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ncurses2-demo_forms.adb
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------------------------------------------------------------------------------
-- --
-- GNAT ncurses Binding Samples --
-- --
-- ncurses --
-- --
-- B O D Y --
-- --
------------------------------------------------------------------------------
-- Copyright (c) 2000 Free Software Foundation, Inc. --
-- --
-- Permission is hereby granted, free of charge, to any person obtaining a --
-- copy of this software and associated documentation files (the --
-- "Software"), to deal in the Software without restriction, including --
-- without limitation the rights to use, copy, modify, merge, publish, --
-- distribute, distribute with modifications, sublicense, and/or sell --
-- copies of the Software, and to permit persons to whom the Software is --
-- furnished to do so, subject to the following conditions: --
-- --
-- The above copyright notice and this permission notice shall be included --
-- in all copies or substantial portions of the Software. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --
-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --
-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --
-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --
-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
-- --
-- Except as contained in this notice, the name(s) of the above copyright --
-- holders shall not be used in advertising or otherwise to promote the --
-- sale, use or other dealings in this Software without prior written --
-- authorization. --
------------------------------------------------------------------------------
-- Author: Eugene V. Melaragno <aldomel@ix.netcom.com> 2000
-- Version Control
-- $Revision: 1.1 $
-- Binding Version 01.00
------------------------------------------------------------------------------
with ncurses2.util; use ncurses2.util;
with Terminal_Interface.Curses; use Terminal_Interface.Curses;
with Terminal_Interface.Curses.Forms; use Terminal_Interface.Curses.Forms;
with Terminal_Interface.Curses.Forms.Field_User_Data;
with Ada.Characters.Handling;
with Ada.Strings;
with Ada.Strings.Bounded;
procedure ncurses2.demo_forms is
package BS is new Ada.Strings.Bounded.Generic_Bounded_Length (80);
type myptr is access Integer;
-- The C version stores a pointer in the userptr and
-- converts it into a long integer.
-- The correct, but inconvenient way to do it is to use a
-- pointer to long and keep the pointer constant.
-- It just adds one memory piece to allocate and deallocate (not done here)
package StringData is new
Terminal_Interface.Curses.Forms.Field_User_Data (Integer, myptr);
function edit_secure (me : Field; c_in : Key_Code) return Key_Code;
function form_virtualize (f : Form; w : Window) return Key_Code;
function my_form_driver (f : Form; c : Key_Code) return Boolean;
function make_label (frow : Line_Position;
fcol : Column_Position;
label : String) return Field;
function make_field (frow : Line_Position;
fcol : Column_Position;
rows : Line_Count;
cols : Column_Count;
secure : Boolean) return Field;
procedure display_form (f : Form);
procedure erase_form (f : Form);
-- prints '*' instead of characters.
-- Not that this keeps a bug from the C version:
-- type in the psasword field then move off and back.
-- the cursor is at position one, but
-- this assumes it as at the end so text gets appended instead
-- of overwtitting.
function edit_secure (me : Field; c_in : Key_Code) return Key_Code is
rows, frow : Line_Position;
nrow : Natural;
cols, fcol : Column_Position;
nbuf : Buffer_Number;
c : Key_Code := c_in;
c2 : Character;
use StringData;
begin
Info (me, rows, cols, frow, fcol, nrow, nbuf);
-- TODO if result = Form_Ok and nbuf > 0 then
-- C version checked the return value
-- of Info, the Ada binding throws an exception I think.
if nbuf > 0 then
declare
temp : BS.Bounded_String;
temps : String (1 .. 10);
-- TODO Get_Buffer povides no information on the field length?
