android/sdk/src/main/java/com/taobao/weex/ui/component/WXSliderNeighbor.java - incubator-weex - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
  */
 package com.taobao.weex.ui.component;

 import android.content.Context;
 import android.support.annotation.NonNull;
 import android.support.v4.view.ViewPager;
 import android.text.TextUtils;
 import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;

 import com.taobao.weex.WXSDKInstance;
 import com.taobao.weex.common.WXThread;
 import com.taobao.weex.ui.ComponentCreator;
 import com.taobao.weex.ui.action.BasicComponentData;
 import com.taobao.weex.ui.view.WXCircleIndicator;
 import com.taobao.weex.ui.view.WXCirclePageAdapter;
 import com.taobao.weex.ui.view.WXCircleViewPager;
 import com.taobao.weex.utils.WXUtils;
 import com.taobao.weex.utils.WXViewUtils;

 import java.lang.reflect.InvocationTargetException;
 import java.util.List;

 /**
  * Known Issus: In auto play mode, neighbor view not scaled or aplhaed rarely.
  *
  * Created by xingjiu on 16/8/18.
  */
 public class WXSliderNeighbor extends WXSlider {
     public static final String NEIGHBOR_SCALE = "neighborScale"; // the init scale of neighbor page
     public static final String NEIGHBOR_ALPHA = "neighborAlpha"; // the init alpha of neighbor page
     public static final String NEIGHBOR_SPACE = "neighborSpace"; // the init space of neighbor page
     public static final String CURRENT_ITEM_SCALE = "currentItemScale"; // the scale of middle item

     private static final int DEFAULT_NEIGHBOR_SPACE = 25;
     private static final float DEFAULT_NEIGHBOR_SCALE = 0.8F;
     private static final float DEFAULT_NEIGHBOR_ALPHA = 0.6F;
     private static final float DEFAULT_CURRENT_ITEM_SCALE = 0.9F;

     private float mNeighborScale = DEFAULT_NEIGHBOR_SCALE;
     private float mNeighborAlpha = DEFAULT_NEIGHBOR_ALPHA;
     private float mNeighborSpace = DEFAULT_NEIGHBOR_SPACE;
     private float mCurrentItemScale = DEFAULT_CURRENT_ITEM_SCALE;

     private ZoomTransformer mCachedTransformer;

     public WXSliderNeighbor(WXSDKInstance instance, WXVContainer parent, BasicComponentData basicComponentData) {
         super(instance, parent, basicComponentData);
     }

     public static class Creator implements ComponentCreator {
         public WXComponent createInstance(WXSDKInstance instance, WXVContainer parent, BasicComponentData basicComponentData) throws IllegalAccessException, InvocationTargetException, InstantiationException {
             return new WXSliderNeighbor(instance, parent, basicComponentData);
         }
     }

     @Override
     public void bindData(WXComponent component) {
         super.bindData(component);
     }

     @Override
     protected FrameLayout initComponentHostView(@NonNull Context context) {
         FrameLayout view = new FrameLayout(context);

         // init view pager
         FrameLayout.LayoutParams pagerParams = new FrameLayout.LayoutParams(
                 FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
         pagerParams.gravity = Gravity.CENTER;
         mViewPager = new WXCircleViewPager(getContext());
         mViewPager.setLayoutParams(pagerParams);

         // init adapter
         mAdapter = new WXCirclePageAdapter();
         mViewPager.setAdapter(mAdapter);

         // add to parent
         view.addView(mViewPager);
         mViewPager.addOnPageChangeListener(mPageChangeListener);

         mViewPager.setOverScrollMode(View.OVER_SCROLL_NEVER);
         registerActivityStateListener();

         mViewPager.setPageTransformer(false, createTransformer());

         return view;
     }

     ZoomTransformer createTransformer() {
         if(mCachedTransformer == null) {
             mCachedTransformer = new ZoomTransformer();
         }
         return mCachedTransformer;
     }

