Java 类android.support.v4.view.NestedScrollingParent 实例源码

protected View findScrollableViewInternal(View content, boolean selfable) {
    View scrollableView = null;
    Queue<View> views = new LinkedBlockingQueue<>(Collections.singletonList(content));
    while (!views.isEmpty() && scrollableView == null) {
        View view = views.poll();
        if (view != null) {
            if ((selfable || view != content) && (view instanceof AbsListView
                    || view instanceof ScrollView
                    || view instanceof ScrollingView
                    || view instanceof NestedScrollingChild
                    || view instanceof NestedScrollingParent
                    || view instanceof WebView
                    || view instanceof ViewPager)) {
                scrollableView = view;
            } else if (view instanceof ViewGroup) {
                ViewGroup group = (ViewGroup) view;
                for (int j = 0; j < group.getChildCount(); j++) {
                    views.add(group.getChildAt(j));
                }
            }
        }
    }
    return scrollableView;
}

@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
    super.setPrimaryItem(container, position, object);
    if (object instanceof View) {
        mScrollableView = ((View) object);
    } else if (object instanceof Fragment) {
        mScrollableView = ((Fragment) object).getView();
    }
    if (mScrollableView != null) {
        mScrollableView = findScrollableViewInternal(mScrollableView, true);
        if (mScrollableView instanceof NestedScrollingParent
                && !(mScrollableView instanceof NestedScrollingChild)) {
            mScrollableView = findScrollableViewInternal(mScrollableView, false);
        }
    }
}

protected void findScrollableView(View content, RefreshKernel kernel) {
    mScrollableView = null;
    while (mScrollableView == null || (mScrollableView instanceof NestedScrollingParent
            && !(mScrollableView instanceof NestedScrollingChild))) {
        content = findScrollableViewInternal(content, mScrollableView == null);
        if (content == mScrollableView) {
            break;
        }
        try {//try 不能删除，不然会出现兼容性问题
            if (content instanceof CoordinatorLayout) {
                kernel.getRefreshLayout().setEnableNestedScroll(false);
                wrapperCoordinatorLayout(((CoordinatorLayout) content), kernel.getRefreshLayout());
            }
        } catch (Throwable ignored) {
        }
        mScrollableView = content;
    }
}

private View findScrollableViewInternal(View content, boolean selfable) {
    View scrollableView = null;
    Queue<View> views = new LinkedBlockingQueue<>(Collections.singletonList(content));
    while (!views.isEmpty() && scrollableView == null) {
        View view = views.poll();
        if (view != null) {
            if ((selfable || view != content) && (view instanceof AbsListView
                    || view instanceof ScrollView
                    || view instanceof ScrollingView
                    || view instanceof NestedScrollingChild
                    || view instanceof NestedScrollingParent
                    || view instanceof WebView
                    || view instanceof ViewPager)) {
                scrollableView = view;
            } else if (view instanceof ViewGroup) {
                ViewGroup group = (ViewGroup) view;
                for (int j = 0; j < group.getChildCount(); j++) {
                    views.add(group.getChildAt(j));
                }
            }
        }
    }
    return scrollableView;
}

@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
    super.setPrimaryItem(container, position, object);
    if (object instanceof View) {
        mScrollableView = ((View) object);
    } else if (object instanceof Fragment) {
        mScrollableView = ((Fragment) object).getView();
    }
    if (mScrollableView != null) {
        mScrollableView = findScrollableViewInternal(mScrollableView, true);
        if (mScrollableView instanceof NestedScrollingParent
                && !(mScrollableView instanceof NestedScrollingChild)) {
            mScrollableView = findScrollableViewInternal(mScrollableView, false);
        }
    }
}

protected void findScrollableView(View content, RefreshKernel kernel) {
    mScrollableView = null;
    while (mScrollableView == null || (mScrollableView instanceof NestedScrollingParent
            && !(mScrollableView instanceof NestedScrollingChild))) {
        content = findScrollableViewInternal(content, mScrollableView == null);
        if (content == mScrollableView) {
            break;
        }
        try {//try 不能删除，不然会出现兼容性问题
            if (content instanceof CoordinatorLayout) {
                kernel.getRefreshLayout().setEnableNestedScroll(false);
                wrapperCoordinatorLayout(((ViewGroup) content), kernel.getRefreshLayout());
            }
        } catch (Throwable ignored) {
        }
        mScrollableView = content;
    }
}

protected boolean isScrollableView(View view) {
    return view instanceof AbsListView
            || view instanceof ScrollView
            || view instanceof ScrollingView
            || view instanceof NestedScrollingChild
            || view instanceof NestedScrollingParent
            || view instanceof WebView
            || view instanceof ViewPager;
}

private void findScrollableView(View content) {
    mScrollableView = findScrollableViewInternal(content, true);
    if (mScrollableView instanceof NestedScrollingParent
            && !(mScrollableView instanceof NestedScrollingChild)) {
        mScrollableView = findScrollableViewInternal(mScrollableView, false);
    }
    if (mScrollableView instanceof ViewPager) {
        wrapperViewPager((ViewPager) this.mScrollableView);
    }
    if (mScrollableView == null) {
        mScrollableView = content;
    }
}

protected boolean isScrollableView(View view) {
    return view instanceof AbsListView
            || view instanceof ScrollView
            || view instanceof ScrollingView
            || view instanceof NestedScrollingChild
            || view instanceof NestedScrollingParent
            || view instanceof WebView
            || view instanceof ViewPager;
}