<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:id="@+id/bottom_toolbar"
    android:layout_width="match_parent"
    android:layout_height="@dimen/bottom_toolbar_height"
    android:visibility="gone"
    app:layout_constraintBottom_toBottomOf="parent"
    tools:visibility="visible"
    >

  <androidx.constraintlayout.widget.ConstraintLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@color/primary"
      >

    <ImageView
        android:id="@+id/bottom_toolbar_bookmark"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:contentDescription="@string/menu_bookmarks"
        android:paddingBottom="12dp"
        android:paddingTop="12dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/bottom_toolbar_arrow_back"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_bookmark_border_24dp"
        />

    <ImageView
        android:id="@+id/bottom_toolbar_arrow_back"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:contentDescription="@string/go_to_previous_page"
        android:paddingBottom="12dp"
        android:paddingTop="12dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/bottom_toolbar_home"
        app:layout_constraintStart_toEndOf="@id/bottom_toolbar_bookmark"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_keyboard_arrow_left_24dp"
        />

    <ImageView
        android:id="@+id/bottom_toolbar_home"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:contentDescription="@string/menu_home"
        android:paddingBottom="12dp"
        android:paddingTop="12dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/bottom_toolbar_arrow_forward"
        app:layout_constraintStart_toEndOf="@id/bottom_toolbar_arrow_back"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/action_home"
        />

    <ImageView
        android:id="@+id/bottom_toolbar_arrow_forward"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:contentDescription="@string/go_to_next_page"
        android:paddingBottom="12dp"
        android:paddingTop="12dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/bottom_toolbar_toc"
        app:layout_constraintStart_toEndOf="@id/bottom_toolbar_home"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_keyboard_arrow_right_24dp"
        />

    <ImageView
        android:id="@+id/bottom_toolbar_toc"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:contentDescription="@string/table_of_contents"
        android:paddingBottom="12dp"
        android:paddingTop="12dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/bottom_toolbar_arrow_forward"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_toc_24dp"
        />
  </androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
