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package com.taobao.weex.ui.component;
import android.content.Context;
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.dom.WXDomObject;
import com.taobao.weex.ui.ComponentCreator;
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 neighor page
public static final String NEIGHBOR_ALPHA = "neighborAlpha"; // the init alpha of neighor page
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 float mNerghborScale = DEFAULT_NEIGHBOR_SCALE;
private float mNerghborAlpha = DEFAULT_NEIGHBOR_ALPHA;
private static final float WX_DEFAULT_MAIN_NEIGHBOR_SCALE = 0.9f;
public WXSliderNeighbor(WXSDKInstance instance, WXDomObject dom, WXVContainer parent, String instanceId, boolean isLazy) {
super(instance, dom, parent, instanceId, isLazy);
}
public WXSliderNeighbor(WXSDKInstance instance, WXDomObject node, WXVContainer parent, boolean lazy) {
super(instance, node, parent, lazy);
}
public static class Creator implements ComponentCreator {
public WXComponent createInstance(WXSDKInstance instance, WXDomObject node, WXVContainer parent, boolean lazy) throws IllegalAccessException, InvocationTargetException, InstantiationException {
return new WXSliderNeighbor(instance, node, parent, lazy);
}
}
@Override
public void bindData(WXComponent component) {
super.bindData(component);
mViewPager.setCurrentItem(0);
if(mAdapter.getRealCount() > 3){
mViewPager.setOffscreenPageLimit(2);
}else if(mAdapter.getRealCount() == 3){
mViewPager.setOffscreenPageLimit(1);
}
}
@Override
protected FrameLayout initComponentHostView(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(mContext);
mViewPager.setLayoutParams(pagerParams);
// init adapter
mAdapter = new WXCirclePageAdapter();
mViewPager.setAdapter(mAdapter);
// add to parent
view.addView(mViewPager);
mViewPager.addOnPageChangeListener(mPageChangeListener);
// set animation
mViewPager.setPageTransformer(true, new ZoomTransformer());
mViewPager.setOverScrollMode(View.OVER_SCROLL_NEVER);
view.setClipChildren(false);
registerActivityStateListener();
return view;
}
@Override
protected void addSubView(View view, int index) {
updateScaleAndAlpha(view, mNerghborAlpha, mNerghborScale); // we need to set neighbor view status when added.
if (view == null || mAdapter == null) {
return;
}
if (view instanceof WXCircleIndicator) {
return;
}
FrameLayout wrapper = new FrameLayout(mContext);
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.gravity = Gravity.CENTER;
view.setLayoutParams(params);
wrapper.addView(view);
mAdapter.addPageView(wrapper);
mAdapter.notifyDataSetChanged();
if (mIndicator != null) {
mIndicator.getHostView().forceLayout();
mIndicator.getHostView().requestLayout();
}
}
private void updateScaleAndAlpha(View view, float alpha, float scale) {
if(null == view) {
return;
}
if(alpha >= 0) {
view.setAlpha(alpha);
}
if(scale >= 0) {
view.setScaleX(scale);
view.setScaleY(scale);
}
}
private void updateAdpaterScaleAndAplha(float alpha, float scale) {
List<View> pageViews = mAdapter.getViews();
int cusPos = mViewPager.getCurrentItem();
if(null != pageViews && pageViews.size() > 0) {
for(View v : pageViews) {
View realView = ((ViewGroup)v).getChildAt(0);
if(mAdapter.getItemPosition(v) != cusPos) {
updateScaleAndAlpha(realView, alpha, scale);
}else{
updateScaleAndAlpha(realView,1.0F,WX_DEFAULT_MAIN_NEIGHBOR_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.mNerghborScale != neighborScale) {
this.mNerghborScale = neighborScale;
updateAdpaterScaleAndAplha(-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.mNerghborAlpha != neighborAlpha) {
this.mNerghborAlpha = neighborAlpha;
updateAdpaterScaleAndAplha(neighborAlpha, -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;
}
return super.setProperty(key, param);
}
// Here is the trick.
class ZoomTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View page, float position) {
View realView = ((ViewGroup)page).getChildAt(0);
if(realView == null){
return;
}
float alpha, scale;
if(position <= (-mAdapter.getRealCount() + 1)) {
position = position + mAdapter.getRealCount();
}
if(position >= mAdapter.getRealCount() - 1) {
position = position - mAdapter.getRealCount();
}
if (position >= -1 && position <= 1) {
float factor = Math.abs(Math.abs(position) - 1);
scale = mNerghborScale + factor * (WX_DEFAULT_MAIN_NEIGHBOR_SCALE-mNerghborScale);
alpha = (1-mNerghborAlpha) * factor + mNerghborAlpha;
int delta = page.getMeasuredWidth()-realView.getMeasuredWidth();
float translation = ((page.getMeasuredWidth()-realView.getMeasuredWidth()*WX_DEFAULT_MAIN_NEIGHBOR_SCALE)- WXViewUtils.getRealPxByWidth(DEFAULT_NEIGHBOR_SPACE)*2)/2;
if(mViewPager.getCurrentItem() != mAdapter.getItemPosition(page)){
if(position > 0){
realView.setPivotX(0);
realView.setTranslationX(-delta);
page.setTranslationX(-translation);
}else{
realView.setPivotX(realView.getMeasuredWidth());
realView.setTranslationX(delta);
page.setTranslationX(translation);
}
}else{
realView.setPivotX(realView.getMeasuredWidth()/2);
page.setTranslationX(0);
realView.setTranslationX(0);
}
realView.setPivotY(realView.getMeasuredHeight()/2);
realView.setAlpha(alpha);
realView.setScaleX(scale);
realView.setScaleY(scale);
}
}
}
}