UITableView - Migliore modifica tramite binding?

Question

Collegato a domanda: JavaFX 2: Save edit in TableCell

Sembra essere assegnare di idraulici richiesti per stabilire un Tableview modificabile - vale a dire la cattura tutti gli eventi per ogni textField (maturata/focus perduto, tabulazione lontano dalla textField, commettere modifiche dalla textField al modello di dati sottostante) e sovrascrive diversi metodi nel TableCell.

Il comportamento predefinito per stabilire la modifica - doppio clic in una cella - non mi sembra familiare o gli utenti di un controllo tabella standard. Voglio solo fare clic sulla cella e iniziare a digitare, per la maggior parte.

Esistono esempi completamente implementati? Aggiungi i tuoi, o commenti per progettare una creatura del genere.

Answer 1

Invece di rispondere a diversi eventi a livello TableCell e TableColumn di avviare la modifica di una cella, e con successo aggiornare i dati di base della cellula - invece mettiamo a disposizione una fabbrica di cella personalizzato e l'override del metodo updateItem() nella cella e 'legano' la proprietà text del textField direttamente alla proprietà all'interno del nostro modello di dati per lo (in questo caso uno StringProperty). Ho aggiunto altre estetiche per rendere il campo di testo all'interno della cellula senza soluzione di continuità e rispondere a stati di hover e focalizzati.

Tutta la magia avviene nel metodo updateItem(). Dovete tenere traccia del textField e ciò che è destinato a - TableCells tableView API 'ricicli' per ridurre il consumo di memoria:

@Override 
    protected void updateItem(String item, boolean empty) { 
     super.updateItem(item, empty);   
     if(!empty) { 
     // Show the Text Field 
     this.setContentDisplay(ContentDisplay.GRAPHIC_ONLY); 

     // Retrieve the actual String Property that should be bound to the TextField 
     // If the TextField is currently bound to a different StringProperty 
     // Unbind the old property and rebind to the new one 
     ObservableValue<String> ov = getTableColumn().getCellObservableValue(getIndex()); 
     SimpleStringProperty sp = (SimpleStringProperty)ov; 

     if(this.boundToCurrently==null) { 
      this.boundToCurrently = sp; 
      this.textField.textProperty().bindBidirectional(sp); 
     } 
     else { 
      if(this.boundToCurrently != sp) { 
       this.textField.textProperty().unbindBidirectional(this.boundToCurrently); 
       this.boundToCurrently = sp; 
       this.textField.textProperty().bindBidirectional(this.boundToCurrently); 
      } 
     } 
     System.out.println("item=" + item + " ObservableValue<String>=" + ov.getValue()); 
     //this.textField.setText(item); // No longer need this!!! 
     } 
     else { 
     this.setContentDisplay(ContentDisplay.TEXT_ONLY); 
     } 
    } 

Ecco un esempio completo di una tabella con 4 colonne, il tutto legato alla campo di testo sottostante. Non appena digiti il ​​textField, il modello di dati sottostante nell'elenco Observable viene aggiornato:

package tablevieweditingwithbinding; 

import javafx.application.Application; 
import javafx.beans.property.ObjectProperty; 
import javafx.beans.property.SimpleObjectProperty; 
import javafx.beans.property.SimpleStringProperty; 
import javafx.beans.property.StringProperty; 
import javafx.beans.value.ChangeListener; 
import javafx.beans.value.ObservableValue; 
import javafx.collections.FXCollections; 
import javafx.collections.ObservableList; 
import javafx.event.ActionEvent; 
import javafx.event.EventHandler; 
import javafx.geometry.Insets; 
import javafx.geometry.Pos; 
import javafx.scene.Node; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.scene.control.*; 
import javafx.scene.control.cell.PropertyValueFactory; 
import javafx.scene.layout.BorderPane; 
import javafx.scene.layout.HBox; 
import javafx.stage.Stage; 
import javafx.util.Callback; 

