如何使用IMemento 存储视图部分的所有信息？

Question

我有一个使用扩展 ViewPart 的视图的 eclipse 插件。 ViewPart 有一个需要 IMemento 的 saveState 方法。我将我的代码添加到 saveState 和相应的 init-Method 并且它有效。

我创建了 3 个 hashmap。

1) hmTextONLY: 它只包含文本值。(列名(ColumnIndex):Threarname(1),categoryname(2),description(5),justification(6 ))

2) hmCOMBO1ONLY: 它只包含 combobox1 值。(列名(列索引): status(3))

3) hmCOMBO2ONLY: 它只包含 combobox2 值。(列名(列索引):Priority(4))

这里是方法说明，代码中用到了

init: 初始化视图

createPartControl: 在视图部分创建table。

fillRows: table中的数据来自该方法。一行一行。 saveState：此方法用于保存 data.saveState 仅在整个工作区关闭时调用。

saveState:关闭应用程序时保存工作空间

问题： 1) 如何使用保存状态方法保存整个 table 数据顺序（文本混合，组合框）？我在 saveState 方法中创建了一个子表单 Id1。

代码：

public class Theartview extends ViewPart implements Serializable {

Table table;
private TableViewer tableViewer;
TableViewerColumn tableViewerColumn;
TableColumnLayout tableColumnLayout;
private HashMap<Integer, String> hmTextONLY = new HashMap<>();
private HashMap<Integer, String> hmCOMBO1ONLY = new HashMap<>();
private HashMap<Integer, String> hmCOMBO2ONLY = new HashMap<>();
private static Integer hmT = 0, hmC1 = 0, hmC2 = 0;
private IMemento memento;
private Text text_1, text_2, text_3, text_4;

public void createPartControl(Composite parent) {

    Composite tableComposite = new Composite(parent, SWT.NONE);
    tableColumnLayout = new TableColumnLayout();
    tableComposite.setLayout(tableColumnLayout);
    tableComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true,
            true));

    tableViewer = new TableViewer(tableComposite, SWT.MULTI | SWT.H_SCROLL
            | SWT.V_SCROLL);
    tableViewer.setContentProvider(ArrayContentProvider.getInstance());
    // TODO viewer.setLabelProvider(new ViewLabelProvider());
    table = tableViewer.getTable();
    table.setHeaderVisible(true);
    table.setLinesVisible(true);

    String[] titles = { "Threat Name", "Category Name", "Status",
            "Priority", "Description", "Justification" };

    for (int loopIndex = 0; loopIndex < titles.length; loopIndex++) {
        tableViewerColumn = new TableViewerColumn(tableViewer, SWT.NONE);
        TableColumn tblclmn = tableViewerColumn.getColumn();
        tableColumnLayout.setColumnData(tblclmn, new ColumnPixelData(200,
                true, true));
        tblclmn.setText(titles[loopIndex]);
    }

    if (memento != null) {
        System.out.println("Entering Restore State");
        restoreState(memento);
    }

    memento = null;

  }

   private void fillRows(String shortdesc, String categ, String descp) {
       TableItem ramtableitem = new TableItem(table, SWT.NONE);

       // for Threat_Name
       TableEditor editorTN = new TableEditor(table);
       text_1 = new Text(table, SWT.NONE);
       editorTN.grabHorizontal = true;
       editorTN.setEditor(text_1, ramtableitem, 0);
       text_1.setText(shortdesc);
       Theart_Name = text_1.getText();
       hmTextONLY.put(hmT++, Theart_Name);

       // For Category_Name
        TableEditor editorCN = new TableEditor(table);
        text_2 = new Text(table, SWT.NONE);
        editorCN.grabHorizontal = true;
        editorCN.setEditor(text_2, ramtableitem, 1);
        text_2.setText(categ);
        Category_Name = text_2.getText();
        hmTextONLY.put(hmT++, Category_Name);

