我正在研究 javafx tableview 并创建了一个包含 100,000 行的表（三列一 int 两个浮点数）。
我有主动排序。要插入新行，首先使用二进制搜索搜索索引，然后使用 table.getItems.add(index,element);
但是随着每 20 毫秒添加新行，gui 有点无响应。
我添加了table.setSelectionModel(null); 它固定了我的 GUI，所以它似乎是缓慢 GUI 的罪魁祸首。
但我还需要选择行的能力.....
任何人都建议在这种情况下该怎么做....
PS :(在添加行之前table.setSelectionModel(null);我尝试运行 jprofiler 并显示javafx.scene.control.TableCell$2.onChanged消耗了主要时间)
编辑：
我的用例
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Random;
import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableColumn.SortType;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
import javafx.util.Duration;
public class TableInsertExample extends Application {
int count=0;
long s,e,mx=0,mn=1000000000;
float avg=0;
private static final Random RNG = new Random();
private Comparator<Person> tableOrderComparator ;
@SuppressWarnings("unchecked")
@Override
public void start(Stage primaryStage) {
final BorderPane root = new BorderPane();
final TableView<Person> table = new TableView<Person>();
table.setItems(createData());
final TableColumn<Person, String> firstNameColumn = new TableColumn<Person,String>("First Name");
final TableColumn<Person, String> lastNameColumn = new TableColumn<Person,String>("Last Name");
firstNameColumn.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));
lastNameColumn.setCellValueFactory(new PropertyValueFactory<Person, String>("lastName"));
table.getColumns().addAll(firstNameColumn, lastNameColumn);
tableOrderComparator = createTableOrderComparator(table);
//this line increase speed but then we can not even click on table as it will give someexception
table.setSelectionModel(null);
final GridPane addPersonPane = new GridPane();
final TextField firstNameTF = new TextField();
final TextField lastNameTF = new TextField();
final Button addButton = new Button("Add");
addPersonPane.addRow(0, new Label("First Name:"), firstNameTF);
addPersonPane.addRow(1, new Label("Last Name:"), lastNameTF);
addPersonPane.addRow(2, addButton);
final ColumnConstraints leftColConstraints = new ColumnConstraints();
leftColConstraints.setHalignment(HPos.RIGHT);
final ColumnConstraints rightColConstraints = new ColumnConstraints();
rightColConstraints.setHalignment(HPos.LEFT);
addPersonPane.getColumnConstraints().addAll(leftColConstraints, rightColConstraints);
addButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
final Person person = new Person(firstNameTF.getText(), lastNameTF.getText());
addPersonToTable(table, person);
}
});
table.getSortOrder().addAll(firstNameColumn);
Label countLabel = new Label();
countLabel.textProperty().bind(Bindings.format("Table has %s entries", Bindings.size(table.getItems())));
root.setTop(countLabel);
root.setCenter(table);
root.setBottom(addPersonPane);
primaryStage.setScene(new Scene(root, 400, 600));
primaryStage.show();
Timeline addRandomPeopleFrequently = new Timeline(new KeyFrame(Duration.millis(20), new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
Person randomPerson = new Person(randomString(), randomString());
count++;
addPersonToTable(table, randomPerson);
}
}));
addRandomPeopleFrequently.setCycleCount(Animation.INDEFINITE);
addRandomPeopleFrequently.play();
}
private Comparator<Person> createTableOrderComparator(
final TableView<Person> table) {
return new Comparator<Person>() {
@Override
public int compare(Person person1, Person person2) {
for (TableColumn<Person, ?> col : table.getSortOrder()) {
Comparator colComp = col.getComparator();
if (colComp == null) {
colComp = TableColumn.DEFAULT_COMPARATOR;
}
final Object o1 = col.getCellData(person1);
final Object o2 = col.getCellData(person2);
int c = colComp.compare(o1, o2);
if (col.getSortType() == SortType.DESCENDING) {
c = -c ;
}
if (c != 0) {
return c;
}
}
return 0 ;
}
};
}
public static void main(String[] args) {
launch(args);
}
private ObservableList<Person> createData() {
List<Person> list = new ArrayList<Person>();
for (int i=0; i<100000; i++) {
list.add(new Person(randomString(), randomString()));
}
return FXCollections.observableList(list);
}
private String randomString() {
StringBuilder sb = new StringBuilder();
for (int i=0; i<8; i++) {
sb.append((char)(RNG.nextInt(26)+'a'));
}
return sb.toString();
}
private void addPersonToTable(final TableView<Person> table,
final Person person) {
int index ;
final ObservableList<TableColumn<Person, ?>> tableSortOrder = table.getSortOrder();
if (tableSortOrder.size()==0) {
index = table.getItems().size();
} else {
index = Collections.binarySearch(table.getItems(), person, tableOrderComparator);
if (index < 0) {
index = -index-1 ;
}
}
s=System.currentTimeMillis();
List<Person> leftList = table.getItems().subList(0, index);
List<Person> rightList = table.getItems().subList(index, table.getItems().size());
List<Person> newList = new ArrayList<Person>(table.getItems().size()+1);
newList.addAll(leftList);
newList.add(person);
newList.addAll(rightList);
/* int selectedIndex = table.getSelectionModel().getSelectedIndex();
if (index < selectedIndex) {
selectedIndex++;
} */
table.getItems().setAll(newList);
// table.getSelectionModel().select(selectedIndex);
e= System.currentTimeMillis() - s;
avg+=e;
if(mx<e)
mx=e;
if(mn>e)
mn=e;
if(count==1000)
{
avg=avg/10000;
System.out.format("current System time is %f. Max is %d . Min is %d%n",avg,mx,mn);
count=0;
avg=0;
mx=0;
mn=100000000;
}
}
public static class Person {
private final StringProperty firstName ;
private final StringProperty lastName ;
Person(String firstName, String lastName) {
this.firstName = new SimpleStringProperty(this, "firstName", firstName);
this.lastName = new SimpleStringProperty(this, "lastName", lastName);
}
public String getFirstName() { return firstName.get(); }
public void setFirstName(String firstName) { this.firstName.set(firstName);}
public StringProperty firstNameProperty() { return firstName ; }
public String getLastName() { return lastName.get(); }
public void setLastName(String lastName) { this.lastName.set(lastName); }
public StringProperty lastNameProperty() { return lastName ; }
@Override public String toString() { return firstName.get() + " " + lastName.get() ; }
}
}
这条线在开始
//this line increase speed but then we can not even click on table as it will give someexception
table.setSelectionModel(null);
帮助我将平均插入速度提高到0.2毫秒（用于计算平均值的代码包含在代码中）
但它禁用任何选择（由于这个原因， addPersonToTable中的代码被注释）
我希望能够选择一行，但该代码具有一定的速度效率。（我使用了 Jprofiler，它显示主要时间花在TableCell.onChanged上）
注意：这段代码是 James_D 写的，我只是稍微修改了一下（添加行 table.setSelectionModel(null); 和 addPersonToTable 中的注释行）
