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.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.

Author:

Vaadin Ltd

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BasicRenderer(ValueProvider<SOURCE,TARGET> valueProvider)	Builds a new template 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	getTemplateForProperty(String property, Rendering<SOURCE> context)	Gets the template String for a given property.
protected String	getTemplatePropertyName(Rendering<SOURCE> context)	Gets the name of the property to be transmitted and used inside the template.
protected ValueProvider<SOURCE,TARGET>	getValueProvider()
Rendering<SOURCE>	render(Element container, DataKeyMapper<SOURCE> keyMapper, Element contentTemplate)	Handles the rendering of the model objects by using the given <template> element in the given container.

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

setComponentRendererTag, updateComponent

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

getEventHandlers, getValueProviders, render, setEventHandler, setProperty

Methods inherited from class java.lang.Object

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

Constructor Detail

BasicRenderer

protected BasicRenderer(ValueProvider<SOURCE,TARGET> valueProvider)

Builds a new template 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 Detail

getValueProvider

protected ValueProvider<SOURCE,TARGET> getValueProvider()

render

public Rendering<SOURCE> render(Element container,
                                DataKeyMapper<SOURCE> keyMapper,
                                Element contentTemplate)

Description copied from class: Renderer

Handles the rendering of the model objects by using the given <template> element in the given container.

Subclasses of Renderer usually override this method to provide additional features.

Overrides:

render in class ComponentRenderer<Component,SOURCE>

Parameters:

container - the element in which the template will be attached to, not null

keyMapper - mapper used internally to fetch items by key and to provide keys for given items. It is required when either event handlers or DataGenerator are supported

contentTemplate - the <template> element to be used for rendering in the container, not null

Returns:

the context of the rendering, that can be used by the components to provide extra customization

getTemplatePropertyName

protected String getTemplatePropertyName(Rendering<SOURCE> context)

Gets the name of the property to be transmitted and used inside the template. By default, it generates a unique name by using the class name of the renderer and the node id of the template element.

This method is only called when render(Element, DataKeyMapper, Element) is invoked.

Parameters:

context - the rendering context

Returns:

the property name to be used in template data bindings

See Also:

Rendering.getTemplateElement()

getTemplateForProperty

protected String getTemplateForProperty(String property,
                                        Rendering<SOURCE> context)

Gets the template String for a given property.

This method is only called when render(Element, DataKeyMapper, Element) is invoked.

Parameters:

property - the property to be used inside the template

context - the rendering context

Returns:

the template string to be used inside a <template> element

See Also:

getTemplatePropertyName(Rendering)

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