Java 使用文本字段编辑货币
如何获取JavaFX文本字段来编辑存储在没有派系数字(例如long)的货币?使用数据绑定、TextFormatter和其他javaFX工具 目标应该是:Java 使用文本字段编辑货币,java,javafx,binding,currency,Java,Javafx,Binding,Currency,如何获取JavaFX文本字段来编辑存储在没有派系数字(例如long)的货币?使用数据绑定、TextFormatter和其他javaFX工具 目标应该是: 具有LongProperty的Bo(货币价值单位:美分) 用户已知格式的可编辑文本字段(可选前导减号, 千位分隔符、十进制分隔符(货币符号),无其他 (可能的话) Bo和文本字段之间的双向绑定 这里有一个解决方案(可能不是最好的,如果我可以改进,请评论) Bo: import java.util.Random; import javafx.
- 具有LongProperty的Bo(货币价值单位:美分)
- 用户已知格式的可编辑文本字段(可选前导减号, 千位分隔符、十进制分隔符(货币符号),无其他 (可能的话)
- Bo和文本字段之间的双向绑定
- 这里有一个解决方案(可能不是最好的,如果我可以改进,请评论)
Bo:
import java.util.Random;
import javafx.beans.property.LongProperty;
import javafx.beans.property.SimpleLongProperty;
public class SimpleBo {
//a simple LongProperty to store the currency without fractional digits (56,81 € would be 5681)
private LongProperty currencyLong = new SimpleLongProperty();
public SimpleBo() {
setCurrencyLong(new Random().nextLong());
}
public final LongProperty currencyLongProperty() {
return this.currencyLong;
}
public final long getCurrencyLong() {
return this.currencyLongProperty().get();
}
public final void setCurrencyLong(final long currencyLong) {
this.currencyLongProperty().set(currencyLong);
}
}
数字到字符串转换器:
import java.text.NumberFormat;
import java.util.Locale;
import javafx.util.converter.NumberStringConverter;
public class MyNumberStringConverter extends NumberStringConverter {
public MyNumberStringConverter() {
super();
}
public MyNumberStringConverter(Locale locale, String pattern) {
super(locale, pattern);
}
public MyNumberStringConverter(Locale locale) {
super(locale);
}
public MyNumberStringConverter(NumberFormat numberFormat) {
super(numberFormat);
}
public MyNumberStringConverter(String pattern) {
super(pattern);
}
@Override
public Number fromString(String value) {
//to transform the double, given by the textfield, just multiply by 100 and round if any left
Number rValue = Math.round(super.fromString(value).doubleValue() * 100);
return rValue.longValue();
}
@Override
public String toString(Number value) {
if(value == null) {
return "";
}
//Check for too big long value
//If the long is too big, it could result in a strange double value.
if(value.longValue() > 1000000000000l || value.longValue() < -1000000000000l ) {
return "";
}
BigDecimal myBigDecimal = new BigDecimal(value.longValue());
//to convert the long to a double (currency with fractional digits)
myBigDecimal = myBigDecimal.movePointLeft(2);
double asDouble = myBigDecimal.doubleValue();
if(asDouble == Double.NEGATIVE_INFINITY || asDouble == Double.POSITIVE_INFINITY) {
return "";
}
return super.toString(asDouble);
}
导入java.text.NumberFormat;
导入java.util.Locale;
导入javafx.util.converter.NumberStringConverter;
公共类MyNumberStringConverter扩展了NumberStringConverter{
公共MyNumberStringConverter(){
超级();
}
公共MyNumberStringConverter(区域设置,字符串模式){
超级(地点、模式);
}
公共MyNumberStringConverter(区域设置){
超级(现场);
}
公共MyNumberStringConverter(NumberFormat NumberFormat){
超级(数字格式);
}
公共MyNumberStringConverter(字符串模式){
超级(模式);
}
@凌驾
公共编号fromString(字符串值){
//要转换文本字段给出的double,只需乘以100,如果有,则进行四舍五入
数字rValue=Math.round(super.fromString(value).doubleValue()*100);
返回rValue.longValue();
}
@凌驾
公共字符串到字符串(数值){
如果(值==null){
返回“”;
}
//检查长值是否太大
//如果long太大,可能会导致奇怪的双精度值。
如果(value.longValue()>10000000000l | | value.longValue()<-10000000000l){
