Java 约束性<；谓词<；MyObject>&燃气轮机；到ListView（使用SelectionMode.MULTIPLE）

我试图在可以选择多个项目的

列表视图

和

对象属性

之间进行绑定。选择项目时，我希望相应地过滤

TableView

列：

使用两个较低的过滤器（组件、详细信息），我按如下方式进行绑定：

ObjectProperty<Predicate<Log>> detailsSearchFilter = new SimpleObjectProperty<>();
TextField detailsSearchField = new TextField();
detailsSearchField.setPromptText("e.g. finished initializing");
detailsSearchFilter.bind(Bindings.createObjectBinding(() ->

                    log -> log.getDetails().toLowerCase().contains(detailsSearchField.getText().toLowerCase()),
            detailsSearchField.textProperty()
    ));

private final static String[] sources = new String[]{"ECS","IISNode","PrismWebServer"};
ListView<String> sourceList = new ListView<>();
ObservableList sourceItems = FXCollections.observableArrayList(sources);

sourceList.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
sourceList.getItems().addAll(sources);
ListView<String> selected = new ListView<>();

sourceList.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
        selected.setItems(sourceList.getSelectionModel().getSelectedItems());
        System.out.println(Arrays.toString(selected.getItems().toArray()));
    });

ObjectBinding<Predicate<Log>> binding = new ObjectBinding<Predicate<String>>() {
    private final Set<String> strings = new HashSet<>();

    {
        sourceList.getSelectionModel().getSelectedItems().addListener(new ListChangeListener<String>() {

            @Override
            public void onChanged(ListChangeListener.Change<? extends String> c) {
                boolean changed = false;

                // modify set on selection change
                while (c.next()) {
                    if (c.wasRemoved()) {
                        changed = true;
                        c.getRemoved().stream().map(String::toLowerCase).forEach(strings::remove);
                    }
                    if (c.wasAdded()) {
                        changed = true;
                        c.getAddedSubList().stream().map(String::toLowerCase).forEach(strings::add);
                    }
                }

                if (changed) {
                    invalidate();
                }
            }
        });
    }

    @Override
    protected Predicate<Log> computeValue() {
        return log -> strings.contains(log.getSource().toLowerCase());
    }

};
sourceFilter.bind(binding);

对于另外两个

ListView

过滤器，我正在考虑这样做：

ObjectProperty<Predicate<Log>> detailsSearchFilter = new SimpleObjectProperty<>();
TextField detailsSearchField = new TextField();
detailsSearchField.setPromptText("e.g. finished initializing");
detailsSearchFilter.bind(Bindings.createObjectBinding(() ->

                    log -> log.getDetails().toLowerCase().contains(detailsSearchField.getText().toLowerCase()),
            detailsSearchField.textProperty()
    ));

private final static String[] sources = new String[]{"ECS","IISNode","PrismWebServer"};
ListView<String> sourceList = new ListView<>();
ObservableList sourceItems = FXCollections.observableArrayList(sources);

sourceList.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
sourceList.getItems().addAll(sources);
ListView<String> selected = new ListView<>();

sourceList.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
        selected.setItems(sourceList.getSelectionModel().getSelectedItems());
        System.out.println(Arrays.toString(selected.getItems().toArray()));
    });

ObjectBinding<Predicate<Log>> binding = new ObjectBinding<Predicate<String>>() {
    private final Set<String> strings = new HashSet<>();

    {
        sourceList.getSelectionModel().getSelectedItems().addListener(new ListChangeListener<String>() {

            @Override
            public void onChanged(ListChangeListener.Change<? extends String> c) {
                boolean changed = false;

                // modify set on selection change
                while (c.next()) {
                    if (c.wasRemoved()) {
                        changed = true;
                        c.getRemoved().stream().map(String::toLowerCase).forEach(strings::remove);
                    }
                    if (c.wasAdded()) {
                        changed = true;
                        c.getAddedSubList().stream().map(String::toLowerCase).forEach(strings::add);
                    }
                }

                if (changed) {
                    invalidate();
                }
            }
        });
    }

    @Override
    protected Predicate<Log> computeValue() {
        return log -> strings.contains(log.getSource().toLowerCase());
    }

};
sourceFilter.bind(binding);

---

但它似乎不是很优雅，我不确定我是否正确使用了

selectionModel属性。
只有在替换
selectionModel
时才会触发更改，而这通常不会发生。依赖项应该是
sourceList.getSelectionModel（）.getSelectedItems（）

此外，根据我的理解，您应该查询
日志
的
源
是否在所选项目中，而不是
源
字符串是否在所选项目列表的某个位置包含字符串的某个部分

还请注意，应避免仅使用
列表视图
来存储数据，对于大型列表，在
集合
上执行
包含
检查要比在
列表
上进行检查有效得多

您可以使用如下代码：

ObjectProperty<Predicate<Log>> detailsSearchFilter = new SimpleObjectProperty<>();
TextField detailsSearchField = new TextField();
detailsSearchField.setPromptText("e.g. finished initializing");
detailsSearchFilter.bind(Bindings.createObjectBinding(() ->

                    log -> log.getDetails().toLowerCase().contains(detailsSearchField.getText().toLowerCase()),
            detailsSearchField.textProperty()
    ));

private final static String[] sources = new String[]{"ECS","IISNode","PrismWebServer"};
ListView<String> sourceList = new ListView<>();
ObservableList sourceItems = FXCollections.observableArrayList(sources);

sourceList.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
sourceList.getItems().addAll(sources);
ListView<String> selected = new ListView<>();

sourceList.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
        selected.setItems(sourceList.getSelectionModel().getSelectedItems());
        System.out.println(Arrays.toString(selected.getItems().toArray()));
    });

ObjectBinding<Predicate<Log>> binding = new ObjectBinding<Predicate<String>>() {
    private final Set<String> strings = new HashSet<>();

    {
        sourceList.getSelectionModel().getSelectedItems().addListener(new ListChangeListener<String>() {

            @Override
            public void onChanged(ListChangeListener.Change<? extends String> c) {
                boolean changed = false;

                // modify set on selection change
                while (c.next()) {
                    if (c.wasRemoved()) {
                        changed = true;
                        c.getRemoved().stream().map(String::toLowerCase).forEach(strings::remove);
                    }
                    if (c.wasAdded()) {
                        changed = true;
                        c.getAddedSubList().stream().map(String::toLowerCase).forEach(strings::add);
                    }
                }

                if (changed) {
                    invalidate();
                }
            }
        });
    }

    @Override
    protected Predicate<Log> computeValue() {
        return log -> strings.contains(log.getSource().toLowerCase());
    }

};
sourceFilter.bind(binding);

ObjectBinding=newobjectbinding（）{
私有最终集字符串=新HashSet（）；
{
sourceList.getSelectionModel（）.getSelectedItems（）.addListener（新ListChangeListener（））{
@凌驾
更改后的公共void（ListChangeListener.Change