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/*
* Copyright (C) 2011 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 com.nineoldandroids.view;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Set;
import android.view.View;
import android.view.animation.Interpolator;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.ValueAnimator;
class ViewPropertyAnimatorHC extends ViewPropertyAnimator {
/**
* A WeakReference holding the View whose properties are being animated by this class.
* This is set at construction time.
*/
private final WeakReference mView;
/**
* The duration of the underlying Animator object. By default, we don't set the duration
* on the Animator and just use its default duration. If the duration is ever set on this
* Animator, then we use the duration that it was set to.
*/
private long mDuration;
/**
* A flag indicating whether the duration has been set on this object. If not, we don't set
* the duration on the underlying Animator, but instead just use its default duration.
*/
private boolean mDurationSet = false;
/**
* The startDelay of the underlying Animator object. By default, we don't set the startDelay
* on the Animator and just use its default startDelay. If the startDelay is ever set on this
* Animator, then we use the startDelay that it was set to.
*/
private long mStartDelay = 0;
/**
* A flag indicating whether the startDelay has been set on this object. If not, we don't set
* the startDelay on the underlying Animator, but instead just use its default startDelay.
*/
private boolean mStartDelaySet = false;
/**
* The interpolator of the underlying Animator object. By default, we don't set the interpolator
* on the Animator and just use its default interpolator. If the interpolator is ever set on
* this Animator, then we use the interpolator that it was set to.
*/
private /*Time*/Interpolator mInterpolator;
/**
* A flag indicating whether the interpolator has been set on this object. If not, we don't set
* the interpolator on the underlying Animator, but instead just use its default interpolator.
*/
private boolean mInterpolatorSet = false;
/**
* Listener for the lifecycle events of the underlying
*/
private Animator.AnimatorListener mListener = null;
/**
* This listener is the mechanism by which the underlying Animator causes changes to the
* properties currently being animated, as well as the cleanup after an animation is
* complete.
*/
private AnimatorEventListener mAnimatorEventListener = new AnimatorEventListener();
/**
* This list holds the properties that have been asked to animate. We allow the caller to
* request several animations prior to actually starting the underlying animator. This
* enables us to run one single animator to handle several properties in parallel. Each
* property is tossed onto the pending list until the animation actually starts (which is
* done by posting it onto mView), at which time the pending list is cleared and the properties
* on that list are added to the list of properties associated with that animator.
*/
ArrayList mPendingAnimations = new ArrayList();
/**
* Constants used to associate a property being requested and the mechanism used to set
* the property (this class calls directly into View to set the properties in question).
*/
private static final int NONE = 0x0000;
private static final int TRANSLATION_X = 0x0001;
private static final int TRANSLATION_Y = 0x0002;
private static final int SCALE_X = 0x0004;
private static final int SCALE_Y = 0x0008;
private static final int ROTATION = 0x0010;
private static final int ROTATION_X = 0x0020;
private static final int ROTATION_Y = 0x0040;
private static final int X = 0x0080;
private static final int Y = 0x0100;
private static final int ALPHA = 0x0200;
private static final int TRANSFORM_MASK = TRANSLATION_X | TRANSLATION_Y | SCALE_X | SCALE_Y |
ROTATION | ROTATION_X | ROTATION_Y | X | Y;
/**
* The mechanism by which the user can request several properties that are then animated
* together works by posting this Runnable to start the underlying Animator. Every time
* a property animation is requested, we cancel any previous postings of the Runnable
* and re-post it. This means that we will only ever run the Runnable (and thus start the
* underlying animator) after the caller is done setting the properties that should be
* animated together.
*/
private Runnable mAnimationStarter = new Runnable() {
@Override
public void run() {
startAnimation();
}
};
/**
* This class holds information about the overall animation being run on the set of
* properties. The mask describes which properties are being animated and the
* values holder is the list of all property/value objects.
