>我正在阅读巴里凯利(Barry Kelly)看起来像conference talk的薄片,并在第二页上找到. 13看起来很有趣的东西：TRTTIConstructor.Invoke.在相邻的项目符号点中,可以找到“动态构造实例而无需虚拟构造函数和元类”.这似乎是一个很棒的功能(正是我需要的,顺便说一下)！但是,当我查看D2010文档(ms-help：//embarcadero.rs2010/vcl/Rtti.html)时,我找不到它.它被撤销了吗？
>如果类名存储在字符串中,创建类实例的最小方法是什么？

至于问题2,尝试这样的事情：

function GetConstructor(val: TRttiInstanceType): TRttiMethod;
var
   method: TRttiMethod;
begin
   for method in val.getmethods('Create') do
   begin
      if (method.IsConstructor) and (length(method.GetParameters) = 0) then
         exit(method);
   end;
   raise EInsufficientRTTI.CreateFmt('No simple constructor available for class %s ',[val.Metaclasstype.ClassName]);
end;

这将找到名为Create的最高构造函数,该构造函数不带参数.如果您知道要查找的内容,可以对其进行修改以查找具有其他签名的其他构造函数.然后只需在结果上调用Invoke.

program Project1;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.SysUtils,System.Generics.Collections,System.Generics.Defaults;

type
  TDBStats = record
    Comb: Integer;
    Freq: Integer;
  end;
  TDBStatsList = TList<TDBStats>;

procedure Add(ODBStats: TDBStatsList; const Item: TDBStats);
var
  rItem: TDBStats;
begin
  rItem := Item;
  rItem.Freq := 1;
  oDBStats.Add(rItem);
end;

procedure Update(ODBStats: TDBStatsList; const Item: TDBStats; const Index: Integer);
var
  rItem: TDBStats;
begin
  rItem := Item;
  Inc(rItem.Freq);
  oDBStats[Index] := rItem;
end;


var
  oDBStats: TDBStatsList;
  rDBStats: TDBStats;
  myArr: array [0..4] of integer;
  iIndex1: Integer;
begin
  try
    myArr[0] := 10;
    myArr[1] := 20;
    myArr[2] := 30;
    myArr[3] := 40;
    myArr[4] := 10;

    oDBStats := TList<TDBStats>.Create;
    try
      for iIndex1 := 0 to 4 do
      begin
        rDBStats.Comb := myArr[iIndex1];
        if oDBStats.Contains(rDBStats) then
          Update(oDBStats,rDBStats,oDBStats.IndexOf(rDBStats))
        else
          Add(oDBStats,rDBStats);
      end;
      // Check List
      for iIndex1 := 0 to Pred(oDBStats.Count) do
        Writeln(oDBStats[iIndex1].Comb:3,oDBStats[iIndex1].Freq:10);
    finally
      oDBStats.Free;
    end;

  except
    on E: Exception do
      Writeln(E.ClassName,': ',E.Message);
  end;
  Readln;
end.

并应该返回此结果：

10     2
20     1
30     1
40     1
50     1

但是返回这个结果：

10     1
20     1
30     1
40     1
50     1
10     1

我已经理解了问题：当我使用oDBStats.Contains(rDBStats)时,它控制rDBStats元素是否包含在列表中;第一次没找到它并添加到列表中;但是当它被添加到列表中时我将freq字段更新为1;所以第二次当我再次检查rdbstats时,freq = 0没找到它.
我可以解决这个问题吗？我需要一个计数器,我从输入中得到一个“梳子”,我想检查这个“梳子”是否存在于列表中,独立于记录的另一个字段的值.如果我在列表中找到“梳子”,那么我更新,增加频率字段.
感谢帮助.

要使您的示例正常工作,您必须指定一个自定义比较器,仅比较记录的梳形字段.这是一个例子：

oDBStats := TList<TDBStats>.Create(TDelegatedComparer<TDBStats>.Create(
 function(const Left,Right: TDBStats): Integer
 begin
   result := CompareValue(Left.comb,Right.comb);
 end));

此外,您的更新例程中有错误.您正在递增item参数的未定义值,而不是递增现有值.第一行的更改应该使它工作：

rItem := oDBStats[Index];
  Inc(rItem.Freq);
  oDBStats[Index] := rItem;

最好的祝福,

加布里埃尔

如果要删除该项,请使用以下命令：

treeView1.Items.Remove(treeView1.SelectedItem);