     @Override
     public void addSubView(View view, final int index) {
         if (view == null || mAdapter == null) {
             return;
         }

         if (view instanceof WXCircleIndicator) {
             return;
         }

         FrameLayout wrapper = new FrameLayout(getContext());
         FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
         params.gravity = Gravity.CENTER;
         view.setLayoutParams(params);
         wrapper.addView(view);
         super.addSubView(wrapper,index);

         updateAdapterScaleAndAlpha(mNeighborAlpha, mNeighborScale); // we need to set neighbor view status when added.

         mViewPager.postDelayed(WXThread.secure(new Runnable() {
             @Override
             public void run() {
                 try {
                     if(mViewPager.getRealCount() > 0 && index > 2) { // index > 2 mean more than two times, then need a fake drag
                         // prevent a bug of init status. ZoomTransformer no called as excepted.
                         mViewPager.beginFakeDrag();
                         mViewPager.fakeDragBy(1); // must be 1
                     }
                 }catch (IndexOutOfBoundsException e){
                     // do nothing
                 } finally {
                     try {
                         mViewPager.endFakeDrag();
                     }catch (Exception e) {
                         // do nothing
                     }
                 }
             }
         }), 50);
     }

     private void updateScaleAndAlpha(View view, float alpha, float scale) {
         if(null == view) {
             return;
         }
         if(alpha >= 0 && view.getAlpha() != alpha) {
             view.setAlpha(alpha);
         }
         if(scale >= 0 && view.getScaleX() != scale) {
             view.setScaleX(scale);
             view.setScaleY(scale);
         }
     }

     private void updateAdapterScaleAndAlpha(final float alpha, final float scale) {
         final List<View> pageViews = mAdapter.getViews();
         final int curPos = mViewPager.getCurrentItem();

         if(pageViews.size() > 0) {
             final View currentPage = pageViews.get(curPos);
             updateScaleAndAlpha(((ViewGroup)currentPage).getChildAt(0), 1.0F, mCurrentItemScale);

             if(pageViews.size() < 2) {
                 return;
             }
             //make sure View's width & height are measured.
             currentPage.postDelayed(WXThread.secure(new Runnable() {
                 @Override
                 public void run() {
                     //change left and right page's translation
                     updateNeighbor(currentPage, alpha, scale);

                 }
             }), 17);

             // make sure only display view current, left, right.
             int left = (curPos == 0) ? pageViews.size()-1 : curPos-1;
             int right = (curPos == pageViews.size()-1) ? 0 : curPos+1;
             for(int i =0; i<mAdapter.getRealCount(); i++) {
                 if(i != left && i != curPos && i != right) {
                     ((ViewGroup)pageViews.get(i)).getChildAt(0).setAlpha(0F);
                 }
             }
         }
     }

     private void updateNeighbor(View currentPage, final float alpha, final float scale) {
         final List<View> pageViews = mAdapter.getViews();
         final int curPos = mViewPager.getCurrentItem();

         float translation = calculateTranslation(currentPage);
         int left = (curPos == 0) ? pageViews.size()-1 : curPos-1;
         View leftPage = pageViews.get(left);
         int right = (curPos == pageViews.size()-1) ? 0 : curPos+1;
         View rightPage = pageViews.get(right);

         if(pageViews.size() == 2) {
             if(curPos == 0) {
                 moveRight(rightPage, translation, alpha, scale);
             }else if(curPos == 1) {
                 moveLeft(leftPage, translation, alpha, scale);
             }
         } else {
             moveLeft(leftPage, translation, alpha, scale);
             moveRight(rightPage, translation, alpha, scale);
         }
     }

     private void moveLeft(View page, float translation, float alpha, float scale) {
         updateScaleAndAlpha(((ViewGroup)page).getChildAt(0), alpha, scale);
         page.setTranslationX(translation);
         ((ViewGroup)page).getChildAt(0).setTranslationX(translation);
     }
     private void moveRight(View page, float translation, float alpha, float scale) {
         moveLeft(page, -translation, alpha, scale);
     }

