/**
  * Returns a list of pairs of x coordinates for visual ranges representing given logical range. If
  * <code>startOffset == endOffset</code>, a pair of equal numbers is returned, corresponding to
  * target position. Target offsets are supposed to be located on the same visual line.
  */
 private TFloatArrayList logicalRangeToVisualRanges(int startOffset, int endOffset) {
   assert startOffset <= endOffset;
   TFloatArrayList result = new TFloatArrayList();
   for (VisualLineFragmentsIterator.Fragment fragment :
       VisualLineFragmentsIterator.create(myView, startOffset, false)) {
     int minOffset = fragment.getMinOffset();
     int maxOffset = fragment.getMaxOffset();
     if (startOffset == endOffset) {
       if (startOffset >= minOffset && startOffset <= maxOffset) {
         float x = fragment.offsetToX(startOffset);
         result.add(x);
         result.add(x);
         break;
       }
     } else if (startOffset < maxOffset && endOffset > minOffset) {
       float x1 = fragment.offsetToX(Math.max(minOffset, startOffset));
       float x2 = fragment.offsetToX(Math.min(maxOffset, endOffset));
       if (x1 > x2) {
         float tmp = x1;
         x1 = x2;
         x2 = tmp;
       }
       if (result.isEmpty() || x1 > result.get(result.size() - 1)) {
         result.add(x1);
         result.add(x2);
       } else {
         result.set(result.size() - 1, x2);
       }
     }
   }
   return result;
 }
  private void paintCaret(Graphics2D g_) {
    EditorImpl.CaretRectangle[] locations = myEditor.getCaretLocations(true);
    if (locations == null) return;

    Graphics2D g = IdeBackgroundUtil.getOriginalGraphics(g_);
    int lineHeight = myView.getLineHeight();
    EditorSettings settings = myEditor.getSettings();
    Color caretColor = myEditor.getColorsScheme().getColor(EditorColors.CARET_COLOR);
    if (caretColor == null) caretColor = new JBColor(CARET_DARK, CARET_LIGHT);
    g.setColor(caretColor);
    for (EditorImpl.CaretRectangle location : locations) {
      int x = location.myPoint.x;
      int y = location.myPoint.y;
      Caret caret = location.myCaret;
      boolean isRtl = location.myIsRtl;
      if (myEditor.isInsertMode() != settings.isBlockCursor()) {
        int lineWidth = JBUI.scale(settings.getLineCursorWidth());
        g.fillRect(x, y, lineWidth, lineHeight);
        if (myDocument.getTextLength() > 0
            && caret != null
            && !myView.getLineLayout(caret.getLogicalPosition().line).isLtr()) {
          g.fillPolygon(
              new int[] {
                isRtl ? x + lineWidth : x,
                isRtl ? x + lineWidth - CARET_DIRECTION_MARK_SIZE : x + CARET_DIRECTION_MARK_SIZE,
                isRtl ? x + lineWidth : x
              },
              new int[] {y, y, y + CARET_DIRECTION_MARK_SIZE},
              3);
        }
      } else {
        int width = location.myWidth;
        int startX = Math.max(0, isRtl ? x - width : x);
        g.fillRect(startX, y, width, lineHeight - 1);
        if (myDocument.getTextLength() > 0 && caret != null) {
          int targetVisualColumn = caret.getVisualPosition().column;
          for (VisualLineFragmentsIterator.Fragment fragment :
              VisualLineFragmentsIterator.create(myView, caret.getVisualLineStart(), false)) {
            int startVisualColumn = fragment.getStartVisualColumn();
            int endVisualColumn = fragment.getEndVisualColumn();
            if (startVisualColumn < targetVisualColumn && endVisualColumn > targetVisualColumn
                || startVisualColumn == targetVisualColumn && !isRtl
                || endVisualColumn == targetVisualColumn && isRtl) {
              g.setColor(ColorUtil.isDark(caretColor) ? CARET_LIGHT : CARET_DARK);
              fragment.draw(
                  g,
                  startX,
                  y + myView.getAscent(),
                  targetVisualColumn - startVisualColumn - (isRtl ? 1 : 0),
                  targetVisualColumn - startVisualColumn + (isRtl ? 0 : 1));
              break;
            }
          }
        }
      }
    }
  }
 void repaintCarets() {
   EditorImpl.CaretRectangle[] locations = myEditor.getCaretLocations(false);
   if (locations == null) return;
   int lineHeight = myView.getLineHeight();
   for (EditorImpl.CaretRectangle location : locations) {
     int x = location.myPoint.x;
     int y = location.myPoint.y;
     int width = Math.max(location.myWidth, CARET_DIRECTION_MARK_SIZE);
     myEditor.getContentComponent().repaintEditorComponent(x - width, y, width * 2, lineHeight);
   }
 }
  void paint(Graphics2D g) {
    Rectangle clip = g.getClipBounds();

