我正在使用树视图，用户需要在其中添加树项。这是我的代码
CONCAT(name, ' (' || abbrv || ')')
Root有2个叶子import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.Label;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TextField;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.control.cell.TextFieldTreeCell;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Callback;
public class Main extends Application
{
private BorderPane border;
@SuppressWarnings("unchecked")
@Override
public void start(Stage primaryStage)
{
border = new BorderPane();
Scene scene = new Scene(border,600,300);
primaryStage.setTitle("BorderPane");
primaryStage.setScene(scene);
primaryStage.show();
TreeItem<String> tree = new TreeItem<String>("Main System");
TreeItem<String> item2 = new TreeItem<String>("Roots");
TreeItem<String> item2Child1 = new TreeItem<String>("UX");
TreeItem<String> item2Child2 = new TreeItem<String>("UY");
item2.getChildren().addAll(item2Child1,item2Child2);
item2.setExpanded(true);
tree.setExpanded(true);
tree.getChildren().add(item2);
TreeView<String> treeView = new TreeView<String>(tree);
treeView.setCellFactory(new Callback<TreeView<String>,TreeCell<String>>(){
@Override
public TreeCell<String> call(TreeView<String> p) {
return new AddMenuTreeCell();
}
});
VBox box3 = new VBox();
treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem>() {
@Override
public void changed(ObservableValue<? extends TreeItem> observable, TreeItem oldValue, TreeItem newValue) {
if (newValue.getValue().equals(item2Child1.getValue())) {
box3.getChildren().add(getrightPane1());
} else {
int i = box3.getChildren().size();
if (i > 0) {
box3.getChildren().remove(0);
}
}
}
});
VBox box4 = new VBox();
treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem>() {
@Override
public void changed(ObservableValue<? extends TreeItem> observable, TreeItem oldValue, TreeItem newValue) {
if (newValue.getValue().equals(item2Child2.getValue())) {
box4.getChildren().add(getrightPane2());
} else {
int i = box4.getChildren().size();
if (i > 0) {
box4.getChildren().remove(0);
}
}
}
});
VBox box2 = new VBox();
treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem>() {
@Override
public void changed(ObservableValue<? extends TreeItem> observable, TreeItem oldValue, TreeItem newValue) {
if (newValue.getValue().equals(item2.getValue())) {
box2.getChildren().add(getrightPane3());
} else {
int i = box2.getChildren().size();
if (i > 0) {
box2.getChildren().remove(0);
}
}
}
});
HBox hb = new HBox();
hb.getChildren().addAll(treeView,box2,box3,box4);
border.setCenter(hb);
}
private static class AddMenuTreeCell extends TextFieldTreeCell<String> {
private ContextMenu menu = new ContextMenu();
private TextField textField;
public AddMenuTreeCell() {
MenuItem newitem1 = new MenuItem("Insert leaf");
menu.getItems().add(newitem1);
newitem1.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent arg0) {
TreeItem<String> newLeaf = new TreeItem<String>("UY" );
getTreeItem().getChildren().add(newLeaf);
}
});
}
@Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
if (empty) {
setText(null);
setGraphic(null);
} else {
if (isEditing()) {
if (textField != null) {
textField.setText(getString());
}
setText(null);
setGraphic(textField);
} else {
setText(getString());
setGraphic(getTreeItem().getGraphic());
if (!(getTreeItem().isLeaf() && getTreeItem().getParent() == null)){
setContextMenu(menu);
}
}
}
}
private String getString() {
return getItem() == null ? "" : getItem().toString();
}
}
TextField textf1 = new TextField();
TextField textf2 = new TextField();