     @WXComponentProp(name = NEIGHBOR_SCALE)
     public void setNeighborScale(String input) {
         float neighborScale = DEFAULT_NEIGHBOR_SCALE;
         if (!TextUtils.isEmpty(input)) {
             try {
                 neighborScale = Float.parseFloat(input);
             } catch (NumberFormatException e) {
             }
         }

         // addSubView is called before setProperty, so we need to modify the neighbor view in mAdapter.
         if(this.mNeighborScale != neighborScale) {
             this.mNeighborScale = neighborScale;
             updateAdapterScaleAndAlpha(-1, neighborScale);
         }
     }

     @WXComponentProp(name = NEIGHBOR_ALPHA)
     public void setNeighborAlpha(String input) {
         float neighborAlpha = DEFAULT_NEIGHBOR_ALPHA;
         if (!TextUtils.isEmpty(input)) {
             try {
                 neighborAlpha = Float.parseFloat(input);
             } catch (NumberFormatException e) {
             }
         }

         // The same work as setNeighborScale()
         if(this.mNeighborAlpha != neighborAlpha) {
             this.mNeighborAlpha = neighborAlpha;
             updateAdapterScaleAndAlpha(neighborAlpha, -1);
         }
     }

     @WXComponentProp(name = NEIGHBOR_SPACE)
     @SuppressWarnings("unused")
     public void setNeighborSpace(String input) {
         float neighborSpace = DEFAULT_NEIGHBOR_SPACE;
         if (!TextUtils.isEmpty(input)) {
             try {
                 neighborSpace = Float.parseFloat(input);
             } catch (NumberFormatException e) {
             }
         }

         if(this.mNeighborSpace != neighborSpace) {
             this.mNeighborSpace = neighborSpace;
         }
     }

     @WXComponentProp(name = CURRENT_ITEM_SCALE)
     @SuppressWarnings("unused")
     public void setCurrentItemScale(String input) {
         float currentItemScale = DEFAULT_CURRENT_ITEM_SCALE;
         if (!TextUtils.isEmpty(input)) {
             try {
                 currentItemScale = Float.parseFloat(input);
             } catch (NumberFormatException e) {
             }
         }

         if(this.mCurrentItemScale != currentItemScale) {
             this.mCurrentItemScale = currentItemScale;
             updateAdapterScaleAndAlpha(-1, -1);
         }
     }

     @Override
     protected boolean setProperty(String key, Object param) {
         String input;
         switch (key) {
             case NEIGHBOR_SCALE:
                 input = WXUtils.getString(param, null);
                 if (input != null) {
                     setNeighborScale(input);
                 }
                 return true;
             case NEIGHBOR_ALPHA:
                 input = WXUtils.getString(param, null);
                 if (input != null) {
                     setNeighborAlpha(input);
                 }
                 return true;
             case NEIGHBOR_SPACE:
                 input = WXUtils.getString(param, null);
                 if (input != null) {
                     setNeighborSpace(input);
                 }
                 return true;
             case CURRENT_ITEM_SCALE:
                 input = WXUtils.getString(param, null);
                 if (input != null) {
                     setCurrentItemScale(input);
                 }
                 return true;
         }
         return super.setProperty(key, param);
     }

     /**
      * we need add translation for left and right card view.
      * */
     private float calculateTranslation(@NonNull View hostPage) {
         if(!(hostPage instanceof ViewGroup)) {
             return 0;
         }
         View realView = ((ViewGroup)hostPage).getChildAt(0);
         float translation = (hostPage.getMeasuredWidth()-realView.getMeasuredWidth()*mNeighborScale)/4;
         translation += ((hostPage.getMeasuredWidth()-realView.getMeasuredWidth() * mCurrentItemScale)/2 - WXViewUtils.getRealPxByWidth(mNeighborSpace, getInstance().getInstanceViewPortWidth()))/2 ;
         return translation;
     }

