Class Stave

Element implements a generic base class for VexFlow, with implementations of general functions and properties that can be inherited by all VexFlow elements.

The Element is an abstract class that needs to be subclassed to work. It handles style and text-font properties for the Element and any child elements, along with working with the Registry to create unique ids, but does not have any tools for formatting x or y positions or connections to a Stave.

Hierarchy

Constructors

Properties

options: Required<StaveOptions>
TEXT_FONT: Required<FontInfo> = ...

Default font for text. This is not related to music engraving. Instead, see Flow.setMusicFont(...fontNames) to customize the font for musical symbols placed on the score.

Accessors

  • get font(): string
  • Returns the CSS compatible font string for the text font.

    Returns string

  • set font(f): void
  • Provide a CSS compatible font string (e.g., 'bold 16px Arial') that will be applied to text (not glyphs).

    Parameters

    • f: string

    Returns void

  • get fontInfo(): Required<FontInfo>
  • Return a copy of the current FontInfo object.

    Returns Required<FontInfo>

  • set fontInfo(fontInfo): void
  • Parameters

    Returns void

  • get fontSize(): string
  • Returns string

    a CSS font-size string (e.g., '18pt', '12px', '1em').

  • set fontSize(size): void
  • The size is 1) a string of the form '10pt' or '16px', compatible with the CSS font-size property. or 2) a number, which is interpreted as a point size (i.e. 12 == '12pt').

    Parameters

    • size: string | number

    Returns void

  • get fontSizeInPixels(): number
  • Returns number

    the font size in px.

  • get fontSizeInPoints(): number
  • Returns number

    the font size in pt.

  • get fontStyle(): string
  • Returns string

    a CSS font-style string (e.g., 'italic').

  • set fontStyle(style): void
  • Parameters

    • style: string

    Returns void

  • get fontWeight(): string
  • Returns string

    a CSS font-weight string (e.g., 'bold'). As in CSS, font-weight is always returned as a string, even if it was set as a number.

  • set fontWeight(weight): void
  • Parameters

    • weight: string | number

    Returns void

  • get CATEGORY(): string
  • Returns string

  • get defaultPadding(): number
  • Returns number

  • get rightPadding(): number
  • Returns number

Methods

  • Adds a child Element to the Element, which lets it inherit the same style as the parent when setGroupStyle() is called.

    Examples of children are noteheads and stems. Modifiers such as Accidentals are generally not set as children.

    Note that StaveNote calls setGroupStyle() when setStyle() is called.

    Parameters

    Returns Stave

  • Add a class label (An element can have multiple class labels).

    Parameters

    • className: string

    Returns Stave

  • Add a clef to the stave.

    Example:

    stave.addClef('treble')

    Parameters

    • clef: string

      clef (treble|bass|...) see types

    • Optional size: string
    • Optional annotation: string
    • Optional position: number

    Returns Stave

  • Parameters

    • clef: string
    • Optional size: string
    • Optional annotation: string

    Returns Stave

  • Parameters

    • timeSpec: string
    • Optional customPadding: number

    Returns Stave

  • Add a key signature to the stave.

    Example: stave.addKeySignature('Db');

    Parameters

    • keySpec: string

      new key specification [A-G][b|#]?

    • Optional cancelKeySpec: string
    • Optional position: number

    Returns Stave

  • Parameters

    Returns Stave

  • Add a time signature to the stave

    Example:

    stave.addTimeSignature('4/4');

    Parameters

    • timeSpec: string

      time signature specification (C\||C|\d/\d)

    • Optional customPadding: number
    • Optional position: number

    Returns Stave

  • All drawing functions below need the context to be set.

    Returns Stave

  • Draw the element and all its sub-elements (ie.: Modifiers in a Stave) with the element's style (see getStyle() and setStyle())

    Returns void

  • Returns void

  • Return an attribute, such as 'id', 'type' or 'class'.

    Parameters

    • name: string

    Returns any

  • Returns number

  • Returns number

  • Returns number

  • Returns string

  • Returns undefined | string

  • Get the css string describing this Element's text font. e.g., 'bold 10pt Arial'.

    Returns string

  • Returns string

    a CSS font-size string (e.g., '18pt', '12px', '1em'). See Element.fontSizeInPixels or Element.fontSizeInPoints if you need to get a number for calculation purposes.

  • Returns number

  • Parameters

    • y: number

    Returns number

  • Return the measure number of this Stave.

    Returns number

  • Gets the pixels to shift from the beginning of the stave following the modifier at the provided index

    Parameters

    • index: number = 0

      The index from which to determine the shift

    Returns number

    The amount of pixels shifted

  • Parameters

    • Optional position: number
    • Optional category: string

    Returns StaveModifier[]

    array of StaveModifiers that match the provided position and category.

  • Returns number

  • Returns number

  • Returns number

  • Return associated SVGElement.

    Parameters

    • suffix: string = ''

    Returns undefined | SVGElement

  • Returns number

  • Returns number

  • Returns number

  • Returns number

  • Returns number

  • Returns number

  • Returns number

  • Returns number

  • Parameters

    • line: number = 0

    Returns number

  • Returns number

  • Parameters

    • line: number

    Returns number

    the y for the center of a staff line

  • Parameters

    • line: number

    Returns number

  • Parameters

    • line: number = 0

    Returns number

  • Check if it has a class label (An element can have multiple class labels).

