游戏详情专区支持显示webview页面
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张玉久
183
app/src/main/java/com/gh/common/view/NestedScrollWebView.java
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183
app/src/main/java/com/gh/common/view/NestedScrollWebView.java
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package com.gh.common.view;
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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 androidx.core.view.MotionEventCompat;
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import androidx.core.view.NestedScrollingChild;
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import androidx.core.view.NestedScrollingChildHelper;
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import androidx.core.view.ViewCompat;
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import wendu.dsbridge.DWebView;
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/**
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* 由于WebView没有实现NestedScrollingChild导致与CoordinatorLayout不能实现联动效果
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* 所以需要自己实现NestedScrollingChild
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*/
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public class NestedScrollWebView extends DWebView implements NestedScrollingChild {
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public static final String TAG = NestedScrollWebView.class.getSimpleName();
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private int mLastMotionY;
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private final int[] mScrollOffset = new int[2];
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private final int[] mScrollConsumed = new int[2];
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private int mNestedYOffset;
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private NestedScrollingChildHelper mChildHelper;
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public NestedScrollWebView(Context context) {
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super(context);
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init();
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}
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public NestedScrollWebView(Context context, AttributeSet attrs) {
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super(context, attrs);
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init();
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}
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private void init() {
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mChildHelper = new NestedScrollingChildHelper(this);
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setNestedScrollingEnabled(true);
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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boolean result = false;
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MotionEvent trackedEvent = MotionEvent.obtain(event);
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final int action = MotionEventCompat.getActionMasked(event);
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if (action == MotionEvent.ACTION_DOWN) {
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mNestedYOffset = 0;
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}
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int y = (int) event.getY();
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event.offsetLocation(0, mNestedYOffset);
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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mLastMotionY = y;
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int nestedScrollAxis = ViewCompat.SCROLL_AXIS_VERTICAL;
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nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL; //按位或运算
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// startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
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startNestedScroll(nestedScrollAxis);
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result = super.onTouchEvent(event);
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break;
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case MotionEvent.ACTION_MOVE:
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int deltaY = mLastMotionY - y;
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if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) {
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deltaY -= mScrollConsumed[1];
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trackedEvent.offsetLocation(0, mScrollOffset[1]);
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mNestedYOffset += mScrollOffset[1];
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}
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int oldY = getScrollY();
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mLastMotionY = y - mScrollOffset[1];
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int newScrollY = Math.max(0, oldY + deltaY);
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deltaY -= newScrollY - oldY;
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if (dispatchNestedScroll(0, newScrollY - deltaY, 0, deltaY, mScrollOffset)) {
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mLastMotionY -= mScrollOffset[1];
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trackedEvent.offsetLocation(0, mScrollOffset[1]);
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mNestedYOffset += mScrollOffset[1];
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}
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if (mScrollConsumed[1] == 0 && mScrollOffset[1] == 0) {
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trackedEvent.recycle();
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result = super.onTouchEvent(trackedEvent);
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}
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break;
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case MotionEvent.ACTION_POINTER_DOWN:
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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stopNestedScroll();
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result = super.onTouchEvent(event);
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break;
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}
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return result;
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}
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// NestedScrollingChild
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@Override
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public void setNestedScrollingEnabled(boolean enabled) {//设置嵌套滑动是否可用
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mChildHelper.setNestedScrollingEnabled(enabled);
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}
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@Override
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public boolean isNestedScrollingEnabled() {//嵌套滑动是否可用
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return mChildHelper.isNestedScrollingEnabled();
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}
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/**
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* 开始嵌套滑动,
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*
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* @param axes 表示方向 有一下两种值
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* ViewCompat.SCROLL_AXIS_HORIZONTAL 横向滑动
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* ViewCompat.SCROLL_AXIS_VERTICAL 纵向滑动
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*/
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@Override
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public boolean startNestedScroll(int axes) {
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return mChildHelper.startNestedScroll(axes);
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}
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@Override
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public void stopNestedScroll() {//停止嵌套滑动
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mChildHelper.stopNestedScroll();
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}
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@Override
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public boolean hasNestedScrollingParent() {//是否有父View 支持 嵌套滑动, 会一层层的网上寻找父View
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return mChildHelper.hasNestedScrollingParent();
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}
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/**
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* 在处理滑动之后 调用
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*
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* @param dxConsumed x轴上 被消费的距离
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* @param dyConsumed y轴上 被消费的距离
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* @param dxUnconsumed x轴上 未被消费的距离
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* @param dyUnconsumed y轴上 未被消费的距离
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* @param offsetInWindow view 的移动距离
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* @return
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*/
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@Override
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public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow) {
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return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow);
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}
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/**
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* 一般在滑动之前调用, 在ontouch 中计算出滑动距离, 然后调用该方法, 就给支持的嵌套的父View 处理滑动事件
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*
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* @param dx x 轴上滑动的距离, 相对于上一次事件, 不是相对于 down事件的 那个距离
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* @param dy y 轴上滑动的距离
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* @param consumed 一个数组, 可以传 一个空的 数组, 表示 x 方向 或 y 方向的事件 是否有被消费
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* @param offsetInWindow 支持嵌套滑动到额父View 消费 滑动事件后 导致 本 View 的移动距离
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* @return 支持的嵌套的父View 是否处理了 滑动事件
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*/
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@Override
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public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) {
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return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow);
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}
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/**
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* @param velocityX x 轴上的滑动速度
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* @param velocityY y 轴上的滑动速度
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* @param consumed 是否被消费
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* @return
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*/
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@Override
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public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
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return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed);
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}
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/**
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* @param velocityX x 轴上的滑动速度
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* @param velocityY y 轴上的滑动速度
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* @return
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*/
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@Override
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public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
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return mChildHelper.dispatchNestedPreFling(velocityX, velocityY);
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}
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}
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