From e759cd58bda6652e5413e7ca2a39b77bb776a610 Mon Sep 17 00:00:00 2001
From: Winson <winsonc@google.com>
Date: Thu, 3 Dec 2015 16:55:06 -0800
Subject: [PATCH] Add tuner params to change the initial stack state and navbar
 gesture.

Change-Id: I114b8342f5293589eb96a1fd3a14da1757e75a95
---
 packages/SystemUI/res/values/strings.xml      | 12 +++++++++-
 packages/SystemUI/res/xml/tuner_prefs.xml     | 10 +++++++++
 .../systemui/recents/RecentsDebugFlags.java   | 15 ++++++++++++-
 .../views/TaskStackLayoutAlgorithm.java       |  3 ++-
 .../phone/NavigationBarGestureHelper.java     | 22 +++++++++++++------
 5 files changed, 52 insertions(+), 10 deletions(-)

diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index d6a361c2be710..002b9f504e52f 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -1171,13 +1171,23 @@
     <!-- Toggles fullscreen screenshots. DO NOT TRANSLATE -->
     <string name="overview_fullscreen_thumbnails">Enable fullscreen screenshots</string>
     <!-- Description for the toggle for fullscreen screenshots. DO NOT TRANSLATE -->
-    <string name="overview_fullscreen_thumbnails_desc">Enable fullscreen screenshots in Overview</string>
+    <string name="overview_fullscreen_thumbnails_desc">Enable fullscreen screenshots in Overview. Restart required.</string>
+
+    <!-- Toggle to enable the Overview nav bar gesture. DO NOT TRANSLATE -->
+    <string name="overview_nav_bar_gesture">Enable navigation bar gesture</string>
+    <!-- Description for the toggle to enable the Overview nav bar gesture. DO NOT TRANSLATE -->
+    <string name="overview_nav_bar_gesture_desc">Enables the gesture to enter Overview by swiping up on the Nav bar</string>
 
     <!-- Toggle to show the history view in Overview. DO NOT TRANSLATE -->
     <string name="overview_show_history">Show History</string>
     <!-- Description for the toggle to show the history view in Overview. DO NOT TRANSLATE -->
     <string name="overview_show_history_desc">Enables the history view to see more recent tasks</string>
 
+    <!-- Toggle to set the initial scroll state to be paging or stack. DO NOT TRANSLATE -->
+    <string name="overview_initial_state_paging">Initialize to paging</string>
+    <!-- Description for the toggle to set the initial scroll state to be paging or stack. DO NOT TRANSLATE -->
+    <string name="overview_initial_state_paging_desc">Determines whether Overview will initially be in a stacked or paged state</string>
+
     <!-- Category in the System UI Tuner settings, where new/experimental
          settings are -->
     <string name="experimental">Experimental</string>
diff --git a/packages/SystemUI/res/xml/tuner_prefs.xml b/packages/SystemUI/res/xml/tuner_prefs.xml
index f398af3d04c99..8dcf8a7bc60fe 100644
--- a/packages/SystemUI/res/xml/tuner_prefs.xml
+++ b/packages/SystemUI/res/xml/tuner_prefs.xml
@@ -92,11 +92,21 @@
             android:title="@string/overview_page_on_toggle"
             android:summary="@string/overview_page_on_toggle_desc" />
 
+        <com.android.systemui.tuner.TunerSwitch
+            android:key="overview_initial_state_paging"
+            android:title="@string/overview_initial_state_paging"
+            android:summary="@string/overview_initial_state_paging_desc" />
+
         <com.android.systemui.tuner.TunerSwitch
             android:key="overview_fast_toggle"
             android:title="@string/overview_fast_toggle_via_button"
             android:summary="@string/overview_fast_toggle_via_button_desc" />
 
+        <com.android.systemui.tuner.TunerSwitch
+            android:key="overview_nav_bar_gesture"
+            android:title="@string/overview_nav_bar_gesture"
+            android:summary="@string/overview_nav_bar_gesture_desc" />
+
         <com.android.systemui.tuner.TunerSwitch
             android:key="overview_fullscreen_thumbnails"
             android:title="@string/overview_fullscreen_thumbnails"
diff --git a/packages/SystemUI/src/com/android/systemui/recents/RecentsDebugFlags.java b/packages/SystemUI/src/com/android/systemui/recents/RecentsDebugFlags.java
index e8b88165721c0..d778886721e7f 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/RecentsDebugFlags.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/RecentsDebugFlags.java
@@ -30,6 +30,7 @@ public class RecentsDebugFlags implements TunerService.Tunable {
     private static final String KEY_PAGE_ON_TOGGLE = "overview_page_on_toggle";
     private static final String KEY_FULLSCREEN_THUMBNAILS = "overview_fullscreen_thumbnails";
     private static final String KEY_SHOW_HISTORY = "overview_show_history";
+    private static final String KEY_INITIAL_STATE_PAGING = "overview_initial_state_paging";
 
     public static class Static {
         // Enables debug drawing for the transition thumbnail
@@ -54,6 +55,7 @@ public class RecentsDebugFlags implements TunerService.Tunable {
     private boolean mPageOnToggle;
     private boolean mUseFullscreenThumbnails;
     private boolean mShowHistory;
+    private boolean mInitialStatePaging;
 
