Fader

Fader

new Fader(optionsopt)

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Mixes In:
Properties:
Name Type Attributes Default Description
options.value Number <optional>

The fader's position. This options is modified by user interaction.
options.layout String <optional>

The fader's layout. One out of top, left, right or bottom, defining the fader handles position in comparison to the scale.
options.bind_click Boolean <optional>
 false

If true, a click on the fader will move the handle to the pointed position.
options.bind_dblclick Boolean <optional>
 true

If true, a dblclick on the fader will reset the fader value to options.reset.
options.reset Number <optional>
 options.value

The reset value, which is used by the dblclick event and the Fader#reset method.
options.show_scale Boolean <optional>
 true

If true, a Scale is added to the fader.
options.show_value Boolean <optional>
 false

If true, a Value widget is added to the fader.
options.label String | Boolean <optional>
 false

Add a label to the fader. Set to false to remove the label from the DOM.
options.title String <optional>
 ""

A string to be set as title attribute on the main element to be displayed as tooltip. (Defined in Widget)
options.disabled Boolean <optional>
 false

Toggles the class .aux-disabled. By default it disables all pointer events on the widget via CSS to make it unusable to the user. (Defined in Widget)
options.active Boolean <optional>

Toggles the class .aux-inactive. (Defined in Widget)
options.visible Boolean <optional>

Toggles the class .aux-hide and .aux-show. This option also enables and disabled rendering by calling Widget#hide and Widget#show. (Defined in Widget)
options.needs_resize Boolean <optional>
 true

Set to true if the resize function shall be called before the next redraw. (Defined in Widget)
options.dblclick Boolean <optional>
 400

Set a time in milliseconds for triggering double click event. If 0, no double click events are fired. (Defined in Widget)
options.preset String <optional>

Set a preset. This string gets set as class attribute aux-preset-[preset]. If options.presets has a member of this name, all options of its option object are set on the Widget. Non-existent options are reset to the default. Defaults are updated on initialization and runtime. (Defined in Widget)
options.presets Object <optional>
 {}

An object with available preset specific options. Refer to options.preset for more information. (Defined in Widget)
options.notransitions_duration number <optional>
 500

A time in milliseconds until transitions are activated. (Defined in Widget)
options.scale String | Array.<Number> | function <optional>
 "linear"

The type of the scale. Either one of linear, decibel, log2, frequency or frequency-reverse; or an array containing a piece-wise linear scale; or a callback function of type Ranged~scale_cb. (Defined in Ranged)
options.reverse Boolean <optional>
 false

Reverse the scale of the range. (Defined in Ranged)
options.basis Number <optional>
 1

The size of the linear scale. Set to pixel width or height if used for drawing purposes or to 100 for percentages. (Defined in Ranged)
options.clip Boolean <optional>
 true

If true, snap() will clip values into the interval between min and max. (Defined in Ranged)
options.min Number <optional>
 0

Minimum value of the range. (Defined in Ranged)
options.max Number <optional>
 1

Maximum value of the range. (Defined in Ranged)
options.log_factor Number <optional>
 1

Used to overexpand logarithmic curves. 1 keeps the natural curve while values above 1 will overbend. (Defined in Ranged)
options.snap Number | Array.<number> <optional>
 0

Defines a virtual grid. If options.snap is a positive number, it is interpreted as the distance of grid points. Then, inside of the interval options.min ... options.max the grid points are options.base + n * options.snap where n is any integer. Any values outside of that interval are rounded to the biggest or smallest grid point, respectively. In order to define grids with non-uniform spacing, set options.snap to an Array of grid points. (Defined in Ranged)
options.base Number <optional>
 0

Base point. Used e.g. to mark 0dB on a fader from -96dB to 12dB. (Defined in Ranged)
options.step Number <optional>
 0

Step size. Used for instance by ScrollValue as the step size. (Defined in Ranged)
options.shift_up Number <optional>
 4

Multiplier for increased stepping speed, e.g. used by ScrollValue when simultaneously pressing 'shift'. (Defined in Ranged)
options.shift_down Number <optional>
 0.25

Multiplier for decreased stepping speed, e.g. used by ScrollValue when simultaneously pressing 'shift' and 'ctrl'. (Defined in Ranged)

Fader is a slidable control with a Scale next to it which can be both dragged and scrolled. Fader implements Ranged, Warning and GlobalCursor and inherits their options. A Label and a Value are available optionally.

