//  CCScrollLayer.cpp

//  Museum

//

//  Created by GParvaneh on 29/12/2010.

//  Copyright 2010. All rights reserved.

//  Ported to C++ by Lior Tamam on 03/04/2011

#include "CCScrollLayer.h"

CCScrollLayer* CCScrollLayer::layerWithLayers(CCMutableArray<CCLayer*> *layers, int widthOffset)

{        

        CCScrollLayer *pRet = new CCScrollLayer();

        if (pRet && pRet->initWithLayers(layers, widthOffset))

        {

                pRet->autorelease();

                return pRet;

        }

        CC_SAFE_DELETE(pRet)

        return NULL;

}

bool CCScrollLayer::initWithLayers(CCMutableArray<CCLayer*> *layers, int widthOffset)

{        

        if (CCLayer::init())

        {                

                // Make sure the layer accepts touches

                CCTouchDispatcher::sharedDispatcher()->addTargetedDelegate(this,0,true);

                // Set up the starting variables

                if(!widthOffset)

                {

                        widthOffset = 0;

                }        

                currentScreen = 1;

                // offset added to show preview of next/previous screens

                scrollWidth  = (int)CCDirector::sharedDirector()->getWinSize().width - widthOffset;

                scrollHeight = (int)CCDirector::sharedDirector()->getWinSize().height;

                startWidth = scrollWidth;

                startHeight = scrollHeight;

                // Loop through the array and add the screens

                unsigned int i;

                for (i=0; i<layers->count(); i++)

                {

                        CCLayer* l = layers->getObjectAtIndex(i);

                        l->setAnchorPoint(ccp(0,0));

                        l->setPosition(ccp((i*scrollWidth),0));

                        addChild(l);                        

                }

                // Setup a count of the available screens

                totalScreens = layers->count();

                return true;        

        }

        else

        {

                return false;

        }        

}

void CCScrollLayer::moveToPage(int page)

{        

        CCEaseBounce* changePage = CCEaseBounce::actionWithAction(CCMoveTo::actionWithDuration(0.3f, ccp(-((page-1)*scrollWidth),0)));

        this->runAction(changePage);

        currentScreen = page;        

}

void CCScrollLayer::moveToNextPage()

{        

        CCEaseBounce* changePage = CCEaseBounce::actionWithAction(CCMoveTo::actionWithDuration(0.3f, ccp(-(((currentScreen+1)-1)*scrollWidth),0)));

        this->runAction(changePage);

        currentScreen = currentScreen+1;        

}

void CCScrollLayer::moveToPreviousPage()

{        

        CCEaseBounce* changePage =CCEaseBounce::actionWithAction(CCMoveTo::actionWithDuration(0.3f, ccp(-(((currentScreen-1)-1)*scrollWidth),0)));

        this->runAction(changePage);

        currentScreen = currentScreen-1;        

}

void CCScrollLayer::onExit()

{

        CCTouchDispatcher::sharedDispatcher()->removeDelegate(this);

        CCLayer::onExit();

}

bool CCScrollLayer::ccTouchBegan(CCTouch *touch, CCEvent *withEvent)

{

        CCPoint touchPoint = touch->locationInView(touch->view());

        touchPoint = CCDirector::sharedDirector()->convertToGL(touchPoint);

        startSwipe = (int)touchPoint.x;

        return true;

}

void CCScrollLayer::ccTouchMoved(CCTouch *touch, CCEvent *withEvent)

{        

        CCPoint touchPoint = touch->locationInView(touch->view());

        touchPoint = CCDirector::sharedDirector()->convertToGL(touchPoint);

        this->setPosition(ccp((-(currentScreen-1)*scrollWidth)+(touchPoint.x-startSwipe),0));

}

void CCScrollLayer::ccTouchEnded(CCTouch *touch, CCEvent *withEvent)

{

        CCPoint touchPoint = touch->locationInView(touch->view());

        touchPoint = CCDirector::sharedDirector()->convertToGL(touchPoint);

        int newX = (int)touchPoint.x;

        if ( (newX - startSwipe) < -scrollWidth / 3 && (currentScreen+1) <= totalScreens )

        {

                this->moveToNextPage();

        }

        else if ( (newX - startSwipe) > scrollWidth / 3 && (currentScreen-1) > 0 )

        {

                this->moveToPreviousPage();

        }

        else

        {

                this->moveToPage(currentScreen);                

        }                

}