ProgressHorizontal.java 文件源码

@Override
protected void onDraw(Canvas canvas) {
    float factor;
    if (mProgress == 0 || mProgress == 1) {
        factor = 1;
    } else {
        long elapsed = System.currentTimeMillis() - mProgressSetTime;
        if (elapsed < 0) {
            factor = 0;
        } else if (elapsed > mSmoothAnimDuration) {
            factor = 1;
        } else {
            factor = elapsed / (float) mSmoothAnimDuration;
        }
    }
    mSmoothProgress = mStartProgress + factor * (mProgress - mStartProgress);

    // Draw background
    if (null != mDrbBackground) {
        mDrbBackground.draw(canvas);
    }

    // Draw progress
    if (null != mDrbProgress) {
        if (mDrbProgress instanceof NinePatchDrawable
                || (mDrbProgress instanceof DrawableContainer && ((DrawableContainer) mDrbProgress).getCurrent() instanceof NinePatchDrawable)) {
            if (mSmoothProgress == 0) {
                mDrbProgress.setBounds(0, 0, 0, 0);
            } else {
                mDrbProgress.setBounds(0, mRawProgressBounds.top,
                        (int) (mRawProgressBounds.left + (mRawProgressBounds.width() - mProgressDrbMinWidth)
                                * mSmoothProgress)
                                + mProgressDrbMinWidth, mRawProgressBounds.bottom);
            }
        }
        mDrbProgress.draw(canvas);
    }

    // Draw progress text
    if (mProgressTextVisible) {
        mSb.delete(0, mSb.length());
        if (StringUtils.isEmpty(mText)) {
            mSb.append((int) (mSmoothProgress * 100));
            mSb.append('%');
        } else {
            mSb.append(mText);
        }
        String text = mSb.toString();

        mTextPaint.setAntiAlias(true);
        mTextPaint.setColor(mProgressTextColor);
        mTextPaint.setTextSize(mProgressTextSize);
        mTextPaint.setTypeface(mTypeface);
        mTextPaint.setTextAlign(Align.CENTER);
        FontMetrics fm = mTextPaint.getFontMetrics();
        int fontH = (int) (Math.abs(fm.descent - fm.ascent));
        canvas.drawText(text, getWidth() >> 1, ((getHeight() - getPaddingTop() - getPaddingBottom()) >> 1) + (fontH >> 1), mTextPaint);

    }

    if (factor != 1) {
        invalidate();
    }
    notifyProgressChange(mSmoothProgress, mProgress);
}