1 files changed, 87 insertions, 0 deletions
diff --git a/android/support/transition/SyncTransitionListener.java b/android/support/transition/SyncTransitionListener.java
new file mode 100644
index 00000000..4d7e02e8
--- /dev/null
+++ b/android/support/transition/SyncTransitionListener.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2016 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 android.support.transition;
+
+import android.support.annotation.NonNull;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * This {@link Transition.TransitionListener} synchronously waits for the specified callback.
+ */
+class SyncTransitionListener implements Transition.TransitionListener {
+
+    static final int EVENT_START = 1;
+    static final int EVENT_END = 2;
+    static final int EVENT_CANCEL = 3;
+    static final int EVENT_PAUSE = 4;
+    static final int EVENT_RESUME = 5;
+
+    private final int mTargetEvent;
+    private CountDownLatch mLatch = new CountDownLatch(1);
+
+    SyncTransitionListener(int event) {
+        mTargetEvent = event;
+    }
+
+    boolean await() {
+        try {
+            return mLatch.await(3000, TimeUnit.MILLISECONDS);
+        } catch (InterruptedException e) {
+            return false;
+        }
+    }
+
+    void reset() {
+        mLatch = new CountDownLatch(1);
+    }
+
+    @Override
+    public void onTransitionStart(@NonNull Transition transition) {
+        if (mTargetEvent == EVENT_START) {
+            mLatch.countDown();
+        }
+    }
+
+    @Override
+    public void onTransitionEnd(@NonNull Transition transition) {
+        if (mTargetEvent == EVENT_END) {
+            mLatch.countDown();
+        }
+    }
+
+    @Override
+    public void onTransitionCancel(@NonNull Transition transition) {
+        if (mTargetEvent == EVENT_CANCEL) {
+            mLatch.countDown();
+        }
+    }
+
+    @Override
+    public void onTransitionPause(@NonNull Transition transition) {
+        if (mTargetEvent == EVENT_PAUSE) {
+            mLatch.countDown();
+        }
+    }
+
+    @Override
+    public void onTransitionResume(@NonNull Transition transition) {
+        if (mTargetEvent == EVENT_RESUME) {
+            mLatch.countDown();
+        }
+    }
+}