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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* 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.android.internal.widget;
import java.util.ArrayList;
import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.animation.Animator.AnimatorListener;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;
import android.view.animation.DecelerateInterpolator;
/**
* This class is a container for a Drawable with multiple animated properties.
*
*/
public class DrawableHolder implements AnimatorListener {
public static final DecelerateInterpolator EASE_OUT_INTERPOLATOR = new DecelerateInterpolator();
private static final String TAG = "DrawableHolder";
private static final boolean DBG = false;
private float mX = 0.0f;
private float mY = 0.0f;
private float mScaleX = 1.0f;
private float mScaleY = 1.0f;
private BitmapDrawable mDrawable;
private float mAlpha = 1f;
private ArrayList mAnimators = new ArrayList();
private ArrayList mNeedToStart = new ArrayList();
public DrawableHolder(BitmapDrawable drawable) {
this(drawable, 0.0f, 0.0f);
}
public DrawableHolder(BitmapDrawable drawable, float x, float y) {
mDrawable = drawable;
mX = x;
mY = y;
mDrawable.getPaint().setAntiAlias(true); // Force AA
mDrawable.setBounds(0, 0, mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());
}
/**
*
* Adds an animation that interpolates given property from its current value
* to the given value.
*
* @param duration the duration, in ms.
* @param delay the delay to start the animation, in ms.
* @param property the property to animate
* @param toValue the target value
* @param replace if true, replace the current animation with this one.
*/
public ObjectAnimator addAnimTo(long duration, long delay,
String property, float toValue, boolean replace) {
if (replace) removeAnimationFor(property);
ObjectAnimator anim = ObjectAnimator.ofFloat(this, property, toValue);
anim.setDuration(duration);
anim.setStartDelay(delay);
anim.setInterpolator(EASE_OUT_INTERPOLATOR);
this.addAnimation(anim, replace);
if (DBG) Log.v(TAG, "animationCount = " + mAnimators.size());
return anim;
}
/**
* Stops all animations for the given property and removes it from the list.
*
* @param property
*/
public void removeAnimationFor(String property) {
ArrayList removalList = (ArrayList)mAnimators.clone();
for (ObjectAnimator currentAnim : removalList) {
if (property.equals(currentAnim.getPropertyName())) {
currentAnim.cancel();
}
}
}
/**
* Stops all animations and removes them from the list.
*/
public void clearAnimations() {
for (ObjectAnimator currentAnim : mAnimators) {
currentAnim.cancel();
}
mAnimators.clear();
}
/**
* Adds the given animation to the list of animations for this object.
*
* @param anim
* @param overwrite
* @return
*/
private DrawableHolder addAnimation(ObjectAnimator anim, boolean overwrite) {
if (anim != null)
mAnimators.add(anim);
mNeedToStart.add(anim);
return this;
}
/**
* Draw this object to the canvas using the properties defined in this class.
*
* @param canvas canvas to draw into
*/
public void draw(Canvas canvas) {
final float threshold = 1.0f / 256.0f; // contribution less than 1 LSB of RGB byte
if (mAlpha <= threshold) // don't bother if it won't show up
return;
canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.translate(mX, mY);
canvas.scale(mScaleX, mScaleY);
canvas.translate(-0.5f*getWidth(), -0.5f*getHeight());
mDrawable.setAlpha((int) Math.round(mAlpha * 255f));
mDrawable.draw(canvas);
canvas.restore();
}
/**
* Starts all animations added since the last call to this function. Used to synchronize
* animations.
*
* @param listener an optional listener to add to the animations. Typically used to know when
* to invalidate the surface these are being drawn to.
*/
public void startAnimations(ValueAnimator.AnimatorUpdateListener listener) {
for (int i = 0; i < mNeedToStart.size(); i++) {
ObjectAnimator anim = mNeedToStart.get(i);
anim.addUpdateListener(listener);
anim.addListener(this);
anim.start();
}
mNeedToStart.clear();
}
public void setX(float value) {
mX = value;
}
public void setY(float value) {
mY = value;
}
public void setScaleX(float value) {
mScaleX = value;
}
public void setScaleY(float value) {
mScaleY = value;
}
public void setAlpha(float alpha) {
mAlpha = alpha;
}
public float getX() {
return mX;
}
public float getY() {
return mY;
}
public float getScaleX() {
return mScaleX;
}
public float getScaleY() {
return mScaleY;
}
public float getAlpha() {
return mAlpha;
}
public BitmapDrawable getDrawable() {
return mDrawable;
}
public int getWidth() {
return mDrawable.getIntrinsicWidth();
}
public int getHeight() {
return mDrawable.getIntrinsicHeight();
}
public void onAnimationCancel(Animator animation) {
}
public void onAnimationEnd(Animator animation) {
mAnimators.remove(animation);
}
public void onAnimationRepeat(Animator animation) {
}
public void onAnimationStart(Animator animation) {
}
}