GEF入门实例_总结_05_显示一个空白编辑器

package gef.tutorial.step.ui.editor;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.gef.palette.PaletteRoot;
import org.eclipse.gef.ui.parts.GraphicalEditorWithFlyoutPalette;

public class DiagramEditor extends GraphicalEditorWithFlyoutPalette {

    public DiagramEditor() {
        // TODO Auto-generated constructor stub
    }

    @Override
    protected PaletteRoot getPaletteRoot() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void doSave(IProgressMonitor monitor) {
        // TODO Auto-generated method stub

    }

}

package gef.tutorial.step.ui.editor;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.gef.DefaultEditDomain;
import org.eclipse.gef.palette.PaletteRoot;
import org.eclipse.gef.ui.parts.GraphicalEditorWithFlyoutPalette;

public class DiagramEditor extends GraphicalEditorWithFlyoutPalette {

    //1.添加ID,与扩展点ID保持一致，因此为了避免出错，建议ID统一为全类名
    public static final String ID = "gef.tutorial.step.ui.editor.DiagramEditor";
    

    public DiagramEditor() {
        //2.为该编辑器设置编辑域。默认是其本身
        setEditDomain(new DefaultEditDomain(this));
    }

    @Override
    protected PaletteRoot getPaletteRoot() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void doSave(IProgressMonitor monitor) {
        // TODO Auto-generated method stub

    }

}

package gef.tutorial.step.ui.editor.input;

import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.IPathEditorInput;
import org.eclipse.ui.IPersistableElement;

public class DiagramEditorInput implements IPathEditorInput {

    private IPath path;

    public DiagramEditorInput(IPath path) {
        this.path = path;
    }

    @Override
    public boolean exists() {
        // TODO Auto-generated method stub
        return path.toFile().exists();
    }

    @Override
    public ImageDescriptor getImageDescriptor() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String getName() {
        // TODO Auto-generated method stub
        return path.toString();
    }

    @Override
    public IPersistableElement getPersistable() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String getToolTipText() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public <T> T getAdapter(Class<T> adapter) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public IPath getPath() {
        // TODO Auto-generated method stub
        return path;
    }

    @Override
    public int hashCode(){
        // TODO Auto-generated method stub
        return path.hashCode();
    }

}

package gef.tutorial.step.action;


import org.eclipse.core.runtime.Path;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;

import gef.tutorial.step.app.Activator;
import gef.tutorial.step.constant.IImageConstant;
import gef.tutorial.step.ui.editor.DiagramEditor;
import gef.tutorial.step.ui.editor.input.DiagramEditorInput;

/**
 * DiagramAction
 * 
 * @author shirayner
 *
 */
public class DiagramAction extends Action {
    private final IWorkbenchWindow window;
    public final static String ID = "gef.tutorial.step.action.DiagramAction";

    /**
     * 一、在构造方法中设置基本属性
     * 
     * @param window
     */
    public DiagramAction(IWorkbenchWindow window) {
        this.window = window;

        //1.定义该Action的ID.  每一个Action需要一个唯一的ID号
        setId(ID);

        //2.设置该Action的文字。该文字也就是菜单上的文字。"@ALT+D"用来设置该Action的快捷键
        setText("&Diagram@ALT+D");

        //3.设置工具栏的提示文本
        setToolTipText("Draw the GEF diagram.");

        //4.设置该Action的图片。该方法使用 AbstractUIPlugin 抽象类的 imageDescriptorFromPlugin() 方法快捷地获取图像。
        //imageDescriptorFromPlugin()方法需要两个参数：项目ID、图片文件名。
        setImageDescriptor(Activator.imageDescriptorFromPlugin( Activator.PLUGIN_ID, IImageConstant.EDITORTITLE));

    }




    /**
     * 二、在Run方法中设置要执行的动作。
     * 单击菜单、工具栏图标按钮或者按键时会执行Action的run方法
     * 
     */
    @Override
    public void run() {
        //1.打开文本对话框后，获取文件路径
        String path = openFileDialog();
        if (path != null) {
            //弹出一个对话框
            //MessageDialog.openInformation(window.getShell(), "温馨提示", "文件保存路径为："+path);

            //2.根据文件路径，创建一个编辑器输入
            IEditorInput input = new DiagramEditorInput(new Path(path));

            //3.获取工作台页面
            IWorkbenchPage page = window.getActivePage();

            try{
                //4.根据扩展点ID打开编辑器.
                page.openEditor(input, DiagramEditor.ID,true);

            }catch(Exception e){
                System.err.println(e);
            }

        }

    }


    /** 打开一个文件对话框
     * 
     * @return
     *   String  文件路径
     */
    private String openFileDialog(){
        FileDialog dialog = new FileDialog(window.getShell(),SWT.OPEN);
        dialog.setText("文件保存到");
        dialog.setFilterExtensions(new String[] { ".diagram" });
        return dialog.open();
    }



}