     /**
      * We read the prefs once when we start the activity, then update them as the tuner changes
@@ -63,7 +65,7 @@ public class RecentsDebugFlags implements TunerService.Tunable {
         // Register all our flags, this will also call onTuningChanged() for each key, which will
         // initialize the current state of each flag
         TunerService.get(context).addTunable(this, KEY_FAST_TOGGLE, KEY_PAGE_ON_TOGGLE,
-                KEY_FULLSCREEN_THUMBNAILS, KEY_SHOW_HISTORY);
+                KEY_FULLSCREEN_THUMBNAILS, KEY_SHOW_HISTORY, KEY_INITIAL_STATE_PAGING);
     }
 
     /**
@@ -94,6 +96,13 @@ public class RecentsDebugFlags implements TunerService.Tunable {
         return mShowHistory;
     }
 
+    /**
+     * @return whether the initial stack state is paging.
+     */
+    public boolean isInitialStatePaging() {
+        return mInitialStatePaging;
+    }
+
     @Override
     public void onTuningChanged(String key, String newValue) {
         switch (key) {
@@ -113,6 +122,10 @@ public class RecentsDebugFlags implements TunerService.Tunable {
                 mShowHistory = (newValue != null) &&
                         (Integer.parseInt(newValue) != 0);
                 break;
+            case KEY_INITIAL_STATE_PAGING:
+                mInitialStatePaging = (newValue != null) &&
+                        (Integer.parseInt(newValue) != 0);
+                break;
         }
         EventBus.getDefault().send(new DebugFlagsChangedEvent());
     }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackLayoutAlgorithm.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackLayoutAlgorithm.java
index d630032f092d3..ebb819c1372e5 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackLayoutAlgorithm.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackLayoutAlgorithm.java
@@ -498,7 +498,8 @@ public class TaskStackLayoutAlgorithm {
     public float getDefaultFocusState() {
         RecentsActivityLaunchState launchState = Recents.getConfiguration().getLaunchState();
         RecentsDebugFlags debugFlags = Recents.getDebugFlags();
-        if (debugFlags.isPageOnToggleEnabled() || launchState.launchedWithAltTab) {
+        if (launchState.launchedWithAltTab ||
+                (debugFlags.isPageOnToggleEnabled() && debugFlags.isInitialStatePaging())) {
             return 1f;
         }
         return 0f;
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarGestureHelper.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarGestureHelper.java
index b4e0692f42580..a2616fe46efb5 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarGestureHelper.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarGestureHelper.java
@@ -18,29 +18,27 @@ package com.android.systemui.statusbar.phone;
 
 import android.app.ActivityManager;
 import android.content.Context;
-import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Rect;
-import android.os.SystemProperties;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.VelocityTracker;
 import android.view.ViewConfiguration;
-import android.view.WindowManager;
 
 import com.android.systemui.R;
 import com.android.systemui.RecentsComponent;
 import com.android.systemui.stackdivider.Divider;
-import com.android.systemui.statusbar.BaseStatusBar;
+import com.android.systemui.tuner.TunerService;
 
 import static android.view.WindowManager.*;
 
 /**
  * Class to detect gestures on the navigation bar.
  */
-public class NavigationBarGestureHelper extends GestureDetector.SimpleOnGestureListener {
+public class NavigationBarGestureHelper extends GestureDetector.SimpleOnGestureListener
+        implements TunerService.Tunable {
 
-    private static final String DOCK_WINDOW_GESTURE_ENABLED_PROP = "persist.dock_gesture_enabled";
+    private static final String KEY_DOCK_WINDOW_GESTURE = "overview_nav_bar_gesture";
 
     /**
      * When dragging from the navigation bar, we drag in recents.
@@ -78,7 +76,7 @@ public class NavigationBarGestureHelper extends GestureDetector.SimpleOnGestureL
         mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
         mMinFlingVelocity = configuration.getScaledMinimumFlingVelocity();
         mTaskSwitcherDetector = new GestureDetector(context, this);
-        mDockWindowEnabled = SystemProperties.getBoolean(DOCK_WINDOW_GESTURE_ENABLED_PROP, false);
+        TunerService.get(context).addTunable(this, KEY_DOCK_WINDOW_GESTURE);
     }
 
     public void setComponents(RecentsComponent recentsComponent, Divider divider) {
@@ -267,4 +265,14 @@ public class NavigationBarGestureHelper extends GestureDetector.SimpleOnGestureL
         }
         return true;
     }
+
+    @Override
+    public void onTuningChanged(String key, String newValue) {
+        switch (key) {
+            case KEY_DOCK_WINDOW_GESTURE:
+                mDockWindowEnabled = (newValue != null) &&
+                        (Integer.parseInt(newValue) != 0);
+                break;
+        }
+    }
 }