len : myptr;
begin
Get_Buffer (me, 1, Str => temps);
-- strcpy(temp, field_buffer(me, 1));
Get_User_Data (me, len);
temp := BS.To_Bounded_String (temps (1 .. len.all));
if c <= Key_Max then
c2 := Code_To_Char (c);
if Ada.Characters.Handling.Is_Graphic (c2) then
BS.Append (temp, c2);
len.all := len.all + 1;
Set_Buffer (me, 1, BS.To_String (temp));
c := Character'Pos ('*');
else
c := 0;
end if;
else
case c is
when REQ_BEG_FIELD |
REQ_CLR_EOF |
REQ_CLR_EOL |
REQ_DEL_LINE |
REQ_DEL_WORD |
REQ_DOWN_CHAR |
REQ_END_FIELD |
REQ_INS_CHAR |
REQ_INS_LINE |
REQ_LEFT_CHAR |
REQ_NEW_LINE |
REQ_NEXT_WORD |
REQ_PREV_WORD |
REQ_RIGHT_CHAR |
REQ_UP_CHAR =>
c := 0; -- we don't want to do inline editing
when REQ_CLR_FIELD =>
if len.all /= 0 then
temp := BS.To_Bounded_String ("");
Set_Buffer (me, 1, BS.To_String (temp));
len.all := 0;
end if;
when REQ_DEL_CHAR |
REQ_DEL_PREV =>
if len.all /= 0 then
BS.Delete (temp, BS.Length (temp), BS.Length (temp));
Set_Buffer (me, 1, BS.To_String (temp));
len.all := len.all - 1;
end if;
when others => null;
end case;
end if;
end;
end if;
return c;
end edit_secure;
mode : Key_Code := REQ_INS_MODE;
function form_virtualize (f : Form; w : Window) return Key_Code is
type lookup_t is record
code : Key_Code;
result : Key_Code;
-- should be Form_Request_Code, but we need MAX_COMMAND + 1
end record;
lookup : constant array (Positive range <>) of lookup_t :=
(
(
Character'Pos ('A') mod 16#20#, REQ_NEXT_CHOICE
),
(
Character'Pos ('B') mod 16#20#, REQ_PREV_WORD
),
(
Character'Pos ('C') mod 16#20#, REQ_CLR_EOL
),
(
Character'Pos ('D') mod 16#20#, REQ_DOWN_FIELD
),
(
Character'Pos ('E') mod 16#20#, REQ_END_FIELD
),
(
Character'Pos ('F') mod 16#20#, REQ_NEXT_PAGE
),
(
Character'Pos ('G') mod 16#20#, REQ_DEL_WORD
),
(
Character'Pos ('H') mod 16#20#, REQ_DEL_PREV
),
(
Character'Pos ('I') mod 16#20#, REQ_INS_CHAR
),
(
Character'Pos ('K') mod 16#20#, REQ_CLR_EOF
),
(
Character'Pos ('L') mod 16#20#, REQ_LEFT_FIELD
),
(
Character'Pos ('M') mod 16#20#, REQ_NEW_LINE
),
(
Character'Pos ('N') mod 16#20#, REQ_NEXT_FIELD
),
(
Character'Pos ('O') mod 16#20#, REQ_INS_LINE
),
(
Character'Pos ('P') mod 16#20#, REQ_PREV_FIELD
),
(
Character'Pos ('R') mod 16#20#, REQ_RIGHT_FIELD
),
(
Character'Pos ('S') mod 16#20#, REQ_BEG_FIELD
),
(
Character'Pos ('U') mod 16#20#, REQ_UP_FIELD
),
(
Character'Pos ('V') mod 16#20#, REQ_DEL_CHAR
),
(
Character'Pos ('W') mod 16#20#, REQ_NEXT_WORD
),
(
Character'Pos ('X') mod 16#20#, REQ_CLR_FIELD
),
(
Character'Pos ('Y') mod 16#20#, REQ_DEL_LINE
),
(
Character'Pos ('Z') mod 16#20#, REQ_PREV_CHOICE
),
(
Character'Pos ('[') mod 16#20#, -- ESCAPE
Form_Request_Code'Last + 1
),
(
Key_Backspace, REQ_DEL_PREV
),
(
KEY_DOWN, REQ_DOWN_CHAR
),
(
Key_End, REQ_LAST_FIELD
),
(
Key_Home, REQ_FIRST_FIELD
),
(
KEY_LEFT, REQ_LEFT_CHAR
),
(
KEY_LL, REQ_LAST_FIELD
),
(
Key_Next, REQ_NEXT_FIELD
),
(
KEY_NPAGE, REQ_NEXT_PAGE
),
(
KEY_PPAGE, REQ_PREV_PAGE
),
(
Key_Previous, REQ_PREV_FIELD
),
(
KEY_RIGHT, REQ_RIGHT_CHAR
),
(
KEY_UP, REQ_UP_CHAR
),
(
Character'Pos ('Q') mod 16#20#, -- QUIT
Form_Request_Code'Last + 1 -- TODO MAX_FORM_COMMAND + 1
)
);
c : Key_Code := Getchar (w);
me : Field := Current (f);
begin
if c = Character'Pos (']') mod 16#20# then
if mode = REQ_INS_MODE then
mode := REQ_OVL_MODE;
else
mode := REQ_INS_MODE;
end if;
c := mode;
else
for n in lookup'Range loop
if lookup (n).code = c then
c := lookup (n).result;
exit;
end if;
end loop;
end if;
-- Force the field that the user is typing into to be in reverse video,
-- while the other fields are shown underlined.
