Start springs for All Apps when user flings up.

Bug: 77695481
Change-Id: Ifecfbbb89601947118f620f522662aee8a61946e

src/com/android/launcher3/allapps/AllAppsContainerView.java

@@ -15,12 +15,14 @@
  */
 package com.android.launcher3.allapps;
 
+import android.animation.ValueAnimator;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.os.Process;
+import android.support.animation.DynamicAnimation;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.annotation.StringRes;
@@ -61,6 +63,10 @@ import com.android.launcher3.views.SpringRelativeLayout;
 public class AllAppsContainerView extends SpringRelativeLayout implements DragSource,
         Insettable, OnDeviceProfileChangeListener {
 
+    private static final float FLING_VELOCITY_MULTIPLIER = 135f;
+    // Starts the springs after at least 55% of the animation has passed.
+    private static final float FLING_ANIMATION_THRESHOLD = 0.55f;
+
     private final Launcher mLauncher;
     private final AdapterHolder[] mAH;
     private final ItemInfoMatcher mPersonalMatcher = ItemInfoMatcher.ofUser(Process.myUserHandle());
@@ -455,6 +461,32 @@ public class AllAppsContainerView extends SpringRelativeLayout implements DragSo
         }
     }
 
+    /**
+     * Adds an update listener to {@param animator} that adds springs to the animation.
+     */
+    public void addSpringFromFlingUpdateListener(ValueAnimator animator, float velocity) {
+        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator valueAnimator) {
+                if (valueAnimator.getAnimatedFraction() >= FLING_ANIMATION_THRESHOLD) {
+                    int searchViewId = getSearchView().getId();
+                    addSpringView(searchViewId);
+
+                    finishWithShiftAndVelocity(1, velocity * FLING_VELOCITY_MULTIPLIER,
+                            new DynamicAnimation.OnAnimationEndListener() {
+                                @Override
+                                public void onAnimationEnd(DynamicAnimation animation,
+                                        boolean canceled, float value, float velocity) {
+                                    removeSpringView(searchViewId);
+                                }
+                            });
+
+                    animator.removeUpdateListener(this);
+                }
+            }
+        });
+    }
+
     public class AdapterHolder {
         public static final int MAIN = 0;
         public static final int WORK = 1;

src/com/android/launcher3/touch/AbstractStateChangeTouchController.java

@@ -396,6 +396,9 @@ public abstract class AbstractStateChangeTouchController
         updateSwipeCompleteAnimation(anim, Math.max(duration, getRemainingAtomicDuration()),
                 targetState, velocity, fling);
         mCurrentAnimation.dispatchOnStart();
+        if (fling && targetState == LauncherState.ALL_APPS) {
+            mLauncher.getAppsView().addSpringFromFlingUpdateListener(anim, velocity);
+        }
         anim.start();
         if (mAtomicAnim == null) {
             startAtomicComponentsAnim(endProgress, anim.getDuration());

src/com/android/launcher3/views/SpringRelativeLayout.java

@@ -17,6 +17,7 @@ package com.android.launcher3.views;
 
 import android.content.Context;
 import android.graphics.Canvas;
+import android.support.animation.DynamicAnimation;
 import android.support.animation.FloatPropertyCompat;
 import android.support.animation.SpringAnimation;
 import android.support.animation.SpringForce;
@@ -79,6 +80,11 @@ public class SpringRelativeLayout extends RelativeLayout {
         mSpringViews.put(id, true);
     }
 
+    public void removeSpringView(int id) {
+        mSpringViews.delete(id);
+        invalidate();
+    }
+
     @Override
     protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
         if (mDampedScrollShift != 0 && mSpringViews.get(child.getId())) {
@@ -110,6 +116,13 @@ public class SpringRelativeLayout extends RelativeLayout {
         mSpring.start();
     }
 
+    protected void finishWithShiftAndVelocity(float shift, float velocity,
+            DynamicAnimation.OnAnimationEndListener listener) {
+        setDampedScrollShift(shift);
+        mSpring.addEndListener(listener);
+        finishScrollWithVelocity(velocity);
+    }
+
     public EdgeEffectFactory createEdgeEffectFactory() {
         return new SpringEdgeEffectFactory();
     }