我有一个TreeTableView
,其中每个节点都有一个图标。当我伸展树(Splay Tree)时,一切正常,但是当我折叠树时,不再可见的项目的图标会被留下。
行和文本被删除,但图标仍然“自由 float ”。在屏幕截图中,您可以看到 TreeTableView
两次,一次使用正确的文本展开,一次仅使用剩余的图标折叠。
上面的屏幕截图是根据以下最小示例创建的(您只需添加自己的 icon.png
):
import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableColumn.CellDataFeatures;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableView;
import javafx.stage.Stage;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
public class TreeTableViewSample extends Application {
private static final Image icon = new Image(TreeTableViewSample.class.getResourceAsStream("icon.png"));
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage stage) {
stage.setTitle("Tree Table View Samples");
final Scene scene = new Scene(new Group(), 200, 400);
Group sceneRoot = (Group)scene.getRoot();
//Creating tree items
final TreeItem<String> childNode1 = new TreeItem<>("Child Node 1", new ImageView(icon));
final TreeItem<String> childNode2 = new TreeItem<>("Child Node 2", new ImageView(icon));
final TreeItem<String> childNode3 = new TreeItem<>("Child Node 3", new ImageView(icon));
//Creating the root element
final TreeItem<String> root = new TreeItem<>("Root node", new ImageView(icon));
root.setExpanded(true);
//Adding tree items to the root
root.getChildren().setAll(childNode1, childNode2, childNode3);
//Creating a column
TreeTableColumn<String,String> column = new TreeTableColumn<>("Column");
column.setPrefWidth(150);
//Defining cell content
column.setCellValueFactory((CellDataFeatures<String, String> p) ->
new ReadOnlyStringWrapper(p.getValue().getValue()));
//Creating a tree table view
final TreeTableView<String> treeTableView = new TreeTableView<>(root);
treeTableView.getColumns().add(column);
treeTableView.setPrefWidth(152);
treeTableView.setShowRoot(true);
sceneRoot.getChildren().add(treeTableView);
stage.setScene(scene);
stage.show();
}
}
我已在 Linux 上使用 OpenJDK 和 Oracle Java 8u92 并在 Windows 上使用 Oracle Java 8u92 进行了尝试。
最佳答案
这是一个错误。它在我的旧版本 1.8.0_71 上运行良好,但如您在 1.8.0_92 中描述的那样失败。
恕我直言,在 TreeItem
中定义图形无论如何都是无意义的:TreeItem
是树模型的一部分,应该只包含数据,而不包含如何给出了数据。图形应该是单元格的属性,并且应该在单元格工厂中定义。以下解决方法按预期工作:
import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableCell;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableColumn.CellDataFeatures;
import javafx.scene.control.TreeTableView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
public class TreeTableViewSample extends Application {
private static final Image icon = new Rectangle(12, 12, Color.CORNFLOWERBLUE).snapshot(null, null);
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage stage) {
stage.setTitle("Tree Table View Samples");
final Scene scene = new Scene(new Group(), 200, 400);
Group sceneRoot = (Group)scene.getRoot();
//Creating tree items
// final TreeItem<String> childNode1 = new TreeItem<>("Child Node 1", new ImageView(icon));
// final TreeItem<String> childNode2 = new TreeItem<>("Child Node 2", new ImageView(icon));
// final TreeItem<String> childNode3 = new TreeItem<>("Child Node 3", new ImageView(icon));
final TreeItem<String> childNode1 = new TreeItem<>("Child Node 1");
final TreeItem<String> childNode2 = new TreeItem<>("Child Node 2");
final TreeItem<String> childNode3 = new TreeItem<>("Child Node 3");
//Creating the root element
// final TreeItem<String> root = new TreeItem<>("Root node", new ImageView(icon));
final TreeItem<String> root = new TreeItem<>("Root node");
root.setExpanded(true);
//Adding tree items to the root
root.getChildren().setAll(childNode1, childNode2, childNode3);
//Creating a column
TreeTableColumn<String,String> column = new TreeTableColumn<>("Column");
column.setPrefWidth(150);
//Defining cell content
column.setCellValueFactory((CellDataFeatures<String, String> p) ->
new ReadOnlyStringWrapper(p.getValue().getValue()));
// cell factory to display graphic:
column.setCellFactory(ttc -> new TreeTableCell<String, String>() {
private final ImageView graphic = new ImageView(icon);
@Override
protected void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
setText(empty ? null : item);
setGraphic(empty ? null : graphic);
}
});
//Creating a tree table view
final TreeTableView<String> treeTableView = new TreeTableView<>(root);
treeTableView.getColumns().add(column);
treeTableView.setPrefWidth(152);
treeTableView.setShowRoot(true);
sceneRoot.getChildren().add(treeTableView);
stage.setScene(scene);
stage.show();
}
}
关于JavaFX TreeTableView 折叠时留下图标,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36917220/