private int yPositionToOffset(int y, boolean beginLine) { if (myEditorScrollbarTop == -1 || myEditorTargetHeight == -1) { recalcEditorDimensions(); } final int safeY = Math.max(0, y - myEditorScrollbarTop); VisualPosition visual; if (myEditorSourceHeight < myEditorTargetHeight) { visual = myEditor.xyToVisualPosition(new Point(0, safeY)); } else { float fraction = Math.max(0, Math.min(1, safeY / (float) myEditorTargetHeight)); final int lineCount = myEditorSourceHeight / myEditor.getLineHeight(); visual = new VisualPosition((int) (fraction * lineCount), 0); } int line = myEditor.visualToLogicalPosition(visual).line; Document document = myEditor.getDocument(); if (line < 0) return 0; if (line >= document.getLineCount()) return document.getTextLength(); return beginLine ? document.getLineStartOffset(line) : document.getLineEndOffset(line); }