如果要从树视图中删除选择,请使用以下命令：

((TreeViewItem)treeView1.SelectedItem).IsSelected = false;

private static JPanel createCommentsPanel(final TreeTableView treeTable) {
  JPanel panel = new JPanel(new BorderLayout());
  final JTextArea textArea = createTextArea();
  treeTable.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
    @Override
    public void valueChanged(@NotNull ListSelectionEvent e) {
      final int index = treeTable.getSelectionModel().getMinSelectionIndex();
      if (index == -1) {
        textArea.setText("");
      } else {
        final VcsFileRevision revision = getRevisionAt(treeTable,index);
        if (revision != null) {
          textArea.setText(revision.getCommitMessage());
        } else {
          textArea.setText("");
        }
      }
    }
  });
  final JScrollPane textScrollPane = ScrollPaneFactory.createScrollPane(textArea);
  panel.add(textScrollPane,BorderLayout.CENTER);
  textScrollPane.setBorder(IdeBorderFactory.createTitledBorder(VcsBundle.message("border.selected.revision.commit.message"),false
  ));
  return panel;
}

@Override
@Nullable
public Object getTagAt(@NotNull final MouseEvent e) {
  // Todo[yole]: don't update renderer on every event,like it's done in TreeLinkMouseListener
  Object tag;
  JTable table = (JTable)e.getSource();
  int row = table.rowAtPoint(e.getPoint());
  int column = table.columnAtPoint(e.getPoint());
  if (row == -1 || column == -1) return null;
  TableCellRenderer cellRenderer = table.getCellRenderer(row,column);
  if (cellRenderer instanceof DualView.TableCellRendererWrapper) {
    cellRenderer = ((DualView.TableCellRendererWrapper) cellRenderer).getRenderer();
  }
  if (cellRenderer instanceof TreeTableView.CellRendererWrapper) {
    cellRenderer = ((TreeTableView.CellRendererWrapper) cellRenderer).getBaseRenderer();
  }
  if (cellRenderer instanceof ColoredTableCellRenderer) {
    final ColoredTableCellRenderer renderer = (ColoredTableCellRenderer)cellRenderer;
    tag = forColoredRenderer(e,table,row,column,renderer);
  } else {
    tag = tryGetTag(e,column);
  }
  return tag;
}

private void createuicomponents() {
  UpdaterTreeNode.Renderer renderer = new SummaryTreeNode.Renderer();

  myPlatformloadingIcon = new AsyncProcessIcon("Loading...");
  myPlatformSummaryRootNode = new RootNode();
  myPlatformDetailsRootNode = new RootNode();
  ColumnInfo[] platformSummaryColumns =
    new ColumnInfo[]{new DownloadStatusColumnInfo(),new TreeColumnInfo("Name"),new ApiLevelColumnInfo(),new RevisionColumnInfo(),new StatusColumnInfo()};
  myPlatformSummaryTable = new TreeTableView(new ListTreeTableModelOnColumns(myPlatformSummaryRootNode,platformSummaryColumns));
  SdkUpdaterConfigPanel.setTreeTableProperties(myPlatformSummaryTable,renderer);
  MouseListener modificationListener = new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent e) {
      refreshModified();
    }
  };
  myPlatformSummaryTable.addMouseListener(modificationListener);

  ColumnInfo[] platformDetailColumns =
    new ColumnInfo[]{new DownloadStatusColumnInfo(),new StatusColumnInfo()};
  myPlatformDetailTable = new TreeTableView(new ListTreeTableModelOnColumns(myPlatformDetailsRootNode,platformDetailColumns));
  SdkUpdaterConfigPanel.setTreeTableProperties(myPlatformDetailTable,renderer);
  myPlatformDetailTable.addMouseListener(modificationListener);
}

/**
 * This instance is created by Swing.
 * Do not call this constructor manually.
 */
public LanguagesPanel() {
    super(new BorderLayout());
    SpoofaxIdeaPlugin.injector().injectMembers(this);

    final LanguageTreeModel model = new LanguageTreeModel(this.iconManager);
    this.languagesTree = new TreeTableView(model);
    this.languagesTree.setTreeCellRenderer(new LanguageTreeModel.LanguageTreeCellRenderer());
    this.languagesTree.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

    final ToolbarDecorator toolbarDecorator = ToolbarDecorator.createDecorator(this.languagesTree)
            .setAddAction(this::addLanguage)
            .setAddActionUpdater(e -> this.controller != null)
            .setRemoveAction(button -> removeLanguage(getSelectednode()))
            .setRemoveActionUpdater(e -> this.controller != null && getSelectednode() != null)
            .disableupdownActions();