BorderPane root1 = new BorderPane();
private BorderPane getrightPane1() {
VBox vbox = new VBox(20);
vbox.setPadding(new Insets(10));
HBox h1 = new HBox(7);
HBox h2 = new HBox(7);
textf1.setPrefWidth(100);
textf1.setPromptText("Enter Height");
textf1.setOnKeyReleased(new EventHandler<KeyEvent>(){
@Override
public void handle(KeyEvent event)
{
if(textf1.getText().length() > 0 && textf2.getText().length() > 0)
{
Rectangle rect = new Rectangle();
rect.setHeight(Double.parseDouble(textf1.getText()));
rect.setWidth(Double.parseDouble(textf2.getText()));
rect.setFill(null);
rect.setStroke(Color.RED);
root1.setBottom(rect);
}
}
});
textf2.setPrefWidth(100);
textf2.setPromptText("Enter Width");
textf2.setOnKeyReleased(new EventHandler<KeyEvent>(){
@Override
public void handle(KeyEvent event)
{
if(textf1.getText().length() > 0 && textf2.getText().length() > 0)
{
Rectangle rect = new Rectangle();
rect.setHeight(Double.parseDouble(textf1.getText()));
rect.setWidth(Double.parseDouble(textf2.getText()));
rect.setFill(null);
rect.setStroke(Color.RED);
root1.setBottom(rect);
}
}
});
h1.getChildren().addAll(new Label("Y1:"), textf1);
h2.getChildren().addAll(new Label("X1:"), textf2);
vbox.getChildren().addAll(h1, h2);
root1.setLeft(vbox);
return root1;
}
TextField textf3 = new TextField();
TextField textf4 = new TextField();
BorderPane root2 = new BorderPane();
private BorderPane getrightPane2() {
VBox vbox = new VBox(20);
vbox.setPadding(new Insets(10));
HBox h1 = new HBox(7);
HBox h2 = new HBox(7);
textf3.setPrefWidth(100);
textf3.setPromptText("Enter Height");
textf3.setOnKeyReleased(new EventHandler<KeyEvent>(){
@Override
public void handle(KeyEvent event)
{
if(textf3.getText().length() > 0 && textf4.getText().length() > 0)
{
Rectangle rect = new Rectangle();
rect.setHeight(Double.parseDouble(textf3.getText()));
rect.setWidth(Double.parseDouble(textf4.getText()));
rect.setFill(null);
rect.setStroke(Color.BLUE);
root2.setBottom(rect);
}
}
});
textf4.setPrefWidth(100);
textf4.setPromptText("Enter Width");
textf4.setOnKeyReleased(new EventHandler<KeyEvent>(){
@Override
public void handle(KeyEvent event)
{
if(textf3.getText().length() > 0 && textf4.getText().length() > 0)
{
Rectangle rect = new Rectangle();
rect.setHeight(Double.parseDouble(textf3.getText()));
rect.setWidth(Double.parseDouble(textf4.getText()));
rect.setFill(null);
rect.setStroke(Color.BLUE);
root2.setBottom(rect);
}
}
});
h1.getChildren().addAll(new Label("Y2:"), textf3);
h2.getChildren().addAll(new Label("X2:"), textf4);
vbox.getChildren().addAll(h1, h2);
root2.setLeft(vbox);
return root2;
}
private HBox getrightPane3() {
HBox hbox = new HBox(20);
hbox.setAlignment(Pos.BOTTOM_CENTER);
hbox.setPadding(new Insets(50));
HBox hbox1 = new HBox();
Rectangle rect1 = new Rectangle();
if (!textf1.getText().equals("") && !textf2.getText().equals("")) {
rect1.setHeight(Double.parseDouble(textf1.getText()));
rect1.setWidth(Double.parseDouble(textf2.getText()));
rect1.setFill(null);
rect1.setStroke(Color.RED);
hbox1.getChildren().addAll(rect1);
}
HBox hbox2 = new HBox();
Rectangle rect2 = new Rectangle();
if (!textf3.getText().equals("") && !textf4.getText().equals("")) {
rect2.setHeight(Double.parseDouble(textf3.getText()));
rect2.setWidth(Double.parseDouble(textf4.getText()));
rect2.setFill(null);
rect2.setStroke(Color.BLUE);
hbox2.getChildren().addAll(rect2);
}
hbox.getChildren().addAll(hbox1,hbox2);
return hbox;
}
}
，两者都包含构建矩形的逻辑，并且矩形在根中水平显示。现在问题是用户需要添加另一个叶名Ux, Uy并且应该具有相同的Rectangle构建逻辑，并且这些新构建的矩形应该自动显示在root中。
我尝试添加另一个Uy，但这不起作用。我该怎么办？请提示。
谢谢