Small tweaks to the stack curve and header transition. (Bug 16656169)

Change-Id: I96120063a66f267ad0b6a39b3dd020bc030083b8

5 files changed, 26 insertions, 12 deletions

diff --git a/packages/SystemUI/res/values/dimens.xml b/packages/SystemUI/res/values/dimens.xml
index 5415d19..1b8eeb2 100644
--- a/packages/SystemUI/res/values/dimens.xml
+++ b/packages/SystemUI/res/values/dimens.xml
@@ -205,10 +205,10 @@
     <dimen name="recents_task_view_rounded_corners_radius">2dp</dimen>
 
     <!-- The min translation in the Z index for the last task. -->
-    <dimen name="recents_task_view_z_min">5dp</dimen>
+    <dimen name="recents_task_view_z_min">25dp</dimen>
 
     <!-- The max translation in the Z index for the last task. -->
-    <dimen name="recents_task_view_z_max">65dp</dimen>
+    <dimen name="recents_task_view_z_max">100dp</dimen>
 
     <!-- The amount to translate when animating the removal of a task. -->
     <dimen name="recents_task_view_remove_anim_translation_x">100dp</dimen>
diff --git a/packages/SystemUI/res/values/styles.xml b/packages/SystemUI/res/values/styles.xml
index 27e58a4..48a031a 100644
--- a/packages/SystemUI/res/values/styles.xml
+++ b/packages/SystemUI/res/values/styles.xml
@@ -21,11 +21,23 @@
     </style>
 
     <!-- Alternate Recents theme -->
-    <style name="RecentsTheme" parent="@android:style/Theme.DeviceDefault.Wallpaper.NoTitleBar">
+    <style name="RecentsTheme" parent="@android:style/Theme">
+        <!-- NoTitle -->
+        <item name="android:windowNoTitle">true</item>
+        <!-- Wallpaper -->
+        <item name="android:windowBackground">@color/transparent</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
+        <item name="android:windowShowWallpaper">true</item>
+        <!-- Misc -->
         <item name="android:statusBarColor">@android:color/transparent</item>
         <item name="android:navigationBarColor">@android:color/transparent</item>
         <item name="android:windowDrawsSystemBarBackgrounds">true</item>
         <item name="android:windowAnimationStyle">@style/Animation.RecentsActivity</item>
+        <item name="*android:lightingStyle">@style/RecentsLighting</item>
+    </style>
+
+    <style name="RecentsLighting" parent="@*android:style/Lighting">
+        <item name="*android:ambientShadowAlpha">0.30</item>
     </style>
 
     <!-- Animations for a non-full-screen window or activity. -->
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackViewLayoutAlgorithm.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackViewLayoutAlgorithm.java
index 667faa7..f0bdfa2 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackViewLayoutAlgorithm.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackViewLayoutAlgorithm.java
@@ -53,7 +53,7 @@ public class TaskStackViewLayoutAlgorithm {
 
     // Log function
     static final float XScale = 1.75f;  // The large the XScale, the longer the flat area of the curve
-    static final float LogBase = 300;
+    static final float LogBase = 3000;
     static final int PrecisionSteps = 250;
     static float[] xp;
     static float[] px;
@@ -84,7 +84,7 @@ public class TaskStackViewLayoutAlgorithm {
                 left + size, mStackRect.top + size);
 
         // Update the affiliation offsets
-        float visibleTaskPct = 0.55f;
+        float visibleTaskPct = 0.5f;
         mWithinAffiliationOffset = mConfig.taskBarHeight;
         mBetweenAffiliationOffset = (int) (visibleTaskPct * mTaskRect.height());
     }
@@ -312,4 +312,4 @@ public class TaskStackViewLayoutAlgorithm {
         }
         return px[xFloorIndex] + pFraction;
     }
-}
\ No newline at end of file
+}
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
index 5914b39..a0e5e44 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
@@ -57,7 +57,7 @@ public class TaskView extends FrameLayout implements Task.TaskCallbacks,
     ObjectAnimator mDimAnimator;
     float mMaxDimScale;
     int mDim;
-    AccelerateInterpolator mDimInterpolator = new AccelerateInterpolator(1.25f);
+    AccelerateInterpolator mDimInterpolator = new AccelerateInterpolator(1f);
     PorterDuffColorFilter mDimColorFilter = new PorterDuffColorFilter(0, PorterDuff.Mode.MULTIPLY);
 
     Task mTask;
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewHeader.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewHeader.java
index 4b09549..dbfd001 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewHeader.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewHeader.java
@@ -211,13 +211,14 @@ class TaskViewHeader extends FrameLayout {
     void startEnterRecentsAnimation(int delay, Runnable postAnimRunnable) {
         // Animate the task bar of the first task view
         setVisibility(View.VISIBLE);
-        setTranslationY(-getMeasuredHeight());
+        setAlpha(0f);
         animate()
-                .translationY(0)
+                .alpha(1f)
                 .setStartDelay(delay)
-                .setInterpolator(mConfig.fastOutSlowInInterpolator)
+                .setInterpolator(mConfig.linearOutSlowInInterpolator)
                 .setDuration(mConfig.taskBarEnterAnimDuration)
                 .withEndAction(postAnimRunnable)
+                .withLayer()
                 .start();
     }
 
@@ -225,9 +226,9 @@ class TaskViewHeader extends FrameLayout {
     void startLaunchTaskAnimation(Runnable preAnimRunnable, final Runnable postAnimRunnable) {
         // Animate the task bar out of the first task view
         animate()
-                .translationY(-getMeasuredHeight())
+                .alpha(0f)
                 .setStartDelay(0)
-                .setInterpolator(mConfig.fastOutLinearInInterpolator)
+                .setInterpolator(mConfig.linearOutSlowInInterpolator)
                 .setDuration(mConfig.taskBarExitAnimDuration)
                 .withStartAction(preAnimRunnable)
                 .withEndAction(new Runnable() {
@@ -236,6 +237,7 @@ class TaskViewHeader extends FrameLayout {
                         post(postAnimRunnable);
                     }
                 })
+                .withLayer()
                 .start();
     }