JavaFX TableView列宽度\内容自动截断

Question

我正在尝试"巧妙地"缩写/截断String嵌套在TableView中的列的内容.我尝试过使用UNCONSTRAINED_RESIZE_POLICY但非常喜欢,CONSTRAINED_RESIZE_POLICY因为它会根据窗口大小自动调整列的大小.

我想要完成的事情:

String one = "SomeVeryLongString";

// Displayed in the column where user has shrunk it too narrow

+-------------+
| Some...ring |
+-------------+

// and if the user shrunk it a bit more

+-----------+
| Som...ing |
+-----------+

// and if they stretch it a bit

+---------------+
| SomeV...tring |
+---------------+

// etc...

我已经探索了读取String长度并进行自己的截断的可能性,但是当用户收缩/拉伸gui时,不可能动态更新.我的直觉说这必须完成,JavaFX Classes因为它会与之密切相关TableView,但我还没找到办法.

我该如何使用JavaFX？

Answer 1

解

标准TableCell的默认溢出行为是截断它的字符串并显示...在字符串的末尾以指示该字符串已被截断.JavaFX中的所有Labeled控件都以这种方式工作.

您问题中的示例在...字符串中间有省略号.为此,请在相应单元工厂生成的单元格上设置溢出样式:

setTextOverrun(OverrunStyle.CENTER_WORD_ELLIPSIS);

为省略号显示的文本字符串也可以通过在相应的单元工厂生成的单元格上设置新的省略号字符串来修改:

setEllipsisString(ellipsisString);

一个简单的表格单元格用于演示:

class CenteredOverrunTableCell extends TableCell<Person, String> {
    public CenteredOverrunTableCell() {
        this(null);
    }

    public CenteredOverrunTableCell(String ellipsisString) {
        super();
        setTextOverrun(OverrunStyle.CENTER_WORD_ELLIPSIS);
        if (ellipsisString != null) {
            setEllipsisString(ellipsisString);
        }  
    }

    @Override protected void updateItem(String item, boolean empty) {
        super.updateItem(item, empty);
        setText(item == null ? "" : item);
    }
}

样品申请

的CenteredOverrunTableCell是在下面的示例应用程序中使用.

1. "名字"列忽略中心的文本,并使用自定义省略号字符串 <--->
2. "姓氏"列省略了中心的文本,但未提供自定义省略号字符串.
3. "电子邮件"列仅使用默认的溢出策略和省略号字符串,该字符串将...省略号放在溢出字符串的末尾.

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.*;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import javafx.util.Callback;

public class ElidedTableViewSample extends Application {
    private TableView<Person> table = new TableView<>();
    private final ObservableList<Person> data =
        FXCollections.observableArrayList(
            new Person("Jacob", "Smith", "jacob.smith@example.com"),
            new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
            new Person("Ethangorovichswavlowskikaliantayaprodoralisk", "Llanfairpwllgwyngyllgogerychwyrndrobwyll-llantysiliogogogoch", "ethan@llanfairpwllgwyngyllgogerychwyrndrobwyll-llantysiliogogogoch.com"),
            new Person("Emma", "Jones", "emma.jones@example.com"),
            new Person("Michael", "Brown", "michael.brown@example.com")
        );

    public static void main(String[] args) { launch(args); }

    @Override public void start(Stage stage) {
        stage.setTitle("Table View Sample");
        stage.setWidth(470);
        stage.setHeight(500);

        final Label label = new Label("Address Book");
        label.setFont(new Font("Arial", 20));

        TableColumn firstNameCol = new TableColumn("First Name");
        firstNameCol.setCellValueFactory(
                new PropertyValueFactory<Person, String>("firstName"));
        firstNameCol.setCellFactory(new Callback<TableColumn<Person, String>, TableCell<Person, String>>() {
            @Override public TableCell<Person, String> call(TableColumn<Person, String> p) {
                return new CenteredOverrunTableCell("<--->");
            }
        });

        TableColumn lastNameCol = new TableColumn("Last Name");
        lastNameCol.setCellValueFactory(
                new PropertyValueFactory<Person, String>("lastName"));
        lastNameCol.setCellFactory(new Callback<TableColumn<Person, String>, TableCell<Person, String>>() {
            @Override public TableCell<Person, String> call(TableColumn<Person, String> p) {
                return new CenteredOverrunTableCell();
            }
        });

        TableColumn emailCol = new TableColumn("Email");
        emailCol.setCellValueFactory(
                new PropertyValueFactory<Person, String>("email"));

        table.setItems(data);
        table.getColumns().addAll(
            firstNameCol, 
            lastNameCol, 
            emailCol
        );

        final VBox vbox = new VBox();
        vbox.setSpacing(5);
        vbox.setPadding(new Insets(10));
        vbox.getChildren().addAll(label, table);

        table.setColumnResizePolicy(
            TableView.CONSTRAINED_RESIZE_POLICY
        );

        Scene scene = new Scene(vbox);
        stage.setScene(scene);
        stage.show();
    }

    class CenteredOverrunTableCell extends TableCell<Person, String> {
        public CenteredOverrunTableCell() {
            this(null);
        }

        public CenteredOverrunTableCell(String ellipsisString) {
            super();
            setTextOverrun(OverrunStyle.CENTER_WORD_ELLIPSIS);
            if (ellipsisString != null) {
                setEllipsisString(ellipsisString);
            }  
        }

        @Override protected void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            setText(item == null ? "" : item);
        }
    }

    public static class Person {
        private final SimpleStringProperty firstName;
        private final SimpleStringProperty lastName;
        private final SimpleStringProperty email;

        private Person(String fName, String lName, String email) {
            this.firstName = new SimpleStringProperty(fName);
            this.lastName = new SimpleStringProperty(lName);
            this.email = new SimpleStringProperty(email);
        }

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

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

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

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

        public String getEmail() {
            return email.get();
        }

        public void setEmail(String fName) {
            email.set(fName);
        }
    }
}