     // Here is the trick.
      class ZoomTransformer implements ViewPager.PageTransformer {
         @Override
         public void transformPage(View page, float position) {
             int pagePosition = mAdapter.getPagePosition(page);
             int curPosition = mViewPager.getCurrentItem();

             int realCount = mAdapter.getRealCount();

             boolean ignore = false;
             if(curPosition != 0 && curPosition != realCount - 1 && Math.abs(pagePosition - curPosition) > 1)  {
                 ignore = true;
             }
             if(curPosition == 0 && pagePosition < realCount - 1 && pagePosition > 1) {
                 ignore = true;
             }
             if(curPosition == realCount - 1 && pagePosition < realCount - 2 && pagePosition > 0) {
                 ignore = true;
             }
             // just transfer the neighbor(left & right) page.
             if(ignore) {
                 return;
             }

             View realView = ((ViewGroup)page).getChildAt(0);
             if(realView == null){
                 return;
             }
             float alpha, scale;

             if(position <= (-realCount + 1)) {
                 position = position + realCount;
             }
             if(position >= realCount - 1) {
                 position = position - realCount;
             }

             if (position >= -1 && position <= 1) {
                 float factor = Math.abs(Math.abs(position) - 1);
                 scale = mNeighborScale + factor * (mCurrentItemScale - mNeighborScale);
                 alpha = (1- mNeighborAlpha) * factor + mNeighborAlpha;

                 float translation = calculateTranslation(page);
                 if(position > 0){
                     translation = (position*translation);
                     realView.setTranslationX(-translation);
                     page.setTranslationX(-translation);
                 }else if(position == 0){
                     page.setTranslationX(0);
                     realView.setTranslationX(0);
                     updateAdapterScaleAndAlpha(mNeighborAlpha, mNeighborScale);
                 }else{
                     if(realCount == 2 && Math.abs(position) == 1) {
                         return;
                     }
                     translation = (-position*translation);
                     realView.setTranslationX(translation);
                     page.setTranslationX(translation);
                 }
                 realView.setScaleX(scale);
                 realView.setScaleY(scale);
                 realView.setAlpha(alpha);
             }

         }
     }

 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing,
	* software distributed under the License is distributed on an
	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the
	* specific language governing permissions and limitations
	* under the License.
	*/
	package com.taobao.weex.ui.component;

	import android.content.Context;
	import android.support.annotation.NonNull;
	import android.support.v4.view.ViewPager;
	import android.text.TextUtils;
	import android.view.Gravity;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.FrameLayout;

	import com.taobao.weex.WXSDKInstance;
	import com.taobao.weex.common.WXThread;
	import com.taobao.weex.ui.ComponentCreator;
	import com.taobao.weex.ui.action.BasicComponentData;
	import com.taobao.weex.ui.view.WXCircleIndicator;
	import com.taobao.weex.ui.view.WXCirclePageAdapter;
	import com.taobao.weex.ui.view.WXCircleViewPager;
	import com.taobao.weex.utils.WXUtils;
	import com.taobao.weex.utils.WXViewUtils;

	import java.lang.reflect.InvocationTargetException;
	import java.util.List;

	/**
	* Known Issus: In auto play mode, neighbor view not scaled or aplhaed rarely.
	*
	* Created by xingjiu on 16/8/18.
	*/
	public class WXSliderNeighbor extends WXSlider {
	public static final String NEIGHBOR_SCALE = "neighborScale"; // the init scale of neighbor page
	public static final String NEIGHBOR_ALPHA = "neighborAlpha"; // the init alpha of neighbor page
	public static final String NEIGHBOR_SPACE = "neighborSpace"; // the init space of neighbor page
	public static final String CURRENT_ITEM_SCALE = "currentItemScale"; // the scale of middle item

	private static final int DEFAULT_NEIGHBOR_SPACE = 25;
	private static final float DEFAULT_NEIGHBOR_SCALE = 0.8F;
	private static final float DEFAULT_NEIGHBOR_ALPHA = 0.6F;
	private static final float DEFAULT_CURRENT_ITEM_SCALE = 0.9F;

