
        if (!fltEqualZero(outOfBoundary))
        {
            newPosition += outOfBoundary;
            reachedEnd = true;
        }
    }

    // Finish auto scroll if it ended
    if(reachedEnd)
    {
        _autoScrolling = false;
        dispatchEvent(SCROLLVIEW_EVENT_AUTOSCROLL_ENDED, EventType::AUTOSCROLL_ENDED);
    }

    moveInnerContainer(newPosition - getInnerContainerPosition(), reachedEnd);
}

void ScrollView::jumpToDestination(const Vec2 &des)
{
    _autoScrolling = false;
    moveInnerContainer(des - getInnerContainerPosition(), true);
}

void ScrollView::scrollChildren(const Vec2& deltaMove)
{
    Vec2 realMove = deltaMove;
    if(_bounceEnabled)
    {
        // If the position of the inner container is out of the boundary, the offsets should be divided by two.
        Vec2 outOfBoundary = getHowMuchOutOfBoundary();
        realMove.x *= (outOfBoundary.x == 0 ? 1 : 0.5f);
        realMove.y *= (outOfBoundary.y == 0 ? 1 : 0.5f);
    }
    
    if(!_bounceEnabled)
    {
        Vec2 outOfBoundary = getHowMuchOutOfBoundary(realMove);
        realMove += outOfBoundary;
    }
    
    bool scrolledToLeft = false;
    bool scrolledToRight = false;
    bool scrolledToTop = false;
    bool scrolledToBottom = false;
    if (realMove.y > 0.0f) // up
    {
        float icBottomPos = _innerContainer->getBottomBoundary();
        if (icBottomPos + realMove.y >= _bottomBoundary)
        {
            scrolledToBottom = true;
        }
    }
    else if (realMove.y < 0.0f) // down
    {
        float icTopPos = _innerContainer->getTopBoundary();
        if (icTopPos + realMove.y <= _topBoundary)
        {
            scrolledToTop = true;
        }
    }
    
    if (realMove.x < 0.0f) // left
    {
        float icRightPos = _innerContainer->getRightBoundary();
        if (icRightPos + realMove.x <= _rightBoundary)
        {
            scrolledToRight = true;
        }
    }
    else if (realMove.x > 0.0f) // right
    {
        float icLeftPos = _innerContainer->getLeftBoundary();
        if (icLeftPos + realMove.x >= _leftBoundary)
        {
            scrolledToLeft = true;
        }
    }
    moveInnerContainer(realMove, false);
    
    if(realMove.x != 0 || realMove.y != 0)
    {
        processScrollingEvent();
    }
    if(scrolledToBottom)
    {
        processScrollEvent(MoveDirection::BOTTOM, false);
    }
    if(scrolledToTop)
    {
        processScrollEvent(MoveDirection::TOP, false);
    }
    if(scrolledToLeft)
    {
        processScrollEvent(MoveDirection::LEFT, false);
    }
    if(scrolledToRight)
    {
        processScrollEvent(MoveDirection::RIGHT, false);
    }
}

void ScrollView::scrollToBottom(float timeInSec, bool attenuated)
{
    startAutoScrollToDestination(Vec2(_innerContainer->getPosition().x, 0.0f), timeInSec, attenuated);
}

void ScrollView::scrollToTop(float timeInSec, bool attenuated)
{
    startAutoScrollToDestination(Vec2(_innerContainer->getPosition().x,
                                                _contentSize.height - _innerContainer->getContentSize().height), timeInSec, attenuated);
}

void ScrollView::scrollToLeft(float timeInSec, bool attenuated)
{
    startAutoScrollToDestination(Vec2(0.0f, _innerContainer->getPosition().y), timeInSec, attenuated);
}

void ScrollView::scrollToRight(float timeInSec, bool attenuated)
{
    startAutoScrollToDestination(Vec2(_contentSize.width - _innerContainer->getContentSize().width,
                                                _innerContainer->getPosition().y), timeInSec, attenuated);
}

