| /* |
| * Copyright (C) 2010 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 android.animation; |
| |
| import android.compat.annotation.UnsupportedAppUsage; |
| import android.os.Build; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.ViewParent; |
| import android.view.ViewTreeObserver; |
| import android.view.animation.AccelerateDecelerateInterpolator; |
| import android.view.animation.DecelerateInterpolator; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * This class enables automatic animations on layout changes in ViewGroup objects. To enable |
| * transitions for a layout container, create a LayoutTransition object and set it on any |
| * ViewGroup by calling {@link ViewGroup#setLayoutTransition(LayoutTransition)}. This will cause |
| * default animations to run whenever items are added to or removed from that container. To specify |
| * custom animations, use the {@link LayoutTransition#setAnimator(int, Animator) |
| * setAnimator()} method. |
| * |
| * <p>One of the core concepts of these transition animations is that there are two types of |
| * changes that cause the transition and four different animations that run because of |
| * those changes. The changes that trigger the transition are items being added to a container |
| * (referred to as an "appearing" transition) or removed from a container (also known as |
| * "disappearing"). Setting the visibility of views (between GONE and VISIBLE) will trigger |
| * the same add/remove logic. The animations that run due to those events are one that animates |
| * items being added, one that animates items being removed, and two that animate the other |
| * items in the container that change due to the add/remove occurrence. Users of |
| * the transition may want different animations for the changing items depending on whether |
| * they are changing due to an appearing or disappearing event, so there is one animation for |
| * each of these variations of the changing event. Most of the API of this class is concerned |
| * with setting up the basic properties of the animations used in these four situations, |
| * or with setting up custom animations for any or all of the four.</p> |
| * |
| * <p>By default, the DISAPPEARING animation begins immediately, as does the CHANGE_APPEARING |
| * animation. The other animations begin after a delay that is set to the default duration |
| * of the animations. This behavior facilitates a sequence of animations in transitions as |
| * follows: when an item is being added to a layout, the other children of that container will |
| * move first (thus creating space for the new item), then the appearing animation will run to |
| * animate the item being added. Conversely, when an item is removed from a container, the |
| * animation to remove it will run first, then the animations of the other children in the |
| * layout will run (closing the gap created in the layout when the item was removed). If this |
| * default choreography behavior is not desired, the {@link #setDuration(int, long)} and |
| * {@link #setStartDelay(int, long)} of any or all of the animations can be changed as |
| * appropriate. Keep in mind, however, that if you start an APPEARING animation before a |
| * DISAPPEARING animation is completed, the DISAPPEARING animation stops, and any effects from |
| * the DISAPPEARING animation are reverted. If you instead start a DISAPPEARING animation |
| * before an APPEARING animation is completed, a similar set of effects occurs for the |
| * APPEARING animation.</p> |
| * |
| * <p>The animations specified for the transition, both the defaults and any custom animations |
| * set on the transition object, are templates only. That is, these animations exist to hold the |
| * basic animation properties, such as the duration, start delay, and properties being animated. |
| * But the actual target object, as well as the start and end values for those properties, are |
| * set automatically in the process of setting up the transition each time it runs. Each of the |
| * animations is cloned from the original copy and the clone is then populated with the dynamic |
| * values of the target being animated (such as one of the items in a layout container that is |
| * moving as a result of the layout event) as well as the values that are changing (such as the |
| * position and size of that object). The actual values that are pushed to each animation |
| * depends on what properties are specified for the animation. For example, the default |
| * CHANGE_APPEARING animation animates the <code>left</code>, <code>top</code>, <code>right</code>, |
| * <code>bottom</code>, <code>scrollX</code>, and <code>scrollY</code> properties. |
| * Values for these properties are updated with the pre- and post-layout |
| * values when the transition begins. Custom animations will be similarly populated with |
| * the target and values being animated, assuming they use ObjectAnimator objects with |
| * property names that are known on the target object.</p> |
| * |
| * <p>This class, and the associated XML flag for containers, animateLayoutChanges="true", |
| * provides a simple utility meant for automating changes in straightforward situations. |
| * Using LayoutTransition at multiple levels of a nested view hierarchy may not work due to the |
| * interrelationship of the various levels of layout. Also, a container that is being scrolled |
| * at the same time as items are being added or removed is probably not a good candidate for |
| * this utility, because the before/after locations calculated by LayoutTransition |
| * may not match the actual locations when the animations finish due to the container |
| * being scrolled as the animations are running. You can work around that |
| * particular issue by disabling the 'changing' animations by setting the CHANGE_APPEARING |
| * and CHANGE_DISAPPEARING animations to null, and setting the startDelay of the |
| * other animations appropriately.</p> |
| */ |
| public class LayoutTransition { |
| |
| /** |
| * A flag indicating the animation that runs on those items that are changing |
| * due to a new item appearing in the container. |
| */ |
| public static final int CHANGE_APPEARING = 0; |
| |
| /** |
| * A flag indicating the animation that runs on those items that are changing |
| * due to an item disappearing from the container. |
| */ |
| public static final int CHANGE_DISAPPEARING = 1; |
| |
| /** |
| * A flag indicating the animation that runs on those items that are appearing |
| * in the container. |
| */ |
| public static final int APPEARING = 2; |
| |
| /** |
| * A flag indicating the animation that runs on those items that are disappearing |
| * from the container. |
| */ |
| public static final int DISAPPEARING = 3; |
| |
| /** |
| * A flag indicating the animation that runs on those items that are changing |
| * due to a layout change not caused by items being added to or removed |
| * from the container. This transition type is not enabled by default; it can be |
| * enabled via {@link #enableTransitionType(int)}. |
| */ |
| public static final int CHANGING = 4; |
| |
| /** |
| * Private bit fields used to set the collection of enabled transition types for |
| * mTransitionTypes. |
| */ |
| private static final int FLAG_APPEARING = 0x01; |
| private static final int FLAG_DISAPPEARING = 0x02; |
| private static final int FLAG_CHANGE_APPEARING = 0x04; |
| private static final int FLAG_CHANGE_DISAPPEARING = 0x08; |
| private static final int FLAG_CHANGING = 0x10; |
| |
| /** |
| * These variables hold the animations that are currently used to run the transition effects. |
