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ada_gui-gnoga-gui-element-canvas.adb
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-- Ada_GUI implementation based on Gnoga. Adapted 2021
-- --
-- GNOGA - The GNU Omnificent GUI for Ada --
-- --
-- G N O G A . G U I . E L E M E N T . C A N V A S --
-- --
-- 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 --
------------------------------------------------------------------------------
with Ada.Strings.Unbounded;
with Ada.Exceptions;
with Ada_GUI.Gnoga.Server.Connection;
package body Ada_GUI.Gnoga.Gui.Element.Canvas is
--------------
-- Finalize --
--------------
overriding
procedure Finalize (Object : in out Context_Type) is
begin
Gnoga.Server.Connection.Execute_Script
(Object.Connection_ID, "delete gnoga['" &
Ada.Strings.Unbounded.To_String (Object.Context_ID) &
"'];");
exception
when E : Gnoga.Server.Connection.Connection_Error =>
Log ("Connection" & Object.Connection_ID'Img &
" error during delete object " &
Ada.Strings.Unbounded.To_String (Object.Context_ID));
Log (Ada.Exceptions.Exception_Information (E));
end Finalize;
------------
-- Create --
------------
procedure Create (Canvas : in out Canvas_Type;
Parent : in out Gnoga.Gui.Base_Type'Class;
Width : in Integer;
Height : in Integer;
ID : in String := "")
is
begin
Canvas.Create_From_HTML (Parent, "<canvas width=" & Width'Img &
" height =" & Height'Img & ">", ID);
end Create;
-------------------
-- Connection_ID --
-------------------
function Connection_ID (Context : Context_Type)
return Gnoga.Connection_ID
is
begin
return Context.Connection_ID;
end Connection_ID;
--------
-- ID --
--------
function ID (Context : Context_Type) return String is
use Ada.Strings.Unbounded;
begin
return To_String (Context.Context_ID);
end ID;
--------------
-- Property --
--------------
procedure Property (Context : in out Context_Type;
Name : in String;
Value : in String)
is
begin
Context.Execute (Name & "='" & Escape_Quotes (Value) & "';");
end Property;
procedure Property (Context : in out Context_Type;
Name : in String;
Value : in Integer)
is
begin
Context.Execute (Name & "=" & Value'Img & ";");
end Property;
procedure Property (Context : in out Context_Type;
Name : in String;
Value : in Boolean)
is
begin
Context.Execute (Name & "=" & Value'Img & ";");
end Property;
procedure Property (Context : in out Context_Type;
Name : in String;
Value : in Float) is
begin
Context.Execute (Name & "=" & Value'Img & ";");
end Property;
function Property (Context : Context_Type; Name : String) return String
is
begin
return Context.Execute (Name);
end Property;
function Property (Context : Context_Type; Name : String) return Integer
is
begin
return Integer'Value (Context.Property (Name));
exception
when E : others =>
Log ("Error Property converting to Integer (forced to 0).");
Log (Ada.Exceptions.Exception_Information (E));
return 0;
end Property;
function Property (Context : Context_Type; Name : String) return Boolean
is
begin
return Boolean'Value (Context.Property (Name));
exception
when E : others =>
Log ("Error Property converting to Boolean (forced to False).");
Log (Ada.Exceptions.Exception_Information (E));
return False;
end Property;
function Property (Context : Context_Type; Name : String) return Float is
begin
return Float'Value (Context.Property (Name));
exception
when E : others =>
Log ("Error Property converting to Float (forced to 0.0).");
Log (Ada.Exceptions.Exception_Information (E));
return 0.0;
end Property;
-------------
-- Execute --
-------------
procedure Execute (Context : in out Context_Type; Method : String) is
begin
Gnoga.Server.Connection.Execute_Script
(ID => Context.Connection_ID,
Script => "gnoga['" & Context.ID & "']." & Method);
end Execute;
function Execute (Context : Context_Type; Method : String)
return String
is
begin
return Gnoga.Server.Connection.Execute_Script
(ID => Context.Connection_ID,
Script => "gnoga['" & Context.ID & "']." & Method);
end Execute;
end Ada_GUI.Gnoga.Gui.Element.Canvas;