1Gtk2::CellLayout(3)   User Contributed Perl Documentation  Gtk2::CellLayout(3)
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NAME

6       Gtk2::CellLayout - wrapper for GtkCellLayout
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SYNOPSIS

9        # This is an abstract interface; the CellLayout interface is
10        # implemented by concrete classes like ComboBox and TreeViewColumn.
11        # See the discussion for details on creating your own CellLayout.
12        # This synopsis assumes you already have an instance in $cell_layout.
13
14        # Add a cell renderer that shows the pixbuf in column 2 of the
15        # associated TreeModel.  It will take up only the necessary space
16        # ("expand" => FALSE).
17        my $cell = Gtk2::CellRendererPixbuf->new ();
18        $cell_layout->pack_start ($cell, FALSE);
19        $cell_layout->add_attribute ($cell, pixbuf => 2);
20
21        # Add another cell renderer that gets the "text" property from
22        # column 3 of the associated TreeModel, and takes up all remaining
23        # horizontal space ("expand" => TRUE).
24        my $cell = Gtk2::CellRendererText->new ();
25        $cell_layout->pack_start ($cell, TRUE);
26        $cell_layout->add_attribute ($cell, text => 3);
27

DESCRIPTION

29       Gtk2::CellLayout is an interface to be implemented by all objects which
30       want to provide a Gtk2::TreeViewColumn-like API for packing cells,
31       setting attributes and data funcs.
32

HIERARCHY

34         Glib::Interface
35         +----Gtk2::CellLayout
36

METHODS

38   $cell_layout->add_attribute ($cell, $attribute, $column)
39       ·   $cell (Gtk2::CellRenderer)
40
41       ·   $attribute (string)
42
43       ·   $column (integer)
44
45       Adds an attribute mapping to the list in $cell_layout.  The $column is
46       the column of the model from which to get a value, and the $attribute
47       is the property of $cell to be set from the value.  So, for example, if
48       column 2 of the model contains strings, you could have the "text"
49       attribute of a Gtk2::CellRendererText get its values from column 2.
50
51   $cell_layout->set_attributes ($cell, ...)
52       ·   $cell (Gtk2::CellRenderer)
53
54       ·   ... (list) list of property name and column number pairs.
55
56       Sets the pairs in the ... list as the attributes of $cell_layout, as
57       with repeated calls to "add_attribute".  All existing attributes are
58       removed, and replaced with the new attributes.
59
60   $cell_layout->set_cell_data_func ($cell, $func, $func_data=undef)
61       ·   $cell (Gtk2::CellRenderer)
62
63       ·   $func (scalar)
64
65       ·   $func_data (scalar)
66
67       Sets up $cell_layout to call $func to set up attributes of $cell,
68       instead of the standard attribute mapping.  $func may be undef to
69       remove an older callback.  $func will receive these parameters:
70
71       $cell_layout  The cell layout instance
72       $cell         The cell renderer to set up
73       $model        The tree model
74       $iter         TreeIter of the row for which to set the values
75       $data         The $func_data passed to "set_cell_data_func"
76
77   list = $cell_layout->get_cells
78       Fetch all of the cell renderers which have been added to $cell_layout.
79
80       Note that if there are no cells this functions returns 'undef' instead
81       of an empty list.
82
83       Since: gtk+ 2.12
84
85   $cell_layout->clear
86       Unsets all the mappings on all renderers on $cell_layout and removes
87       all renderers attached to it.
88
89   $cell_layout->clear_attributes ($cell)
90       ·   $cell (Gtk2::CellRenderer)
91
92       Clears all existing attributes previously set with for $cell with
93       "add_attribute" or "set_attributes".
94
95   $cell_layout->pack_end ($cell, $expand)
96       ·   $cell (Gtk2::CellRenderer)
97
98       ·   $expand (boolean)
99
100       Like "pack_start", but adds from the end of the layout instead of the
101       beginning.
102
103   $cell_layout->pack_start ($cell, $expand)
104       ·   $cell (Gtk2::CellRenderer)
105
106       ·   $expand (boolean)
107
108       Packs $cell into the beginning of $cell_layout.  If $expand is false,
109       then $cell is allocated no more space than it needs.  Any unused space
110       is divided evenly between cells for which $expand is true.
111
112   $cell_layout->reorder ($cell, $position)
113       ·   $cell (Gtk2::CellRenderer)
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115       ·   $position (integer)
116
117       Re-insert $cell at $position.  $cell must already be packed into
118       $cell_layout.
119

CREATING A CUSTOM CELL LAYOUT

121       GTK+ provides several CellLayout implementations, such as
122       Gtk2::TreeViewColumn and Gtk2::ComboBox.  To create your own object
123       that implements the CellLayout interface and therefore can be used to
124       display CellRenderers, you need to add Gtk2::CellLayout to your class's
125       "interfaces" list, like this:
126
127         package MyLayout;
128         use Gtk2;
129         use Glib::Object::Subclass
130             Gtk2::Widget::,
131             interfaces => [ Gtk2::CellLayout:: ],
132             ;
133
134       This will cause perl to call several virtual methods with
135       ALL_CAPS_NAMES when GTK+ attempts to perform certain actions.  You
136       simply provide (or override) those methods with perl code.  The methods
137       map rather directly to the object interface, so it should be easy to
138       figure out what they should do.  Those methods are:
139
140       PACK_START ($cell_layout, $cell, $expand)
141       PACK_END ($cell_layout, $cell, $expand)
142       CLEAR ($cell_layout)
143       ADD_ATTRIBUTE ($cell_layout, $cell, $attribute, $column)
144       SET_CELL_DATA_FUNC ($cell_layout, $cell, $func, $data)
145       CLEAR_ATTRIBUTES ($cell_layout, $cell)
146       REORDER ($cell_layout, $cell, $position)
147       list = GET_CELLS ($cell_layout)
148

SEE ALSO

150       Gtk2, Glib::Interface
151
153       Copyright (C) 2003-2011 by the gtk2-perl team.
154
155       This software is licensed under the LGPL.  See Gtk2 for a full notice.
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159perl v5.30.1                      2020-01-30               Gtk2::CellLayout(3)
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