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223 | -- Ada_GUI implementation based on Gnoga. Adapted 2021
-- --
-- GNOGA - The GNU Omnificent GUI for Ada --
-- --
-- G N O G A . A P P L I C A T I O N --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 2014 David Botton --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, or (at your option) any --
-- later version. This library is distributed in the hope that it will be --
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are --
-- granted additional permissions described in the GCC Runtime Library --
-- Exception, version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- For more information please go to http://www.gnoga.com --
------------------------------------------------------------------------------
--
-- Changed by J. Carter 2021 to only run "singleton" applications
-- 2022 Improved OS detection
with GNAT.OS_Lib;
with Ada.Directories;
with Ada.Task_Identification;
with Ada_GUI.Gnoga.Server.Connection;
package body Ada_GUI.Gnoga.Application is
procedure Set_Title (Name : in String);
procedure Set_End_Text (Text : in String);
procedure Open_URL (URL : in String);
procedure Set_Favicon (Name : in String);
App_Name : Ada.Strings.Unbounded.Unbounded_String := Ada.Strings.Unbounded.To_Unbounded_String ("Ada GUI - An Ada-oriented GUI");
HTML_For_On_Close : Ada.Strings.Unbounded.Unbounded_String;
Favicon_URL : Ada.Strings.Unbounded.Unbounded_String;
----------------------
-- Application_Name --
----------------------
procedure Set_Title (Name : in String) is
begin
App_Name := Ada.Strings.Unbounded.To_Unbounded_String (Name);
end Set_Title;
-------------------
-- HTML_On_Close --
-------------------
procedure Set_End_Text (Text : String) is
begin
HTML_For_On_Close := Ada.Strings.Unbounded.To_Unbounded_String (Text);
end Set_End_Text;
function HTML_On_Close return String is
begin
return Ada.Strings.Unbounded.To_String (HTML_For_On_Close);
end HTML_On_Close;
--------------
-- Open_URL --
--------------
Open_Mac : constant String := "/usr/bin/open";
Open_Unix : constant String := "/usr/bin/xdg-open";
Open_Windows : constant String := "cmd /c start";
procedure Open_URL (URL : in String) is
Args : GNAT.OS_Lib.Argument_List_Access;
PID : GNAT.OS_Lib.Process_Id;
begin
Args := GNAT.OS_Lib.Argument_String_To_List
( (if Ada.Directories.Current_Directory (1) /= '/' then Open_Windows
elsif Ada.Directories.Exists (Open_Unix) then Open_Unix
elsif Ada.Directories.Exists (Open_Mac) then Open_Mac
else raise Program_Error with "Operating system cannot be determined") &
' ' & URL);
PID := GNAT.OS_Lib.Non_Blocking_Spawn
(Program_Name => Args (Args'First).all,
Args => Args (Args'First + 1 .. Args'Last));
Gnat.OS_Lib.Free (Arg => Args);
end Open_URL;
-------------------
-- Favicon --
-------------------
procedure Set_Favicon (Name : in String) is
begin
Favicon_URL := Ada.Strings.Unbounded.To_Unbounded_String (Name);
end Set_Favicon;
function Favicon return String is
begin
return Ada.Strings.Unbounded.To_String (Favicon_URL);
end Favicon;
Connection_ID : Gnoga.Connection_ID := No_Connection;
-- Set after Initialization
Application_Holder : Gnoga.Server.Connection.Connection_Holder_Type;
-- Used to block Initialize until On_Connect is called
Connection_Holder : Gnoga.Server.Connection.Connection_Holder_Type;
-- Used to hold the single incoming connection
procedure On_Connect
(ID : in Gnoga.Connection_ID;
Connection : access Gnoga.Server.Connection.Connection_Holder_Type);
-- Connection On_Connect handler
---------------------
-- Web_Server_Task --
---------------------
task type Web_Server_Task is
entry Start;
end Web_Server_Task;
task body Web_Server_Task is
begin
accept Start;
Gnoga.Server.Connection.Run;
end Web_Server_Task;
Web_Server : Web_Server_Task;
----------------
-- On_Connect --
----------------
procedure On_Connect
(ID : in Gnoga.Connection_ID;
Connection : access Gnoga.Server.Connection.Connection_Holder_Type)
is
begin
if Connection_ID = No_Connection then
Connection_ID := ID;
Application_Holder.Release;
Connection.Hold;
Connection_Holder.Release;
Gnoga.Gui.Event_Queue.Enqueue
(New_Item => (Event => Ada.Strings.Unbounded.To_Unbounded_String (Closed_Text), others => <>) );
Gnoga.Server.Connection.Stop;
else
Gnoga.Server.Connection.Execute_Script
(ID, "document.writeln ('Only one connection permitted.');");
end if;
end On_Connect;
----------------
-- Initialize --
----------------
procedure Initialize
(Main_Window : in out Gnoga.Gui.Window.Window_Type'Class;
ID : in Positive := 8080;
Title : in String := "Ada-GUI Application";
Icon : in String := "favicon.ico")
is
begin
Set_Title (Name => Title);
Set_End_Text (Text => Title & " ended");
Set_Favicon (Name => Icon);
Open_URL (URL => "http://127.0.0.1:" & Left_Trim (ID'Image) );
Gnoga.Activate_Exception_Handler (ID => Ada.Task_Identification.Current_Task);
Gnoga.Server.Connection.Initialize (Host => "localhost", Port => ID, Boot => "boot.html", Verbose => True);
Gnoga.Write_To_Console (Message => "If closing the browser or browser tab does not end the program, press Ctrl-C");
Gnoga.Server.Connection.On_Connect_Handler (Event => On_Connect'Access);
Web_Server.Start;
Application_Holder.Hold;
Main_Window.Attach (Connection_ID => Connection_ID);
Gnoga.Server.Connection.HTML_On_Close (ID => Connection_ID, HTML => HTML_On_Close);
Main_Window.Document.Title (Value => Title);
Log (Message => "Sending to single route from " & Gnoga.Server.Connection.Connection_Client_Address (Connection_ID) );
end Initialize;
---------------------
-- End_Application --
---------------------
procedure End_Application is
begin
Gnoga.Server.Connection.Close (Connection_ID);
end End_Application;
end Ada_GUI.Gnoga.Application;
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