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{
Example 17. Panel Hiding and Showing example
from ncurses howto
}
program test_panel;
{$MODE OBJFPC}
uses
ncurses, panel, sysutils;
Type
PANEL_DATA = record
hide: Boolean; (* TRUE if panel is hidden *)
end;
PPWINDOW = ^PWINDOW;
const
NLINES = 10;
NCOLS = 40;
procedure print_in_middle(win: PWINDOW; starty, startx, width: Longint; str: AnsiString; color: chtype);
var
slength, x, y: Longint;
temp: Double;
begin
if win = nil then
win := stdscr;
getyx(win, y, x);
if startx <> 0 then
x := startx;
if starty <> 0 then
y := starty;
if width = 0 then
width := 80;
slength := Length(str);
temp := (width - slength)/ 2;
x := startx + round(temp);
wattron(win, color);
mvwaddstr(win, y, x, PChar(str));
wattroff(win, color);
refresh();
end;
(* Show the window with a border and a label *)
procedure win_show(win: PWINDOW; lab: AnsiString; label_color: Longint);
var
startx, starty, height, width: Smallint;
begin
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, lab, COLOR_PAIR(label_color));
end;
(* Put all the windows *)
procedure init_wins(wins: PPWINDOW; n: Longint);
var
x, y, i: Longint;
lab: AnsiString;
begin
y := 2;
x := 10;
for i := 0 to n - 1 do
begin
wins[i] := newwin(NLINES, NCOLS, y, x);
FmtStr(lab, 'Window Number %d', [i + 1]);
win_show(wins[i], lab, i + 1);
y += 3;
x += 7;
end
end;
var
my_wins: array[0..2] of PWINDOW;
my_panels: array[0..2] of PPANEL;
panel_datas: array[0..2] of PANEL_DATA;
temp: ^PANEL_DATA;
ch: chtype;
begin
try
(* 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, 'F1 to Exit');
attroff(COLOR_PAIR(4));
doupdate();
ch := getch;
while ch <> KEY_F(1) do
begin
case ch of
chtype('a'):
begin
temp := panel_userptr(my_panels[0]);
if temp^.hide = FALSE then
begin
hide_panel(my_panels[0]);
temp^.hide := TRUE;
end
else
begin
show_panel(my_panels[0]);
temp^.hide := FALSE;
end
end;
chtype('b'):
begin
temp := panel_userptr(my_panels[1]);
if temp^.hide = FALSE then
begin
hide_panel(my_panels[1]);
temp^.hide := TRUE;
end
else
begin
show_panel(my_panels[1]);
temp^.hide := FALSE;
end
end;
chtype('c'):
begin
temp := panel_userptr(my_panels[2]);
if temp^.hide = FALSE then
begin
hide_panel(my_panels[2]);
temp^.hide := TRUE;
end
else
begin
show_panel(my_panels[2]);
temp^.hide := FALSE;
end
end
else
end;
update_panels();
doupdate();
ch := getch;
end;
finally
endwin();
end;
end.
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