CircleView.java revision b8f95646fc0510eebfeaa27864023d630f34090f 
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.datetimepicker.time;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.graphics.Canvas;
22import android.graphics.Paint;
23import android.util.Log;
24import android.view.View;
25
26import com.android.datetimepicker.R;
27
28public class CircleView extends View {
29    private static final String TAG = "CircleView";
30
31    private final Paint mPaint = new Paint();
32    private boolean mIs24HourMode;
33    private int mWhite;
34    private int mBlack80;
35    private float mCircleRadiusMultiplier;
36    private float mAmPmCircleRadiusMultiplier;
37    private boolean mIsInitialized;
38
39    private boolean mDrawValuesReady;
40    private int mXCenter;
41    private int mYCenter;
42    private int mCircleRadius;
43
44    public CircleView(Context context) {
45        super(context);
46
47        Resources res = context.getResources();
48        mWhite = res.getColor(R.color.white);
49        mBlack80 = res.getColor(R.color.black_80);
50        mPaint.setAntiAlias(true);
51
52        mIsInitialized = false;
53    }
54
55    public void initialize(Context context, boolean is24HourMode) {
56        if (mIsInitialized) {
57            Log.e(TAG, "CircleView may only be initialized once.");
58            return;
59        }
60
61        Resources res = context.getResources();
62        mIs24HourMode = is24HourMode;
63        if (is24HourMode) {
64            mCircleRadiusMultiplier = Float.parseFloat(
65                    res.getString(R.string.circle_radius_multiplier_24HourMode));
66        } else {
67            mCircleRadiusMultiplier = Float.parseFloat(
68                    res.getString(R.string.circle_radius_multiplier));
69            mAmPmCircleRadiusMultiplier =
70                    Float.parseFloat(res.getString(R.string.ampm_circle_radius_multiplier));
71        }
72
73        mIsInitialized = true;
74    }
75
76
77    @Override
78    public void onDraw(Canvas canvas) {
79        int viewWidth = getWidth();
80        if (viewWidth == 0 || !mIsInitialized) {
81            return;
82        }
83
84        if (!mDrawValuesReady) {
85            mXCenter = getWidth() / 2;
86            mYCenter = getHeight() / 2;
87            mCircleRadius = (int) (Math.min(mXCenter, mYCenter) * mCircleRadiusMultiplier);
88
89            if (!mIs24HourMode) {
90                // We'll need to draw the AM/PM circles, so the main circle will need to have
91                // a slightly higher center. To keep the entire view centered vertically, we'll
92                // have to push it up by half the radius of the AM/PM circles.
93                int amPmCircleRadius = (int) (mCircleRadius * mAmPmCircleRadiusMultiplier);
94                mYCenter -= amPmCircleRadius / 2;
95            }
96
97            mDrawValuesReady = true;
98        }
99
100        mPaint.setColor(mWhite);
101        canvas.drawCircle(mXCenter, mYCenter, mCircleRadius, mPaint);
102
103        mPaint.setColor(mBlack80);
104        canvas.drawCircle(mXCenter, mYCenter, 2, mPaint);
105    }
106}
107