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/*
* 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 com.android.internal.policy;
import android.graphics.Rect;
import android.view.animation.ClipRectAnimation;
import android.view.animation.Interpolator;
import android.view.animation.Transformation;
/**
* Special case of ClipRectAnimation that animates only the top/bottom
* dimensions of the clip, picking up the other dimensions from whatever is
* set on the transform already. In addition to that, information about a vertical translation
* animation can be specified so this animation simulates as the clip would be applied after instead
* of before applying the translation.
*/
public class ClipRectTBAnimation extends ClipRectAnimation {
private final int mFromTranslateY;
private final int mToTranslateY;
private final Interpolator mTranslateInterpolator;
private float mNormalizedTime;
/**
* Constructor. Passes in 0 for Left/Right parameters of ClipRectAnimation
*/
public ClipRectTBAnimation(int fromT, int fromB, int toT, int toB,
int fromTranslateY, int toTranslateY, Interpolator translateInterpolator) {
super(0, fromT, 0, fromB, 0, toT, 0, toB);
mFromTranslateY = fromTranslateY;
mToTranslateY = toTranslateY;
mTranslateInterpolator = translateInterpolator;
}
@Override
public boolean getTransformation(long currentTime, Transformation outTransformation) {
// Hack: Because translation animation has a different interpolator, we need to duplicate
// code from Animation here and use it to calculate/store the uninterpolated normalized
// time.
final long startOffset = getStartOffset();
final long duration = getDuration();
float normalizedTime;
if (duration != 0) {
normalizedTime = ((float) (currentTime - (getStartTime() + startOffset))) /
(float) duration;
} else {
// time is a step-change with a zero duration
normalizedTime = currentTime < getStartTime() ? 0.0f : 1.0f;
}
mNormalizedTime = normalizedTime;
return super.getTransformation(currentTime, outTransformation);
}
/**
* Calculates and sets clip rect on given transformation. It uses existing values
* on the Transformation for Left/Right clip parameters.
*/
@Override
protected void applyTransformation(float it, Transformation tr) {
float translationT = mTranslateInterpolator.getInterpolation(mNormalizedTime);
int translation =
(int) (mFromTranslateY + (mToTranslateY - mFromTranslateY) * translationT);
Rect oldClipRect = tr.getClipRect();
tr.setClipRect(oldClipRect.left,
mFromRect.top - translation + (int) ((mToRect.top - mFromRect.top) * it),
oldClipRect.right,
mFromRect.bottom - translation + (int) ((mToRect.bottom - mFromRect.bottom) * it));
}
}
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