GitHub найти функцию файла
in Framework гид имеетстраница, описывающая, как использовать Column Renderers вВаадин Грид, А такжеэта страница описывает реализацию рендеров, но слишком коротко.Я хочу реализовать
дополнить частичный набор визуализаторов java.time, добавленных в Vaadin 8.1. Рендереры были добавлены дляInstantRenderer но не дляLocalDate & LocalDateTime, а такжеInstant, OffsetDateTime, Для меняZonedDateTime Renderer Я в настоящее время просто применяю текущий часовой пояс по умолчанию (Instant) чтобы получитьZoneId на котором я называюZonedDateTime метод. Можно было бы сделать больше, но это только начало.toStringТак что мой код должен быть очень похож на приведенный
, Я пытаюсь следовать этому коду в качестве руководства.LocalDateTimeRendererПри поиске исходного кода Vaadin и чтении документа, кажется, мне нужны три куска исходного кода:
( похожий на
InstantRenderer ( похожий наLocalDateTimeRenderer )InstantRendererConnector ( похожий наLocalDateTimeRendererConnector )InstantRendererStateЯ сделал это, и все это компилируется. Но моя таблица не отображается, все, что я получаю, это пустое белое поле на странице. Ошибки не появляются на консоли или журналах. Если я уберу свое использование моегоLocalDateTimeRendererState )и отступить кInstantRenderer объекты будут отображаться по умолчанию их собственныхInstant методы, все хорошо, и таблица выглядит так, как ожидалось. Я знаю, что виноват мой пользовательский рендер.toStringЯ новичок, когда дело доходит до "серверной" против "клиентской" Vaadin.
➠ Есть ли какая-то упаковка, которую мне нужно выполнить? В настоящее время у меня есть три класса в моем проекте Vaadin наряду с
исходный файл.MyUIMissing Я что-то пропустил?
Я создаю экземпляр моего средства визуализации, вызывая конструктор no-arg:
Вот мои три файла, перечисленные выше, взятые почти полностью из исходного кода Vaadin.
this.entriesGrid
.addColumn( Entry::getStart )
.setCaption( "Start" )
.setRenderer( new InstantRenderer( ) )
;
Источник на BitBucket
InstantRenderer/*
* By Basil Bourque. Taken almost entirely from source code published by Vaadin Ltd.
*
* --------
*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.basil.timepiece;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.Locale;
import elemental.json.JsonValue;
/**
* A renderer for presenting {@code Instant} objects.
*
* @author Vaadin Ltd
* @since 8.1
*/
public class InstantRenderer
extends com.vaadin.ui.renderers.AbstractRenderer< Object, Instant >
{
private DateTimeFormatter formatter;
private boolean getLocaleFromGrid;
private ZoneId zoneId = ZoneId.systemDefault(); // Basil Bourque.
/**
* Creates a new InstantRenderer.
* <p>
* The renderer is configured to render with the grid's locale it is
* attached to, with the format style being {@code FormatStyle.LONG} for the
* date and {@code FormatStyle.SHORT} for time, with an empty string as its
* null representation.
*
* @see <a href=
* "https://docs.oracle.com/javase/8/docs/api/java/time/format/FormatStyle.html#LONG">
* FormatStyle.LONG</a>
* @see <a href=
* "https://docs.oracle.com/javase/8/docs/api/java/time/format/FormatStyle.html#SHORT">
* FormatStyle.SHORT</a>
*/
public InstantRenderer ()
{
this( DateTimeFormatter.ofLocalizedDateTime( FormatStyle.LONG , FormatStyle.SHORT ) , "" );
getLocaleFromGrid = true;
}
/**
* Creates a new InstantRenderer.
* <p>
* The renderer is configured to render with the given formatter, with the
* empty string as its null representation.
*
* @param formatter the formatter to use, not {@code null}
* @throws IllegalArgumentException if formatter is null
*/
public InstantRenderer ( DateTimeFormatter formatter )
{
this( formatter , "" );
}
/**
* Creates a new InstantRenderer.
* <p>
* The renderer is configured to render with the given formatter.
*
* @param formatter the formatter to use, not {@code null}
* @param nullRepresentation the textual representation of the {@code null} value
* @throws IllegalArgumentException if formatter is null
*/
public InstantRenderer ( DateTimeFormatter formatter , String nullRepresentation )
{
super( Instant.class , nullRepresentation );
if ( formatter == null )
{
throw new IllegalArgumentException( "formatter may not be null" );
}
this.formatter = formatter;
}
/**
* Creates a new InstantRenderer.