    Parameters

    • className: string

    Returns boolean

  • Return the rendered status.

    Returns boolean

  • Remove a class label (An element can have multiple class labels).

    Parameters

    • className: string

    Returns Stave

  • Reset the text font to the style indicated by the static TEXT_FONT property. Subclasses can call this to initialize textFont for the first time.

    Returns void

  • Returns void

  • Set an attribute such as 'id', 'class', or 'type'.

    Parameters

    • name: string
    • value: undefined | string

    Returns Stave

  • Parameters

    • type: number

    Returns Stave

  • Parameters

    • clefSpec: string
    • Optional size: string
    • Optional annotation: string
    • Optional position: number

    Returns Stave

  • treat the stave as if the clef is clefSpec, but don't display the clef

    Parameters

    • clefSpec: string

    Returns Stave

  • Configure properties of the lines in the Stave

    Throws

    RuntimeError "StaveConfigError" When the specified line number is out of range of the number of lines specified in the constructor.

    Parameters

    • line_number: number

      The index of the line to configure.

    • line_config: StaveLineConfig

      An configuration object for the specified line.

    Returns Stave

  • Set the staff line configuration array for all of the lines at once.

    Throws

    RuntimeError "StaveConfigError" When the lines_configuration array does not have exactly the same number of elements as the num_lines configuration object set in the constructor.

    Parameters

    • lines_configuration: StaveLineConfig[]

      An array of line configuration objects. These objects are of the same format as the single one passed in to setLineConfiguration(). The caller can set null for any line config entry if it is desired that the default be used

    Returns Stave

  • Set default style for ledger lines.

    Parameters

    Returns void

  • Parameters

    • type: number

    Returns Stave

  • Parameters

    • clefSpec: string
    • Optional size: string
    • Optional annotation: string

    Returns Stave

  • Parameters

    • keySpec: string
    • Optional cancelKeySpec: string

    Returns Stave

  • Parameters

    • timeSpec: string
    • Optional customPadding: number

    Returns Stave

  • Set the element's text font family, size, weight, style (e.g., Arial, 10pt, bold, italic).

    This attribute does not determine the font used for musical Glyphs like treble clefs.

    Parameters

    • Optional font: string | FontInfo

      is 1) a FontInfo object or 2) a string formatted as CSS font shorthand (e.g., 'bold 10pt Arial') or 3) a string representing the font family (at least one of size, weight, or style must also be provided).

    • Optional size: string | number

      a string specifying the font size and unit (e.g., '16pt'), or a number (the unit is assumed to be 'pt').

    • Optional weight: string | number

      is a string (e.g., 'bold', 'normal') or a number (100, 200, ... 900).

    • Optional style: string

      is a string (e.g., 'italic', 'normal'). If no arguments are provided, then the font is set to the default font. Each Element subclass may specify its own default by overriding the static TEXT_FONT property.

    Returns Stave

  • Change the font size, while keeping everything else the same.

    Parameters

    • Optional size: string | number

    Returns Stave

  • Parameters

    • keySpec: string
    • Optional cancelKeySpec: string
    • Optional position: number

    Returns Stave

  • Set the measure number of this Stave.

    Parameters

    • measure: number

    Returns Stave

  • Parameters

    • x: number

    Returns Stave

  • Parameters

    • n: number

    Returns Stave

  • Set the rendered status.

    Parameters

    • rendered: boolean = true

    Returns Stave

  • Coda & Segno Symbol functions

    Parameters

    • type: number
    • yShift: number = 0

    Returns Stave

  • Parameters

    • section: string
    • y: number
    • xOffset: number = 0
    • Optional fontSize: number
    • drawRect: boolean = true

    Returns Stave

  • Set the element style used to render.

    Example:

    element.setStyle({ fillStyle: 'red', strokeStyle: 'red' });
    element.draw();

    Note: If the element draws additional sub-elements (ie.: Modifiers in a Stave), the style can be applied to all of them by means of the context:

    element.setStyle({ fillStyle: 'red', strokeStyle: 'red' });
    element.getContext().setFillStyle('red');
    element.getContext().setStrokeStyle('red');
    element.draw();

    or using drawWithStyle:

    element.setStyle({ fillStyle: 'red', strokeStyle: 'red' });
    element.drawWithStyle();

    Parameters

    Returns Stave

  • Parameters

    • text: string
    • position: number
    • options: {
          justification?: number;
          shift_x?: number;
          shift_y?: number;
      } = {}
      • Optional justification?: number
      • Optional shift_x?: number
      • Optional shift_y?: number

    Returns Stave

  • Parameters

    • timeSpec: string
    • Optional customPadding: number
    • Optional position: number

    Returns Stave

  • Parameters

    • type: number
    • number_t: string
    • y: number

    Returns Stave

  • Parameters

    • width: number

    Returns Stave

  • Parameters

    • x: number

    Returns Stave

  • Parameters

    • y: number

    Returns Stave

  • Use the modifier's getCategory() as a key for the order array. The retrieved value is used to sort modifiers from left to right (0 to to 3).

    Parameters

    Returns void

  • Parameters

    • spacing: number

    Returns number

  • Parameters

    Returns void