/*_______________________________________________
                      S I M P L E   S T A C K   D E M O
                                     Ron Kessler
                               Created 7/6/2015

This project demonstrates how a stack structure works.
You add names to the stack and then when you pop the
items off the stack they will be added to the listbox.
The stack is based on LIFO (Last in, first out).
_________________________________________________
*/

#pragma once

namespace StackDemo {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections::Generic;         //add generic
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

/**************START OF MY CODE****************

//btnAdd is set as the AcceptButton on the form

#pragma region    Declarations & Form Activated

        static Stack<String^>^ customersStack = gcnew Stack<String^>();   //create our stack structure
        static String^ MSGTITLE = "Working with Stack Structures";                //msgbox caption
        


        private: System::Void Form1_Activated(System::Object^  sender, System::EventArgs^  e) 
                {
                         txtNewItem->Focus();    //set cursor to start with
                }

#pragma endregion

#pragma region  Add to Stack & Listbox

        private: System::Void btnAdd_Click(System::Object^  sender, System::EventArgs^  e) 
        
                     {
                        //---add items to the stack and the first listbox so we can see the order entered
                        if(txtNewItem->Text !="" )
                                {
                                    String^ custName = txtNewItem->Text->Trim();
                                    lstItems->Items->Add(custName);

                                    //---push custName onto the stack.
                                    customersStack->Push(custName);

                                    //---make it easy to add another name
                                    txtNewItem->Clear();
                                    txtNewItem->Focus();
                                }
                                else
                                    NotifyUser("Please enter a customer name.");
                     }

#pragma endregion

#pragma region POP Items OFF Stack

 private: System::Void btnPOP_Click(System::Object^  sender, System::EventArgs^  e) 
                  {
                      lstStackItems->Items->Clear();       //Start fresh
                      while (customersStack->Count > 0)  //make sure there is something on the stack
                          {
                               lstStackItems->Items->Add(customersStack->Pop()); //POP removes the TOP item
                          }
                  }
#pragma endregion

#pragma region  Notify User & Clear Items & Exit

        private:System::Void NotifyUser(String^ msg)
                  {
                      MessageBox::Show(msg, MSGTITLE, MessageBoxButtons::OK, MessageBoxIcon::Exclamation);
                     
                  }
                   private: System::Void btnClearItems_Click(System::Object^  sender, System::EventArgs^  e) 
                 {
                       lstItems->Items->Clear();
                       txtNewItem->Clear();
                       txtNewItem->Focus();
                 
                 }
         private: System::Void btnClearStackItems_Click(System::Object^  sender, System::EventArgs^  e) 
                {
                       lstStackItems->Items->Clear();
                }
        private: System::Void btnClose_Click(System::Object^  sender, System::EventArgs^  e) 
               {
                       this->Close();
               }
       
       
#pragma endregion