如何實現treetableview的過濾

Question

任何人都可以請建議我如何實現TreeTableView組件的過濾？ 我使用JDK 1.8.20

Answer 1

下面的例子演示有三列和過濾器框TreeTableView。 過濾是通過創建TreeItems的新層次來實現的。 如果任何子項匹配其所有父項，也會顯示（以保留樹結構）。

import java.util.HashMap; 
import java.util.Map; 

import javafx.animation.KeyFrame; 
import javafx.application.Application; 
import javafx.beans.InvalidationListener; 
import javafx.beans.Observable; 
import javafx.beans.binding.ListBinding; 
import javafx.beans.property.BooleanProperty; 
import javafx.beans.property.ReadOnlyStringWrapper; 
import javafx.beans.property.SimpleBooleanProperty; 
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.ListChangeListener; 
import javafx.collections.ObservableList; 
import javafx.event.ActionEvent; 
import javafx.event.EventHandler; 
import javafx.geometry.Insets; 
import javafx.geometry.Pos; 
import javafx.scene.Scene; 
import javafx.scene.control.Button; 
import javafx.scene.control.ButtonBuilder; 
import javafx.scene.control.CheckBox; 
import javafx.scene.control.CheckBoxBuilder; 
import javafx.scene.control.SelectionMode; 
import javafx.scene.control.TableCell; 
import javafx.scene.control.TableColumn; 
import javafx.scene.control.TableView; 
import javafx.scene.control.TextField; 
import javafx.scene.control.TreeItem; 
import javafx.scene.control.TreeTableColumn; 
import javafx.scene.control.TreeTableView; 
import javafx.scene.control.cell.PropertyValueFactory; 
import javafx.scene.layout.HBox; 
import javafx.scene.layout.StackPane; 
import javafx.scene.layout.VBox; 
import javafx.scene.layout.VBoxBuilder; 
import javafx.stage.Stage; 
import javafx.util.Callback; 
import javafx.util.Duration; 

@SuppressWarnings("all") 
public class TreeTableViewFilterDemo extends Application { 

    private TreeItem<Map<String, Object>> root; 
    private TreeTableView<Map<String, Object>> tree; 


    @Override 
    public void start(Stage primaryStage) throws Exception { 
     VBox outer = new VBox(); 

     TextField filter = new TextField(); 
     filter.textProperty().addListener((observable, oldValue, newValue) -> filterChanged(newValue)); 

     root = new TreeItem<>(); 
     tree = new TreeTableView<>(root); 
     addColumn("Region", "region"); 
     addColumn("Type", "type"); 
     addColumn("Pop.", "population"); 
     setup(); 
     tree.setShowRoot(false); 

     outer.getChildren().addAll(filter, tree); 
     Scene scene = new Scene(outer, 640, 480); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

    private void filterChanged(String filter) { 
     if (filter.isEmpty()) { 
      tree.setRoot(root);   
     } 
     else { 
      TreeItem<Map<String, Object>> filteredRoot = new TreeItem<>(); 
      filter(root, filter, filteredRoot); 
      tree.setRoot(filteredRoot); 
     } 
    } 


    private void filter(TreeItem<Map<String, Object>> root, String filter, TreeItem<Map<String, Object>> filteredRoot) { 
     for (TreeItem<Map<String, Object>> child : root.getChildren()) {    
      TreeItem<Map<String, Object>> filteredChild = new TreeItem<>(); 
      filteredChild.setValue(child.getValue()); 
      filteredChild.setExpanded(true); 
      filter(child, filter, filteredChild); 
      if (!filteredChild.getChildren().isEmpty() || isMatch(filteredChild.getValue(), filter)) { 
       System.out.println(filteredChild.getValue() + " matches."); 
       filteredRoot.getChildren().add(filteredChild); 
      } 
     } 
    } 

    private boolean isMatch(Map<String, Object> value, String filter) { 
     return value.values().stream().anyMatch((Object o) -> o.toString().contains(filter)); 
    } 

    private void setup() { 
     TreeItem<Map<String, Object>> europe = createItem(root, "Europe", "continent", 742500000L); 
     createItem(europe, "Germany", "country", 80620000L); 
     TreeItem<Map<String, Object>> austria = createItem(europe, "Austria", "country", 847400L); 
     createItem(austria, "Tyrol", "state", 728537L);  
     TreeItem<Map<String, Object>> america = createItem(root, "America", "continent", 953700000L); 
     createItem(america, "USA", "country", 318900000L); 
     createItem(america, "Mexico", "country", 122300000L);  
    } 

    private TreeItem<Map<String, Object>> createItem(TreeItem<Map<String, Object>> parent, String region, String type, long population) { 
     TreeItem<Map<String, Object>> item = new TreeItem<>(); 
     Map<String, Object> value = new HashMap<>(); 
     value.put("region", region); 
     value.put("type", type); 
     value.put("population", population); 
     item.setValue(value); 
     parent.getChildren().add(item); 
     item.setExpanded(true); 
     return item; 
    } 

    protected void addColumn(String label, String dataIndex) { 
     TreeTableColumn<Map<String, Object>, String> column = new TreeTableColumn<>(label); 
     column.setPrefWidth(150); 
     column.setCellValueFactory(
      (TreeTableColumn.CellDataFeatures<Map<String, Object>, String> param) -> { 
       ObservableValue<String> result = new ReadOnlyStringWrapper(""); 
       if (param.getValue().getValue() != null) { 
        result = new ReadOnlyStringWrapper("" + param.getValue().getValue().get(dataIndex)); 
       } 
       return result; 
      } 
     );  
     tree.getColumns().add(column); 
    } 


    public static void main(String[] args) { 
     launch(args); 
    } 

} 

Answer 2

使用FilteredList，例如：

ObservableList<Person> data = FxCollections.observableArrayList(); 
FilteredList<Person> filtered = data.filtered(p->p.getAge()>21) 
treetableview.setItems(filtered)