    add(toolbarDecorator.createPanel(),BorderLayout.CENTER);
    setBorder(IdeBorderFactory.createTitledBorder("Loaded languages",false));
}

private static JPanel createCommentsPanel(final TreeTableView treeTable) {
  JPanel panel = new JPanel(new BorderLayout());
  final JTextArea textArea = createTextArea();
  treeTable.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
    public void valueChanged(ListSelectionEvent e) {
      final int index = treeTable.getSelectionModel().getMinSelectionIndex();
      if (index == -1) {
        textArea.setText("");
      } else {
        final VcsFileRevision revision = getRevisionAt(treeTable,false
  ));
  return panel;
}

@Nullable
protected Object getTagAt(final MouseEvent e) {
  // Todo[yole]: don't update renderer on every event,like it's done in TreeLinkMouseListener
  Object tag = null;
  JTable table = (JTable)e.getSource();
  int row = table.rowAtPoint(e.getPoint());
  int column = table.columnAtPoint(e.getPoint());
  if (row == -1 || column == -1) return null;
  TableCellRenderer cellRenderer = table.getCellRenderer(row,column);
  }
  return tag;
}

private static JPanel createCommentsPanel(final TreeTableView treeTable) {
  JPanel panel = new JPanel(new BorderLayout());
  final JTextArea textArea = createTextArea();
  treeTable.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
    public void valueChanged(ListSelectionEvent e) {
      final int index = treeTable.getSelectionModel().getMinSelectionIndex();
      if (index == -1) {
        textArea.setText("");
      } else {
        final VcsFileRevision revision = getRevisionAt(treeTable,false
  ));
  return panel;
}

@Nullable
public Object getTagAt(final MouseEvent e) {
  // Todo[yole]: don't update renderer on every event,column);
  }
  return tag;
}

private static void showTreePopup(final List<TreeItem<VcsFileRevision>> roots,final VirtualFile file,final Project project,final DiffProvider diffProvider) {
  final TreeTableView treeTable = new TreeTableView(new ListTreeTableModelOnColumns(new TreeNodeAdapter(null,null,roots),new ColumnInfo[]{BRANCH_COLUMN,REVISION_COLUMN,DATE_COLUMN,AUTHOR_COLUMN}));
  Runnable runnable = new Runnable() {
    @Override
    public void run() {
      int index = treeTable.getSelectionModel().getMinSelectionIndex();
      if (index == -1) {
        return;
      }
      VcsFileRevision revision = getRevisionAt(treeTable,index);
      if (revision != null) {
        DiffActionExecutor.showDiff(diffProvider,revision.getRevisionNumber(),file,project,VcsBackgroundableActions.COMPARE_WITH);
      }
    }
  };

  treeTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

  new PopupChooserBuilder(treeTable).
    setTitle(VcsBundle.message("lookup.title.vcs.file.revisions")).
    setItemChoosenCallback(runnable).
    setSouthComponent(createCommentsPanel(treeTable)).
    setResizable(true).
    setDimensionServiceKey("Vcs.CompareWithSelectedRevision.Popup").
    createPopup().
    showCenteredInCurrentwindow(project);

  final int lastRow = treeTable.getRowCount() - 1;
  if (lastRow < 0) return;
  treeTable.getSelectionModel().addSelectionInterval(lastRow,lastRow);
  treeTable.scrollRectToVisible(treeTable.getCellRect(lastRow,true));
}

@Nullable private static VcsFileRevision getRevisionAt(final TreeTableView treeTable,final int index) {
  final List items = treeTable.getItems();
  if (items.size() <= index) {
    return null;
  } else {
    return ((TreeNodeAdapter)items.get(index)).getRevision();
  }

}

private void createuicomponents() {
  myToolsLoadingIcon = new AsyncProcessIcon("Loading...");

  myToolsSummaryRootNode = new RootNode();
  myToolsDetailsRootNode = new RootNode();

  UpdaterTreeNode.Renderer renderer = new SummaryTreeNode.Renderer();

  ColumnInfo[] toolsSummaryColumns =
    new ColumnInfo[]{new DownloadStatusColumnInfo(),new VersionColumnInfo(),new StatusColumnInfo()};
  myToolsSummaryTable = new TreeTableView(new ListTreeTableModelOnColumns(myToolsSummaryRootNode,toolsSummaryColumns));

  SdkUpdaterConfigPanel.setTreeTableProperties(myToolsSummaryTable,renderer);

