### Class

# Gtk IconView

deprecated: 4.10

#### Description [src]

    final class Gtk.IconView : Gtk.Widget
      implements Gtk.Accessible, Gtk.Buildable, Gtk.CellLayout, Gtk.ConstraintTarget, Gtk.Scrollable {
      /* No available fields */
    }

`GtkIconView` is a widget which displays data in a grid of icons.

`GtkIconView` provides an alternative view on a `GtkTreeModel`. It displays the model as a grid of icons with labels. Like `GtkTreeView`, it allows to select one or multiple items (depending on the selection mode, see `gtk_icon_view_set_selection_mode()`). In addition to selection with the arrow keys, `GtkIconView` supports rubberband selection, which is controlled by dragging the pointer.

Note that if the tree model is backed by an actual tree store (as opposed to a flat list where the mapping to icons is obvious), `GtkIconView` will only display the first level of the tree and ignore the tree’s branches.

## CSS nodes

    iconview.view
    ╰── [rubberband]

`GtkIconView` has a single CSS node with name iconview and style class .view. For rubberband selection, a subnode with name rubberband is used.

Deprecated since: 4.10

Use `GtkGridView` instead.

#### Ancestors

- GtkWidget
- GInitiallyUnowned
- GObject

#### Implements

- GtkAccessible
- GtkBuildable
- GtkCellLayout
- GtkConstraintTarget
- GtkScrollable

#### Constructors

###### gtk_icon_view_new

Creates a new `GtkIconView` widget.

deprecated: 4.10

###### gtk_icon_view_new_with_area

Creates a new `GtkIconView` widget using the specified `area` to layout cells inside the icons.

deprecated: 4.10

###### gtk_icon_view_new_with_model

Creates a new `GtkIconView` widget with the model `model`.

deprecated: 4.10

#### Instance methods

###### gtk_icon_view_create_drag_icon

Creates a `GdkPaintable` representation of the item at `path`. This image is used for a drag icon.

deprecated: 4.10

###### gtk_icon_view_enable_model_drag_dest

Turns `icon_view` into a drop destination for automatic DND. Calling this method sets `GtkIconView`:reorderable to `FALSE`.

deprecated: 4.10

###### gtk_icon_view_enable_model_drag_source

Turns `icon_view` into a drag source for automatic DND. Calling this method sets `GtkIconView`:reorderable to `FALSE`.

deprecated: 4.10

###### gtk_icon_view_get_activate_on_single_click

Gets the setting set by gtk_icon_view_set_activate_on_single_click().

deprecated: 4.10

###### gtk_icon_view_get_cell_rect

Fills the bounding rectangle in widget coordinates for the cell specified by `path` and `cell`. If `cell` is `NULL` the main cell area is used.

deprecated: 4.10

###### gtk_icon_view_get_column_spacing

Returns the value of the ::column-spacing property.

deprecated: 4.10

###### gtk_icon_view_get_columns

Returns the value of the ::columns property.

deprecated: 4.10

###### gtk_icon_view_get_cursor

Fills in `path` and `cell` with the current cursor path and cell. If the cursor isn’t currently set, then `path` will be `NULL`. If no cell currently has focus, then `cell` will be `NULL`.

deprecated: 4.10

###### gtk_icon_view_get_dest_item_at_pos

Determines the destination item for a given position.

deprecated: 4.10

###### gtk_icon_view_get_drag_dest_item

Gets information about the item that is highlighted for feedback.

deprecated: 4.10

###### gtk_icon_view_get_item_at_pos

Gets the path and cell for the icon at the given position.

deprecated: 4.10

###### gtk_icon_view_get_item_column

Gets the column in which the item `path` is currently displayed. Column numbers start at 0.

deprecated: 4.10

###### gtk_icon_view_get_item_orientation

Returns the value of the ::item-orientation property which determines whether the labels are drawn beside the icons instead of below.