| * These animations are set to defaults, but can be changed to custom animations by |
| * calls to setAnimator(). |
| */ |
| private Animator mDisappearingAnim = null; |
| private Animator mAppearingAnim = null; |
| private Animator mChangingAppearingAnim = null; |
| private Animator mChangingDisappearingAnim = null; |
| private Animator mChangingAnim = null; |
| |
| /** |
| * These are the default animations, defined in the constructor, that will be used |
| * unless the user specifies custom animations. |
| */ |
| private static ObjectAnimator defaultChange; |
| private static ObjectAnimator defaultChangeIn; |
| private static ObjectAnimator defaultChangeOut; |
| private static ObjectAnimator defaultFadeIn; |
| private static ObjectAnimator defaultFadeOut; |
| |
| /** |
| * The default duration used by all animations. |
| */ |
| private static long DEFAULT_DURATION = 300; |
| |
| /** |
| * The durations of the different animations |
| */ |
| private long mChangingAppearingDuration = DEFAULT_DURATION; |
| private long mChangingDisappearingDuration = DEFAULT_DURATION; |
| private long mChangingDuration = DEFAULT_DURATION; |
| private long mAppearingDuration = DEFAULT_DURATION; |
| private long mDisappearingDuration = DEFAULT_DURATION; |
| |
| /** |
| * The start delays of the different animations. Note that the default behavior of |
| * the appearing item is the default duration, since it should wait for the items to move |
| * before fading it. Same for the changing animation when disappearing; it waits for the item |
| * to fade out before moving the other items. |
| */ |
| private long mAppearingDelay = DEFAULT_DURATION; |
| private long mDisappearingDelay = 0; |
| private long mChangingAppearingDelay = 0; |
| private long mChangingDisappearingDelay = DEFAULT_DURATION; |
| private long mChangingDelay = 0; |
| |
| /** |
| * The inter-animation delays used on the changing animations |
| */ |
| private long mChangingAppearingStagger = 0; |
| private long mChangingDisappearingStagger = 0; |
| private long mChangingStagger = 0; |
| |
| /** |
| * Static interpolators - these are stateless and can be shared across the instances |
| */ |
| private static TimeInterpolator ACCEL_DECEL_INTERPOLATOR = |
| new AccelerateDecelerateInterpolator(); |
| private static TimeInterpolator DECEL_INTERPOLATOR = new DecelerateInterpolator(); |
| private static TimeInterpolator sAppearingInterpolator = ACCEL_DECEL_INTERPOLATOR; |
| private static TimeInterpolator sDisappearingInterpolator = ACCEL_DECEL_INTERPOLATOR; |
| private static TimeInterpolator sChangingAppearingInterpolator = DECEL_INTERPOLATOR; |
| private static TimeInterpolator sChangingDisappearingInterpolator = DECEL_INTERPOLATOR; |
| private static TimeInterpolator sChangingInterpolator = DECEL_INTERPOLATOR; |
| |
| /** |
| * The default interpolators used for the animations |
| */ |
| private TimeInterpolator mAppearingInterpolator = sAppearingInterpolator; |
| private TimeInterpolator mDisappearingInterpolator = sDisappearingInterpolator; |
| private TimeInterpolator mChangingAppearingInterpolator = sChangingAppearingInterpolator; |
| private TimeInterpolator mChangingDisappearingInterpolator = sChangingDisappearingInterpolator; |
| private TimeInterpolator mChangingInterpolator = sChangingInterpolator; |
| |
| /** |
| * These hashmaps are used to store the animations that are currently running as part of |
| * the transition. The reason for this is that a further layout event should cause |
| * existing animations to stop where they are prior to starting new animations. So |
| * we cache all of the current animations in this map for possible cancellation on |
| * another layout event. LinkedHashMaps are used to preserve the order in which animations |
| * are inserted, so that we process events (such as setting up start values) in the same order. |
| */ |
| private final HashMap<View, Animator> pendingAnimations = |
| new HashMap<View, Animator>(); |
| private final LinkedHashMap<View, Animator> currentChangingAnimations = |
| new LinkedHashMap<View, Animator>(); |
| private final LinkedHashMap<View, Animator> currentAppearingAnimations = |
| new LinkedHashMap<View, Animator>(); |
| private final LinkedHashMap<View, Animator> currentDisappearingAnimations = |
| new LinkedHashMap<View, Animator>(); |
| |
| /** |
| * This hashmap is used to track the listeners that have been added to the children of |
| * a container. When a layout change occurs, an animation is created for each View, so that |
| * the pre-layout values can be cached in that animation. Then a listener is added to the |
| * view to see whether the layout changes the bounds of that view. If so, the animation |
| * is set with the final values and then run. If not, the animation is not started. When |
| * the process of setting up and running all appropriate animations is done, we need to |
| * remove these listeners and clear out the map. |
| */ |
| private final HashMap<View, View.OnLayoutChangeListener> layoutChangeListenerMap = |
| new HashMap<View, View.OnLayoutChangeListener>(); |
| |
| /** |
| * Used to track the current delay being assigned to successive animations as they are |
| * started. This value is incremented for each new animation, then zeroed before the next |
| * transition begins. |
| */ |
| private long staggerDelay; |
| |
| /** |
| * These are the types of transition animations that the LayoutTransition is reacting |
| * to. By default, appearing/disappearing and the change animations related to them are |
| * enabled (not CHANGING). |
| */ |
| private int mTransitionTypes = FLAG_CHANGE_APPEARING | FLAG_CHANGE_DISAPPEARING | |
| FLAG_APPEARING | FLAG_DISAPPEARING; |
| /** |
| * The set of listeners that should be notified when APPEARING/DISAPPEARING transitions |
| * start and end. |
| */ |
| private ArrayList<TransitionListener> mListeners; |
| |
| /** |
| * Controls whether changing animations automatically animate the parent hierarchy as well. |
| * This behavior prevents artifacts when wrap_content layouts snap to the end state as the |
| * transition begins, causing visual glitches and clipping. |
| * Default value is true. |
| */ |
| private boolean mAnimateParentHierarchy = true; |
| |
| |
| /** |
| * Constructs a LayoutTransition object. By default, the object will listen to layout |
| * events on any ViewGroup that it is set on and will run default animations for each |
| * type of layout event. |
| */ |
| public LayoutTransition() { |
| if (defaultChangeIn == null) { |
| // "left" is just a placeholder; we'll put real properties/values in when needed |
| PropertyValuesHolder pvhLeft = PropertyValuesHolder.ofInt("left", 0, 1); |
| PropertyValuesHolder pvhTop = PropertyValuesHolder.ofInt("top", 0, 1); |
| PropertyValuesHolder pvhRight = PropertyValuesHolder.ofInt("right", 0, 1); |
| PropertyValuesHolder pvhBottom = PropertyValuesHolder.ofInt("bottom", 0, 1); |
| PropertyValuesHolder pvhScrollX = PropertyValuesHolder.ofInt("scrollX", 0, 1); |
| PropertyValuesHolder pvhScrollY = PropertyValuesHolder.ofInt("scrollY", 0, 1); |
| defaultChangeIn = ObjectAnimator.ofPropertyValuesHolder((Object)null, |
| pvhLeft, pvhTop, pvhRight, pvhBottom, pvhScrollX, pvhScrollY); |
| defaultChangeIn.setDuration(DEFAULT_DURATION); |
| defaultChangeIn.setStartDelay(mChangingAppearingDelay); |
| defaultChangeIn.setInterpolator(mChangingAppearingInterpolator); |
| defaultChangeOut = defaultChangeIn.clone(); |
| defaultChangeOut.setStartDelay(mChangingDisappearingDelay); |
| defaultChangeOut.setInterpolator(mChangingDisappearingInterpolator); |
