132 lines
4.0 KiB
Java
132 lines
4.0 KiB
Java
/*
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* Copyright (C) 2015 Hippo Seven
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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.hippo.view;
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import android.animation.Animator;
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import android.animation.ObjectAnimator;
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import android.view.View;
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import com.hippo.yorozuya.SimpleAnimatorListener;
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public class ViewTransition {
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private static final long ANIMATE_TIME = 300L;
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private final View[] mViews;
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private int mShownView = -1;
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private Animator mAnimator1;
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private Animator mAnimator2;
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public ViewTransition(View... views) {
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if (views.length < 2) {
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throw new IllegalStateException("You must pass view to ViewTransition");
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}
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for (View v : views) {
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if (v == null) {
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throw new IllegalStateException("Any View pass to ViewTransition must not be null");
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}
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}
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mViews = views;
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showView(0, false);
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}
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public int getShownViewIndex() {
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return mShownView;
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}
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public boolean showView(int shownView) {
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return showView(shownView, true);
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}
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public boolean showView(int shownView, boolean animation) {
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View[] views = mViews;
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int length = views.length;
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if (shownView >= length || shownView < 0) {
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throw new IndexOutOfBoundsException("Only " + length + " view(s) in " +
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"the ViewTransition, but attempt to show " + shownView);
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}
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if (mShownView != shownView) {
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int oldShownView = mShownView;
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mShownView = shownView;
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// Cancel animation
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if (mAnimator1 != null) {
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mAnimator1.cancel();
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}
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if (mAnimator2 != null) {
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mAnimator2.cancel();
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}
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if (animation) {
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for (int i = 0; i < length; i++) {
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if (i != oldShownView && i != shownView) {
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View v = views[i];
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v.setAlpha(0f);
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v.setVisibility(View.GONE);
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}
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}
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startAnimations(views[oldShownView], views[shownView]);
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} else {
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for (int i = 0; i < length; i++) {
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View v = views[i];
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if (i == shownView) {
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v.setAlpha(1f);
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v.setVisibility(View.VISIBLE);
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} else {
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v.setAlpha(0f);
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v.setVisibility(View.GONE);
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}
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}
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}
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return true;
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} else {
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return false;
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}
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}
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private void startAnimations(final View hiddenView, final View shownView) {
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ObjectAnimator oa1 = ObjectAnimator.ofFloat(hiddenView, "alpha", 0f);
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oa1.setDuration(ANIMATE_TIME);
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oa1.addListener(new SimpleAnimatorListener() {
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@Override
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public void onAnimationEnd(Animator animation) {
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hiddenView.setVisibility(View.GONE);
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mAnimator1 = null;
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}
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});
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oa1.start();
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mAnimator1 = oa1;
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shownView.setVisibility(View.VISIBLE);
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ObjectAnimator oa2 = ObjectAnimator.ofFloat(shownView, "alpha", 1f);
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oa2.setDuration(ANIMATE_TIME);
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oa2.addListener(new SimpleAnimatorListener() {
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@Override
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public void onAnimationEnd(Animator animation) {
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mAnimator2 = null;
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}
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});
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oa2.start();
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mAnimator2 = oa2;
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}
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}
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