private boolean paintPlaceholderText(Graphics2D g) {
    CharSequence hintText = myEditor.getPlaceholder();
    EditorComponentImpl editorComponent = myEditor.getContentComponent();
    if (myDocument.getTextLength() > 0
        || hintText == null
        || hintText.length() == 0
        || KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner() == editorComponent
            && !myEditor.getShowPlaceholderWhenFocused()) {
      return false;
    }

    hintText =
        SwingUtilities.layoutCompoundLabel(
            g.getFontMetrics(),
            hintText.toString(),
            null,
            0,
            0,
            0,
            0,
            editorComponent.getBounds(),
            new Rectangle(),
            new Rectangle(),
            0);
    g.setColor(myEditor.getFoldingModel().getPlaceholderAttributes().getForegroundColor());
    g.setFont(myEditor.getColorsScheme().getFont(EditorFontType.PLAIN));
    g.drawString(hintText.toString(), 0, myView.getAscent());
    return true;
  }
 private void paintBackground(Graphics2D g, Color color, float x, int y, float width) {
   if (width <= 0
       || color == null
       || color.equals(myEditor.getColorsScheme().getDefaultBackground())
       || color.equals(myEditor.getBackgroundColor())) return;
   g.setColor(color);
   g.fillRect((int) x, y, (int) width, myView.getLineHeight());
 }
  private void paintWhitespace(
      Graphics2D g,
      CharSequence text,
      float x,
      int y,
      int start,
      int end,
      EditorImpl.LineWhitespacePaintingStrategy whitespacePaintingStrategy,
      VisualLineFragmentsIterator.Fragment fragment) {
    g.setColor(myEditor.getColorsScheme().getColor(EditorColors.WHITESPACES_COLOR));
    boolean isRtl = fragment.isRtl();
    int baseStartOffset = fragment.getStartOffset();
    int startOffset = isRtl ? baseStartOffset - start : baseStartOffset + start;
    for (int i = start; i < end; i++) {
      int charOffset = isRtl ? baseStartOffset - i - 1 : baseStartOffset + i;
      char c = text.charAt(charOffset);
      if (" \t\u3000".indexOf(c) >= 0
          && whitespacePaintingStrategy.showWhitespaceAtOffset(charOffset)) {
        int startX =
            (int)
                fragment.offsetToX(
                    x, startOffset, isRtl ? baseStartOffset - i : baseStartOffset + i);
        int endX =
            (int)
                fragment.offsetToX(
                    x, startOffset, isRtl ? baseStartOffset - i - 1 : baseStartOffset + i + 1);

        if (c == ' ') {
          g.fillRect((startX + endX) / 2, y, 1, 1);
        } else if (c == '\t') {
          endX -= myView.getPlainSpaceWidth() / 4;
          int height = myView.getCharHeight();
          int halfHeight = height / 2;
          int mid = y - halfHeight;
          int top = y - height;
          UIUtil.drawLine(g, startX, mid, endX, mid);
          UIUtil.drawLine(g, endX, y, endX, top);
          g.fillPolygon(
              new int[] {endX - halfHeight, endX - halfHeight, endX},
              new int[] {y, y - height, y - halfHeight},
              3);
        } else if (c == '\u3000') { // ideographic space
          final int charHeight = myView.getCharHeight();
          g.drawRect(startX + 2, y - charHeight, endX - startX - 4, charHeight);
        }
      }
    }
  }
  private void paintComposedTextDecoration(Graphics2D g) {
    TextRange composedTextRange = myEditor.getComposedTextRange();
    if (composedTextRange != null) {
      Point p1 =
          myView.offsetToXY(
              Math.min(composedTextRange.getStartOffset(), myDocument.getTextLength()),
              true,
              false);
      Point p2 =
          myView.offsetToXY(
              Math.min(composedTextRange.getEndOffset(), myDocument.getTextLength()), false, true);

      int y = p1.y + myView.getAscent() + 1;

      g.setStroke(IME_COMPOSED_TEXT_UNDERLINE_STROKE);
      g.setColor(myEditor.getColorsScheme().getDefaultForeground());
      UIUtil.drawLine(g, p1.x, y, p2.x, y);
    }
  }
  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 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 paintLineExtensions(Graphics2D g, int line, float x, int y) {
   Project project = myEditor.getProject();
   VirtualFile virtualFile = myEditor.getVirtualFile();
   if (project == null || virtualFile == null) return;
   for (EditorLinePainter painter : EditorLinePainter.EP_NAME.getExtensions()) {
     Collection<LineExtensionInfo> extensions =
         painter.getLineExtensions(project, virtualFile, line);
     if (extensions != null) {
       for (LineExtensionInfo info : extensions) {
         LineLayout layout =
             new LineLayout(myView, info.getText(), info.getFontType(), g.getFontRenderContext());
         g.setColor(info.getColor());
         x =
             paintLineLayoutWithEffect(
                 g, layout, x, y, info.getEffectColor(), info.getEffectType());
         int currentLineWidth = (int) x;
         EditorSizeManager sizeManager = myView.getSizeManager();
         if (currentLineWidth > sizeManager.getMaxLineWithExtensionWidth()) {
           sizeManager.setMaxLineWithExtensionWidth(line, currentLineWidth);
         }
       }
     }
   }
 }
  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);
        }
      }
    }
  }
  private void paintTextWithEffects(
      Graphics2D g, Rectangle clip, int startVisualLine, int endVisualLine) {
    final CharSequence text = myDocument.getImmutableCharSequence();
    final EditorImpl.LineWhitespacePaintingStrategy whitespacePaintingStrategy =
        myEditor.new LineWhitespacePaintingStrategy();
    int lineCount = myEditor.getVisibleLineCount();
    for (int visualLine = startVisualLine; visualLine <= endVisualLine; visualLine++) {
      int y = myView.visualLineToY(visualLine) + myView.getAscent();
      LineLayout prefixLayout = myView.getPrefixLayout();
      if (visualLine == 0 && prefixLayout != null) {
        g.setColor(myView.getPrefixAttributes().getForegroundColor());
        paintLineLayoutWithEffect(
            g,
            prefixLayout,
            0,
            y,
            myView.getPrefixAttributes().getEffectColor(),
            myView.getPrefixAttributes().getEffectType());
      }
      if (visualLine >= lineCount) break;

