menu.cpp

通过类型姓名年龄类别来显示动物

//***********************************************
//* Menu.cpp: implementation of the Menu class. *
//***********************************************

#include <iostream.h>
#include "Menu.h"

void EatKeys()                // To clean up the input stream func

{
	while ( cin.rdbuf()->in_avail() > 0 ) cin.ignore(1);
}

Menu::Menu()                                    // Default constructor

{
  mTitle[0] = 0;                                // Set Title to zero
  mItemNumber = 0;                              // Set Items to zero
  for ( int i = 0; i < MAX_MENU_NUMBER; i++ )   // set Max Menu up to 20
      mMenuItems[i] = NULL;                     // set the array to null 
}

Menu::Menu( char * Title, char * CharItems[], int NoOfItems )

{     
	SetTitle ( Title );                         // Call SetTitle function
	for ( int i = 0; i < NoOfItems; i++ )       // The Items and # of Items

	{
		mMenuItems[i] = new char [strlen(CharItems[i])+1];
		strcpy ( mMenuItems[i], CharItems[i]);
	}

	mItemNumber = NoOfItems;
}

Menu::~Menu()                                    // Destructor

{
	for ( int i = 0; i < mItemNumber; i++ )       
	{
		if ( mMenuItems[i] != NULL )

		{
			delete [] mMenuItems[i];     // To delete MenuItems from the memory
			mMenuItems[i] = NULL;
		}
	}
	mItemNumber = 0;
}

void Menu::Display()                   // Display Menu info func

{
	cout<<"\t\t\t"<<mTitle<<endl<<endl;          // Display the Menu Title
	for ( int i = 0; i < mItemNumber; i++ )      // The Menu Items
		cout<<"\t\t\t"<<i+1<<' '<<mMenuItems[i]<<endl;// number + items
	cout<<"\n\t\t\tSelect An Option\n\t\t\tOr Press 0 To Return: ";// user options
}

int Menu::MakeChoice()

{
	int c;
	for(;;)

	{
		EatKeys();                          // Clean any junks!!!
	    clrscr();                           // Clear screen function
	    Display();                          // Diplay function
	    cin>>c;
	    cin.get();                          //'Enter' key
	    if ( 0 <= c && c <= mItemNumber )   // Selected item starting from 0
	    return c-1 ;                        // Returns -1 if cancel
	 cout << "\n\t\t\tWrong Selection !\n\t\t\tPress ENTER To Continue\n";
 	 while ( cin.get() != '\n' );
	}
}

//************************************************************************