    if (myEditor.getContentComponent().isOpaque()) {
      g.setColor(myEditor.getBackgroundColor());
      g.fillRect(clip.x, clip.y, clip.width, clip.height);
    }

    if (paintPlaceholderText(g)) {
      paintCaret(g);
      return;
    }

    int startLine = myView.yToVisualLine(Math.max(clip.y, 0));
    int endLine = myView.yToVisualLine(Math.max(clip.y + clip.height, 0));
    int startOffset = myView.visualPositionToOffset(new VisualPosition(startLine, 0));
    int endOffset = myView.visualPositionToOffset(new VisualPosition(endLine + 1, 0, true));
    ClipDetector clipDetector = new ClipDetector(myEditor, clip);

    paintBackground(g, clip, startLine, endLine);
    paintRightMargin(g, clip);
    paintCustomRenderers(g, startOffset, endOffset);
    MarkupModelEx docMarkup =
        (MarkupModelEx) DocumentMarkupModel.forDocument(myDocument, myEditor.getProject(), true);
    paintLineMarkersSeparators(g, clip, docMarkup, startOffset, endOffset);
    paintLineMarkersSeparators(g, clip, myEditor.getMarkupModel(), startOffset, endOffset);
    paintTextWithEffects(g, clip, startLine, endLine);
    paintHighlightersAfterEndOfLine(g, docMarkup, startOffset, endOffset);
    paintHighlightersAfterEndOfLine(g, myEditor.getMarkupModel(), startOffset, endOffset);
    paintBorderEffect(g, clipDetector, myEditor.getHighlighter(), startOffset, endOffset);
    paintBorderEffect(g, clipDetector, docMarkup, startOffset, endOffset);
    paintBorderEffect(g, clipDetector, myEditor.getMarkupModel(), startOffset, endOffset);

    paintCaret(g);

