gef编辑器中需要采用向导页

    在一般的gef编辑器中需要采用向导页，生成一个格式的gef编辑文件。例如JBPM中创建流程图过程。

 重点：

流程文件在编辑器中打开：

流程文件的保存：

package com.easyway.plugin.gef.diagram.dev.ui;

import java.io.InputStream;

import org.eclipse.core.resources.IFile;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.wizard.Wizard;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.ui.INewWizard;

import org.eclipse.ui.IWorkbench;

import org.eclipse.ui.IWorkbenchPage;

import org.eclipse.ui.IWorkbenchWindow;

import org.eclipse.ui.dialogs.WizardNewFileCreationPage;

import org.eclipse.ui.part.FileEditorInput;

 

import com.easyway.plugin.gef.diagram.dev.model.Diagram;

/**

 * 添加向导页

 * @author longgangbai

 *

 */

publicclass DiagramCreationWizard extends Wizard implements INewWizard {

 

   //向导页对象

   private WizardPage wizardPage;

   //选中对象

   private IStructuredSelection selection;

   //工作平台

   private IWorkbench workbench;

 

 

   //----------------------------------------------------------------

   // Abstract methods from IWorkbenchWizard

   @Override

   publicvoid init(IWorkbench workbench, IStructuredSelection currentSelection) {

      this.workbench = workbench;

      this.selection = currentSelection;

   }

 

   //-------------------------------------------------------------

   // Overridden from Wizard

   @Override

   publicvoid addPages() {

      // by default the superclass doesn't have any pages - here we add one

      this.wizardPage = new WizardPage(this.workbench, this.selection);

      addPage(this.wizardPage);

   }

 

 

  //-------------------------------------------------------------

  // Abstract methods from Wizard

  @Override

   publicboolean performFinish() {

      returnthis.wizardPage.finish();

   }

}

/**

 * 添加一个向导页面

 * （备注：此处给eclipse系统新建的基础上添加相关的向导继承WizardNewFileCreationPage）

 * @author longgangbai

 *

 */

class WizardPage extends WizardNewFileCreationPage {

 

   private IWorkbench workbench;

 

   public WizardPage(IWorkbench aWorkbench, IStructuredSelection selection) {

      super("自定义流程向导", selection);

      this.setTitle("创建自定义流程文件");

      this.setDescription("创建自定义流程文件");

      this.workbench = aWorkbench;

   }

   publicboolean finish() {

       //创建一个新文件中

      IFile newFile = createNewFile();

      if (newFile == null)

         returnfalse; // ie.- creation was unsuccessful

 

      // Since the file resource was created fine, open it for editing

      // iff requested by the user

      try {

         IWorkbenchWindow dwindow = workbench.getActiveWorkbenchWindow();

         IWorkbenchPage page = dwindow.getActivePage();

         if (page != null)

         {

             page.openEditor(new FileEditorInput(newFile),DiagramEditor.ID);

         }

      }

      catch (org.eclipse.ui.PartInitException e) {

         e.printStackTrace();

         returnfalse;

      }

      returntrue;

   }

   //---------------------------------------------------------------

   // Overridden from WizardNewFileCreationPage

   @Override

   publicvoid createControl(Composite parent) {

      super.createControl(parent);

      this.setFileName("model.river");

      setPageComplete(validatePage());

   }

   @Override

   protected InputStream getInitialContents() {

      // by default the superclass returns null for this

      Diagram diagram = new Diagram();

      InputStream istream = null;

      try {

         istream = diagram.getAsStream();

      }

      catch (Exception e) {

         e.printStackTrace();

      }

      return istream;

   }

}

关于编辑器向导的plugin.xml配置如下：

   <extensionpoint="org.eclipse.ui.newWizards">

      <categoryid="com.easyway.plugin.gef.diagram.dev"name="diagram"/>

      <wizardid="com.easyway.plugin.gef.diagram.dev.wizard.new.file"

            name="River Model"

            icon="icons/river.gif"

            category="com.easyway.plugin.gef.diagram.dev"            class="com.easyway.plugin.gef.diagram.dev.ui.DiagramCreationWizard">

          <description>Wizard for creating a new River model.</description>

         <selectionclass="org.eclipse.core.resources.IResource">

        </selection>

     </wizard>

  </extension>