void ScrollView::scrollToTopLeft(float timeInSec, bool attenuated)
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    startAutoScrollToDestination(Vec2(0.0f, _contentSize.height - _innerContainer->getContentSize().height), timeInSec, attenuated);
}

void ScrollView::scrollToTopRight(float timeInSec, bool attenuated)
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    startAutoScrollToDestination(Vec2(_contentSize.width - _innerContainer->getContentSize().width,
                                                _contentSize.height - _innerContainer->getContentSize().height), timeInSec, attenuated);
}

void ScrollView::scrollToBottomLeft(float timeInSec, bool attenuated)
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    startAutoScrollToDestination(Vec2::ZERO, timeInSec, attenuated);
}

void ScrollView::scrollToBottomRight(float timeInSec, bool attenuated)
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    startAutoScrollToDestination(Vec2(_contentSize.width - _innerContainer->getContentSize().width, 0.0f), timeInSec, attenuated);
}

void ScrollView::scrollToPercentVertical(float percent, float timeInSec, bool attenuated)
{
    float minY = _contentSize.height - _innerContainer->getContentSize().height;
    float h = - minY;
    startAutoScrollToDestination(Vec2(_innerContainer->getPosition().x, minY + percent * h / 100.0f), timeInSec, attenuated);
}

void ScrollView::scrollToPercentHorizontal(float percent, float timeInSec, bool attenuated)
{
    float w = _innerContainer->getContentSize().width - _contentSize.width;
    startAutoScrollToDestination(Vec2(-(percent * w / 100.0f), _innerContainer->getPosition().y), timeInSec, attenuated);
}

void ScrollView::scrollToPercentBothDirection(const Vec2& percent, float timeInSec, bool attenuated)
{
    if (_direction != Direction::BOTH)
    {
        return;
    }
    float minY = _contentSize.height - _innerContainer->getContentSize().height;
    float h = - minY;
    float w = _innerContainer->getContentSize().width - _contentSize.width;
    startAutoScrollToDestination(Vec2(-(percent.x * w / 100.0f), minY + percent.y * h / 100.0f), timeInSec, attenuated);
}

void ScrollView::jumpToBottom()
{
    jumpToDestination(Vec2(_innerContainer->getPosition().x, 0.0f));
}

void ScrollView::jumpToTop()
{
    jumpToDestination(Vec2(_innerContainer->getPosition().x,
                           _contentSize.height - _innerContainer->getContentSize().height));
}

void ScrollView::jumpToLeft()
{
    jumpToDestination(Vec2(0.0f, _innerContainer->getPosition().y));
}

void ScrollView::jumpToRight()
{
    jumpToDestination(Vec2(_contentSize.width - _innerContainer->getContentSize().width, _innerContainer->getPosition().y));
}

void ScrollView::jumpToTopLeft()
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    jumpToDestination(Vec2(0.0f, _contentSize.height - _innerContainer->getContentSize().height));
}

void ScrollView::jumpToTopRight()
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    jumpToDestination(Vec2(_contentSize.width - _innerContainer->getContentSize().width,
                           _contentSize.height - _innerContainer->getContentSize().height));
}

void ScrollView::jumpToBottomLeft()
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    jumpToDestination(Vec2::ZERO);
}

void ScrollView::jumpToBottomRight()
{
    if (_direction != Direction::BOTH)
    {
        CCLOG("Scroll direction is not both!");
        return;
    }
    jumpToDestination(Vec2(_contentSize.width - _innerContainer->getContentSize().width, 0.0f));
}

void ScrollView::jumpToPercentVertical(float percent)
{
    float minY = _contentSize.height - _innerContainer->getContentSize().height;
    float h = - minY;
    jumpToDestination(Vec2(_innerContainer->getPosition().x, minY + percent * h / 100.0f));
}

