TreeView Demo : TreeView « GUI Form « Visual C++ .NET

1. Visual C++ .NET
2. GUI Form
3. TreeView

TreeView Demo

 

  using namespace System;
  using namespace System::ComponentModel;
  using namespace System::Collections;
  using namespace System::Windows::Forms;
  using namespace System::Data;
  using namespace System::Drawing;

  public ref class Form1 : public System::Windows::Forms::Form
  {
  public:
    Form1(void)
    {
      InitializeComponent();
    }

        System::Windows::Forms::TreeView^  tView;
        System::Windows::Forms::ImageList^  imFolders;
        System::ComponentModel::IContainer^  components;

    void InitializeComponent(void)
    {
            this->components = (gcnew System::ComponentModel::Container());
            System::Windows::Forms::TreeNode^ treeNode1 =
                (gcnew System::Windows::Forms::TreeNode(L"<holder>"));
            System::Windows::Forms::TreeNode^ treeNode2 =
                (gcnew System::Windows::Forms::TreeNode(
                    L"Root Node A", 0, 1,
                    gcnew cli::array< System::Windows::Forms::TreeNode^ >(1)
                    {treeNode1}));
            System::Windows::Forms::TreeNode^ treeNode3 =
                (gcnew System::Windows::Forms::TreeNode(L"<holder>"));

            System::Windows::Forms::TreeNode^ treeNode4 =
                (gcnew System::Windows::Forms::TreeNode(
                    L"Root Node B", 0, 1,
                    gcnew cli::array< System::Windows::Forms::TreeNode^ >(1)
                    {treeNode3}));
            System::ComponentModel::ComponentResourceManager^ resources =
       (gcnew System::ComponentModel::ComponentResourceManager(Form1::typeid));
            this->tView = (gcnew System::Windows::Forms::TreeView());
            this->imFolders =
                (gcnew System::Windows::Forms::ImageList(this->components));
            this->SuspendLayout();
            //
            // tView
            //
            this->tView->Dock = System::Windows::Forms::DockStyle::Fill;
            this->tView->ImageIndex = 0;
            this->tView->ImageList = this->imFolders;
            this->tView->LabelEdit = true;
            this->tView->Location = System::Drawing::Point(0, 0);
            this->tView->Name = L"tView";
            treeNode1->Name = L"Node1";
            treeNode1->Text = L"<holder>";
            treeNode2->ImageIndex = 0;
            treeNode2->Name = L"Node0";
            treeNode2->SelectedImageIndex = 1;
            treeNode2->Text = L"Root Node A";
            treeNode3->Name = L"Node3";
            treeNode3->Text = L"<holder>";
            treeNode4->ImageIndex = 0;
            treeNode4->Name = L"Node2";
            treeNode4->SelectedImageIndex = 1;
            treeNode4->Text = L"Root Node B";
            this->tView->Nodes->AddRange(
                gcnew cli::array< System::Windows::Forms::TreeNode^ >(2)
                    {treeNode2, treeNode4});
            this->tView->SelectedImageIndex = 1;
            this->tView->Size = System::Drawing::Size(194, 481);
            this->tView->TabIndex = 0;
            this->tView->BeforeExpand +=
                gcnew System::Windows::Forms::TreeViewCancelEventHandler(this,
                                                  &Form1::tView_BeforeExpand);
            //
            // imFolders
            //
            this->imFolders->ImageStream =
                (cli::safe_cast<System::Windows::Forms::ImageListStreamer^ >
                (resources->GetObject(L"imFolders.ImageStream")));
            this->imFolders->Images->SetKeyName(0, L"CLSDFOLD.ICO");
            this->imFolders->Images->SetKeyName(1, L"OPENFOLD.ICO");
            //
            // Form1

            //
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(194, 481);
            this->Controls->Add(this->tView);
            this->Name = L"Form1";
            this->Text = L"Tree View Example";
            this->ResumeLayout(false);
    }

        System::Void tView_BeforeExpand(System::Object^ sender,
                            System::Windows::Forms::TreeViewCancelEventArgs^ e)
        {
            // Already expanded before?
            if (e->Node->Nodes->Count > 1)
                return;  // Already expanded
            else if (e->Node->Nodes->Count == 1)
            {
                if (e->Node->Nodes[0]->Text->Equals("<holder>"))
                    e->Node->Nodes->RemoveAt(0); // Node ready for expanding
                else
                    return; // Already expanded but only one sub node
            }
            // Randomly expand the node
            Random ^rand = gcnew Random();
            int rnd = rand->Next(1,5);
            for (int i = 0; i < rnd; i++) // Randon number of subnodes
            {
                TreeNode ^stn =
                    gcnew TreeNode(String::Format("Sub Node {0}", i+1), 0, 1);
                e->Node->Nodes->Add(stn);

                if (rand->Next(2) == 1)  // Has sub sub-nodes
                    stn->Nodes->Add(gcnew TreeNode("<holder>", 0, 1));
            }
        }
  };
}

[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
  Application::Run(gcnew Form1());
  return 0;
}

   
  

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