我一直在尝试使用 JavaFX 在 TableView
中格式化 Long
值。
我有以下类来存储我想要在表格上显示的行:
import java.text.DecimalFormat;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleLongProperty;
import javafx.beans.property.SimpleStringProperty;
public class DataByCurrencyPairRow {
private DecimalFormat integerFormat = new DecimalFormat("#,###");
private SimpleStringProperty currencyPair = new SimpleStringProperty("");
private SimpleDoubleProperty shareOfTotalVolume = new SimpleDoubleProperty(0);
private SimpleLongProperty totalVolume = new SimpleLongProperty(0);
private SimpleLongProperty currencyBought = new SimpleLongProperty(0);
private SimpleLongProperty currencySold = new SimpleLongProperty(0);
private SimpleLongProperty monthlyAverage = new SimpleLongProperty(0);
public DataByCurrencyPairRow() {
currencyPair.set("");
shareOfTotalVolume.set(0);
totalVolume.set(0);
currencyBought.set(0);
currencySold.set(0);
monthlyAverage.set(0);
}
public String getCurrencyPair() {
return currencyPair.getValue();
}
public void setCurrencyPair(String currencyPair) {
this.currencyPair.setValue(currencyPair);
}
public Long getMonthlyAverage() {
return monthlyAverage.getValue();
}
public void setMonthlyAverage(Long monthlyAverage) {
this.monthlyAverage.setValue(monthlyAverage);
}
public Long getCurrencySold() {
return currencySold.getValue();
}
public void setCurrencySold(Long currencySold) {
this.currencySold.setValue(currencySold);
}
public Long getCurrencyBought() {
return currencyBought.getValue();
}
public void setCurrencyBought(Long currencyBought) {
this.currencyBought.setValue(currencyBought);
}
public Long getTotalVolume() {
return totalVolume.getValue();
}
public void setTotalVolume(Long totalVolume) {
this.totalVolume.setValue(totalVolume);
}
public Double getShareOfTotalVolume() {
return shareOfTotalVolume.getValue();
}
public void setShareOfTotalVolume(Double shareOfTotalVolume) {
this.shareOfTotalVolume.setValue(shareOfTotalVolume);
}
}
然后我有一个带有 initialize
方法的 Controller ,我一直在尝试重写 updateItem
方法以使表格将逗号显示为千位分隔符:
public class MainController {
private static final String DEFAULT_TIME_HORIZON = new String("0");
private final NumberFormat integerFormat = new DecimalFormat("#,###");
@FXML
TableView<DataByCurrencyPairRow> tableTransactionsByCurrencyPair;
@FXML
TableColumn<DataByCurrencyPairRow, Long> columnTotal;
@FXML
void initialize() {
columnTotal.setCellFactory(
new Callback<TableColumn<DataByCurrencyPairRow, SimpleLongProperty>, TableCell<DataByCurrencyPairRow, SimpleLongProperty>>() {
@Override
public TableCell<DataByCurrencyPairRow, SimpleLongProperty> call(TableColumn<DataByCurrencyPairRow, SimpleLongProperty> param
) {
return new TableCell<DataByCurrencyPairRow, SimpleLongProperty>() {
@Override
protected void updateItem(SimpleLongProperty item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setText("0");
setStyle("");
} else {
setText(integerFormat.format(item.longValue()));
}
}
};
}
}
);
这是填充TableView
的方法:
public void updateByCurrencyPairTable() {
System.out.println("#MainController: Updating data in table view Markets volumes by currency pair");
ObservableList<DataByCurrencyPairRow> data = tableTransactionsByCurrencyPair.getItems();
data.clear();
// Add row items to the table view Markets volume by currency
for (DataByCurrencyPairRow row : customer.getDataByCurrencyPairR12m().getDataByCurrencyPair()) {
data.add(row);
}
}
请帮助我展示如何做到这一点!我还尝试将 updateItem
方法重写为 Long
而不是 SimpleLongProperty
并且我的 IDE 接受了代码,但数字仍然没有在表中格式化.
先谢谢大家了!!!
最佳答案
LongProperty
实现ObservableValue<Number>
,不是ObservableValue<Long>
(或ObservableValue<SimpleLongProperty>
)。因此,您的表列需要为 TableColumn<DataByCurrencyPair, Number>
类型您的细胞工厂需要相应地匹配这些类型。
这是一个带有 Long
的格式化列的简单示例s:
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Random;
import javafx.application.Application;
import javafx.beans.property.LongProperty;
import javafx.beans.property.SimpleLongProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.scene.Scene;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.stage.Stage;
public class TableWithFormattedLong extends Application {
private final NumberFormat integerFormat = new DecimalFormat("#,###");
@Override
public void start(Stage primaryStage) {
TableView<Item> table = new TableView<>();
TableColumn<Item, String> itemColumn = new TableColumn<>("Item");
itemColumn.setCellValueFactory(cellData -> cellData.getValue().nameProperty());
TableColumn<Item, Number> valueColumn = new TableColumn<>("Value");
valueColumn.setCellValueFactory(cellData -> cellData.getValue().valueProperty());
valueColumn.setCellFactory(tc -> new TableCell<Item, Number>() {
@Override
protected void updateItem(Number value, boolean empty) {
super.updateItem(value, empty);
if (value == null || empty) {
setText("");
} else {
setText(integerFormat.format(value));
}
}
});
table.getColumns().add(itemColumn);
table.getColumns().add(valueColumn);
Random rng = new Random();
for (int i = 1 ; i <= 20 ; i++) {
table.getItems().add(new Item("Item "+i, rng.nextLong()));
}
primaryStage.setScene(new Scene(table, 600, 600));
primaryStage.show();
}
public static class Item {
private final StringProperty name = new SimpleStringProperty();
private final LongProperty value = new SimpleLongProperty();
public Item(String name, long value) {
setName(name);
setValue(value);
}
public final StringProperty nameProperty() {
return this.name;
}
public final String getName() {
return this.nameProperty().get();
}
public final void setName(final String name) {
this.nameProperty().set(name);
}
public final LongProperty valueProperty() {
return this.value;
}
public final long getValue() {
return this.valueProperty().get();
}
public final void setValue(final long value) {
this.valueProperty().set(value);
}
}
public static void main(String[] args) {
launch(args);
}
}
关于TableView 中的 JavaFX 格式 SimpleLongProperty,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38571211/