deprecated: 4.10

###### gtk_icon_view_get_item_padding

Returns the value of the ::item-padding property.

deprecated: 4.10

###### gtk_icon_view_get_item_row

Gets the row in which the item `path` is currently displayed. Row numbers start at 0.

deprecated: 4.10

###### gtk_icon_view_get_item_width

Returns the value of the ::item-width property.

deprecated: 4.10

###### gtk_icon_view_get_margin

Returns the value of the ::margin property.

deprecated: 4.10

###### gtk_icon_view_get_markup_column

Returns the column with markup text for `icon_view`.

deprecated: 4.10

###### gtk_icon_view_get_model

Returns the model the `GtkIconView` is based on. Returns `NULL` if the model is unset.

deprecated: 4.10

###### gtk_icon_view_get_path_at_pos

Gets the path for the icon at the given position.

deprecated: 4.10

###### gtk_icon_view_get_pixbuf_column

Returns the column with pixbufs for `icon_view`.

deprecated: 4.10

###### gtk_icon_view_get_reorderable

Retrieves whether the user can reorder the list via drag-and-drop. See gtk_icon_view_set_reorderable().

deprecated: 4.10

###### gtk_icon_view_get_row_spacing

Returns the value of the ::row-spacing property.

deprecated: 4.10

###### gtk_icon_view_get_selected_items

Creates a list of paths of all selected items. Additionally, if you are planning on modifying the model after calling this function, you may want to convert the returned list into a list of `GtkTreeRowReferences`. To do this, you can use gtk_tree_row_reference_new().

deprecated: 4.10

###### gtk_icon_view_get_selection_mode

Gets the selection mode of the `icon_view`.

deprecated: 4.10

###### gtk_icon_view_get_spacing

Returns the value of the ::spacing property.

deprecated: 4.10

###### gtk_icon_view_get_text_column

Returns the column with text for `icon_view`.

deprecated: 4.10

###### gtk_icon_view_get_tooltip_column

Returns the column of `icon_view`’s model which is being used for displaying tooltips on `icon_view`’s rows.

deprecated: 4.10

###### gtk_icon_view_get_tooltip_context

This function is supposed to be used in a `GtkWidget::query-tooltip` signal handler for `GtkIconView`. The `x`, `y` and `keyboard_tip` values which are received in the signal handler, should be passed to this function without modification.

deprecated: 4.10

###### gtk_icon_view_get_visible_range

Sets `start_path` and `end_path` to be the first and last visible path. Note that there may be invisible paths in between.

deprecated: 4.10

###### gtk_icon_view_item_activated

Activates the item determined by `path`.

deprecated: 4.10

###### gtk_icon_view_path_is_selected

Returns `TRUE` if the icon pointed to by `path` is currently selected. If `path` does not point to a valid location, `FALSE` is returned.

deprecated: 4.10

###### gtk_icon_view_scroll_to_path

Moves the alignments of `icon_view` to the position specified by `path`. `row_align` determines where the row is placed, and `col_align` determines where `column` is placed. Both are expected to be between 0.0 and 1.0. 0.0 means left/top alignment, 1.0 means right/bottom alignment, 0.5 means center.

deprecated: 4.10

###### gtk_icon_view_select_all

Selects all the icons. `icon_view` must has its selection mode set to `GTK_SELECTION_MULTIPLE`.

deprecated: 4.10

###### gtk_icon_view_select_path

Selects the row at `path`.

deprecated: 4.10

###### gtk_icon_view_selected_foreach

Calls a function for each selected icon. Note that the model or selection cannot be modified from within this function.

deprecated: 4.10

###### gtk_icon_view_set_activate_on_single_click

Causes the `GtkIconView`::item-activated signal to be emitted on a single click instead of a double click.

deprecated: 4.10

###### gtk_icon_view_set_column_spacing

Sets the ::column-spacing property which specifies the space which is inserted between the columns of the icon view.

