示例“虚拟树视图"； C ++ Builder XE-XE7中的IterateSubtree

问题描述

限时删除！！

我需要一个示例，说明如何在C ++ Embarcadero Xe1-7中使用虚拟树视图" IterateSubtree .

I need an example how to use "virtual treeview" IterateSubtree in C++ Embarcadero Xe1-7.

我对此代码有疑问:

void __fastcall TMyForm::BuSearchClick(TObject *)
{
  MyTreeView->IterateSubtree(NULL, SearchDataSomeId, (void*)&PNodeData, TVirtualNodeStates(), false, false);
}

void __fastcall TMyForm::SearchDataSomeId(TBaseVirtualTree*, PVirtualNode Node, void *Data, bool &Abort)
{
}

编译器给出以下错误:

[bcc32 Error] MyFile.cpp(363): E2034 Cannot convert 'void (_fastcall * (_closure )(TBaseVirtualTree *,TVirtualNode *,void *,bool &))(TBaseVirtualTree *,TVirtualNode *,void *,bool &)' to '_di_TVTGetNodeProc'

推荐答案

非常感谢`

我找到了解决方法

typedef void (*TIterateSubtreeCallBack)(TBaseVirtualTree*, PVirtualNode Node, void *_Data, bool &Abort);

class TMyVTGetNodeProcRef : public TCppInterfacedObject<TVTGetNodeProc>
{
private:
  TIterateSubtreeCallBack callback;
public:
  TMyVTGetNodeProcRef(TIterateSubtreeCallBack _callback) : callback(_callback) {}
  INTFOBJECT_IMPL_IUNKNOWN(TInterfacedObject);

  void __fastcall Invoke(TBaseVirtualTree* Sender, TVirtualNode *Node, void *Data, bool &Abort)
  {
    return callback(Sender, Node, Data, Abort);
  }
};

void __fastcall TMyForm::BuSearchClick(TObject *)
{
  Node= MyTreeView->IterateSubtree(NULL, new TMyVTGetNodeProcRef(SearchDataId), (void*)&PNodeData, TVirtualNodeStates(), false, false);
}

void TMyForm::SearchDataId(TBaseVirtualTree*Tr, PVirtualNode Node, void *_Data, bool &Abort)
{
 put my code ...
}
//---------------------------------------------------------------------------

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