Parameters:
Name Type Attributes Default Description
options Object <optional>
 { }

An object containing initial options.

Extends

Members

_bar :HTMLDivElement

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The DIV element of the bar. It can be used to e.g. visualize the value set in the backend or to draw a simple levelmeter.

Type:
  • HTMLDivElement

_handle :HTMLDivElement

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The handle of the fader. Has class .aux-handle.

Type:
  • HTMLDivElement

_pointer :HTMLDivElement

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The DIV element of the pointer. It can be used to e.g. visualize the value set in the backend.

Type:
  • HTMLDivElement

_track :HTMLDivElement

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The track for the handle. Has class .aux-track.

Type:
  • HTMLDivElement

drag :DragValue

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Instance of DragValue used for the handle interaction.

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element :HTMLDivElement

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The main DIV container. Has class .aux-fader.

Type:
  • HTMLDivElement

label :Label

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A Label to display a title.

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scale :Scale

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A Scale to display a scale next to the fader.

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scroll :ScrollValue

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Instance of ScrollValue used for the handle interaction.

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value :Value

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A Value to display the current value, offering a way to enter a value via keyboard.

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Methods

addChild(child)

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Registers a widget as a child widget. This method is used to build up the widget tree. It does not modify the DOM tree.

Parameters:
Name Type Description
child Widget

The child to add.
Fires:
  • Widget#event:child_added

addChildren(a)

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Registers an array of widgets as children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

addEventListener(event, func)

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Register an event handler.

Parameters:
Name Type Description
event string

The event descriptor.
func function

The function to call when the event happens.

allChildren()

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Returns an array of all children.

appendChild(child)

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Appends child.element to the widget element and registers child as a child widget.

Parameters:
Name Type Description
child Widget

The child widget to append.

appendChildren(children)

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Calls Widget#appendChild for an array of widgets.

Parameters:
Name Type Description
children Array.<Widget>

The child widgets to append.

delegateEvents(element) → {HTMLElement}

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Delegates all occuring DOM events of a specific DOM node to the widget. This way the widget fires e.g. a click event if someone clicks on the given DOM node.

Parameters:
Name Type Description
element HTMLElement

The element all native events of the widget should be bound to.
Fires:
Returns:

The element

Type
HTMLElement

destroy()

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Destroys all event handlers and the options object.

disableTansitions()

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Disable CSS transitions.

dispatchEvent(event, …args)

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Fires an event.

Parameters:
Name Type Attributes Description
event string

The event descriptor.
args * <repeatable>

Event arguments.

enableDraw()

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Schedules this widget for drawing.

Fires:

enableDrawChildren()

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Enables rendering for all children of this widget.

enableTransitions()

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Enable CSS transitions.

forceHide()

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Hide the widget immediately by applying the class aux-hide. Does not call disableDraw().

forceShow()

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Show the widget immediately by applying the class aux-show. Does not call enableDraw().

get(key)

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Get the value of an option.

Parameters:
Name Type Description
key string

The option name.

getDefault()

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Returns the default value of a given option. If the option does not exist, an exception is thrown.

getOptionType()

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Returns the type of an option. If the given option does not exist, 'undefined' is returned.

getStyle()

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Returns the computed style of this widget's DOM element.

hasEventListeners(event) → {boolean}

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Test if the event descriptor has some handler functions in the queue.

Parameters:
Name Type Description
event string

The event desriptor.
Returns:

True if the event has some handler functions in the queue, false if not.