	private float mNeighborScale = DEFAULT_NEIGHBOR_SCALE;
	private float mNeighborAlpha = DEFAULT_NEIGHBOR_ALPHA;
	private float mNeighborSpace = DEFAULT_NEIGHBOR_SPACE;
	private float mCurrentItemScale = DEFAULT_CURRENT_ITEM_SCALE;

	private ZoomTransformer mCachedTransformer;

	public WXSliderNeighbor(WXSDKInstance instance, WXVContainer parent, BasicComponentData basicComponentData) {
	super(instance, parent, basicComponentData);
	}

	public static class Creator implements ComponentCreator {
	public WXComponent createInstance(WXSDKInstance instance, WXVContainer parent, BasicComponentData basicComponentData) throws IllegalAccessException, InvocationTargetException, InstantiationException {
	return new WXSliderNeighbor(instance, parent, basicComponentData);
	}
	}

	@Override
	public void bindData(WXComponent component) {
	super.bindData(component);
	}

	@Override
	protected FrameLayout initComponentHostView(@NonNull Context context) {
	FrameLayout view = new FrameLayout(context);

	// init view pager
	FrameLayout.LayoutParams pagerParams = new FrameLayout.LayoutParams(
	FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
	pagerParams.gravity = Gravity.CENTER;
	mViewPager = new WXCircleViewPager(getContext());
	mViewPager.setLayoutParams(pagerParams);

	// init adapter
	mAdapter = new WXCirclePageAdapter();
	mViewPager.setAdapter(mAdapter);

	// add to parent
	view.addView(mViewPager);
	mViewPager.addOnPageChangeListener(mPageChangeListener);

	mViewPager.setOverScrollMode(View.OVER_SCROLL_NEVER);
	registerActivityStateListener();

	mViewPager.setPageTransformer(false, createTransformer());

	return view;
	}

	ZoomTransformer createTransformer() {
	if(mCachedTransformer == null) {
	mCachedTransformer = new ZoomTransformer();
	}
	return mCachedTransformer;
	}

	@Override
	public void addSubView(View view, final int index) {
	if (view == null \|\| mAdapter == null) {
	return;
	}

	if (view instanceof WXCircleIndicator) {
	return;
	}

	FrameLayout wrapper = new FrameLayout(getContext());
	FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
	params.gravity = Gravity.CENTER;
	view.setLayoutParams(params);
	wrapper.addView(view);
	super.addSubView(wrapper,index);

	updateAdapterScaleAndAlpha(mNeighborAlpha, mNeighborScale); // we need to set neighbor view status when added.

	mViewPager.postDelayed(WXThread.secure(new Runnable() {
	@Override
	public void run() {
	try {
	if(mViewPager.getRealCount() > 0 && index > 2) { // index > 2 mean more than two times, then need a fake drag
	// prevent a bug of init status. ZoomTransformer no called as excepted.
	mViewPager.beginFakeDrag();
	mViewPager.fakeDragBy(1); // must be 1
	}
	}catch (IndexOutOfBoundsException e){
	// do nothing
	} finally {
	try {
	mViewPager.endFakeDrag();
	}catch (Exception e) {
	// do nothing
	}
	}
	}
	}), 50);
	}

	private void updateScaleAndAlpha(View view, float alpha, float scale) {
	if(null == view) {
	return;
	}
	if(alpha >= 0 && view.getAlpha() != alpha) {
	view.setAlpha(alpha);
	}
	if(scale >= 0 && view.getScaleX() != scale) {
	view.setScaleX(scale);
	view.setScaleY(scale);
	}
	}

	private void updateAdapterScaleAndAlpha(final float alpha, final float scale) {
	final List<View> pageViews = mAdapter.getViews();
	final int curPos = mViewPager.getCurrentItem();

	if(pageViews.size() > 0) {
	final View currentPage = pageViews.get(curPos);
	updateScaleAndAlpha(((ViewGroup)currentPage).getChildAt(0), 1.0F, mCurrentItemScale);

	if(pageViews.size() < 2) {
	return;
	}
	//make sure View's width & height are measured.
	currentPage.postDelayed(WXThread.secure(new Runnable() {
	@Override
	public void run() {
	//change left and right page's translation
	updateNeighbor(currentPage, alpha, scale);

