<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background"
    android:orientation="vertical">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/tool_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/background_menu"
        android:elevation="5dp"
        android:theme="?attr/actionBarStyle"
        app:displayHomeAsUp="false"
        app:fitStatusBar="false"
        app:layout_constraintTop_toTopOf="parent"
        app:popupTheme="@style/AppTheme.PopupOverlay"
        app:titleTextAppearance="@style/ToolbarTitle" />

    <io.legado.app.ui.widget.anima.RefreshProgressBar
        android:id="@+id/refresh_progress_bar"
        android:layout_width="match_parent"
        android:layout_height="2dp"
        app:layout_constraintTop_toBottomOf="@+id/tool_bar" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/refresh_progress_bar" />

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/cl_toc"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="@color/background"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tool_bar">

        <FrameLayout
            android:id="@+id/fl_hide_toc"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/background"
            android:elevation="4dp"
            app:layout_constraintTop_toTopOf="parent">

            <androidx.constraintlayout.utils.widget.ImageFilterView
                android:id="@+id/iv_hide_toc"
                android:layout_width="match_parent"
                android:layout_height="36dp"
                android:src="@drawable/ic_arrow_down"
                android:background="?android:attr/selectableItemBackground"
                app:tint="@color/primaryText" />

        </FrameLayout>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler_view_toc"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/fl_hide_toc" />

        <io.legado.app.ui.widget.anima.RotateLoading
            android:id="@+id/loading_toc"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:visibility="gone"
            app:layout_constraintTop_toTopOf="@+id/recycler_view_toc"
            app:layout_constraintLeft_toLeftOf="@+id/recycler_view_toc"
            app:layout_constraintRight_toRightOf="@+id/recycler_view_toc"
            app:layout_constraintBottom_toBottomOf="@+id/recycler_view_toc" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>