1/*
2 * Copyright (C) 2013 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.content.Context;
20import android.graphics.Canvas;
21import android.graphics.Color;
22import android.graphics.Paint;
23import android.graphics.RectF;
24import android.view.View;
25
26import com.android.camera2.R;
27
28/**
29 * Renders a circular progress bar on the screen.
30 */
31public class ProgressRenderer {
32    private final int mProgressRadius;
33    private final Paint mProgressBasePaint;
34    private final Paint mProgressPaint;
35
36    private RectF mArcBounds = new RectF(0, 0, 1, 1);
37    private int mProgressAngleDegrees = 270;
38    private boolean mVisible = false;
39    private final View mParentView;
40    private final Runnable mInvalidateParentViewRunnable = new Runnable() {
41        @Override
42        public void run() {
43            mParentView.invalidate();
44        }
45    };
46
47    /**
48     * After we reach 100%, keep on painting the progress for another x milliseconds
49     * before hiding it.
50     */
51    private static final int SHOW_PROGRESS_X_ADDITIONAL_MS = 100;
52
53    public ProgressRenderer(Context context, View parent) {
54        mParentView = parent;
55        mProgressRadius = context.getResources().getDimensionPixelSize(R.dimen.pie_progress_radius);
56        int pieProgressWidth = context.getResources().getDimensionPixelSize(
57                R.dimen.pie_progress_width);
58        mProgressBasePaint = createProgressPaint(pieProgressWidth, 0.2f);
59        mProgressPaint = createProgressPaint(pieProgressWidth, 1.0f);
60    }
61
62    /**
63     * Shows a progress indicator. If the progress is '100', the progress
64     * indicator will be hidden.
65     * <p>
66     * Can be called from any thread.
67     *
68     * @param percent the progress in percent (0-100).
69     */
70    public void setProgress(int percent) {
71        // Clamp the value.
72        percent = Math.min(100, Math.max(percent, 0));
73        mProgressAngleDegrees = (int) ((360f / 100) * percent);
74
75        // We hide the progress once we drew the 100% state once.
76        if (percent < 100) {
77            mVisible = true;
78        }
79        mParentView.post(mInvalidateParentViewRunnable);
80    }
81
82    /**
83     * Draw the current progress (if < 100%) centered at the given location.
84     */
85    public void onDraw(Canvas canvas, int centerX, int centerY) {
86        if (!mVisible) {
87            return;
88        }
89        mArcBounds = new RectF(centerX - mProgressRadius, centerY - mProgressRadius, centerX
90                + mProgressRadius,
91                centerY + mProgressRadius);
92
93        canvas.drawCircle(centerX, centerY, mProgressRadius, mProgressBasePaint);
94        canvas.drawArc(mArcBounds, -90, mProgressAngleDegrees, false, mProgressPaint);
95
96        // After we reached 100%, we paint the progress renderer for another x
97        // milliseconds until we hide it.
98        if (mProgressAngleDegrees == 360) {
99            mVisible = false;
100            mParentView.postDelayed(
101                new Runnable() {
102                    @Override
103                    public void run() {
104                        mParentView.invalidate();
105                    }
106                }, SHOW_PROGRESS_X_ADDITIONAL_MS);
107        }
108    }
109
110    /**
111     * @return Whether the progress renderer is visible.
112     */
113    public boolean isVisible() {
114        return mVisible;
115    }
116
117    private static Paint createProgressPaint(int width, float alpha) {
118        Paint paint = new Paint();
119        paint.setAntiAlias(true);
120        // 20% alpha.
121        paint.setColor(Color.argb((int) (alpha * 255), 255, 255, 255));
122        paint.setStrokeWidth(width);
123        paint.setStyle(Paint.Style.STROKE);
124        return paint;
125    }
126}
127