Adding util classes copied from SUP

Bug: 34841755
Change-Id: I8d93a032a8cc18f808a3d4c4d8b7b6b80a799c01

3 files changed, 152 insertions, 0 deletions

diff --git a/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/DividerItemDecoration.java b/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/DividerItemDecoration.java
new file mode 100644
index 00000000..7ea10de0
--- /dev/null
+++ b/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/DividerItemDecoration.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * 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.example.android.wearable.wear.messaging.util;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.drawable.Drawable;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+
+/**
+ * Recycler view divider.
+ */
+public class DividerItemDecoration extends RecyclerView.ItemDecoration {
+
+    private Drawable mDrawable;
+
+    public DividerItemDecoration(Context context, int resId) {
+        mDrawable = ContextCompat.getDrawable(context, resId);
+    }
+
+    @Override
+    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
+        int left = parent.getLeft();
+        int right = parent.getRight();
+
+        int childCount = parent.getChildCount();
+
+        for (int i = 0; i < childCount; i++) {
+            View child = parent.getChildAt(i);
+
+            int top = child.getBottom();
+            int bottom = top + mDrawable.getIntrinsicHeight();
+
+            mDrawable.setBounds(left, top, right, bottom);
+            mDrawable.draw(c);
+        }
+    }
+}
diff --git a/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/MenuTinter.java b/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/MenuTinter.java
new file mode 100644
index 00000000..bad1df3a
--- /dev/null
+++ b/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/MenuTinter.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * 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.example.android.wearable.wear.messaging.util;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.support.v4.content.ContextCompat;
+import android.support.v4.graphics.drawable.DrawableCompat;
+import android.view.Menu;
+import android.view.MenuItem;
+
+/**
+ * Helper method to tint menu item icons.
+ */
+public class MenuTinter {
+    private MenuTinter() {}
+
+    /**
+     * Tints the menu icons
+     *
+     * @param context resource context
+     * @param menu menu to tint
+     * @param refColor color to tint
+     */
+    public static void tintMenu(Context context, Menu menu, int refColor) {
+        for (int i = 0; i < menu.size(); i++) {
+            MenuItem item = menu.getItem(i);
+            Drawable drawable = item.getIcon();
+            if (drawable != null) {
+                drawable = DrawableCompat.wrap(drawable);
+                drawable.mutate();
+                DrawableCompat.setTint(drawable, ContextCompat.getColor(context, refColor));
+                item.setIcon(drawable);
+            }
+        }
+    }
+}
diff --git a/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/PrescrollToBottom.java b/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/PrescrollToBottom.java
new file mode 100644
index 00000000..3b98c5bc
--- /dev/null
+++ b/wearable/wear/WearMessagingApp/Wearable/src/main/java/com/example/android/wearable/wear/messaging/util/PrescrollToBottom.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * 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.example.android.wearable.wear.messaging.util;
+
+import android.support.v7.widget.RecyclerView;
+import android.util.Log;
+import android.view.ViewTreeObserver;
+
+/**
+ * Prescrolls to the last element in the adapter before draw and removes itself.
+ */
+public class PrescrollToBottom implements ViewTreeObserver.OnPreDrawListener {
+
+    private static final String TAG = "PrescrollToBottom";
+
+    private RecyclerView mRecyclerView;
+    private RecyclerView.Adapter mAdapter;
+
+    public PrescrollToBottom(RecyclerView recyclerView, RecyclerView.Adapter adapter) {
+        mRecyclerView = recyclerView;
+        mAdapter = adapter;
+    }
+
+    @Override
+    public boolean onPreDraw() {
+        boolean shouldScroll = mAdapter.getItemCount() > 2;
+        if (shouldScroll) {
+            Log.d(TAG, "Smooth scrolling after draw to position " + mAdapter.getItemCount());
+            mRecyclerView.smoothScrollToPosition(mAdapter.getItemCount());
+        }
+        // always remove the listener so that we do not get multiple
+        // instances of it attached when it is not needed
+        mRecyclerView.getViewTreeObserver().removeOnPreDrawListener(this);
+        return !shouldScroll;
+    }
+}
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