res/layout/input_pad.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
    SPDX-FileCopyrightText: 2023 The LineageOS Project
    SPDX-License-Identifier: Apache-2.0
-->
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/input_pad"
    style="@style/PadLayoutStyle"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?colorSurface">

    <com.android.calculator2.HapticButton
        android:id="@+id/clr"
        style="@style/PadButtonStyle.Caps"
        android:contentDescription="@string/desc_clr"
        android:text="@string/clr"
        android:theme="@style/Theme.Button.Clear"
        app:layout_constraintBottom_toTopOf="@id/rowGuide1"
        app:layout_constraintEnd_toStartOf="@id/columnGuide1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <com.android.calculator2.HapticButton
        android:id="@+id/paren"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_paren"
        android:text="@string/paren"
        android:theme="@style/Theme.Button.Operator"
        app:layout_constraintBottom_toTopOf="@id/rowGuide1"
        app:layout_constraintEnd_toStartOf="@id/columnGuide2"
        app:layout_constraintStart_toStartOf="@id/columnGuide1"
        app:layout_constraintTop_toTopOf="parent" />

    <com.android.calculator2.HapticButton
        android:id="@+id/lparen"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_lparen"
        android:text="@string/lparen"
        android:theme="@style/Theme.Button.Operator"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@id/rowGuide1"
        app:layout_constraintEnd_toStartOf="@id/columnGuide2"
        app:layout_constraintStart_toStartOf="@id/columnGuide1"
        app:layout_constraintTop_toTopOf="parent" />

    <com.android.calculator2.HapticButton
        android:id="@+id/rparen"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_rparen"
        android:text="@string/rparen"
        android:theme="@style/Theme.Button.Operator"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@id/rowGuide1"
        app:layout_constraintEnd_toStartOf="@id/columnGuide2"
        app:layout_constraintStart_toStartOf="@id/columnGuide1"
        app:layout_constraintTop_toTopOf="parent" />

    <com.android.calculator2.HapticButton
        android:id="@+id/op_pct"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_op_pct"
        android:text="@string/op_pct"
        android:theme="@style/Theme.Button.Operator"
        app:layout_constraintBottom_toTopOf="@id/rowGuide1"
        app:layout_constraintEnd_toStartOf="@id/columnGuide3"
        app:layout_constraintStart_toEndOf="@id/columnGuide2"
        app:layout_constraintTop_toTopOf="parent" />

    <com.android.calculator2.HapticButton
        android:id="@+id/op_div"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_op_div"
        android:text="@string/op_div"
        android:theme="@style/Theme.Button.Operator"
        app:layout_constraintBottom_toTopOf="@id/rowGuide1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/columnGuide3"
        app:layout_constraintTop_toTopOf="parent" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_7"
        style="@style/PadButtonStyle"
        android:text="@string/digit_7"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide2"
        app:layout_constraintEnd_toStartOf="@id/columnGuide1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/rowGuide1" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_8"
        style="@style/PadButtonStyle"
        android:text="@string/digit_8"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide2"
        app:layout_constraintEnd_toStartOf="@id/columnGuide2"
        app:layout_constraintStart_toEndOf="@id/columnGuide1"
        app:layout_constraintTop_toBottomOf="@id/rowGuide1" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_9"
        style="@style/PadButtonStyle"
        android:text="@string/digit_9"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide2"
        app:layout_constraintEnd_toStartOf="@id/columnGuide3"
        app:layout_constraintStart_toEndOf="@id/columnGuide2"
        app:layout_constraintTop_toBottomOf="@id/rowGuide1" />

