Remover Pessoa da Lista

Table of Contents

Artigos anteriores

A classe controller inclui uma ação para o botão remover.

O fx:id é para identificar o acesso ao botão. A onAction é o código para atribuir a ação do botão. Não há atalhos no teclado para acessar esse botão, então o mnemonicParsing tem o valor false.

Você não pode atualizar diretamente o SortedList, mas você pode aplicar mudanças a lista (ObservableList personList). A SortedList sempre mantém os elementos ordenados mesmo adicionando ou removendo itens.

@FXML
private void removeButtonAction(ActionEvent actionEvent){
personList.remove(selectedPerson);
}

Essa é ação para remover um item da lista.

Para evitar a chamada nula, utilize o código.

removeButton.disableProperty().bind(

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; listPersons.getSelectionModel().selectedItemProperty().isNull());

removeButton.disableProperty().bind(

        listPersons.getSelectionModel().selectedItemProperty().isNull());

Para aplicar essas mudanças no projeto tive que fazer a variável selectedPerson que está no método clicouNaPessoa ficar acessível a outros métodos da classe.

Para isso declarei a variável no começo da classe.

Programação do botão remover.

    public void removeButtonAction(javafx.event.ActionEvent actionEvent) {
        System.out.println("Remover>>> " + selectedPerson);
        removeButton.disableProperty().bind(
            listPersons.getSelectionModel().selectedItemProperty().isNull());
        obsPerson.remove(selectedPerson);
    }

public void removeButtonAction(javafx.event.ActionEvent actionEvent) {

System.out.println("Remover>>> " + selectedPerson);

removeButton.disableProperty().bind(

listPersons.getSelectionModel().selectedItemProperty().isNull());

obsPerson.remove(selectedPerson);

}

Note que na Figura 1 o botão remover e criar estão declarados e precisar ser feito para que funcione. Só declare o botão remover por enquanto, retire o createButton.

Se não escolher nenhuma pessoa na lista e clicar no botão Remover ele fica desabilitado.

Vou colocar os arquivos completos aqui das Scene1.fxml e FXMLController.java.

Scene1.fxml

&lt;?xml version="1.0" encoding="UTF-8"?>

&lt;?import javafx.geometry.*?>
&lt;?import javafx.scene.control.*?>
&lt;?import javafx.scene.layout.*?>
&lt;?import javafx.scene.text.*?>

