Rotatable.java

/*
 * Copyright 2017-present The Material Motion Authors. All Rights Reserved.
 *
 * 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.google.android.material.motion.interactions;

import android.view.View;

import com.google.android.material.motion.ConstraintApplicator;
import com.google.android.material.motion.MotionObservable;
import com.google.android.material.motion.MotionRuntime;
import com.google.android.material.motion.gestures.RotateGestureRecognizer;
import com.google.android.material.motion.gestures.GestureInteraction;

import static com.google.android.material.motion.operators.Rotated.rotated;

/**
 * A rotatable interaction.
 */
public class Rotatable extends GestureInteraction<RotateGestureRecognizer, Float> {

  public Rotatable() {
    this(new RotateGestureRecognizer());
  }

  public Rotatable(RotateGestureRecognizer gestureRecognizer) {
    super(gestureRecognizer);
  }

  @Override
  protected void onApply(
    MotionRuntime runtime,
    MotionObservable<RotateGestureRecognizer> stream,
    final View target,
    ConstraintApplicator<Float> constraints) {
    MotionObservable<Float> rotatedStream = stream.compose(rotated(target));

    runtime.write(constraints.apply(rotatedStream), target, View.ROTATION);
  }
}