199 lines
7.4 KiB
Java
199 lines
7.4 KiB
Java
/*
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* Copyright (C) 2013 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.AnimatorListenerAdapter;
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import android.animation.ObjectAnimator;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.View;
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import android.view.ViewGroup;
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import com.android.internal.R;
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/**
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* This transition tracks changes to the visibility of target views in the
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* start and end scenes and fades views in or out when they become visible
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* or non-visible. Visibility is determined by both the
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* {@link View#setVisibility(int)} state of the view as well as whether it
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* is parented in the current view hierarchy.
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*
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* <p>The ability of this transition to fade out a particular view, and the
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* way that that fading operation takes place, is based on
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* the situation of the view in the view hierarchy. For example, if a view was
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* simply removed from its parent, then the view will be added into a {@link
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* android.view.ViewGroupOverlay} while fading. If a visible view is
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* changed to be {@link View#GONE} or {@link View#INVISIBLE}, then the
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* visibility will be changed to {@link View#VISIBLE} for the duration of
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* the animation. However, if a view is in a hierarchy which is also altering
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* its visibility, the situation can be more complicated. In general, if a
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* view that is no longer in the hierarchy in the end scene still has a
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* parent (so its parent hierarchy was removed, but it was not removed from
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* its parent), then it will be left alone to avoid side-effects from
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* improperly removing it from its parent. The only exception to this is if
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* the previous {@link Scene} was
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* {@link Scene#getSceneForLayout(android.view.ViewGroup, int, android.content.Context)
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* created from a layout resource file}, then it is considered safe to un-parent
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* the starting scene view in order to fade it out.</p>
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*
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* <p>A Fade transition can be described in a resource file by using the
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* tag <code>fade</code>, along with the standard
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* attributes of {@link android.R.styleable#Fade} and
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* {@link android.R.styleable#Transition}.</p>
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*/
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public class Fade extends Visibility {
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static final String PROPNAME_TRANSITION_ALPHA = "android:fade:transitionAlpha";
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private static boolean DBG = Transition.DBG && false;
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private static final String LOG_TAG = "Fade";
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/**
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* Fading mode used in {@link #Fade(int)} to make the transition
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* operate on targets that are appearing. Maybe be combined with
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* {@link #OUT} to fade both in and out. Equivalent to
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* {@link Visibility#MODE_IN}.
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*/
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public static final int IN = Visibility.MODE_IN;
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/**
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* Fading mode used in {@link #Fade(int)} to make the transition
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* operate on targets that are disappearing. Maybe be combined with
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* {@link #IN} to fade both in and out. Equivalent to
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* {@link Visibility#MODE_OUT}.
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*/
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public static final int OUT = Visibility.MODE_OUT;
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/**
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* Constructs a Fade transition that will fade targets in and out.
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*/
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public Fade() {
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}
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/**
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* Constructs a Fade transition that will fade targets in
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* and/or out, according to the value of fadingMode.
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*
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* @param fadingMode The behavior of this transition, a combination of
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* {@link #IN} and {@link #OUT}.
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*/
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public Fade(@VisibilityMode int fadingMode) {
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setMode(fadingMode);
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}
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public Fade(Context context, AttributeSet attrs) {
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super(context, attrs);
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Fade);
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int fadingMode = a.getInt(R.styleable.Fade_fadingMode, getMode());
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setMode(fadingMode);
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a.recycle();
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}
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@Override
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public void captureStartValues(TransitionValues transitionValues) {
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super.captureStartValues(transitionValues);
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transitionValues.values.put(PROPNAME_TRANSITION_ALPHA,
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transitionValues.view.getTransitionAlpha());
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}
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/**
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* Utility method to handle creating and running the Animator.
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*/
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private Animator createAnimation(final View view, float startAlpha, final float endAlpha) {
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if (startAlpha == endAlpha) {
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return null;
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}
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view.setTransitionAlpha(startAlpha);
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final ObjectAnimator anim = ObjectAnimator.ofFloat(view, "transitionAlpha", endAlpha);
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if (DBG) {
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Log.d(LOG_TAG, "Created animator " + anim);
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}
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final FadeAnimatorListener listener = new FadeAnimatorListener(view);
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anim.addListener(listener);
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addListener(new TransitionListenerAdapter() {
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@Override
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public void onTransitionEnd(Transition transition) {
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view.setTransitionAlpha(1);
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transition.removeListener(this);
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}
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});
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return anim;
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}
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@Override
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public Animator onAppear(ViewGroup sceneRoot, View view,
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TransitionValues startValues,
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TransitionValues endValues) {
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if (DBG) {
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View startView = (startValues != null) ? startValues.view : null;
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Log.d(LOG_TAG, "Fade.onAppear: startView, startVis, endView, endVis = " +
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startView + ", " + view);
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}
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float startAlpha = getStartAlpha(startValues, 0);
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if (startAlpha == 1) {
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startAlpha = 0;
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}
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return createAnimation(view, startAlpha, 1);
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}
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@Override
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public Animator onDisappear(ViewGroup sceneRoot, final View view, TransitionValues startValues,
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TransitionValues endValues) {
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float startAlpha = getStartAlpha(startValues, 1);
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return createAnimation(view, startAlpha, 0);
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}
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private static float getStartAlpha(TransitionValues startValues, float fallbackValue) {
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float startAlpha = fallbackValue;
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if (startValues != null) {
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Float startAlphaFloat = (Float) startValues.values.get(PROPNAME_TRANSITION_ALPHA);
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if (startAlphaFloat != null) {
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startAlpha = startAlphaFloat;
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}
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}
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return startAlpha;
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}
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private static class FadeAnimatorListener extends AnimatorListenerAdapter {
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private final View mView;
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private boolean mLayerTypeChanged = false;
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public FadeAnimatorListener(View view) {
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mView = view;
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}
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@Override
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public void onAnimationStart(Animator animator) {
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if (mView.hasOverlappingRendering() && mView.getLayerType() == View.LAYER_TYPE_NONE) {
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mLayerTypeChanged = true;
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mView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
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}
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}
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@Override
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public void onAnimationEnd(Animator animator) {
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mView.setTransitionAlpha(1);
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if (mLayerTypeChanged) {
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mView.setLayerType(View.LAYER_TYPE_NONE, null);
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}
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}
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}
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}
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