content: /*
   * Copyright (C) 2015 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.view.animation;
  
  import android.annotation.UnsupportedAppUsage;
  import android.graphics.Matrix;
  
  /**
   * Special case of TranslateAnimation that translates only vertically, picking up the
   * horizontal values from whatever is set on the Transformation already. When used in
   * conjunction with a TranslateXAnimation, allows independent animation of x and y
   * position.
   * @hide
   */
  public class TranslateYAnimation extends TranslateAnimation {
      float[] mTmpValues = new float[9];
  
      /**
       * Constructor. Passes in 0 for the x parameters of TranslateAnimation
       */
      public TranslateYAnimation(float fromYDelta, float toYDelta) {
          super(0, 0, fromYDelta, toYDelta);
      }
  
      /**
       * Constructor. Passes in 0 for the x parameters of TranslateAnimation
       */
      @UnsupportedAppUsage
      public TranslateYAnimation(int fromYType, float fromYValue, int toYType, float toYValue) {
          super(ABSOLUTE, 0, ABSOLUTE, 0, fromYType, fromYValue, toYType, toYValue);
      }
  
      /**
       * Calculates and sets y translation values on given transformation.
       */
      @Override
      protected void applyTransformation(float interpolatedTime, Transformation t) {
          Matrix m = t.getMatrix();
          m.getValues(mTmpValues);
          float dy = mFromYDelta + ((mToYDelta - mFromYDelta) * interpolatedTime);
          t.getMatrix().setTranslate(mTmpValues[Matrix.MTRANS_X], dy);
      }
  }
  