TTreeView移动节点和图标

最新推荐文章于 2021-09-09 16:08:55 发布

chinayu2007

最新推荐文章于 2021-09-09 16:08:55 发布

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分类专栏： C++Builder6

本文链接：https://blog.youkuaiyun.com/chinayu2007/article/details/43340201

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本文介绍了一个用于TreeView控件的节点移动算法实现，该算法允许用户在树状结构中对选定节点进行上移或下移操作，并支持同级或跨级移动。通过具体的代码示例展示了如何在Delphi中实现这一功能。

void UpDownNode(TTreeNode * node,bool up,int level)
{
    TTreeNode *TargetNode;

  if (level!=-1) //同级间移动
  {
    if (node != NULL) //检查是否有选中节点 如果有则做上移操作
    {
      if (up) //上移
      {
        if (node->GetPrev() != NULL)
        {
          TargetNode = node->GetPrev();
          while (TargetNode->Level != level)
          {
            if (TargetNode->GetPrev()==NULL )
              break;
            else
              TargetNode = TargetNode->GetPrev();
          }
          if (TargetNode != NULL)
          {
            if (TargetNode->Level ==level)
            {
              if (node->getPrevSibling() != NULL)  //检查是否有同级前节点，如果有做上移操作
              {
                if (node->getPrevSibling() != NULL)
                  node->MoveTo(TargetNode,naInsert);
                else
                  node->MoveTo(TargetNode,naAddFirst);
              }  
              else
                  node->MoveTo(TargetNode,naAdd);

            }
          }
        }
      }
      else //下移
      {
        if (node->GetNext() != NULL)
        {
          TargetNode = node->GetNext();
          while (TargetNode->Level != level)
          {
            if (TargetNode->GetNext()==NULL)
              break;
            else
              TargetNode = TargetNode->GetNext();
          }
          if (TargetNode != NULL)
          {
            if (TargetNode->Level == level)
            {
              if (node->getNextSibling() != NULL) //检查是否有同级下节点，假如有作下移操作
              {
                if (TargetNode->getNextSibling() != NULL)
                  node->MoveTo(TargetNode->getNextSibling(),naInsert);
                else
                  node->MoveTo(TargetNode,naAdd);
              }
              else
                node->MoveTo(TargetNode,naInsert);

            }
          }
        }
      }
   }
  }
  else //容许跨级移动
  {
    if (node != NULL) //检查是否有选中节点 假如有则做上移操作
    {
      if (up) //上移
      {
        if (node->GetPrev() != NULL)
        {
          TargetNode = node->GetPrev();
          if (TargetNode != NULL)
          {
            if (node->GetPrev() != NULL)  //检查是否有同级前节点，如果有做上移操作
            {
              if (node->GetPrev() != NULL)
                node->MoveTo(TargetNode,naInsert);
              else
                node->MoveTo(TargetNode,naAddFirst);
            }
            else
              node->MoveTo(TargetNode,naAdd);

          }
        }
      }
      else //下移
      {
        if (node->GetNext() != NULL)
        {
          TargetNode = node->GetNext();
          while (TargetNode->Parent == node)
          {
            if (TargetNode->GetNext() == NULL)
              break;
            else
              TargetNode = TargetNode->GetNext();
          }
          if (TargetNode != NULL)
          {
            if (node->GetNext() != NULL) //检查是否有同级下节点，假如有上移操作
            {
              if (TargetNode->GetNext() != NULL)
                  node->MoveTo(TargetNode->GetNext(),naInsert);
                else
                  node->MoveTo(TargetNode,naAdd);
            }
            else
              node->MoveTo(TargetNode,naAdd);

          }
        }
      }
    }
  }
}

调用方法：

void __fastcall TForm1::Button12Click(TObject *Sender)
{
   UpDownNode(TreeView1->Selected,true,TreeView1->Selected->Level);//上移
   for(int i=1;i<TreeView1->Items->Count;i++)
   {
      TreeView1->Items->Item[i]->ImageIndex = i;
      TreeView1->Items->Item[i]->SelectedIndex = i;
      TreeView1->Items->Item[i]->StateIndex = i;
      //TreeView1->Items->Item[i]->TreeView->Invalidate();
   }
   TreeView1->Refresh();
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button13Click(TObject *Sender)
{
   UpDownNode(TreeView1->Selected,false,TreeView1->Selected->Level);下移
   for(int i=1;i<TreeView1->Items->Count;i++)
   {
      TreeView1->Items->Item[i]->ImageIndex = i;
      TreeView1->Items->Item[i]->SelectedIndex = i;
      TreeView1->Items->Item[i]->StateIndex = i;
      //TreeView1->Items->Item[i]->TreeView->Invalidate();
   }
   TreeView1->Refresh();
}