防止TableColumn仅由用户调整大小

一个快速的解决方案是为鼠标拖动表标题行添加事件过滤器。创建自定义tableView并在标题行上添加事件过滤器,如下所示:

class CustomTableView<S> extends TableView<S>{
        private Node headerRow;

        @Override
        protected void layoutChildren() {
            super.layoutChildren();
            if(headerRow ==null){
                headerRow = (Region) lookup("TableHeaderRow");
                headerRow.addEventFilter(MouseEvent.MOUSE_DRAGGED, MouseEvent::consume);
            }
        }
    }

下面是一个快速工作的演示,在仍然允许调整大小策略的情况下禁用列大小和重新排列。

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Region;
import javafx.stage.Stage;

public class TableResizeRestrictionDemo extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        ObservableList<Person> persons = FXCollections.observableArrayList();
        persons.add(new Person("Harry","John","LS"));
        persons.add(new Person("Mary","King","MS"));
        persons.add(new Person("Don","Bon","CAT"));
        persons.add(new Person("Pink","Wink","IND"));

        CustomTableView<Person> tableView = new CustomTableView<>();
        TableColumn<Person, String> fnCol = new TableColumn<>("First Name");
        fnCol.setCellValueFactory(param -> param.getValue().firstNameProperty());

        TableColumn<Person, String> lnCol = new TableColumn<>("Last Name");
        lnCol.setCellValueFactory(param -> param.getValue().lastNameProperty());

        TableColumn<Person, String> cityCol = new TableColumn<>("City");
        cityCol.setCellValueFactory(param -> param.getValue().cityProperty());

        tableView.getColumns().addAll(fnCol, lnCol, cityCol);
        tableView.setItems(persons);
        tableView.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

        Scene sc = new Scene(tableView);
        primaryStage.setScene(sc);
        primaryStage.show();

    }

    class Person{
        private StringProperty firstName = new SimpleStringProperty();
        private StringProperty lastName = new SimpleStringProperty();
        private StringProperty city = new SimpleStringProperty();

        public Person(String fn, String ln, String cty){
            setFirstName(fn);
            setLastName(ln);
            setCity(cty);
        }

        public String getFirstName() {
            return firstName.get();
        }

        public StringProperty firstNameProperty() {
            return firstName;
        }

        public void setFirstName(String firstName) {
            this.firstName.set(firstName);
        }

        public String getLastName() {
            return lastName.get();
        }

        public StringProperty lastNameProperty() {
            return lastName;
        }

        public void setLastName(String lastName) {
            this.lastName.set(lastName);
        }

        public String getCity() {
            return city.get();
        }

        public StringProperty cityProperty() {
            return city;
        }

        public void setCity(String city) {
            this.city.set(city);
        }
    }

    class CustomTableView<S> extends TableView<S>{
        private Node headerRow;

        @Override
        protected void layoutChildren() {
            super.layoutChildren();
            if(headerRow ==null){
                headerRow = (Region) lookup("TableHeaderRow");
                headerRow.addEventFilter(MouseEvent.MOUSE_DRAGGED, MouseEvent::consume);
            }
        }
    }
}

更新:: 在检查NestedTableColumnHeader类中的源代码之后,负责调整大小的节点实际上是矩形。不幸的是,没有为这个矩形设置样式类。因此,假设HeaderRow中的所有矩形都是为了调整大小,我们将查找所有矩形节点并设置事件过滤器。

内部按下-拖动-释放处理程序用于调整大小,而进入-退出处理程序用于更改光标。因此,与其为5种类型的事件设置过滤器,不如设置一个超级事件MouseEvent.ANY。这也将解决更改光标的问题。

class CustomTableView<S> extends TableView<S> {
        private final EventHandler<MouseEvent> consumeEvent = MouseEvent::consume;

        @Override
        protected void layoutChildren() {
            super.layoutChildren();
            final Set<Node> dragRects = lookup("TableHeaderRow").lookupAll("Rectangle");
            for (Node dragRect : dragRects) {
                dragRect.removeEventFilter(MouseEvent.ANY, consumeEvent);
                dragRect.addEventFilter(MouseEvent.ANY, consumeEvent);
            }
        }
    }