Add OnControllableInsetsChangedListener

It's useful for apps to know which inset types they can currently
control, as otherwise they have to poll by calling
controlInsetsAnimation repeatedly.

This can be used when apps want to apply a custom animation
immediately during startup as soon as possible.

Fixes: 150780468
Test: InsetsControllerTest
Test: CTS will be added soon
Test: WindowInsetsActivity
Change-Id: Ic0388c11d759843d3ac9edd8ef23904c9ce05c46

1 files changed, 55 insertions, 4 deletions

diff --git a/tests/WindowInsetsTests/src/com/google/android/test/windowinsetstests/WindowInsetsActivity.java b/tests/WindowInsetsTests/src/com/google/android/test/windowinsetstests/WindowInsetsActivity.java
index 8e6f1985a7d9..e41517085c36 100644
--- a/tests/WindowInsetsTests/src/com/google/android/test/windowinsetstests/WindowInsetsActivity.java
+++ b/tests/WindowInsetsTests/src/com/google/android/test/windowinsetstests/WindowInsetsActivity.java
@@ -16,11 +16,15 @@
 
 package com.google.android.test.windowinsetstests;
 
+import static android.view.WindowInsets.Type.ime;
 import static android.view.WindowInsetsAnimation.Callback.DISPATCH_MODE_STOP;
 
 import static java.lang.Math.max;
 import static java.lang.Math.min;
 
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ValueAnimator;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.Context;
@@ -37,6 +41,8 @@ import android.view.WindowInsetsAnimation;
 import android.view.WindowInsetsAnimation.Callback;
 import android.view.WindowInsetsAnimationControlListener;
 import android.view.WindowInsetsAnimationController;
+import android.view.WindowInsetsController;
+import android.view.WindowInsetsController.OnControllableInsetsChangedListener;
 import android.view.animation.LinearInterpolator;
 import android.widget.LinearLayout;
 
@@ -82,8 +88,8 @@ public class WindowInsetsActivity extends AppCompatActivity {
                 switch (event.getAction()) {
                     case MotionEvent.ACTION_DOWN:
                         mDown = event.getY();
-                        mDownInsets = v.getRootWindowInsets().getInsets(Type.ime());
-                        mShownAtDown = v.getRootWindowInsets().isVisible(Type.ime());
+                        mDownInsets = v.getRootWindowInsets().getInsets(ime());
+                        mShownAtDown = v.getRootWindowInsets().isVisible(ime());
                         mRequestedController = false;
                         mCurrentRequest = null;
                         break;
@@ -94,7 +100,7 @@ public class WindowInsetsActivity extends AppCompatActivity {
                                 > mViewConfiguration.getScaledTouchSlop()
                                 && !mRequestedController) {
                             mRequestedController = true;
-                            v.getWindowInsetsController().controlWindowInsetsAnimation(Type.ime(),
+                            v.getWindowInsetsController().controlWindowInsetsAnimation(ime(),
                                     1000, new LinearInterpolator(),
                                     mCurrentRequest = new WindowInsetsAnimationControlListener() {
                                         @Override
@@ -189,6 +195,51 @@ public class WindowInsetsActivity extends AppCompatActivity {
         getWindow().getDecorView().post(() -> getWindow().setDecorFitsSystemWindows(false));
     }
 
+    @Override
+    public void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        getWindow().getInsetsController().addOnControllableInsetsChangedListener(
+                new OnControllableInsetsChangedListener() {
+
+                    boolean hasControl = false;
+                    @Override
+                    public void onControllableInsetsChanged(WindowInsetsController controller,
+                            int types) {
+                        if ((types & ime()) != 0 && !hasControl) {
+                            hasControl = true;
+                            controller.controlWindowInsetsAnimation(ime(), -1,
+                                    new LinearInterpolator(),
+                                    new WindowInsetsAnimationControlListener() {
+                                        @Override
+                                        public void onReady(
+                                                WindowInsetsAnimationController controller,
+                                                int types) {
+                                            ValueAnimator anim = ValueAnimator.ofFloat(0f, 1f);
+                                            anim.setDuration(1500);
+                                            anim.addUpdateListener(animation
+                                                    -> controller.setInsetsAndAlpha(
+                                                    controller.getShownStateInsets(),
+                                                    (float) animation.getAnimatedValue(),
+                                                    anim.getAnimatedFraction()));
+                                            anim.addListener(new AnimatorListenerAdapter() {
+                                                @Override
+                                                public void onAnimationEnd(Animator animation) {
+                                                    super.onAnimationEnd(animation);
+                                                    controller.finish(true);
+                                                }
+                                            });
+                                            anim.start();
+                                        }
+
+                                        @Override
+                                        public void onCancelled() {
+                                        }
+                                    });
+                        }
+                    }
+                });
+    }
+
     static class Transition {
         private int mEndBottom;
         private int mStartBottom;
@@ -200,7 +251,7 @@ public class WindowInsetsActivity extends AppCompatActivity {
         }
 
         void onPrepare(WindowInsetsAnimation animation) {
-            if ((animation.getTypeMask() & Type.ime()) != 0) {
+            if ((animation.getTypeMask() & ime()) != 0) {
                 mInsetsAnimation = animation;
             }
             mStartBottom = mView.getBottom();