* <p>
* The renderer is configured to render with the given string format, as
* displayed in the grid's locale it is attached to, with an empty string as
* its null representation.
*
* @param formatPattern the format pattern to format the date with, not {@code null}
* @throws IllegalArgumentException if format pattern is null
* @see <a href=
* "https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#patterns">
* Format Pattern Syntax</a>
*/
public InstantRenderer ( String formatPattern )
{
this( formatPattern , Locale.getDefault() );
getLocaleFromGrid = true;
}
/**
* Creates a new InstantRenderer.
* <p>
* The renderer is configured to render with the given string format, as
* displayed in the given locale, with an empty string as its null
* representation.
*
* @param formatPattern the format pattern to format the date with, not {@code null}
* @param locale the locale to use, not {@code null}
* @throws IllegalArgumentException if format pattern is null
* @throws IllegalArgumentException if locale is null
* @see <a href=
* "https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#patterns">
* Format Pattern Syntax</a>
*/
public InstantRenderer ( String formatPattern , Locale locale )
{
this( formatPattern , locale , "" );
}
/**
* Creates a new InstantRenderer.
* <p>
* The renderer is configured to render with the given string format, as
* displayed in the given locale.
*
* @param formatPattern the format pattern to format the date with, not {@code null}
* @param locale the locale to use, not {@code null}
* @param nullRepresentation the textual representation of the {@code null} value
* @throws IllegalArgumentException if format pattern is null
* @throws IllegalArgumentException if locale is null
* @see <a href=
* "https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#patterns">
* Format Pattern Syntax</a>
*/
public InstantRenderer ( String formatPattern , Locale locale , String nullRepresentation )
{
super( Instant.class , nullRepresentation );
if ( formatPattern == null )
{
throw new IllegalArgumentException( "format pattern may not be null" );
}
if ( locale == null )
{
throw new IllegalArgumentException( "locale may not be null" );
}
formatter = DateTimeFormatter.ofPattern( formatPattern , locale );
}
@Override
public JsonValue encode ( Instant value )
{
String dateString;
if ( value == null )
{
dateString = this.getNullRepresentation();
} else if ( this.getLocaleFromGrid )
{
if ( null == this.getParentGrid() )
{
throw new IllegalStateException(
"Could not find a locale to format with: "
+ "this renderer should either be attached to a grid "
+ "or constructed with locale information" );
}
ZonedDateTime zdt = value.atZone( this.zoneId ); // Basil Bourque.
Locale locale = this.getParentGrid().getLocale();
dateString = zdt.format( formatter.withLocale( locale ) );
} else
{
ZonedDateTime zdt = value.atZone( this.zoneId ); // Basil Bourque.
dateString = zdt.format( formatter );
}
return encode( dateString , String.class );
}
@Override
protected InstantRendererState getState ()
{
InstantRendererState s = ( InstantRendererState ) super.getState();
return s;
}
@Override
protected InstantRendererState getState ( boolean markAsDirty )
{
InstantRendererState s = ( InstantRendererState ) super.getState( markAsDirty );
return s;
}
}
InstantRendererConnector/*
* By Basil Bourque. Taken almost entirely from source code published by Vaadin Ltd.
*
* --------
*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.basil.timepiece;
import com.vaadin.shared.ui.Connect;
/**
* A connector for InstantRenderer.
* <p>
* The server-side Renderer operates on {@code Instant}s, but the data is
* serialized as a string, and displayed as-is on the client side. This is to be
* able to support the server's locale.
*
* @author Vaadin Ltd
* @since 8.1
*/
@Connect( InstantRenderer.class )
public class InstantRendererConnector extends com.vaadin.client.connectors.grid.TextRendererConnector
{
@Override
public InstantRendererState getState ()
{
return ( InstantRendererState ) super.getState();
}
}
InstantRendererState/*
* By Basil Bourque. Taken almost entirely from source code published by Vaadin Ltd.
*
* --------
*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.basil.timepiece;
/**
* Shared state of InstantRenderer.
*
* @author Vaadin Ltd
* @since 8.1
*/
public class InstantRendererState extends com.vaadin.shared.ui.grid.renderers.TextRendererState
{
// This code intentionally left blank.
}
завершить управляемый Maven проект на BitBucket, все необходимые файлы для визуализации столбцов для, а такжеInstant, OffsetDateTimeЗапрос функцииZonedDateTime.