void ScrollView::jumpToPercentHorizontal(float percent)
{
    float w = _innerContainer->getContentSize().width - _contentSize.width;
    jumpToDestination(Vec2(-(percent * w / 100.0f), _innerContainer->getPosition().y));
}

void ScrollView::jumpToPercentBothDirection(const Vec2& percent)
{
    if (_direction != Direction::BOTH)
    {
        return;
    }
    float minY = _contentSize.height - _innerContainer->getContentSize().height;
    float h = - minY;
    float w = _innerContainer->getContentSize().width - _contentSize.width;
    jumpToDestination(Vec2(-(percent.x * w / 100.0f), minY + percent.y * h / 100.0f));
}

bool ScrollView::calculateCurrAndPrevTouchPoints(Touch* touch, Vec3* currPt, Vec3* prevPt)
{
    if (nullptr == _hittedByCamera ||
        false == hitTest(touch->getLocation(), _hittedByCamera, currPt) ||
        false == hitTest(touch->getPreviousLocation(), _hittedByCamera, prevPt))
    {
        return false;
    }
    return true;
}

void ScrollView::gatherTouchMove(const Vec2& delta)
{
    while(_touchMoveDisplacements.size() >= NUMBER_OF_GATHERED_TOUCHES_FOR_MOVE_SPEED)
    {
        _touchMoveDisplacements.pop_front();
        _touchMoveTimeDeltas.pop_front();
    }
    _touchMoveDisplacements.push_back(delta);
    
    long long timestamp = utils::getTimeInMilliseconds();
    _touchMoveTimeDeltas.push_back((timestamp - _touchMovePreviousTimestamp) / 1000.0f);
    _touchMovePreviousTimestamp = timestamp;
}

void ScrollView::handlePressLogic(Touch* /*touch*/)
{
    _bePressed = true;
    _autoScrolling = false;
    
    // Clear gathered touch move information
    {
        _touchMovePreviousTimestamp = utils::getTimeInMilliseconds();
        _touchMoveDisplacements.clear();
        _touchMoveTimeDeltas.clear();
    }
    
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->onTouchBegan();
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->onTouchBegan();
    }
}

void ScrollView::handleMoveLogic(Touch *touch)
{
    Vec3 currPt, prevPt;
    if(!calculateCurrAndPrevTouchPoints(touch, &currPt, &prevPt))
    {
        return;
    }
    Vec3 delta3 = currPt - prevPt;
    Vec2 delta(delta3.x, delta3.y);
    scrollChildren(delta);
    
    // Gather touch move information for speed calculation
    gatherTouchMove(delta);
}

void ScrollView::handleReleaseLogic(Touch *touch)
{
    // Gather the last touch information when released
    {
        Vec3 currPt, prevPt;
        if(calculateCurrAndPrevTouchPoints(touch, &currPt, &prevPt))
        {
            Vec3 delta3 = currPt - prevPt;
            Vec2 delta(delta3.x, delta3.y);
            gatherTouchMove(delta);
        }
    }

    _bePressed = false;
    
    bool bounceBackStarted = startBounceBackIfNeeded();
    if(!bounceBackStarted && _inertiaScrollEnabled)
    {
        Vec2 touchMoveVelocity = calculateTouchMoveVelocity();
        if(touchMoveVelocity != Vec2::ZERO)
        {
            startInertiaScroll(touchMoveVelocity);
        }
    }
    
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->onTouchEnded();
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->onTouchEnded();
    }
}

bool ScrollView::onTouchBegan(Touch *touch, Event *unusedEvent)
{
    bool pass = Layout::onTouchBegan(touch, unusedEvent);
    if (!_isInterceptTouch)
    {
        if (_hitted)
        {
            handlePressLogic(touch);
        }
    }
    return pass;
}

void ScrollView::onTouchMoved(Touch *touch, Event *unusedEvent)
{
    Layout::onTouchMoved(touch, unusedEvent);
    if (!_isInterceptTouch)
    {
        handleMoveLogic(touch);
    }
}

