1 files changed, 74 insertions, 0 deletions
diff --git a/java/com/android/bubble/WindowRoot.java b/java/com/android/bubble/WindowRoot.java
new file mode 100644
index 000000000..b9024c413
--- /dev/null
+++ b/java/com/android/bubble/WindowRoot.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2017 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.bubble;
+
+import android.content.Context;
+import android.content.res.Configuration;
+import android.support.annotation.NonNull;
+import android.view.KeyEvent;
+import android.widget.FrameLayout;
+
+/**
+ * ViewGroup that handles some overlay window concerns. Allows back button and configuration change
+ * events to be listened for via interfaces.
+ */
+public class WindowRoot extends FrameLayout {
+
+  /** Callback for when the back button is pressed while this window is in focus */
+  public interface OnBackPressedListener {
+    boolean onBackPressed();
+  }
+
+  /** Callback for when the Configuration changes for this window */
+  public interface OnConfigurationChangedListener {
+    void onConfigurationChanged(Configuration newConfiguration);
+  }
+
+  private OnBackPressedListener backPressedListener;
+  private OnConfigurationChangedListener configurationChangedListener;
+
+  public WindowRoot(@NonNull Context context) {
+    super(context);
+  }
+
+  public void setOnBackPressedListener(OnBackPressedListener listener) {
+    backPressedListener = listener;
+  }
+
+  public void setOnConfigurationChangedListener(OnConfigurationChangedListener listener) {
+    configurationChangedListener = listener;
+  }
+
+  @Override
+  public boolean dispatchKeyEvent(KeyEvent event) {
+    if (event.getKeyCode() == KeyEvent.KEYCODE_BACK && backPressedListener != null) {
+      if (event.getAction() == KeyEvent.ACTION_UP) {
+        return backPressedListener.onBackPressed();
+      }
+      return true;
+    }
+    return super.dispatchKeyEvent(event);
+  }
+
+  @Override
+  public void dispatchConfigurationChanged(Configuration newConfig) {
+    super.dispatchConfigurationChanged(newConfig);
+    if (configurationChangedListener != null) {
+      configurationChangedListener.onConfigurationChanged(newConfig);
+    }
+  }
+}