Make BottomSheet`s handle fit top window inset

app/src/main/java/org/koitharu/kotatsu/base/ui/widgets/BottomSheetHeaderBar.kt

@@ -2,15 +2,11 @@ package org.koitharu.kotatsu.base.ui.widgets
 
 import android.animation.LayoutTransition
 import android.content.Context
-import android.transition.AutoTransition
-import android.transition.TransitionManager
 import android.util.AttributeSet
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.view.WindowInsets
-import android.view.animation.AccelerateDecelerateInterpolator
-import android.view.animation.DecelerateInterpolator
 import androidx.annotation.AttrRes
 import androidx.annotation.StringRes
 import androidx.appcompat.widget.Toolbar
@@ -43,7 +39,10 @@ class BottomSheetHeaderBar @JvmOverloads constructor(
 	private val locationBuffer = IntArray(2)
 	private val expansionListeners = LinkedList<OnExpansionChangeListener>()
 	private var fitStatusBar = false
-	private var transition: AutoTransition? = null
+	private val minHandleHeight = context.resources.getDimensionPixelSize(R.dimen.bottom_sheet_handle_size_min)
+	private val maxHandleHeight = context.resources.getDimensionPixelSize(R.dimen.bottom_sheet_handle_size_max)
+	private var isLayoutSuppressedCompat = false
+	private var isLayoutCalledWhileSuppressed = false
 
 	@Deprecated("")
 	val toolbar: MaterialToolbar
@@ -156,6 +155,14 @@ class BottomSheetHeaderBar @JvmOverloads constructor(
 		binding.toolbar.setSubtitle(resId)
 	}
 
+	override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
+		if (isLayoutSuppressedCompat) {
+			isLayoutCalledWhileSuppressed = true
+		} else {
+			super.onLayout(changed, l, t, r, b)
+		}
+	}
+
 	private fun setBottomSheetBehavior(behavior: BottomSheetBehavior<*>?) {
 		bottomSheetBehavior?.removeBottomSheetCallback(bottomSheetCallback)
 		bottomSheetBehavior = behavior
@@ -170,11 +177,21 @@ class BottomSheetHeaderBar @JvmOverloads constructor(
 		if (isExpanded == binding.dragHandle.isGone) {
 			return
 		}
-		TransitionManager.beginDelayedTransition(this, getTransition())
+		suppressLayoutCompat(true)
 		binding.toolbar.navigationIcon = (if (isExpanded) closeDrawable else null)
 		binding.dragHandle.isGone = isExpanded
 		expansionListeners.forEach { it.onExpansionStateChanged(this, isExpanded) }
 		dispatchInsets(ViewCompat.getRootWindowInsets(this))
+		suppressLayoutCompat(false)
+	}
+
+	private fun suppressLayoutCompat(suppress: Boolean) {
+		if (suppress == isLayoutSuppressedCompat) return
+		isLayoutSuppressedCompat = suppress
+		if (!suppress && isLayoutCalledWhileSuppressed) {
+			requestLayout()
+		}
+		isLayoutCalledWhileSuppressed = false
 	}
 
 	private fun dispatchInsets(insets: WindowInsetsCompat?) {
@@ -182,11 +199,14 @@ class BottomSheetHeaderBar @JvmOverloads constructor(
 			return
 		}
 		val isExpanded = binding.dragHandle.isGone
+		val topInset = insets?.getInsets(WindowInsetsCompat.Type.systemBars())?.top ?: 0
 		if (isExpanded) {
-			val topInset = insets?.getInsets(WindowInsetsCompat.Type.systemBars())?.top ?: 0
 			updatePadding(top = topInset)
 		} else {
 			updatePadding(top = 0)
+			binding.dragHandle.updateLayoutParams {
+				height = topInset.coerceIn(minHandleHeight, maxHandleHeight)
+			}
 		}
 	}
 
@@ -225,7 +245,7 @@ class BottomSheetHeaderBar @JvmOverloads constructor(
 			return true
 		}
 		val viewId = child.id
-		return viewId == R.id.dragHandle || viewId == R.id.toolbar || viewId == R.id.frame
+		return viewId == R.id.dragHandle || viewId == R.id.toolbar
 	}
 
 	private fun convertLayoutParams(params: ViewGroup.LayoutParams?): Toolbar.LayoutParams? {
@@ -242,15 +262,6 @@ class BottomSheetHeaderBar @JvmOverloads constructor(
 		}
 	}
 
-	private fun getTransition(): AutoTransition {
-		transition?.let { return it }
-		val t = AutoTransition()
-		t.duration = context.getAnimationDuration(android.R.integer.config_shortAnimTime)
-		t.addTarget(binding.dragHandle)
-		transition = t
-		return t
-	}
-
 	private inner class Callback : BottomSheetBehavior.BottomSheetCallback(), View.OnClickListener {
 
 		override fun onStateChanged(bottomSheet: View, newState: Int) {

app/src/main/res/layout/layout_sheet_header.xml

@@ -6,27 +6,20 @@
 	android:layout_height="wrap_content"
 	tools:parentTag="com.google.android.material.appbar.AppBarLayout">
 
-	<FrameLayout
-		android:id="@+id/frame"
+	<com.google.android.material.bottomsheet.BottomSheetDragHandleView
+		android:id="@+id/dragHandle"
 		android:layout_width="match_parent"
-		android:layout_height="?attr/actionBarSize">
+		android:layout_height="@dimen/bottom_sheet_handle_size_min"
+		android:minHeight="0dp"
+		android:paddingTop="12dp"
+		android:paddingBottom="0dp" />
 
-		<com.google.android.material.appbar.MaterialToolbar
-			android:id="@+id/toolbar"
-			android:layout_width="match_parent"
-			android:layout_height="?attr/actionBarSize"
-			android:theme="@style/ThemeOverlay.Kotatsu.MainToolbar"
-			tools:navigationIcon="?actionModeCloseDrawable"
-			tools:title="@string/options" />
-
-		<com.google.android.material.bottomsheet.BottomSheetDragHandleView
-			android:id="@+id/dragHandle"
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"
-			android:minHeight="0dp"
-			android:paddingTop="12dp"
-			android:paddingBottom="0dp" />
-
-	</FrameLayout>
+	<com.google.android.material.appbar.MaterialToolbar
+		android:id="@+id/toolbar"
+		android:layout_width="match_parent"
+		android:layout_height="?attr/actionBarSize"
+		android:theme="@style/ThemeOverlay.Kotatsu.MainToolbar"
+		tools:navigationIcon="?actionModeCloseDrawable"
+		tools:title="@string/options" />
 
 </merge>

app/src/main/res/values/dimens.xml

@@ -35,6 +35,8 @@
 	<dimen name="search_suggestions_manga_spacing">4dp</dimen>
 
 	<dimen name="bottom_sheet_width">0dp</dimen>
+	<dimen name="bottom_sheet_handle_size_min">16dp</dimen>
+	<dimen name="bottom_sheet_handle_size_max">24dp</dimen>
 	<dimen name="dialog_radius">8dp</dimen>
 
 	<dimen name="appwidget_corner_radius_inner">8dp</dimen>