void ScrollView::onTouchEnded(Touch *touch, Event *unusedEvent)
{
    Layout::onTouchEnded(touch, unusedEvent);
    if (!_isInterceptTouch)
    {
        handleReleaseLogic(touch);
    }
    _isInterceptTouch = false;
}

void ScrollView::onTouchCancelled(Touch *touch, Event *unusedEvent)
{
    Layout::onTouchCancelled(touch, unusedEvent);
    if (!_isInterceptTouch)
    {
        handleReleaseLogic(touch);
    }
    _isInterceptTouch = false;
}

void ScrollView::update(float dt)
{
    if (_autoScrolling)
    {
        processAutoScrolling(dt);
    }
}

void ScrollView::interceptTouchEvent(Widget::TouchEventType event, Widget *sender,Touch* touch)
{
    if(!_touchEnabled)
    {
        Layout::interceptTouchEvent(event, sender, touch);
        return;
    }
    if(_direction == Direction::NONE)
        return;
    Vec2 touchPoint = touch->getLocation();
    switch (event)
    {
        case TouchEventType::BEGAN:
        {
            _isInterceptTouch = true;
            _touchBeganPosition = touch->getLocation();
            handlePressLogic(touch);
        }
        break;
        case TouchEventType::MOVED:
        {
            _touchMovePosition = touch->getLocation();
            // calculates move offset in points
            float offsetInInch = 0;
            switch (_direction)
            {
                case Direction::HORIZONTAL:
                    offsetInInch = convertDistanceFromPointToInch(Vec2(std::abs(sender->getTouchBeganPosition().x - touchPoint.x), 0));
                    break;
                case Direction::VERTICAL:
                    offsetInInch = convertDistanceFromPointToInch(Vec2(0, std::abs(sender->getTouchBeganPosition().y - touchPoint.y)));
                    break;
                case Direction::BOTH:
                    offsetInInch = convertDistanceFromPointToInch(sender->getTouchBeganPosition() - touchPoint);
                    break;
                default:
                    break;
            }
            if (offsetInInch > _childFocusCancelOffsetInInch)
            {
                sender->setHighlighted(false);
                handleMoveLogic(touch);
            }
        }
        break;

        case TouchEventType::CANCELED:
        case TouchEventType::ENDED:
        {
            _touchEndPosition = touch->getLocation();
            handleReleaseLogic(touch);
            if (sender->isSwallowTouches())
            {
                _isInterceptTouch = false;
            }
        }
        break;
    }
}

void ScrollView::processScrollEvent(MoveDirection dir, bool bounce)
{
    ScrollviewEventType scrollEventType;
    EventType eventType;
    switch(dir) {
        case MoveDirection::TOP:
        {
            scrollEventType = (bounce ? SCROLLVIEW_EVENT_BOUNCE_TOP : SCROLLVIEW_EVENT_SCROLL_TO_TOP);
            eventType = (bounce ? EventType::BOUNCE_TOP : EventType::SCROLL_TO_TOP);
            break;
        }
        case MoveDirection::BOTTOM:
        {
            scrollEventType = (bounce ? SCROLLVIEW_EVENT_BOUNCE_BOTTOM : SCROLLVIEW_EVENT_SCROLL_TO_BOTTOM);
            eventType = (bounce ? EventType::BOUNCE_BOTTOM : EventType::SCROLL_TO_BOTTOM);
            break;
        }
        case MoveDirection::LEFT:
        {
            scrollEventType = (bounce ? SCROLLVIEW_EVENT_BOUNCE_LEFT : SCROLLVIEW_EVENT_SCROLL_TO_LEFT);
            eventType = (bounce ? EventType::BOUNCE_LEFT : EventType::SCROLL_TO_LEFT);
            break;
        }
        case MoveDirection::RIGHT:
        {
            scrollEventType = (bounce ? SCROLLVIEW_EVENT_BOUNCE_RIGHT : SCROLLVIEW_EVENT_SCROLL_TO_RIGHT);
            eventType = (bounce ? EventType::BOUNCE_RIGHT : EventType::SCROLL_TO_RIGHT);
            break;
        }
    }
    dispatchEvent(scrollEventType, eventType);
}

