Refresh tablet notification drawer.

  * New "X" button appears in the system bar, allowing the
    user to clear all notifications. Only appears when the
    notifications list is showing and there are clearable
    items. (Note: the textual button on phones has also been
    replaced with an X.)

  * Updated panel background artwork and positioning.

  * Removed a bunch of old art.

Bug: 4970588
Bug: 4974043
Bug: 3509407 (regression)

Change-Id: Ibadb638cd18c4faa751cd1f311d73ceda65cb3ca
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index 4239d24..18026f1 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -141,7 +141,7 @@
     View mExpandedContents;
     // top bar
     TextView mNoNotificationsTitle;
-    TextView mClearButton;
+    View mClearButton;
     // drag bar
     CloseDragHandle mCloseView;
     
@@ -301,7 +301,7 @@
         mExpandedContents = expanded.findViewById(R.id.notificationLinearLayout);
         mPile = (ViewGroup)expanded.findViewById(R.id.latestItems);
         mNoNotificationsTitle = (TextView)expanded.findViewById(R.id.noNotificationsTitle);
-        mClearButton = (TextView)expanded.findViewById(R.id.clear_all_button);
+        mClearButton = expanded.findViewById(R.id.clear_all_button);
         mClearButton.setOnClickListener(mClearButtonListener);
         mScrollView = (ScrollView)expanded.findViewById(R.id.scroll);
         mNotificationLinearLayout = expanded.findViewById(R.id.notificationLinearLayout);
@@ -1984,7 +1984,9 @@
         final Context context = mContext;
         final Resources res = context.getResources();
 
-        mClearButton.setText(context.getText(R.string.status_bar_clear_all_button));
+        if (mClearButton instanceof TextView) {
+            ((TextView)mClearButton).setText(context.getText(R.string.status_bar_clear_all_button));
+        }
         mNoNotificationsTitle.setText(context.getText(R.string.status_bar_no_notifications_title));
 
         loadDimens();
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/tablet/NotificationPanel.java b/packages/SystemUI/src/com/android/systemui/statusbar/tablet/NotificationPanel.java
index a316e4b..74dbfef 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/tablet/NotificationPanel.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/tablet/NotificationPanel.java
@@ -49,6 +49,7 @@
     Rect mContentArea = new Rect();
     View mSettingsView;
     ViewGroup mContentParent;
+    TabletStatusBar mBar;
 
     // amount to slide mContentParent down by when mContentFrame is missing
     float mContentFrameMissingTranslation;
@@ -63,6 +64,10 @@
         super(context, attrs, defStyle);
     }
 
+    public void setBar(TabletStatusBar b) {
+        mBar = b;
+    }
+
     @Override
     public void onFinishInflate() {
         super.onFinishInflate();
@@ -202,15 +207,16 @@
               ;
 
         set.setDuration(200);
-        if (!showing) {
-            set.addListener(new AnimatorListenerAdapter() {
-                @Override
-                public void onAnimationEnd(Animator _a) {
+        set.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator _a) {
+                if (!showing) {
                     mContentFrame.setVisibility(View.GONE);
                     mContentFrame.setAlpha(1f);
                 }
-            });
-        }
+                updateClearButton();
+            }
+        });
         set.start();
     }
 
@@ -247,12 +253,23 @@
                         removeSettingsView();
                     }
                 }
+                updateClearButton();
                 updatePanelModeButtons();
             }
         });
         a.start();
     }
  
+    public void updateClearButton() {
+        if (mBar != null) {
+            final boolean showX 
+                = (isShowing()
+                        && mNotificationScroller.getVisibility() == View.VISIBLE 
+                        && mNotificationCount > 0);
+            mBar.getClearButton().setVisibility(showX ? View.VISIBLE : View.INVISIBLE);
+        }
+    }
+
     public void updatePanelModeButtons() {
         final boolean settingsVisible = (mSettingsView != null);
         mSettingsButton.setVisibility(!settingsVisible ? View.VISIBLE : View.INVISIBLE);
@@ -294,11 +311,11 @@
         AnimatorSet mContentAnim;
 
