94 lines
3.2 KiB
Java
94 lines
3.2 KiB
Java
/*
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* Copyright (C) 2014 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 android.transition;
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import android.animation.Animator;
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import android.animation.ObjectAnimator;
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import android.annotation.NonNull;
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import android.annotation.Nullable;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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/**
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* This transition captures the scroll properties of targets before and after
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* the scene change and animates any changes.
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*/
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public class ChangeScroll extends Transition {
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private static final String PROPNAME_SCROLL_X = "android:changeScroll:x";
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private static final String PROPNAME_SCROLL_Y = "android:changeScroll:y";
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private static final String[] PROPERTIES = {
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PROPNAME_SCROLL_X,
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PROPNAME_SCROLL_Y,
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};
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public ChangeScroll() {}
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public ChangeScroll(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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public void captureStartValues(TransitionValues transitionValues) {
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captureValues(transitionValues);
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}
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@Override
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public void captureEndValues(TransitionValues transitionValues) {
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captureValues(transitionValues);
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}
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@Override
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public String[] getTransitionProperties() {
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return PROPERTIES;
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}
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private void captureValues(TransitionValues transitionValues) {
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transitionValues.values.put(PROPNAME_SCROLL_X, transitionValues.view.getScrollX());
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transitionValues.values.put(PROPNAME_SCROLL_Y, transitionValues.view.getScrollY());
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}
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@Nullable
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@Override
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public Animator createAnimator(@NonNull ViewGroup sceneRoot,
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@Nullable TransitionValues startValues,
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@Nullable TransitionValues endValues) {
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if (startValues == null || endValues == null) {
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return null;
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}
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final View view = endValues.view;
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int startX = (Integer) startValues.values.get(PROPNAME_SCROLL_X);
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int endX = (Integer) endValues.values.get(PROPNAME_SCROLL_X);
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int startY = (Integer) startValues.values.get(PROPNAME_SCROLL_Y);
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int endY = (Integer) endValues.values.get(PROPNAME_SCROLL_Y);
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Animator scrollXAnimator = null;
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Animator scrollYAnimator = null;
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if (startX != endX) {
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view.setScrollX(startX);
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scrollXAnimator = ObjectAnimator.ofInt(view, "scrollX", startX, endX);
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}
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if (startY != endY) {
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view.setScrollY(startY);
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scrollYAnimator = ObjectAnimator.ofInt(view, "scrollY", startY, endY);
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}
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return TransitionUtils.mergeAnimators(scrollXAnimator, scrollYAnimator);
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}
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}
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