package com.mm.android.deviceaddmodule.mobilecommon.widget;
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import android.animation.ObjectAnimator;
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import android.animation.ValueAnimator;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewConfiguration;
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import android.view.ViewGroup;
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import android.widget.ScrollView;
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public class ZoomInScrollView extends ScrollView {
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private View mHeaderView;
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private int mHeaderWidth;
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private int mHeaderHeight;
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/**
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* 是否正在下拉
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*/
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private boolean mIsPulling;
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private int mLastY;
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//滑动放大系数，系数越大，滑动时放大程度越大
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private float mScaleRatio = 0.4f;
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// 最大的放大倍数
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private float mScaleTimes = 2.0f;
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// 回弹时间系数，系数越小，回弹越快
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private float mReplyRatio = 0.5f;
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public ZoomInScrollView(Context context) {
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this(context, null);
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}
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public ZoomInScrollView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public ZoomInScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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mSlop = ViewConfiguration.get(context).getScaledEdgeSlop();
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}
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public void setHeaderView(View headerView) {
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mHeaderView = headerView;
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mHeaderWidth = mHeaderView.getMeasuredWidth();
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mHeaderHeight = mHeaderView.getMeasuredHeight();
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}
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@Override
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protected void onFinishInflate() {
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super.onFinishInflate();
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//设置不可过度滚动，否则上移后下拉会出现部分空白的情况
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setOverScrollMode(OVER_SCROLL_NEVER);
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View child = getChildAt(0);
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if (child != null && child instanceof ViewGroup) {
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//获取默认第一个子View
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mHeaderView = ((ViewGroup) child).getChildAt(0);
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}
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}
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@Override
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protected void onSizeChanged(int w, int h, int oldw, int oldh) {
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super.onSizeChanged(w, h, oldw, oldh);
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mHeaderWidth = mHeaderView.getMeasuredWidth();
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mHeaderHeight = mHeaderView.getMeasuredHeight();
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}
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private float mDownX;
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private float mDownY;
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private int mSlop;
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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switch (ev.getAction()){
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case MotionEvent.ACTION_DOWN:
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mDownX = ev.getX();
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mDownY = ev.getY();
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break;
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case MotionEvent.ACTION_MOVE:
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if(Math.abs(Math.abs(ev.getX() - mDownX)) > mSlop || Math.abs(Math.abs(ev.getY() - mDownY)) > mSlop ){
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return true;
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}
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}
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return super.onInterceptTouchEvent(ev);
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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if (mHeaderView == null)
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return super.onTouchEvent(ev);
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switch (ev.getAction()) {
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case MotionEvent.ACTION_MOVE:
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if (!mIsPulling) {
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//第一次下拉
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if (getScrollY() == 0) {
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//在顶部的时候，记录顶部位置
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mLastY = (int) ev.getY();
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} else {
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break;
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}
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}
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if (ev.getY() - mLastY < 0)
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return super.onTouchEvent(ev);
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int distance = (int) ((ev.getY() - mLastY) * mScaleRatio);
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mIsPulling = true;
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setZoom(distance);
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return true;
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case MotionEvent.ACTION_UP:
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mIsPulling = false;
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replyView();
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break;
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}
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return super.onTouchEvent(ev);
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}
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/**
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* 放大view
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*/
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private void setZoom(float s) {
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float scaleTimes = (float) ((mHeaderWidth + s) / (mHeaderWidth * 1.0));
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// 如超过最大放大倍数，直接返回
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if (scaleTimes > mScaleTimes) return;
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ViewGroup.LayoutParams layoutParams = mHeaderView.getLayoutParams();
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layoutParams.width = (int) (mHeaderWidth + s);
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layoutParams.height = (int) (mHeaderHeight * ((mHeaderWidth + s) / mHeaderWidth));
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// 设置控件水平居中
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((MarginLayoutParams) layoutParams).setMargins(-(layoutParams.width - mHeaderWidth) / 2, 0, 0, 0);
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mHeaderView.setLayoutParams(layoutParams);
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}
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/**
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* 回弹
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*/
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private void replyView() {
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final float distance = mHeaderView.getMeasuredWidth() - mHeaderWidth;
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// 设置动画
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ValueAnimator anim = ObjectAnimator.ofFloat(distance, 0.0F).setDuration((long) (distance * mReplyRatio));
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anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
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@Override
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public void onAnimationUpdate(ValueAnimator animation) {
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setZoom((Float) animation.getAnimatedValue());
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}
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});
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anim.start();
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}
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@Override
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protected void onScrollChanged(int l, int t, int oldl, int oldt) {
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super.onScrollChanged(l, t, oldl, oldt);
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if (onScrollListener != null) onScrollListener.onScroll(l, t, oldl, oldt);
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}
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private OnScrollListener onScrollListener;
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public void setOnScrollListener(OnScrollListener onScrollListener) {
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this.onScrollListener = onScrollListener;
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}
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/**
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* 滑动监听
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*/
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public interface OnScrollListener {
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void onScroll(int scrollX, int scrollY, int oldScrollX, int oldScrollY);
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}
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}
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