Merge "Added new interpolator spec to be used throughout all of our motion" into sc-v2-dev

packages/SystemUI/animation/src/com/android/systemui/animation/Interpolators.java

@@ -16,6 +16,7 @@
 
 package com.android.systemui.animation;
 
+import android.graphics.Path;
 import android.util.MathUtils;
 import android.view.animation.AccelerateDecelerateInterpolator;
 import android.view.animation.AccelerateInterpolator;
@@ -29,7 +30,97 @@ import android.view.animation.PathInterpolator;
  * Utility class to receive interpolators from
  */
 public class Interpolators {
-    public static final Interpolator FAST_OUT_SLOW_IN = new PathInterpolator(0.4f, 0f, 0.2f, 1f);
+
+    /*
+     * ============================================================================================
+     * Emphasized interpolators.
+     * ============================================================================================
+     */
+
+    /**
+     * The default emphasized interpolator. Used for hero / emphasized movement of content.
+     */
+    public static final Interpolator EMPHASIZED = createEmphasizedInterpolator();
+
+    /**
+     * The accelerated emphasized interpolator. Used for hero / emphasized movement of content that
+     * is disappearing e.g. when moving off screen.
+     */
+    public static final Interpolator EMPHASIZED_ACCELERATE = new PathInterpolator(
+            0.3f, 0f, 0.8f, 0.15f);
+
+    /**
+     * The decelerating emphasized interpolator. Used for hero / emphasized movement of content that
+     * is appearing e.g. when coming from off screen
+     */
+    public static final Interpolator EMPHASIZED_DECELERATE = new PathInterpolator(
+            0.05f, 0.7f, 0.1f, 1f);
+
+
+    /*
+     * ============================================================================================
+     * Standard interpolators.
+     * ============================================================================================
+     */
+
+    /**
+     * The standard interpolator that should be used on every normal animation
+     */
+    public static final Interpolator STANDARD = new PathInterpolator(
+            0.2f, 0f, 0f, 1f);
+
+    /**
+     * The standard accelerating interpolator that should be used on every regular movement of
+     * content that is disappearing e.g. when moving off screen.
+     */
+    public static final Interpolator STANDARD_ACCELERATE = new PathInterpolator(
+            0.3f, 0f, 1f, 1f);
+
+    /**
+     * The standard decelerating interpolator that should be used on every regular movement of
+     * content that is appearing e.g. when coming from off screen.
+     */
+    public static final Interpolator STANDARD_DECELERATE = new PathInterpolator(
+            0f, 0f, 0f, 1f);
+
+    /*
+     * ============================================================================================
+     * Legacy
+     * ============================================================================================
+     */
+
+    /**
+     * The default legacy interpolator as defined in Material 1. Also known as FAST_OUT_SLOW_IN.
+     */
+    public static final Interpolator LEGACY = new PathInterpolator(0.4f, 0f, 0.2f, 1f);
+
+    /**
+     * The default legacy accelerating interpolator as defined in Material 1.
+     * Also known as FAST_OUT_LINEAR_IN.
+     */
+    public static final Interpolator LEGACY_ACCELERATE = new PathInterpolator(0.4f, 0f, 1f, 1f);
+
+    /**
+     * The default legacy decelerating interpolator as defined in Material 1.
+     * Also known as LINEAR_OUT_SLOW_IN.
+     */
+    public static final Interpolator LEGACY_DECELERATE = new PathInterpolator(0f, 0f, 0.2f, 1f);
+
+    /**
+     * Linear interpolator. Often used if the interpolator is for different properties who need
+     * different interpolations.
+     */
+    public static final Interpolator LINEAR = new LinearInterpolator();
+
+    /*
+    * ============================================================================================
+    * Custom interpolators
+    * ============================================================================================
+    */
+
+    public static final Interpolator FAST_OUT_SLOW_IN = LEGACY;
+    public static final Interpolator FAST_OUT_LINEAR_IN = LEGACY_ACCELERATE;
+    public static final Interpolator LINEAR_OUT_SLOW_IN = LEGACY_DECELERATE;
 
     /**
      * Like {@link #FAST_OUT_SLOW_IN}, but used in case the animation is played in reverse (i.e. t
@@ -37,12 +128,9 @@ public class Interpolators {
      */
     public static final Interpolator FAST_OUT_SLOW_IN_REVERSE =
             new PathInterpolator(0.8f, 0f, 0.6f, 1f);
-    public static final Interpolator FAST_OUT_LINEAR_IN = new PathInterpolator(0.4f, 0f, 1f, 1f);
-    public static final Interpolator LINEAR_OUT_SLOW_IN = new PathInterpolator(0f, 0f, 0.2f, 1f);
     public static final Interpolator SLOW_OUT_LINEAR_IN = new PathInterpolator(0.8f, 0f, 1f, 1f);
     public static final Interpolator ALPHA_IN = new PathInterpolator(0.4f, 0f, 1f, 1f);
     public static final Interpolator ALPHA_OUT = new PathInterpolator(0f, 0f, 0.8f, 1f);
-    public static final Interpolator LINEAR = new LinearInterpolator();
     public static final Interpolator ACCELERATE = new AccelerateInterpolator();
     public static final Interpolator ACCELERATE_DECELERATE = new AccelerateDecelerateInterpolator();
     public static final Interpolator DECELERATE_QUINT = new DecelerateInterpolator(2.5f);
@@ -72,6 +160,12 @@ public class Interpolators {
     public static final Interpolator TOUCH_RESPONSE_REVERSE =
             new PathInterpolator(0.9f, 0f, 0.7f, 1f);
 
+    /*
+     * ============================================================================================
+     * Functions / Utilities
+     * ============================================================================================
+     */
+
     /**
      * Calculate the amount of overshoot using an exponential falloff function with desired
      * properties, where the overshoot smoothly transitions at the 1.0f boundary into the
@@ -122,4 +216,14 @@ public class Interpolators {
             return (float) (1f - 0.5f * (1f - Math.cos(3.14159f * oneMinusFrac * oneMinusFrac)));
         }
     }
+
+    // Create the default emphasized interpolator
+    private static PathInterpolator createEmphasizedInterpolator() {
+        Path path = new Path();
+        // Doing the same as fast_out_extra_slow_in
+        path.moveTo(0f, 0f);
+        path.cubicTo(0.05f, 0f, 0.133333f, 0.06f, 0.166666f, 0.4f);
+        path.cubicTo(0.208333f, 0.82f, 0.25f, 1f, 1f, 1f);
+        return new PathInterpolator(path);
+    }
 }