Updating Recents to make the cards slightly more visible.

Change-Id: I876d39f4aac4007a3fe0c509ccb7db130f27a737

packages/SystemUI/res/layout/recents_nav_bar_scrim.xml

@@ -20,4 +20,4 @@
     android:layout_height="wrap_content"
     android:layout_gravity="center_horizontal|bottom"
     android:scaleType="fitXY"
-    android:src="@drawable/recents_nav_bar_background" />
+    android:src="@drawable/recents_lower_gradient" />

packages/SystemUI/src/com/android/systemui/recents/Constants.java

@@ -106,7 +106,7 @@ public class Constants {
             // The height of the peek space relative to the stack height
             public static final float StackPeekHeightPct = 0.1f;
             // The min scale of the last card in the peek area
-            public static final float StackPeekMinScale = 0.9f;
+            public static final float StackPeekMinScale = 0.8f;
             // The number of cards we see in the peek space
             public static final int StackPeekNumCards = 3;
         }

packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java

@@ -41,6 +41,8 @@ import com.android.systemui.recents.model.SpaceNode;
 import com.android.systemui.recents.model.TaskStack;
 import com.android.systemui.recents.views.RecentsView;
 
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Set;
 
@@ -79,6 +81,19 @@ public class RecentsActivity extends Activity implements RecentsView.RecentsView
     boolean mVisible;
     boolean mTaskLaunched;
 
+    private static Method sPropertyMethod;
+    static {
+        try {
+            Class<?> c = Class.forName("android.view.GLES20Canvas");
+            sPropertyMethod = c.getDeclaredMethod("setProperty", String.class, String.class);
+            if (!sPropertyMethod.isAccessible()) sPropertyMethod.setAccessible(true);
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (NoSuchMethodException e) {
+            e.printStackTrace();
+        }
+    }
+
     // Broadcast receiver to handle messages from our RecentsService
     BroadcastReceiver mServiceBroadcastReceiver = new BroadcastReceiver() {
         @Override
@@ -139,21 +154,12 @@ public class RecentsActivity extends Activity implements RecentsView.RecentsView
         // Add the default no-recents layout
         if (stacks.size() == 1 && stacks.get(0).getTaskCount() == 0) {
             mEmptyView.setVisibility(View.VISIBLE);
-
-            // Dim the background even more
-            WindowManager.LayoutParams wlp = getWindow().getAttributes();
-            wlp.dimAmount = Constants.Values.Window.DarkBackgroundDim;
-            getWindow().setAttributes(wlp);
-            getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
         } else {
             mEmptyView.setVisibility(View.GONE);
-
-            // Un-dim the background
-            WindowManager.LayoutParams wlp = getWindow().getAttributes();
-            wlp.dimAmount = 0f;
-            getWindow().setAttributes(wlp);
-            getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
         }
+
+        // Dim the background
+        mRecentsView.setBackgroundColor(0x80000000);
     }
 
     /** Attempts to allocate and bind the search bar app widget */
@@ -277,6 +283,9 @@ public class RecentsActivity extends Activity implements RecentsView.RecentsView
         LayoutInflater inflater = LayoutInflater.from(this);
         mEmptyView = inflater.inflate(R.layout.recents_empty, mContainerView, false);
         mNavBarScrimView = inflater.inflate(R.layout.recents_nav_bar_scrim, mContainerView, false);
+        mNavBarScrimView.setLayoutParams(new FrameLayout.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.BOTTOM));
 
         mContainerView = new FrameLayout(this);
         mContainerView.addView(mRecentsView);
@@ -296,6 +305,16 @@ public class RecentsActivity extends Activity implements RecentsView.RecentsView
         if (savedInstanceState != null) {
             onConfigurationChange();
         }
+
+        // XXX: Update the shadows
+        try {
+            sPropertyMethod.invoke(null, "ambientShadowStrength", String.valueOf(35f));
+            sPropertyMethod.invoke(null, "ambientRatio", String.valueOf(0.5f));
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        } catch (InvocationTargetException e) {
+            e.printStackTrace();
+        }
     }
 
     void onConfigurationChange() {

packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java

@@ -156,10 +156,12 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
         float boundedT = Math.max(t, -(numPeekCards + 1));
 
