package cn.sinata.xldutils.view;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.database.DataSetObserver;
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import android.graphics.Color;
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import android.os.Build;
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import android.util.AttributeSet;
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import android.view.Gravity;
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import android.view.ViewGroup;
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import android.widget.FrameLayout;
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import android.widget.ImageView;
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import android.widget.LinearLayout;
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import androidx.viewpager.widget.PagerAdapter;
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import androidx.viewpager.widget.ViewPager;
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import cn.sinata.xldutils.R;
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import cn.sinata.xldutils.widget.autoscoll.AutoScrollViewPager;
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/**
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* banner
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* Created by liaoxiang on 16/3/17.
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*/
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public class BannerLayout extends FrameLayout implements ViewPager.OnPageChangeListener {
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private AutoScrollViewPager autoScrollViewPager;
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private LinearLayout indicator;
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private ImageView[] indicatorViews;
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private String indicatorBgColor = "#7F000000";
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private int indicatorHeight = 30;//默认高度，单位dip
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private float aspect = -1f;
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private int interval = 5*1000;//5秒
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private boolean showIndicator = true;
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private PagerAdapter mPagerAdapter;
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private DataSetObserver mDataSetObserver;
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public BannerLayout(Context context) {
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super(context);
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init(context,null);
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}
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public BannerLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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init(context,attrs);
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}
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public BannerLayout(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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init(context,attrs);
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}
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@TargetApi(Build.VERSION_CODES.LOLLIPOP)
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public BannerLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
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super(context, attrs, defStyleAttr, defStyleRes);
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init(context,attrs);
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}
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void init(Context context,AttributeSet attrs){
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//如果pageAdapter调用notifyDataSetChanged();则重新绘制圆点
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mDataSetObserver = new DataSetObserver() {
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@Override
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public void onChanged() {
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super.onChanged();
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showIndicator(showIndicator);
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if (autoScrollViewPager!=null){
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autoScrollViewPager.notifyDataSetChanged();
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}
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}
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};
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if (attrs!=null){
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.BannerLayout);
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aspect= a.getFloat(R.styleable.BannerLayout_aspect, aspect);
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a.recycle();
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}
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autoScrollViewPager = new AutoScrollViewPager(getContext());
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autoScrollViewPager.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
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autoScrollViewPager.setInterval(interval);
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// autoScrollViewPager.setBorderAnimation(false);
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autoScrollViewPager.setBoundaryCaching(false);
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autoScrollViewPager.setStopScrollWhenTouch(true);
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autoScrollViewPager.setSlideBorderMode(AutoScrollViewPager.SLIDE_BORDER_MODE_TO_PARENT);
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autoScrollViewPager.setOffscreenPageLimit(6);
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//noinspection deprecation
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autoScrollViewPager.setOnPageChangeListener(this);
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autoScrollViewPager.setBackgroundColor(Color.GRAY);
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addView(autoScrollViewPager);
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
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// int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
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if (aspect>0) {
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setMeasuredDimension(sizeWidth, (int) (sizeWidth/aspect));
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measureChildren(widthMeasureSpec,heightMeasureSpec);
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}
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else {
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super.onMeasure(widthMeasureSpec,heightMeasureSpec);
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}
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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super.onLayout(changed, left, top, right, bottom);
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// System.err.println("--onLayout--");
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if (aspect>0){
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if (autoScrollViewPager.getLayoutParams()!=null && autoScrollViewPager.getLayoutParams().height<=0){
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int width = getMeasuredWidth();
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//重设高度
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autoScrollViewPager.getLayoutParams().height = (int) (width/aspect);
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}
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}
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}
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/**
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* 设置数据adapter
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* @param pagerAdapter pagerAdapter
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*/
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public void setAdapter(PagerAdapter pagerAdapter){
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if (mPagerAdapter!=null){
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mPagerAdapter.unregisterDataSetObserver(mDataSetObserver);
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}
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mPagerAdapter = pagerAdapter;
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if (pagerAdapter!=null) {
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mPagerAdapter.registerDataSetObserver(mDataSetObserver);
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autoScrollViewPager.setAdapter(mPagerAdapter);
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showIndicator(showIndicator);
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}
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}
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/**
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* 开始自动滚动
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*/
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public void startAutoScroll(){
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autoScrollViewPager.startAutoScroll();
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}
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/**
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* 停止自动滚动
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*/
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public void stopAutoScroll(){
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autoScrollViewPager.stopAutoScroll();
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}
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public void showIndicator(boolean show){
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showIndicator = show;
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if (show){
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if (indicator !=null){
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removeView(indicator);
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indicator = null;
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}
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createIndicatorLayout();
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}else {
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if (indicator!=null){
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removeView(indicator);
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indicator = null;
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}
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}
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}
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public void setCurrentItem(int position){
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autoScrollViewPager.setCurrentItem(position,false);
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}
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// public void setMode(int mode){
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//// autoScrollViewPager.setSlideBorderMode(mode);
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// }
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public void setBoundaryLooping(boolean looping){
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// autoScrollViewPager.setSlideBorderMode(mode);
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autoScrollViewPager.setBoundaryLooping(looping);
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}
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public void setAspect(float aspect){
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this.aspect = aspect;
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invalidate();
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}
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private void createIndicatorLayout(){
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indicator = new LinearLayout(getContext());
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LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,dip2px(indicatorHeight));
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params.gravity = Gravity.BOTTOM;
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indicator.setLayoutParams(params);
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indicator.setGravity(Gravity.CENTER);
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indicator.setOrientation(LinearLayout.HORIZONTAL);
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indicator.setBackgroundColor(Color.parseColor(indicatorBgColor));
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addIndicator();
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//添加小圆点
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addView(indicator);
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}
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private void addIndicator(){
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PagerAdapter pagerAdapter = autoScrollViewPager.getAdapter();
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if (pagerAdapter!=null){
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int count = pagerAdapter.getCount();
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// System.err.println("---->"+count);
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indicatorViews = new ImageView[count];
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for (int i = 0;i<count;i++){
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ImageView view = new ImageView(getContext());
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indicatorViews[i] = view;
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LinearLayout.LayoutParams params =new LinearLayout.LayoutParams(dip2px(5),dip2px(5));
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params.rightMargin = dip2px(5);
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view.setLayoutParams(params);
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view.setScaleType(ImageView.ScaleType.CENTER_CROP);
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view.setBackgroundResource(R.drawable.page_indicator);
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if (i == 0){
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view.setSelected(true);
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}
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indicator.addView(view);
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}
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}
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}
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private int dip2px(int dip){
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final float scale = getContext().getResources().getDisplayMetrics().density;
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return (int)(dip * scale + 0.5f);
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}
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/**
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* 设置选中的tip的背景
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* @param selectItems 选中项
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*/
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private void setImageBackground(int selectItems){
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if (indicatorViews!=null&& indicatorViews.length>0) {
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for (int i = 0; i < indicatorViews.length; i++) {
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if (i == selectItems) {
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indicatorViews[i].setSelected(true);
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} else {
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indicatorViews[i].setSelected(false);
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}
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}
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}
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}
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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}
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@Override
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public void onPageSelected(int position) {
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if (indicator!=null){
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setImageBackground(position);
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}
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}
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@Override
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public void onPageScrollStateChanged(int state) {
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}
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}
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