--- /dev/null
+/*
+ * 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 com.actionbarsherlock.internal.nineoldandroids.animation;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import android.view.animation.Interpolator;
+
+import com.actionbarsherlock.internal.nineoldandroids.animation.Keyframe.FloatKeyframe;
+import com.actionbarsherlock.internal.nineoldandroids.animation.Keyframe.IntKeyframe;
+import com.actionbarsherlock.internal.nineoldandroids.animation.Keyframe.ObjectKeyframe;
+
+/**
+ * This class holds a collection of Keyframe objects and is called by ValueAnimator to calculate
+ * values between those keyframes for a given animation. The class internal to the animation
+ * package because it is an implementation detail of how Keyframes are stored and used.
+ */
+@SuppressWarnings({"rawtypes", "unchecked"})
+class KeyframeSet {
+
+ int mNumKeyframes;
+
+ Keyframe mFirstKeyframe;
+ Keyframe mLastKeyframe;
+ /*Time*/Interpolator mInterpolator; // only used in the 2-keyframe case
+ ArrayList<Keyframe> mKeyframes; // only used when there are not 2 keyframes
+ TypeEvaluator mEvaluator;
+
+
+ public KeyframeSet(Keyframe... keyframes) {
+ mNumKeyframes = keyframes.length;
+ mKeyframes = new ArrayList<Keyframe>();
+ mKeyframes.addAll(Arrays.asList(keyframes));
+ mFirstKeyframe = mKeyframes.get(0);
+ mLastKeyframe = mKeyframes.get(mNumKeyframes - 1);
+ mInterpolator = mLastKeyframe.getInterpolator();
+ }
+
+ public static KeyframeSet ofInt(int... values) {
+ int numKeyframes = values.length;
+ IntKeyframe keyframes[] = new IntKeyframe[Math.max(numKeyframes,2)];
+ if (numKeyframes == 1) {
+ keyframes[0] = (IntKeyframe) Keyframe.ofInt(0f);
+ keyframes[1] = (IntKeyframe) Keyframe.ofInt(1f, values[0]);
+ } else {
+ keyframes[0] = (IntKeyframe) Keyframe.ofInt(0f, values[0]);
+ for (int i = 1; i < numKeyframes; ++i) {
+ keyframes[i] = (IntKeyframe) Keyframe.ofInt((float) i / (numKeyframes - 1), values[i]);
+ }
+ }
+ return new IntKeyframeSet(keyframes);
+ }
+
+ public static KeyframeSet ofFloat(float... values) {
+ int numKeyframes = values.length;
+ FloatKeyframe keyframes[] = new FloatKeyframe[Math.max(numKeyframes,2)];
+ if (numKeyframes == 1) {
+ keyframes[0] = (FloatKeyframe) Keyframe.ofFloat(0f);
+ keyframes[1] = (FloatKeyframe) Keyframe.ofFloat(1f, values[0]);
+ } else {
+ keyframes[0] = (FloatKeyframe) Keyframe.ofFloat(0f, values[0]);
+ for (int i = 1; i < numKeyframes; ++i) {
+ keyframes[i] = (FloatKeyframe) Keyframe.ofFloat((float) i / (numKeyframes - 1), values[i]);
+ }
+ }
+ return new FloatKeyframeSet(keyframes);
+ }
+
+ public static KeyframeSet ofKeyframe(Keyframe... keyframes) {
+ // if all keyframes of same primitive type, create the appropriate KeyframeSet
+ int numKeyframes = keyframes.length;
+ boolean hasFloat = false;
+ boolean hasInt = false;
+ boolean hasOther = false;
+ for (int i = 0; i < numKeyframes; ++i) {
+ if (keyframes[i] instanceof FloatKeyframe) {
+ hasFloat = true;
+ } else if (keyframes[i] instanceof IntKeyframe) {
+ hasInt = true;
+ } else {
+ hasOther = true;
+ }
+ }
+ if (hasFloat && !hasInt && !hasOther) {
+ FloatKeyframe floatKeyframes[] = new FloatKeyframe[numKeyframes];
+ for (int i = 0; i < numKeyframes; ++i) {
+ floatKeyframes[i] = (FloatKeyframe) keyframes[i];
+ }
+ return new FloatKeyframeSet(floatKeyframes);
+ } else if (hasInt && !hasFloat && !hasOther) {
+ IntKeyframe intKeyframes[] = new IntKeyframe[numKeyframes];
+ for (int i = 0; i < numKeyframes; ++i) {
+ intKeyframes[i] = (IntKeyframe) keyframes[i];
+ }
+ return new IntKeyframeSet(intKeyframes);
+ } else {
+ return new KeyframeSet(keyframes);
+ }
+ }
+
+ public static KeyframeSet ofObject(Object... values) {
+ int numKeyframes = values.length;
+ ObjectKeyframe keyframes[] = new ObjectKeyframe[Math.max(numKeyframes,2)];
+ if (numKeyframes == 1) {
+ keyframes[0] = (ObjectKeyframe) Keyframe.ofObject(0f);
+ keyframes[1] = (ObjectKeyframe) Keyframe.ofObject(1f, values[0]);
+ } else {
+ keyframes[0] = (ObjectKeyframe) Keyframe.ofObject(0f, values[0]);
+ for (int i = 1; i < numKeyframes; ++i) {
+ keyframes[i] = (ObjectKeyframe) Keyframe.ofObject((float) i / (numKeyframes - 1), values[i]);
+ }
+ }
+ return new KeyframeSet(keyframes);
+ }
+
+ /**
+ * Sets the TypeEvaluator to be used when calculating animated values. This object
+ * is required only for KeyframeSets that are not either IntKeyframeSet or FloatKeyframeSet,
+ * both of which assume their own evaluator to speed up calculations with those primitive
+ * types.
