1/*
2 * Copyright (C) 2014 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.camera.ui;
18
19import android.animation.Animator;
20import android.animation.Animator.AnimatorListener;
21import android.animation.ValueAnimator;
22import android.content.res.Resources;
23import android.graphics.Canvas;
24import android.graphics.ColorFilter;
25import android.graphics.Paint;
26import android.graphics.PixelFormat;
27import android.graphics.Point;
28import android.graphics.drawable.Drawable;
29
30import com.android.camera.util.Gusterpolator;
31import com.android.camera2.R;
32
33/**
34 * This class implements a circular drawable that starts with a zero radius
35 * and can be triggered to animate expand to a given radius.
36 * <p>
37 * There are two colors associated with this drawable:
38 * <p>
39 * A background color, which is loaded from a resource
40 * R.color.mode_icon_hover_highlight.
41 * <p>
42 * And, a main color, which is attached to the main circle that is expanded last
43 * and is drawn on top of the other colors.
44 * <p>
45 * The driving purpose for this class is to implement a Material-like look and
46 * feel for mode switcher touch events.
47 */
48public class TouchCircleDrawable extends Drawable {
49    private static final int CIRCLE_ANIM_DURATION_MS = 250;
50
51    private Paint mColorPaint = new Paint();
52    private Paint mBackgroundPaint = new Paint();
53    private int mColor;
54    private int mColorAlpha = 0xff;
55    private int mColorRadius;
56    private int mBackgroundRadius;
57    private Drawable mIconDrawable;
58    private int mIconDrawableSize;
59    private boolean mDrawBackground;
60
61    private Animator.AnimatorListener mAnimatorListener;
62    private ValueAnimator.AnimatorUpdateListener mUpdateListener;
63
64    private static final int INVALID = -1;
65    private int mW = INVALID;
66    private int mH = INVALID;
67    private Point mCenter;
68
69    /**
70     * Constructor
71     *
72     * @param resources Resources, needed to poke around for the background
73     * color value.
74     * @param color The main this circle drawable expands to.
75     * @param baseColor The color of the initial expanded circle
76     * (draws behind the main color).
77     */
78    public TouchCircleDrawable(Resources resources, int color, int baseColor) {
79        super();
80
81        mColorPaint.setAntiAlias(true);
82        mBackgroundPaint.setAntiAlias(true);
83        mBackgroundPaint.setColor(resources.getColor(R.color.mode_icon_hover_highlight));
84
85        setColor(color);
86    }
87
88    /**
89     * Constructor
90     *
91     * @param resources Resources, needed to poke around for the background color value.
92     */
93    public TouchCircleDrawable(Resources resources) {
94        this(resources, 0xffffff, 0xffffff);
95    }
96
97    /**
98     * Set the size of this drawable.
99     *
100     * @param w Width to set.
101     * @param h Height to set.
102     */
103    public void setSize(int w, int h) {
104        mW = w;
105        mH = h;
106    }
107
108    /**
109     * Set the center of the circle for this drawable.
110     *
111     * @param p The center point.
112     */
113    public void setCenter(Point p) {
114        mCenter = p;
115        updateIconBounds();
116    }
117
118    /**
119     * @return The center of this drawable.
120     */
121    public Point getCenter() {
122        return mCenter;
123    }
124
125    @Override
126    public void draw(Canvas canvas) {
127        int w = mW;
128        int h = mH;
129
130        if (w == INVALID || h == INVALID || mCenter == null) {
131            return;
132        }
133
134        if (mDrawBackground) {
135            canvas.drawCircle(mCenter.x, mCenter.y, mBackgroundRadius, mBackgroundPaint);
136        }
137        canvas.drawCircle(mCenter.x, mCenter.y, mColorRadius, mColorPaint);
138        if (mIconDrawable != null) {
139            mIconDrawable.draw(canvas);
140        }
141    }
142
143    @Override
144    public void setAlpha(int alpha) {
145        mColorAlpha = alpha;
146    }
147
148    @Override
149    public void setColorFilter(ColorFilter cf) {
150        mColorPaint.setColorFilter(cf);
151    }
152
153    @Override
154    public int getOpacity() {
155        return PixelFormat.TRANSLUCENT;
156    }
157
158    /**
159     * Set the main color.
160     *
161     * @param color The main color.
162     */
163    public void setColor(int color) {
164        mColor = color;
165        mColorPaint.setColor(mColor);
166        mColorPaint.setAlpha(mColorAlpha);
167    }
168
169    public void setIconDrawable(Drawable d, int size) {
170        mIconDrawable = d;
171        mIconDrawableSize = size;
172        updateIconBounds();
173    }
174
175    private void updateIconBounds() {
176        if (mCenter != null) {
177            mIconDrawable.setBounds(
178                mCenter.x - mIconDrawableSize/2, mCenter.y - mIconDrawableSize/2,
179                mCenter.x + mIconDrawableSize/2, mCenter.y + mIconDrawableSize/2);
180        }
181    }
182
183    /**
184     * Start the expand animation.
185     */
186    public void animate() {
187        mBackgroundRadius = Math.min(mW/2, mH/2);
188
189        final ValueAnimator colorAnimator =
190                ValueAnimator.ofInt(0, Math.min(mW/2, mH/2));
191        colorAnimator.setDuration(CIRCLE_ANIM_DURATION_MS);
192        colorAnimator.setInterpolator(Gusterpolator.INSTANCE);
193        colorAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
194            @Override
195            public void onAnimationUpdate(ValueAnimator animation) {
196                mColorRadius = (Integer) animation.getAnimatedValue();
197                invalidateSelf();
198                if (mUpdateListener != null) {
199                    mUpdateListener.onAnimationUpdate(animation);
200                }
201            }
202        });
203
204        colorAnimator.addListener(new AnimatorListener() {
205            @Override
206            public void onAnimationStart(Animator animation) {
207                mDrawBackground = true;
208
209                if (mAnimatorListener != null) {
210                    mAnimatorListener.onAnimationStart(animation);
211                }
212            }
213
214            @Override
215            public void onAnimationEnd(Animator animation) {
216                mDrawBackground = false;
217
218                if (mAnimatorListener != null) {
219                    mAnimatorListener.onAnimationEnd(animation);
220                }
221            }
222
223            @Override
224            public void onAnimationCancel(Animator animation) {
225                mDrawBackground = false;
226
227                if (mAnimatorListener != null) {
228                    mAnimatorListener.onAnimationCancel(animation);
229                }
230            }
231
232            @Override
233            public void onAnimationRepeat(Animator animation) {
234                if (mAnimatorListener != null) {
235                    mAnimatorListener.onAnimationRepeat(animation);
236                }
237            }
238        });
239
240        colorAnimator.start();
241    }
242
243    /**
244     *  Reset this drawable to its initial, preanimated state.
245     */
246    public void reset() {
247        mColorRadius = 0;
248    }
249
250    /**
251     * Set an {@link android.animation.Animator.AnimatorListener} to be
252     * attached to the animation.
253     *
254     * @param listener The listener.
255     */
256    public void setAnimatorListener(Animator.AnimatorListener listener) {
257        mAnimatorListener = listener;
258    }
259
260    /**
261     * Set an {@link android.animation.ValueAnimator} to be
262     * attached to the animation.
263     *
264     * @param listener The listener.
265     */
266    public void setUpdateListener(ValueAnimator.AnimatorUpdateListener listener) {
267        mUpdateListener = listener;
268    }
269}
270