void ScrollView::processScrollingEvent()
{
    dispatchEvent(SCROLLVIEW_EVENT_SCROLLING, EventType::SCROLLING);
}

void ScrollView::dispatchEvent(ScrollviewEventType scrollEventType, EventType eventType)
{
    this->retain();
    if (_scrollViewEventListener && _scrollViewEventSelector)
    {
        (_scrollViewEventListener->*_scrollViewEventSelector)(this, scrollEventType);
    }
    if (_eventCallback)
    {
        _eventCallback(this, eventType);
    }
    if (_ccEventCallback)
    {
        _ccEventCallback(this, static_cast<int>(eventType));
    }
    this->release();
}

void ScrollView::addEventListenerScrollView(Ref *target, SEL_ScrollViewEvent selector)
{
    _scrollViewEventListener = target;
    _scrollViewEventSelector = selector;
}

void ScrollView::addEventListener(const ccScrollViewCallback& callback)
{
    _eventCallback = callback;
}

void ScrollView::setDirection(Direction dir)
{
    _direction = dir;
    if(_scrollBarEnabled)
    {
        removeScrollBar();
        initScrollBar();
    }
}

ScrollView::Direction ScrollView::getDirection()const
{
    return _direction;
}

void ScrollView::setBounceEnabled(bool enabled)
{
    _bounceEnabled = enabled;
}

bool ScrollView::isBounceEnabled() const
{
    return _bounceEnabled;
}

void ScrollView::setInertiaScrollEnabled(bool enabled)
{
    _inertiaScrollEnabled = enabled;
}

bool ScrollView::isInertiaScrollEnabled() const
{
    return _inertiaScrollEnabled;
}

void ScrollView::setScrollBarEnabled(bool enabled)
{
    if(_scrollBarEnabled == enabled)
    {
        return;
    }
    
    if(_scrollBarEnabled)
    {
        removeScrollBar();
    }
    _scrollBarEnabled = enabled;
    if(_scrollBarEnabled)
    {
        initScrollBar();
    }
}

bool ScrollView::isScrollBarEnabled() const
{
    return _scrollBarEnabled;
}

void ScrollView::setScrollBarPositionFromCorner(const Vec2& positionFromCorner)
{
    if(_direction != Direction::HORIZONTAL)
    {
        setScrollBarPositionFromCornerForVertical(positionFromCorner);
    }
    if(_direction != Direction::VERTICAL)
    {
        setScrollBarPositionFromCornerForHorizontal(positionFromCorner);
    }
}

void ScrollView::setScrollBarPositionFromCornerForVertical(const Vec2& positionFromCorner)
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    CCASSERT(_direction != Direction::HORIZONTAL, "Scroll view doesn't have a vertical scroll bar!");
    _verticalScrollBar->setPositionFromCorner(positionFromCorner);
}

Vec2 ScrollView::getScrollBarPositionFromCornerForVertical() const
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    CCASSERT(_direction != Direction::HORIZONTAL, "Scroll view doesn't have a vertical scroll bar!");
    return _verticalScrollBar->getPositionFromCorner();
}

void ScrollView::setScrollBarPositionFromCornerForHorizontal(const Vec2& positionFromCorner)
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    CCASSERT(_direction != Direction::VERTICAL, "Scroll view doesn't have a horizontal scroll bar!");
    _horizontalScrollBar->setPositionFromCorner(positionFromCorner);
}

