Class “ScrollView”

Object > NativeObject > Widget > Composite > ScrollView

A composite that allows its content to overflow either vertically (default) or horizontally. Since the ScrollView does not compute its own size, the width and height must be defined by the respective layout properties (e.g. either width or left and right must be specified).

Type:	`ScrollView extends Composite`
Constructor:	public
Singleton:	No
Namespace:	tabris
Direct subclasses:	None
JSX Support:	Element: `<ScrollView/>` Parent Elements: `<Canvas/>`, `<Composite/>`, `<Page/>`, `<RefreshComposite/>`, `<ScrollView/>`, `<Stack/>`, `<Tab/>` Child Elements: Any standalone widget element Text Content: Not supported

Examples

JavaScript

import {ScrollView, TextView, contentView} from 'tabris';

const scrollView = new ScrollView({layoutData: 'stretch'})
  .appendTo(contentView);

new TextView({text: 'Scrollable content'})
  .appendTo(scrollView);

Constructor

new ScrollView(properties?)

Parameter	Type	Description
properties	`Properties<ScrollView>`	Sets all key-value pairs in the properties object as widget properties. Optional.

Methods

scrollToX(offset, options?)

Scrolls to the given horizontal offset. Give {animate: false} as the second parameter to suppress the animation.

Parameter	Type	Description
offset	`number`	The offset to scroll to in dip.
options	`{ animate: boolean // defaults to true }`	An additional parameter object to control the animation. Optional.

Returns: this

scrollToY(offset, options?)

Scrolls to the given vertical offset. Give {animate: false} as the second parameter to suppress the animation.

Parameter	Type	Description
offset	`number`	The offset to scroll to in dip.
options	`{ animate: boolean // defaults to true }`	An parameter object to control the animation. Optional.

Returns: this

Properties

direction

Specifies the scrolling direction of the scroll composite.

Type:	`'vertical' \| 'horizontal'`
Default:	`'vertical'`
Settable:	By Constructor or JSX
Change Event:	Not supported

This property can only be set via constructor or JSX. Once set, it cannot change anymore.

offsetX

The horizontal scrolling position in dip.

Type:	`number`
Settable:	No
Change Event:	`offsetXChanged`

offsetY

The vertical scrolling position in dip.

Type:	`number`
Settable:	No
Change Event:	`offsetYChanged`

scrollXState

The scroll state of the ScrollView in horizontal direction. The following states are supported:

rest - no scrolling
drag the user moves the ScrollView content with his finger
scroll the user has flinged the content with his finger or the ScrollView is scrolling programmatically

Type:	`'rest' \| 'drag' \| 'scroll'`
Default:	`'rest'`
Settable:	No
Change Event:	`scrollXStateChanged`

scrollYState

The scroll state of the ScrollView in vertical direction. The following states are supported:

rest - no scrolling
drag the user moves the ScrollView content with his finger
scroll the user has flinged the ScrollView content with his finger or the ScrollView is scrolling programmatically

Type:	`'rest' \| 'drag' \| 'scroll'`
Default:	`'rest'`
Settable:	No
Change Event:	`scrollYStateChanged`

scrollbarVisible

Allows to show or hide scroll bar for current direction.

Type:	`boolean`
Default:	`true`
Settable:	Yes
Change Event:	`scrollbarVisibleChanged`

Events

scrollX

Fired while scrolling horizontally.

EventObject Type: ScrollViewScrollEvent<ScrollView>

Property	Type	Description
offset	`number`	Indicates the current horizontal scrolling position.

scrollY

Fired while scrolling vertically.

EventObject Type: ScrollViewScrollEvent<ScrollView>

Property	Type	Description
offset	`number`	Indicates the current vertical scrolling position.

Change Events

offsetXChanged

Fired when the offsetX property has changed.

EventObject Type: PropertyChangedEvent<ScrollView, number>

Property	Type	Description
value	`number`	The new value of offsetX.

offsetYChanged

Fired when the offsetY property has changed.

EventObject Type: PropertyChangedEvent<ScrollView, number>

Property	Type	Description
value	`number`	The new value of offsetY.

scrollbarVisibleChanged

Fired when the scrollbarVisible property has changed.

EventObject Type: PropertyChangedEvent<ScrollView, boolean>

Property	Type	Description
value	`boolean`	The new value of scrollbarVisible.

scrollXStateChanged

Fired when the scrollXState property has changed.

EventObject Type: PropertyChangedEvent<ScrollView, string>

Property	Type	Description
value	`string`	The new value of scrollXState.

scrollYStateChanged

Fired when the scrollYState property has changed.