| defaultChange = defaultChangeIn.clone(); |
| defaultChange.setStartDelay(mChangingDelay); |
| defaultChange.setInterpolator(mChangingInterpolator); |
| |
| defaultFadeIn = ObjectAnimator.ofFloat(null, "alpha", 0f, 1f); |
| defaultFadeIn.setDuration(DEFAULT_DURATION); |
| defaultFadeIn.setStartDelay(mAppearingDelay); |
| defaultFadeIn.setInterpolator(mAppearingInterpolator); |
| defaultFadeOut = ObjectAnimator.ofFloat(null, "alpha", 1f, 0f); |
| defaultFadeOut.setDuration(DEFAULT_DURATION); |
| defaultFadeOut.setStartDelay(mDisappearingDelay); |
| defaultFadeOut.setInterpolator(mDisappearingInterpolator); |
| } |
| mChangingAppearingAnim = defaultChangeIn; |
| mChangingDisappearingAnim = defaultChangeOut; |
| mChangingAnim = defaultChange; |
| mAppearingAnim = defaultFadeIn; |
| mDisappearingAnim = defaultFadeOut; |
| } |
| |
| /** |
| * Sets the duration to be used by all animations of this transition object. If you want to |
| * set the duration of just one of the animations in particular, use the |
| * {@link #setDuration(int, long)} method. |
| * |
| * @param duration The length of time, in milliseconds, that the transition animations |
| * should last. |
| */ |
| public void setDuration(long duration) { |
| mChangingAppearingDuration = duration; |
| mChangingDisappearingDuration = duration; |
| mChangingDuration = duration; |
| mAppearingDuration = duration; |
| mDisappearingDuration = duration; |
| } |
| |
| /** |
| * Enables the specified transitionType for this LayoutTransition object. |
| * By default, a LayoutTransition listens for changes in children being |
| * added/remove/hidden/shown in the container, and runs the animations associated with |
| * those events. That is, all transition types besides {@link #CHANGING} are enabled by default. |
| * You can also enable {@link #CHANGING} animations by calling this method with the |
| * {@link #CHANGING} transitionType. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}. |
| */ |
| public void enableTransitionType(int transitionType) { |
| switch (transitionType) { |
| case APPEARING: |
| mTransitionTypes |= FLAG_APPEARING; |
| break; |
| case DISAPPEARING: |
| mTransitionTypes |= FLAG_DISAPPEARING; |
| break; |
| case CHANGE_APPEARING: |
| mTransitionTypes |= FLAG_CHANGE_APPEARING; |
| break; |
| case CHANGE_DISAPPEARING: |
| mTransitionTypes |= FLAG_CHANGE_DISAPPEARING; |
| break; |
| case CHANGING: |
| mTransitionTypes |= FLAG_CHANGING; |
| break; |
| } |
| } |
| |
| /** |
| * Disables the specified transitionType for this LayoutTransition object. |
| * By default, all transition types except {@link #CHANGING} are enabled. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}. |
| */ |
| public void disableTransitionType(int transitionType) { |
| switch (transitionType) { |
| case APPEARING: |
| mTransitionTypes &= ~FLAG_APPEARING; |
| break; |
| case DISAPPEARING: |
| mTransitionTypes &= ~FLAG_DISAPPEARING; |
| break; |
| case CHANGE_APPEARING: |
| mTransitionTypes &= ~FLAG_CHANGE_APPEARING; |
| break; |
| case CHANGE_DISAPPEARING: |
| mTransitionTypes &= ~FLAG_CHANGE_DISAPPEARING; |
| break; |
| case CHANGING: |
| mTransitionTypes &= ~FLAG_CHANGING; |
| break; |
| } |
| } |
| |
| /** |
| * Returns whether the specified transitionType is enabled for this LayoutTransition object. |
| * By default, all transition types except {@link #CHANGING} are enabled. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}. |
| * @return true if the specified transitionType is currently enabled, false otherwise. |
| */ |
| public boolean isTransitionTypeEnabled(int transitionType) { |
| switch (transitionType) { |
| case APPEARING: |
| return (mTransitionTypes & FLAG_APPEARING) == FLAG_APPEARING; |
| case DISAPPEARING: |
| return (mTransitionTypes & FLAG_DISAPPEARING) == FLAG_DISAPPEARING; |
| case CHANGE_APPEARING: |
| return (mTransitionTypes & FLAG_CHANGE_APPEARING) == FLAG_CHANGE_APPEARING; |
| case CHANGE_DISAPPEARING: |
| return (mTransitionTypes & FLAG_CHANGE_DISAPPEARING) == FLAG_CHANGE_DISAPPEARING; |
| case CHANGING: |
| return (mTransitionTypes & FLAG_CHANGING) == FLAG_CHANGING; |
| } |
| return false; |
| } |
| |
| /** |
| * Sets the start delay on one of the animation objects used by this transition. The |
| * <code>transitionType</code> parameter determines the animation whose start delay |
| * is being set. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines |
| * the animation whose start delay is being set. |
| * @param delay The length of time, in milliseconds, to delay before starting the animation. |
| * @see Animator#setStartDelay(long) |
| */ |
| public void setStartDelay(int transitionType, long delay) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| mChangingAppearingDelay = delay; |
| break; |
| case CHANGE_DISAPPEARING: |
| mChangingDisappearingDelay = delay; |
| break; |
| case CHANGING: |
| mChangingDelay = delay; |
| break; |
| case APPEARING: |
| mAppearingDelay = delay; |
| break; |
| case DISAPPEARING: |
| mDisappearingDelay = delay; |
| break; |
| } |
| } |
| |
| /** |
| * Gets the start delay on one of the animation objects used by this transition. The |
| * <code>transitionType</code> parameter determines the animation whose start delay |
| * is returned. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines |
| * the animation whose start delay is returned. |
| * @return long The start delay of the specified animation. |
| * @see Animator#getStartDelay() |
| */ |
| public long getStartDelay(int transitionType) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| return mChangingAppearingDelay; |
| case CHANGE_DISAPPEARING: |
| return mChangingDisappearingDelay; |
| case CHANGING: |
| return mChangingDelay; |
| case APPEARING: |
| return mAppearingDelay; |
| case DISAPPEARING: |
| return mDisappearingDelay; |
| } |
| // shouldn't reach here |
| return 0; |
| } |
| |
| /** |
| * Sets the duration on one of the animation objects used by this transition. The |
| * <code>transitionType</code> parameter determines the animation whose duration |
| * is being set. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines |
| * the animation whose duration is being set. |
| * @param duration The length of time, in milliseconds, that the specified animation should run. |
| * @see Animator#setDuration(long) |
| */ |
| public void setDuration(int transitionType, long duration) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| mChangingAppearingDuration = duration; |
| break; |
| case CHANGE_DISAPPEARING: |
| mChangingDisappearingDuration = duration; |
| break; |
| case CHANGING: |
| mChangingDuration = duration; |
| break; |
| case APPEARING: |
| mAppearingDuration = duration; |
| break; |
| case DISAPPEARING: |
| mDisappearingDuration = duration; |
| break; |
| } |
| } |
| |
| /** |
| * Gets the duration on one of the animation objects used by this transition. The |
| * <code>transitionType</code> parameter determines the animation whose duration |
| * is returned. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines |
| * the animation whose duration is returned. |
| * @return long The duration of the specified animation. |
| * @see Animator#getDuration() |
| */ |
| public long getDuration(int transitionType) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| return mChangingAppearingDuration; |
| case CHANGE_DISAPPEARING: |
| return mChangingDisappearingDuration; |
| case CHANGING: |
| return mChangingDuration; |
| case APPEARING: |
| return mAppearingDuration; |
| case DISAPPEARING: |
| return mDisappearingDuration; |
| } |
| // shouldn't reach here |
| return 0; |
| } |
| |
| /** |
