[Chromoting] Add InputInjector and InputInjectorWrapper for easy unittesting

remoting/android/javatests/src/org/chromium/chromoting/TouchEventBuilder.java

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chromoting;
+
+import org.chromium.chromoting.jni.TouchEventData;
+
+import java.util.ArrayList;
+
+/** A helper class to build a {@link TouchEvent}. */

[Lambros, 2016/06/17 23:00:10]

{@link MockInputInjector.TouchEvent}

This builder is a top-level class, which is perhaps
another reason for making TouchEvent a top-level
class as well?

[Hzj_jie, 2016/06/19 23:41:40]

This is also a headache to me. TouchEvent equals to MouseEvent / WheelEvent /
KeyEvent and TextEvent, so it looks weird if we move only TouchEvent into a
top-level class. But other events are also too trivial to deserve a top-level
class.

+public final class TouchEventBuilder {
+    private final ArrayList<TouchEventData> mData;
+    private TouchEventData.EventType mEventType;
+    // Following fields are the of the pending TouchEventData. They will be added to {@link #data}

[Lambros, 2016/06/17 23:00:11]

Blank line.

[Hzj_jie, 2016/06/19 23:41:40]

Done.

+    // by calling appendData().
+    private int mId;
+    private float mX;
+    private float mY;
+    private float mRadiusX;
+    private float mRadiusY;
+    private float mAngleInRadians;
+    private float mPressure;
+
+    public TouchEventBuilder() {
+        mData = new ArrayList<>();
+        clear();
+    }
+
+    public TouchEventBuilder withEventType(TouchEventData.EventType eventType) {
+        mEventType = eventType;
+        return this;
+    }
+
+    public TouchEventBuilder withId(int id) {
+        mId = id;
+        return this;
+    }
+
+    public TouchEventBuilder withX(float x) {
+        mX = x;
+        return this;
+    }
+
+    public TouchEventBuilder withY(float y) {
+        mY = y;
+        return this;
+    }
+
+    public TouchEventBuilder withRadiusX(float radiusX) {
+        mRadiusX = radiusX;
+        return this;
+    }
+
+    public TouchEventBuilder withRadiusY(float radiusY) {
+        mRadiusY = radiusY;
+        return this;
+    }
+
+    public TouchEventBuilder withAngleInRadians(float angleInRadians) {
+        mAngleInRadians = angleInRadians;
+        return this;
+    }
+
+    public TouchEventBuilder withPressure(float pressure) {
+        mPressure = pressure;
+        return this;
+    }
+
+    public TouchEventBuilder append() {
+        mData.add(new TouchEventData(mId, mX, mY, mRadiusX, mRadiusY, mAngleInRadians, mPressure));
+        resetPending();
+        return this;
+    }
+
+    public MockInputInjector.TouchEvent build() {
+        return new MockInputInjector.TouchEvent(mEventType, mData.toArray(new TouchEventData[] {}));
+    }
+
+    private void clear() {
+        mEventType = TouchEventData.EventType.TOUCH_EVENT_UNKNOWN;
+        mData.clear();
+        resetPending();
+    }
+
+    private void resetPending() {
+        mId = MockInputInjector.TouchEvent.INVALID_ID;
+        mX = MockInputInjector.TouchEvent.INVALID_POSITION;
+        mY = MockInputInjector.TouchEvent.INVALID_POSITION;
+        mRadiusX = MockInputInjector.TouchEvent.INVALID_POSITION;
+        mRadiusY = MockInputInjector.TouchEvent.INVALID_POSITION;
+        mAngleInRadians = MockInputInjector.TouchEvent.INVALID_RADIANS;
+        mPressure = MockInputInjector.TouchEvent.INVALID_POSITION;
+    }
+}