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370 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Gtk.Layered.Waveform.Sweeper Luebeck --
-- Implementation Spring, 2011 --
-- --
-- Last revision : 13:15 14 Sep 2019 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, 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. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- 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. --
--____________________________________________________________________--
with Interfaces.C.Strings;
package body Gtk.Layered.Waveform.Sweeper is
Max_Page : constant Duration :=
(Duration'Last - Duration'First) / 10.0;
Min_Page : constant Duration := Duration'Small * 10.0;
Def_Page : constant Duration := 20.0;
Class_Record : Ada_GObject_Class := Uninitialized_Class;
Signal_Names : constant Interfaces.C.Strings.Chars_Ptr_Array :=
( 0 => Interfaces.C.Strings.New_String ("freezing-changed"),
1 => Interfaces.C.Strings.New_String ("offset-changed")
);
Freezing_Changed_ID : Signal_ID := Invalid_Signal_Id;
procedure EmitV
( Params : System.Address;
Signal : Signal_ID;
Quark : GQuark;
Result : System.Address
);
pragma Import (C, EmitV, "g_signal_emitv");
procedure Emit
( Sweeper : not null access
Gtk_Waveform_Sweeper_Record'Class;
Signal : Signal_ID
) is
procedure Set_Object
( Value : in out GValue;
Object : System.Address
);
pragma Import (C, Set_Object, "g_value_set_object");
Params : GValue_Array (0..0);
Result : GValue;
begin
if Class_Record /= Uninitialized_Class then
declare
This : constant GType := Get_Type;
begin
Init (Params (0), This);
Set_Object (Params (0), Sweeper);
EmitV (Params (0)'Address, Signal, 0, Result'Address);
Unset (Params (0));
end;
end if;
end Emit;
function Get_Frozen
( Sweeper : not null access constant
Gtk_Waveform_Sweeper_Record
) return Boolean is
begin
return Sweeper.Frozen;
end Get_Frozen;
function Get_From
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Time is
begin
return To_Time (Get_Lower (Sweeper));
end Get_From;
function Get_From
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Ada.Calendar.Time is
begin
return To_Time (Get_Lower (Sweeper));
end Get_From;
function Get_Offset
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Duration is
begin
return
Duration
( Sweeper.Get_Upper
- Sweeper.Get_Value
- Sweeper.Get_Page_Size
);
end Get_Offset;
function Get_Time
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Time is
begin
return To_Time
( GDouble
( Get_Value (Sweeper)
+ Sweeper.Get_Page_Size
) );
end Get_Time;
function Get_Time
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Ada.Calendar.Time is
begin
return To_Time
( GDouble
( Get_Value (Sweeper)
+ Sweeper.Get_Page_Size
) );
end Get_Time;
function Get_To
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Time is
begin
return To_Time (Sweeper.Get_Upper);
end Get_To;
function Get_To
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Ada.Calendar.Time is
begin
return To_Time (Sweeper.Get_Upper);
end Get_To;
function Get_Type return GType is
begin
Initialize_Class_Record
( Ancestor => Gtk.Adjustment.Get_Type,
Signals => Signal_Names,
Class_Record => Class_Record,
Type_Name => Class_Name,
Parameters => ( 0 => (0 => GType_None),
1 => (0 => GType_None)
) );
return Class_Record.The_Type;
end Get_Type;
procedure Gtk_New (Sweeper : out Gtk_Waveform_Sweeper) is
begin
Sweeper := new Gtk_Waveform_Sweeper_Record;
Gtk.Layered.Waveform.Sweeper.Initialize (Sweeper);
end Gtk_New;
procedure Initialize
( Sweeper : not null access
Gtk_Waveform_Sweeper_Record'Class
) is
To : constant GDouble := To_Double (Clock);
begin
G_New (Sweeper, Get_Type);
Gtk.Adjustment.Initialize
( Adjustment => Sweeper,
Value => To - GDouble (Def_Page),
Lower => To - GDouble (Def_Page),
Upper => To,
Step_Increment => GDouble (Def_Page) / 10.0,
Page_Increment => GDouble (Def_Page) / 3.0,
Page_Size => GDouble (Def_Page)
);
--***
-- This is a bug in GTK, which manifests itself as not setting all
-- adjustment parameters upon Inilialize (gtk_adjustment_new). The
-- workaround is to call Configure yet again in order to force the
-- parameters. Normally Configure would be not necessary
--
