标签:utils auth text extends bool util 限制 max get
我们在界面上处理String类型的数据时,一般需要做到以下基本控制:
一、提供默认值;
二、确认是否可以为空;
三、限定最大输入长度(支持中文判断);
JavaFX提供的TextField并没有提供上述功能,所以我们需要对其进行扩展。
StringField类:
package com.lirong.javafx.demo.j3002;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.control.TextField;
/**
* <p>Title: LiRong Java Application Platform</p>
* Description: <br>
* Copyright: CorpRights lrJAP.com<br>
* Company: lrJAP.com<br>
*
* @author yujj
* @version 1.1.1
* @date 2018-04-29
* @since 9.0.4
*/
public class StringField extends TextField {
private IntegerProperty maxLength = new SimpleIntegerProperty();
public StringField() {
this(-1, null);
}
public StringField(final Integer maxLength) {
this(maxLength, null);
}
public StringField(Integer maxLength, final String defaultValue) {
super();
// 限制输入最大长度
textProperty().addListener((observableValue, oldValue, newValue) -> {
if (!checkValueLengthValid(newValue)) {
setText(oldValue);
}
});
// 设置最大允许长度
if (maxLength == null) {
maxLength = -1;
}
setMaxLength(maxLength);
if (isNotBlank(defaultValue)) {
// 设置默认值
setText(defaultValue);
}
}
protected boolean checkValueLengthValid(final String value) {
if (getMaxLength() != null && getMaxLength() > 0 && isNotBlank(getText()) && lenOfChinesString(value) > getMaxLength()) {
return Boolean.FALSE;
}
return Boolean.TRUE;
}
public Integer getMaxLength() {
return maxLength.get();
}
public IntegerProperty maxLengthProperty() {
return maxLength;
}
public void setMaxLength(Integer maxLength) {
this.maxLength.set(maxLength);
}
// 建议使用apache commons-lang3中提供的StringUtils类
public static boolean isNotBlank(final String str) {
return (str != null && !"".equalsIgnoreCase(str));
}
// 应作为工具方法
public static int lenOfChinesString(final String str) {
int len = 0;
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
if (c >= ‘\u4e00‘ && c <= ‘\u9fa5‘) {
len += 2;
} else {
len++;
}
}
return len;
}
}
测试类:
package com.lirong.javafx.demo.j3002;
import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
/**
* <p>Title: LiRong Java Application Platform</p>
* Description: <br>
* Copyright: CorpRights lrJAP.com<br>
* Company: lrJAP.com<br>
*
* @author yujj
* @version 1.1.1
* @date 2018-04-29
* @since 9.0.4
*/
public class TestStringField extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
GridPane gridPane = new GridPane();
gridPane.setPadding(new Insets(10));
gridPane.setVgap(10);
gridPane.setHgap(10);
ColumnConstraints col1 = new ColumnConstraints();
col1.setPercentWidth(40);
ColumnConstraints col2 = new ColumnConstraints();
col2.setPercentWidth(60);
gridPane.getColumnConstraints().addAll(col1, col2);
// 在GridPane中放置两个StringField
Label lblCode = new Label("编码:");
StringField stringCode = new StringField();
// 设置最大输入长度
stringCode.setMaxLength(8);
Label lblName = new Label("名称:");
// 设置最大输入长度以及默认值
StringField stringName = new StringField(16, "DemoName");
// label右对齐
GridPane.setHalignment(lblCode, HPos.RIGHT);
GridPane.setHalignment(lblName, HPos.RIGHT);
gridPane.addRow(0, lblCode, stringCode);
gridPane.addRow(1, lblName, stringName);
Scene scene = new Scene(gridPane, 400, 300);
primaryStage.setScene(scene);
primaryStage.show();
}
}
运行效果:
J3002.JavaFX组件扩展(二)——StringField
标签:utils auth text extends bool util 限制 max get
原文地址:https://www.cnblogs.com/yujj-cn/p/8977207.html