  ColumnInfo[] toolsDetailColumns =
    new ColumnInfo[]{new DownloadStatusColumnInfo(),new StatusColumnInfo()};
  myToolsDetailTable = new TreeTableView(new ListTreeTableModelOnColumns(myToolsDetailsRootNode,toolsDetailColumns));
  SdkUpdaterConfigPanel.setTreeTableProperties(myToolsDetailTable,renderer);

  MouseListener modificationListener = new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent e) {
      refreshModified();
    }
  };
  myToolsDetailTable.addMouseListener(modificationListener);
  myToolsSummaryTable.addMouseListener(modificationListener);
}

private void createuicomponents() {
  myWorkItemsTableModel = new WorkItemsTableModel(new WorkItemsCheckinParameters());
  myWorkItemsTable = new TreeTableView(myWorkItemsTableModel) {
    @Override
    protected void onTableChanged(@NotNull TableModelEvent e) {
      super.onTableChanged(e);

      getTree().setRowHeight(calculateRowHeight());
    }
  };
}

private static void showTreePopup(final List<TreeItem<VcsFileRevision>> roots,AUTHOR_COLUMN}));
  Runnable runnable = new Runnable() {
    public void run() {
      int index = treeTable.getSelectionModel().getMinSelectionIndex();
      if (index == -1) {
        return;
      }
      VcsFileRevision revision = getRevisionAt(treeTable,VcsBackgroundableActions.COMPARE_WITH);
      }
    }
  };

  treeTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

  new PopupChooserBuilder(treeTable).
    setTitle(VcsBundle.message("lookup.title.vcs.file.revisions")).
    setItemChoosenCallback(runnable).
    setSouthComponent(createCommentsPanel(treeTable)).
    setResizable(true).
    setDimensionServiceKey("Vcs.CompareWithSelectedRevision.Popup").
    createPopup().
    showCenteredInCurrentwindow(project);
}

@Nullable private static VcsFileRevision getRevisionAt(final TreeTableView treeTable,final int index) {
  final List items = treeTable.getItems();
  if (items.size() <= index) {
    return null;
  } else {
    return ((TreeNodeAdapter)items.get(index)).getRevision();
  }

}

private static void showTreePopup(final List<TreeItem<VcsFileRevision>> roots,VcsBackgroundableActions.COMPARE_WITH);
      }
    }
  };

  treeTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

  new PopupChooserBuilder(treeTable).
    setTitle(VcsBundle.message("lookup.title.vcs.file.revisions")).
    setItemChoosenCallback(runnable).
    setSouthComponent(createCommentsPanel(treeTable)).
    setResizable(true).
    setDimensionServiceKey("Vcs.CompareWithSelectedRevision.Popup").
    createPopup().
    showCenteredInCurrentwindow(project);
}

@Nullable private static VcsFileRevision getRevisionAt(final TreeTableView treeTable,final int index) {
  final List items = treeTable.getItems();
  if (items.size() <= index) {
    return null;
  } else {
    return ((TreeNodeAdapter)items.get(index)).getRevision();
  }

}

CheckBoxClickListener(TreeTableView mainComponent,final UpdaterTreeNode.Renderer renderer) {
  myTreeTable = mainComponent;
  myRenderer = renderer;
}

private void createTree() {
  DefaultMutableTreeNode root = new DefaultMutableTreeNode();

  for (AddedFileInfo myRoot : myRoots) {
    root.add(myRoot);
  }

  myModel = new ListTreeTableModelOnColumns(root,COLUMNS);
  myTreeTable = new TreeTableView(myModel);

  int comboHeight = new JComboBox().getPreferredSize().height;
  int checkBoxHeight = new JCheckBox().getPreferredSize().height;
  myTreeTable.setMinRowHeight(Math.max(comboHeight,checkBoxHeight) + 2);
  myTreeTable.setRootVisible(false);
  final jtableheader tableHeader = myTreeTable.getTableHeader();
  tableHeader.setReorderingallowed(false);
  tableHeader.setResizingallowed(false);
  final TreeTableTree tree = myTreeTable.getTree();
  myTreeTable.addKeyListener(new KeyAdapter() {
    @Override
    public void keypressed(KeyEvent e) {
      final int keyCode = e.getKeyCode();
      if (keyCode == KeyEvent.VK_SPACE) {
        final int selectedColumn = myTreeTable.getSelectedColumn();
        if (selectedColumn == 0) {
          return;
        }
        final int[] selectedRows = myTreeTable.getSelectedRows();
        if (selectedRows.length == 0) {
          return;
        }
        final boolean included = !((AddedFileInfo)myTreeTable.getValueAt(selectedRows[0],1)).included();
        for (int selectedRow : selectedRows) {
          final AddedFileInfo addedFileInfo = (AddedFileInfo)myTreeTable.getValueAt(selectedRow,1);
          addedFileInfo.setIncluded(included);
          myModel.nodeChanged(addedFileInfo);
        }
      }
    }
  });
  tree.setCellRenderer(new AddedFileCellRenderer());
  TreeUtil.installActions(tree);
}