Vec2 ScrollView::getScrollBarPositionFromCornerForHorizontal() const
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    CCASSERT(_direction != Direction::VERTICAL, "Scroll view doesn't have a horizontal scroll bar!");
    return _horizontalScrollBar->getPositionFromCorner();
}

void ScrollView::setScrollBarWidth(float width)
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->setWidth(width);
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->setWidth(width);
    }
}

float ScrollView::getScrollBarWidth() const
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        return _verticalScrollBar->getWidth();
    }
    else if(_horizontalScrollBar != nullptr)
    {
        return _horizontalScrollBar->getWidth();
    }
    return 0;
}

void ScrollView::setScrollBarColor(const Color3B& color)
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->setColor(color);
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->setColor(color);
    }
}

const Color3B& ScrollView::getScrollBarColor() const
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        return _verticalScrollBar->getColor();
    }
    else if(_horizontalScrollBar != nullptr)
    {
        return _horizontalScrollBar->getColor();
    }
    return Color3B::WHITE;
}

void ScrollView::setScrollBarOpacity(GLubyte opacity)
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->setOpacity(opacity);
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->setOpacity(opacity);
    }
}

GLubyte ScrollView::getScrollBarOpacity() const
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        return _verticalScrollBar->getOpacity();
    }
    else if(_horizontalScrollBar != nullptr)
    {
        return _horizontalScrollBar->getOpacity();
    }
    return -1;
}

void ScrollView::setScrollBarAutoHideEnabled(bool autoHideEnabled)
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->setAutoHideEnabled(autoHideEnabled);
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->setAutoHideEnabled(autoHideEnabled);
    }
}

bool ScrollView::isScrollBarAutoHideEnabled() const
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        return _verticalScrollBar->isAutoHideEnabled();
    }
    else if(_horizontalScrollBar != nullptr)
    {
        return _horizontalScrollBar->isAutoHideEnabled();
    }
    return false;
}

void ScrollView::setScrollBarAutoHideTime(float autoHideTime)
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        _verticalScrollBar->setAutoHideTime(autoHideTime);
    }
    if(_horizontalScrollBar != nullptr)
    {
        _horizontalScrollBar->setAutoHideTime(autoHideTime);
    }
}
    
float ScrollView::getScrollBarAutoHideTime() const
{
    CCASSERT(_scrollBarEnabled, "Scroll bar should be enabled!");
    if(_verticalScrollBar != nullptr)
    {
        return _verticalScrollBar->getAutoHideTime();
    }
    else if(_horizontalScrollBar != nullptr)
    {
        return _horizontalScrollBar->getAutoHideTime();
    }
    return 0;
}
    
void ScrollView::setTouchTotalTimeThreshold(float touchTotalTimeThreshold)
{
    _touchTotalTimeThreshold = touchTotalTimeThreshold;
}

float ScrollView::getTouchTotalTimeThreshold() const
{
    return _touchTotalTimeThreshold;
}

Layout* ScrollView::getInnerContainer()const
{
    return _innerContainer;
}

void ScrollView::setLayoutType(Type type)
{
    _innerContainer->setLayoutType(type);
}

Layout::Type ScrollView::getLayoutType() const
{
    return _innerContainer->getLayoutType();
}

void ScrollView::doLayout()
{
    if (!_doLayoutDirty)
    {
        return;
    }
    _doLayoutDirty = false;
}

std::string ScrollView::getDescription() const
{
    return "ScrollView";
}

Widget* ScrollView::createCloneInstance()
{
    return ScrollView::create();
}

void ScrollView::copyClonedWidgetChildren(Widget* model)
{
    Layout::copyClonedWidgetChildren(model);
}

