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------------------------------------------------------------------------------
-- GtkAda - Ada95 binding for the Gimp Toolkit --
-- --
-- Copyright (C) 1998-2018, 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 Unchecked_Conversion;
with Cairo; use Cairo;
with Glib; use Glib;
with Gdk; use Gdk;
with Gdk.Cursor; use Gdk.Cursor;
with Gdk.Device_Manager; use Gdk.Device_Manager;
with Gdk.Display;
with Gdk.Event; use Gdk.Event;
with Gdk.Window; use Gdk.Window;
with Gtk.Adjustment; use Gtk.Adjustment;
with Gtk.Box; use Gtk.Box;
with Gtk.Drawing_Area; use Gtk.Drawing_Area;
with Gtk.Enums; use Gtk.Enums;
with Gtk.Label; use Gtk.Label;
with Gtk.Handlers; use Gtk.Handlers;
with Gtk.Spin_Button; use Gtk.Spin_Button;
with Gtk.Widget; use Gtk.Widget;
with Gtk; use Gtk;
with Ada.Text_IO; use Ada.Text_IO;
package body Create_Cursors is
type My_Spin_Button_Record is new Gtk_Spin_Button_Record with record
Label : Gtk_Label;
end record;
type My_Spin_Button is access all My_Spin_Button_Record;
package Spin2_Cb is new Handlers.User_Callback
(My_Spin_Button_Record, Gtk_Drawing_Area);
package Spin3_Cb is new Handlers.User_Return_Callback
(Gtk_Widget_Record, Gint, My_Spin_Button);
package Da_Cb is new Handlers.Return_Callback
(Gtk_Drawing_Area_Record, Boolean);
----------
-- Help --
----------
function Help return String is
begin
return "Multiple kind of cursors can be used in your application. Even"
& " though you can define your own pixmaps for cursors, a number of"
& " cursors are predefined."
& ASCII.LF
& "This demo also shows a basic example on how to draw into a"
& " @bGtk_Drawing_Area@B.";
end Help;
-------------
-- On_Draw --
-------------
function On_Draw
(Darea : access Gtk_Drawing_Area_Record'Class;
Cr : Cairo_Context) return Boolean
is
W : constant Gdouble := Gdouble (Get_Allocated_Width (Darea));
H : constant Gdouble := Gdouble (Get_Allocated_Height (Darea));
begin
Rectangle (Cr, 0.0, 0.0, W, H / 2.0);
Set_Source_Rgb (Cr, 1.0, 1.0, 1.0);
Cairo.Fill (Cr);
Rectangle (Cr, 0.0, H / 2.0, W, H / 2.0);
Set_Source_Rgb (Cr, 0.0, 0.0, 0.0);
Cairo.Fill (Cr);
Rectangle (Cr, W / 3.0, H / 3.0, W / 3.0, H / 3.0);
Set_Source_Rgb (Cr, 0.5, 0.5, 0.5);
Cairo.Fill (Cr);
return False;
end On_Draw;
----------------
-- Set_Cursor --
----------------
procedure Set_Cursor (Spinner : access My_Spin_Button_Record'Class;
Widget : Gtk_Drawing_Area)
is
pragma Warnings (Off);
function To_Cursor is new Unchecked_Conversion
(Gint, Gdk_Cursor_Type);
pragma Warnings (On);
C : Gint := Get_Value_As_Int (Spinner);
Window : constant Gdk_Window := Get_Window (Widget);
Cursor : Gdk_Cursor := null;
Device_Manager : constant Gdk_Device_Manager :=
Get_Device_Manager (Gdk.Display.Get_Default);
begin
C := C mod 154;
Gdk_New (Cursor, To_Cursor (C));
Set_Text (Spinner.Label, Gdk_Cursor_Type'Image (To_Cursor (C)));
Set_Device_Cursor (Self => Window,
Device => Device_Manager.Get_Client_Pointer,
Cursor => Cursor);
-- The cursor change is asynchronous: if you plan to do a blocking
-- operation right after setting this, it is useful to call
-- Process_All_Updates in order for impacted windows to have the new
-- cursor.
Process_All_Updates;
-- Note: the cursor pixmap is copied to the server, which keeps it as
-- long at it needs. On the client side, it is possible to delete the
-- cursor right now.
Unref (Cursor);
end Set_Cursor;
------------------
-- Cursor_Event --
------------------
function Cursor_Event
(Darea : access Gtk_Widget_Record'Class;
Event : Gdk_Event;
Spinner : My_Spin_Button) return Gint
is
pragma Warnings (Off, Darea);
begin
if Get_Button (Event) = 1 then
Spin
(Spinner, Spin_Step_Forward,
Get_Step_Increment (Get_Adjustment (Spinner)));
elsif Get_Button (Event) = 3 then
Spin
(Spinner, Spin_Step_Backward,
Get_Step_Increment (Get_Adjustment (Spinner)));
else
Put_Line ("Unknown button : " & Guint'Image (Get_Button (Event)));
end if;
return 0;
end Cursor_Event;
---------
-- Run --
---------
procedure Run (Frame : access Gtk.Frame.Gtk_Frame_Record'Class) is
Vbox,
Hbox : Gtk_Box;
Label : Gtk_Label;
Adj : Gtk_Adjustment;
Spinner : My_Spin_Button;
Frame2 : Gtk_Frame;
Darea : Gtk_Drawing_Area;
begin
Set_Label (Frame, "Cursors");
Gtk_New_Vbox (Vbox, False, 5);
Set_Border_Width (Vbox, 10);
Add (Frame, Vbox);
Gtk_New_Hbox (Hbox, False, 0);
Set_Border_Width (Hbox, 5);
Pack_Start (Vbox, Hbox, False, False, 0);
Gtk_New (Label, "Cursor Value:");
Set_Alignment (Label, 0.0, 0.5);
Pack_Start (Hbox, Label, False, True, 0);
Gtk_New (Adj, 0.0, 0.0, 152.0, 2.0, 10.0, 0.0);
Spinner := new My_Spin_Button_Record;
Initialize (Spinner, Adj, 0.0, 0);
Pack_Start (Hbox, Spinner, True, True, 0);
Gtk_New (Frame2, "Cursor Area");
Set_Shadow_Type (Frame2, Shadow_Etched_In);
Set_Label_Align (Frame2, 0.5, 0.0);
Set_Border_Width (Frame2, 10);
Pack_Start (Vbox, Frame2);
Gtk_New (Darea);
Set_Size_Request (Darea, 80, 80);
Add (Frame2, Darea);
Da_Cb.Connect (Darea, Signal_Draw, Da_Cb.To_Marshaller (On_Draw'Access));
Unrealize (Darea); -- Required for the call to Set_Events
Set_Events (Darea, Exposure_Mask or Button_Press_Mask);
Spin3_Cb.Connect (Darea, "button_press_event",
Spin3_Cb.To_Marshaller (Cursor_Event'Access), Spinner);
Spin2_Cb.Connect (Spinner, "changed", Set_Cursor'Access, Darea);
Gtk_New (Spinner.Label, "XXX");
Pack_Start (Vbox, Spinner.Label, False, False, 0);
Show_All (Frame);
end Run;
end Create_Cursors;
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