Type
boolean

hidden()

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Returns the current hidden status.

hide()

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Hide the widget. This will result in the class aux-hide being applied to this widget in the next rendering step.

off(event, fun)

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Removes the given function from the event queue. If it is a native DOM event, it removes the DOM event listener as well.

Parameters:
Name Type Description
event string

The event descriptor.
fun function

The function to remove.

removeChild(child)

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Removes a child widget. Note that this method only modifies the widget tree and does not change the DOM.

Parameters:
Name Type Description
child Widget

The child to remove.
Fires:
  • Widget#event:child_removed

removeChildren(a)

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Removes an array of children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

reset()

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Resets the fader value to options.reset.

set(key, value)

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Sets an option.

Parameters:
Name Type Description
key string

The option name.
value

The option value.

setOptions(optionsopt)

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Merges a new options object into the existing one, including deep copies of objects. If an option key begins with the string "on" it is considered an event handler. In this case the value should be the handler function for the event with the corresponding name without the first "on" characters.

Parameters:
Name Type Attributes Default Description
options Object <optional>
 { }

An object containing initial options.

setStyle()

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Sets a CSS style property in this widget's DOM element.

show()

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Make the widget visible. This will apply the class aux-show during the next rendering step.

toggleHidden()

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Toggle the hidden status. This is equivalent to calling hide() or show(), depending on the current hidden status of this widget.

update(key, value)

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Conditionally sets an option unless it already has the requested value.

Parameters:
Name Type Description
key string

The name of the option.
value mixed

The value of the option.
Fires:

userset(key, value)

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Sets an option by user interaction. Emits the userset event. The userset event can be cancelled (if an event handler returns false), in which case the option is not set. Returns true if the option was set, false otherwise. If the option was set, it will emit a useraction event.

Parameters:
Name Type Description
key string

The name of the option.
value mixed

The value of the option.
Fires:
  • Base#event:userset
  • Base#event:useraction

visibleChildren()

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Returns an array of all visible children.

Events

delegated

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Is fired when an element is delegated.

Parameters:
Name Type Description
element HTMLElement | Array

The element which receives all native DOM events.
old_element HTMLElement | Array

The element which previously received all native DOM events.

destroy

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Is fired when a widget is destroyed.

doubleclick

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Is fired when the handle receives a double click.

Parameters:
Name Type Description
value number

The value of the Fader.

GenericDOMEvents

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Generic DOM events. Please refer to W3Schools for further details.

hide

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The hide event is emitted when a widget is hidden and is not rendered anymore. This happens both with browser visibility changes and also internally when using layout widgets such as Pager.

initialized

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Is fired when a widget is initialized.

redraw

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The redraw event is emitted when a widget is redrawn. This can be used to do additional DOM modifications to a Widget.

resize

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The resize event is emitted whenever a widget is being resized. This event can be used to e.g. measure its new size. Note that some widgets do internal adjustments after the resize event. If that is relevant, the Widget#resized event can be used instead.

resized

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The resized event is emitted after each rendering frame, which was triggered by a resize event.

scalechanged

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Is fired when the scale was changed.

Parameters:
Name Type Description
key string

The key of the option.
value mixed

The value to which it was set.

scalechanged

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Is fired when one or more or no files were selected by the user.

Parameters:
Name Type Description
key string

The key of the option.
value mixed

The value to which it was set.

set

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The set event is emitted when an option was set using the Widget#set method. The arguments are the option name and its new value.

Note that this happens both for user interaction and programmatical option changes.

set_[option]

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Is fired when an option is set.

Parameters:
Name Type Description
value mixed

The value of the option.

show

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The show event is emitted when a widget is shown and is being rendered. This is the counterpart to Widget#hide.

useraction

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The useraction event is emitted when a widget gets modified by user interaction. The event is emitted for the option value.

Parameters:
Name Type Description
name string

The name of the option which was changed due to the users action
value mixed

The new value of the option

visibility

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Is fired when the visibility state changes. The first argument is the visibility state, which is either true or false.