Mega Code Archive
TreeView Demo
<![CDATA[
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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