Add user selection to car status bar and animate.

Adds the UserGridView to the car status bar and adds an animation when
expanding/hiding.

Bug: 63593747
Tested on Mojave with the fullscreen user switcher and status bar.

Change-Id: If6ddbd4da896c5eb661393dcc35ab299361754e9

5 files changed, 143 insertions, 13 deletions

diff --git a/packages/SystemUI/res/layout/car_qs_panel.xml b/packages/SystemUI/res/layout/car_qs_panel.xml
index d1f7ff83db93..0b46b0bdaa1c 100644
--- a/packages/SystemUI/res/layout/car_qs_panel.xml
+++ b/packages/SystemUI/res/layout/car_qs_panel.xml
@@ -24,4 +24,11 @@
 
     <include layout="@layout/car_status_bar_header" />
     <include layout="@layout/car_qs_footer" />
+
+    <com.android.systemui.statusbar.car.UserGridView
+        android:id="@+id/user_grid"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="@dimen/car_margin"
+        android:layout_marginRight="@dimen/car_margin" />
 </LinearLayout>
diff --git a/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFooter.java b/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFooter.java
index 9730f29da977..d42b87bcef28 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFooter.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFooter.java
@@ -18,6 +18,7 @@ import android.content.Intent;
 import android.graphics.drawable.Drawable;
 import android.support.annotation.Nullable;
 import android.util.AttributeSet;
+import android.util.Log;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.RelativeLayout;
@@ -27,6 +28,7 @@ import com.android.systemui.R;
 import com.android.systemui.plugins.ActivityStarter;
 import com.android.systemui.qs.QSFooter;
 import com.android.systemui.qs.QSPanel;
+import com.android.systemui.statusbar.car.UserGridView;
 import com.android.systemui.statusbar.phone.MultiUserSwitch;
 import com.android.systemui.statusbar.policy.DeviceProvisionedController;
 import com.android.systemui.statusbar.policy.UserInfoController;
@@ -37,10 +39,13 @@ import com.android.systemui.statusbar.policy.UserInfoController;
  */
 public class CarQSFooter extends RelativeLayout implements QSFooter,
         UserInfoController.OnUserInfoChangedListener {
+    private static final String TAG = "CarQSFooter";
+
     private UserInfoController mUserInfoController;
 
     private MultiUserSwitch mMultiUserSwitch;
     private ImageView mMultiUserAvatar;
+    private UserGridView mUserGridView;
 
     public CarQSFooter(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -54,6 +59,19 @@ public class CarQSFooter extends RelativeLayout implements QSFooter,
 
         mUserInfoController = Dependency.get(UserInfoController.class);
 
+        mMultiUserSwitch.setOnClickListener(v -> {
+            if (mUserGridView == null) {
+                Log.e(TAG, "CarQSFooter not properly set up; cannot display user switcher.");
+                return;
+            }
+
+            if (!mUserGridView.isShowing()) {
+                mUserGridView.show();
+            } else {
+                mUserGridView.hide();
+            }
+        });
+
         findViewById(R.id.settings_button).setOnClickListener(v -> {
             ActivityStarter activityStarter = Dependency.get(ActivityStarter.class);
 
@@ -80,6 +98,10 @@ public class CarQSFooter extends RelativeLayout implements QSFooter,
         }
     }
 
+    public void setUserGridView(UserGridView view) {
+        mUserGridView = view;
+    }
+
     @Override
     public void setListening(boolean listening) {
         if (listening) {
diff --git a/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFragment.java b/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFragment.java
index 7c2a8129813a..13298d378845 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFragment.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/car/CarQSFragment.java
@@ -22,9 +22,12 @@ import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 
+import com.android.systemui.Dependency;
 import com.android.systemui.R;
 import com.android.systemui.plugins.qs.QS;
 import com.android.systemui.qs.QSFooter;
+import com.android.systemui.statusbar.car.UserGridView;
+import com.android.systemui.statusbar.policy.UserSwitcherController;
 
 /**
  * A quick settings fragment for the car. For auto, there is no row for quick settings or ability
@@ -33,7 +36,8 @@ import com.android.systemui.qs.QSFooter;
  */
 public class CarQSFragment extends Fragment implements QS {
     private View mHeader;
-    private QSFooter mFooter;
+    private CarQSFooter mFooter;
+    private UserGridView mUserGridView;
 
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@@ -46,6 +50,12 @@ public class CarQSFragment extends Fragment implements QS {
         super.onViewCreated(view, savedInstanceState);
         mHeader = view.findViewById(R.id.header);
         mFooter = view.findViewById(R.id.qs_footer);
+
+        mUserGridView = view.findViewById(R.id.user_grid);
+        mUserGridView.init(null, Dependency.get(UserSwitcherController.class),
+                false /* showInitially */);
+
+        mFooter.setUserGridView(mUserGridView);
     }
 
     @Override
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java b/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java
index 6060134de6da..172c62a99db2 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/car/FullscreenUserSwitcher.java
@@ -53,7 +53,7 @@ public class FullscreenUserSwitcher {
         mParent = containerStub.inflate();
         mContainer = mParent.findViewById(R.id.container);
         mUserGridView = mContainer.findViewById(R.id.user_grid);
-        mUserGridView.init(statusBar, mUserSwitcherController);
+        mUserGridView.init(statusBar, mUserSwitcherController, true /* showInitially */);
         mUserGridView.setUserSelectionListener(record -> {
             if (!record.isCurrent) {
                 toggleSwitchInProgress(true);
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridView.java b/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridView.java
index f178aa634247..e551801ca434 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridView.java
@@ -16,20 +16,21 @@
 
 package com.android.systemui.statusbar.car;
 