返回“”;
}
BigDecimal myBigDecimal=新的BigDecimal(value.longValue());
//将long转换为double(带小数位数的货币)
myBigDecimal=myBigDecimal.movePointLeft(2);
double asDouble=myBigDecimal.doubleValue();
if(asDouble==Double.NEGATIVE | | asDouble==Double.NEGATIVE |{
返回“”;
}
返回super.toString(asDouble);
}
Util类:
import java.util.function.UnaryOperator;
import javafx.scene.control.TextFormatter;
public class Util {
// This will filter the changes
public static UnaryOperator<TextFormatter.Change> createFilter() {
//this is a simple Regex to define the acceptable Chars
String validEditingStateRegex = "[0123456789,.-]*";
return change -> {
String text = change.getText();
//Check if something changed and just return if not
if (!change.isContentChange()) {
return change;
}
//check if the changed text validates against the regex
if (text.matches(validEditingStateRegex) || text.isEmpty()) {
//if valid return the change
return change;
}
//otherwise return null
return null;
};
}
}
import java.util.function.UnaryOperator;
导入javafx.scene.control.TextFormatter;
公共类Util{
//这将过滤更改
公共静态一元运算符createFilter(){
//这是一个定义可接受字符的简单正则表达式
字符串validEditingStateRegex=“[0123456789,.-]*”;
返回更改->{
String text=change.getText();
//检查是否有更改,如果没有,请返回
如果(!change.isContentChange()){
回报变化;
}
//检查更改的文本是否根据正则表达式进行验证
if(text.matches(validEditingStateRegex)| | text.isEmpty()){
//如果有效,请返回更改
回报变化;
}
//否则返回null
返回null;
};
}
}
测试应用:
import java.text.NumberFormat;
import javafx.application.Application;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.TextFormatter;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class BindingExample extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
Scene scene = new Scene(createBindingExample());
primaryStage.setScene(scene);
primaryStage.show();
}
//Creates just a sample gui with a Business Objekt
public static Parent createBindingExample() {
VBox vbox = new VBox();
SimpleBo myBo = new SimpleBo();
TextField myTextField = new TextField();
Label fooLabel = new Label();
//Setting up the textField with a Formatter
NumberFormat nFormat = NumberFormat.getInstance();
//Define the integer and fractional digits
nFormat.setMinimumIntegerDigits(1);
nFormat.setMaximumFractionDigits(2);
//setting up the TextFormatter with the NumberFormat and a Filter to limit the inputchars
TextFormatter<Number> textFormatter = new TextFormatter<>(new MyNumberStringConverter(nFormat), 0l,
Util.createFilter());
//Bind (Bidirectional) the BO currency value to the textformatter value
textFormatter.valueProperty().bindBidirectional(myBo.currencyLongProperty());
myTextField.setTextFormatter(textFormatter);
//just to show the currency value, bind it to the label
fooLabel.textProperty().bind(myBo.currencyLongProperty().asString());
vbox.getChildren().add(myTextField);
//just for spacing
vbox.getChildren().add(new Label(" "));
vbox.getChildren().add(fooLabel);
return vbox;
}
}
导入java.text.NumberFormat;
导入javafx.application.application;
导入javafx.scene.Parent;
导入javafx.scene.scene;
导入javafx.scene.control.Label;
导入javafx.scene.control.TextField;
导入javafx.scene.control.TextFormatter;
导入javafx.scene.layout.VBox;
导入javafx.stage.stage;
公共类绑定示例扩展了应用程序{
公共静态void main(字符串[]args){
发射(args);
}
@凌驾
public void start(Stage primaryStage)引发异常{
