takahirom / webview-in-coordinatorlayout Goto Github PK

init {
    isNestedScrollingEnabled = true
}

@SuppressLint("ClickableViewAccessibility")
override fun onTouchEvent(ev: MotionEvent): Boolean {
    val event = obtain(ev)
    var returnValue = false

    event.offsetLocation(0f, mNestedOffsetY)

    when (ev.action) {
        ACTION_DOWN -> {
            returnValue = super.onTouchEvent(event)
            mLastY = event.y
            // start NestedScroll
            startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL)
        }
        ACTION_MOVE -> {
            var deltaY = mLastY - event.y
            // NestedPreScroll
            if (dispatchNestedPreScroll(0, deltaY.toInt(), mScrollConsumed, mScrollOffset)) {
                deltaY -= mScrollConsumed[1]
                mLastY = event.y - mScrollOffset[1]
                event.offsetLocation(0f, (-mScrollOffset[1]).toFloat())
                mNestedOffsetY += mScrollOffset[1]
            }

            returnValue = super.onTouchEvent(event)

            // NestedScroll
            if (dispatchNestedScroll(0, mScrollOffset[1], 0, deltaY.toInt(), mScrollOffset)) {
                event.offsetLocation(0f, mScrollOffset[1].toFloat())
                mNestedOffsetY += mScrollOffset[1]
                mLastY -= mScrollOffset[1]
            }
        }
        ACTION_UP, ACTION_CANCEL -> {
            mNestedOffsetY = 0F
            returnValue = super.onTouchEvent(event)
            // end NestedScroll
            stopNestedScroll()
        }
    }
    return returnValue
}

// Nested Scroll implements
override fun setNestedScrollingEnabled(enabled: Boolean) {
    mChildHelper.isNestedScrollingEnabled = enabled
}

override fun stopNestedScroll() {
    mChildHelper.stopNestedScroll()
}

override fun isNestedScrollingEnabled() = mChildHelper.isNestedScrollingEnabled
override fun startNestedScroll(axes: Int) = mChildHelper.startNestedScroll(axes)
override fun hasNestedScrollingParent() = mChildHelper.hasNestedScrollingParent()
override fun dispatchNestedPreScroll(dx: Int, dy: Int, consumed: IntArray?, offsetInWindow: IntArray?) = mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow)
override fun dispatchNestedFling(velocityX: Float, velocityY: Float, consumed: Boolean) = mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed)
override fun dispatchNestedPreFling(velocityX: Float, velocityY: Float) = mChildHelper.dispatchNestedPreFling(velocityX, velocityY)
override fun dispatchNestedScroll(dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int,
                                  offsetInWindow: IntArray?) = mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow)

    public NestedWebView(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
    }

    public NestedWebView(Context context, AttributeSet attrs) {
            this(context, attrs, android.R.attr.webViewStyle);
    }

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".ArticleReaderActivity"
    >

<com.google.android.material.appbar.AppBarLayout
        android:id="@+id/app_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.MaterialComponents.ActionBar.Primary">

    <com.google.android.material.appbar.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbarLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginEnd="64dp"
            app:expandedTitleMarginStart="48dp"
            app:expandedTitleTextAppearance="@style/ExpandedAppBar"
            app:collapsedTitleTextAppearance="@style/CollapsedAppBar"
            app:expandedTitleGravity="bottom|center_horizontal"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <ImageView
                android:id="@+id/imageview_section_reader"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="fitXY"
                app:layout_collapseMode="parallax"
                android:contentDescription="@string/desc"
                />

        <include layout="@layout/toolbar"/>

    </com.google.android.material.appbar.CollapsingToolbarLayout>

</com.google.android.material.appbar.AppBarLayout>


<com.test.NestedWebView
        android:id="@+id/webviev_section_reader"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>`

 </androidx.coordinatorlayout.widget.CoordinatorLayout>