在javafx中创建嵌套的TreeItem [英] creating nested TreeItem in javafx

问题描述

当时，我在TreeTableView中的TreeItem看起来很平坦，像这样:

At the time my TreeItem in TreeTableView looks flat and like this:

    //////////////////row//////////////////////////////
    for (Entry<String, String> entryRow : dc.getSortedfuncAll().entrySet()) {
        root.getChildren().add(new TreeItem<String>(entryRow.getValue()));

    }
    // ////////////////treetable////////////////////////////
    final TreeTableView<String> treeTableView = new TreeTableView<>(root);

• AUF_1086686287581_9999
• AUF_1086686329972_10049
• AUF_1079023138936_6682
• AUF_1087981634453_7022
• AUF_1060589919844_59496
• AUF_1421268568003_1743
• AUF_1422451819445_14260
• AUF_1421268533080_1741
• AUF_1421268719761_1776
• AUF_1421272434570_1781
• AUF_1421268568003_1743
• AUF_1086686287581_9999
• AUF_1086686329972_10049
• AUF_1079023138936_6682
• AUF_1087981634453_7022
• AUF_1060589919844_59496
• AUF_1421268568003_1743
• AUF_1422451819445_14260
• AUF_1421268533080_1741
• AUF_1421268719761_1776
• AUF_1421272434570_1781
• AUF_1421268568003_1743

考虑它们之间具有以下关系: 是TreeMap<String,ArrayList<String>>的结果:

consider having the following relation between them: it is result of TreeMap<String,ArrayList<String>>:

{AUF_1060589919844_59496=[AUF_1086686287581_9999,AUF_1086686329972_10049,AUF_1079023138936_6682],
AUF_1087981634453_7022=[AUF_1421268533080_1741, AUF_1421268568003_1743],
AUF_1421268533080_1741=[AUF_1421268719761_1776], 
AUF_1421272434570_1781=[AUF_1087981634453_7022], 
AUF_1422451819445_14260=[AUF_1421268568003_1743]}

我想让他们像这样分层:

I want to have them hierarchal like this:

• AUF_1060589919844_59496
  • AUF_1079023138936_6682
  • AUF_1086686287581_9999
  • AUF_1086686329972_10049
  • AUF_1060589919844_59496
    • AUF_1079023138936_6682
    • AUF_1086686287581_9999
    • AUF_1086686329972_10049
    • AUF_1087981634453_7022
      • AUF_1421268568003_1743
      • AUF_1421268533080_1741
        • AUF_1421268719761_1776
        • AUF_1087981634453_7022
          • AUF_1421268568003_1743
          • AUF_1421268533080_1741
            • AUF_1421268719761_1776
            • AUF_1421268568003_1743

            我应该在哪里尝试应用它? (单元工厂?)，您能找到一种建立嵌套关系的方法吗?

            where should I try to apply it? (cell Factory?) and can you figure out a method to make the nested relationship?

            推荐答案

            这里是一种解决方案，假定您事先知道并提供了初始树的根作为输入.

            Here is a solution which assumes that you know and supply as input the initial tree roots before-hand.

            该解决方案通过递归遍历数据结构来确定要在树层次结构的每个级别上记录的TreeItem，以使其工作.该解决方案假定输入图数据结构中的节点不是周期性的.如果输入数据中存在周期，则解决方案将永远循环.

            The solution works by recursively traversing the data structure to determine the TreeItems to be recorded at each level of the tree hierarchy. The solution assumes that the nodes in the input graph data structure is not cyclical. If there are cycles in the input data, the solution would loop forever.

            此解决方案在显示树之前先创建所有树项目值，而不是在用户单击以扩展该级别时确定给定级别的树项目值.

            This solution creates all of the tree item values up front before the tree is displayed rather than determining the tree item values for a given level when the user clicks to expand that level.

            import javafx.application.Application;
            import javafx.scene.Scene;
            import javafx.scene.control.TreeItem;
            import javafx.scene.control.TreeView;
            import javafx.stage.Stage;
            
            import java.util.Arrays;
            import java.util.List;
            import java.util.TreeMap;
            import java.util.stream.Collectors;
            
            public class NestedTree extends Application {
                @Override
                public void start(Stage stage) {
                    // create some sample data.
                    TreeMap<String, List<String>> data = new TreeMap<>();
            
                    data.put("AUF_1060589919844_59496", Arrays.asList("AUF_1086686287581_9999", "AUF_1086686329972_10049", "AUF_1079023138936_6682"));
                    data.put("AUF_1087981634453_7022", Arrays.asList("AUF_1421268533080_1741", "AUF_1421268568003_1743"));
                    data.put("AUF_1421268533080_1741", Arrays.asList("AUF_1421268719761_1776"));
                    data.put("AUF_1421272434570_1781", Arrays.asList("AUF_1087981634453_7022"));
                    data.put("AUF_1422451819445_14260", Arrays.asList("AUF_1421268568003_1743"));
            
                    String[] rootKeys = {
                            "AUF_1060589919844_59496",
                            "AUF_1421272434570_1781",
                            "AUF_1422451819445_14260"
                    };
            
                    // create the tree from the data.
                    TreeView<String> tree = createTreeView(
                            data,
                            rootKeys
                    );
            
                    // display the tree.
                    Scene scene = new Scene(tree);
                    stage.setScene(scene);
                    stage.show();
                }
            
                /**
                 * Create a TreeView of a set of data
                 * given the data and identified roots within the data.
                 */
                private TreeView<String> createTreeView(
                        TreeMap<String, List<String>> data,
                        String[] rootKeys
                ) {
                    TreeItem<String> root = new TreeItem<>();
                    Arrays.stream(rootKeys).sorted().forEach(
                            rootKey ->
                                    root.getChildren().add(
                                            createTreeItem(data, rootKey)
                                    )
                    );
            
                    TreeView<String> tree = new TreeView<>();
                    tree.setRoot(root);
                    tree.setShowRoot(false);
            
                    return tree;
                }
            
                /**
                 * Create a TreeItem for a TreeView from a set of data
                 * given the data and an identified root within the data.
                 */
                private TreeItem<String> createTreeItem(
                        TreeMap<String, List<String>> data,
                        String rootKey
                ) {
                    TreeItem<String> item = new TreeItem<>();
                    item.setValue(rootKey);
                    item.setExpanded(true);
            
                    List<String> childData = data.get(rootKey);
                    if (childData != null) {
                        childData.stream()
                            .sorted()
                            .map(
                                    child -> createTreeItem(data, child)
                            )
                            .collect(
                                    Collectors.toCollection(item::getChildren)
                            );
                    }
            
                    return item;
                }
            
                public static void main(String[] args) {
                    Application.launch(args);
                }
            }
            

            这篇关于在javafx中创建嵌套的TreeItem的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！