Changed widget picker personal-work tab layout

Used layout margin instead of padding. Also making sure that Talkback would focus on the widgets title once the widget picker is opened.

Before: https://screenshot.googleplex.com/AgZspqTc7yS2Lte
Now: https://screenshot.googleplex.com/5W66ky7XAByCFRZ

Fix: 247121867
Test: Manual
Change-Id: I76534454754c5e57ab51ae7ce06ca4370a3fd22b

res/layout/all_apps_personal_work_tabs.xml

@@ -16,6 +16,7 @@
 
 <com.android.launcher3.workprofile.PersonalWorkSlidingTabStrip
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:launcher="http://schemas.android.com/apk/res-auto"
     android:id="@+id/tabs"
     android:layout_width="match_parent"
     android:layout_height="@dimen/all_apps_header_pill_height"
@@ -24,7 +25,8 @@
     android:paddingBottom="@dimen/all_apps_tabs_vertical_padding"
     android:layout_marginTop="@dimen/all_apps_tabs_margin_top"
     android:orientation="horizontal"
-    style="@style/TextHeadline">
+    style="@style/TextHeadline"
+    launcher:alignOnIcon="true">
 
     <Button
         android:id="@+id/tab_personal"

res/layout/widgets_full_sheet_paged_view.xml

@@ -89,8 +89,7 @@
             android:gravity="center_horizontal"
             android:orientation="horizontal"
             android:paddingVertical="8dp"
-            android:paddingLeft="@dimen/widget_tabs_horizontal_padding"
-            android:paddingRight="@dimen/widget_tabs_horizontal_padding"
+            android:layout_marginHorizontal="@dimen/widget_list_horizontal_margin"
             android:background="?android:attr/colorBackground"
             style="@style/TextHeadline"
             launcher:layout_sticky="true">

res/values/attrs.xml

@@ -214,6 +214,10 @@
         <attr name="c" format="float|dimension" />
     </declare-styleable>
 
+    <declare-styleable name="PersonalWorkSlidingTabStrip">
+        <attr name="alignOnIcon" format="boolean" />
+    </declare-styleable>
+
     <declare-styleable name="ProfileDisplayOption">
         <attr name="name" />
         <attr name="minWidthDps" format="float" />

src/com/android/launcher3/workprofile/PersonalWorkSlidingTabStrip.java

@@ -16,6 +16,7 @@
 package com.android.launcher3.workprofile;
 
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.util.AttributeSet;
 import android.widget.Button;
 import android.widget.LinearLayout;
@@ -24,6 +25,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.R;
 import com.android.launcher3.pageindicators.PageIndicator;
 import com.android.launcher3.views.ActivityContext;
 
@@ -31,11 +33,17 @@ import com.android.launcher3.views.ActivityContext;
  * Supports two indicator colors, dedicated for personal and work tabs.
  */
 public class PersonalWorkSlidingTabStrip extends LinearLayout implements PageIndicator {
+    private final boolean mIsAlignOnIcon;
     private OnActivePageChangedListener mOnActivePageChangedListener;
     private int mLastActivePage = 0;
 
     public PersonalWorkSlidingTabStrip(@NonNull Context context, @Nullable AttributeSet attrs) {
         super(context, attrs);
+        TypedArray typedArray = context.obtainStyledAttributes(attrs,
+                R.styleable.PersonalWorkSlidingTabStrip);
+        mIsAlignOnIcon = typedArray.getBoolean(
+                R.styleable.PersonalWorkSlidingTabStrip_alignOnIcon, false);
+        typedArray.recycle();
     }
 
     /**
@@ -76,7 +84,7 @@ public class PersonalWorkSlidingTabStrip extends LinearLayout implements PageInd
 
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        if (getPaddingLeft() == 0 && getPaddingRight() == 0) {
+        if (mIsAlignOnIcon) {
             // If any padding is not specified, restrict the width to emulate padding
             int size = MeasureSpec.getSize(widthMeasureSpec);
             size = getTabWidth(getContext(), size);