Merge "Find a background to animate when launching a dialog or activity" into tm-dev am: 18906f73ef (b32b4d58) · Commits · e / os / android_frameworks_base

packages/SystemUI/animation/src/com/android/systemui/animation/GhostedViewLaunchAnimatorController.kt

+40 −10

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@ import android.view.ViewGroup
		import android.view.ViewGroupOverlay
		import android.widget.FrameLayout
		import com.android.internal.jank.InteractionJankMonitor
		import java.util.LinkedList
		import kotlin.math.min

		private const val TAG = "GhostedViewLaunchAnimatorController"
		@@ -81,21 +82,51 @@ open class GhostedViewLaunchAnimatorController(
		* [backgroundView].
		*/
		private var backgroundDrawable: WrappedDrawable? = null
		private val backgroundInsets by lazy { getBackground()?.opticalInsets ?: Insets.NONE }
		private val backgroundInsets by lazy { background?.opticalInsets ?: Insets.NONE }
		private var startBackgroundAlpha: Int = 0xFF

		private val ghostedViewLocation = IntArray(2)
		private val ghostedViewState = LaunchAnimator.State()

		/**
		* Return the background of the [ghostedView]. This background will be used to draw the
		* background of the background view that is expanding up to the final animation position. This
		* is called at the start of the animation.
		* The background of the [ghostedView]. This background will be used to draw the background of
		* the background view that is expanding up to the final animation position.
		*
		* Note that during the animation, the alpha value value of this background will be set to 0,
		* then set back to its initial value at the end of the animation.
		*/
		protected open fun getBackground(): Drawable? = ghostedView.background
		private val background: Drawable?

		init {
		/** Find the first view with a background in [view] and its children. */
		fun findBackground(view: View): Drawable? {
		if (view.background != null) {
		return view.background
		}

		// Perform a BFS to find the largest View with background.
		val views = LinkedList<View>().apply {
		add(view)
		}

		while (views.isNotEmpty()) {
		val v = views.removeFirst()
		if (v.background != null) {
		return v.background
		}

		if (v is ViewGroup) {
		for (i in 0 until v.childCount) {
		views.add(v.getChildAt(i))
		}
		}
		}

		return null
		}

		background = findBackground(ghostedView)
		}

		/**
		* Set the corner radius of [background]. The background is the one that was returned by
		@@ -113,7 +144,7 @@ open class GhostedViewLaunchAnimatorController(

		/** Return the current top corner radius of the background. */
		protected open fun getCurrentTopCornerRadius(): Float {
		val drawable = getBackground() ?: return 0f
		val drawable = background ?: return 0f
		val gradient = findGradientDrawable(drawable) ?: return 0f

		// TODO(b/184121838): Support more than symmetric top & bottom radius.
		@@ -122,7 +153,7 @@ open class GhostedViewLaunchAnimatorController(

		/** Return the current bottom corner radius of the background. */
		protected open fun getCurrentBottomCornerRadius(): Float {
		val drawable = getBackground() ?: return 0f
		val drawable = background ?: return 0f
		val gradient = findGradientDrawable(drawable) ?: return 0f

		// TODO(b/184121838): Support more than symmetric top & bottom radius.
		@@ -162,9 +193,8 @@ open class GhostedViewLaunchAnimatorController(

		// We wrap the ghosted view background and use it to draw the expandable background. Its
		// alpha will be set to 0 as soon as we start drawing the expanding background.
		val drawable = getBackground()
		startBackgroundAlpha = drawable?.alpha ?: 0xFF
		backgroundDrawable = WrappedDrawable(drawable)
		startBackgroundAlpha = background?.alpha ?: 0xFF
		backgroundDrawable = WrappedDrawable(background)
		backgroundView?.background = backgroundDrawable

		// Create a ghost of the view that will be moving and fading out. This allows to fade out