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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
--- $Revision$
--- 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;
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