	}
	}), 17);

	// make sure only display view current, left, right.
	int left = (curPos == 0) ? pageViews.size()-1 : curPos-1;
	int right = (curPos == pageViews.size()-1) ? 0 : curPos+1;
	for(int i =0; i<mAdapter.getRealCount(); i++) {
	if(i != left && i != curPos && i != right) {
	((ViewGroup)pageViews.get(i)).getChildAt(0).setAlpha(0F);
	}
	}
	}
	}

	private void updateNeighbor(View currentPage, final float alpha, final float scale) {
	final List<View> pageViews = mAdapter.getViews();
	final int curPos = mViewPager.getCurrentItem();

	float translation = calculateTranslation(currentPage);
	int left = (curPos == 0) ? pageViews.size()-1 : curPos-1;
	View leftPage = pageViews.get(left);
	int right = (curPos == pageViews.size()-1) ? 0 : curPos+1;
	View rightPage = pageViews.get(right);

	if(pageViews.size() == 2) {
	if(curPos == 0) {
	moveRight(rightPage, translation, alpha, scale);
	}else if(curPos == 1) {
	moveLeft(leftPage, translation, alpha, scale);
	}
	} else {
	moveLeft(leftPage, translation, alpha, scale);
	moveRight(rightPage, translation, alpha, scale);
	}
	}

	private void moveLeft(View page, float translation, float alpha, float scale) {
	updateScaleAndAlpha(((ViewGroup)page).getChildAt(0), alpha, scale);
	page.setTranslationX(translation);
	((ViewGroup)page).getChildAt(0).setTranslationX(translation);
	}
	private void moveRight(View page, float translation, float alpha, float scale) {
	moveLeft(page, -translation, alpha, scale);
	}

	@WXComponentProp(name = NEIGHBOR_SCALE)
	public void setNeighborScale(String input) {
	float neighborScale = DEFAULT_NEIGHBOR_SCALE;
	if (!TextUtils.isEmpty(input)) {
	try {
	neighborScale = Float.parseFloat(input);
	} catch (NumberFormatException e) {
	}
	}

	// addSubView is called before setProperty, so we need to modify the neighbor view in mAdapter.
	if(this.mNeighborScale != neighborScale) {
	this.mNeighborScale = neighborScale;
	updateAdapterScaleAndAlpha(-1, neighborScale);
	}
	}

	@WXComponentProp(name = NEIGHBOR_ALPHA)
	public void setNeighborAlpha(String input) {
	float neighborAlpha = DEFAULT_NEIGHBOR_ALPHA;
	if (!TextUtils.isEmpty(input)) {
	try {
	neighborAlpha = Float.parseFloat(input);
	} catch (NumberFormatException e) {
	}
	}

	// The same work as setNeighborScale()
	if(this.mNeighborAlpha != neighborAlpha) {
	this.mNeighborAlpha = neighborAlpha;
	updateAdapterScaleAndAlpha(neighborAlpha, -1);
	}
	}

	@WXComponentProp(name = NEIGHBOR_SPACE)
	@SuppressWarnings("unused")
	public void setNeighborSpace(String input) {
	float neighborSpace = DEFAULT_NEIGHBOR_SPACE;
	if (!TextUtils.isEmpty(input)) {
	try {
	neighborSpace = Float.parseFloat(input);
	} catch (NumberFormatException e) {
	}
	}

	if(this.mNeighborSpace != neighborSpace) {
	this.mNeighborSpace = neighborSpace;
	}
	}

