如何在 JavaFX 2 TreeView
中过滤节点?
我有一个 TextField
,我想根据 TextField
的内容过滤所有节点(例如节点标签)。
谢谢。
最佳答案
这是我编写的可重用的可过滤树项目类。
过滤器应该绑定(bind)在predicateProperty上,并且您必须使用getSourceChildren方法来操作树项。
public class FilterableTreeItem<T> extends TreeItem<T> {
private final ObservableList<TreeItem<T>> sourceChildren = FXCollections.observableArrayList();
private final FilteredList<TreeItem<T>> filteredChildren = new FilteredList<>(sourceChildren);
private final ObjectProperty<Predicate<T>> predicate = new SimpleObjectProperty<>();
public FilterableTreeItem(T value) {
super(value);
filteredChildren.predicateProperty().bind(Bindings.createObjectBinding(() -> {
Predicate<TreeItem<T>> p = child -> {
if (child instanceof FilterableTreeItem) {
((FilterableTreeItem<T>) child).predicateProperty().set(predicate.get());
}
if (predicate.get() == null || !child.getChildren().isEmpty()) {
return true;
}
return predicate.get().test(child.getValue());
};
return p;
} , predicate));
filteredChildren.addListener((ListChangeListener<TreeItem<T>>) c -> {
while (c.next()) {
getChildren().removeAll(c.getRemoved());
getChildren().addAll(c.getAddedSubList());
}
});
}
public ObservableList<TreeItem<T>> getSourceChildren() {
return sourceChildren;
}
public ObjectProperty<Predicate<T>> predicateProperty() {
return predicate;
}
}
关于treeview - Javafx 2 TreeView 过滤,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15897936/