canvas-gui
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    Class CvsPanel

    A draggable rectangular panel that can be used to hold other controls.

    On creation the panel -

    1. has an opaque background (this is required for dragging).
    2. can be dragged in both X and Y directions.
    3. is constrained so the entire panel stays within the display area.

    If the background is transparent then the panel cannot be dragged. Panel movement in the display can be restricted with the draggable() and constrain() methods.

    It is recommended that the panel width and height should not exceed that of the display area (i.e. canvas).

    Index

    Accessors

    id isDraggable isEnabled isOpaque isVisible type

    Methods

    addChild config constrain corners disable draggable enable hide moveBy moveTo opaque removeChild scheme setAction setEnabled setVisible show transparent

    Accessors

    • get id(): string

      The unique identifier for this control.

      Returns string

    • get isDraggable(): boolean

      True if the panel can be dragged else false.

      Returns boolean

    • get isEnabled(): boolean

      This is true if the control can respond to UI events else false.

      Use enable() and disable() to enable and disable it.

      Returns boolean

    • get isOpaque(): boolean

      This is true if the control background is opaque else false.

      Use opaque() and transparent() display / hide the background.

      Returns boolean

    • get isVisible(): boolean

      This is true if the control is visible else false.

      Use hide() and show() to set visibility.

      Returns boolean

    • get type(): string

      The type name for this control.
      (type name = class name without the Cvs prefix)

      Returns string

    Methods

    • Add a child to this control using its relative position [rx, ry]. If rx and ry are not provided then it uses the values set in the child.

      Parameters

      • child: any

        is the actual control or its id

      • Optionalrx: number
      • Optionalry: number

      Returns any

      this control

    • Execute one or more configuration methods on this control.

      The parameter is a user defined object where each field is the name of a configuration method and its value is the method's parameter(s). Multiple parameters should be in an array and use 'undefined' if the method expects no parameters.

      This object will change the color scheme, text size and alignment, it will also make sure it is visible.

      { scheme : 'red', textSize : 12, textAlign: ['left', 'top'], show : undefined }
      If the field name does not exist or not a valid function of this control it will be silently ignored.

      There is no error checking on the parameters, it is up to the user to ensure they are valid for the control method.

      Parameters

      • cfg: any

        the configuration object

      Returns CvsPanel

      this control

    • Panel position can be constrained horizontally and vertically so that it fits within the outside the display area.

      Parameters

      • limitX: boolean = true
      • limitY: boolean = true

      Returns CvsPanel

      this control

    • Get or set the corner radii used for this control.

      To set the radii the parameters must be one of the following

      • an array of 4 numbers.
      • a comma seperated list of 4 numbers.
      • a single number to be used for all 4 radii.

      If no parameter is passed or does not match one of the above then an array of the currently used radii values.

      Parameters

      • ...c: any

        valid radii combination

      Returns number[] | CvsControl

      an array of the currently used radii values

    • Disables this control.

      Parameters

      • Optionalcascade: boolean

        if true disable child controls

      Returns CvsControl

      this control

    • Horizontal and vertical movement can be restricted based on the actual parameters. If either parameter is true then then the panel is considered 'draggable'.

      Parameters

      • allowX: boolean = true

        allow horizontal movement if true

      • allowY: boolean = true

        allow vertical movement if true

      Returns CvsPanel

      this control

    • Enables this control.

      Parameters

      • Optionalcascade: boolean

        if true enable child controls

      Returns CvsControl

      this control

    • Make this control invisible.

      Parameters

      • Optionalcascade: boolean

        if true hide any children

      Returns CvsControl

      this control

    • Move this control relative to current position.

      Parameters

      • x: number

        horizontal distance

      • y: number

        vertical distance

      Returns CvsPanel

      this control

    • Move this control to an absolute position.

      Parameters

      • x: number

        horizontal position

      • y: number

        vertical position

      Returns CvsPanel

      this control

    • Makes the controls background opaque. The actual color depends on the controls color scheme.

      The second parameter, alpha, is optional and controls the level of opaqueness from 0 - transparent to 255 - fully opaque (default value).

      Parameters

      • alpha: number = 255

        alpha value for controls background color.

      Returns CvsControl

      this control

    • Remove a child control from this one so that it stays in same screen position.

      Parameters

      • child: any

        the control to remove or its id

      Returns CvsPanel

      this control

    • If the name of a valid color scheme is provided then it will use it to display the control, non-existant scheme names will be ignored. In both cases this control is returned.

      If there is no parameter it returns the name of the current color scheme used by this control.

      Parameters

      • Optionalname: string

        the color scheme name e.g. 'blue'

      • Optionalcascade: boolean

        if true propogate scheme to all child controls.

      Returns ColorScheme | CvsControl

      this control or the control's color scheme

    • This sets the event handler to be used when this control fires an event. The parameter can take one of three forms:

      1. Arrow function definition
      2. Anonymous function definition
      3. Named function declaration

      Parameters

      • event_handler: Function

        the function to handle this control's events.

      Returns CvsPanel

      this control

    • An alternative to the enable / disable methods.

      Parameters

      • enable: boolean

        true / false

      • Optionalcascade: boolean

        true apply to all children

      Returns CvsPin

      this control

    • An alternative to the show / hide methods.

      Parameters

      • visible: boolean

        true / false

      • Optionalcascade: boolean

        if true hide children

      Returns CvsPin

      this control

    • Make this control visible.

      Parameters

      • Optionalcascade: boolean

        if true then show any children

      Returns CvsControl

      this control

    • Makes the controls background fully transparent.

      Returns CvsControl

      this control

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