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-----------------------------------------------------------------------
-- GtkAda - Ada95 binding for the Gimp Toolkit --
-- --
-- Copyright (C) 2006 AdaCore --
-- --
-- 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 Glib; use Glib;
with Glib.Object; use Glib.Object;
with Glib.Values; use Glib.Values;
with Gtk; use Gtk;
with Gtk.Enums; use Gtk.Enums;
with Gtk.Scrolled_Window; use Gtk.Scrolled_Window;
with Gtk.Cell_Renderer_Text; use Gtk.Cell_Renderer_Text;
with Gtk.List_Store; use Gtk.List_Store;
with Gtk.Tree_View; use Gtk.Tree_View;
with Gtk.Tree_Model; use Gtk.Tree_Model;
with Gtk.Tree_Model_Filter; use Gtk.Tree_Model_Filter;
with Gtk.Tree_View_Column; use Gtk.Tree_View_Column;
with Gtk.Frame; use Gtk.Frame;
package body Create_Tree_Filter is
Column_0 : constant := 0;
function Custom_Filter
(Model : access Gtk_Tree_Model_Record'Class;
Iter : Gtk_Tree_Iter) return Boolean;
-- Decide whether a row should be made visible or not
procedure Custom_Appearance
(Model : access Gtk_Tree_Model_Filter_Record'Class;
Iter : Gtk_Tree_Iter;
Value : out GValue;
Column : Gint);
-- Change the appearance of the view dynamically
----------
-- Help --
----------
function Help return String is
begin
return "This example demonstrates a special tree modeL: it wraps another"
& " model, and can be used to filter out lines, or even modify its"
& " appearance on the fly." & ASCII.LF
& "In this example, we have creates a model that contains the sequence"
& " 1, 2, ... 9. Another model is applied on top of it, and filters"
& " all odd numbers rows. It also changes the appearance to display"
& " some extra text." & ASCII.LF
& "The underlying model itself is never modified, and by changing a"
& " few properties we can decide to show the whole underlying model"
& " itself." & ASCII.LF
& "Modifying the appearance on the fly is not efficient. It is"
& " generally better to use the functions from @bGtk_Cell_Layout@B to"
& " create ""virtual"" columns in the model. See the Cell View demo.";
end Help;
-------------------
-- Custom_Filter --
-------------------
function Custom_Filter
(Model : access Gtk_Tree_Model_Record'Class;
Iter : Gtk_Tree_Iter) return Boolean
is
Value : constant Gint := Get_Int (Model, Iter, Column_0);
begin
return Value mod 2 /=1 ;
end Custom_Filter;
-----------------------
-- Custom_Appearance --
-----------------------
procedure Custom_Appearance
(Model : access Gtk_Tree_Model_Filter_Record'Class;
Iter : Gtk_Tree_Iter;
Value : out GValue;
Column : Gint)
is
Val : Gint;
Child_Iter : Gtk_Tree_Iter;
begin
Convert_Iter_To_Child_Iter (Model, Child_Iter, Iter);
Val := Get_Int (Get_Model (Model), Child_Iter, Column);
Set_String (Value, "This is line" & Gint'Image (Val));
end Custom_Appearance;
---------
-- Run --
---------
procedure Run (Frame : access Gtk.Frame.Gtk_Frame_Record'Class) is
Model : Gtk_List_Store;
Filter : Gtk_Tree_Model_Filter;
Tree : Gtk_Tree_View;
Scrolled : Gtk_Scrolled_Window;
Col : Gtk_Tree_View_Column;
Num : Gint;
Text : Gtk_Cell_Renderer_Text;
Iter : Gtk_Tree_Iter;
pragma Unreferenced (Num);
begin
Set_Label (Frame, "Tree Model Filter");
Gtk_New (Scrolled);
Add (Frame, Scrolled);
Set_Policy (Scrolled, Policy_Automatic, Policy_Automatic);
-- Create the model that contains the actual data. This model will
-- never be modified
Gtk_New (Model, (Column_0 => GType_Int));
for N in 1 .. 10 loop
Append (Model, Iter);
Set (Model, Iter, Column_0, Gint (N));
end loop;
-- Now creates a filter around this model. We filter through a custom
-- function, but that could be a simple row in the model as well. The
-- function is slightly more flexible, though.
Gtk_New (Filter, Model);
Set_Visible_Func (Filter, Custom_Filter'Access);
Set_Modify_Func (Filter, (0 => GType_String), Custom_Appearance'Access);
-- And now a view that displays the filter. A single column is displayed
Gtk_New (Tree, Filter);
Add (Scrolled, Tree);
Set_Headers_Visible (Tree, False);
Gtk_New (Text);
Gtk_New (Col);
Num := Append_Column (Tree, Col);
Pack_Start (Col, Text, True);
Add_Attribute (Col, Text, "text", Column_0);
Show_All (Frame);
end Run;
end Create_Tree_Filter;
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