Sweeper.Configure
( Value => To - GDouble (Def_Page),
Lower => To - GDouble (Def_Page),
Upper => To,
Step_Increment => GDouble (Def_Page) / 10.0,
Page_Increment => GDouble (Def_Page) / 3.0,
Page_Size => GDouble (Def_Page)
);
if Freezing_Changed_ID = Invalid_Signal_Id then
declare
Widget_Type : constant GType := Get_Type (Sweeper);
begin
Freezing_Changed_ID :=
Lookup (Widget_Type, "freezing-changed");
end;
end if;
end Initialize;
function Get_Page_Span
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Duration is
begin
return Duration (Sweeper.Get_Page_Size);
end Get_Page_Span;
procedure Set
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Date : Time;
From : Time;
To : Time;
Step_Increment : Duration;
Page_Increment : Duration;
Page_Span : Duration
) is
begin
Sweeper.Configure
( Value => To_Double (Date) - GDouble (Page_Span),
Lower => To_Double (From),
Upper => To_Double (To),
Page_Size => GDouble (Page_Span),
Step_Increment => GDouble (Step_Increment),
Page_Increment => GDouble (Page_Increment)
);
end Set;
procedure Set
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Date : Ada.Calendar.Time;
From : Ada.Calendar.Time;
To : Ada.Calendar.Time;
Step_Increment : Duration;
Page_Increment : Duration;
Page_Span : Duration
) is
begin
Sweeper.Configure
( Value => To_Double (Date) - GDouble (Page_Span),
Lower => To_Double (From),
Upper => To_Double (To),
Page_Size => GDouble (Page_Span),
Step_Increment => GDouble (Step_Increment),
Page_Increment => GDouble (Page_Increment)
);
end Set;
procedure Set_Current_Time
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Stamp : Time;
Active : Boolean := False
) is
Value : constant GDouble := To_Double (Stamp);
Upper : constant GDouble := Sweeper.Get_Upper;
Lower : constant GDouble := Sweeper.Get_Lower;
begin
if Active then
Sweeper.Active := Sweeper.Active + 1;
end if;
if Sweeper.Frozen then
if Lower > Value then
Sweeper.Set_Lower (Value);
end if;
if Upper < Value then
Sweeper.Set_Upper (Value);
end if;
else
if Lower > Value then
Sweeper.Set_Lower (Value);
end if;
if Upper < Value then
Sweeper.Set_Upper (Value);
Set_Value (Sweeper, Value - Upper + Sweeper.Get_Value);
end if;
end if;
if Active then
Sweeper.Active := Sweeper.Active - 1;
end if;
end Set_Current_Time;
function Is_Active
( Sweeper : not null access Gtk_Waveform_Sweeper_Record
) return Boolean is
begin
return Sweeper.Active > 0;
end Is_Active;
procedure Set_Frozen
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Frozen : Boolean
) is
begin
if Sweeper.Frozen /= Frozen then
Sweeper.Frozen := Frozen;
Emit (Sweeper, Freezing_Changed_ID);
end if;
end Set_Frozen;
procedure Set_Page_Span
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Page_Span : Duration
) is
Upper : GDouble := Sweeper.Get_Upper;
Lower : GDouble := Sweeper.Get_Lower;
Value : GDouble := Sweeper.Get_Value + Sweeper.Get_Page_Size;
Page : GDouble;
begin
if Page_Span < Min_Page then
Page := GDouble (Min_Page);
elsif Page_Span > Max_Page then
Page := GDouble (Max_Page);
else
Page := GDouble (Page_Span);
end if;
Value := Value - Page;
if Value < Lower then
Lower := Value;
end if;
if Value > Upper then
Upper := Value;
end if;
Sweeper.Configure
( Value => Value,
Lower => Lower,
Upper => Upper,
Page_Size => Page,
Step_Increment => Sweeper.Get_Step_Increment,
Page_Increment => Sweeper.Get_Page_Increment
);
end Set_Page_Span;
procedure Set_Time
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Stamp : Time
) is
begin
Sweeper.Set_Time (To_Double (Stamp));
end Set_Time;
procedure Set_Time
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Stamp : Ada.Calendar.Time
) is
begin
Sweeper.Set_Time (To_Double (Stamp));
end Set_Time;
procedure Set_Time
( Sweeper : not null access Gtk_Waveform_Sweeper_Record;
Stamp : GDouble
) is
Upper : constant GDouble := Sweeper.Get_Upper;
Lower : constant GDouble := Sweeper.Get_Lower;
Page : constant GDouble := Sweeper.Get_Page_Size;
begin
if Stamp > Upper then
Sweeper.Set_Value (Upper - Page);
elsif Stamp < Lower + Page then
Sweeper.Set_Value (Lower);
else
Sweeper.Set_Value (Stamp - Page);
end if;
end Set_Time;
end Gtk.Layered.Waveform.Sweeper;
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