Java Code Examples for android.text.Layout#getLineDescent()

private MoreImageSpan createMoreSpan(int count) {
    String moreText = String.format(mMoreItem.getText().toString(), count);
    TextPaint morePaint = new TextPaint(getPaint());
    morePaint.setTextSize(mMoreItem.getTextSize());
    morePaint.setColor(mMoreItem.getCurrentTextColor());
    int width = (int) morePaint.measureText(moreText) + mMoreItem.getPaddingLeft()
            + mMoreItem.getPaddingRight();
    int height = getLineHeight();
    Bitmap drawable = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(drawable);
    int adjustedHeight = height;
    Layout layout = getLayout();
    if (layout != null) {
        adjustedHeight -= layout.getLineDescent(0);
    }
    canvas.drawText(moreText, 0, moreText.length(), 0, adjustedHeight, morePaint);

    Drawable result = new BitmapDrawable(getResources(), drawable);
    result.setBounds(0, 0, width, height);
    return new MoreImageSpan(result);
}
 

private MoreImageSpan createMoreSpan(int count) {
    String moreText = String.format(mMoreItem.getText().toString(), count);
    TextPaint morePaint = new TextPaint(getPaint());
    morePaint.setTextSize(mMoreItem.getTextSize());
    morePaint.setColor(mMoreItem.getCurrentTextColor());
    int width = (int) morePaint.measureText(moreText) + mMoreItem.getPaddingLeft()
            + mMoreItem.getPaddingRight();
    int height = getLineHeight();
    Bitmap drawable = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(drawable);
    int adjustedHeight = height;
    Layout layout = getLayout();
    if (layout != null) {
        adjustedHeight -= layout.getLineDescent(0);
    }
    canvas.drawText(moreText, 0, moreText.length(), 0, adjustedHeight, morePaint);

    Drawable result = new BitmapDrawable(getResources(), drawable);
    result.setBounds(0, 0, width, height);
    return new MoreImageSpan(result);
}
 

/**
 * Prior to version 20, If the Layout specifies extra space between lines (either by spacingmult
 * or spacingadd) the StaticLayout would erroneously add this space after the last line as well.
 * This bug was fixed in version 20. This method calculates the extra space and reduces the height
 * by that amount.
 *
 * @param layout The layout.
 * @return The height of the layout.
 */
public static int getHeight(Layout layout) {
  if (layout == null) {
    return 0;
  }

  int extra = 0;
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT_WATCH
      && layout instanceof StaticLayout) {
    int line = Math.max(0, layout.getLineCount() - 1);
    int above = layout.getLineAscent(line);
    int below = layout.getLineDescent(line);
    float originalSize = (below - above - layout.getSpacingAdd()) / layout.getSpacingMultiplier();
    float ex = below - above - originalSize;
    if (ex >= 0) {
      extra = (int) (ex + 0.5);
    } else {
      extra = -(int) (-ex + 0.5);
    }
  }
  return layout.getHeight() - extra;
}
 

private MoreImageSpan createMoreSpan(final int count)
{
final String moreText=String.format(mMoreItem.getText().toString(),count);
final TextPaint morePaint=new TextPaint(getPaint());
morePaint.setTextSize(mMoreItem.getTextSize());
morePaint.setColor(mMoreItem.getCurrentTextColor());
final int width=(int)morePaint.measureText(moreText)+mMoreItem.getPaddingLeft()+mMoreItem.getPaddingRight();
final int height=getLineHeight();
final Bitmap drawable=Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);
final Canvas canvas=new Canvas(drawable);
int adjustedHeight=height;
final Layout layout=getLayout();
if(layout!=null)
  adjustedHeight-=layout.getLineDescent(0);
canvas.drawText(moreText,0,moreText.length(),0,adjustedHeight,morePaint);
final Drawable result=new BitmapDrawable(getResources(),drawable);
result.setBounds(0,0,width,height);
return new MoreImageSpan(result);
}
 

private void drawText(Canvas canvas) {
    Map<Integer, String> lineNumbles = getLineNumbers();
    Layout layout = getLayout();
    int selectLine = getSelectLine();
    int range[] = new int[4];
    {// 计算需要绘制的行号所需要的范围

        int clipLeft = 0;
        int clipTop = (getScrollView().getScrollY() == 0) ? 0
                : getExtendedPaddingTop() + getScrollView().getScrollY()
                - getScrollView().getPaddingTop();
        int clipRight = getWidth();
        int clipBottom = clipTop + getScrollView().getHeight();
        Rect rect = new Rect(clipLeft, clipTop, clipRight, clipBottom);
        getLineRangeForDraw(rect, range);
    }
    int firstLine = range[0];
    int lastLine = range[1];
    if (firstLine < 0) {
        return;
    }
    int previousLineBottom = layout.getLineTop(firstLine);
    int previousLineEnd = layout.getLineStart(firstLine);
    int lineCount = getLineCount();
    Paint paint = getPaint();


    for (int lineNum = firstLine; lineNum <= lastLine
            && lineNum < lineCount; lineNum++) {
        int start = previousLineEnd;

        previousLineEnd = layout.getLineStart(lineNum + 1);

        int end = layout.getLineVisibleEnd(lineNum);
        int ltop = previousLineBottom;
        int lbottom = layout.getLineTop(lineNum + 1);
        previousLineBottom = lbottom;
        int lbaseline = lbottom - layout.getLineDescent(lineNum);
        int left = getPaddingLeft();
        // 绘制选择行背景
        if (lineNum == selectLine) {
            paint.setColor(lineNumberBackgroundColor);
            paint.setStyle(Paint.Style.STROKE);
            paint.setStrokeWidth(mLineNumberBgStrokeWidth);
            canvas.drawRect(getPaddingLeft() - mLineNumberBgStrokeWidth, ltop, getRight() - getPaddingRight() + mLineNumberBgStrokeWidth, lbottom, paint);
            paint.setStyle(Paint.Style.FILL);
        }
        // 绘制行号
        String lineNumberText = lineNumbles.get(lineNum);
        if (lineNumberText != null) {
            paint.setColor(lineNumberColor);
            canvas.drawText(lineNumberText, 0, lineNumberText.length(), mNumberPadding,
                    lbaseline, paint);
        }
        int textLength = getText().length();
        // 绘制文字
        if (start < textLength) {
            //计算需要绘制的文字位置
            //获取改行所有文字宽度
            float[] widths = new float[end - start + 1];
            paint.getTextWidths(getText(), start, end, widths);
            //计算获取看到的文字第一个位置，和对应的偏移x
            float firstNeedDrawPos[] = getLineFirstCharPosForDraw(widths);
            int firstPos = (int) firstNeedDrawPos[0];
            float offsetX = firstNeedDrawPos[1];
            int maxOffX = getViewScrollX() + getVisibleWidth();
            // 文字着色
            for (int i = start + firstPos; i < end && i < textLength; ) {
                if (offsetX > maxOffX) {
                    break;
                }
                int color = getCodeColor(i);
                {
                    float fontWidths = widths[i - start];
                    int fontCount = 1;
                    for (int j = i + 1; j < end && j < textLength; j++) {
                        if (color == getCodeColor(j)) {
                            fontCount++;
                            fontWidths += widths[j - start];
                        } else {
                            break;
                        }
                    }
                    if (color == 0) {
                        color = defaultTextColor;
                    }

                    paint.setColor(color);
                    canvas.drawText(getText(), i, i + fontCount, left + offsetX, lbaseline, paint);
                    i += fontCount;
                    offsetX += fontWidths;

                }
            }
        }
    }

}