text: #include <panel.h>
  #include <string.h>
  
  typedef struct _PANEL_DATA {
  	int hide;	/* TRUE if panel is hidden */
  }PANEL_DATA;
  
  #define NLINES 10
  #define NCOLS 40
  
  void init_wins(WINDOW **wins, int n);
  void win_show(WINDOW *win, char *label, int label_color);
  void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color);
  
  int main()
  {	WINDOW *my_wins[3];
  	PANEL  *my_panels[3];
  	PANEL_DATA panel_datas[3];
  	PANEL_DATA *temp;
  	int ch;
  
  	/* Initialize curses */
  	initscr();
  	start_color();
  	cbreak();
  	noecho();
  	keypad(stdscr, TRUE);
  
  	/* Initialize all the colors */
  	init_pair(1, COLOR_RED, COLOR_BLACK);
  	init_pair(2, COLOR_GREEN, COLOR_BLACK);
  	init_pair(3, COLOR_BLUE, COLOR_BLACK);
  	init_pair(4, COLOR_CYAN, COLOR_BLACK);
  
  	init_wins(my_wins, 3);
  	
  	/* Attach a panel to each window */ 	/* Order is bottom up */
  	my_panels[0] = new_panel(my_wins[0]); 	/* Push 0, order: stdscr-0 */
  	my_panels[1] = new_panel(my_wins[1]); 	/* Push 1, order: stdscr-0-1 */
  	my_panels[2] = new_panel(my_wins[2]); 	/* Push 2, order: stdscr-0-1-2 */
  
  	/* Initialize panel datas saying that nothing is hidden */
  	panel_datas[0].hide = FALSE;
  	panel_datas[1].hide = FALSE;
  	panel_datas[2].hide = FALSE;
  
  	set_panel_userptr(my_panels[0], &panel_datas[0]);
  	set_panel_userptr(my_panels[1], &panel_datas[1]);
  	set_panel_userptr(my_panels[2], &panel_datas[2]);
  
  	/* Update the stacking order. 2nd panel will be on top */
  	update_panels();
  
  	/* Show it on the screen */
  	attron(COLOR_PAIR(4));
  	mvprintw(LINES - 3, 0, "Show or Hide a window with 'a'(first window)  'b'(Second Window)  'c'(Third Window)");
  	mvprintw(LINES - 2, 0, "q to Exit");
  
  	attroff(COLOR_PAIR(4));
  	doupdate();
  
  	while((ch = getch()) != 'q')
  	{	switch(ch)
  		{	case 'a':			
  				temp = (PANEL_DATA *)panel_userptr(my_panels[0]);
  				if(temp->hide == FALSE)
  				{	hide_panel(my_panels[0]);
  					temp->hide = TRUE;
  				}
  				else
  				{	show_panel(my_panels[0]);
  					temp->hide = FALSE;
  				}
  				break;
  			case 'b':
  				temp = (PANEL_DATA *)panel_userptr(my_panels[1]);
  				if(temp->hide == FALSE)
  				{	hide_panel(my_panels[1]);
  					temp->hide = TRUE;
  				}
  				else
  				{	show_panel(my_panels[1]);
  					temp->hide = FALSE;
  				}
  				break;
  			case 'c':
  				temp = (PANEL_DATA *)panel_userptr(my_panels[2]);
  				if(temp->hide == FALSE)
  				{	hide_panel(my_panels[2]);
  					temp->hide = TRUE;
  				}
  				else
  				{	show_panel(my_panels[2]);
  					temp->hide = FALSE;
  				}
  				break;
  		}
  		update_panels();
  		doupdate();
  	}
  	endwin();
  	return 0;
  }
  
  /* Put all the windows */
  void init_wins(WINDOW **wins, int n)
  {	int x, y, i;
  	char label[80];
  
  	y = 2;
  	x = 10;
  	for(i = 0; i < n; ++i)
  	{	wins[i] = newwin(NLINES, NCOLS, y, x);
  		sprintf(label, "Window Number %d", i + 1);
  		win_show(wins[i], label, i + 1);
  		y += 3;
  		x += 7;
  	}
  }
  
  /* Show the window with a border and a label */
  void win_show(WINDOW *win, char *label, int label_color)
  {	int startx, starty, height, width;
  
  	getbegyx(win, starty, startx);
  	getmaxyx(win, height, width);
  
  	box(win, 0, 0);
  	mvwaddch(win, 2, 0, ACS_LTEE); 
  	mvwhline(win, 2, 1, ACS_HLINE, width - 2); 
  	mvwaddch(win, 2, width - 1, ACS_RTEE); 
  	
  	print_in_middle(win, 1, 0, width, label, COLOR_PAIR(label_color));
  }
  
  void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color)
  {	int length, x, y;
  	float temp;
  
  	if(win == NULL)
  		win = stdscr;
  	getyx(win, y, x);
  	if(startx != 0)
  		x = startx;
  	if(starty != 0)
  		y = starty;
  	if(width == 0)
  		width = 80;
  
  	length = strlen(string);
  	temp = (width - length)/ 2;
  	x = startx + (int)temp;
  	wattron(win, color);
  	mvwprintw(win, y, x, "%s", string);
  	wattroff(win, color);
  	refresh();
  }
  