&lt;AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="610.0" xmlns="http://javafx.com/javafx/10.0.2-internal" xmlns:fx="http://javafx.com/fxml/1" fx:controller="main.java.br.com.cursojavanow.FXMLController">
   &lt;children>
      &lt;SplitPane dividerPositions="0.29797979797979796" prefHeight="400.0" prefWidth="600.0">
        &lt;items>
            &lt;AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="326.0" prefWidth="169.0">
                &lt;children>
                    &lt;ListView fx:id="listPersons" layoutX="5.0" layoutY="11.0" onMouseClicked="#clicouNaPessoa" prefHeight="368.0" prefWidth="163.0" />
                &lt;/children>
            &lt;/AnchorPane>
          &lt;AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
               &lt;children>
                  &lt;GridPane prefHeight="398.0" prefWidth="417.0">
                    &lt;columnConstraints>
                      &lt;ColumnConstraints hgrow="SOMETIMES" maxWidth="202.0" minWidth="10.0" prefWidth="87.0" />
                      &lt;ColumnConstraints hgrow="SOMETIMES" maxWidth="330.0" minWidth="10.0" prefWidth="330.0" />
                    &lt;/columnConstraints>
                    &lt;rowConstraints>
                      &lt;RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                      &lt;RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                      &lt;RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                        &lt;RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                    &lt;/rowConstraints>
                     &lt;children>
                        &lt;Label prefHeight="17.0" prefWidth="59.0" text="Nome">
                           &lt;padding>
                              &lt;Insets left="10.0" />
                           &lt;/padding>
                           &lt;font>
                              &lt;Font name="System Bold" size="12.0" />
                           &lt;/font>
                        &lt;/Label>
                        &lt;Label prefHeight="17.0" prefWidth="84.0" text="Sobrenome" GridPane.rowIndex="1">
                           &lt;padding>
                              &lt;Insets left="10.0" />
                           &lt;/padding>
                           &lt;font>
                              &lt;Font name="System Bold" size="12.0" />
                           &lt;/font>
                        &lt;/Label>
                        &lt;Label prefHeight="17.0" prefWidth="90.0" text="Anotações" GridPane.rowIndex="2">
                           &lt;padding>
                              &lt;Insets left="10.0" />
                           &lt;/padding>
                           &lt;font>
                              &lt;Font name="System Bold" size="12.0" />
                           &lt;/font>
                        &lt;/Label>
                        &lt;TextField  fx:id="firstnameTextField" GridPane.columnIndex="1">
                           &lt;opaqueInsets>
                              &lt;Insets />
                           &lt;/opaqueInsets>
                           &lt;GridPane.margin>
                              &lt;Insets right="10.0" />
                           &lt;/GridPane.margin>&lt;/TextField>
                        &lt;TextField fx:id="lastnameTextField" GridPane.columnIndex="1" GridPane.rowIndex="1">
                           &lt;GridPane.margin>
                              &lt;Insets right="10.0" />
                           &lt;/GridPane.margin>&lt;/TextField>
                        &lt;TextArea fx:id="notesTextArea" prefHeight="200.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.rowIndex="2">
                           &lt;GridPane.margin>
                              &lt;Insets right="10.0" />
                           &lt;/GridPane.margin>&lt;/TextArea>
                        &lt;ButtonBar prefHeight="40.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="3" GridPane.valignment="CENTER">
                          &lt;buttons>
                              &lt;Button mnemonicParsing="false" text="Novo" />
                              &lt;Button mnemonicParsing="false" text="Atualizar" />
                              &lt;Button fx:id="removeButton" mnemonicParsing="false"
                                      onAction="#removeButtonAction" text="Remover" />
                          &lt;/buttons>
                           &lt;GridPane.margin>
                              &lt;Insets right="70.0" />
                           &lt;/GridPane.margin>
                        &lt;/ButtonBar>
                     &lt;/children>
                  &lt;/GridPane>
               &lt;/children>
            &lt;/AnchorPane>
        &lt;/items>
      &lt;/SplitPane>
   &lt;/children>
&lt;/AnchorPane>

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.*?>

<?import javafx.scene.control.*?>

<?import javafx.scene.layout.*?>

<?import javafx.scene.text.*?>

<items>

</children>

</AnchorPane>

</columnConstraints>

</rowConstraints>

</padding>

<font>

</font>

</Label>

</padding>

<font>

</font>

</Label>

</padding>

<font>

</font>

</Label>

</opaqueInsets>

<GridPane.margin>

</GridPane.margin></TextField>

<GridPane.margin>

</GridPane.margin></TextField>

<GridPane.margin>

</GridPane.margin></TextArea>

<Button fx:id="removeButton" mnemonicParsing="false"

onAction="#removeButtonAction" text="Remover" />

</buttons>

<GridPane.margin>

</GridPane.margin>

</ButtonBar>

</children>

</GridPane>

</children>

</AnchorPane>

</items>

</SplitPane>

</children>

</AnchorPane>

FXMLController.java

package main.java.br.com.cursojavanow;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.*;
import javafx.scene.input.MouseEvent;
import main.java.br.com.cursojavanow.model.Person;

import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;

public class FXMLController implements Initializable{

    @FXML
    private ListView&lt;Person> listPersons;

    private List&lt;Person> personList = new ArrayList&lt;>();

    private ObservableList&lt;Person> obsPerson;

    private Person selectedPerson;

    @FXML
    private Button removeButton;

    @FXML
    private TextField firstnameTextField, lastnameTextField;