	@WXComponentProp(name = CURRENT_ITEM_SCALE)
	@SuppressWarnings("unused")
	public void setCurrentItemScale(String input) {
	float currentItemScale = DEFAULT_CURRENT_ITEM_SCALE;
	if (!TextUtils.isEmpty(input)) {
	try {
	currentItemScale = Float.parseFloat(input);
	} catch (NumberFormatException e) {
	}
	}

	if(this.mCurrentItemScale != currentItemScale) {
	this.mCurrentItemScale = currentItemScale;
	updateAdapterScaleAndAlpha(-1, -1);
	}
	}

	@Override
	protected boolean setProperty(String key, Object param) {
	String input;
	switch (key) {
	case NEIGHBOR_SCALE:
	input = WXUtils.getString(param, null);
	if (input != null) {
	setNeighborScale(input);
	}
	return true;
	case NEIGHBOR_ALPHA:
	input = WXUtils.getString(param, null);
	if (input != null) {
	setNeighborAlpha(input);
	}
	return true;
	case NEIGHBOR_SPACE:
	input = WXUtils.getString(param, null);
	if (input != null) {
	setNeighborSpace(input);
	}
	return true;
	case CURRENT_ITEM_SCALE:
	input = WXUtils.getString(param, null);
	if (input != null) {
	setCurrentItemScale(input);
	}
	return true;
	}
	return super.setProperty(key, param);
	}

	/**
	* we need add translation for left and right card view.
	* */
	private float calculateTranslation(@NonNull View hostPage) {
	if(!(hostPage instanceof ViewGroup)) {
	return 0;
	}
	View realView = ((ViewGroup)hostPage).getChildAt(0);
	float translation = (hostPage.getMeasuredWidth()-realView.getMeasuredWidth()*mNeighborScale)/4;
	translation += ((hostPage.getMeasuredWidth()-realView.getMeasuredWidth() * mCurrentItemScale)/2 - WXViewUtils.getRealPxByWidth(mNeighborSpace, getInstance().getInstanceViewPortWidth()))/2 ;
	return translation;
	}

	// Here is the trick.
	class ZoomTransformer implements ViewPager.PageTransformer {
	@Override
	public void transformPage(View page, float position) {
	int pagePosition = mAdapter.getPagePosition(page);
	int curPosition = mViewPager.getCurrentItem();

	int realCount = mAdapter.getRealCount();

	boolean ignore = false;
	if(curPosition != 0 && curPosition != realCount - 1 && Math.abs(pagePosition - curPosition) > 1) {
	ignore = true;
	}
	if(curPosition == 0 && pagePosition < realCount - 1 && pagePosition > 1) {
	ignore = true;
	}
	if(curPosition == realCount - 1 && pagePosition < realCount - 2 && pagePosition > 0) {
	ignore = true;
	}
	// just transfer the neighbor(left & right) page.
	if(ignore) {
	return;
	}

	View realView = ((ViewGroup)page).getChildAt(0);
	if(realView == null){
	return;
	}
	float alpha, scale;

	if(position <= (-realCount + 1)) {
	position = position + realCount;
	}
	if(position >= realCount - 1) {
	position = position - realCount;
	}

	if (position >= -1 && position <= 1) {
	float factor = Math.abs(Math.abs(position) - 1);
	scale = mNeighborScale + factor * (mCurrentItemScale - mNeighborScale);
	alpha = (1- mNeighborAlpha) * factor + mNeighborAlpha;

	float translation = calculateTranslation(page);
	if(position > 0){
	translation = (position*translation);
	realView.setTranslationX(-translation);
	page.setTranslationX(-translation);
	}else if(position == 0){
	page.setTranslationX(0);
	realView.setTranslationX(0);
	updateAdapterScaleAndAlpha(mNeighborAlpha, mNeighborScale);
	}else{
	if(realCount == 2 && Math.abs(position) == 1) {
	return;
	}
	translation = (-position*translation);
	realView.setTranslationX(translation);
	page.setTranslationX(translation);
	}
	realView.setScaleX(scale);
	realView.setScaleY(scale);
	realView.setAlpha(alpha);
	}

	}
	}

	}