J3002. JavaFX Component Extensions (ii)--stringfield

When we work with string-type data on the interface, we generally need to do the following basic controls:

First, provide default values;

Second, confirm whether can be empty;

Third, limit the maximum input length (support Chinese judgment);

The TextField provided by JavaFX does not provide the functionality described above, so we need to extend it.

Stringfield class:

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 Textfiel    d {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 (); Limit input Maximum length textproperty (). AddListener ((Observablevalue, OldValue, NewValue), {if (!checkvalueleng            Thvalid (NewValue)) {setText (oldValue);        }        }); Set maximum allowable length if (maxLength = = null) {maxLength =-1;        } setmaxlength (MaxLength);        if (Isnotblank (defaultvalue)) {//Set default value SetText (defaultvalue); }} protected Boolean Checkvaluelengthvalid (final String value) {if (Getmaxlength ()! = null && GETMA Xlength () > 0 && isnotblank (getText ()) && lenofchinesstring (value) > Getmaxlength ()) {RE        Turn 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); }//recommends using the StringUtils class public static Boolean Isnotblank (Final String str) {return (ST) provided in Apache Commons-lang3 R! = NULL &&! "".    Equalsignorecase (str));        }//should be used as a tool method 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; }}

Test class:

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&LT;BR&G T * company:lrjap.com<br> * * @author YUJJ * @version 1.1.1 * @date 2018-04-29 * @since 9.0.4 */public class Teststri    Ngfield 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);        Place two Stringfield label lblcode in gridpane = new label ("Code:");        Stringfield Stringcode = new Stringfield ();        Set the maximum input length stringcode.setmaxlength (8);        Label Lblname = new Label ("Name:");        Set the maximum input length and the default value Stringfield Stringname = new Stringfield ("Demoname");        Label right-aligned 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 (); }}

Operating effect:

J3002. JavaFX Component Extensions (ii)--stringfield