*/
private static class PropertyBundle {
int mPropertyMask;
ArrayList mNameValuesHolder;
PropertyBundle(int propertyMask, ArrayList nameValuesHolder) {
mPropertyMask = propertyMask;
mNameValuesHolder = nameValuesHolder;
}
/**
* Removes the given property from being animated as a part of this
* PropertyBundle. If the property was a part of this bundle, it returns
* true to indicate that it was, in fact, canceled. This is an indication
* to the caller that a cancellation actually occurred.
*
* @param propertyConstant The property whose cancellation is requested.
* @return true if the given property is a part of this bundle and if it
* has therefore been canceled.
*/
boolean cancel(int propertyConstant) {
if ((mPropertyMask & propertyConstant) != 0 && mNameValuesHolder != null) {
int count = mNameValuesHolder.size();
for (int i = 0; i < count; ++i) {
NameValuesHolder nameValuesHolder = mNameValuesHolder.get(i);
if (nameValuesHolder.mNameConstant == propertyConstant) {
mNameValuesHolder.remove(i);
mPropertyMask &= ~propertyConstant;
return true;
}
}
}
return false;
}
}
/**
* This list tracks the list of properties being animated by any particular animator.
* In most situations, there would only ever be one animator running at a time. But it is
* possible to request some properties to animate together, then while those properties
* are animating, to request some other properties to animate together. The way that
* works is by having this map associate the group of properties being animated with the
* animator handling the animation. On every update event for an Animator, we ask the
* map for the associated properties and set them accordingly.
*/
private HashMap mAnimatorMap =
new HashMap();
/**
* This is the information we need to set each property during the animation.
* mNameConstant is used to set the appropriate field in View, and the from/delta
* values are used to calculate the animated value for a given animation fraction
* during the animation.
*/
private static class NameValuesHolder {
int mNameConstant;
float mFromValue;
float mDeltaValue;
NameValuesHolder(int nameConstant, float fromValue, float deltaValue) {
mNameConstant = nameConstant;
mFromValue = fromValue;
mDeltaValue = deltaValue;
}
}
/**
* Constructor, called by View. This is private by design, as the user should only
* get a ViewPropertyAnimator by calling View.animate().
*
* @param view The View associated with this ViewPropertyAnimator
*/
ViewPropertyAnimatorHC(View view) {
mView = new WeakReference(view);
}
/**
* Sets the duration for the underlying animator that animates the requested properties.
* By default, the animator uses the default value for ValueAnimator. Calling this method
* will cause the declared value to be used instead.
* @param duration The length of ensuing property animations, in milliseconds. The value
* cannot be negative.
* @return This object, allowing calls to methods in this class to be chained.
*/
public ViewPropertyAnimator setDuration(long duration) {
if (duration < 0) {
throw new IllegalArgumentException("Animators cannot have negative duration: " +
duration);
}
mDurationSet = true;
mDuration = duration;
return this;
}
/**
* Returns the current duration of property animations. If the duration was set on this
* object, that value is returned. Otherwise, the default value of the underlying Animator
* is returned.
*
* @see #setDuration(long)
* @return The duration of animations, in milliseconds.
