/**
* Constructs and returns a PropertyValuesHolder object with the specified property name and set
* of values. These values can be of any type, but the type should be consistent so that an
* appropriate {@link android.animation.TypeEvaluator} can be found that matches the common type.
*
* <p>If there is only one value, it is assumed to be the end value of an animation, and an
* initial value will be derived, if possible, by calling a getter function on the object. Also,
* if any value is null, the value will be filled in when the animation starts in the same way.
* This mechanism of automatically getting null values only works if the PropertyValuesHolder
* object is used in conjunction {@link ObjectAnimator}, and with a getter function derived
* automatically from <code>propertyName</code>, since otherwise PropertyValuesHolder has no way
* of determining what the value should be.
*
* @param propertyName The name of the property associated with this set of values. This can be
* the actual property name to be used when using a ObjectAnimator object, or just a name used
* to get animated values, such as if this object is used with an ValueAnimator object.
* @param values The set of values to animate between.
*/
public static PropertyValuesHolder ofKeyframe(String propertyName, Keyframe... values) {
KeyframeSet keyframeSet = KeyframeSet.ofKeyframe(values);
if (keyframeSet instanceof IntKeyframeSet) {
return new IntPropertyValuesHolder(propertyName, (IntKeyframeSet) keyframeSet);
} else if (keyframeSet instanceof FloatKeyframeSet) {
return new FloatPropertyValuesHolder(propertyName, (FloatKeyframeSet) keyframeSet);
} else {
PropertyValuesHolder pvh = new PropertyValuesHolder(propertyName);
pvh.mKeyframeSet = keyframeSet;
pvh.mValueType = values[0].getType();
return pvh;
}
}
@Override
public PropertyValuesHolder clone() {
try {
PropertyValuesHolder newPVH = (PropertyValuesHolder) super.clone();
newPVH.mPropertyName = mPropertyName;
// newPVH.mProperty = mProperty;
newPVH.mKeyframeSet = mKeyframeSet.clone();
newPVH.mEvaluator = mEvaluator;
return newPVH;
} catch (CloneNotSupportedException e) {
// won't reach here
return null;
}
}
/**
* Internal function, called by ValueAnimator, to set up the TypeEvaluator that will be used to
* calculate animated values.
*/
void init() {
if (mEvaluator == null) {
// We already handle int and float automatically, but not their Object
// equivalents
mEvaluator =
(mValueType == Integer.class)
? sIntEvaluator
: (mValueType == Float.class) ? sFloatEvaluator : null;
}
if (mEvaluator != null) {
// KeyframeSet knows how to evaluate the common types - only give it a custom
// evaluator if one has been set on this class
mKeyframeSet.setEvaluator(mEvaluator);
}
}
@Override
public String toString() {
return mPropertyName + ": " + mKeyframeSet.toString();
}
/**
* Function used to calculate the value according to the evaluator set up for this
* PropertyValuesHolder object. This function is called by ValueAnimator.animateValue().
*
* @param fraction The elapsed, interpolated fraction of the animation.
*/
void calculateValue(float fraction) {
mAnimatedValue = mKeyframeSet.getValue(fraction);
}
/**
* The TypeEvaluator will the automatically determined based on the type of values supplied to
* PropertyValuesHolder. The evaluator can be manually set, however, if so desired. This may be
* important in cases where either the type of the values supplied do not match the way that they
* should be interpolated between, or if the values are of a custom type or one not currently
* understood by the animation system. Currently, only values of type float and int (and their
* Object equivalents: Float and Integer) are correctly interpolated; all other types require
* setting a TypeEvaluator.
*
* @param evaluator
*/
public void setEvaluator(TypeEvaluator evaluator) {
mEvaluator = evaluator;
mKeyframeSet.setEvaluator(evaluator);
}
/**
* Set the animated values for this object to this set of Objects. If there is only one value, it
* is assumed to be the end value of an animation, and an initial value will be derived, if
* possible, by calling a getter function on the object. Also, if any value is null, the value
* will be filled in when the animation starts in the same way. This mechanism of automatically
* getting null values only works if the PropertyValuesHolder object is used in conjunction {@link
* ObjectAnimator}, and with a getter function derived automatically from <code>propertyName
* </code>, since otherwise PropertyValuesHolder has no way of determining what the value should
* be.
*
* @param values One or more values that the animation will animate between.
*/
public void setObjectValues(Object... values) {
mValueType = values[0].getClass();
mKeyframeSet = KeyframeSet.ofObject(values);
}
/**
* Set the animated values for this object to this set of floats. If there is only one value, it
* is assumed to be the end value of an animation, and an initial value will be derived, if
* possible, by calling a getter function on the object. Also, if any value is null, the value
* will be filled in when the animation starts in the same way. This mechanism of automatically
* getting null values only works if the PropertyValuesHolder object is used in conjunction {@link
* ObjectAnimator}, and with a getter function derived automatically from <code>propertyName
* </code>, since otherwise PropertyValuesHolder has no way of determining what the value should
* be.
*
* @param values One or more values that the animation will animate between.
*/
public void setFloatValues(float... values) {
mValueType = float.class;
mKeyframeSet = KeyframeSet.ofFloat(values);
}
/**
* Set the animated values for this object to this set of ints. If there is only one value, it is
* assumed to be the end value of an animation, and an initial value will be derived, if possible,
* by calling a getter function on the object. Also, if any value is null, the value will be
* filled in when the animation starts in the same way. This mechanism of automatically getting
* null values only works if the PropertyValuesHolder object is used in conjunction {@link
* ObjectAnimator}, and with a getter function derived automatically from <code>propertyName
* </code>, since otherwise PropertyValuesHolder has no way of determining what the value should
* be.
*
* @param values One or more values that the animation will animate between.
*/
public void setIntValues(int... values) {
mValueType = int.class;
mKeyframeSet = KeyframeSet.ofInt(values);
}