Create a utility function in WM Shell to set the text font and style of the TextView.

/*

 * Copyright (C) 2025 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.wm.shell.shared

import android.graphics.Typeface

import android.widget.TextView

import com.android.wm.shell.Flags

/**

 * Utility class to apply a specified typeface to a [TextView].

 *

 * This class provides a method, [setTypeface],

 * to easily set a pre-defined font family and style to a given [TextView].

 */

class TypefaceUtils {

    enum class FontFamily(val value: String) {

        GSF_DISPLAY_LARGE("variable-display-large"),

        GSF_DISPLAY_MEDIUM("variable-display-medium"),

        GSF_DISPLAY_SMALL("variable-display-small"),

        GSF_HEADLINE_LARGE("variable-headline-large"),

        GSF_HEADLINE_MEDIUM("variable-headline-medium"),

        GSF_HEADLINE_SMALL("variable-headline-small"),

        GSF_TITLE_LARGE("variable-title-large"),

        GSF_TITLE_MEDIUM("variable-title-medium"),

        GSF_TITLE_SMALL("variable-title-small"),

        GSF_LABEL_LARGE("variable-label-large"),

        GSF_LABEL_MEDIUM("variable-label-medium"),

        GSF_LABEL_SMALL("variable-label-small"),

        GSF_BODY_LARGE("variable-body-large"),

        GSF_BODY_MEDIUM("variable-body-medium"),

        GSF_BODY_SMALL("variable-body-small"),

        GSF_DISPLAY_LARGE_EMPHASIZED("variable-display-large-emphasized"),

        GSF_DISPLAY_MEDIUM_EMPHASIZED("variable-display-medium-emphasized"),

        GSF_DISPLAY_SMALL_EMPHASIZED("variable-display-small-emphasized"),

        GSF_HEADLINE_LARGE_EMPHASIZED("variable-headline-large-emphasized"),

        GSF_HEADLINE_MEDIUM_EMPHASIZED("variable-headline-medium-emphasized"),

        GSF_HEADLINE_SMALL_EMPHASIZED("variable-headline-small-emphasized"),

        GSF_TITLE_LARGE_EMPHASIZED("variable-title-large-emphasized"),

        GSF_TITLE_MEDIUM_EMPHASIZED("variable-title-medium-emphasized"),

        GSF_TITLE_SMALL_EMPHASIZED("variable-title-small-emphasized"),

        GSF_LABEL_LARGE_EMPHASIZED("variable-label-large-emphasized"),

        GSF_LABEL_MEDIUM_EMPHASIZED("variable-label-medium-emphasized"),

        GSF_LABEL_SMALL_EMPHASIZED("variable-label-small-emphasized"),

        GSF_BODY_LARGE_EMPHASIZED("variable-body-large-emphasized"),

        GSF_BODY_MEDIUM_EMPHASIZED("variable-body-medium-emphasized"),

        GSF_BODY_SMALL_EMPHASIZED("variable-body-small-emphasized"),

    }

    companion object {

        /**

         * Sets the typeface of the provided [textView] to the specified [fontFamily] and [fontStyle].

         *

         * The typeface is only applied to the [TextView] when [Flags.enableGsf] is `true`.

         * If [Flags.enableGsf] is `false`, this method has no effect.

         *

         * @param textView The [TextView] to which the typeface should be applied. If `null`, this method does nothing.

         * @param fontFamily The desired [FontFamily] for the [TextView].

         * @param fontStyle The desired font style (e.g., [Typeface.NORMAL], [Typeface.BOLD], [Typeface.ITALIC]). Defaults to [Typeface.NORMAL].

         */

        @JvmStatic

        @JvmOverloads

        fun setTypeface(

            textView: TextView?,

            fontFamily: FontFamily,

            fontStyle: Int = Typeface.NORMAL,

        ) {

            if (!Flags.enableGsf()) return

            textView?.typeface = Typeface.create(fontFamily.name, fontStyle)

        }

    }

}