*/
public long getDuration() {
if (mDurationSet) {
return mDuration;
} else {
// Just return the default from ValueAnimator, since that's what we'd get if
// the value has not been set otherwise
return new ValueAnimator().getDuration();
}
}
@Override
public long getStartDelay() {
if (mStartDelaySet) {
return mStartDelay;
} else {
// Just return the default from ValueAnimator (0), since that's what we'd get if
// the value has not been set otherwise
return 0;
}
}
@Override
public ViewPropertyAnimator setStartDelay(long startDelay) {
if (startDelay < 0) {
throw new IllegalArgumentException("Animators cannot have negative duration: " +
startDelay);
}
mStartDelaySet = true;
mStartDelay = startDelay;
return this;
}
@Override
public ViewPropertyAnimator setInterpolator(/*Time*/Interpolator interpolator) {
mInterpolatorSet = true;
mInterpolator = interpolator;
return this;
}
@Override
public ViewPropertyAnimator setListener(Animator.AnimatorListener listener) {
mListener = listener;
return this;
}
@Override
public void start() {
startAnimation();
}
@Override
public void cancel() {
if (mAnimatorMap.size() > 0) {
HashMap mAnimatorMapCopy =
(HashMap)mAnimatorMap.clone();
Set animatorSet = mAnimatorMapCopy.keySet();
for (Animator runningAnim : animatorSet) {
runningAnim.cancel();
}
}
mPendingAnimations.clear();
View v = mView.get();
if (v != null) {
v.removeCallbacks(mAnimationStarter);
}
}
@Override
public ViewPropertyAnimator x(float value) {
animateProperty(X, value);
return this;
}
@Override
public ViewPropertyAnimator xBy(float value) {
animatePropertyBy(X, value);
return this;
}
@Override
public ViewPropertyAnimator y(float value) {
animateProperty(Y, value);
return this;
}
@Override
public ViewPropertyAnimator yBy(float value) {
animatePropertyBy(Y, value);
return this;
}
@Override
public ViewPropertyAnimator rotation(float value) {
animateProperty(ROTATION, value);
return this;
}
@Override
public ViewPropertyAnimator rotationBy(float value) {
animatePropertyBy(ROTATION, value);
return this;
}
@Override
public ViewPropertyAnimator rotationX(float value) {
animateProperty(ROTATION_X, value);
return this;
}
@Override
public ViewPropertyAnimator rotationXBy(float value) {
animatePropertyBy(ROTATION_X, value);
return this;
}
@Override
public ViewPropertyAnimator rotationY(float value) {
animateProperty(ROTATION_Y, value);
return this;
}
@Override
public ViewPropertyAnimator rotationYBy(float value) {
animatePropertyBy(ROTATION_Y, value);
return this;
}
@Override
public ViewPropertyAnimator translationX(float value) {
animateProperty(TRANSLATION_X, value);
return this;
}
@Override
public ViewPropertyAnimator translationXBy(float value) {
animatePropertyBy(TRANSLATION_X, value);
return this;
}
@Override
public ViewPropertyAnimator translationY(float value) {
animateProperty(TRANSLATION_Y, value);
return this;
}
@Override
public ViewPropertyAnimator translationYBy(float value) {
animatePropertyBy(TRANSLATION_Y, value);
return this;
}
@Override
public ViewPropertyAnimator scaleX(float value) {
animateProperty(SCALE_X, value);
return this;
}
@Override
public ViewPropertyAnimator scaleXBy(float value) {
animatePropertyBy(SCALE_X, value);
return this;
}
@Override
public ViewPropertyAnimator scaleY(float value) {
animateProperty(SCALE_Y, value);
return this;
}
@Override
public ViewPropertyAnimator scaleYBy(float value) {
animatePropertyBy(SCALE_Y, value);
return this;
}
@Override
public ViewPropertyAnimator alpha(float value) {
animateProperty(ALPHA, value);
return this;
}
@Override
public ViewPropertyAnimator alphaBy(float value) {
animatePropertyBy(ALPHA, value);
return this;
}
/**
* Starts the underlying Animator for a set of properties. We use a single animator that
* simply runs from 0 to 1, and then use that fractional value to set each property
* value accordingly.
*/
private void startAnimation() {
ValueAnimator animator = ValueAnimator.ofFloat(1.0f);
ArrayList nameValueList =
(ArrayList) mPendingAnimations.clone();
mPendingAnimations.clear();
int propertyMask = 0;
int propertyCount = nameValueList.size();
for (int i = 0; i < propertyCount; ++i) {
NameValuesHolder nameValuesHolder = nameValueList.get(i);
propertyMask |= nameValuesHolder.mNameConstant;
}
mAnimatorMap.put(animator, new PropertyBundle(propertyMask, nameValueList));
animator.addUpdateListener(mAnimatorEventListener);
animator.addListener(mAnimatorEventListener);
if (mStartDelaySet) {
animator.setStartDelay(mStartDelay);
}
if (mDurationSet) {
animator.setDuration(mDuration);
}
if (mInterpolatorSet) {
animator.setInterpolator(mInterpolator);
}
animator.start();
}
/**
* Utility function, called by the various x(), y(), etc. methods. This stores the
* constant name for the property along with the from/delta values that will be used to
* calculate and set the property during the animation. This structure is added to the
* pending animations, awaiting the eventual start() of the underlying animator. A
* Runnable is posted to start the animation, and any pending such Runnable is canceled
* (which enables us to end up starting just one animator for all of the properties
* specified at one time).