/** 
* 
* @author jKaufmann 
*/ 
public class TableViewEditingWithBinding extends Application { 
    public static class TableData { 
    private SimpleStringProperty firstName, lastName, phone, email; 
    private ObjectProperty<SimpleStringProperty> firstNameObject; 

    public TableData(String firstName, String lastName, String phone, String email) { 
     this.firstName = new SimpleStringProperty(firstName); 
     this.firstNameObject = new SimpleObjectProperty(firstNameObject); 
     this.lastName = new SimpleStringProperty(lastName); 
     this.phone = new SimpleStringProperty(phone); 
     this.email = new SimpleStringProperty(email); 
    } 

    public String getEmail() { 
     return email.get(); 
    } 
    public void setEmail(String email) { 
     this.email.set(email); 
    } 
    public SimpleStringProperty emailProperty() { return email; } 

    public String getFirstName() { 
     return firstName.get(); 
    } 
    public SimpleStringProperty getFirstNameObject() { 
     return firstNameObject.get(); 
    } 
    public void setFirstNameObject(SimpleStringProperty firstNameObject) { 
     this.firstNameObject.set(firstNameObject); 
    } 
    public ObjectProperty<SimpleStringProperty> firstNameObjectProperty() { return firstNameObject; } 

    public void setFirstName(String firstName) { 
     this.firstName.set(firstName); 
    } 
    public SimpleStringProperty firstNameProperty() { 
     return firstName; 
    } 
    public String getLastName() { 
     return lastName.get(); 
    } 
    public void setLastName(String lastName) { 
     this.lastName.set(lastName); 
    } 
    public SimpleStringProperty lastNameProperty() { return lastName; } 

    public String getPhone() { 
     return phone.get(); 
    } 
    public void setPhone(String phone) { 
     this.phone.set(phone); 
    } 
    public SimpleStringProperty phoneProperty() { return phone; } 

    } 
    public static class TextFieldCellFactory 
    implements Callback<TableColumn<TableData,String>,TableCell<TableData,String>> { 

    @Override 
    public TableCell<TableData, String> call(TableColumn<TableData, String> param) { 
     TextFieldCell textFieldCell = new TextFieldCell(); 
     return textFieldCell; 
    } 

    public static class TextFieldCell extends TableCell<TableData,String> { 
     private TextField textField; 
     private StringProperty boundToCurrently = null; 

     public TextFieldCell() { 
      String strCss; 
      // Padding in Text field cell is not wanted - we want the Textfield itself to "be" 
      // The cell. Though, this is aesthetic only. to each his own. comment out 
      // to revert back. 
      strCss = "-fx-padding: 0;"; 


      this.setStyle(strCss); 

      textField = new TextField(); 

      // 
      // Default style pulled from caspian.css. Used to play around with the inset background colors 
      // ---trying to produce a text box without borders 
      strCss = "" + 
        //"-fx-background-color: -fx-shadow-highlight-color, -fx-text-box-border, -fx-control-inner-background;" + 
        "-fx-background-color: -fx-control-inner-background;" + 
        //"-fx-background-insets: 0, 1, 2;" + 
        "-fx-background-insets: 0;" + 
        //"-fx-background-radius: 3, 2, 2;" + 
        "-fx-background-radius: 0;" + 
        "-fx-padding: 3 5 3 5;" + /*Play with this value to center the text depending on cell height??*/ 
        //"-fx-padding: 0 0 0 0;" + 
        "-fx-prompt-text-fill: derive(-fx-control-inner-background,-30%);" + 
        "-fx-cursor: text;" + 
        ""; 
      // Focused and hover states should be set in the CSS. This is just a test 
      // to see what happens when we set the style in code 
      textField.focusedProperty().addListener(new ChangeListener<Boolean>() { 

      public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) { 
       TextField tf = (TextField)getGraphic(); 
       String strStyleGotFocus = "-fx-background-color: purple, -fx-text-box-border, -fx-control-inner-background;" + 
          "-fx-background-insets: -0.4, 1, 2;" + 
          "-fx-background-radius: 3.4, 2, 2;"; 
       String strStyleLostFocus = //"-fx-background-color: -fx-shadow-highlight-color, -fx-text-box-border, -fx-control-inner-background;" + 
            "-fx-background-color: -fx-control-inner-background;" + 
           //"-fx-background-insets: 0, 1, 2;" + 
            "-fx-background-insets: 0;" + 
           //"-fx-background-radius: 3, 2, 2;" + 
            "-fx-background-radius: 0;" + 
            "-fx-padding: 3 5 3 5;" + /**/ 
            //"-fx-padding: 0 0 0 0;" + 
            "-fx-prompt-text-fill: derive(-fx-control-inner-background,-30%);" + 
            "-fx-cursor: text;" + 
            ""; 
       if(newValue.booleanValue()) 
        tf.setStyle(strStyleGotFocus); 
       else 
        tf.setStyle(strStyleLostFocus);    
      } 
      }); 
      textField.hoverProperty().addListener(new ChangeListener<Boolean>() { 

