WindowExtensions.kt

import android.annotation.SuppressLint
import android.view.View
import android.view.ViewGroup
import android.view.Window
import androidx.core.graphics.Insets
import androidx.core.view.ViewCompat
import androidx.core.view.WindowCompat
import androidx.core.view.WindowInsetsCompat
import androidx.core.view.WindowInsetsCompat.Type.InsetsType
import androidx.core.view.updateLayoutParams
import androidx.core.view.updateMargins


/**
 * @author Created by Abdullah Essa on 23.09.21.
 */


/**
 * Apply the given [WindowInsetsCompat.Type] to the window
 * HINT: This makes the screen scrollable (without scrollable layout in the screen) if the soft keyboard is visible
 *       to the user
 * @param view  the root view of the Activity or the Fragment (e.g.: fragment.getView()).
 */
fun Window.applyKeyboardInsets(
    view: View
) = applyInsets(
    view = view,
    WindowInsetsCompat.Type.systemBars(),
    WindowInsetsCompat.Type.ime(),
)


/**
 * Apply the given [WindowInsetsCompat.Type] to the window
 */
private fun Window.applyInsets(
    view: View,
    @InsetsType vararg insetTypes: Int
) {
    @SuppressLint("WrongConstant")
    @InsetsType val insetTypeMask: Int = insetTypes.fold(0) { total: Int, type: Int -> total or type }

    WindowCompat.setDecorFitsSystemWindows(this, false)
    ViewCompat.setOnApplyWindowInsetsListener(view) { v: View, _ -> v.applyInsets(insetTypeMask) }
}


/**
 * Apply the given [WindowInsetsCompat.Type] to the view
 */
private fun View.applyInsets(
    @InsetsType typeMask: Int
): WindowInsetsCompat? {
    val rootWindowInsets: WindowInsetsCompat = ViewCompat.getRootWindowInsets(this) ?: return null
    val insets: Insets = rootWindowInsets.getInsets(typeMask)

    updateLayoutParams<ViewGroup.MarginLayoutParams> {
        updateMargins(
            left = insets.left,
            top = insets.top,
            right = insets.right,
            bottom = insets.bottom
        )
    }

    return WindowInsetsCompat.Builder()
        .setInsets(typeMask, insets)
        .build()
}