LoadingContainer Widget

The LoadingContainer widget is designed to simplify the process of displaying a loading indicator while content is being fetched or processed. It provides a convenient abstraction layer for managing loading states in your app, allowing developers to easily toggle between the loading state and the state where content is available.

Test in Kitchen Sink

Key Concepts

loadingWidget: Specify a widget to display while loading content. This can point to a custom widget, such as a column of shapes to represent what the loaded content might look like.
widget: This is the widget to display when content is available.
isLoading: This is typically an expression that returns true or false. When true, the loadingWidget is displayed. When false, the widget will display.
useShimmer: Enables a shining animation to indicate that the content is loading. The animation can be over a default shimmer or the loadingWidget if specified.
shimmerOptions: A nested object to customize the shimmer effect, including gradient colors, stops, and animation range.

Example

Typically LoadingContainer is used in combination with an API call so that you can show a loading state while waiting for the API to respond.


View:
  header:
    title: "API: Handle loading state"
 
  body:
    Column:
      styles:
        padding: 24
        gap: 8
      children:
        - Button:
            label: Invoke API
            onTap:
              executeActionGroup:
                actions:
                  - invokeAPI:
                      name: getData
                  - executeCode:
                      body: |
                        content.visible = true
 
        - LoadingContainer:
            id: content
            visible: false
            isLoading: ${ getData.isLoading }
            widget:
              Text:
                text: Data is ready
            loadingWidget:
              Shape:
                type: rectangle
                styles:
                  backgroundColor: grey
                  width: ${ device.width }
                  borderRadius: 8
                  height: 100
            useShimmer: true
            shimmerProperties:
              gradientColors:
                - 0xFFFF5733
                - 0xFF33FF57
                - 0xFF3357FF
              gradientStops: 
                - 0.0
                - 0.5
                - 1.0
              min: -0.5
              max: 1.5
 
API:
  getData:
    method: GET
    url: https://httpbin.org/delay/10

Reference

Properties

Property	Type	Description
isLoading	bool	Whether to display a loading widget. The default will be empty (without shimmer) or a default loading shimmer, unless a loadingWidget is specified.
useShimmer	bool	A shining animation to designate that the content is loading. The animation can be over a defaults shimmer or the loadingWidget if specified.
loadingWidget	object	The widget to render during the loading state (i.e. while isLoading is true).
widget	object	The widget to render as the content of this container.
shimmerOptions	object	A nested object to customize the shimmer effect. Includes the following sub-properties:

shimmerOptions

Property	Type	Description
gradientColors	list	A list of colors to be used in the shimmer effect’s gradient.
gradientStops	list	A list of stops that define the position of each color in the shimmer effect’s gradient.
min	double	The minimum value for the shimmer animation’s range.
max	double	The maximum value for the shimmer animation’s range.
shimmerSpeed	int	The speed of the shimmer animation in milliseconds.
shimmerEffect	enum	The direction of the shimmer effect. Options are `horizontal`, `vertical`, or `diagonal`.
padding	double	The padding around the shimmer effect.
tileMode	enum	The tileMode property in a gradient determines how the gradient repeats or extends beyond its original bounds, offering options like `clamp`, `mirror`, and `repeated` to control the visual effect.