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------------------------------------------------------------------------------
-- GtkAda - Ada95 binding for Gtk+/Gnome --
-- --
-- Copyright (C) 2010-2018, AdaCore --
-- --
-- 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 MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- 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/>. --
-- --
------------------------------------------------------------------------------
with Glib; use Glib;
with Gtk.Adjustment; use Gtk.Adjustment;
with Gtk.Box; use Gtk.Box;
with Gtk.Label; use Gtk.Label;
with Gtk.Scale; use Gtk.Scale;
with Gtk.Widget; use Gtk.Widget;
with Gtk.Window; use Gtk.Window;
with Common; use Common;
package body Create_Opacity is
Main_Window : Gtk_Window;
-- The main testgtk window.
----------
-- Help --
----------
function Help return String is
begin
return "This demo makes the main window partially"
& " transparent, with opacity 0 being fully transparent and 1 fully"
& " opaque. On X11 this has effect only on X screens with a"
& " compositing manager running. On Windows it should always work."
& " Note that setting a window's opacity after the window has been"
& " shown causes it to flicker once on Windows.";
end Help;
----------------------
-- On_Value_Changed --
----------------------
procedure On_Value_Changed
(Adjustment : access Gtk_Adjustment_Record'Class)
is
begin
Main_Window.Set_Opacity (Get_Value (Adjustment) / 100.0);
end On_Value_Changed;
---------
-- Run --
---------
procedure Run (Frame : access Gtk.Frame.Gtk_Frame_Record'Class) is
Box1, Box2 : Gtk_Box;
Label : Gtk_Label;
Adjustment : Gtk_Adjustment;
Scale : Gtk_Scale;
begin
-- Record our toplevel widget for use by our callbacks.
Main_Window := Gtk_Window (Get_Toplevel (Frame));
Set_Label (Frame, "Opacity");
Gtk_New_Vbox (Box1, False, 0);
Add (Frame, Box1);
Gtk_New_Vbox (Box2, False, 10);
Set_Border_Width (Box2, 10);
Pack_Start (Box1, Box2, False, False, 0);
if Is_Composited (Main_Window) then
Gtk_New (Label, "The main window IS composited.");
else
Gtk_New
(Label, "The main window IS NOT composited. This might not work.");
end if;
Pack_Start (Box2, Label, False, False, 10);
Gtk_New (Label, "Opacity setting for the main window:");
Pack_Start (Box2, Label, False, False, 0);
Gtk_New
(Adjustment,
Value => Get_Opacity (Main_Window) * 100.0,
Lower => 0.0,
Upper => 100.0,
Step_Increment => 0.1,
Page_Increment => 5.0);
Gtk_New_Hscale (Scale, Adjustment);
Pack_Start (Box2, Scale, True, True, 0);
Adj_Handler.Connect
(Adjustment, "value_changed", On_Value_Changed'Access);
Show_All (Frame);
end Run;
end Create_Opacity;
|
