## GtkCellLayout

GtkCellLayout — An interface for packing cells

## Synopsis

    #include <gtk/gtk.h>

    struct      GtkCellLayout;
    struct      GtkCellLayoutIface;
    void        (*GtkCellLayoutDataFunc)        (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 GtkTreeModel *tree_model,
                                                 GtkTreeIter *iter,
                                                 gpointer data);
    void        gtk_cell_layout_pack_start      (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 gboolean expand);
    void        gtk_cell_layout_pack_end        (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 gboolean expand);
    void        gtk_cell_layout_reorder         (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 gint position);
    void        gtk_cell_layout_clear           (GtkCellLayout *cell_layout);
    void        gtk_cell_layout_set_attributes  (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 ...);
    void        gtk_cell_layout_add_attribute   (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 const gchar *attribute,
                                                 gint column);
    void        gtk_cell_layout_set_cell_data_func
                                                (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 GtkCellLayoutDataFunc func,
                                                 gpointer func_data,
                                                 GDestroyNotify destroy);
    void        gtk_cell_layout_clear_attributes
                                                (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell);

## Object Hierarchy

      GInterface
       +----GtkCellLayout

## Prerequisites

GtkCellLayout requires GObject.

## Known Implementations

GtkCellLayout is implemented by GtkEntryCompletion, GtkTreeViewColumn, GtkComboBox and GtkComboBoxEntry.

## Description

GtkCellLayout is an interface to be implemented by all objects which want to provide a GtkTreeViewColumn-like API for packing cells, setting attributes and data funcs.

## Details

### struct GtkCellLayout

    struct GtkCellLayout;

### struct GtkCellLayoutIface

    struct GtkCellLayoutIface {

      GTypeInterface g_iface;

      /* Virtual Table */
      void (* pack_start)         (GtkCellLayout         *cell_layout,
                                   GtkCellRenderer       *cell,
                                   gboolean               expand);
      void (* pack_end)           (GtkCellLayout         *cell_layout,
                                   GtkCellRenderer       *cell,
                                   gboolean               expand);
      void (* clear)              (GtkCellLayout         *cell_layout);
      void (* add_attribute)      (GtkCellLayout         *cell_layout,
                                   GtkCellRenderer       *cell,
                                   const gchar           *attribute,
                                   gint                   column);
      void (* set_cell_data_func) (GtkCellLayout         *cell_layout,
                                   GtkCellRenderer       *cell,
                                   GtkCellLayoutDataFunc  func,
                                   gpointer               func_data,
                                   GDestroyNotify         destroy);
      void (* clear_attributes)   (GtkCellLayout         *cell_layout,
                                   GtkCellRenderer       *cell);
      void (* reorder)            (GtkCellLayout         *cell_layout,
                                   GtkCellRenderer       *cell,
                                   gint                   position);
    };

### GtkCellLayoutDataFunc ()

    void        (*GtkCellLayoutDataFunc)        (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 GtkTreeModel *tree_model,
                                                 GtkTreeIter *iter,
                                                 gpointer data);

A function which should set the value of `cell_layout`'s cell renderer(s) as appropriate.

`cell_layout` : | a GtkCellLayout
`cell` : | the cell renderer whose value is to be set
`tree_model` : | the model
`iter` : | a GtkTreeIter indicating the row to set the value for
`data` : | user data passed to `gtk_cell_layout_set_cell_data_func()`

### gtk_cell_layout_pack_start ()

    void        gtk_cell_layout_pack_start      (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 gboolean expand);

Packs the `cell` into the beginning of `cell_layout`. If `expand` is `FALSE`, then the `cell` is allocated no more space than it needs. Any unused space is divided evenly between cells for which `expand` is `TRUE`.

`cell_layout` : | A GtkCellLayout.
`cell` : | A GtkCellRenderer.
`expand` : | `TRUE` if `cell` is to be given extra space allocated to `cell_layout`.

Since 2.4

### gtk_cell_layout_pack_end ()

    void        gtk_cell_layout_pack_end        (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 gboolean expand);

Adds the `cell` to the end of `cell_layout`. If `expand` is `FALSE`, then the `cell` is allocated no more space than it needs. Any unused space is divided evenly between cells for which `expand` is `TRUE`.

`cell_layout` : | A GtkCellLayout.
`cell` : | A GtkCellRenderer.
`expand` : | `TRUE` if `cell` is to be given extra space allocated to `cell_layout`.

Since 2.4

### gtk_cell_layout_reorder ()

    void        gtk_cell_layout_reorder         (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 gint position);

Re-inserts `cell` at `position`. Note that `cell` has already to be packed into `cell_layout` for this to function properly.

`cell_layout` : | A GtkCellLayout.
`cell` : | A GtkCellRenderer to reorder.
`position` : | New position to insert `cell` at.

Since 2.4

### gtk_cell_layout_clear ()

    void        gtk_cell_layout_clear           (GtkCellLayout *cell_layout);

Unsets all the mappings on all renderers on `cell_layout`.

`cell_layout` : | A GtkCellLayout.

Since 2.4

### gtk_cell_layout_set_attributes ()

    void        gtk_cell_layout_set_attributes  (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 ...);

Sets the attributes in list as the attributes of `cell_layout`. The attributes should be in attribute/column order, as in `gtk_cell_layout_add_attribute()`. All existing attributes are removed, and replaced with the new attributes.

`cell_layout` : | A GtkCellLayout.
`cell` : | A GtkCellRenderer.
`...` : | A `NULL`-terminated list of attributes.

Since 2.4

### gtk_cell_layout_add_attribute ()

    void        gtk_cell_layout_add_attribute   (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 const gchar *attribute,
                                                 gint column);

Adds an attribute mapping to the list in `cell_layout`. The `column` is the column of the model to get a value from, and the `attribute` is the parameter on `cell` to be set from the value. So for example if column 2 of the model contains strings, you could have the "text" attribute of a GtkCellRendererText get its values from column 2.

`cell_layout` : | A GtkCellLayout.
`cell` : | A GtkCellRenderer.
`attribute` : | An attribute on the renderer.
`column` : | The column position on the model to get the attribute from.

Since 2.4

### gtk_cell_layout_set_cell_data_func ()

    void        gtk_cell_layout_set_cell_data_func
                                                (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell,
                                                 GtkCellLayoutDataFunc func,
                                                 gpointer func_data,
                                                 GDestroyNotify destroy);

Sets the GtkCellLayoutDataFunc to use for `cell_layout`. This function is used instead of the standard attributes mapping for setting the column value, and should set the value of `cell_layout`'s cell renderer(s) as appropriate. `func` may be `NULL` to remove and older one.

`cell_layout` : | A GtkCellLayout.
`cell` : | A GtkCellRenderer.
`func` : | The GtkCellLayoutDataFunc to use.
`func_data` : | The user data for `func`.
`destroy` : | The destroy notification for `func_data`.

Since 2.4

### gtk_cell_layout_clear_attributes ()

    void        gtk_cell_layout_clear_attributes
                                                (GtkCellLayout *cell_layout,
                                                 GtkCellRenderer *cell);

Clears all existing attributes previously set with `gtk_cell_layout_set_attributes()`.

`cell_layout` : | A GtkCellLayout.
`cell` : | A GtkCellRenderer to clear the attribute mapping on.

Since 2.4