      public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) { 
       TextField tf = (TextField)getGraphic(); 
       String strStyleGotHover = "-fx-background-color: derive(purple,90%), -fx-text-box-border, derive(-fx-control-inner-background, 10%);" + 
          "-fx-background-insets: 1, 2.8, 3.8;" + 
          "-fx-background-radius: 3.4, 2, 2;"; 
       String strStyleLostHover = //"-fx-background-color: -fx-shadow-highlight-color, -fx-text-box-border, -fx-control-inner-background;" + 
            "-fx-background-color: -fx-control-inner-background;" + 
           //"-fx-background-insets: 0, 1, 2;" + 
            "-fx-background-insets: 0;" + 
           //"-fx-background-radius: 3, 2, 2;" + 
            "-fx-background-radius: 0;" + 
            "-fx-padding: 3 5 3 5;" + /**/ 
            //"-fx-padding: 0 0 0 0;" + 
            "-fx-prompt-text-fill: derive(-fx-control-inner-background,-30%);" + 
            "-fx-cursor: text;" + 
            ""; 
       String strStyleHasFocus = "-fx-background-color: purple, -fx-text-box-border, -fx-control-inner-background;" + 
          "-fx-background-insets: -0.4, 1, 2;" + 
          "-fx-background-radius: 3.4, 2, 2;"; 
       if(newValue.booleanValue()) { 
        tf.setStyle(strStyleGotHover); 
       } 
       else { 
        if(!tf.focusedProperty().get()) { 
        tf.setStyle(strStyleLostHover); 
        } 
        else { 
        tf.setStyle(strStyleHasFocus); 
        } 
       } 

      } 
      }); 
      textField.setStyle(strCss); 
      this.setGraphic(textField); 
     } 

     @Override 
     protected void updateItem(String item, boolean empty) { 
      super.updateItem(item, empty);   
      if(!empty) { 
      // Show the Text Field 
      this.setContentDisplay(ContentDisplay.GRAPHIC_ONLY); 

      // Retrieve the actual String Property that should be bound to the TextField 
      // If the TextField is currently bound to a different StringProperty 
      // Unbind the old property and rebind to the new one 
      ObservableValue<String> ov = getTableColumn().getCellObservableValue(getIndex()); 
      SimpleStringProperty sp = (SimpleStringProperty)ov; 

      if(this.boundToCurrently==null) { 
       this.boundToCurrently = sp; 
       this.textField.textProperty().bindBidirectional(sp); 
      } 
      else { 
       if(this.boundToCurrently != sp) { 
        this.textField.textProperty().unbindBidirectional(this.boundToCurrently); 
        this.boundToCurrently = sp; 
        this.textField.textProperty().bindBidirectional(this.boundToCurrently); 
       } 
      } 
      System.out.println("item=" + item + " ObservableValue<String>=" + ov.getValue()); 
      //this.textField.setText(item); // No longer need this!!! 
      } 
      else { 
      this.setContentDisplay(ContentDisplay.TEXT_ONLY); 
      } 
     } 

    } 
    } 
    public static void printNodeKidsRecursively(Node n, String tabs) {  
    String toTab = tabs == null ? "" : tabs; 
    String msg1 = toTab + n.getClass().getName(); 
    String msg2 = ":" + n.toString(); 

    // Spit out and text data from Text classes 
    if(javafx.scene.text.Text.class.isAssignableFrom(n.getClass())) { 
     javafx.scene.text.Text t = (javafx.scene.text.Text)n; 
     msg2 += " \"" +t.getText() + "\""; 
    } 

    // if this Node does not extend from Parent, then it can't have kids. 
    if(!Parent.class.isAssignableFrom(n.getClass())) { 
     System.out.println(msg1+msg2); 
     return; 
    } 

    Parent p = (Parent)n; 
    System.out.println(toTab + n.getClass().getName() + 
      "(KIDS=" + 
      Integer.toString(p.getChildrenUnmodifiable().size()) + ")" + 
      msg2); 

