LocalDateTableCell.java

/*
 * Copyright 2014 michael-simons.eu.
 *
 * 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 ac.simons.bikingFX.common;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Optional;
import javafx.beans.binding.Bindings;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.DatePicker;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.util.StringConverter;

import static java.time.format.FormatStyle.MEDIUM;

/**
 * Renderes a localized LocalDate
 * 
 * @author Michael J. Simons, 2014-10-17
 * @param <T>
 */
public class LocalDateTableCell<T> extends TableCell<T, LocalDate> {
    private static final DateTimeFormatter formatter = DateTimeFormatter.ofLocalizedDate(MEDIUM);
    private final DatePicker datePicker;
    
    public LocalDateTableCell(TableColumn<T, LocalDate> column) {	
	this.datePicker = new DatePicker();
	this.datePicker.setConverter(new StringConverter<LocalDate>() {
	    @Override
	    public String toString(LocalDate object) {
		String rv = null;
		if(object != null) {
		    rv = formatter.format(object);
		}		  
		return rv;
	    }

	    @Override
	    public LocalDate fromString(String string) {
		LocalDate rv = null;
		if(!Optional.ofNullable(string).orElse("").isEmpty()) {
		    rv = LocalDate.parse(string, formatter);
		}
		return rv;
	    }
	});	
	// Manage editing
	this.datePicker.getEditor().focusedProperty().addListener((observable, oldValue, newValue) -> {	   
	    if(newValue) {
		final TableView<T> tableView = getTableView();
		tableView.getSelectionModel().select(getTableRow().getIndex());
		tableView.edit(tableView.getSelectionModel().getSelectedIndex(), column);	    
	    }
	});
	this.datePicker.valueProperty().addListener((observable, oldValue, newValue) -> {
	    if(isEditing()) {
		commitEdit(newValue);
	    }
	});	
	
	// Bind this cells editable property to the whole column
	editableProperty().bind(column.editableProperty());
	// and then use this to configure the date picker
	contentDisplayProperty().bind(Bindings
		.when(editableProperty())
                    .then(ContentDisplay.GRAPHIC_ONLY)
                    .otherwise(ContentDisplay.TEXT_ONLY)
	);	
    }
    
    @Override
    protected void updateItem(LocalDate item, boolean empty) {
	super.updateItem(item, empty);
		
	if(empty) {
	    setText(null);
	    setGraphic(null);
	} else {
	    // Datepicker can handle null values
	    this.datePicker.setValue(item);	    
	    setGraphic(this.datePicker);
	    if(item == null) {
		setText(null);
	    } else {
		setText(formatter.format(item));
	    }
	}	
    }
}