private void createTree() {
  DefaultMutableTreeNode root = new DefaultMutableTreeNode();

  for (AddedFileInfo myRoot : myRoots) {
    root.add(myRoot);
  }

  myModel = new ListTreeTableModelOnColumns(root,1);
          addedFileInfo.setIncluded(included);
          myModel.nodeChanged(addedFileInfo);
        }
      }
    }
  });
  tree.setCellRenderer(new AddedFileCellRenderer());
  TreeUtil.installActions(tree);
}

public DomElementsToggleAction(final DomModelTreeView treeView,final Class aClass) {
  myTreeView = treeView;
  myClass = aClass;

  Icon myIcon = ElementPresentationManager.getIcon(myClass);
  if (myIcon == null) {
    myIcon = AllIcons.Nodes.pointcut;
  }
  this.myIcon = myIcon;

  myText = TypePresentationService.getService().getTypePresentableName(myClass);

  if(getHiders() == null) DomUtil.getFile(myTreeView.getRootElement()).putUserData(AbstractDomElementNode.TREE_NODES_HIDERS_KEY,new HashMap<Class,Boolean>());

  if(getHiders().get(myClass) == null) getHiders().put(myClass,true);
}

@Override
@NotNull
protected DomCollectionChildDescription[] getDomCollectionChildDescriptions(final AnActionEvent e) {
  final DomModelTreeView view = getTreeView(e);

  SimpleNode node = view.getTree().getSelectednode();
  if (node instanceof BaseDomElementNode) {
    List<DomCollectionChildDescription> consolidated = ((BaseDomElementNode)node).getConsolidatedChildrenDescriptions();
    if (consolidated.size() > 0) {
      return consolidated.toArray(new DomCollectionChildDescription[consolidated.size()]);
    }
  }

  final DomElementsGroupNode groupNode = getDomElementsGroupNode(view);

  return groupNode == null
         ? DomCollectionChildDescription.EMPTY_ARRAY
         : new DomCollectionChildDescription[]{groupNode.getChildDescription()};
}

@Override
public void actionPerformed(AnActionEvent e,DomModelTreeView treeView) {
  final SimpleNode selectednode = treeView.getTree().getSelectednode();

  if (selectednode instanceof BaseDomElementNode) {

    if (selectednode instanceof DomFileElementNode) {
      e.getPresentation().setVisible(false);
      return;
    }

    final DomElement domElement = ((BaseDomElementNode)selectednode).getDomElement();

    final int ret = Messages.showOkCancelDialog(getPresentationText(selectednode,"Remove") + "?","Remove",Messages.getQuestionIcon());
    if (ret == Messages.OK) {
    new WriteCommandAction(domElement.getManager().getProject(),DomUtil.getFile(domElement)) {
      @Override
      protected void run(@NotNull final Result result) throws Throwable {
        domElement.undefine();
      }
    }.execute();
    }
  }
}

public DomElementsToggleAction(final DomModelTreeView treeView,final Class aClass) {
  myTreeView = treeView;
  myClass = aClass;

  Icon myIcon = ElementPresentationManager.getIcon(myClass);
  if (myIcon == null) {
    myIcon = AllIcons.Nodes.pointcut;
  }
  this.myIcon = myIcon;

  myText = TypePresentationService.getService().getTypePresentableName(myClass);

  if(getHiders() == null) DomUtil.getFile(myTreeView.getRootElement()).putUserData(BaseDomElementNode.TREE_NODES_HIDERS_KEY,true);
}

@NotNull
protected DomCollectionChildDescription[] getDomCollectionChildDescriptions(final AnActionEvent e) {
  final DomModelTreeView view = getTreeView(e);

