Question

我正在尝试在javafx中实现TreeTableView，其中第一列包含字符串值，第三列将呈现为3状态复选框。使用以下MCVE，我可以获得treetable但复选框中的所有选项都不会在父级折叠/展开或调整大小时保留。
的 MCVE
A类是父母 B级延伸A并且是孩子 C类代表第二列，（呈现为复选框）
类MVCECheckBox构建treetable并显示它。

A.java

package mcve.checkbox;

import java.util.List;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

/**
 *
 * @author returncode13
 */
public class A {
    StringProperty name=new SimpleStringProperty();
    C check=new C();
    List<A> children;

    public StringProperty getName() {
        return name;
    }

     public void setName(String name) {
        this.name.set(name);
    }

    public C getCheck() {
        return check;
    }

    public void setCheck(C check) {
        this.check = check;
    }

    public StringProperty nameProperty(){
        return name;
    }

    public List<A> getChildren() {
        return children;
    }

    public void setChildren(List<A> children) {
        this.children = children;
    }


    }

B.java

package mcve.checkbox;

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

/**
 *
 * @author returncode13
 */
public class B extends A{
    StringProperty name=new SimpleStringProperty();
    C Check=new C();

    @Override
    public StringProperty getName() {
        return name;
    }

    @Override
    public void setName(String name) {
        this.name.set(name);
    }

    @Override
    public C getCheck() {
        return Check;
    }

    @Override
    public void setCheck(C Check) {
        this.Check = Check;
    }

    @Override
     public StringProperty nameProperty(){
        return name;
    }

}

C.java

package mcve.checkbox;

import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;

/**
 *
 * @author returncode13
 */
public class C {
    BooleanProperty checkUncheck=new SimpleBooleanProperty();
    BooleanProperty indeterminate=new SimpleBooleanProperty();

    public BooleanProperty getCheckUncheck() {
        return checkUncheck;
    }

    public void setCheckUncheck(BooleanProperty checkUncheck) {
        this.checkUncheck = checkUncheck;
    }

    public BooleanProperty getIndeterminate() {
        return indeterminate;
    }

    public void setIndeterminate(BooleanProperty indeterminate) {
        this.indeterminate = indeterminate;
    }

    public BooleanProperty checkUncheckProperty(){
        return checkUncheck;
    }

    public BooleanProperty indeterminateProperty(){
        return indeterminate;
    }
}

MCVECheckBox.java

package mcve.checkbox;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableCell;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableView;
import javafx.scene.control.cell.TreeItemPropertyValueFactory;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Callback;

/**
 *
 * @author returncode13
 */
public class MCVECheckBox extends Application {
    A selectedItem;
    private TreeTableView<A> treetable=new TreeTableView<>();
    @Override
    public void start(Stage primaryStage) {
       //setting up parents (A) and children (B)
        A a1=new A();                       
        a1.setName("A1");

        List<A> A1Children=new ArrayList();
        B b11=new B();
        b11.setName("B11");
        B b12=new B();
        b12.setName("B12");
        A1Children.add(b11);
        A1Children.add(b12);
        a1.setChildren(A1Children);


        A a2=new A();
        a2.setName("A2");

        List<A> A2Children=new ArrayList();
        B b21=new B();
        b21.setName("B21");
        B b22=new B();
        b22.setName("B22");
        A2Children.add(b21);
        A2Children.add(b22);
        a2.setChildren(A2Children);



        //tree columns . first one holds strings
        TreeTableColumn<A,String> name=new TreeTableColumn<>("Name");
        name.setCellValueFactory(new TreeItemPropertyValueFactory<>("name"));


        //2nd tree columns. rendered as checkboxes. boolean values
        TreeTableColumn<A,Boolean> checks=new TreeTableColumn<>("Checks");
        checks.setCellValueFactory(new Callback<TreeTableColumn.CellDataFeatures<A, Boolean>, ObservableValue<Boolean>>() {
            @Override
            public ObservableValue<Boolean> call(TreeTableColumn.CellDataFeatures<A, Boolean> param) {
                A a=param.getValue().getValue();
                SimpleBooleanProperty checkUncheck=new SimpleBooleanProperty();
                SimpleBooleanProperty indeterminate=new SimpleBooleanProperty();

                checkUncheck=(SimpleBooleanProperty) a.getCheck().getCheckUncheck();
                indeterminate=(SimpleBooleanProperty) a.getCheck().getIndeterminate();

                //to do: set parents status based on children status.


                if(indeterminate.get()){
                    return indeterminate;
                }else{
                    return checkUncheck;
                }

            }
        });


        checks.setCellFactory(new Callback<TreeTableColumn<A, Boolean>, TreeTableCell<A, Boolean>>() {
            @Override
            public TreeTableCell<A, Boolean> call(TreeTableColumn<A, Boolean> param) {
                return new CheckBoxCell();
            }
        });


        //building the tree;
        TreeItem<A> a1item=new TreeItem<>(a1);
        TreeItem<A> b11item=new TreeItem<>(b11);
        TreeItem<A> b12item=new TreeItem<>(b12);
        a1item.getChildren().add(b11item);
        a1item.getChildren().add(b12item);

        TreeItem<A> a2item=new TreeItem<>(a2);
        TreeItem<A> b21item=new TreeItem<>(b21);
        TreeItem<A> b22item=new TreeItem<>(b22);
        a2item.getChildren().add(b21item);
        a2item.getChildren().add(b22item);




        TreeItem<A> root=new TreeItem<>();
        root.getChildren().add(a1item);
        root.getChildren().add(a2item);

        treetable.getColumns().addAll(name,checks);

        treetable.setRoot(root);
        treetable.setShowRoot(false);
        treetable.setEditable(true);


      //  StackPane rootSp = new StackPane();
        Scene scene = new Scene(treetable, 300, 250);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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


    //to render checkboxes in treetable


    private  class CheckBoxCell extends TreeTableCell<A, Boolean> {


        CheckBox checkbox;

        public CheckBoxCell() {
            checkbox=new CheckBox();
            checkbox.setAllowIndeterminate(true);

            checkbox.selectedProperty().addListener((obs,wasSelected,isNowSelected) -> {
            if(isNowSelected){
               selectedItem=getTreeTableRow().getItem();
            }
            });

        }


        @Override
        public void updateItem(Boolean b,boolean empty){
            super.updateItem(b, empty);

            if(empty){
                setGraphic(null);
            }else{
                checkbox.setSelected(b);
                setGraphic(checkbox);
            }
        }
    }

}

我之前尝试使用CheckTreeTableCell在第二列上设置单元格工厂，但很快发现CheckTreeTableCell不支持3状态（检查，取消选中，不确定）复选框。之后我尝试实现上面的代码。虽然我能够引入三态复选框，但我无法让它们的状态持续存在。每次折叠/展开父级时，对其子级的检查都将被取消选中感谢您在确定修复方面提供的任何帮助。

Javafx：如何在TreeTableView

0 个答案: