Adding support for keyboard based drag and drop

For keyboard DnD, we use Accessible DnD implementation.
A placeholder FloatingView draws the focus indicator
for the virtual views

Test: Visible
Bug: 178781566
Change-Id: I632fc7377dffa1e05e3f0a9c3ad18641deb5a1a4
diff --git a/res/layout/keyboard_drag_and_drop.xml b/res/layout/keyboard_drag_and_drop.xml
new file mode 100644
index 0000000..e9463c4
--- /dev/null
+++ b/res/layout/keyboard_drag_and_drop.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<com.android.launcher3.keyboard.KeyboardDragAndDropView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:focusable="true"
+    android:orientation="vertical"
+    android:elevation="6dp">
+
+    <TextView
+        android:id="@+id/label"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:background="?attr/folderFillColor"
+        android:padding="8dp"
+        android:textColor="?attr/folderTextColor"
+        />
+
+</com.android.launcher3.keyboard.KeyboardDragAndDropView>
\ No newline at end of file
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index cf51f77..eaf7a5f 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -139,6 +139,7 @@
     <dimen name="drag_flingToDeleteMinVelocity">-1500dp</dimen>
 
     <dimen name="spring_loaded_panel_border">1dp</dimen>
+    <dimen name="keyboard_drag_stroke_width">4dp</dimen>
 
 <!-- Folders -->
     <dimen name="page_indicator_dot_size">8dp</dimen>