    ObservableList<Node> kids = p.getChildrenUnmodifiable(); 
    toTab +=" "; 
    for(Node n2 : kids) { 
     printNodeKidsRecursively(n2, toTab); 
    } 
    } 

    private final TableView<TableData> table = new TableView<TableData>(); 
    final ObservableList<TableData> ol = 
     FXCollections.observableArrayList(
     new TableData("Wilma","Flintstone","555-123-4567","WFlintstone@gmail.com"), 
     new TableData("Fred","Flintstone","555-123-4567","FFlintstone@gmail.com"), 
     new TableData("Barney","Flintstone","555-123-4567","Barney@gmail.com"), 
     new TableData("Bugs","Bunny","555-123-4567","BugsB@gmail.com"), 
     new TableData("Yo","Sam","555-123-4567","ysam@gmail.com"), 
     new TableData("Tom","","555-123-4567","tom@gmail.com"), 
     new TableData("Jerry","","555-123-4567","Jerry@gmail.com"), 
     new TableData("Peter","Pan","555-123-4567","Ppan@gmail.com"), 
     new TableData("Daffy","Duck","555-123-4567","dduck@gmail.com"), 
     new TableData("Tazmanian","Devil","555-123-4567","tdevil@gmail.com"), 
     new TableData("Mickey","Mouse","555-123-4567","mmouse@gmail.com"), 
     new TableData("Mighty","Mouse","555-123-4567","mimouse@gmail.com") 
     ); 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
    Application.launch(args); 
    } 

    @Override 
    public void start(Stage Stage) {  
    Stage.setTitle("Editable Table"); 
    BorderPane borderPane = new BorderPane(); 
    Scene scene = new Scene(borderPane, 800, 600); 

    // top of border pane 
    Button b1 = new Button("Print Scene Graph for table Node"); 
    Button b2 = new Button("Change value in table list"); 
    HBox hbox = new HBox(10); 
    hbox.setStyle("-fx-background-color: #336699"); 
    hbox.setAlignment(Pos.BOTTOM_CENTER); 
    HBox.setMargin(b2, new Insets(10,0,10,0)); 
    HBox.setMargin(b1, new Insets(10,0,10,0)); 
    hbox.getChildren().addAll(b1,b2); 
    borderPane.setTop(hbox); 
    BorderPane.setAlignment(hbox, Pos.CENTER); 

    // Button Events 
    b1.setOnAction(new EventHandler<ActionEvent>() { 

     public void handle(ActionEvent event) { 
      printNodeKidsRecursively(table,""); 
     } 
    }); 
    b2.setOnAction(new EventHandler<ActionEvent>() { 

     @Override 
     public void handle(ActionEvent event) { 
     String curFirstName = ol.get(0).getFirstName(); 
     if(curFirstName.contentEquals("Jason")) 
      ol.get(0).setFirstName("Paul"); 
     else 
      ol.get(0).setFirstName("Jason"); 
     } 
    }); 

    table.setItems(ol); 
    borderPane.setCenter(table); 
    BorderPane.setAlignment(table, Pos.CENTER); 
    BorderPane.setMargin(table, new Insets(25)); 

    // Add columns 
    TableColumn<TableData,String> c1 = new TableColumn<TableData,String>("FirstName"); 
    c1.setCellValueFactory(new PropertyValueFactory<TableData,String>("firstName")); 
    c1.setCellFactory(new TextFieldCellFactory()); 

    TableColumn<TableData,String> c2 = new TableColumn<TableData,String>("LastName"); 
    c2.setCellValueFactory(new PropertyValueFactory<TableData,String>("lastName")); 
    c2.setCellFactory(new TextFieldCellFactory()); 

    TableColumn<TableData,String> c3 = new TableColumn<TableData,String>("Phone"); 
    c3.setCellValueFactory(new PropertyValueFactory<TableData,String>("phone")); 
    c3.setCellFactory(new TextFieldCellFactory()); 

    TableColumn<TableData,String> c4 = new TableColumn<TableData,String>("Email"); 
    c4.setCellValueFactory(new PropertyValueFactory<TableData,String>("email")); 
    c4.setCellFactory(new TextFieldCellFactory()); 

    table.getColumns().addAll(c1,c2,c3,c4); 

    Stage.setScene(scene); 
    Stage.show(); 

    } 
}