SlideshowWithPlayControls

Slideshow with buttons for controlling playback
Mountain lake Terraced farm Winter trees Forest river Red panda
Demo: Play controls let the user go back, pause/resume, or forward

Overview

This component is simply a Slideshow that uses PlayControlsMixin to add buttons for controlling slideshow playback.

For a variation that uses standard carousel controls (arrows and page dots), see CarouselSlideshow. For a more basic variation with no controls, see Slideshow.

API

Ancestry: SlideshowWithPlayControls → SlideshowCrossfadeStageModesReactiveElement → HTMLElement

Built with mixins AriaListMixin, AttributeMarshallingMixin, DirectionSelectionMixin, EffectMixin, FocusVisibleMixin, KeyboardDirectionMixin, KeyboardMixin, LanguageDirectionMixin, PlayControlsMixin, ReactiveMixin, ShadowTemplateMixin, SingleSelectionMixin, SlotItemsMixin, SwipeDirectionMixin, TimerSelectionMixin, TouchSwipeMixin, and TrackpadSwipeMixin.

The element defines the following shadow parts:

  • control-button: any of the buttons that control playback, default type is SeamlessButton
  • control-icon: any of the icons shown in the control buttons
  • next-button: the button that navigates to the next item
  • next-icon: icon for the next button
  • paused-icon: icon shown when the element is paused
  • playing-icon: icon shown when the element is playing
  • previous-button: the button that navigates to the previous item
  • previous-icon: icon for the previous button

canSelectNext property

True if the selection can be moved to the next item, false if not (the selected item is the last item in the list).

Type: boolean

Defined by SingleSelectionMixin

canSelectPrevious property

True if the selection can be moved to the previous item, false if not (the selected item is the first one in the list).

Type: boolean

Defined by SingleSelectionMixin

controlButtonPartType property

The class, tag, or template used to create the control-button parts – the play control buttons.

Type: (component class constructor)|HTMLTemplateElement|string

Default: SeamlessButton

Defined by PlayControlsMixin

[internal.contentSlot] property

Defined by SlotContentMixin

[internal.defaultState] property

The default state for the component. This can be extended by mixins and classes to provide additional default state.

Type: State

Defined by ReactiveMixin

[internal.goDown]() method

Invokes selectNext to select the next item.

Defined by DirectionSelectionMixin

[internal.goEnd]() method

Invokes selectLast to select the next item.

Defined by DirectionSelectionMixin

[internal.goLeft]() method

Invokes selectPrevious to select the previous item.

If the element has a rightToLeft property and it is true, then this selects the next item.

Defined by DirectionSelectionMixin

[internal.goNext]() method

Invokes selectNext to select the next item.

Defined by DirectionSelectionMixin

[internal.goPrevious]() method

Invokes selectPrevious to select the previous item.

Defined by DirectionSelectionMixin

[internal.goRight]() method

Invokes selectNext to select the next item.

If the element has a rightToLeft property and it is true, then this selects the previous item.

Defined by DirectionSelectionMixin

[internal.goStart]() method

Invokes selectFirst to select the first item.

Defined by DirectionSelectionMixin

[internal.goUp]() method

Invokes selectPrevious to select the previous item.

Defined by DirectionSelectionMixin

[internal.ids] property

A convenient shortcut for looking up an element by ID in the component's Shadow DOM subtree.

Example: if component's template contains a shadow element <button id="foo">, you can use the reference this[internal.ids].foo to obtain the corresponding button in the component instance's shadow tree. The ids property is simply a shorthand for getElementById, so this[internal.ids].foo is the same as this.shadowRoot.getElementById('foo').

Type: object

Defined by ShadowTemplateMixin

[internal.itemMatchesState](item, state) method

Returns true if the given item should be shown in the indicated state.

Parameters:

  • item: HTMLElement|SVGElement
  • state: PlainObject

Returns: boolean

Defined by ContentItemsMixin

[internal.keydown]() method

See the symbols documentation for details.

Defined by KeyboardMixin

[internal.render](changed) method

Render the indicated changes in state to the DOM.

The default implementation of this method does nothing. Override this method in your component to update your component's host element and any shadow elements to reflect the component's new state. See the rendering example.

Be sure to call super in your method implementation so that your component's base classes and mixins have a chance to perform their own render work.

Parameters:

  • changed: objectdictionary of flags indicating which state members have changed since the last render

Defined by ReactiveMixin

[internal.renderChanges]() method

Render any pending component changes to the DOM.

