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with Interfaces.C;
with Interfaces.C.Strings;
with Ada.Strings.Unbounded;
with Ada.Containers;
with System;
use type System.Address;
use type Interfaces.C.int;
use type Interfaces.C.Strings.chars_ptr;
use type Ada.Containers.Count_Type;
with Ada.Text_IO;
package body FLTK.Text_Buffers is
function new_fl_text_buffer
(RS, PGS : in Interfaces.C.int)
return System.Address;
pragma Import (C, new_fl_text_buffer, "new_fl_text_buffer");
procedure free_fl_text_buffer
(TB : in System.Address);
pragma Import (C, free_fl_text_buffer, "free_fl_text_buffer");
procedure fl_text_buffer_add_modify_callback
(TB, CB, UD : in System.Address);
pragma Import (C, fl_text_buffer_add_modify_callback,
"fl_text_buffer_add_modify_callback");
procedure fl_text_buffer_add_predelete_callback
(TB, CB, UD : in System.Address);
pragma Import (C, fl_text_buffer_add_predelete_callback,
"fl_text_buffer_add_predelete_callback");
procedure Finalize
(This : in out Text_Buffer) is
begin
if This.Void_Ptr /= System.Null_Address then
if This in Text_Buffer then
free_fl_text_buffer (This.Void_Ptr);
end if;
end if;
end Finalize;
procedure Modify_Callback_Hook
(Pos, Inserted, Deleted, Restyled : in Interfaces.C.int;
Text : in Interfaces.C.Strings.chars_ptr;
UD : in System.Address);
pragma Convention (C, Modify_Callback_Hook);
procedure Modify_Callback_Hook
(Pos : in Interfaces.C.int;
Inserted, Deleted, Restyled : in Interfaces.C.int;
Text : in Interfaces.C.Strings.chars_ptr;
UD : in System.Address) is
package UStr renames Ada.Strings.Unbounded;
Action : Modification;
Place : Position := Position (Pos);
Length : Natural;
Deleted_Text : UStr.Unbounded_String := UStr.To_Unbounded_String ("");
Ada_Text_Buffer : access Text_Buffer :=
Text_Buffer_Convert.To_Pointer (UD);
begin
if Inserted > 0 then
Length := Natural (Inserted);
Action := Insert;
elsif Deleted > 0 then
Length := Natural (Deleted);
Action := Delete;
if Text /= Interfaces.C.Strings.Null_Ptr then
Deleted_Text := UStr.To_Unbounded_String (Interfaces.C.Strings.Value (Text));
end if;
elsif Restyled > 0 then
Length := Natural (Restyled);
Action := Restyle;
else
raise Program_Error;
end if;
for CB of Ada_Text_Buffer.Modify_CBs loop
CB.Call (Action, Place, Length, UStr.To_String (Deleted_Text));
end loop;
end Modify_Callback_Hook;
procedure Predelete_Callback_Hook
(Pos, Deleted : in Interfaces.C.int;
UD : in System.Address);
pragma Convention (C, Predelete_Callback_Hook);
procedure Predelete_Callback_Hook
(Pos, Deleted : in Interfaces.C.int;
UD : in System.Address) is
Place : Position := Position (Pos);
Length : Natural := Natural (Deleted);
Ada_Text_Buffer : access Text_Buffer :=
Text_Buffer_Convert.To_Pointer (UD);
begin
for CB of Ada_Text_Buffer.Predelete_CBs loop
CB.Call (Place, Length);
end loop;
end Predelete_Callback_Hook;
function Create
(Requested_Size : in Natural := 0;
Preferred_Gap_Size : in Natural := 1024)
return Text_Buffer is
begin
return This : Text_Buffer do
This.Void_Ptr := new_fl_text_buffer
(Interfaces.C.int (Requested_Size),
Interfaces.C.int (Preferred_Gap_Size));
This.Modify_CBs := Modify_Vectors.Empty_Vector;
This.Predelete_CBs := Predelete_Vectors.Empty_Vector;
end return;
end Create;
procedure Add_Modify_Callback
(This : in out Text_Buffer;
Func : not null access Modify_Callback'Class) is
begin
if This.Modify_CBs.Length = 0 then
fl_text_buffer_add_modify_callback
(This.Void_Ptr,
Modify_Callback_Hook'Address,
This'Address);
end if;
This.Modify_CBs.Append (Func);
end Add_Modify_Callback;
procedure Add_Predelete_Callback
(This : in out Text_Buffer;
Func : not null access Predelete_Callback'Class) is
begin
if This.Predelete_CBs.Length = 0 then
fl_text_buffer_add_predelete_callback
(This.Void_Ptr,
Predelete_Callback_Hook'Address,
This'Address);
end if;
This.Predelete_CBs.Append (Func);
end Add_Predelete_Callback;
end FLTK.Text_Buffers;
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