Applicationwindow_java Programming of SWT (JFace) Experience

The test code is as follows:

Copy Code code as follows:

Package Swt_jface.demo;
Import Org.eclipse.jface.window.ApplicationWindow;
Import Org.eclipse.swt.SWT;
Import org.eclipse.swt.events.ModifyEvent;
Import Org.eclipse.swt.events.ModifyListener;
Import Org.eclipse.swt.layout.GridLayout;
Import Org.eclipse.swt.widgets.Composite;
Import Org.eclipse.swt.widgets.Control;
Import Org.eclipse.swt.widgets.Display;
Import Org.eclipse.swt.widgets.Label;
Import Org.eclipse.swt.widgets.Text;
public class Temperatureconverterjface extends Applicationwindow {
Label Fahrenheitlabel;
Label Celsiuslabel;
Text Fahrenheitvalue;
Text Celsiusvalue;

Public Temperatureconverterjface () {

Super (NULL);

Addstatusline ();
}
Protected control createcontents (composite parent) {
Getshell (). SetText ("JFace temperature Converter");

Composite Convertercomposite = new Composite (parent, SWT. NULL);

Convertercomposite.setlayout (New GridLayout (4, false));
Fahrenheitlabel = new Label (Convertercomposite, SWT. NULL);
Fahrenheitlabel.settext ("Fahrenheit:");
Fahrenheitvalue = new Text (Convertercomposite, SWT. Single | Swt. BORDER);
Celsiuslabel = new Label (Convertercomposite, SWT. NULL);
Celsiuslabel.settext ("Celsius:");
Celsiusvalue = new Text (Convertercomposite, SWT. Single | Swt. BORDER);
Modifylistener listener = new Modifylistener () {
public void Modifytext (Modifyevent e) {
ValueChanged ((Text) e.widget);
}
};
Fahrenheitvalue.addmodifylistener (listener);
Celsiusvalue.addmodifylistener (listener);

return convertercomposite;
}
public void valuechanged (text text) {
if (!text.isfocuscontrol ())
Return
if (Text = = Fahrenheitvalue) {
try {
Double fvalue = double.parsedouble (Text.gettext ());
Double cvalue = (fValue-32)/1.8;
Celsiusvalue.settext (double.tostring (cvalue));
System.out.println ("F-> C:" + cvalue);
SetStatus ("Conversion performed successfully.");
catch (NumberFormatException e) {
Celsiusvalue.settext ("");
SetStatus ("Invalid number format:" + Text.gettext ());
}
} else {
try {
Double cvalue = double.parsedouble (Text.gettext ());
Double Fvalue = cvalue * 1.8 + 32;
Fahrenheitvalue.settext (double.tostring (Fvalue));
System.out.println ("C-> F:" + fvalue);
SetStatus ("Conversion performed successfully.");
catch (NumberFormatException e) {
Fahrenheitvalue.settext ("");
SetStatus ("Invalid number format:" + Text.gettext ());
}
}
}

public static void Main (string[] args) {
Temperatureconverterjface converter = new Temperatureconverterjface ();
Converter.setblockonopen (TRUE);
Converter.open ();
Display.getcurrent (). Dispose ();
}
}

Solutions that do not use Applicationwindow (that is, just SWT classes):

Copy Code code as follows:

Package Swt_jface.demo;
Import Org.eclipse.swt.SWT;
Import org.eclipse.swt.events.ModifyEvent;
Import Org.eclipse.swt.events.ModifyListener;
Import Org.eclipse.swt.layout.GridData;
Import Org.eclipse.swt.layout.GridLayout;
Import Org.eclipse.swt.widgets.Display;
Import Org.eclipse.swt.widgets.Label;
Import Org.eclipse.swt.widgets.Shell;
Import Org.eclipse.swt.widgets.Text;
public class Temperatureconverter {

Display display = new display ();
Shell shell = new shell (display);
Label Fahrenheitlabel;
Label Celsiuslabel;
Label Messagelabel;
Text Fahrenheitvalue;
Text Celsiusvalue;
Public Temperatureconverter () {

Shell.settext ("SWT temperature Converter");
Shell.setlayout (New GridLayout (4, false));
Fahrenheitlabel = new Label (Shell, SWT. NULL);
Fahrenheitlabel.settext ("Fahrenheit:");
Fahrenheitvalue = new Text (Shell, SWT. Single | Swt. BORDER);
Celsiuslabel = new Label (Shell, SWT. NULL);
Celsiuslabel.settext ("Celsius:");
Celsiusvalue = new Text (Shell, SWT. Single | Swt. BORDER);

Messagelabel = new Label (Shell, SWT. BORDER);
Griddata griddata = new Griddata (Griddata.fill_both);
Griddata.horizontalspan = 4;
Messagelabel.setlayoutdata (Griddata);
Modifylistener listener = new Modifylistener () {
public void Modifytext (Modifyevent e) {
ValueChanged ((Text) e.widget);
}
};
Fahrenheitvalue.addmodifylistener (listener);
Celsiusvalue.addmodifylistener (listener);
Shell.pack ();
Shell.open ();
while (!shell.isdisposed ()) {
if (!display.readanddispatch ()) {
Display.sleep ();
}
}
Display.dispose ();
}
public void valuechanged (text text) {
if (!text.isfocuscontrol ())
Return
if (Text = = Fahrenheitvalue) {
try {
Double fvalue = double.parsedouble (Text.gettext ());
Double cvalue = (fValue-32)/1.8;
Celsiusvalue.settext (double.tostring (cvalue));
System.out.println ("F-> C:" + cvalue);
Messagelabel.settext ("Conversion performed successfully.");
catch (NumberFormatException e) {
Celsiusvalue.settext ("");
Messagelabel.settext ("Invalid number format:" + Text.gettext ());
}
} else {
try {
Double cvalue = double.parsedouble (Text.gettext ());
Double Fvalue = cvalue * 1.8 + 32;
Fahrenheitvalue.settext (double.tostring (Fvalue));
System.out.println ("C-> F:" + fvalue);
Messagelabel.settext ("Conversion performed successfully.");
catch (NumberFormatException e) {
Fahrenheitvalue.settext ("");
Messagelabel.settext ("Invalid number format:" + Text.gettext ());
}
}
}
public static void Main (string[] args) {
New Temperatureconverter ();
}
}