Create SWT library and use it in SWT app

We already prepared SWT app for multiproject build. Now we create SWT library and use it in SWT app.

Create SWT library

Create folder "tutorials/MySwtLib", create file "build.gradle" in it, insert code:

apply plugin: 'java'
apply plugin: 'org.akhikhl.wuff.swt-lib'

Create folder "tutorials/MySwtLib/src/main/java/myswtlib", create file "HelloWorld.java" in it, insert code:

package myswtlib;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Shell;

public class HelloWorld {

  public static void showMessageDialog(Shell shell) {
    MessageDialog.openQuestion(shell, "Information", "I am SWT library!");
  }
}

Edit file "tutorials/settings.gradle", insert code:

include 'MySwtLib'

so that there are two includes - "MySwtApp" and "MySwtLib".

Use SWT library in SWT app

Edit file "tutorials/MySwtApp/build.gradle", insert code:

dependencies {
  compile project(':MySwtLib')
}

Edit file "tutorials/MySwtApp/src/main/java/myswtapp/Main.java", replace content with:

package myswtapp;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

import myswtlib.HelloWorld;

public final class Main {

  public static void main(String[] args) {
    Display display = new Display();
    try {
      final Shell shell = new Shell(display);
      shell.setText("SWT app");
      shell.setLayout(new GridLayout(5, true));
      Button btnShowDialog = new Button(shell, SWT.PUSH);
      btnShowDialog.setText("Show dialog");
      btnShowDialog.setLayoutData(new GridData());
      btnShowDialog.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent event) {
          HelloWorld.showMessageDialog(shell);
        }
      });
      shell.open();
      while (!shell.isDisposed())
        if (!display.readAndDispatch())
          display.sleep();
    } finally {
      display.dispose();
    }
  }
}

Compile

Invoke on command line in "tutorials" folder: gradle build

Check: folder "tutorials/MySwtLib/build/libs" must contain file "MySwtLib-1.0.jar", which is non-OSGi library.

Check: each product in "tutorials/MySwtApp/build/output" must contain monolithic JAR and launch scripts.

Check: each monolithic JAR must contain "MySwtApp" library in "main" folder and "MySwtLib" library in "lib" folder.

Run

Run the compiled product from command line. Expect to see:

When we click on "Show dialog" button, the program shows message dialog:

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The example code for this page: examples/SwtApp-4.

Next page: localize SWT app.