Add a direct manipulation screen and some widgets.

BUG: 153886988
Test: manual, Danny ran the app
Change-Id: Idd0c128b0c272a9827b1f24e5edf2d97b3fbcf0c

2 files changed, 68 insertions, 9 deletions

diff --git a/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryDirectManipulationWidgets.java b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryDirectManipulationWidgets.java
new file mode 100644
index 0000000..34f9f60
--- /dev/null
+++ b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryDirectManipulationWidgets.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+package com.android.car.rotaryplayground;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+/**
+ * Fragment that demos rotary interactions directly manipulating the state of UI widgets such as a
+ * {@link android.widget.SeekBar}, {@link android.widget.DatePicker}, and
+ * {@link android.widget.RadialTimePickerView}.
+ */
+public class RotaryDirectManipulationWidgets extends Fragment {
+    // TODO(agathaman): refactor a common class that takes in a fragment xml id and inflates it, to
+    //  share between this and RotaryCards.
+    @Override
+    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.rotary_direct_manipulation, container, false);
+    }
+}
diff --git a/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryMenu.java b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryMenu.java
index 29f446d..d54a721 100644
--- a/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryMenu.java
+++ b/RotaryPlayground/src/com/android/car/rotaryplayground/RotaryMenu.java
@@ -32,29 +32,36 @@ public class RotaryMenu extends Fragment {
 
     private Fragment mRotaryCards = null;
     private Fragment mRotaryGrid = null;
+    private Fragment mDirectManipulation = null;
 
-    private Button mCardExamplesButton;
-    private Button mGridExampleButton;
+    private Button mCardButton;
+    private Button mGridButton;
+    private Button mDirectManipulationButton;
 
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
             @Nullable Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.rotary_menu, container, false);
 
-        mCardExamplesButton = view.findViewById(R.id.cards_example);
-        mCardExamplesButton.setOnFocusChangeListener((v, hasFocus) -> showRotaryCards(hasFocus));
-        mCardExamplesButton.setOnClickListener(v -> showRotaryCards(/* hasFocus= */ true));
+        mCardButton = view.findViewById(R.id.cards);
+        mCardButton.setOnFocusChangeListener((v, hasFocus) -> showRotaryCards(hasFocus));
+        mCardButton.setOnClickListener(v -> showRotaryCards(/* hasFocus= */ true));
 
-        mGridExampleButton = view.findViewById(R.id.grid_example);
-        mGridExampleButton.setOnFocusChangeListener((v, hasFocus) -> showGridExample(hasFocus));
-        mGridExampleButton.setOnClickListener(v -> showGridExample(/* hasFocus= */ true));
+        mGridButton = view.findViewById(R.id.grid);
+        mGridButton.setOnFocusChangeListener((v, hasFocus) -> showGridExample(hasFocus));
+        mGridButton.setOnClickListener(v -> showGridExample(/* hasFocus= */ true));
 
+        mDirectManipulationButton = view.findViewById(R.id.direct_manipulation);
+        mDirectManipulationButton.setOnFocusChangeListener(
+                (v, hasFocus) -> showDirectManipulationExamples(hasFocus));
+        mDirectManipulationButton.setOnClickListener(
+                (v -> showDirectManipulationExamples(/* hasFocus= */ true)));
         return view;
     }
 
     private void showRotaryCards(boolean hasFocus) {
         if (!hasFocus) {
-            return; // do nothing if no focus.
+            return; // Do nothing if no focus.
         }
         if (mRotaryCards == null) {
             mRotaryCards = new RotaryCards();
@@ -72,6 +79,18 @@ public class RotaryMenu extends Fragment {
         showContent(mRotaryGrid);
     }
 
+    // TODO(agathaman): refactor this and the showRotaryCards above into a
+    //  showFragment(Fragment fragment, boolean hasFocus); method.
+    private void showDirectManipulationExamples(boolean hasFocus) {
+        if (!hasFocus) {
+            return; // Do nothing if no focus.
+        }
+        if (mDirectManipulation == null) {
+            mDirectManipulation = new RotaryDirectManipulationWidgets();
+        }
+        showContent(mDirectManipulation);
+    }
+
     private void showContent(Fragment fragment) {
         getFragmentManager().beginTransaction()
                 .replace(R.id.rotary_content, fragment)