[Expressive design] Add NormalPaddingMixin

/*

 * Copyright (C) 2024 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.settingslib.widget

/**

 * A base interface to indicate that a Preference should have normal paddings.

 *

 * Preferences implementing this interface will be treated as has normal paddings both inside and

 * outside.

 */

interface NormalPaddingMixin

 No newline at end of file

        val v = holder.itemView

        // Update padding

        if (SettingsThemeHelper.isExpressiveTheme(context)) {

            val paddingStart = if (backgroundRes == 0) mNormalPaddingStart else mGroupPaddingStart

            val paddingEnd = if (backgroundRes == 0) mNormalPaddingEnd else mGroupPaddingEnd

            val (paddingStart, paddingEnd) = getStartEndPadding(position, backgroundRes)

            v.setPaddingRelative(paddingStart, v.paddingTop, paddingEnd, v.paddingBottom)

            v.clipToOutline = backgroundRes != 0

        }

        // Update background

        v.setBackgroundResource(backgroundRes)

    }

    private fun getStartEndPadding(position: Int, backgroundRes: Int): Pair<Int, Int> {

        val item = getItem(position)

        return when {

            // This item handles edge to edge itself

            item is NormalPaddingMixin && item is GroupSectionDividerMixin -> 0 to 0

            // According to mappingPreferenceGroup(), backgroundRes == 0 means this item is

            // GroupSectionDividerMixin or PreferenceCategory, which is design to have normal

            // padding.

            // NormalPaddingMixin items are also designed to have normal padding.

            backgroundRes == 0 || item is NormalPaddingMixin ->

                mNormalPaddingStart to mNormalPaddingEnd

            // Other items are suppose to have group padding.

            else -> mGroupPaddingStart to mGroupPaddingEnd

        }

    }

    @DrawableRes

    protected fun getRoundCornerDrawableRes(position: Int, isSelected: Boolean): Int {

        return getRoundCornerDrawableRes(position, isSelected, false)