| * Sets the length of time to delay between starting each animation during one of the |
| * change animations. |
| * |
| * @param transitionType A value of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, or |
| * {@link #CHANGING}. |
| * @param duration The length of time, in milliseconds, to delay before launching the next |
| * animation in the sequence. |
| */ |
| public void setStagger(int transitionType, long duration) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| mChangingAppearingStagger = duration; |
| break; |
| case CHANGE_DISAPPEARING: |
| mChangingDisappearingStagger = duration; |
| break; |
| case CHANGING: |
| mChangingStagger = duration; |
| break; |
| // noop other cases |
| } |
| } |
| |
| /** |
| * Gets the length of time to delay between starting each animation during one of the |
| * change animations. |
| * |
| * @param transitionType A value of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, or |
| * {@link #CHANGING}. |
| * @return long The length of time, in milliseconds, to delay before launching the next |
| * animation in the sequence. |
| */ |
| public long getStagger(int transitionType) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| return mChangingAppearingStagger; |
| case CHANGE_DISAPPEARING: |
| return mChangingDisappearingStagger; |
| case CHANGING: |
| return mChangingStagger; |
| } |
| // shouldn't reach here |
| return 0; |
| } |
| |
| /** |
| * Sets the interpolator on one of the animation objects used by this transition. The |
| * <code>transitionType</code> parameter determines the animation whose interpolator |
| * is being set. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines |
| * the animation whose interpolator is being set. |
| * @param interpolator The interpolator that the specified animation should use. |
| * @see Animator#setInterpolator(TimeInterpolator) |
| */ |
| public void setInterpolator(int transitionType, TimeInterpolator interpolator) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| mChangingAppearingInterpolator = interpolator; |
| break; |
| case CHANGE_DISAPPEARING: |
| mChangingDisappearingInterpolator = interpolator; |
| break; |
| case CHANGING: |
| mChangingInterpolator = interpolator; |
| break; |
| case APPEARING: |
| mAppearingInterpolator = interpolator; |
| break; |
| case DISAPPEARING: |
| mDisappearingInterpolator = interpolator; |
| break; |
| } |
| } |
| |
| /** |
| * Gets the interpolator on one of the animation objects used by this transition. The |
| * <code>transitionType</code> parameter determines the animation whose interpolator |
| * is returned. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines |
| * the animation whose interpolator is being returned. |
| * @return TimeInterpolator The interpolator that the specified animation uses. |
| * @see Animator#setInterpolator(TimeInterpolator) |
| */ |
| public TimeInterpolator getInterpolator(int transitionType) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| return mChangingAppearingInterpolator; |
| case CHANGE_DISAPPEARING: |
| return mChangingDisappearingInterpolator; |
| case CHANGING: |
| return mChangingInterpolator; |
| case APPEARING: |
| return mAppearingInterpolator; |
| case DISAPPEARING: |
| return mDisappearingInterpolator; |
| } |
| // shouldn't reach here |
| return null; |
| } |
| |
| /** |
| * Sets the animation used during one of the transition types that may run. Any |
| * Animator object can be used, but to be most useful in the context of layout |
| * transitions, the animation should either be a ObjectAnimator or a AnimatorSet |
| * of animations including PropertyAnimators. Also, these ObjectAnimator objects |
| * should be able to get and set values on their target objects automatically. For |
| * example, a ObjectAnimator that animates the property "left" is able to set and get the |
| * <code>left</code> property from the View objects being animated by the layout |
| * transition. The transition works by setting target objects and properties |
| * dynamically, according to the pre- and post-layoout values of those objects, so |
| * having animations that can handle those properties appropriately will work best |
| * for custom animation. The dynamic setting of values is only the case for the |
| * CHANGE animations; the APPEARING and DISAPPEARING animations are simply run with |
| * the values they have. |
| * |
| * <p>It is also worth noting that any and all animations (and their underlying |
| * PropertyValuesHolder objects) will have their start and end values set according |
| * to the pre- and post-layout values. So, for example, a custom animation on "alpha" |
| * as the CHANGE_APPEARING animation will inherit the real value of alpha on the target |
| * object (presumably 1) as its starting and ending value when the animation begins. |
| * Animations which need to use values at the beginning and end that may not match the |
| * values queried when the transition begins may need to use a different mechanism |
| * than a standard ObjectAnimator object.</p> |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines the |
| * animation whose animator is being set. |
| * @param animator The animation being assigned. A value of <code>null</code> means that no |
| * animation will be run for the specified transitionType. |
| */ |
| public void setAnimator(int transitionType, Animator animator) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| mChangingAppearingAnim = animator; |
| break; |
| case CHANGE_DISAPPEARING: |
| mChangingDisappearingAnim = animator; |
| break; |
| case CHANGING: |
| mChangingAnim = animator; |
| break; |
| case APPEARING: |
| mAppearingAnim = animator; |
| break; |
| case DISAPPEARING: |
| mDisappearingAnim = animator; |
| break; |
| } |
| } |
| |
| /** |
| * Gets the animation used during one of the transition types that may run. |
| * |
| * @param transitionType One of {@link #CHANGE_APPEARING}, {@link #CHANGE_DISAPPEARING}, |
| * {@link #CHANGING}, {@link #APPEARING}, or {@link #DISAPPEARING}, which determines |
| * the animation whose animator is being returned. |
| * @return Animator The animation being used for the given transition type. |
| * @see #setAnimator(int, Animator) |
| */ |
| public Animator getAnimator(int transitionType) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| return mChangingAppearingAnim; |
| case CHANGE_DISAPPEARING: |
| return mChangingDisappearingAnim; |
| case CHANGING: |
| return mChangingAnim; |
| case APPEARING: |
| return mAppearingAnim; |
| case DISAPPEARING: |
| return mDisappearingAnim; |
| } |
| // shouldn't reach here |
| return null; |
| } |
| |
| /** |
| * This function sets up animations on all of the views that change during layout. |
| * For every child in the parent, we create a change animation of the appropriate |
| * type (appearing, disappearing, or changing) and ask it to populate its start values from its |
| * target view. We add layout listeners to all child views and listen for changes. For |
| * those views that change, we populate the end values for those animations and start them. |
| * Animations are not run on unchanging views. |
| * |
| * @param parent The container which is undergoing a change. |
| * @param newView The view being added to or removed from the parent. May be null if the |
| * changeReason is CHANGING. |
| * @param changeReason A value of APPEARING, DISAPPEARING, or CHANGING, indicating whether the |
| * transition is occurring because an item is being added to or removed from the parent, or |
| * if it is running in response to a layout operation (that is, if the value is CHANGING). |
| */ |