  SimpleNode node = view.getTree().getSelectednode();
  if (node instanceof BaseDomElementNode) {
    List<DomCollectionChildDescription> consolidated = ((BaseDomElementNode)node).getConsolidatedChildrenDescriptions();
    if (consolidated.size() > 0) {
      return consolidated.toArray(new DomCollectionChildDescription[consolidated.size()]);
    }
  }

  final DomElementsGroupNode groupNode = getDomElementsGroupNode(view);

  return groupNode == null
         ? DomCollectionChildDescription.EMPTY_ARRAY
         : new DomCollectionChildDescription[]{groupNode.getChildDescription()};
}

public void actionPerformed(AnActionEvent e,DomModelTreeView treeView) {
  final SimpleNode selectednode = treeView.getTree().getSelectednode();

  if (selectednode instanceof BaseDomElementNode) {

    if (selectednode instanceof DomFileElementNode) {
      e.getPresentation().setVisible(false);
      return;
    }

    final DomElement domElement = ((BaseDomElementNode)selectednode).getDomElement();

    final int ret = Messages.showOkCancelDialog(getPresentationText(selectednode) + "?",ApplicationBundle.message("action.remove"),Messages.getQuestionIcon());
    if (ret == 0) {
    new WriteCommandAction(domElement.getManager().getProject(),DomUtil.getFile(domElement)) {
      protected void run(final Result result) throws Throwable {
        domElement.undefine();
      }
    }.execute();
    }
  }
}

public DomElementsToggleAction(final DomModelTreeView treeView,final Class aClass) {
  myTreeView = treeView;
  myClass = aClass;

  Icon myIcon = ElementPresentationManager.getIcon(myClass);
  if (myIcon == null) {
    myIcon = AllIcons.Nodes.pointcut;
  }
  this.myIcon = myIcon;

  myText = TypePresentationService.getInstance().getTypePresentableName(myClass);

  if(getHiders() == null) DomUtil.getFile(myTreeView.getRootElement()).putUserData(BaseDomElementNode.TREE_NODES_HIDERS_KEY,true);
}

@NotNull
protected DomCollectionChildDescription[] getDomCollectionChildDescriptions(final AnActionEvent e) {
  final DomModelTreeView view = getTreeView(e);

  SimpleNode node = view.getTree().getSelectednode();
  if (node instanceof BaseDomElementNode) {
    List<DomCollectionChildDescription> consolidated = ((BaseDomElementNode)node).getConsolidatedChildrenDescriptions();
    if (consolidated.size() > 0) {
      return consolidated.toArray(new DomCollectionChildDescription[consolidated.size()]);
    }
  }

  final DomElementsGroupNode groupNode = getDomElementsGroupNode(view);

  return groupNode == null
         ? DomCollectionChildDescription.EMPTY_ARRAY
         : new DomCollectionChildDescription[]{groupNode.getChildDescription()};
}

public void actionPerformed(AnActionEvent e,DomUtil.getFile(domElement)) {
      protected void run(final Result result) throws Throwable {
        domElement.undefine();
      }
    }.execute();
    }
  }
}

@Override
protected boolean isEnabled(final AnActionEvent e) {
  final DomModelTreeView treeView = getTreeView(e);

  final boolean enabled = treeView != null;
  e.getPresentation().setEnabled(enabled);

  return enabled;
}

@Override
protected void showPopup(final ListPopup groupPopup,final AnActionEvent e) {
  if (myTreeView == null) {
    if (e.getPlace().equals(DomModelTreeView.DOM_MODEL_TREE_VIEW_POPUP)) {
      groupPopup.showInCenterOf(getTreeView(e).getTree());
    }
    else {
      groupPopup.showInBestPositionFor(e.getDataContext());
    }
  }
  else {
    super.showPopup(groupPopup,e);
  }
}

@Override
protected DomElement getParentDomElement(final AnActionEvent e) {
  final DomModelTreeView view = getTreeView(e);
  SimpleNode node = view.getTree().getSelectednode();
  if (node instanceof BaseDomElementNode) {
    if (((BaseDomElementNode)node).getConsolidatedChildrenDescriptions().size() > 0) {
      return ((BaseDomElementNode)node).getDomElement();
    }
  }
  final DomElementsGroupNode groupNode = getDomElementsGroupNode(view);

  return groupNode == null ? null : groupNode.getDomElement();
}

@Nullable
private static DomElementsGroupNode getDomElementsGroupNode(final DomModelTreeView treeView) {
  SimpleNode simpleNode = treeView.getTree().getSelectednode();
  while (simpleNode != null) {
    if (simpleNode instanceof DomElementsGroupNode) return (DomElementsGroupNode)simpleNode;

    simpleNode = simpleNode.getParent();
  }
  return null;
}

@Override
public void actionPerformed(AnActionEvent e,DomModelTreeView treeView) {
  final SimpleNode simpleNode = treeView.getTree().getSelectednode();

  if(simpleNode instanceof BaseDomElementNode) {
    final DomElement domElement = ((BaseDomElementNode)simpleNode).getDomElement();
    final DomElementNavigationProvider provider =
      DomElementsNavigationManager.getManager(domElement.getManager().getProject()).getDomElementsNavigateProvider(DomElementsNavigationManager.DEFAULT_PROVIDER_NAME);

    provider.navigate(domElement,true);

