DatePickerView.java 文件源码

/**
 * @param position The difference between the distance mCurrentSelected.
 * @param type     The difference from mCurrentSelected 1 means downward drawing, and -1 indicates upward rendering.
 */
private void drawOtherText(Canvas canvas, int position, int type) {
    float d = MARGIN_ALPHA * mMinTextSize * position + type * mMoveLen;
    float scale = parabola(mViewHeight / 4.0f, d);
    float size = (mMaxTextSize - mMinTextSize) * scale + mMinTextSize;
    nPaint.setTextSize(size);
    nPaint.setAlpha((int) ((mMaxTextAlpha - mMinTextAlpha) * scale + mMinTextAlpha));
    float y = (float) (mViewHeight / 2.0 + type * d);
    FontMetricsInt fmi = nPaint.getFontMetricsInt();
    float baseline = (float) (y - (fmi.bottom / 2.0 + fmi.top / 2.0));
    canvas.drawText(mDataList.get(mCurrentSelected + type * position),
            (float) (mViewWidth / 2.0), baseline, nPaint);
}