86 lines
3.5 KiB
Java
86 lines
3.5 KiB
Java
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.policy;
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import android.graphics.Rect;
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import android.view.animation.ClipRectAnimation;
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import android.view.animation.Interpolator;
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import android.view.animation.Transformation;
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/**
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* Special case of ClipRectAnimation that animates only the top/bottom
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* dimensions of the clip, picking up the other dimensions from whatever is
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* set on the transform already. In addition to that, information about a vertical translation
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* animation can be specified so this animation simulates as the clip would be applied after instead
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* of before applying the translation.
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*/
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public class ClipRectTBAnimation extends ClipRectAnimation {
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private final int mFromTranslateY;
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private final int mToTranslateY;
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private final Interpolator mTranslateInterpolator;
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private float mNormalizedTime;
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/**
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* Constructor. Passes in 0 for Left/Right parameters of ClipRectAnimation
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*/
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public ClipRectTBAnimation(int fromT, int fromB, int toT, int toB,
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int fromTranslateY, int toTranslateY, Interpolator translateInterpolator) {
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super(0, fromT, 0, fromB, 0, toT, 0, toB);
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mFromTranslateY = fromTranslateY;
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mToTranslateY = toTranslateY;
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mTranslateInterpolator = translateInterpolator;
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}
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@Override
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public boolean getTransformation(long currentTime, Transformation outTransformation) {
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// Hack: Because translation animation has a different interpolator, we need to duplicate
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// code from Animation here and use it to calculate/store the uninterpolated normalized
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// time.
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final long startOffset = getStartOffset();
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final long duration = getDuration();
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float normalizedTime;
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if (duration != 0) {
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normalizedTime = ((float) (currentTime - (getStartTime() + startOffset))) /
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(float) duration;
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} else {
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// time is a step-change with a zero duration
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normalizedTime = currentTime < getStartTime() ? 0.0f : 1.0f;
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}
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mNormalizedTime = normalizedTime;
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return super.getTransformation(currentTime, outTransformation);
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}
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/**
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* Calculates and sets clip rect on given transformation. It uses existing values
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* on the Transformation for Left/Right clip parameters.
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*/
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@Override
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protected void applyTransformation(float it, Transformation tr) {
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float translationT = mTranslateInterpolator.getInterpolation(mNormalizedTime);
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int translation =
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(int) (mFromTranslateY + (mToTranslateY - mFromTranslateY) * translationT);
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Rect oldClipRect = tr.getClipRect();
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tr.setClipRect(oldClipRect.left,
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mFromRect.top - translation + (int) ((mToRect.top - mFromRect.top) * it),
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oldClipRect.right,
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mFromRect.bottom - translation + (int) ((mToRect.bottom - mFromRect.bottom) * it));
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}
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}
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