    paintComposedTextDecoration(g);
  }
 private void paintLineFragments(
     Graphics2D g, Rectangle clip, int visualLine, int y, LineFragmentPainter painter) {
   float x = visualLine == 0 ? myView.getPrefixTextWidthInPixels() : 0;
   int offset = myView.visualPositionToOffset(new VisualPosition(visualLine, 0));
   int visualLineEndOffset =
       myView.visualPositionToOffset(new VisualPosition(visualLine, Integer.MAX_VALUE, true));
   IterationState it = null;
   int prevEndOffset = -1;
   boolean firstFragment = true;
   int maxColumn = 0;
   for (VisualLineFragmentsIterator.Fragment fragment :
       VisualLineFragmentsIterator.create(myView, offset, false)) {
     int fragmentStartOffset = fragment.getStartOffset();
     int start = fragmentStartOffset;
     int end = fragment.getEndOffset();
     x = fragment.getStartX();
     if (firstFragment) {
       firstFragment = false;
       SoftWrap softWrap = myEditor.getSoftWrapModel().getSoftWrap(offset);
       if (softWrap != null) {
         prevEndOffset = offset;
         it =
             new IterationState(
                 myEditor,
                 offset == 0 ? 0 : offset - 1,
                 visualLineEndOffset,
                 true,
                 false,
                 false,
                 false);
         if (it.getEndOffset() <= offset) {
           it.advance();
         }
         painter.paintBeforeLineStart(
             g,
             it.getStartOffset() == offset
                 ? it.getBeforeLineStartBackgroundAttributes()
                 : it.getMergedAttributes(),
             fragment.getStartVisualColumn(),
             fragment.getStartX(),
             y);
       }
     }
     FoldRegion foldRegion = fragment.getCurrentFoldRegion();
     if (foldRegion == null) {
       if (start != prevEndOffset) {
         it =
             new IterationState(
                 myEditor,
                 start,
                 fragment.isRtl() ? offset : visualLineEndOffset,
                 true,
                 false,
                 false,
                 fragment.isRtl());
       }
       prevEndOffset = end;
       assert it != null;
       while (fragment.isRtl() ? start > end : start < end) {
         if (fragment.isRtl() ? it.getEndOffset() >= start : it.getEndOffset() <= start) {
           assert !it.atEnd();
           it.advance();
         }
         TextAttributes attributes = it.getMergedAttributes();
         int curEnd =
             fragment.isRtl()
                 ? Math.max(it.getEndOffset(), end)
                 : Math.min(it.getEndOffset(), end);
         float xNew = fragment.offsetToX(x, start, curEnd);
         painter.paint(
             g,
             fragment,
             fragment.isRtl() ? fragmentStartOffset - start : start - fragmentStartOffset,
             fragment.isRtl() ? fragmentStartOffset - curEnd : curEnd - fragmentStartOffset,
             attributes,
             x,
             xNew,
             y);
         x = xNew;
         start = curEnd;
       }
     } else {
       float xNew = fragment.getEndX();
       painter.paint(
           g,
           fragment,
           0,
           fragment.getEndVisualColumn() - fragment.getStartVisualColumn(),
           getFoldRegionAttributes(foldRegion),
           x,
           xNew,
           y);
       x = xNew;
       prevEndOffset = -1;
       it = null;
     }
     maxColumn = fragment.getEndVisualColumn();
   }
   if (it == null || it.getEndOffset() != visualLineEndOffset) {
     it =
         new IterationState(
             myEditor,
             visualLineEndOffset == offset ? visualLineEndOffset : visualLineEndOffset - 1,
             visualLineEndOffset,
             true,
             false,
             false,
             false);
   }
   if (!it.atEnd()) {
     it.advance();
   }
   assert it.atEnd();
   painter.paintAfterLineEnd(g, clip, it, maxColumn, x, y);
 }
  private void paintBorderEffect(
      Graphics2D g,
      ClipDetector clipDetector,
      int startOffset,
      int endOffset,
      TextAttributes attributes) {
    if (!clipDetector.rangeCanBeVisible(startOffset, endOffset)) return;
    int startLine = myDocument.getLineNumber(startOffset);
    int endLine = myDocument.getLineNumber(endOffset);
    if (startLine + 1 == endLine
        && startOffset == myDocument.getLineStartOffset(startLine)
        && endOffset == myDocument.getLineStartOffset(endLine)) {
      // special case of line highlighters
      endLine--;
      endOffset = myDocument.getLineEndOffset(endLine);
    }