    <com.android.calculator2.HapticButton
        android:id="@+id/op_mul"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_op_mul"
        android:text="@string/op_mul"
        android:theme="@style/Theme.Button.Operator"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/columnGuide3"
        app:layout_constraintTop_toBottomOf="@id/rowGuide1" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_4"
        style="@style/PadButtonStyle"
        android:text="@string/digit_4"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide3"
        app:layout_constraintEnd_toStartOf="@id/columnGuide1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@id/rowGuide2" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_5"
        style="@style/PadButtonStyle"
        android:text="@string/digit_5"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide3"
        app:layout_constraintEnd_toStartOf="@id/columnGuide2"
        app:layout_constraintStart_toEndOf="@id/columnGuide1"
        app:layout_constraintTop_toTopOf="@id/rowGuide2" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_6"
        style="@style/PadButtonStyle"
        android:text="@string/digit_6"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide3"
        app:layout_constraintEnd_toStartOf="@id/columnGuide3"
        app:layout_constraintStart_toEndOf="@id/columnGuide2"
        app:layout_constraintTop_toTopOf="@id/rowGuide2" />

    <com.android.calculator2.HapticButton
        android:id="@+id/op_sub"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_op_sub"
        android:text="@string/op_sub"
        android:theme="@style/Theme.Button.Operator"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/columnGuide3"
        app:layout_constraintTop_toTopOf="@id/rowGuide2" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_1"
        style="@style/PadButtonStyle"
        android:text="@string/digit_1"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide4"
        app:layout_constraintEnd_toStartOf="@id/columnGuide1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/rowGuide3" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_2"
        style="@style/PadButtonStyle"
        android:text="@string/digit_2"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="@id/rowGuide4"
        app:layout_constraintEnd_toStartOf="@id/columnGuide2"
        app:layout_constraintStart_toEndOf="@id/columnGuide1"
        app:layout_constraintTop_toBottomOf="@id/rowGuide3" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_3"
        style="@style/PadButtonStyle"
        android:text="@string/digit_3"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toTopOf="@id/rowGuide4"
        app:layout_constraintEnd_toStartOf="@id/columnGuide3"
        app:layout_constraintStart_toEndOf="@id/columnGuide2"
        app:layout_constraintTop_toBottomOf="@id/rowGuide3" />

    <com.android.calculator2.HapticButton
        android:id="@+id/op_add"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_op_add"
        android:text="@string/op_add"
        android:theme="@style/Theme.Button.Operator"
        app:layout_constraintBottom_toTopOf="@id/rowGuide4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/columnGuide3"
        app:layout_constraintTop_toBottomOf="@id/rowGuide3" />

    <com.android.calculator2.HapticButton
        android:id="@+id/dec_point"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_dec_point"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/columnGuide1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/rowGuide4" />

    <com.android.calculator2.HapticButton
        android:id="@+id/digit_0"
        style="@style/PadButtonStyle"
        android:text="@string/digit_0"
        android:theme="@style/Theme.Button.Numeric"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/columnGuide2"
        app:layout_constraintStart_toEndOf="@id/columnGuide1"
        app:layout_constraintTop_toBottomOf="@id/rowGuide4" />

    <com.android.calculator2.HapticButton
        android:id="@+id/del"
        style="@style/PadButtonStyle.Image"
        android:contentDescription="@string/desc_del"
        android:theme="@style/Theme.Button.Numeric"
        app:icon="@drawable/ic_del"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/columnGuide3"
        app:layout_constraintStart_toEndOf="@id/columnGuide2"
        app:layout_constraintTop_toBottomOf="@id/rowGuide4" />

    <com.android.calculator2.HapticButton
        android:id="@+id/eq"
        style="@style/PadButtonStyle"
        android:contentDescription="@string/desc_eq"
        android:text="@string/eq"
        android:theme="@style/Theme.Button.Action"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/columnGuide3"
        app:layout_constraintTop_toBottomOf="@id/rowGuide4" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/columnGuide1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.25" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/columnGuide2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.5" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/columnGuide3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.75" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/rowGuide1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.20" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/rowGuide2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.4" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/rowGuide3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.6" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/rowGuide4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.8" />

</androidx.constraintlayout.widget.ConstraintLayout>