Convenience FragmentManager extension functions.

FragmentManager.kt

import androidx.fragment.app.DialogFragment
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentFactory
import androidx.fragment.app.FragmentManager

/**
 * Create a new instance of a [Fragment] with the given class name. This uses
 * [FragmentFactory.loadFragmentClass] and the empty constructor of the resulting
 * [Class] by default.
 *
 * This is a convenience for explicitly creating the fragment with [FragmentFactory],
 * passing the classLoader and className, and casting to the right fragment type.
 */
inline fun <reified T : Fragment> FragmentManager.instantiate(
    block: (fragment: T) -> Unit = {},
): T {
    val classLoader = requireNotNull(T::class.java.classLoader)
    return (fragmentFactory.instantiate(classLoader, T::class.java.name) as T).apply(block)
}

/**
 * Display the dialog, adding the fragment to the [FragmentManager].
 *
 * This is a convenience for explicitly creating the fragment and transaction,
 * adding the fragment to it with the given tag, and committing it
 *
 * This does **not** add the transaction to the fragment back stack. When the
 * fragment is dismissed, a new transaction will be executed to remove it from
 * the activity.
 */
inline fun <reified T : DialogFragment> FragmentManager.showDialog(
    tag: String? = null,
    block: (dialog: T) -> Unit = {},
) {
    instantiate<T>().apply(block).show(this, tag)
}