  }
}

@Override
final public void update(AnActionEvent e) {
  final DomModelTreeView treeView = getTreeView(e);

  if (treeView != null) {
    update(e,treeView);
  }
  else {
    e.getPresentation().setEnabled(false);
  }
}

@Override
final public void actionPerformed(AnActionEvent e) {
  final DomModelTreeView treeView = getTreeView(e);
  if (treeView != null) {
    actionPerformed(e,treeView);
  }
}

@Override
public void update(AnActionEvent e,DomModelTreeView treeView) {
  final SimpleNode selectednode = treeView.getTree().getSelectednode();

  if (selectednode instanceof DomFileElementNode) {
    e.getPresentation().setVisible(false);
    return;
  }

  boolean enabled = false;
  if (selectednode instanceof BaseDomElementNode) {
    final DomElement domElement = ((BaseDomElementNode)selectednode).getDomElement();
    if (domElement.isValid() && DomUtil.hasXml(domElement) && !(domElement.getParent() instanceof DomFileElement)) {
      enabled = true;
    }
  }

  e.getPresentation().setEnabled(enabled);


  if (enabled) {
    e.getPresentation().setText(getPresentationText(selectednode,ApplicationBundle.message("action.remove")));
  }
  else {
    e.getPresentation().setText(ApplicationBundle.message("action.remove"));
  }

  e.getPresentation().setIcon(AllIcons.General.Remove);
}

protected boolean isEnabled(final AnActionEvent e) {
  final DomModelTreeView treeView = getTreeView(e);

  final boolean enabled = treeView != null;
  e.getPresentation().setEnabled(enabled);

  return enabled;
}

protected void showPopup(final ListPopup groupPopup,e);
  }
}

protected DomElement getParentDomElement(final AnActionEvent e) {
  final DomModelTreeView view = getTreeView(e);
  SimpleNode node = view.getTree().getSelectednode();
  if (node instanceof BaseDomElementNode) {
    if (((BaseDomElementNode)node).getConsolidatedChildrenDescriptions().size() > 0) {
      return ((BaseDomElementNode)node).getDomElement();
    }
  }
  final DomElementsGroupNode groupNode = getDomElementsGroupNode(view);

  return groupNode == null ? null : groupNode.getDomElement();
}

@Nullable
private static DomElementsGroupNode getDomElementsGroupNode(final DomModelTreeView treeView) {
  SimpleNode simpleNode = treeView.getTree().getSelectednode();
  while (simpleNode != null) {
    if (simpleNode instanceof DomElementsGroupNode) return (DomElementsGroupNode)simpleNode;

    simpleNode = simpleNode.getParent();
  }
  return null;
}

public void actionPerformed(AnActionEvent e,true);

  }
}

final public void update(AnActionEvent e) {
  final DomModelTreeView treeView = getTreeView(e);

  if (treeView != null) {
    update(e,treeView);
  }
  else {
    e.getPresentation().setEnabled(false);
  }
}

public void update(AnActionEvent e,DomModelTreeView treeView) {
  final SimpleNode selectednode = treeView.getTree().getSelectednode();

  if (selectednode instanceof DomFileElementNode) {
    e.getPresentation().setVisible(false);
    return;
  }

  boolean enabled = false;
  if (selectednode instanceof BaseDomElementNode) {
    final DomElement domElement = ((BaseDomElementNode)selectednode).getDomElement();
    if (domElement.isValid() && DomUtil.hasXml(domElement) && !(domElement.getParent() instanceof DomFileElement)) {
      enabled = true;
    }
  }

  e.getPresentation().setEnabled(enabled);


  if (enabled) {
    e.getPresentation().setText(getPresentationText(selectednode));
  }
  else {
    e.getPresentation().setText(ApplicationBundle.message("action.remove"));
  }

  e.getPresentation().setIcon(AllIcons.General.Remove);
}

protected boolean isEnabled(final AnActionEvent e) {
  final DomModelTreeView treeView = getTreeView(e);

  final boolean enabled = treeView != null;
  e.getPresentation().setEnabled(enabled);

