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 android.support.v4.widget;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.graphics.Color;
22import android.graphics.Paint;
23import android.graphics.RadialGradient;
24import android.graphics.Shader;
25import android.graphics.drawable.ShapeDrawable;
26import android.graphics.drawable.shapes.OvalShape;
27import android.support.v4.view.ViewCompat;
28import android.view.animation.Animation;
29import android.widget.ImageView;
30
31/**
32 * Private class created to work around issues with AnimationListeners being
33 * called before the animation is actually complete and support shadows on older
34 * platforms.
35 *
36 * @hide
37 */
38class CircleImageView extends ImageView {
39
40    private static final int KEY_SHADOW_COLOR = 0x1E000000;
41    private static final int FILL_SHADOW_COLOR = 0x3D000000;
42    // PX
43    private static final float X_OFFSET = 0f;
44    private static final float Y_OFFSET = 1.75f;
45    private static final float SHADOW_RADIUS = 3.5f;
46    private static final int SHADOW_ELEVATION = 4;
47
48    private Animation.AnimationListener mListener;
49    private int mShadowRadius;
50
51    public CircleImageView(Context context, int color, final float radius) {
52        super(context);
53        final float density = getContext().getResources().getDisplayMetrics().density;
54        final int diameter = (int) (radius * density * 2);
55        final int shadowYOffset = (int) (density * Y_OFFSET);
56        final int shadowXOffset = (int) (density * X_OFFSET);
57
58        mShadowRadius = (int) (density * SHADOW_RADIUS);
59
60        ShapeDrawable circle;
61        if (elevationSupported()) {
62            circle = new ShapeDrawable(new OvalShape());
63            ViewCompat.setElevation(this, SHADOW_ELEVATION * density);
64        } else {
65            OvalShape oval = new OvalShadow(mShadowRadius, diameter);
66            circle = new ShapeDrawable(oval);
67            ViewCompat.setLayerType(this, ViewCompat.LAYER_TYPE_SOFTWARE, circle.getPaint());
68            circle.getPaint().setShadowLayer(mShadowRadius, shadowXOffset, shadowYOffset,
69                    KEY_SHADOW_COLOR);
70            final int padding = mShadowRadius;
71            // set padding so the inner image sits correctly within the shadow.
72            setPadding(padding, padding, padding, padding);
73        }
74        circle.getPaint().setColor(color);
75        setBackgroundDrawable(circle);
76    }
77
78    private boolean elevationSupported() {
79        return android.os.Build.VERSION.SDK_INT >= 21;
80    }
81
82    @Override
83    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
84        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
85        if (!elevationSupported()) {
86            setMeasuredDimension(getMeasuredWidth() + mShadowRadius*2, getMeasuredHeight()
87                    + mShadowRadius*2);
88        }
89    }
90
91    public void setAnimationListener(Animation.AnimationListener listener) {
92        mListener = listener;
93    }
94
95    @Override
96    public void onAnimationStart() {
97        super.onAnimationStart();
98        if (mListener != null) {
99            mListener.onAnimationStart(getAnimation());
100        }
101    }
102
103    @Override
104    public void onAnimationEnd() {
105        super.onAnimationEnd();
106        if (mListener != null) {
107            mListener.onAnimationEnd(getAnimation());
108        }
109    }
110
111    /**
112     * Update the background color of the circle image view.
113     *
114     * @param colorRes Id of a color resource.
115     */
116    public void setBackgroundColorRes(int colorRes) {
117        setBackgroundColor(getContext().getResources().getColor(colorRes));
118    }
119
120    @Override
121    public void setBackgroundColor(int color) {
122        if (getBackground() instanceof ShapeDrawable) {
123            ((ShapeDrawable) getBackground()).getPaint().setColor(color);
124        }
125    }
126
127    private class OvalShadow extends OvalShape {
128        private RadialGradient mRadialGradient;
129        private Paint mShadowPaint;
130        private int mCircleDiameter;
131
132        public OvalShadow(int shadowRadius, int circleDiameter) {
133            super();
134            mShadowPaint = new Paint();
135            mShadowRadius = shadowRadius;
136            mCircleDiameter = circleDiameter;
137            mRadialGradient = new RadialGradient(mCircleDiameter / 2, mCircleDiameter / 2,
138                    mShadowRadius, new int[] {
139                            FILL_SHADOW_COLOR, Color.TRANSPARENT
140                    }, null, Shader.TileMode.CLAMP);
141            mShadowPaint.setShader(mRadialGradient);
142        }
143
144        @Override
145        public void draw(Canvas canvas, Paint paint) {
146            final int viewWidth = CircleImageView.this.getWidth();
147            final int viewHeight = CircleImageView.this.getHeight();
148            canvas.drawCircle(viewWidth / 2, viewHeight / 2, (mCircleDiameter / 2 + mShadowRadius),
149                    mShadowPaint);
150            canvas.drawCircle(viewWidth / 2, viewHeight / 2, (mCircleDiameter / 2), paint);
151        }
152    }
153}
154