      final int[] currentLogicalLine = new int[] {-1};

      paintLineFragments(
          g,
          clip,
          visualLine,
          y,
          new LineFragmentPainter() {
            @Override
            public void paintBeforeLineStart(
                Graphics2D g, TextAttributes attributes, int columnEnd, float xEnd, int y) {
              SoftWrapModelImpl softWrapModel = myEditor.getSoftWrapModel();
              int symbolWidth =
                  softWrapModel.getMinDrawingWidthInPixels(SoftWrapDrawingType.AFTER_SOFT_WRAP);
              softWrapModel.paint(
                  g,
                  SoftWrapDrawingType.AFTER_SOFT_WRAP,
                  (int) xEnd - symbolWidth,
                  y - myView.getAscent(),
                  myView.getLineHeight());
            }

            @Override
            public void paint(
                Graphics2D g,
                VisualLineFragmentsIterator.Fragment fragment,
                int start,
                int end,
                TextAttributes attributes,
                float xStart,
                float xEnd,
                int y) {
              if (attributes != null && attributes.getForegroundColor() != null) {
                g.setColor(attributes.getForegroundColor());
                fragment.draw(g, xStart, y, start, end);
              }
              if (fragment.getCurrentFoldRegion() == null) {
                int logicalLine = fragment.getStartLogicalLine();
                if (logicalLine != currentLogicalLine[0]) {
                  whitespacePaintingStrategy.update(
                      text,
                      myDocument.getLineStartOffset(logicalLine),
                      myDocument.getLineEndOffset(logicalLine));
                  currentLogicalLine[0] = logicalLine;
                }
                paintWhitespace(
                    g, text, xStart, y, start, end, whitespacePaintingStrategy, fragment);
              }
              if (attributes != null
                  && hasTextEffect(attributes.getEffectColor(), attributes.getEffectType())) {
                paintTextEffect(
                    g, xStart, xEnd, y, attributes.getEffectColor(), attributes.getEffectType());
              }
            }

            @Override
            public void paintAfterLineEnd(
                Graphics2D g,
                Rectangle clip,
                IterationState iterationState,
                int columnStart,
                float x,
                int y) {
              int offset = iterationState.getEndOffset();
              SoftWrapModelImpl softWrapModel = myEditor.getSoftWrapModel();
              if (softWrapModel.getSoftWrap(offset) == null) {
                int logicalLine = myDocument.getLineNumber(offset);
                paintLineExtensions(g, logicalLine, x, y);
              } else {
                softWrapModel.paint(
                    g,
                    SoftWrapDrawingType.BEFORE_SOFT_WRAP_LINE_FEED,
                    (int) x,
                    y - myView.getAscent(),
                    myView.getLineHeight());
              }
            }
          });
    }
  }
 private void paintTextEffect(
     Graphics2D g, float xFrom, float xTo, int y, Color effectColor, EffectType effectType) {
   int xStart = (int) xFrom;
   int xEnd = (int) xTo;
   g.setColor(effectColor);
   if (effectType == EffectType.LINE_UNDERSCORE) {
     UIUtil.drawLine(g, xStart, y + 1, xEnd, y + 1);
   } else if (effectType == EffectType.BOLD_LINE_UNDERSCORE) {
     int height = JBUI.scale(Registry.intValue("editor.bold.underline.height", 2));
     g.fillRect(xStart, y, xEnd - xStart, height);
   } else if (effectType == EffectType.STRIKEOUT) {
     int y1 = y - myView.getCharHeight() / 2;
     UIUtil.drawLine(g, xStart, y1, xEnd, y1);
   } else if (effectType == EffectType.WAVE_UNDERSCORE) {
     UIUtil.drawWave(g, new Rectangle(xStart, y + 1, xEnd - xStart, myView.getDescent() - 1));
   } else if (effectType == EffectType.BOLD_DOTTED_LINE) {
     UIUtil.drawBoldDottedLine(
         g,
         xStart,
         xEnd,
         SystemInfo.isMac ? y : y + 1,
         myEditor.getBackgroundColor(),
         g.getColor(),
         false);
   }
 }