Support DISABLE_NAVIGATION on phones.

Bug: 5161286
Change-Id: I6a2c3053423c2b34136b0c3889f575f9c082d7e9

packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

@@ -57,6 +57,7 @@ public class NavigationBarView extends LinearLayout {
     boolean mVertical;
 
     boolean mHidden;
+    boolean mEnabled = true;
 
     public View getRecentsButton() {
         return mCurrentView.findViewById(R.id.recent_apps);
@@ -81,6 +82,11 @@ public class NavigationBarView extends LinearLayout {
         mVertical = false;
     }
 
+    public void setEnabled(final boolean enable) {
+        mEnabled = enable;
+        mCurrentView.setVisibility(enable ? View.VISIBLE : View.INVISIBLE);
+    }
+
     public void setHidden(final boolean hide) {
         if (hide == mHidden) return;
 

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

@@ -1048,12 +1048,30 @@ public class PhoneStatusBar extends StatusBar {
         final int diff = state ^ old;
         mDisabled = state;
 
+        if (DEBUG) {
+            Slog.d(TAG, String.format("disable: 0x%08x -> 0x%08x (diff: 0x%08x)",
+                old, state, diff));
+        }
+
         if ((diff & StatusBarManager.DISABLE_EXPAND) != 0) {
             if ((state & StatusBarManager.DISABLE_EXPAND) != 0) {
                 Slog.d(TAG, "DISABLE_EXPAND: yes");
                 animateCollapse();
             }
         }
+
+        if ((diff & StatusBarManager.DISABLE_NAVIGATION) != 0) {
+            if ((state & StatusBarManager.DISABLE_NAVIGATION) != 0) {
+                Slog.d(TAG, "DISABLE_NAVIGATION: yes");
+
+                // close recents if it's visible
+                mHandler.removeMessages(MSG_CLOSE_RECENTS_PANEL);
+                mHandler.sendEmptyMessage(MSG_CLOSE_RECENTS_PANEL);
+            }
+
+            mNavigationBarView.setEnabled((state & StatusBarManager.DISABLE_NAVIGATION) == 0);
+        }
+
         if ((diff & StatusBarManager.DISABLE_NOTIFICATION_ICONS) != 0) {
             if ((state & StatusBarManager.DISABLE_NOTIFICATION_ICONS) != 0) {
                 Slog.d(TAG, "DISABLE_NOTIFICATION_ICONS: yes");