thenIf modifier. am: 4b5abe26

/*

 * Copyright (C) 2023 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.systemui.compose.modifiers

import androidx.compose.ui.Modifier

/**

 * Concatenates this modifier with another if `condition` is true.

 *

 * @param condition Whether or not to apply the modifiers.

 * @param factory Creates the modifier to concatenate with the current one.

 * @return a Modifier representing this modifier followed by other in sequence.

 * @see Modifier.then

 *

 * This method allows inline conditional addition of modifiers to a modifier chain. Instead of

 * writing

 *

 * ```

 * val aModifier = Modifier.a()

 * val bModifier = if(condition) aModifier.b() else aModifier

 * Composable(modifier = bModifier)

 * ```

 *

 * You can instead write

 *

 * ```

 * Composable(modifier = Modifier.a().thenIf(condition){

 *  Modifier.b()

 * }

 * ```

 *

 * This makes the modifier chain easier to read.

 *

 * Note that unlike the non-factory version, the conditional modifier is recreated each time, and

 * may never be created at all.

 */

inline fun Modifier.thenIf(condition: Boolean, crossinline factory: () -> Modifier): Modifier =

    if (condition) this.then(factory()) else this