场景=新场景(createBindingExample());
初级阶段。场景(场景);
primaryStage.show();
}
//仅创建一个带有业务对象的示例gui
公共静态父createBindingExample(){
VBox VBox=新的VBox();
SimpleBo myBo=新SimpleBo();
TextField myTextField=新建TextField();
标签标签=新标签();
//使用格式化程序设置文本字段
NumberFormat info=NumberFormat.getInstance();
//定义整数和小数位数
信息格式设置最小整数位数(1);
信息格式setMaximumFractionDigits(2);
//使用NumberFormat和筛选器设置TextFormatter以限制输入字符
TextFormatter TextFormatter=新的TextFormatter(新的MyNumberStringConverter(nFormat),0l,
Util.createFilter());
//将BO货币值绑定(双向)到textformatter值
textFormatter.valueProperty().bindBidirectional(myBo.currencyLongProperty());
myTextField.setTextFormatter(textFormatter);
//为了显示货币值,请将其绑定到标签
doubabel.textProperty().bind(myBo.currencyLongProperty().asString());
vbox.getChildren().add(myTextField);
//只是为了间隔
vbox.getChildren().add(新标签(“”);
vbox.getChildren().add(傻瓜标签);
返回vbox;
}
}
您可以将文本字段放在HBox中,并为货币符号添加一个标签。或者使用一个货币符号下拉框或其他任何东西。可以将数字格式与货币一起使用,这样格式就可以添加符号。但这还有一些其他缺点,所以我选择了这种方式。这里有一个解决方案(可能不是最好的,如果我能改进,请评论)
Bo:
import java.util.Random;
import javafx.beans.property.LongProperty;
import javafx.beans.property.SimpleLongProperty;
public class SimpleBo {
//a simple LongProperty to store the currency without fractional digits (56,81 € would be 5681)
private LongProperty currencyLong = new SimpleLongProperty();
public SimpleBo() {
setCurrencyLong(new Random().nextLong());
}
public final LongProperty currencyLongProperty() {
return this.currencyLong;
}
public final long getCurrencyLong() {
return this.currencyLongProperty().get();
}
public final void setCurrencyLong(final long currencyLong) {
this.currencyLongProperty().set(currencyLong);
}
}
数字到字符串转换器:
import java.text.NumberFormat;
import java.util.Locale;
import javafx.util.converter.NumberStringConverter;
public class MyNumberStringConverter extends NumberStringConverter {
public MyNumberStringConverter() {
super();
}
public MyNumberStringConverter(Locale locale, String pattern) {
super(locale, pattern);
}
public MyNumberStringConverter(Locale locale) {
super(locale);
}
public MyNumberStringConverter(NumberFormat numberFormat) {
super(numberFormat);
}
public MyNumberStringConverter(String pattern) {
super(pattern);
}
@Override
public Number fromString(String value) {
//to transform the double, given by the textfield, just multiply by 100 and round if any left
Number rValue = Math.round(super.fromString(value).doubleValue() * 100);
return rValue.longValue();
}
@Override
public String toString(Number value) {
if(value == null) {
return "";
}
//Check for too big long value
//If the long is too big, it could result in a strange double value.
if(value.longValue() > 1000000000000l || value.longValue() < -1000000000000l ) {
return "";
}
BigDecimal myBigDecimal = new BigDecimal(value.longValue());
//to convert the long to a double (currency with fractional digits)
myBigDecimal = myBigDecimal.movePointLeft(2);
double asDouble = myBigDecimal.doubleValue();
if(asDouble == Double.NEGATIVE_INFINITY || asDouble == Double.POSITIVE_INFINITY) {
return "";
}
return super.toString(asDouble);
}
导入java.text.NumberFormat;
导入java.util.Locale;
导入javafx.util.converter.NumberStringConverter;
公共类MyNumberStringConverter扩展了NumberStringConverter{
公共MyNumberStringConverter(){
超级();
}
公共MyNumberStringConverter(区域设置,字符串模式){
超级(地点、模式);