diff options
Diffstat (limited to 'actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/KeyframeSet.java')
| -rw-r--r-- | actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/KeyframeSet.java | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/KeyframeSet.java b/actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/KeyframeSet.java new file mode 100644 index 000000000..a71e1ad3c --- /dev/null +++ b/actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/KeyframeSet.java @@ -0,0 +1,227 @@ +/* + * 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; + } +} |