         // should group this into a multi-property animation
-        final static int OPEN_DURATION = 136;
-        final static int CLOSE_DURATION = 250;
+        final static int OPEN_DURATION = 300;
+        final static int CLOSE_DURATION = 300;
 
         // the panel will start to appear this many px from the end
-        final int HYPERSPACE_OFFRAMP = 100;
+        final int HYPERSPACE_OFFRAMP = 200;
 
         Choreographer() {
         }
@@ -306,10 +323,6 @@
         void createAnimation(boolean appearing) {
             // mVisible: previous state; appearing: new state
             
-            View root = findViewById(R.id.panel_root);
-            Animator bgAnim = ObjectAnimator.ofInt(root.getBackground(), "alpha",
-                    mVisible ? 255 : 0, appearing ? 255 : 0);
-
             float start, end;
 
             // 0: on-screen
@@ -347,7 +360,6 @@
             mContentAnim = new AnimatorSet();
             mContentAnim
                 .play(fadeAnim)
-                .with(bgAnim)
                 .with(posAnim)
                 ;
             mContentAnim.setDuration((DEBUG?10:1)*(appearing ? OPEN_DURATION : CLOSE_DURATION));
@@ -363,6 +375,9 @@
             mContentAnim.start();
 
             mVisible = appearing;
+
+            // we want to start disappearing promptly
+            if (!mVisible) updateClearButton();
         }
 
         public void onAnimationCancel(Animator animation) {
@@ -376,6 +391,9 @@
             }
             mContentParent.setLayerType(View.LAYER_TYPE_NONE, null);
             mContentAnim = null;
+
+            // we want to show the X lazily
+            if (mVisible) updateClearButton();
         }
 
         public void onAnimationRepeat(Animator animation) {
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java
index c6e546e..dc7e3137 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java
@@ -122,6 +122,7 @@
     View mNotificationTrigger;
     NotificationIconArea mNotificationIconArea;
     ViewGroup mNavigationArea;
+    View mClearButton;
 
     boolean mNotificationDNDMode;
     NotificationData.Entry mNotificationDNDDummyEntry;
@@ -187,6 +188,7 @@
         // Notification Panel
         mNotificationPanel = (NotificationPanel)View.inflate(context,
                 R.layout.status_bar_notification_panel, null);
+        mNotificationPanel.setBar(this);
         mNotificationPanel.show(false, false);
         mNotificationPanel.setOnTouchListener(
                 new TouchOutsideListener(MSG_CLOSE_NOTIFICATION_PANEL, mNotificationPanel));
@@ -451,6 +453,10 @@
         // the more notifications icon
         mNotificationIconArea = (NotificationIconArea)sb.findViewById(R.id.notificationIcons);
 
+        // the "X" that appears in place of the clock when the panel is showing notifications
+        mClearButton = sb.findViewById(R.id.clear_all_button);
+        mClearButton.setOnClickListener(mClearButtonListener);
+
         // where the icons go
         mIconLayout = (NotificationIconArea.IconLayout) sb.findViewById(R.id.icons);
         mIconLayout.setOnTouchListener(new NotificationIconTouchListener());
@@ -581,6 +587,21 @@
         return sb;
     }
 
+    private View.OnClickListener mClearButtonListener = new View.OnClickListener() {
+        public void onClick(View v) {
+            try {
+                mBarService.onClearAllNotifications();
+            } catch (RemoteException ex) {
+                // system process is dead if we're here.
+            }
+            animateCollapse();
+        }
+    };
+
+    public View getClearButton() {
+        return mClearButton;
+    }
+
     public int getStatusBarHeight() {
         return mHeightReceiver.getHeight();
     }
@@ -1183,7 +1204,6 @@
     }
 
     private void setAreThereNotifications() {
-        final boolean hasClearable = mNotificationData.hasClearableItems();
     }
 
     /**