kba.kt

// ======================= WINDOW INSETS =======================

fun View.addSystemTopPadding(
        targetView: View = this,
        isConsumed: Boolean = false
) {
    doOnApplyWindowInsets { _, insets, initialPadding ->
        targetView.updatePadding(
                top = initialPadding.top + insets.systemWindowInsetTop
        )
        if (isConsumed) {
            val modified = Insets.of(
                insets.systemWindowInsetLeft,
                0,
                insets.systemWindowInsetRight,
                insets.systemWindowInsetBottom
            )

            WindowInsetsCompat.Builder(insets)
                .setSystemWindowInsets(modified)
                .build()
        } else {
            insets
        }
    }
}

fun View.addSystemBottomPadding(
        targetView: View = this,
        isConsumed: Boolean = false
) {
    doOnApplyWindowInsets { _, insets, initialPadding ->
        targetView.updatePadding(
                bottom = initialPadding.bottom + insets.systemWindowInsetBottom
        )
        if (isConsumed) {
            val modified = Insets.of(
                insets.systemWindowInsetLeft,
                insets.systemWindowInsetTop,
                insets.systemWindowInsetRight,
                0
            )

            WindowInsetsCompat.Builder(insets)
                .setSystemWindowInsets(modified)
                .build()
        } else {
            insets
        }
    }
}

fun View.doOnApplyWindowInsets(block: (View, insets: WindowInsetsCompat, initialPadding: Rect) -> WindowInsetsCompat) {
    val initialPadding = recordInitialPaddingForView(this)
    ViewCompat.setOnApplyWindowInsetsListener(this) { v, insets ->
        block(v, insets, initialPadding)
    }
    requestApplyInsetsWhenAttached()
}

typealias KeyboardStateListener = (isShowed: Boolean) -> Unit

private val keyboardSize = 100.dp

/**
 * @note Keyboard aware state adds navigation bar height to bottom padding when keyboard is hidden or showed too
 */
fun View.keyboardAware(
        updatePaddingWithKeyboard: Boolean = true,
        keyboardCallback: KeyboardStateListener = {}
) {
    doOnApplyWindowInsets { _, insets, initialPadding ->
        if (updatePaddingWithKeyboard) {
            updatePadding(bottom = initialPadding.bottom + insets.systemWindowInsetBottom)
        }
        keyboardCallback(insets.systemWindowInsetBottom >= keyboardSize)
        insets
    }
}

private fun recordInitialPaddingForView(view: View) =
        Rect(view.paddingLeft, view.paddingTop, view.paddingRight, view.paddingBottom)

private fun View.requestApplyInsetsWhenAttached() {
    if (isAttachedToWindow) {
        ViewCompat.requestApplyInsets(this)
    } else {
        addOnAttachStateChangeListener(object : View.OnAttachStateChangeListener {
            override fun onViewAttachedToWindow(v: View) {
                v.removeOnAttachStateChangeListener(this)
                ViewCompat.requestApplyInsets(v)
            }

            override fun onViewDetachedFromWindow(v: View) = Unit
        })
    }
}

// ======================= WINDOW INSETS =======================