Create Eclipse bundle and use it in RCP app

We already prepared RCP app for multiproject build. Now we create Eclipse plugin and use it in RCP app.

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

apply plugin: 'java'
apply plugin: 'eclipse-bundle'

2. Create folder "tutorials/MyPlugin/src/main/java/myplugin", create file "HelloWorld.java" in it, insert code:

package myplugin;

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 Eclipse plugin!");
  }
}

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

include 'MyPlugin'

so that there are two includes - "MyRcpApp" and "MyPlugin".

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

dependencies {
  compile project(':MyPlugin')
}

5. Edit file "tutorials/MyRcpApp/src/main/java/myrcpapp/View.java", replace content with:

package myrcpapp;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.ui.part.ViewPart;

public class View extends ViewPart {

  @Override
  public void createPartControl(final Composite parent) {
    parent.setLayout(new RowLayout());
    Button btnShowDialog = new Button(parent, SWT.PUSH);
    btnShowDialog.setText("Show dialog");
    btnShowDialog.addSelectionListener(new SelectionAdapter() {
      @Override
      public void widgetSelected(SelectionEvent event) {
        myplugin.HelloWorld.showMessageDialog(parent.getShell());
      }
    });
  }

  @Override
  public void setFocus() {
  }
}

6. Invoke on command line in "tutorials" folder:

gradle build

CHECK: folder "tutorials/MyPlugin/build/libs" contains file "MyPlugin-1.0.0.0.jar", which is proper OSGi bundle with automatically generated manifest.

CHECK: Each product in "tutorials/MyRcpApp/build/output" contains "MyPlugin" and "MyRcpApp" bundles in "plugins" subfolder and in "configuration/config.ini".

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

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

The example code for this page: tutorialExamples/RcpApp-4.

Next page: add splash to RCP app.