CircularProgressDrawable.java

/*
 * Copyright (c) 2014. Marshal Chen.
 */

package com.marshalchen.common.uimodule.circularProgressButton;

import android.graphics.*;
import android.graphics.drawable.Drawable;

class CircularProgressDrawable extends Drawable {

    private float mSweepAngle;
    private float mStartAngle;
    private int mSize;
    private int mStrokeWidth;
    private int mStrokeColor;

    public CircularProgressDrawable(int size, int strokeWidth, int strokeColor) {
        mSize = size;
        mStrokeWidth = strokeWidth;
        mStrokeColor = strokeColor;
        mStartAngle = -90;
        mSweepAngle = 0;
    }

    public void setSweepAngle(float sweepAngle) {
        mSweepAngle = sweepAngle;
    }

    public int getSize() {
        return mSize;
    }

    @Override
    public void draw(Canvas canvas) {
        final Rect bounds = getBounds();

        if (mPath == null) {
            mPath = new Path();
        }
        mPath.reset();
        mPath.addArc(getRect(), mStartAngle, mSweepAngle);
        mPath.offset(bounds.left, bounds.top);
        canvas.drawPath(mPath, createPaint());
    }

    @Override
    public void setAlpha(int alpha) {

    }

    @Override
    public void setColorFilter(ColorFilter cf) {
    }

    @Override
    public int getOpacity() {
        return 1;
    }

    private RectF mRectF;
    private Paint mPaint;
    private Path mPath;

    private RectF getRect() {
        if (mRectF == null) {
            int index = mStrokeWidth / 2;
            mRectF = new RectF(index, index, getSize() - index, getSize() - index);
        }
        return mRectF;
    }

    private Paint createPaint() {
        if (mPaint == null) {
            mPaint = new Paint();
            mPaint.setAntiAlias(true);
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setStrokeWidth(mStrokeWidth);
            mPaint.setColor(mStrokeColor);
        }

        return mPaint;
    }
}