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| <title>Writing a Hello World with RAP</title> |
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| |
| <h1>Creating a Hello World with RAP</h1> |
| <p> |
| This document describes how to quickly create and launch a first user interface with RAP. |
| A complete application includes a few more components, depending on your |
| <a href = "application-setup.html">application setup</a>. |
| </p> |
| |
| <h2>Preconditions</h2> |
| <ul> |
| <li><a href="setup-ide.html">the RAP Tools are installed</a></li> |
| <li><a href="target-install.html">a RAP target platform is installed and active</a></li> |
| </ul> |
| |
| <h2>Create a new project</h2> |
| <p> |
| First we need to create a project for your application. |
| It is recommended to use a <em>Plug-in Project</em>, |
| unless you want to write an <a href = "rwt-standalone">RAP applications |
| without OSGi</a>. In the latter case, you can also create a plain <em>Java Project</em> here. |
| (If you do so, the project setup will differ slightly from this tutorial. Most notably, you |
| will have to add <em>org.eclipse.rap.rwt</em> to the java build path/ |
| <em class="UILabel">Required Projects</em> in the next step.) |
| </p><p> |
| From the menu, select <em class="UILabel">File > New > Plug-in Project</em>. |
| Let's call the plug-in <code>org.example.rap.helloworld</code>. |
| In the <em class="UILabel">Target Platform</em> box, choose |
| <em class="UILabel">Eclipse version</em> and <em class="UILabel">3.5 or greater</em> to create a |
| bundle that is compatible with Eclipse. |
| </p> |
| <img src="../images/hello-world/NewProject-1.png" alt="New Project Wizard"/> |
| <p> |
| On the second page of the wizard, disable the option |
| <em class="UILabel">Generate an activator</em>. |
| (This option would create a bundle activator, but we don't need that now.) |
| Ensure that no <em class="UILabel">Rich Client Application</em> will be created. |
| </p> |
| <img src="../images/hello-world/NewProject-2.png" alt="New Project Wizard"/> |
| <p> |
| On the next page select the <em class="UILabel">RAP Hello World</em> template. |
| </p> |
| <img src="../images/hello-world/NewProject-3.png" alt="New Project Wizard"/> |
| <p> |
| Set the <em class="UILabel">Application window title</em> and |
| <em class="UILabel">Package name</em> and click "Finish". |
| </p> |
| <img src="../images/hello-world/NewProject-4.png" alt="New Project Wizard"/> |
| |
| <p> |
| The wizard will create all needed classes for your RAP application. |
| </p> |
| <h2 id="entrypoint">Create the application UI</h2> |
| <p> |
| Every RAP application needs an entry point class that creates the initial UI of the application. |
| </p> |
| <p> |
| The wizard automatically creates a class named <em>BasicEntryPoint</em> that extends |
| <em><a href="../reference/api/org/eclipse/rap/rwt/application/AbstractEntryPoint.html">AbstractEntryPoint</a></em> |
| in the speified package. In the method |
| <em><a href="../reference/api/org/eclipse/rap/rwt/application/AbstractEntryPoint.html#createContents(org.eclipse.swt.widgets.Composite)">createContents</a></em>, |
| we already have some SWT code with two buttons. |
| </p> |
| <pre class="lang-java"> |
| public class BasicEntryPoint extends AbstractEntryPoint { |
| |
| @Override |
| protected void createContents(Composite parent) { |
| parent.setLayout(new GridLayout(2, false)); |
| Button checkbox = new Button(parent, SWT.CHECK); |
| checkbox.setText("Hello"); |
| Button button = new Button(parent, SWT.PUSH); |
| button.setText("World"); |
| } |
| |
| } </pre> |
| |
| <h2>Launch the application</h2> |
| <p> |
| Now we can launch this application using the generated launch configuration |
| <em>org.examples.rap.helloworld.launch</em> in the project root. |
| Select <em class="UILabel">Run As > org.examples.rap.helloworld</em> from the context menu |
| of the launch configuration file. |
| A browser view should open up soon afterwards and show your running application. |
| More information on launching RAP applications can be found in the chapter |
| <a href="./launcher.html">Launching RAP Applications</a>. |
| </p> |
| |
| </body> |
| </html> |
