如何正确地向TableView添加新数据并滚动到它 [英] How to correctly add new data to TableView and scroll to it
问题描述
问题
我想动态地向TableView添加数据并滚动到新数据的位置。但是当TableView中的行达到ViewPort大小时，我会在控制台中得到它：
2015年4月18日9:14:34 AM com.sun.javafx.scene.control.skin.VirtualFlow
addTrailingCells INFO：index超过maxCellCount。检查类javafx.scene.control.TableRow的大小
计算
所以我猜我做错了。我所做的就是使用Oracle TableView示例并添加：
//按钮添加新数据
Button bt = new Button（添加）;
bt.setOnAction（e - > {
//插入新项目
int i = data.size（）+ 1;
人员=新人（姓名+ i，姓名+ i，邮件+ i）;
data.add（人）;
//滚动到新项目
table .scrollTo（person）;
}）;
当你使用
<$ p时会发生同样的情况$ p>
table.getItems（）。add（person）;
而非修改清单。
罪魁祸首是scrollTo方法。使用scrollTo方法使用行索引时会出现相同的信息/错误。
问题
如何正确地向TableView添加新项目，以便不显示信息/错误？
代码
这是一个完整的例子。该表已预先填写。如果按下添加按钮，则会达到视口大小，并且控制台中会显示信息（或错误？）。
public class TableViewSample扩展Application {
private TableView< Person> table = new TableView< Person>（）;
私人最终ObservableList< Person> data = FXCollections.observableArrayList（）;
public static void main（String [] args）{
launch（args）;
}
@Override
public void start（舞台舞台）{
场景场景=新场景（新组（））;
stage.setTitle（Table View Sample）;
stage.setWidth（450）;
stage.setHeight（500）;
table.setEditable（true）;
TableColumn firstNameCol = new TableColumn（First Name）;
firstNameCol.setMinWidth（100）;
firstNameCol.setCellValueFactory（
new PropertyValueFactory< Person，String>（firstName））;
TableColumn lastNameCol = new TableColumn（Last Name）;
lastNameCol.setMinWidth（100）;
lastNameCol.setCellValueFactory（
new PropertyValueFactory< Person，String>（lastName））;
TableColumn emailCol = new TableColumn（Email）;
emailCol.setMinWidth（200）;
emailCol.setCellValueFactory（
new PropertyValueFactory< Person，String>（email））;
table.setItems（data）;
table.getColumns（）。addAll（firstNameCol，lastNameCol，emailCol）;
// -------------------------------
//动态添加数据
// -------------------------------
//填表数据
for（int i = 0; i< 14; i ++）{
Person person = new Person（Name+ i，Name+ i，Mail+ i）;
data.add（person）;
}
//按钮添加新数据
按钮bt = new按钮（添加）;
bt.setOnAction（e - > {
//插入新项目
int i = data.size（）+ 1;
人员=新人（姓名+ i，姓名+ i，邮件+ i）;
data.add（人）;
//滚动到新项目
table .scrollTo（person）;
}）;
// -------------------------------
final VBox vbox = new VBox（）;
vbox.setSpacing（5）;
vbox.getChildren（）。addAll（table，bt）;
（（Group）scene.getRoot（））。getChildren（）。addAll（vbox）;
stage.setScene（场景）;
stage.show（）;
}
public static class Person {
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
私人最终的SimpleStringProperty电子邮件;
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）;
}
}
}
通过重置日志管理器来抑制警告：
import javafx.application。*;
import javafx.stage。*;
import javafx.scene。*;
import javafx.scene.control。*;
import javafx.scene.control.cell。*;
import javafx.scene.layout。*;
import javafx.beans.property。*;
import javafx.collections。*;
import java.util.logging.LogManager;
公共类TableViewSample扩展Application {
// ... setup ...
public static void main（String [] args）{
//单击添加按钮时，禁止显示警告消息。
LogManager.getLogManager（）。reset（）;
launch（args）;
}
这将影响整个应用程序的记录器。如果不需要，请将违规类（ com.sun.javafx.scene.control.skin.VirtualFlow ）的日志记录级别更改为级别.OFF 。
参见：
- http://bugs.java.com/bugdatabase/view_bug.do?bug_id= 8140504
- http： //bugs.java.com/bugdatabase/view_bug.do?bug_id=8089472
因为这是一条警告信息，它可能被忽略，因此被压制。据我所知，新行已成功添加。以下是签入的违规代码，IMO违反了最不惊讶的原则：
Problem
I want to add data dynamically to a TableView and scroll to the new data's position. But when the rows in the TableView reach the ViewPort size, I get this in the console:
Apr 18, 2015 9:14:34 AM com.sun.javafx.scene.control.skin.VirtualFlow addTrailingCells INFO: index exceeds maxCellCount. Check size calculations for class javafx.scene.control.TableRow
So I guess I did something wrong. All I did was using the Oracle TableView example and add this:
// button to add new data
Button bt = new Button( "Add");
bt.setOnAction(e -> {
// insert new item
int i = data.size() + 1;
Person person = new Person( "Name " + i, "Name " + i, "Mail " + i);
data.add( person);
// scroll to new item
table.scrollTo( person);
});
The same happens when you use
table.getItems().add( person);
instead of modifying the list.
The culprit is the scrollTo method. The same info/error occurs when you use the row index with the scrollTo method.
Question
How do you add new items correctly to a TableView, so that the info/error doesn't show up?
Code
Here's a full example. The table is pre-filled. If you hit the Add button the viewport size is reached and the info (or error?) is displayed in the console.
public class TableViewSample extends Application {
private TableView<Person> table = new TableView<Person>();
private final ObservableList<Person> data = FXCollections.observableArrayList();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(500);
table.setEditable(true);
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("firstName"));
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("lastName"));
TableColumn emailCol = new TableColumn("Email");
emailCol.setMinWidth(200);
emailCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("email"));
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
// -------------------------------
// dynamically add data
// -------------------------------
// fill table with data
for( int i=0; i < 14; i++) {
Person person = new Person( "Name " + i, "Name " + i, "Mail " + i);
data.add( person);
}
// button to add new data
Button bt = new Button( "Add");
bt.setOnAction(e -> {
// insert new item
int i = data.size() + 1;
Person person = new Person( "Name " + i, "Name " + i, "Mail " + i);
data.add( person);
// scroll to new item
table.scrollTo( person);
});
// -------------------------------
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.getChildren().addAll(table, bt);
((Group) scene.getRoot()).getChildren().addAll(vbox);
stage.setScene(scene);
stage.show();
}
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);
}
}
}
Suppress the warning by resetting the log manager:
import javafx.application.*;
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.control.cell.*;
import javafx.scene.layout.*;
import javafx.beans.property.*;
import javafx.collections.*;
import java.util.logging.LogManager;
public class TableViewSample extends Application {
// ... setup ...
public static void main(String[] args) {
// Suppress the warning message when the Add button is clicked.
LogManager.getLogManager().reset();
launch(args);
}
This will affect the entire application's logger. If that is not desired, change the logging level for the offending class (com.sun.javafx.scene.control.skin.VirtualFlow) to Level.OFF.
See also:
- http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8140504
- http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8089472
Since this is a warning message, it can probably be ignored, and therefore suppressed. As far as I can tell, the new row is added successfully. Here is the offending code that was checked in, which, IMO, violates the principle of least astonishment:
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