| private void runChangeTransition(final ViewGroup parent, View newView, final int changeReason) { |
| |
| Animator baseAnimator = null; |
| Animator parentAnimator = null; |
| final long duration; |
| switch (changeReason) { |
| case APPEARING: |
| baseAnimator = mChangingAppearingAnim; |
| duration = mChangingAppearingDuration; |
| parentAnimator = defaultChangeIn; |
| break; |
| case DISAPPEARING: |
| baseAnimator = mChangingDisappearingAnim; |
| duration = mChangingDisappearingDuration; |
| parentAnimator = defaultChangeOut; |
| break; |
| case CHANGING: |
| baseAnimator = mChangingAnim; |
| duration = mChangingDuration; |
| parentAnimator = defaultChange; |
| break; |
| default: |
| // Shouldn't reach here |
| duration = 0; |
| break; |
| } |
| // If the animation is null, there's nothing to do |
| if (baseAnimator == null) { |
| return; |
| } |
| |
| // reset the inter-animation delay, in case we use it later |
| staggerDelay = 0; |
| |
| final ViewTreeObserver observer = parent.getViewTreeObserver(); |
| if (!observer.isAlive()) { |
| // If the observer's not in a good state, skip the transition |
| return; |
| } |
| int numChildren = parent.getChildCount(); |
| |
| for (int i = 0; i < numChildren; ++i) { |
| final View child = parent.getChildAt(i); |
| |
| // only animate the views not being added or removed |
| if (child != newView) { |
| setupChangeAnimation(parent, changeReason, baseAnimator, duration, child); |
| } |
| } |
| if (mAnimateParentHierarchy) { |
| ViewGroup tempParent = parent; |
| while (tempParent != null) { |
| ViewParent parentParent = tempParent.getParent(); |
| if (parentParent instanceof ViewGroup) { |
| setupChangeAnimation((ViewGroup)parentParent, changeReason, parentAnimator, |
| duration, tempParent); |
| tempParent = (ViewGroup) parentParent; |
| } else { |
| tempParent = null; |
| } |
| |
| } |
| } |
| |
| // This is the cleanup step. When we get this rendering event, we know that all of |
| // the appropriate animations have been set up and run. Now we can clear out the |
| // layout listeners. |
| CleanupCallback callback = new CleanupCallback(layoutChangeListenerMap, parent); |
| observer.addOnPreDrawListener(callback); |
| parent.addOnAttachStateChangeListener(callback); |
| } |
| |
| /** |
| * This flag controls whether CHANGE_APPEARING or CHANGE_DISAPPEARING animations will |
| * cause the default changing animation to be run on the parent hierarchy as well. This allows |
| * containers of transitioning views to also transition, which may be necessary in situations |
| * where the containers bounds change between the before/after states and may clip their |
| * children during the transition animations. For example, layouts with wrap_content will |
| * adjust their bounds according to the dimensions of their children. |
| * |
| * <p>The default changing transitions animate the bounds and scroll positions of the |
| * target views. These are the animations that will run on the parent hierarchy, not |
| * the custom animations that happen to be set on the transition. This allows custom |
| * behavior for the children of the transitioning container, but uses standard behavior |
| * of resizing/rescrolling on any changing parents. |
| * |
| * @param animateParentHierarchy A boolean value indicating whether the parents of |
| * transitioning views should also be animated during the transition. Default value is true. |
| */ |
| public void setAnimateParentHierarchy(boolean animateParentHierarchy) { |
| mAnimateParentHierarchy = animateParentHierarchy; |
| } |
| |
| /** |
| * Utility function called by runChangingTransition for both the children and the parent |
| * hierarchy. |
| */ |
| private void setupChangeAnimation(final ViewGroup parent, final int changeReason, |
| Animator baseAnimator, final long duration, final View child) { |
| |
| // If we already have a listener for this child, then we've already set up the |
| // changing animation we need. Multiple calls for a child may occur when several |
| // add/remove operations are run at once on a container; each one will trigger |
| // changes for the existing children in the container. |
| if (layoutChangeListenerMap.get(child) != null) { |
| return; |
| } |
| |
| // Don't animate items up from size(0,0); this is likely because the objects |
| // were offscreen/invisible or otherwise measured to be infinitely small. We don't |
| // want to see them animate into their real size; just ignore animation requests |
| // on these views |
| if (child.getWidth() == 0 && child.getHeight() == 0) { |
| return; |
| } |
| |
| // Make a copy of the appropriate animation |
| final Animator anim = baseAnimator.clone(); |
| |
| // Set the target object for the animation |
| anim.setTarget(child); |
| |
| // A ObjectAnimator (or AnimatorSet of them) can extract start values from |
| // its target object |
| anim.setupStartValues(); |
| |
| // If there's an animation running on this view already, cancel it |
| Animator currentAnimation = pendingAnimations.get(child); |
| if (currentAnimation != null) { |
| currentAnimation.cancel(); |
| pendingAnimations.remove(child); |
| } |
| // Cache the animation in case we need to cancel it later |
| pendingAnimations.put(child, anim); |
| |
| // For the animations which don't get started, we have to have a means of |
| // removing them from the cache, lest we leak them and their target objects. |
| // We run an animator for the default duration+100 (an arbitrary time, but one |
| // which should far surpass the delay between setting them up here and |
| // handling layout events which start them. |
| ValueAnimator pendingAnimRemover = ValueAnimator.ofFloat(0f, 1f). |
| setDuration(duration + 100); |
| pendingAnimRemover.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| pendingAnimations.remove(child); |
| } |
| }); |
| pendingAnimRemover.start(); |
| |
| // Add a listener to track layout changes on this view. If we don't get a callback, |
| // then there's nothing to animate. |
| final View.OnLayoutChangeListener listener = new View.OnLayoutChangeListener() { |
| public void onLayoutChange(View v, int left, int top, int right, int bottom, |
| int oldLeft, int oldTop, int oldRight, int oldBottom) { |
| |
| // Tell the animation to extract end values from the changed object |
| anim.setupEndValues(); |
| if (anim instanceof ValueAnimator) { |
| boolean valuesDiffer = false; |
| ValueAnimator valueAnim = (ValueAnimator)anim; |
| PropertyValuesHolder[] oldValues = valueAnim.getValues(); |
| for (int i = 0; i < oldValues.length; ++i) { |
| PropertyValuesHolder pvh = oldValues[i]; |
| if (pvh.mKeyframes instanceof KeyframeSet) { |
| KeyframeSet keyframeSet = (KeyframeSet) pvh.mKeyframes; |
| if (keyframeSet.mFirstKeyframe == null || |
| keyframeSet.mLastKeyframe == null || |
| !keyframeSet.mFirstKeyframe.getValue().equals( |
| keyframeSet.mLastKeyframe.getValue())) { |
| valuesDiffer = true; |
| } |
| } else if (!pvh.mKeyframes.getValue(0).equals(pvh.mKeyframes.getValue(1))) { |
| valuesDiffer = true; |
| } |
| } |
| if (!valuesDiffer) { |
| return; |
| } |
| } |
| |
| long startDelay = 0; |
| switch (changeReason) { |
| case APPEARING: |
| startDelay = mChangingAppearingDelay + staggerDelay; |
| staggerDelay += mChangingAppearingStagger; |
| if (mChangingAppearingInterpolator != sChangingAppearingInterpolator) { |
| anim.setInterpolator(mChangingAppearingInterpolator); |
| } |
| break; |
| case DISAPPEARING: |
| startDelay = mChangingDisappearingDelay + staggerDelay; |
| staggerDelay += mChangingDisappearingStagger; |
| if (mChangingDisappearingInterpolator != |
| sChangingDisappearingInterpolator) { |