*
* @param constantName The specifier for the property being animated
* @param toValue The value to which the property will animate
*/
private void animateProperty(int constantName, float toValue) {
float fromValue = getValue(constantName);
float deltaValue = toValue - fromValue;
animatePropertyBy(constantName, fromValue, deltaValue);
}
/**
* Utility function, called by the various xBy(), yBy(), etc. methods. This method is
* just like animateProperty(), except the value is an offset from the property's
* current value, instead of an absolute "to" value.
*
* @param constantName The specifier for the property being animated
* @param byValue The amount by which the property will change
*/
private void animatePropertyBy(int constantName, float byValue) {
float fromValue = getValue(constantName);
animatePropertyBy(constantName, fromValue, byValue);
}
/**
* Utility function, called by animateProperty() and animatePropertyBy(), which handles the
* details of adding a pending animation and posting the request to start the animation.
*
* @param constantName The specifier for the property being animated
* @param startValue The starting value of the property
* @param byValue The amount by which the property will change
*/
private void animatePropertyBy(int constantName, float startValue, float byValue) {
// First, cancel any existing animations on this property
if (mAnimatorMap.size() > 0) {
Animator animatorToCancel = null;
Set animatorSet = mAnimatorMap.keySet();
for (Animator runningAnim : animatorSet) {
PropertyBundle bundle = mAnimatorMap.get(runningAnim);
if (bundle.cancel(constantName)) {
// property was canceled - cancel the animation if it's now empty
// Note that it's safe to break out here because every new animation
// on a property will cancel a previous animation on that property, so
// there can only ever be one such animation running.
if (bundle.mPropertyMask == NONE) {
// the animation is no longer changing anything - cancel it
animatorToCancel = runningAnim;
break;
}
}
}
if (animatorToCancel != null) {
animatorToCancel.cancel();
}
}
NameValuesHolder nameValuePair = new NameValuesHolder(constantName, startValue, byValue);
mPendingAnimations.add(nameValuePair);
View v = mView.get();
if (v != null) {
v.removeCallbacks(mAnimationStarter);
v.post(mAnimationStarter);
}
}
/**
* This method handles setting the property values directly in the View object's fields.
* propertyConstant tells it which property should be set, value is the value to set
* the property to.
*
* @param propertyConstant The property to be set
* @param value The value to set the property to
*/
private void setValue(int propertyConstant, float value) {
//final View.TransformationInfo info = mView.mTransformationInfo;
View v = mView.get();
if (v != null) {
switch (propertyConstant) {
case TRANSLATION_X:
//info.mTranslationX = value;
v.setTranslationX(value);
break;
case TRANSLATION_Y:
//info.mTranslationY = value;
v.setTranslationY(value);
break;
case ROTATION:
//info.mRotation = value;
v.setRotation(value);
break;
case ROTATION_X:
//info.mRotationX = value;
v.setRotationX(value);
break;
case ROTATION_Y:
//info.mRotationY = value;
v.setRotationY(value);
break;
case SCALE_X:
//info.mScaleX = value;
v.setScaleX(value);
break;
case SCALE_Y:
//info.mScaleY = value;
v.setScaleY(value);
break;
case X:
//info.mTranslationX = value - v.mLeft;
v.setX(value);
break;
case Y:
//info.mTranslationY = value - v.mTop;
v.setY(value);
break;
case ALPHA:
//info.mAlpha = value;
v.setAlpha(value);
break;
}
}
}
/**
* This method gets the value of the named property from the View object.
