Package com.vaadin.flow.data.renderer

Class BasicRenderer<SOURCE,TARGET>

java.lang.Object

com.vaadin.flow.data.renderer.Renderer<SOURCE>

com.vaadin.flow.data.renderer.LitRenderer<SOURCE>

com.vaadin.flow.data.renderer.ComponentRenderer<Component,SOURCE>

com.vaadin.flow.data.renderer.BasicRenderer<SOURCE,TARGET>

Type Parameters:

SOURCE - the type of the item used inside the renderer

TARGET - the type of the output object, such as Number or LocalDate

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

LocalDateRenderer, LocalDateTimeRenderer, NativeButtonRenderer, NumberRenderer

public abstract class BasicRenderer<SOURCE,TARGET>
extends ComponentRenderer<Component,SOURCE>

Abstract renderer used as the base implementation for renderers that outputs a simple value in the UI, such as NumberRenderer and LocalDateRenderer. For components that use a client-side renderer, such as Grid or ComboBox, the BasicRenderer works as a LitRenderer with a preconfigured template. It also implements the ComponentRenderer API, so components that use renderers server-side to generate content, such as RadioButtonGroup or ListBox, can use it as well.

Author:

Vaadin Ltd

See Also:

• Serialized Form

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BasicRenderer(ValueProvider<SOURCE,TARGET> valueProvider)	Builds a new renderer using the value provider as the source of values to be rendered.

Method Summary

Modifier and Type	Method	Description
Component	createComponent(SOURCE item)	Creates a component for a given object model item.
protected String	getFormattedValue(TARGET object)	Gets the String representation of the target object, to be used inside the template.
protected String	getTemplateExpression()	Returns the Lit template expression used to render items.
protected ValueProvider<SOURCE,TARGET>	getValueProvider()

Methods inherited from class com.vaadin.flow.data.renderer.ComponentRenderer

render, updateComponent

Methods inherited from class com.vaadin.flow.data.renderer.LitRenderer

getValueProviders, of, withFunction, withFunction, withProperty

Methods inherited from class com.vaadin.flow.data.renderer.Renderer

render

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BasicRenderer

protected BasicRenderer(ValueProvider<SOURCE,TARGET> valueProvider)

Builds a new renderer using the value provider as the source of values to be rendered.

Parameters:

valueProvider - the callback to provide a objects to the renderer, not null

Method Details

getTemplateExpression

protected String getTemplateExpression()

Description copied from class: LitRenderer

Returns the Lit template expression used to render items.

Overrides:

getTemplateExpression in class ComponentRenderer<Component,SOURCE>

Returns:

the template expression

getValueProvider

protected ValueProvider<SOURCE,TARGET> getValueProvider()

createComponent

public Component createComponent(SOURCE item)

Description copied from class: ComponentRenderer

Creates a component for a given object model item. Subclasses can override this method to provide specific behavior.

Overrides:

createComponent in class ComponentRenderer<Component,SOURCE>

Parameters:

item - the model item, possibly null

Returns:

a component instance representing the provided item

getFormattedValue

protected String getFormattedValue(TARGET object)

Gets the String representation of the target object, to be used inside the template.

By default it uses String.valueOf(Object) of the object.

Parameters:

object - the target object

Returns:

the string representation of the object