| anim.setInterpolator(mChangingDisappearingInterpolator); |
| } |
| break; |
| case CHANGING: |
| startDelay = mChangingDelay + staggerDelay; |
| staggerDelay += mChangingStagger; |
| if (mChangingInterpolator != sChangingInterpolator) { |
| anim.setInterpolator(mChangingInterpolator); |
| } |
| break; |
| } |
| anim.setStartDelay(startDelay); |
| anim.setDuration(duration); |
| |
| Animator prevAnimation = currentChangingAnimations.get(child); |
| if (prevAnimation != null) { |
| prevAnimation.cancel(); |
| } |
| Animator pendingAnimation = pendingAnimations.get(child); |
| if (pendingAnimation != null) { |
| pendingAnimations.remove(child); |
| } |
| // Cache the animation in case we need to cancel it later |
| currentChangingAnimations.put(child, anim); |
| |
| parent.requestTransitionStart(LayoutTransition.this); |
| |
| // this only removes listeners whose views changed - must clear the |
| // other listeners later |
| child.removeOnLayoutChangeListener(this); |
| layoutChangeListenerMap.remove(child); |
| } |
| }; |
| // Remove the animation from the cache when it ends |
| anim.addListener(new AnimatorListenerAdapter() { |
| |
| @Override |
| public void onAnimationStart(Animator animator) { |
| if (hasListeners()) { |
| ArrayList<TransitionListener> listeners = |
| (ArrayList<TransitionListener>) mListeners.clone(); |
| for (TransitionListener listener : listeners) { |
| listener.startTransition(LayoutTransition.this, parent, child, |
| changeReason == APPEARING ? |
| CHANGE_APPEARING : changeReason == DISAPPEARING ? |
| CHANGE_DISAPPEARING : CHANGING); |
| } |
| } |
| } |
| |
| @Override |
| public void onAnimationCancel(Animator animator) { |
| child.removeOnLayoutChangeListener(listener); |
| layoutChangeListenerMap.remove(child); |
| } |
| |
| @Override |
| public void onAnimationEnd(Animator animator) { |
| currentChangingAnimations.remove(child); |
| if (hasListeners()) { |
| ArrayList<TransitionListener> listeners = |
| (ArrayList<TransitionListener>) mListeners.clone(); |
| for (TransitionListener listener : listeners) { |
| listener.endTransition(LayoutTransition.this, parent, child, |
| changeReason == APPEARING ? |
| CHANGE_APPEARING : changeReason == DISAPPEARING ? |
| CHANGE_DISAPPEARING : CHANGING); |
| } |
| } |
| } |
| }); |
| |
| child.addOnLayoutChangeListener(listener); |
| // cache the listener for later removal |
| layoutChangeListenerMap.put(child, listener); |
| } |
| |
| /** |
| * Starts the animations set up for a CHANGING transition. We separate the setup of these |
| * animations from actually starting them, to avoid side-effects that starting the animations |
| * may have on the properties of the affected objects. After setup, we tell the affected parent |
| * that this transition should be started. The parent informs its ViewAncestor, which then |
| * starts the transition after the current layout/measurement phase, just prior to drawing |
| * the view hierarchy. |
| * |
| * @hide |
| */ |
| public void startChangingAnimations() { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentChangingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| if (anim instanceof ObjectAnimator) { |
| ((ObjectAnimator) anim).setCurrentPlayTime(0); |
| } |
| anim.start(); |
| } |
| } |
| |
| /** |
| * Ends the animations that are set up for a CHANGING transition. This is a variant of |
| * startChangingAnimations() which is called when the window the transition is playing in |
| * is not visible. We need to make sure the animations put their targets in their end states |
| * and that the transition finishes to remove any mid-process state (such as isRunning()). |
| * |
| * @hide |
| */ |
| public void endChangingAnimations() { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentChangingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| anim.start(); |
| anim.end(); |
| } |
| // listeners should clean up the currentChangingAnimations list, but just in case... |
| currentChangingAnimations.clear(); |
| } |
| |
| /** |
| * Returns true if animations are running which animate layout-related properties. This |
| * essentially means that either CHANGE_APPEARING or CHANGE_DISAPPEARING animations |
| * are running, since these animations operate on layout-related properties. |
| * |
| * @return true if CHANGE_APPEARING or CHANGE_DISAPPEARING animations are currently |
| * running. |
| */ |
| public boolean isChangingLayout() { |
| return (currentChangingAnimations.size() > 0); |
| } |
| |
| /** |
| * Returns true if any of the animations in this transition are currently running. |
| * |
| * @return true if any animations in the transition are running. |
| */ |
| public boolean isRunning() { |
| return (currentChangingAnimations.size() > 0 || currentAppearingAnimations.size() > 0 || |
| currentDisappearingAnimations.size() > 0); |
| } |
| |
| /** |
| * Cancels the currently running transition. Note that we cancel() the changing animations |
| * but end() the visibility animations. This is because this method is currently called |
| * in the context of starting a new transition, so we want to move things from their mid- |
| * transition positions, but we want them to have their end-transition visibility. |
| * |
| * @hide |
| */ |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P) |
| public void cancel() { |
| if (currentChangingAnimations.size() > 0) { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentChangingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| anim.cancel(); |
| } |
| currentChangingAnimations.clear(); |
| } |
| if (currentAppearingAnimations.size() > 0) { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentAppearingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| anim.end(); |
| } |
| currentAppearingAnimations.clear(); |
| } |
| if (currentDisappearingAnimations.size() > 0) { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentDisappearingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| anim.end(); |
| } |
| currentDisappearingAnimations.clear(); |
| } |
| } |
| |
| /** |
| * Cancels the specified type of transition. Note that we cancel() the changing animations |
| * but end() the visibility animations. This is because this method is currently called |
| * in the context of starting a new transition, so we want to move things from their mid- |
| * transition positions, but we want them to have their end-transition visibility. |
| * |
| * @hide |
| */ |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P) |
| public void cancel(int transitionType) { |
| switch (transitionType) { |
| case CHANGE_APPEARING: |
| case CHANGE_DISAPPEARING: |
| case CHANGING: |
| if (currentChangingAnimations.size() > 0) { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentChangingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| anim.cancel(); |
| } |
| currentChangingAnimations.clear(); |
| } |
| break; |
| case APPEARING: |
| if (currentAppearingAnimations.size() > 0) { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentAppearingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| anim.end(); |
| } |
| currentAppearingAnimations.clear(); |
| } |
| break; |
| case DISAPPEARING: |
| if (currentDisappearingAnimations.size() > 0) { |
| LinkedHashMap<View, Animator> currentAnimCopy = |
| (LinkedHashMap<View, Animator>) currentDisappearingAnimations.clone(); |
| for (Animator anim : currentAnimCopy.values()) { |
| anim.end(); |
| } |
| currentDisappearingAnimations.clear(); |
| } |
| break; |
| } |
| } |
| |
| /** |
| * This method runs the animation that makes an added item appear. |
| * |
