MainActivity.java 文件源码

@Override
public void onDraw(@NonNull final Canvas canvas) {

    if (lineCount != getLineCount() || startingLine != pageSystem.getStartingLine()) {
        startingLine = pageSystem.getStartingLine();
        lineCount = getLineCount();
        lineUtils.updateHasNewLineArray(pageSystem
                .getStartingLine(), lineCount, getLayout(), getText().toString());

        isGoodLineArray = lineUtils.getGoodLines();
        realLines = lineUtils.getRealLines();

    }

    if (PreferenceHelper.getLineNumbers(getContext())) {
        wrapContent = PreferenceHelper.getWrapContent(getContext());

        for (int i = 0; i < lineCount; i++) {
            // if last line we count it anyway
            if (!wrapContent
                    || isGoodLineArray[i]) {
                realLine = realLines[i];

                canvas.drawText(String.valueOf(realLine),
                        numbersWidth, // they are all center aligned
                        paddingTop + lineHeight * (i + 1),
                        mPaintNumbers);
            }
        }
    }

    super.onDraw(canvas);
}