void ScrollView::copySpecialProperties(Widget *widget)
{
    ScrollView* scrollView = dynamic_cast<ScrollView*>(widget);
    if (scrollView)
    {
        Layout::copySpecialProperties(widget);
        setDirection(scrollView->_direction);
        setInnerContainerPosition(scrollView->getInnerContainerPosition());
        setInnerContainerSize(scrollView->getInnerContainerSize());
        _topBoundary = scrollView->_topBoundary;
        _bottomBoundary = scrollView->_bottomBoundary;
        _leftBoundary = scrollView->_leftBoundary;
        _rightBoundary = scrollView->_rightBoundary;
        _bePressed = scrollView->_bePressed;
        _childFocusCancelOffsetInInch = scrollView->_childFocusCancelOffsetInInch;
        _touchMoveDisplacements = scrollView->_touchMoveDisplacements;
        _touchMoveTimeDeltas = scrollView->_touchMoveTimeDeltas;
        _touchMovePreviousTimestamp = scrollView->_touchMovePreviousTimestamp;
        _autoScrolling = scrollView->_autoScrolling;
        _autoScrollAttenuate = scrollView->_autoScrollAttenuate;
        _autoScrollStartPosition = scrollView->_autoScrollStartPosition;
        _autoScrollTargetDelta = scrollView->_autoScrollTargetDelta;
        _autoScrollTotalTime = scrollView->_autoScrollTotalTime;
        _autoScrollAccumulatedTime = scrollView->_autoScrollAccumulatedTime;
        _autoScrollCurrentlyOutOfBoundary = scrollView->_autoScrollCurrentlyOutOfBoundary;
        _autoScrollBraking = scrollView->_autoScrollBraking;
        _autoScrollBrakingStartPosition = scrollView->_autoScrollBrakingStartPosition;
        setInertiaScrollEnabled(scrollView->_inertiaScrollEnabled);
        setBounceEnabled(scrollView->_bounceEnabled);
        _scrollViewEventListener = scrollView->_scrollViewEventListener;
        _scrollViewEventSelector = scrollView->_scrollViewEventSelector;
        _eventCallback = scrollView->_eventCallback;
        _ccEventCallback = scrollView->_ccEventCallback;
        
        setScrollBarEnabled(scrollView->isScrollBarEnabled());
        if(isScrollBarEnabled())
        {
            if(_direction != Direction::HORIZONTAL)
            {
                setScrollBarPositionFromCornerForVertical(scrollView->getScrollBarPositionFromCornerForVertical());
            }
            if(_direction != Direction::VERTICAL)
            {
                setScrollBarPositionFromCornerForHorizontal(scrollView->getScrollBarPositionFromCornerForHorizontal());
            }
            setScrollBarWidth(scrollView->getScrollBarWidth());
            setScrollBarColor(scrollView->getScrollBarColor());
            setScrollBarAutoHideEnabled(scrollView->isScrollBarAutoHideEnabled());
            setScrollBarAutoHideTime(scrollView->getScrollBarAutoHideTime());
        }
    }
}

void ScrollView::initScrollBar()
{
    if(_direction != Direction::HORIZONTAL && _verticalScrollBar == nullptr)
    {
        _verticalScrollBar = ScrollViewBar::create(this, Direction::VERTICAL);
        addProtectedChild(_verticalScrollBar, 2);
    }
    if(_direction != Direction::VERTICAL && _horizontalScrollBar == nullptr)
    {
        _horizontalScrollBar = ScrollViewBar::create(this, Direction::HORIZONTAL);
        addProtectedChild(_horizontalScrollBar, 2);
    }
}

void ScrollView::removeScrollBar()
{
    if(_verticalScrollBar != nullptr)
    {
        removeProtectedChild(_verticalScrollBar);
        _verticalScrollBar = nullptr;
    }
    if(_horizontalScrollBar != nullptr)
    {
        removeProtectedChild(_horizontalScrollBar);
        _horizontalScrollBar = nullptr;
    }
}

Widget* ScrollView::findNextFocusedWidget(cocos2d::ui::Widget::FocusDirection direction, cocos2d::ui::Widget *current)
{
    if (this->getLayoutType() == Layout::Type::VERTICAL
        || this->getLayoutType() == Layout::Type::HORIZONTAL)
    {
        return _innerContainer->findNextFocusedWidget(direction, current);
    }
    else
    {
        return Widget::findNextFocusedWidget(direction, current);
    }
}
}

NS_CC_END