| * @param parent The ViewGroup to which the View is being added. |
| * @param child The View being added to the ViewGroup. |
| */ |
| private void runAppearingTransition(final ViewGroup parent, final View child) { |
| Animator currentAnimation = currentDisappearingAnimations.get(child); |
| if (currentAnimation != null) { |
| currentAnimation.cancel(); |
| } |
| if (mAppearingAnim == null) { |
| if (hasListeners()) { |
| ArrayList<TransitionListener> listeners = |
| (ArrayList<TransitionListener>) mListeners.clone(); |
| for (TransitionListener listener : listeners) { |
| listener.endTransition(LayoutTransition.this, parent, child, APPEARING); |
| } |
| } |
| return; |
| } |
| Animator anim = mAppearingAnim.clone(); |
| anim.setTarget(child); |
| anim.setStartDelay(mAppearingDelay); |
| anim.setDuration(mAppearingDuration); |
| if (mAppearingInterpolator != sAppearingInterpolator) { |
| anim.setInterpolator(mAppearingInterpolator); |
| } |
| if (anim instanceof ObjectAnimator) { |
| ((ObjectAnimator) anim).setCurrentPlayTime(0); |
| } |
| anim.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator anim) { |
| currentAppearingAnimations.remove(child); |
| if (hasListeners()) { |
| ArrayList<TransitionListener> listeners = |
| (ArrayList<TransitionListener>) mListeners.clone(); |
| for (TransitionListener listener : listeners) { |
| listener.endTransition(LayoutTransition.this, parent, child, APPEARING); |
| } |
| } |
| } |
| }); |
| currentAppearingAnimations.put(child, anim); |
| anim.start(); |
| } |
| |
| /** |
| * This method runs the animation that makes a removed item disappear. |
| * |
| * @param parent The ViewGroup from which the View is being removed. |
| * @param child The View being removed from the ViewGroup. |
| */ |
| private void runDisappearingTransition(final ViewGroup parent, final View child) { |
| Animator currentAnimation = currentAppearingAnimations.get(child); |
| if (currentAnimation != null) { |
| currentAnimation.cancel(); |
| } |
| if (mDisappearingAnim == null) { |
| if (hasListeners()) { |
| ArrayList<TransitionListener> listeners = |
| (ArrayList<TransitionListener>) mListeners.clone(); |
| for (TransitionListener listener : listeners) { |
| listener.endTransition(LayoutTransition.this, parent, child, DISAPPEARING); |
| } |
| } |
| return; |
| } |
| Animator anim = mDisappearingAnim.clone(); |
| anim.setStartDelay(mDisappearingDelay); |
| anim.setDuration(mDisappearingDuration); |
| if (mDisappearingInterpolator != sDisappearingInterpolator) { |
| anim.setInterpolator(mDisappearingInterpolator); |
| } |
| anim.setTarget(child); |
| final float preAnimAlpha = child.getAlpha(); |
| anim.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator anim) { |
| currentDisappearingAnimations.remove(child); |
| child.setAlpha(preAnimAlpha); |
| if (hasListeners()) { |
| ArrayList<TransitionListener> listeners = |
| (ArrayList<TransitionListener>) mListeners.clone(); |
| for (TransitionListener listener : listeners) { |
| listener.endTransition(LayoutTransition.this, parent, child, DISAPPEARING); |
| } |
| } |
| } |
| }); |
| if (anim instanceof ObjectAnimator) { |
| ((ObjectAnimator) anim).setCurrentPlayTime(0); |
| } |
| currentDisappearingAnimations.put(child, anim); |
| anim.start(); |
| } |
| |
| /** |
| * This method is called by ViewGroup when a child view is about to be added to the |
| * container. This callback starts the process of a transition; we grab the starting |
| * values, listen for changes to all of the children of the container, and start appropriate |
| * animations. |
| * |
| * @param parent The ViewGroup to which the View is being added. |
| * @param child The View being added to the ViewGroup. |
| * @param changesLayout Whether the removal will cause changes in the layout of other views |
| * in the container. INVISIBLE views becoming VISIBLE will not cause changes and thus will not |
| * affect CHANGE_APPEARING or CHANGE_DISAPPEARING animations. |
| */ |
| private void addChild(ViewGroup parent, View child, boolean changesLayout) { |
| if (parent.getWindowVisibility() != View.VISIBLE) { |
| return; |
| } |
| if ((mTransitionTypes & FLAG_APPEARING) == FLAG_APPEARING) { |
| // Want disappearing animations to finish up before proceeding |
| cancel(DISAPPEARING); |
| } |
| if (changesLayout && (mTransitionTypes & FLAG_CHANGE_APPEARING) == FLAG_CHANGE_APPEARING) { |
| // Also, cancel changing animations so that we start fresh ones from current locations |
| cancel(CHANGE_APPEARING); |
| cancel(CHANGING); |
| } |
| if (hasListeners() && (mTransitionTypes & FLAG_APPEARING) == FLAG_APPEARING) { |
| ArrayList<TransitionListener> listeners = |
| (ArrayList<TransitionListener>) mListeners.clone(); |
| for (TransitionListener listener : listeners) { |
| listener.startTransition(this, parent, child, APPEARING); |
| } |
| } |
| if (changesLayout && (mTransitionTypes & FLAG_CHANGE_APPEARING) == FLAG_CHANGE_APPEARING) { |
| runChangeTransition(parent, child, APPEARING); |
| } |
| if ((mTransitionTypes & FLAG_APPEARING) == FLAG_APPEARING) { |
| runAppearingTransition(parent, child); |
| } |
| } |
| |
| private boolean hasListeners() { |
| return mListeners != null && mListeners.size() > 0; |
| } |
| |
| /** |
| * This method is called by ViewGroup when there is a call to layout() on the container |
| * with this LayoutTransition. If the CHANGING transition is enabled and if there is no other |
| * transition currently running on the container, then this call runs a CHANGING transition. |
| * The transition does not start immediately; it just sets up the mechanism to run if any |
| * of the children of the container change their layout parameters (similar to |
| * the CHANGE_APPEARING and CHANGE_DISAPPEARING transitions). |
| * |
| * @param parent The ViewGroup whose layout() method has been called. |
| * |
| * @hide |
| */ |
| public void layoutChange(ViewGroup parent) { |
| if (parent.getWindowVisibility() != View.VISIBLE) { |
| return; |
| } |
| if ((mTransitionTypes & FLAG_CHANGING) == FLAG_CHANGING && !isRunning()) { |
| // This method is called for all calls to layout() in the container, including |
| // those caused by add/remove/hide/show events, which will already have set up |
| // transition animations. Avoid setting up CHANGING animations in this case; only |
| // do so when there is not a transition already running on the container. |
| runChangeTransition(parent, null, CHANGING); |
| } |
| } |
| |
| /** |
| * This method is called by ViewGroup when a child view is about to be added to the |
| * container. This callback starts the process of a transition; we grab the starting |
| * values, listen for changes to all of the children of the container, and start appropriate |
| * animations. |
| * |
| * @param parent The ViewGroup to which the View is being added. |
| * @param child The View being added to the ViewGroup. |
| */ |
| public void addChild(ViewGroup parent, View child) { |
| addChild(parent, child, true); |
| } |
| |
| /** |
| * @deprecated Use {@link #showChild(android.view.ViewGroup, android.view.View, int)}. |
| */ |
| @Deprecated |
| public void showChild(ViewGroup parent, View child) { |
| addChild(parent, child, true); |
| } |
| |
| /** |
| * This method is called by ViewGroup when a child view is about to be made visible in the |
| * container. This callback starts the process of a transition; we grab the starting |
| * values, listen for changes to all of the children of the container, and start appropriate |
| * animations. |
| * |
| * @param parent The ViewGroup in which the View is being made visible. |
| * @param child The View being made visible. |
