我的问题是如何使用我自己的Comparator创建treetableview（JavaFX8）。
我找到了一些例子JavaFX TableView Sort Policy，但它们都是TableView而不是TreeTableView。
感谢。
这是我的示例代码：
import java.util.Comparator;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.property.ReadOnlyObjectWrapper;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableView;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import javafx.util.Callback;
public class TableViewSampleWithoutEdit extends Application {
private TreeTableView<Person> table = new TreeTableView<Person>();
private ExtraPerson extraPerson = new ExtraPerson("Ninja Village");
TreeItem root = new TreeItem<>("root");
private final ObservableList<TreeItem<Person>> data = FXCollections
.observableArrayList(
new TreeItem<Person>( new Person("Jacob", "Smith", "jacob.smith@example.com")),
new TreeItem<Person>( new Person("Isabella", "Johnson","isabella.johnson@example.com")),
new TreeItem<Person>( new Person("Ethan", "Williams","ethan.williams@example.com")),
new TreeItem<Person>( new Person("Emma", "Jones", "emma.jones@example.com")),
new TreeItem<Person>( new Person("Michael", "Brown", "michael.brown@example.com")),
new TreeItem<Person>( extraPerson));
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(500);
final Label label = new Label("Address Book");
label.setFont(new Font("Arial", 20));
table.setEditable(true);
Platform.runLater(() -> {
TreeTableColumn<Person, String> firstNameCol = new TreeTableColumn("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(cellData -> {
if (cellData.getValue().getValue()instanceof Person) {
return new ReadOnlyObjectWrapper(cellData.getValue().getValue().getFirstName());
}
return new ReadOnlyObjectWrapper(cellData.getValue().getValue());
});
TreeTableColumn<Person, String> lastNameCol = new TreeTableColumn("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(cellData -> {
if (cellData.getValue().getValue()instanceof Person) {
return new ReadOnlyObjectWrapper(cellData.getValue().getValue().getLastName());
}
return new ReadOnlyObjectWrapper(cellData.getValue().getValue());
});
/**
* Adding comparator to extraPerson
*/
table.sortPolicyProperty().set(
new Callback<TreeTableView<Person>, Boolean>() {
@Override
public Boolean call(final TreeTableView<Person> param) {
Comparator<TreeItem<Person>> comparator = new Comparator<TreeItem<Person>>() {
@Override
public int compare(TreeItem<Person> r1, TreeItem<Person> r2) {
if (r1.getValue() == extraPerson) {
return 1;
} else if (r2.getValue() == extraPerson) {
return -1;
} else if (param.getComparator() == null) {
return 0;
} else {System.out.println("c");
return param.getComparator()
.compare(r1, r2);
}
}
};
ObservableList<TreeItem<Person>> tables = FXCollections.observableArrayList();
for (int i = 0; i < table.getExpandedItemCount(); i++) {
tables.add(table.getTreeItem(0));
}
FXCollections.sort(tables,comparator);
if (tables.size()>0) {
table.getRoot().getChildren().setAll(tables);
}
return true;
}
});
root.getChildren().setAll(data);
table.setRoot(root);
table.getColumns().addAll(firstNameCol, lastNameCol);
root.setExpanded(true);
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.setPadding(new Insets(10, 0, 0, 10));
vbox.getChildren().addAll(label, table);
((Group) scene.getRoot()).getChildren().addAll(vbox);
stage.setScene(scene);
stage.show();
}
public static class Person {
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
private final SimpleStringProperty email;
private Person(String fName, String lName, String email) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.email = new SimpleStringProperty(email);
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String fName) {
firstName.set(fName);
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String fName) {
lastName.set(fName);
}
public String getEmail() {
return email.get();
}
public void setEmail(String fName) {
email.set(fName);
}
}
public static class ExtraPerson extends Person {
private final SimpleStringProperty address;
private ExtraPerson(String address) {
super("Itachi", "Uchiha", "leaf@village.ninja");
this.address = new SimpleStringProperty(address);
}
public String getAddress() {
return address.get();
}
public void setAddress(String address) {
this.address.set(address);
}
}
}
答案 0 :(得分：1)
只需替换它......
ObservableList<TreeItem<Person>> tables = FXCollections.observableArrayList();
for (int i = 0; i < table.getExpandedItemCount(); i++) {
tables.add(table.getTreeItem(0));
}
FXCollections.sort(tables,comparator);
if (tables.size()>0) {
table.getRoot().getChildren().setAll(tables);
}
......有了......
if(table.getRoot() != null)
FXCollections.sort(table.getRoot().getChildren(), comparator);
...它会起作用（至少对你问题中的TreeTableView而言）。
与你提到的答案完全相同：
您创建了Comparator，用于TreeTableView中的对象集合。您在不同列表上使用此比较器的唯一区别是：在链接的答案中，它用于比较table.getItems()，我将其修改为在table.getRoot().getChildren()（根节点的子节点）上使用。
请注意，如果添加多个level1 TreeItem，或者增加树级别，则必须对其进行调整，但工作流程是相同的。