From e8a7568bbdbe58d1528fafdf93c79c78487fd7de Mon Sep 17 00:00:00 2001
From: Brad Stenning <stenning@google.com>
Date: Wed, 17 Jan 2018 10:02:21 -0800
Subject: Fix NPE when registering gesture support

Car implementation does no support gestures thus this installs a null
object pattern version of the gesture plug in.
This is a temp solution while the class hierarchy is being refactored.

Bug: 72094006

Test: deploy and check
Change-Id: I7cbca3d77546d62e3e78d8c73faa8ef5cd8803f0
---
 .../statusbar/car/CarNavigationBarView.java        | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/car/CarNavigationBarView.java b/packages/SystemUI/src/com/android/systemui/statusbar/car/CarNavigationBarView.java
index 6cbbd6cd1f18..e5a311d099d5 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/car/CarNavigationBarView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/car/CarNavigationBarView.java
@@ -17,11 +17,15 @@
 package com.android.systemui.statusbar.car;
 
 import android.content.Context;
+import android.graphics.Canvas;
 import android.util.AttributeSet;
+import android.view.MotionEvent;
 import android.view.View;
 import android.widget.LinearLayout;
 
 import com.android.systemui.R;
+import com.android.systemui.plugins.statusbar.phone.NavGesture;
+import com.android.systemui.statusbar.phone.NavigationBarGestureHelper;
 import com.android.systemui.statusbar.phone.NavigationBarView;
 
 /**
@@ -72,4 +76,68 @@ class CarNavigationBarView extends NavigationBarView {
         // Calling setNavigationIconHints in the base class will result in a NPE as the car
         // navigation bar does not have a back button.
     }
+
+    @Override
+    public void onPluginConnected(NavGesture plugin, Context context) {
+        // set to null version of the plugin ignoring incoming arg.
+        super.onPluginConnected(new NullNavGesture(), context);
+    }
+
+    @Override
+    public void onPluginDisconnected(NavGesture plugin) {
+        // reinstall the null nav gesture plugin
+        super.onPluginConnected(new NullNavGesture(), getContext());
+    }
+
+    /**
+     * Null object pattern to work around expectations of the base class.
+     * This is a temporary solution to have the car system ui working.
+     * Already underway is a refactor of they car sys ui as to not use this class
+     * hierarchy.
+     */
+    private static class NullNavGesture implements NavGesture {
+        @Override
+        public GestureHelper getGestureHelper() {
+            return new GestureHelper() {
+                @Override
+                public boolean onTouchEvent(MotionEvent event) {
+                    return false;
+                }
+
+                @Override
+                public boolean onInterceptTouchEvent(MotionEvent event) {
+                    return false;
+                }
+
+                @Override
+                public void setBarState(boolean vertical, boolean isRtl) {
+                }
+
+                @Override
+                public void onDraw(Canvas canvas) {
+                }
+
+                @Override
+                public void onDarkIntensityChange(float intensity) {
+                }
+
+                @Override
+                public void onLayout(boolean changed, int left, int top, int right, int bottom) {
+                }
+            };
+        }
+
+        @Override
+        public int getVersion() {
+            return 0;
+        }
+
+        @Override
+        public void onCreate(Context sysuiContext, Context pluginContext) {
+        }
+
+        @Override
+        public void onDestroy() {
+        }
+    }
 }
-- 
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