+ *
+ * @param evaluator The TypeEvaluator to be used to calculate animated values.
+ */
+ public void setEvaluator(TypeEvaluator evaluator) {
+ mEvaluator = evaluator;
+ }
+
+ @Override
+ public KeyframeSet clone() {
+ ArrayList<Keyframe> keyframes = mKeyframes;
+ int numKeyframes = mKeyframes.size();
+ Keyframe[] newKeyframes = new Keyframe[numKeyframes];
+ for (int i = 0; i < numKeyframes; ++i) {
+ newKeyframes[i] = keyframes.get(i).clone();
+ }
+ KeyframeSet newSet = new KeyframeSet(newKeyframes);
+ return newSet;
+ }
+
+ /**
+ * Gets the animated value, given the elapsed fraction of the animation (interpolated by the
+ * animation's interpolator) and the evaluator used to calculate in-between values. This
+ * function maps the input fraction to the appropriate keyframe interval and a fraction
+ * between them and returns the interpolated value. Note that the input fraction may fall
+ * outside the [0-1] bounds, if the animation's interpolator made that happen (e.g., a
+ * spring interpolation that might send the fraction past 1.0). We handle this situation by
+ * just using the two keyframes at the appropriate end when the value is outside those bounds.
+ *
+ * @param fraction The elapsed fraction of the animation
+ * @return The animated value.
+ */
+ public Object getValue(float fraction) {
+
+ // Special-case optimization for the common case of only two keyframes
+ if (mNumKeyframes == 2) {
+ if (mInterpolator != null) {
+ fraction = mInterpolator.getInterpolation(fraction);
+ }
+ return mEvaluator.evaluate(fraction, mFirstKeyframe.getValue(),
+ mLastKeyframe.getValue());
+ }
+ if (fraction <= 0f) {
+ final Keyframe nextKeyframe = mKeyframes.get(1);
+ final /*Time*/Interpolator interpolator = nextKeyframe.getInterpolator();
+ if (interpolator != null) {
+ fraction = interpolator.getInterpolation(fraction);
+ }
+ final float prevFraction = mFirstKeyframe.getFraction();
+ float intervalFraction = (fraction - prevFraction) /
+ (nextKeyframe.getFraction() - prevFraction);
+ return mEvaluator.evaluate(intervalFraction, mFirstKeyframe.getValue(),
+ nextKeyframe.getValue());
+ } else if (fraction >= 1f) {
+ final Keyframe prevKeyframe = mKeyframes.get(mNumKeyframes - 2);
+ final /*Time*/Interpolator interpolator = mLastKeyframe.getInterpolator();
+ if (interpolator != null) {
+ fraction = interpolator.getInterpolation(fraction);
+ }
+ final float prevFraction = prevKeyframe.getFraction();
+ float intervalFraction = (fraction - prevFraction) /
+ (mLastKeyframe.getFraction() - prevFraction);
+ return mEvaluator.evaluate(intervalFraction, prevKeyframe.getValue(),
+ mLastKeyframe.getValue());
+ }
+ Keyframe prevKeyframe = mFirstKeyframe;
+ for (int i = 1; i < mNumKeyframes; ++i) {
+ Keyframe nextKeyframe = mKeyframes.get(i);
+ if (fraction < nextKeyframe.getFraction()) {
+ final /*Time*/Interpolator interpolator = nextKeyframe.getInterpolator();
+ if (interpolator != null) {
+ fraction = interpolator.getInterpolation(fraction);
+ }
+ final float prevFraction = prevKeyframe.getFraction();
+ float intervalFraction = (fraction - prevFraction) /
+ (nextKeyframe.getFraction() - prevFraction);
+ return mEvaluator.evaluate(intervalFraction, prevKeyframe.getValue(),
+ nextKeyframe.getValue());
+ }
+ prevKeyframe = nextKeyframe;
+ }
+ // shouldn't reach here
+ return mLastKeyframe.getValue();
+ }
+
+ @Override
+ public String toString() {
+ String returnVal = " ";
+ for (int i = 0; i < mNumKeyframes; ++i) {
+ returnVal += mKeyframes.get(i).getValue() + " ";
+ }
+ return returnVal;
+ }
+}
projects / debian / openrocket / blobdiff