| * @param oldVisibility The previous visibility value of the child View, either |
| * {@link View#GONE} or {@link View#INVISIBLE}. |
| */ |
| public void showChild(ViewGroup parent, View child, int oldVisibility) { |
| addChild(parent, child, oldVisibility == View.GONE); |
| } |
| |
| /** |
| * This method is called by ViewGroup when a child view is about to be removed from the |
| * container. This callback starts the process of a transition; we grab the starting |
| * values, listen for changes to all of the children of the container, and start appropriate |
| * animations. |
| * |
| * @param parent The ViewGroup from which the View is being removed. |
| * @param child The View being removed from the ViewGroup. |
| * @param changesLayout Whether the removal will cause changes in the layout of other views |
| * in the container. Views becoming INVISIBLE will not cause changes and thus will not |
| * affect CHANGE_APPEARING or CHANGE_DISAPPEARING animations. |
| */ |
| private void removeChild(ViewGroup parent, View child, boolean changesLayout) { |
| if (parent.getWindowVisibility() != View.VISIBLE) { |
| return; |
| } |
| if ((mTransitionTypes & FLAG_DISAPPEARING) == FLAG_DISAPPEARING) { |
| // Want appearing animations to finish up before proceeding |
| cancel(APPEARING); |
| } |
| if (changesLayout && |
| (mTransitionTypes & FLAG_CHANGE_DISAPPEARING) == FLAG_CHANGE_DISAPPEARING) { |
| // Also, cancel changing animations so that we start fresh ones from current locations |
| cancel(CHANGE_DISAPPEARING); |
| cancel(CHANGING); |
| } |
| if (hasListeners() && (mTransitionTypes & FLAG_DISAPPEARING) == FLAG_DISAPPEARING) { |
| ArrayList<TransitionListener> listeners = (ArrayList<TransitionListener>) mListeners |
| .clone(); |
| for (TransitionListener listener : listeners) { |
| listener.startTransition(this, parent, child, DISAPPEARING); |
| } |
| } |
| if (changesLayout && |
| (mTransitionTypes & FLAG_CHANGE_DISAPPEARING) == FLAG_CHANGE_DISAPPEARING) { |
| runChangeTransition(parent, child, DISAPPEARING); |
| } |
| if ((mTransitionTypes & FLAG_DISAPPEARING) == FLAG_DISAPPEARING) { |
| runDisappearingTransition(parent, child); |
| } |
| } |
| |
| /** |
| * This method is called by ViewGroup when a child view is about to be removed from the |
| * container. This callback starts the process of a transition; we grab the starting |
| * values, listen for changes to all of the children of the container, and start appropriate |
| * animations. |
| * |
| * @param parent The ViewGroup from which the View is being removed. |
| * @param child The View being removed from the ViewGroup. |
| */ |
| public void removeChild(ViewGroup parent, View child) { |
| removeChild(parent, child, true); |
| } |
| |
| /** |
| * @deprecated Use {@link #hideChild(android.view.ViewGroup, android.view.View, int)}. |
| */ |
| @Deprecated |
| public void hideChild(ViewGroup parent, View child) { |
| removeChild(parent, child, true); |
| } |
| |
| /** |
| * This method is called by ViewGroup when a child view is about to be hidden in |
| * container. This callback starts the process of a transition; we grab the starting |
| * values, listen for changes to all of the children of the container, and start appropriate |
| * animations. |
| * |
| * @param parent The parent ViewGroup of the View being hidden. |
| * @param child The View being hidden. |
| * @param newVisibility The new visibility value of the child View, either |
| * {@link View#GONE} or {@link View#INVISIBLE}. |
| */ |
| public void hideChild(ViewGroup parent, View child, int newVisibility) { |
| removeChild(parent, child, newVisibility == View.GONE); |
| } |
| |
| /** |
| * Add a listener that will be called when the bounds of the view change due to |
| * layout processing. |
| * |
| * @param listener The listener that will be called when layout bounds change. |
| */ |
| public void addTransitionListener(TransitionListener listener) { |
| if (mListeners == null) { |
| mListeners = new ArrayList<TransitionListener>(); |
| } |
| mListeners.add(listener); |
| } |
| |
| /** |
| * Remove a listener for layout changes. |
| * |
| * @param listener The listener for layout bounds change. |
| */ |
| public void removeTransitionListener(TransitionListener listener) { |
| if (mListeners == null) { |
| return; |
| } |
| mListeners.remove(listener); |
| } |
| |
| /** |
| * Gets the current list of listeners for layout changes. |
| * @return |
| */ |
| public List<TransitionListener> getTransitionListeners() { |
| return mListeners; |
| } |
| |
| /** |
| * This interface is used for listening to starting and ending events for transitions. |
| */ |
| public interface TransitionListener { |
| |
| /** |
| * This event is sent to listeners when any type of transition animation begins. |
| * |
| * @param transition The LayoutTransition sending out the event. |
| * @param container The ViewGroup on which the transition is playing. |
| * @param view The View object being affected by the transition animation. |
| * @param transitionType The type of transition that is beginning, |
| * {@link android.animation.LayoutTransition#APPEARING}, |
| * {@link android.animation.LayoutTransition#DISAPPEARING}, |
| * {@link android.animation.LayoutTransition#CHANGE_APPEARING}, or |
| * {@link android.animation.LayoutTransition#CHANGE_DISAPPEARING}. |
| */ |
| public void startTransition(LayoutTransition transition, ViewGroup container, |
| View view, int transitionType); |
| |
| /** |
| * This event is sent to listeners when any type of transition animation ends. |
| * |
| * @param transition The LayoutTransition sending out the event. |
| * @param container The ViewGroup on which the transition is playing. |
| * @param view The View object being affected by the transition animation. |
| * @param transitionType The type of transition that is ending, |
| * {@link android.animation.LayoutTransition#APPEARING}, |
| * {@link android.animation.LayoutTransition#DISAPPEARING}, |
| * {@link android.animation.LayoutTransition#CHANGE_APPEARING}, or |
| * {@link android.animation.LayoutTransition#CHANGE_DISAPPEARING}. |
| */ |
| public void endTransition(LayoutTransition transition, ViewGroup container, |
| View view, int transitionType); |
| } |
| |
| /** |
| * Utility class to clean up listeners after animations are setup. Cleanup happens |
| * when either the OnPreDrawListener method is called or when the parent is detached, |
| * whichever comes first. |
| */ |
| private static final class CleanupCallback implements ViewTreeObserver.OnPreDrawListener, |
| View.OnAttachStateChangeListener { |
| |
| final Map<View, View.OnLayoutChangeListener> layoutChangeListenerMap; |
| final ViewGroup parent; |
| |
| CleanupCallback(Map<View, View.OnLayoutChangeListener> listenerMap, ViewGroup parent) { |
| this.layoutChangeListenerMap = listenerMap; |
| this.parent = parent; |
| } |
| |
| private void cleanup() { |
| parent.getViewTreeObserver().removeOnPreDrawListener(this); |
| parent.removeOnAttachStateChangeListener(this); |
| int count = layoutChangeListenerMap.size(); |
| if (count > 0) { |
| Collection<View> views = layoutChangeListenerMap.keySet(); |
| for (View view : views) { |
| View.OnLayoutChangeListener listener = layoutChangeListenerMap.get(view); |
| view.removeOnLayoutChangeListener(listener); |
| } |
| layoutChangeListenerMap.clear(); |
| } |
| } |
| |
| @Override |
| public void onViewAttachedToWindow(View v) { |
| } |
| |
| @Override |
| public void onViewDetachedFromWindow(View v) { |
| cleanup(); |
| } |
| |
| @Override |
| public boolean onPreDraw() { |
| cleanup(); |
| return true; |
| } |
| }; |
| |
| } |