  return enabled;
}

protected void showPopup(final ListPopup groupPopup,e);
  }
}

protected DomElement getParentDomElement(final AnActionEvent e) {
  final DomModelTreeView view = getTreeView(e);
  SimpleNode node = view.getTree().getSelectednode();
  if (node instanceof BaseDomElementNode) {
    if (((BaseDomElementNode)node).getConsolidatedChildrenDescriptions().size() > 0) {
      return ((BaseDomElementNode)node).getDomElement();
    }
  }
  final DomElementsGroupNode groupNode = getDomElementsGroupNode(view);

  return groupNode == null ? null : groupNode.getDomElement();
}

@Nullable
private static DomElementsGroupNode getDomElementsGroupNode(final DomModelTreeView treeView) {
  SimpleNode simpleNode = treeView.getTree().getSelectednode();
  while (simpleNode != null) {
    if (simpleNode instanceof DomElementsGroupNode) return (DomElementsGroupNode)simpleNode;

    simpleNode = simpleNode.getParent();
  }
  return null;
}

public void actionPerformed(AnActionEvent e,true);

  }
}

final public void update(AnActionEvent e) {
  final DomModelTreeView treeView = getTreeView(e);

  if (treeView != null) {
    update(e,treeView);
  }
  else {
    e.getPresentation().setEnabled(false);
  }
}

public void update(AnActionEvent e,DomModelTreeView treeView) {
  final SimpleNode selectednode = treeView.getTree().getSelectednode();

  if (selectednode instanceof DomFileElementNode) {
    e.getPresentation().setVisible(false);
    return;
  }

  boolean enabled = false;
  if (selectednode instanceof BaseDomElementNode) {
    final DomElement domElement = ((BaseDomElementNode)selectednode).getDomElement();
    if (domElement.isValid() && DomUtil.hasXml(domElement) && !(domElement.getParent() instanceof DomFileElement)) {
      enabled = true;
    }
  }

  e.getPresentation().setEnabled(enabled);


  if (enabled) {
    e.getPresentation().setText(getPresentationText(selectednode));
  }
  else {
    e.getPresentation().setText(ApplicationBundle.message("action.remove"));
  }

  e.getPresentation().setIcon(AllIcons.General.Remove);
}

public AddElementInCollectionAction(final DomModelTreeView treeView) {
  myTreeView = treeView;
}

protected DomModelTreeView getTreeView(AnActionEvent e) {
  if (myTreeView != null) return myTreeView;

  return DomModelTreeView.DATA_KEY.getData(e.getDataContext());
}

@Override
public void update(AnActionEvent e,DomModelTreeView treeView) {
  e.getPresentation().setVisible(treeView.getTree().getSelectednode() instanceof BaseDomElementNode);
  e.getPresentation().setText(ActionsBundle.message("action.EditSource.text"));
}

protected BaseDomTreeAction(DomModelTreeView treeView) {
  myTreeView = treeView;
}

protected DomModelTreeView getTreeView(AnActionEvent e) {
  if (myTreeView != null) return myTreeView;

  return DomModelTreeView.DATA_KEY.getData(e.getDataContext());
}

public DeleteDomElement(final DomModelTreeView treeView) {
  super(treeView);
}

public AddElementInCollectionAction(final DomModelTreeView treeView) {
  myTreeView = treeView;
}

protected DomModelTreeView getTreeView(AnActionEvent e) {
  if (myTreeView != null) return myTreeView;

  return DomModelTreeView.DATA_KEY.getData(e.getDataContext());
}

public void update(AnActionEvent e,DomModelTreeView treeView) {
  e.getPresentation().setVisible(treeView.getTree().getSelectednode() instanceof BaseDomElementNode);
  e.getPresentation().setText(ActionsBundle.message("action.EditSource.text"));
}

对于TTreeView,DestroyWnd将节点保存到流中,CreateWnd重新加载它们.在我们的具有非常大的树视图的应用程序中,这导致节点在流出和返回时的长延迟.

我的问题：如何防止这种延迟？我听说很多人高度评价Virtual TreeView,我认为这不是TTreeView的后代,是否避免了这个问题？我们尝试过Developer Express TcxTreeView,但它来自TTreeview,所以它遇到了同样的问题.

与标准的TTreeView不同,后者将数据存储在TreeView本身中.这就是为什么每次重新创建窗口时,TTreeView.DestroyWnd()和TTreeView.CreateWnd()都必须保存和恢复所有节点数据的副本.节点越多,管理该数据的开销就越大.