+import android.animation.Animator;
+import android.animation.Animator.AnimatorListener;
+import android.animation.ValueAnimator;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
-import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Paint.Align;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.GradientDrawable;
-import android.os.UserHandle;
 import android.support.v4.view.PagerAdapter;
 import android.support.v4.view.ViewPager;
+import android.support.v4.view.animation.FastOutSlowInInterpolator;
 import android.util.AttributeSet;
-import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -37,9 +38,7 @@ import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
-import com.android.internal.util.UserIcons;
 import com.android.systemui.R;
-import com.android.systemui.statusbar.UserUtil;
 import com.android.systemui.statusbar.phone.StatusBar;
 import com.android.systemui.statusbar.policy.UserSwitcherController;
 
@@ -48,21 +47,44 @@ import com.android.systemui.statusbar.policy.UserSwitcherController;
  * One of the uses of this is for the lock screen in auto.
  */
 public class UserGridView extends ViewPager {
+    private static final int EXPAND_ANIMATION_TIME_MS = 200;
+    private static final int HIDE_ANIMATION_TIME_MS = 133;
+
     private StatusBar mStatusBar;
     private UserSwitcherController mUserSwitcherController;
     private Adapter mAdapter;
     private UserSelectionListener mUserSelectionListener;
+    private ValueAnimator mHeightAnimator;
+    private int mTargetHeight;
+    private int mHeightChildren;
+    private boolean mShowing;
 
     public UserGridView(Context context, AttributeSet attrs) {
         super(context, attrs);
     }
 
-    public void init(StatusBar statusBar, UserSwitcherController userSwitcherController) {
+    public void init(StatusBar statusBar, UserSwitcherController userSwitcherController,
+            boolean showInitially) {
         mStatusBar = statusBar;
         mUserSwitcherController = userSwitcherController;
         mAdapter = new Adapter(mUserSwitcherController);
         addOnLayoutChangeListener(mAdapter);
         setAdapter(mAdapter);
+        mShowing = showInitially;
+    }
+
+    public boolean isShowing() {
+        return mShowing;
+    }
+
+    public void show() {
+        mShowing = true;
+        animateHeightChange(getMeasuredHeight(), mHeightChildren);
+    }
+
+    public void hide() {
+        mShowing = false;
+        animateHeightChange(getMeasuredHeight(), 0);
     }
 
     public void onUserSwitched(int newUserId) {
@@ -83,16 +105,85 @@ public class UserGridView extends ViewPager {
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         // Wrap content doesn't work in ViewPagers, so simulate the behavior in code.
         int height = 0;
-        for(int i = 0; i < getChildCount(); i++) {
-            View child = getChildAt(i);
-            child.measure(widthMeasureSpec,
-                    MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
-            height = Math.max(child.getMeasuredHeight(), height);
+        if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.EXACTLY) {
+            height = MeasureSpec.getSize(heightMeasureSpec);
+        } else {
+            for (int i = 0; i < getChildCount(); i++) {
+                View child = getChildAt(i);
+                child.measure(widthMeasureSpec,
+                        MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
+                height = Math.max(child.getMeasuredHeight(), height);
+            }
+
+            mHeightChildren = height;
+
+            // Override the height if it's not showing.
+            if (!mShowing) {
+                height = 0;
+            }
+
+            // Respect the AT_MOST request from parent.
+            if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
+                height = Math.min(MeasureSpec.getSize(heightMeasureSpec), height);
+            }
         }
         heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
+
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
 
+    private void animateHeightChange(int oldHeight, int newHeight) {
+        // If there is no change in height or an animation is already in progress towards the
+        // desired height, then there's no need to make any changes.
+        if (oldHeight == newHeight || newHeight == mTargetHeight) {
+            return;
+        }
+
+        // Animation in progress is not going towards the new target, so cancel it.
+        if (mHeightAnimator != null){
+            mHeightAnimator.cancel();
+        }
+
+        mTargetHeight = newHeight;
+        mHeightAnimator = ValueAnimator.ofInt(oldHeight, mTargetHeight);
+        mHeightAnimator.addUpdateListener(valueAnimator -> {
+            ViewGroup.LayoutParams layoutParams = getLayoutParams();
+            layoutParams.height = (Integer) valueAnimator.getAnimatedValue();
+            requestLayout();
+        });
+        mHeightAnimator.addListener(new AnimatorListener() {
+            @Override
+            public void onAnimationStart(Animator animator) {}
+
+            @Override
+            public void onAnimationEnd(Animator animator) {
+                // ValueAnimator does not guarantee that the update listener will get an update
+                // to the final value, so here, the final value is set.  Though the final calculated
+                // height (mTargetHeight) could be set, WRAP_CONTENT is more appropriate.
+                ViewGroup.LayoutParams layoutParams = getLayoutParams();
+                layoutParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
+                requestLayout();
+                mHeightAnimator = null;
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animator) {}
+
+            @Override
+            public void onAnimationRepeat(Animator animator) {}
+        });
+
+        mHeightAnimator.setInterpolator(new FastOutSlowInInterpolator());
+        if (oldHeight < newHeight) {
+            // Expanding
+            mHeightAnimator.setDuration(EXPAND_ANIMATION_TIME_MS);
+        } else {
+            // Hiding
+            mHeightAnimator.setDuration(HIDE_ANIMATION_TIME_MS);
+        }
+        mHeightAnimator.start();
+    }
+
     /**
      * This is a ViewPager.PagerAdapter which deletegates the work to a
      * UserSwitcherController.BaseUserAdapter. Java doesn't support multiple inheritance so we have