    @FXML
    private TextArea notesTextArea;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        Person p1 = new Person("Michel", "Medeiros", "Pessoa 1");
        Person p2 = new Person("Angela", "Ferraz", "Pessoa 2");
        Person p3 = new Person("Jean", "Medeiros", "Pessoa 3");
        personList.add(p1);
        personList.add(p2);
        personList.add(p3);

        obsPerson = FXCollections.observableArrayList(personList);

        listPersons.setItems(obsPerson.sorted());
        listPersons.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
    }

    public void clicouNaPessoa(MouseEvent mouseEvent) {
        listPersons.getSelectionModel().selectedItemProperty()
                .addListener((obsPerson, oldValue, newValue) -> {
                    System.out.println("OLD: " + oldValue + ",  NEW: " + newValue);
                    selectedPerson = newValue;
                    if (newValue != null) {
                        firstnameTextField.setText(selectedPerson.getFirstname());
                        lastnameTextField.setText(selectedPerson.getLastname());
                        notesTextArea.setText(selectedPerson.getNotes());
                    } else {
                        firstnameTextField.setText("");
                        lastnameTextField.setText("");
                        notesTextArea.setText("");
                    }
                });
    }

    public void removeButtonAction(javafx.event.ActionEvent actionEvent) {
        System.out.println("Remover>>> " + selectedPerson);
        removeButton.disableProperty().bind(
                listPersons.getSelectionModel().selectedItemProperty().isNull());
        obsPerson.remove(selectedPerson);
    }
}

package main.java.br.com.cursojavanow;

import javafx.collections.FXCollections;

import javafx.collections.ObservableList;

import javafx.fxml.FXML;

import javafx.fxml.Initializable;

import javafx.scene.control.*;

import javafx.scene.input.MouseEvent;

import main.java.br.com.cursojavanow.model.Person;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

import java.util.ResourceBundle;

public class FXMLController implements Initializable{

@FXML

private ListView<Person> listPersons;

private List<Person> personList = new ArrayList<>();

private ObservableList<Person> obsPerson;

private Person selectedPerson;

@FXML

private Button removeButton;

@FXML

private TextField firstnameTextField, lastnameTextField;

@FXML

private TextArea notesTextArea;

@Override

public void initialize(URL url, ResourceBundle resourceBundle) {

Person p1 = new Person("Michel", "Medeiros", "Pessoa 1");

Person p2 = new Person("Angela", "Ferraz", "Pessoa 2");

Person p3 = new Person("Jean", "Medeiros", "Pessoa 3");

personList.add(p1);

personList.add(p2);

personList.add(p3);

obsPerson = FXCollections.observableArrayList(personList);

listPersons.setItems(obsPerson.sorted());

listPersons.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

}

public void clicouNaPessoa(MouseEvent mouseEvent) {

listPersons.getSelectionModel().selectedItemProperty()

.addListener((obsPerson, oldValue, newValue) -> {

System.out.println("OLD: " + oldValue + ", NEW: " + newValue);

selectedPerson = newValue;

if (newValue != null) {

firstnameTextField.setText(selectedPerson.getFirstname());

lastnameTextField.setText(selectedPerson.getLastname());

notesTextArea.setText(selectedPerson.getNotes());

} else {

firstnameTextField.setText("");

lastnameTextField.setText("");

notesTextArea.setText("");

}

});

}

public void removeButtonAction(javafx.event.ActionEvent actionEvent) {

System.out.println("Remover>>> " + selectedPerson);

removeButton.disableProperty().bind(

listPersons.getSelectionModel().selectedItemProperty().isNull());

obsPerson.remove(selectedPerson);

}

Curso Java Para Iniciantes

Fonte: The Definitive Guide to Modern Java Clients with JavaFX

Artigos anteriores

Scene1.fxml

FXMLController.java

Organização da API Java

A Classe Math Parte 9

Aprendendo Alguns Aspectos do Java Através do Projeto HelloWorld

Para enviar seu comentário, preencha os campos abaixo:

Deixe um comentário Cancelar resposta

Seja o primeiro a comentar!

Damos valor à sua privacidade

Cookies estritamente necessários

Cookies de desempenho

Cookies de funcionalidade

Cookies de publicidade