    boolean rounded = attributes.getEffectType() == EffectType.ROUNDED_BOX;
    int lineHeight = myView.getLineHeight() - 1;
    g.setColor(attributes.getEffectColor());
    VisualPosition startPosition = myView.offsetToVisualPosition(startOffset, true, false);
    VisualPosition endPosition = myView.offsetToVisualPosition(endOffset, false, true);
    if (startPosition.line == endPosition.line) {
      int y = myView.visualLineToY(startPosition.line);
      TFloatArrayList ranges = adjustedLogicalRangeToVisualRanges(startOffset, endOffset);
      for (int i = 0; i < ranges.size() - 1; i += 2) {
        int startX = (int) ranges.get(i);
        int endX = (int) ranges.get(i + 1);
        if (rounded) {
          UIUtil.drawRectPickedOut(g, startX, y, endX - startX, lineHeight);
        } else {
          g.drawRect(startX, y, endX - startX, lineHeight);
        }
      }
    } else {
      int maxWidth = myView.getMaxWidthInLineRange(startPosition.line, endPosition.line) - 1;
      TFloatArrayList leadingRanges =
          adjustedLogicalRangeToVisualRanges(
              startOffset,
              myView.visualPositionToOffset(
                  new VisualPosition(startPosition.line, Integer.MAX_VALUE, true)));
      TFloatArrayList trailingRanges =
          adjustedLogicalRangeToVisualRanges(
              myView.visualPositionToOffset(new VisualPosition(endPosition.line, 0)), endOffset);
      if (!leadingRanges.isEmpty() && !trailingRanges.isEmpty()) {
        boolean containsInnerLines = endPosition.line > startPosition.line + 1;
        int leadingTopY = myView.visualLineToY(startPosition.line);
        int leadingBottomY = leadingTopY + lineHeight;
        int trailingTopY = myView.visualLineToY(endPosition.line);
        int trailingBottomY = trailingTopY + lineHeight;
        float start = 0;
        float end = 0;
        float leftGap = leadingRanges.get(0) - (containsInnerLines ? 0 : trailingRanges.get(0));
        int adjustY =
            leftGap == 0 ? 2 : leftGap > 0 ? 1 : 0; // avoiding 1-pixel gap between aligned lines
        for (int i = 0; i < leadingRanges.size() - 1; i += 2) {
          start = leadingRanges.get(i);
          end = leadingRanges.get(i + 1);
          if (i > 0) {
            drawLine(g, leadingRanges.get(i - 1), leadingBottomY, start, leadingBottomY, rounded);
          }
          drawLine(g, start, leadingBottomY + (i == 0 ? adjustY : 0), start, leadingTopY, rounded);
          if ((i + 2) < leadingRanges.size()) {
            drawLine(g, start, leadingTopY, end, leadingTopY, rounded);
            drawLine(g, end, leadingTopY, end, leadingBottomY, rounded);
          }
        }
        end = Math.max(end, maxWidth);
        drawLine(g, start, leadingTopY, end, leadingTopY, rounded);
        drawLine(g, end, leadingTopY, end, trailingTopY - 1, rounded);
        float targetX = trailingRanges.get(trailingRanges.size() - 1);
        drawLine(g, end, trailingTopY - 1, targetX, trailingTopY - 1, rounded);
        adjustY =
            end == targetX
                ? -2
                : -1; // for lastX == targetX we need to avoid a gap when rounding is used
        for (int i = trailingRanges.size() - 2; i >= 0; i -= 2) {
          start = trailingRanges.get(i);
          end = trailingRanges.get(i + 1);

          drawLine(g, end, trailingTopY + (i == 0 ? adjustY : 0), end, trailingBottomY, rounded);
          drawLine(g, end, trailingBottomY, start, trailingBottomY, rounded);
          drawLine(g, start, trailingBottomY, start, trailingTopY, rounded);
          if (i > 0) {
            drawLine(g, start, trailingTopY, trailingRanges.get(i - 1), trailingTopY, rounded);
          }
        }
        float lastX = start;
        if (containsInnerLines) {
          if (start > 0) {
            drawLine(g, start, trailingTopY, start, trailingTopY - 1, rounded);
            drawLine(g, start, trailingTopY - 1, 0, trailingTopY - 1, rounded);
            drawLine(g, 0, trailingTopY - 1, 0, leadingBottomY + 1, rounded);
          } else {
            drawLine(g, start, trailingTopY, 0, leadingBottomY + 1, rounded);
          }
          lastX = 0;
        }
        targetX = leadingRanges.get(0);
        if (lastX < targetX) {
          drawLine(g, lastX, leadingBottomY + 1, targetX, leadingBottomY + 1, rounded);
        } else {
          drawLine(g, lastX, leadingBottomY + 1, lastX, leadingBottomY, rounded);
          drawLine(g, lastX, leadingBottomY, targetX, leadingBottomY, rounded);
        }
      }
    }
  }