if c <= Key_Max then
c := edit_secure (me, c);
Set_Background (me, (Reverse_Video => True, others => False));
elsif c <= Form_Request_Code'Last then
c := edit_secure (me, c);
Set_Background (me, (Under_Line => True, others => False));
end if;
return c;
end form_virtualize;
function my_form_driver (f : Form; c : Key_Code) return Boolean is
flag : Driver_Result := Driver (f, F_Validate_Field);
begin
if c = Form_Request_Code'Last + 1
and flag = Form_Ok then
return True;
else
Beep;
return False;
end if;
end my_form_driver;
function make_label (frow : Line_Position;
fcol : Column_Position;
label : String) return Field is
f : Field := Create (1, label'Length, frow, fcol, 0, 0);
o : Field_Option_Set := Get_Options (f);
begin
if f /= Null_Field then
Set_Buffer (f, 0, label);
o.Active := False;
Set_Options (f, o);
end if;
return f;
end make_label;
function make_field (frow : Line_Position;
fcol : Column_Position;
rows : Line_Count;
cols : Column_Count;
secure : Boolean) return Field is
f : Field;
use StringData;
len : myptr;
begin
if secure then
f := Create (rows, cols, frow, fcol, 0, 1);
else
f := Create (rows, cols, frow, fcol, 0, 0);
end if;
if f /= Null_Field then
Set_Background (f, (Under_Line => True, others => False));
len := new Integer;
len.all := 0;
Set_User_Data (f, len);
end if;
return f;
end make_field;
procedure display_form (f : Form) is
w : Window;
rows : Line_Count;
cols : Column_Count;
begin
Scale (f, rows, cols);
w := New_Window (rows + 2, cols + 4, 0, 0);
if w /= Null_Window then
Set_Window (f, w);
Set_Sub_Window (f, Derived_Window (w, rows, cols, 1, 2));
Box (w); -- 0,0
Set_KeyPad_Mode (w, True);
end if;
-- TODO if Post(f) /= Form_Ok then it's a procedure
declare
begin
Post (f);
exception
when
Eti_System_Error |
Eti_Bad_Argument |
Eti_Posted |
Eti_Connected |
Eti_Bad_State |
Eti_No_Room |
Eti_Not_Posted |
Eti_Unknown_Command |
Eti_No_Match |
Eti_Not_Selectable |
Eti_Not_Connected |
Eti_Request_Denied |
Eti_Invalid_Field |
Eti_Current =>
Refresh (w);
end;
-- end if;
end display_form;
procedure erase_form (f : Form) is
w : Window := Get_Window (f);
s : Window := Get_Sub_Window (f);
begin
Post (f, False);
Erase (w);
Refresh (w);
Delete (s);
Delete (w);
end erase_form;
finished : Boolean := False;
f : Field_Array_Access := new Field_Array (1 .. 12);
secure : Field;
myform : Form;
w : Window;
c : Key_Code;
result : Driver_Result;
begin
Move_Cursor (Line => 18, Column => 0);
Add (Str => "Defined form-traversal keys: ^Q/ESC- exit form");
Add (Ch => newl);
Add (Str => "^N -- go to next field ^P -- go to previous field");
Add (Ch => newl);
Add (Str => "Home -- go to first field End -- go to last field");
Add (Ch => newl);
Add (Str => "^L -- go to field to left ^R -- go to field to right");
Add (Ch => newl);
Add (Str => "^U -- move upward to field ^D -- move downward to field");
Add (Ch => newl);
Add (Str => "^W -- go to next word ^B -- go to previous word");
Add (Ch => newl);
Add (Str => "^S -- go to start of field ^E -- go to end of field");
Add (Ch => newl);
Add (Str => "^H -- delete previous char ^Y -- delete line");
Add (Ch => newl);
Add (Str => "^G -- delete current word ^C -- clear to end of line");
Add (Ch => newl);
Add (Str => "^K -- clear to end of field ^X -- clear field");
Add (Ch => newl);
Add (Str => "Arrow keys move within a field as you would expect.");
Add (Line => 4, Column => 57, Str => "Forms Entry Test");
Refresh;
-- describe the form
f (1) := make_label (0, 15, "Sample Form");
f (2) := make_label (2, 0, "Last Name");
f (3) := make_field (3, 0, 1, 18, False);
f (4) := make_label (2, 20, "First Name");
f (5) := make_field (3, 20, 1, 12, False);
f (6) := make_label (2, 34, "Middle Name");
f (7) := make_field (3, 34, 1, 12, False);
f (8) := make_label (5, 0, "Comments");
f (9) := make_field (6, 0, 4, 46, False);
f (10) := make_label (5, 20, "Password:");
f (11) := make_field (5, 30, 1, 9, True);
secure := f (11);
f (12) := Null_Field;
myform := New_Form (f);
display_form (myform);
w := Get_Window (myform);
Set_Raw_Mode (SwitchOn => True);
Set_NL_Mode (SwitchOn => True); -- lets us read ^M's
while not finished loop
c := form_virtualize (myform, w);
result := Driver (myform, c);
case result is
when Form_Ok =>
Add (Line => 5, Column => 57, Str => Get_Buffer (secure, 1));
Clear_To_End_Of_Line;
Refresh;
when Unknown_Request =>
finished := my_form_driver (myform, c);
when others =>
Beep;
end case;
end loop;
erase_form (myform);
-- TODO Free_Form(myform);
-- for (c = 0; f[c] != 0; c++) free_field(f[c]);
Set_Raw_Mode (SwitchOn => False);
Set_NL_Mode (SwitchOn => True);
end ncurses2.demo_forms;
