Eclipse RCP：从表单值生成视图

Question

我想构建一个类似于下图的用户界面：

当用户填写右侧的表格并单击“绘图！”时按钮，一个新的可关闭标签会在左侧打开一个图表。

我是 RCP 的新手，一直在关注 this tutorial。我能够调出带有从菜单项触发的图表的选项卡。我该怎么做：

1. 使用表单创建选项卡（视图？）
2. 当用户单击按钮时打开一个新的图表选项卡

编辑

这是我当前的代码。它满足这个问题中概述的基本要求，但我不确定这是否是最好的方法。如果有人能指导我正确的方向，我会很高兴。

带有表单的视图；按钮的侦听器调用命令。

public class FormView extends ViewPart {
    public static final String ID = 
        FormView.class.getPackage().getName() + ".Form";

    private FormToolkit toolkit;
    private Form form;
    public Text text;

    @Override
    public void createPartControl(Composite parent) {
        toolkit = new FormToolkit(parent.getDisplay());
        form = toolkit.createForm(parent);
        form.setText("Pie Chucker");
        GridLayout layout = new GridLayout();
        form.getBody().setLayout(layout);
        layout.numColumns = 2;
        GridData gd = new GridData();
        gd.horizontalSpan = 2;
        Label label = new Label(form.getBody(), SWT.NULL);
        label.setText("Chart Title:");
        text = new Text(form.getBody(), SWT.BORDER);
        text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        Button button = new Button(form.getBody(), SWT.PUSH);
        button.setText("Plot");
        gd = new GridData();
        gd.horizontalSpan = 2;
        button.setLayoutData(gd);
        button.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseDown(MouseEvent e) {
                IHandlerService handlerService = (IHandlerService) getSite()
                    .getService(IHandlerService.class);
                try {
                    handlerService.executeCommand(ShowChartHandler.ID, null);
                } catch (Exception ex) {
                    throw new RuntimeException(ShowChartHandler.ID + 
                        " not found");
                }
            }
        });

    }

    @Override
    public void setFocus() {
    }
}

表单中的按钮调用的命令。这将打开一个带有图表的新视图。

public class ShowChartHandler extends AbstractHandler implements IHandler {
    public static final String ID = 
        ShowChartHandler.class.getPackage().getName() + ".ShowChart";
    private int count = 0;

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {
        IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindow(event);
        try {
            window.getActivePage().showView(ChartView.ID, 
                String.valueOf(++count), IWorkbenchPage.VIEW_ACTIVATE);
        } catch (PartInitException e) {
            e.printStackTrace();
        }
        return null;
    }
}

带有图表的视图。它查找表单视图并从表单中的文本字段中读取一个值 (?!)：

public class ChartView extends ViewPart {
    public static final String ID = 
        ChartView.class.getPackage().getName() + ".Chart";

    private static final Random random = new Random();

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

    @Override
    public void createPartControl(Composite parent) {
        FormView form = 
            (FormView) Workbench.getInstance()
                                .getActiveWorkbenchWindow()
                                .getActivePage()
                                .findView(FormView.ID);
        String title = form == null? null : form.text.getText();
        if (title == null || title.trim().length() == 0) {
            title = "Pie Chart";
        }
        setPartName(title);
        JFreeChart chart = createChart(createDataset(), title);
        new ChartComposite(parent, SWT.NONE, chart, true);
    }

    @Override
    public void setFocus() {
        // TODO Auto-generated method stub
    }

    /**
     * Creates the Dataset for the Pie chart
     */
    private PieDataset createDataset() {
        Double[] nums = getRandomNumbers();
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("One", nums[0]);
        dataset.setValue("Two", nums[1]);
        dataset.setValue("Three", nums[2]);
        dataset.setValue("Four", nums[3]);
        dataset.setValue("Five", nums[4]);
        dataset.setValue("Six", nums[5]);
        return dataset;
    }

    private Double[] getRandomNumbers() {
        Double[] nums = new Double[6];
        int sum = 0;
        for (int i = 0; i < 5; i++) {
            int r = random.nextInt(20);
            nums[i] = new Double(r);
            sum += r;
        }
        nums[5] = new Double(100 - sum);
        return nums;
    }

    /**
     * Creates the Chart based on a dataset
     */
    private JFreeChart createChart(PieDataset dataset, String title) {

        JFreeChart chart = ChartFactory.createPieChart(title, // chart title
                dataset, // data
                true, // include legend
                true, false);

        PiePlot plot = (PiePlot) chart.getPlot();
        plot.setSectionOutlinesVisible(false);
        plot.setLabelFont(new Font("SansSerif", Font.PLAIN, 12));
        plot.setNoDataMessage("No data available");
        plot.setCircular(false);
        plot.setLabelGap(0.02);
        return chart;

    }

}

将这一切联系在一起的观点：

public class Perspective implements IPerspectiveFactory {

    public void createInitialLayout(IPageLayout layout) {
        layout.setEditorAreaVisible(false);
        layout.addStandaloneView(FormView.ID, false, 
                IPageLayout.RIGHT, 0.3f, 
                IPageLayout.ID_EDITOR_AREA);
        IFolderLayout charts = layout.createFolder("Charts", 
                IPageLayout.LEFT, 0.7f, FormView.ID);
        charts.addPlaceholder(ChartView.ID + ":*");
    }
}

Answer 1

我会推荐一种不同的方法。 Eclipse 有viewparts（视图）和编辑器。打开多个编辑器很容易。打开多个视图并没有那么多视图。 所以我的建议是，您将调用“FormView”的部分实现为 StandAloneView，并将“ChartView”实现为编辑器。

我还建议为按钮使用不同的侦听器，这样在使用键盘单击按钮时也会执行代码。

我的建议：

public class FormView extends ViewPart { 
...
button.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
    // this below can also be called by a command but you need to take care about the data, which the user put into the fields in  different way.
    Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
    IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
    IWorkbenchPage page = window.getActivePage();

    ChartEditorInput input = new ChartEditorInput(text.getText(),...<other data you need to pass>);
    try {
     page.openEditor(input, ChartEditor.ID);
    } catch (PartInitException e) { 
       e.printStackTrace();
    }

}
});

ChartView 需要改为 ChartEditor。请参阅此处http://www.vogella.de/articles/RichClientPlatform/article.html#editor_editorinput这是如何完成的。
ChartEditorInput 是一个你需要在编辑器类旁边实现的类，它保存数据。

在您看来，您称：

public void createInitialLayout(IPageLayout layout) {
   String editorArea = layout.getEditorArea();
   layout.setFixed(false);
   layout.setEditorAreaVisible(true);

   layout.addStandaloneView("your.domain.and.FormView", true,IPageLayout.RIGHT, 0.15f, editorArea);

希望这会有所帮助！