         String items[] = { "Mitigated", "Not Applicable", "Not Started",
            "Needs Investigation" };
        Arrays.sort(items);

        final CCombo Status_Combo = new CCombo(table, SWT.NONE);
        Status_Combo.setItems(items);
        TableEditor editor = new TableEditor(table);
        editor.grabHorizontal = true;
        editor.setEditor(Status_Combo, ramtableitem, 2);

        Status_Combo.addSelectionListener(new SelectionListener() {
          public void widgetSelected(SelectionEvent e) {
             Status_Name = Status_Combo.getText();
            hmCOMBO1ONLY.put(hmC1, Status_Name);
         }

        public void widgetDefaultSelected(SelectionEvent e) {               
            Status_Name = Status_Combo.getText();               
            hmCOMBO1ONLY.put(hmC1, Status_Name);
            }
        });


       // For Priority_Name
    String itemss[] = { "High", "Medium", "Low" };
    Arrays.sort(itemss);
    final CCombo Priority_Combo = new CCombo(table, SWT.NONE);
    Priority_Combo.setItems(itemss);
    TableEditor editorP = new TableEditor(table);
    editorP.grabHorizontal = true;
    editorP.setEditor(Priority_Combo, ramtableitem, 3);

    Priority_Combo.addSelectionListener(new SelectionListener() {
        public void widgetSelected(SelectionEvent e) {
            System.out.println(Priority_Combo.getText());
            Priority_Name = Priority_Combo.getText();
            hmCOMBO2ONLY.put(hmC2, Priority_Name);
        }

        public void widgetDefaultSelected(SelectionEvent e) {
            System.out.println(Priority_Combo.getText());
            Priority_Name = Priority_Combo.getText();
            hmCOMBO2ONLY.put(hmC2, Priority_Name);
        }
    });
      // For Descrption_Name
        TableEditor editorDN = new TableEditor(table);
        text_3 = new Text(table, SWT.NONE);
        editorDN.grabHorizontal = true;
        editorDN.setEditor(text_3, ramtableitem, 4);
        text_3.setText(descp);
        Descrption_Name = text_3.getText();
        hmTextONLY.put(hmT++, Descrption_Name);

        // For justification
        TableEditor editorJ = new TableEditor(table);
        text_4 = new Text(table, SWT.MULTI | SWT.BORDER | SWT.WRAP
            | SWT.V_SCROLL);
         editorJ.grabHorizontal = true;
        editorJ.setEditor(text_4, ramtableitem, 5);
        Justification_Name = text_4.getText().toString().trim();
        hmTextONLY.put(hmT++, Justification_Name);
   }

public void saveState(IMemento memento) {
     super.saveState(memento);
    for (int s = 0; s <= hmTextONLY.size(); s++) {
    for (int su = 0; su <= hmCOMBO1ONLY.size(); su++) {
     for (int sum = 0; sum <= hmCOMBO2ONLY.size(); sum++) {
                IMemento mem = memento.createChild(ID1 + "s");
                mem.putString(ID1 + "s", hmTextONLY.get(s));
             }
        }
     }


public void init(IViewSite site, IMemento memento) throws PartInitException{
     super.init(site, memento);
    this.memento = memento;
    System.out.println("Intialize the view");

 }


 }

}

以上代码的当前输出：

Answer 1

IMemento 能够保持任意状态，只要它可以序列化为字符串和基元。您需要编写将视图状态（例如列宽、选择等）与给定 IMemento 实例相互转换的代码。

为了结构化存储的数据，mementos也可以嵌套。使用 createChild()，创建子备忘录。

视图具有生命周期方法，即 init() 和 saveState()，它们在

时调用

视图已初始化，备忘录中的状态应应用于视图
视图即将关闭，其状态应存储在备忘录中。

此 wiki 页面提供了更多详细信息，还列出了使用纪念品的替代方法：https://wiki.eclipse.org/FAQ_How_does_a_view_persist_its_state_between_sessions%3F

如何使用IMemento 存储视图部分的所有信息？

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