*
* @param propertyConstant The property whose value should be returned
* @return float The value of the named property
*/
private float getValue(int propertyConstant) {
//final View.TransformationInfo info = mView.mTransformationInfo;
View v = mView.get();
if (v != null) {
switch (propertyConstant) {
case TRANSLATION_X:
//return info.mTranslationX;
return v.getTranslationX();
case TRANSLATION_Y:
//return info.mTranslationY;
return v.getTranslationY();
case ROTATION:
//return info.mRotation;
return v.getRotation();
case ROTATION_X:
//return info.mRotationX;
return v.getRotationX();
case ROTATION_Y:
//return info.mRotationY;
return v.getRotationY();
case SCALE_X:
//return info.mScaleX;
return v.getScaleX();
case SCALE_Y:
//return info.mScaleY;
return v.getScaleY();
case X:
//return v.mLeft + info.mTranslationX;
return v.getX();
case Y:
//return v.mTop + info.mTranslationY;
return v.getY();
case ALPHA:
//return info.mAlpha;
return v.getAlpha();
}
}
return 0;
}
/**
* Utility class that handles the various Animator events. The only ones we care
* about are the end event (which we use to clean up the animator map when an animator
* finishes) and the update event (which we use to calculate the current value of each
* property and then set it on the view object).
*/
private class AnimatorEventListener
implements Animator.AnimatorListener, ValueAnimator.AnimatorUpdateListener {
@Override
public void onAnimationStart(Animator animation) {
if (mListener != null) {
mListener.onAnimationStart(animation);
}
}
@Override
public void onAnimationCancel(Animator animation) {
if (mListener != null) {
mListener.onAnimationCancel(animation);
}
}
@Override
public void onAnimationRepeat(Animator animation) {
if (mListener != null) {
mListener.onAnimationRepeat(animation);
}
}
@Override
public void onAnimationEnd(Animator animation) {
if (mListener != null) {
mListener.onAnimationEnd(animation);
}
mAnimatorMap.remove(animation);
// If the map is empty, it means all animation are done or canceled, so the listener
// isn't needed anymore. Not nulling it would cause it to leak any objects used in
// its implementation
if (mAnimatorMap.isEmpty()) {
mListener = null;
}
}
/**
* Calculate the current value for each property and set it on the view. Invalidate
* the view object appropriately, depending on which properties are being animated.
*
* @param animation The animator associated with the properties that need to be
* set. This animator holds the animation fraction which we will use to calculate
* the current value of each property.
*/
@Override
public void onAnimationUpdate(ValueAnimator animation) {
// alpha requires slightly different treatment than the other (transform) properties.
// The logic in setAlpha() is not simply setting mAlpha, plus the invalidation
// logic is dependent on how the view handles an internal call to onSetAlpha().
// We track what kinds of properties are set, and how alpha is handled when it is
// set, and perform the invalidation steps appropriately.
//boolean alphaHandled = false;
//mView.invalidateParentCaches();
float fraction = animation.getAnimatedFraction();
PropertyBundle propertyBundle = mAnimatorMap.get(animation);
int propertyMask = propertyBundle.mPropertyMask;
if ((propertyMask & TRANSFORM_MASK) != 0) {
View v = mView.get();
if (v != null) {
v.invalidate(/*false*/);
}
}
ArrayList valueList = propertyBundle.mNameValuesHolder;
if (valueList != null) {
int count = valueList.size();
for (int i = 0; i < count; ++i) {
NameValuesHolder values = valueList.get(i);
float value = values.mFromValue + fraction * values.mDeltaValue;
//if (values.mNameConstant == ALPHA) {
// alphaHandled = mView.setAlphaNoInvalidation(value);
//} else {
setValue(values.mNameConstant, value);
//}
}
}
/*if ((propertyMask & TRANSFORM_MASK) != 0) {
mView.mTransformationInfo.mMatrixDirty = true;
mView.mPrivateFlags |= View.DRAWN; // force another invalidation
}*/
// invalidate(false) in all cases except if alphaHandled gets set to true
// via the call to setAlphaNoInvalidation(), above
View v = mView.get();
if (v != null) {
v.invalidate(/*alphaHandled*/);
}
}
}
}