This method does nothing if the state has not changed since the last render call.

ReactiveMixin will invoke this method following a setState call; you should not need to invoke this method yourself.

This method invokes all internal render methods, then invokes componentDidMount (for first render) or componentDidUpdate (for subsequent renders).

Defined by ReactiveMixin

[internal.setState](changes) method

Update the component's state by merging the specified changes on top of the existing state. If the component is connected to the document, and the new state has changed, this returns a promise to asynchronously render the component. Otherwise, this returns a resolved promise.

Parameters:

  • changes: objectthe changes to apply to the element's state

Returns: Promise - resolves when the new state has been rendered

Defined by ReactiveMixin

[internal.state] property

The component's current state.

The returned state object is immutable. To update it, invoke internal.setState.

It's extremely useful to be able to inspect component state while debugging. If you append ?elixdebug=true to a page's URL, then ReactiveMixin will conditionally expose a public state property that returns the component's state. You can then access the state in your browser's debug console.

Type: State

Defined by ReactiveMixin

[internal.swipeDown]() method

Invokes the internal.goUp method.

Defined by SwipeDirectionMixin

[internal.swipeLeft]() method

Invokes the internal.goRight method.

Defined by SwipeDirectionMixin

[internal.swipeRight]() method

Invokes the internal.goLeft method.

Defined by SwipeDirectionMixin

[internal.swipeTarget] property

Type: HTMLElement

Defined by TouchSwipeMixin

[internal.swipeUp]() method

Invokes the internal.goDown method.

Defined by SwipeDirectionMixin

items property

The current set of items drawn from the element's current state.

Type: Array.|null

Defined by ContentItemsMixin

items-changed event

Raised when the items property changes.

Defined by ContentItemsMixin

pause() method

Pause automatic progression of the selection.

Defined by TimerSelectionMixin

play() method

Begin automatic progression of the selection.

Defined by TimerSelectionMixin

playing property

True if the element is playing.

Type: boolean

Default: false

Defined by TimerSelectionMixin

selected-index-changed event

Raised when the selectedIndex property changes.

Defined by SingleSelectionMixin

selectedIndex property

The index of the currently-selected item, or -1 if no item is selected.

Type: number

Defined by SingleSelectionMixin

selectedItem property

The currently-selected item, or null if no item is selected.

Type: Element

Defined by SingleSelectionMixin

selectFirst() method

Select the first item in the list.

Returns: Boolean True if the selection changed, false if not.

Defined by SingleSelectionMixin

selection-effect-finished event

This event is raised when changing the selection and the selection effect has completed.

The order of events when the selectedIndex property changes is therefore: selected-index-changed (occurs immediately when the index changes), followed by selection-effect-finished (occurs some time later).

Defined by CrossfadeStage

selectionRequired property

True if the list should always have a selection (if it has items).

Type: boolean

Default: false

Defined by SingleSelectionMixin

selectionTimerDuration property

The time in milliseconds that will elapse after the selection changes before the selection will be advanced to the next item in the list.

Type: number

Default: 1000 (1 second)

Defined by TimerSelectionMixin

selectionWraps property

True if selection navigations wrap from last to first, and vice versa.

Type: boolean

Default: false

Defined by SingleSelectionMixin

selectLast() method

Select the last item in the list.

Returns: Boolean True if the selection changed, false if not.

Defined by SingleSelectionMixin

selectNext() method

Select the next item in the list.

If the list has no selection, the first item will be selected.

Returns: Boolean True if the selection changed, false if not.

Defined by SingleSelectionMixin

selectPrevious() method

Select the previous item in the list.

If the list has no selection, the last item will be selected.

Returns: Boolean True if the selection changed, false if not.

Defined by SingleSelectionMixin

suppressFocusVisibility() method

Temporarily suppress visibility of the keyboard focus until the next keydown event.

This can be useful in components like Menu that actively manage where the focus is in response to mouse hover activity. If the user uses the keyboard to invoke a menu, then changes to using the mouse, it can be distracting to see the focus indicator moving as well. In such situations, the component can invoke this method (e.g., in response to mousemove) to temporarily suppress focus visibility.

Defined by FocusVisibleMixin

wrap(original) method

Destructively wrap a node with elements for play controls.

Parameters:

  • original: Nodethe element that should be wrapped by play controls

Defined by PlayControlsMixin