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------------------------------------------------------------------------------
-- GtkAda - Ada95 binding for the Gimp Toolkit --
-- --
-- Copyright (C) 2014-2018, 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 Ada.Numerics; use Ada.Numerics;
with Cairo; use Cairo;
with Gdk.Event; use Gdk.Event;
with Glib; use Glib;
with Glib.Object; use Glib.Object;
with Gtk.Box; use Gtk.Box;
with Gtk.Drawing_Area; use Gtk.Drawing_Area;
with Gtk.Enums; use Gtk.Enums;
with Gtk.Frame; use Gtk.Frame;
with Gtk.Label; use Gtk.Label;
with Gtk.Widget; use Gtk.Widget;
with Gtk.Gesture; use Gtk.Gesture;
with Gtk.Gesture_Long_Press; use Gtk.Gesture_Long_Press;
with Gtk.Gesture_Zoom; use Gtk.Gesture_Zoom;
package body Create_Gestures is
type My_Drawing_Area_Record is new Gtk_Drawing_Area_Record with record
Long_Press_X : Gdouble := Gdouble'First;
Long_Press_Y : Gdouble := Gdouble'First;
Zoom_Scale : Gdouble := 1.0;
end record;
type My_Drawing_Area is access all My_Drawing_Area_Record'Class;
procedure On_Long_Press
(Area : access GObject_Record'Class;
X, Y : Gdouble);
procedure On_Long_Press_End
(Area : access GObject_Record'Class;
Sequence : Gdk_Event_Sequence);
procedure On_Scale_Changed
(Area : access GObject_Record'Class;
Scale : Gdouble);
function On_Draw
(Area : access Gtk_Widget_Record'Class;
Cr : Cairo.Cairo_Context) return Boolean;
----------
-- Help --
----------
function Help return String is
begin
return "";
end Help;
----------------------
-- On_Scale_Changed --
----------------------
procedure On_Scale_Changed
(Area : access GObject_Record'Class;
Scale : Gdouble)
is
A : constant My_Drawing_Area := My_Drawing_Area (Area);
begin
A.Zoom_Scale := Scale;
A.Queue_Draw;
end On_Scale_Changed;
-------------------
-- On_Long_Press --
-------------------
procedure On_Long_Press
(Area : access GObject_Record'Class;
X, Y : Gdouble)
is
A : constant My_Drawing_Area := My_Drawing_Area (Area);
begin
A.Long_Press_X := X;
A.Long_Press_Y := Y;
A.Queue_Draw;
end On_Long_Press;
-----------------------
-- On_Long_Press_End --
-----------------------
procedure On_Long_Press_End
(Area : access GObject_Record'Class;
Sequence : Gdk_Event_Sequence)
is
pragma Unreferenced (Sequence);
A : constant My_Drawing_Area := My_Drawing_Area (Area);
begin
A.Long_Press_X := Gdouble'First;
A.Queue_Draw;
end On_Long_Press_End;
-------------
-- On_Draw --
-------------
function On_Draw
(Area : access Gtk_Widget_Record'Class;
Cr : Cairo.Cairo_Context) return Boolean
is
A : constant My_Drawing_Area := My_Drawing_Area (Area);
Alloc : Gtk_Allocation;
begin
Area.Get_Allocation (Alloc);
Cairo.Scale (Cr, A.Zoom_Scale, A.Zoom_Scale);
Cairo.Save (Cr);
Cairo.Rectangle
(Cr, 5.0, 5.0, Gdouble (Alloc.Width) - 10.0,
Gdouble (Alloc.Height) - 10.0);
Cairo.Set_Source_Rgba (Cr, 1.0, 0.0, 0.0, 0.8);
Cairo.Set_Line_Width (Cr, 2.0);
Cairo.Stroke (Cr);
Cairo.Restore (Cr);
Cairo.Save (Cr);
Cairo.Rectangle (Cr, 50.0, 50.0, 50.0, 50.0);
Cairo.Set_Source_Rgba (Cr, 1.0, 0.0, 0.0, 0.8);
Cairo.Stroke (Cr);
Cairo.Restore (Cr);
if A.Long_Press_X /= Gdouble'First then
Cairo.Save (Cr);
Cairo.Arc
(Cr, A.Long_Press_X, A.Long_Press_Y,
Radius => 20.0, Angle1 => 0.0, Angle2 => 2.0 * Pi);
Cairo.Set_Source_Rgba (Cr, 0.0, 0.0, 1.0, 0.8);
Cairo.Stroke (Cr);
Cairo.Restore (Cr);
end if;
return True;
end On_Draw;
---------
-- Run --
---------
procedure Run (Frame : access Gtk.Frame.Gtk_Frame_Record'Class) is
Area : My_Drawing_Area;
Box : Gtk_Box;
Label : Gtk_Label;
begin
Frame.Set_Label ("Gestures");
Gtk_New_Vbox (Box, Homogeneous => False);
Frame.Add (Box);
Gtk_New
(Label,
"Try various gestures below: long press and zoom (on some hardware)");
Box.Pack_Start (Label, Expand => False, Fill => True);
Area := new My_Drawing_Area_Record;
Gtk.Drawing_Area.Initialize (Area);
Box.Pack_Start (Area, Expand => True, Fill => True);
Area.On_Draw (On_Draw'Access);
declare
G : Gtk_Gesture_Long_Press;
begin
Gtk_New (G, Area);
G.On_Pressed (On_Long_Press'Access, Area);
G.On_End (On_Long_Press_End'Access, Area);
G.Set_Propagation_Phase (Phase_Bubble);
-- Weak_Ref (Area, Glib.Object.Unref, G);
end;
declare
G : Gtk_Gesture_Zoom;
begin
Gtk_New (G, Area);
G.On_Scale_Changed (On_Scale_Changed'Access, Area);
G.Set_Propagation_Phase (Phase_Bubble);
end;
Frame.Show_All;
end Run;
end Create_Gestures;
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