         // Set the scale relative to its position
+        int numFrontScaledCards = 3;
         float minScale = Constants.Values.TaskStackView.StackPeekMinScale;
         float scaleRange = 1f - minScale;
-        float scaleInc = scaleRange / numPeekCards;
+        float scaleInc = scaleRange / (numPeekCards + numFrontScaledCards);
-        float scale = Math.max(minScale, Math.min(1f, 1f + (boundedT * scaleInc)));
+        float scale = Math.max(minScale, Math.min(1f, minScale + 
+            ((boundedT + (numPeekCards + 1)) * scaleInc)));
         float scaleYOffset = ((1f - scale) * mTaskRect.height()) / 2;
         transform.scale = scale;
 
@@ -171,6 +173,12 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
             transform.translationY = (int) (boundedT * overlapHeight - scaleYOffset);
         }
 
+        // Set the z translation
+        RecentsConfiguration config = RecentsConfiguration.getInstance();
+        int minZ = config.taskViewTranslationZMinPx;
+        int incZ = config.taskViewTranslationZIncrementPx;
+        transform.translationZ = (int) Math.max(minZ, minZ + ((boundedT + numPeekCards) * incZ));
+
         // Set the alphas
         transform.dismissAlpha = Math.max(-1f, Math.min(0f, t + 1)) + 1f;
 

packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java

@@ -142,8 +142,6 @@ public class TaskView extends FrameLayout implements Task.TaskCallbacks, View.On
     void updateViewPropertiesToTaskTransform(TaskViewTransform animateFromTransform,
                                              TaskViewTransform toTransform, int duration) {
         RecentsConfiguration config = RecentsConfiguration.getInstance();
-        int minZ = config.taskViewTranslationZMinPx;
-        int incZ = config.taskViewTranslationZIncrementPx;
 
         // Update the bar view
         mBarView.updateViewPropertiesToTaskTransform(animateFromTransform, toTransform, duration);
@@ -153,14 +151,14 @@ public class TaskView extends FrameLayout implements Task.TaskCallbacks, View.On
             if (animateFromTransform != null) {
                 setTranslationY(animateFromTransform.translationY);
                 if (Constants.DebugFlags.App.EnableShadows) {
-                    setTranslationZ(Math.max(minZ, minZ + (animateFromTransform.t * incZ)));
+                    setTranslationZ(animateFromTransform.translationZ);
                 }
                 setScaleX(animateFromTransform.scale);
                 setScaleY(animateFromTransform.scale);
                 setAlpha(animateFromTransform.alpha);
             }
             if (Constants.DebugFlags.App.EnableShadows) {
-                animate().translationZ(Math.max(minZ, minZ + (toTransform.t * incZ)));
+                animate().translationZ(toTransform.translationZ);
             }
             animate().translationY(toTransform.translationY)
                     .scaleX(toTransform.scale)
@@ -179,7 +177,7 @@ public class TaskView extends FrameLayout implements Task.TaskCallbacks, View.On
         } else {
             setTranslationY(toTransform.translationY);
             if (Constants.DebugFlags.App.EnableShadows) {
-                setTranslationZ(Math.max(minZ, minZ + (toTransform.t * incZ)));
+                setTranslationZ(toTransform.translationZ);
             }
             setScaleX(toTransform.scale);
             setScaleY(toTransform.scale);

packages/SystemUI/src/com/android/systemui/recents/views/TaskViewTransform.java

@@ -22,6 +22,7 @@ import android.graphics.Rect;
 /* The transform state for a task view */
 public class TaskViewTransform {
     public int translationY = 0;
+    public int translationZ = 0;
     public float scale = 1f;
     public float alpha = 1f;
     public float dismissAlpha = 1f;
@@ -35,6 +36,7 @@ public class TaskViewTransform {
 
     public TaskViewTransform(TaskViewTransform o) {
         translationY = o.translationY;
+        translationZ = o.translationZ;
         scale = o.scale;
         alpha = o.alpha;
         dismissAlpha = o.dismissAlpha;