1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.internal.widget;
18
19import java.util.ArrayList;
20
21import android.animation.Animator;
22import android.animation.ObjectAnimator;
23import android.animation.ValueAnimator;
24import android.animation.Animator.AnimatorListener;
25import android.graphics.Canvas;
26import android.graphics.drawable.BitmapDrawable;
27import android.util.Log;
28import android.view.animation.DecelerateInterpolator;
29
30/**
31 * This class is a container for a Drawable with multiple animated properties.
32 *
33 */
34public class DrawableHolder implements AnimatorListener {
35    public static final DecelerateInterpolator EASE_OUT_INTERPOLATOR = new DecelerateInterpolator();
36    private static final String TAG = "DrawableHolder";
37    private static final boolean DBG = false;
38    private float mX = 0.0f;
39    private float mY = 0.0f;
40    private float mScaleX = 1.0f;
41    private float mScaleY = 1.0f;
42    private BitmapDrawable mDrawable;
43    private float mAlpha = 1f;
44    private ArrayList<ObjectAnimator> mAnimators = new ArrayList<ObjectAnimator>();
45    private ArrayList<ObjectAnimator> mNeedToStart = new ArrayList<ObjectAnimator>();
46
47    public DrawableHolder(BitmapDrawable drawable) {
48        this(drawable, 0.0f, 0.0f);
49    }
50
51    public DrawableHolder(BitmapDrawable drawable, float x, float y) {
52        mDrawable = drawable;
53        mX = x;
54        mY = y;
55        mDrawable.getPaint().setAntiAlias(true); // Force AA
56        mDrawable.setBounds(0, 0, mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());
57    }
58
59    /**
60     *
61     * Adds an animation that interpolates given property from its current value
62     * to the given value.
63     *
64     * @param duration the duration, in ms.
65     * @param delay the delay to start the animation, in ms.
66     * @param property the property to animate
67     * @param toValue the target value
68     * @param replace if true, replace the current animation with this one.
69     */
70    public ObjectAnimator addAnimTo(long duration, long delay,
71            String property, float toValue, boolean replace) {
72
73        if (replace) removeAnimationFor(property);
74
75        ObjectAnimator anim = ObjectAnimator.ofFloat(this, property, toValue);
76        anim.setDuration(duration);
77        anim.setStartDelay(delay);
78        anim.setInterpolator(EASE_OUT_INTERPOLATOR);
79        this.addAnimation(anim, replace);
80        if (DBG) Log.v(TAG, "animationCount = " + mAnimators.size());
81        return anim;
82    }
83
84    /**
85     * Stops all animations for the given property and removes it from the list.
86     *
87     * @param property
88     */
89    public void removeAnimationFor(String property) {
90        ArrayList<ObjectAnimator> removalList = (ArrayList<ObjectAnimator>)mAnimators.clone();
91        for (ObjectAnimator currentAnim : removalList) {
92            if (property.equals(currentAnim.getPropertyName())) {
93                currentAnim.cancel();
94            }
95        }
96    }
97
98    /**
99     * Stops all animations and removes them from the list.
100     */
101    public void clearAnimations() {
102        for (ObjectAnimator currentAnim : mAnimators) {
103            currentAnim.cancel();
104        }
105        mAnimators.clear();
106    }
107
108    /**
109     * Adds the given animation to the list of animations for this object.
110     *
111     * @param anim
112     * @param overwrite
113     * @return
114     */
115    private DrawableHolder addAnimation(ObjectAnimator anim, boolean overwrite) {
116        if (anim != null)
117            mAnimators.add(anim);
118        mNeedToStart.add(anim);
119        return this;
120    }
121
122    /**
123     * Draw this object to the canvas using the properties defined in this class.
124     *
125     * @param canvas canvas to draw into
126     */
127    public void draw(Canvas canvas) {
128        final float threshold = 1.0f / 256.0f; // contribution less than 1 LSB of RGB byte
129        if (mAlpha <= threshold) // don't bother if it won't show up
130            return;
131        canvas.save(Canvas.MATRIX_SAVE_FLAG);
132        canvas.translate(mX, mY);
133        canvas.scale(mScaleX, mScaleY);
134        canvas.translate(-0.5f*getWidth(), -0.5f*getHeight());
135        mDrawable.setAlpha((int) Math.round(mAlpha * 255f));
136        mDrawable.draw(canvas);
137        canvas.restore();
138    }
139
140    /**
141     * Starts all animations added since the last call to this function.  Used to synchronize
142     * animations.
143     *
144     * @param listener an optional listener to add to the animations. Typically used to know when
145     * to invalidate the surface these are being drawn to.
146     */
147    public void startAnimations(ValueAnimator.AnimatorUpdateListener listener) {
148        for (int i = 0; i < mNeedToStart.size(); i++) {
149            ObjectAnimator anim = mNeedToStart.get(i);
150            anim.addUpdateListener(listener);
151            anim.addListener(this);
152            anim.start();
153        }
154        mNeedToStart.clear();
155    }
156
157
158    public void setX(float value) {
159        mX = value;
160    }
161
162    public void setY(float value) {
163        mY = value;
164    }
165
166    public void setScaleX(float value) {
167        mScaleX = value;
168    }
169
170    public void setScaleY(float value) {
171        mScaleY = value;
172    }
173
174    public void setAlpha(float alpha) {
175        mAlpha = alpha;
176    }
177
178    public float getX() {
179        return mX;
180    }
181
182    public float getY() {
183        return mY;
184    }
185
186    public float getScaleX() {
187        return mScaleX;
188    }
189
190    public float getScaleY() {
191        return mScaleY;
192    }
193
194    public float getAlpha() {
195        return mAlpha;
196    }
197
198    public BitmapDrawable getDrawable() {
199        return mDrawable;
200    }
201
202    public int getWidth() {
203        return mDrawable.getIntrinsicWidth();
204    }
205
206    public int getHeight() {
207        return mDrawable.getIntrinsicHeight();
208    }
209
210    public void onAnimationCancel(Animator animation) {
211
212    }
213
214    public void onAnimationEnd(Animator animation) {
215        mAnimators.remove(animation);
216    }
217
218    public void onAnimationRepeat(Animator animation) {
219
220    }
221
222    public void onAnimationStart(Animator animation) {
223
224    }
225}
226