deprecated: 4.10

###### gtk_icon_view_set_columns

Sets the ::columns property which determines in how many columns the icons are arranged. If `columns` is -1, the number of columns will be chosen automatically to fill the available area.

deprecated: 4.10

###### gtk_icon_view_set_cursor

Sets the current keyboard focus to be at `path`, and selects it. This is useful when you want to focus the user’s attention on a particular item. If `cell` is not `NULL`, then focus is given to the cell specified by it. Additionally, if `start_editing` is `TRUE`, then editing should be started in the specified cell.

deprecated: 4.10

###### gtk_icon_view_set_drag_dest_item

Sets the item that is highlighted for feedback.

deprecated: 4.10

###### gtk_icon_view_set_item_orientation

Sets the ::item-orientation property which determines whether the labels are drawn beside the icons instead of below.

deprecated: 4.10

###### gtk_icon_view_set_item_padding

Sets the `GtkIconView`:item-padding property which specifies the padding around each of the icon view’s items.

deprecated: 4.10

###### gtk_icon_view_set_item_width

Sets the ::item-width property which specifies the width to use for each item. If it is set to -1, the icon view will automatically determine a suitable item size.

deprecated: 4.10

###### gtk_icon_view_set_margin

Sets the ::margin property which specifies the space which is inserted at the top, bottom, left and right of the icon view.

deprecated: 4.10

###### gtk_icon_view_set_markup_column

Sets the column with markup information for `icon_view` to be `column`. The markup column must be of type `G_TYPE_STRING`. If the markup column is set to something, it overrides the text column set by gtk_icon_view_set_text_column().

deprecated: 4.10

###### gtk_icon_view_set_model

Sets the model for a `GtkIconView`. If the `icon_view` already has a model set, it will remove it before setting the new model. If `model` is `NULL`, then it will unset the old model.

deprecated: 4.10

###### gtk_icon_view_set_pixbuf_column

Sets the column with pixbufs for `icon_view` to be `column`. The pixbuf column must be of type `GDK_TYPE_PIXBUF`.

deprecated: 4.10

###### gtk_icon_view_set_reorderable

This function is a convenience function to allow you to reorder models that support the `GtkTreeDragSourceIface` and the `GtkTreeDragDestIface`. Both `GtkTreeStore` and `GtkListStore` support these. If `reorderable` is `TRUE`, then the user can reorder the model by dragging and dropping rows. The developer can listen to these changes by connecting to the model’s row_inserted and row_deleted signals. The reordering is implemented by setting up the icon view as a drag source and destination. Therefore, drag and drop can not be used in a reorderable view for any other purpose.

deprecated: 4.10

###### gtk_icon_view_set_row_spacing

Sets the ::row-spacing property which specifies the space which is inserted between the rows of the icon view.

deprecated: 4.10

###### gtk_icon_view_set_selection_mode

Sets the selection mode of the `icon_view`.

deprecated: 4.10

###### gtk_icon_view_set_spacing

Sets the ::spacing property which specifies the space which is inserted between the cells (i.e. the icon and the text) of an item.

deprecated: 4.10

###### gtk_icon_view_set_text_column

Sets the column with text for `icon_view` to be `column`. The text column must be of type `G_TYPE_STRING`.

deprecated: 4.10

###### gtk_icon_view_set_tooltip_cell

Sets the tip area of `tooltip` to the area which `cell` occupies in the item pointed to by `path`. See also gtk_tooltip_set_tip_area().

deprecated: 4.10

###### gtk_icon_view_set_tooltip_column

If you only plan to have simple (text-only) tooltips on full items, you can use this function to have `GtkIconView` handle these automatically for you. `column` should be set to the column in `icon_view`’s model containing the tooltip texts, or -1 to disable this feature.

deprecated: 4.10

###### gtk_icon_view_set_tooltip_item

Sets the tip area of `tooltip` to be the area covered by the item at `path`. See also `gtk_icon_view_set_tooltip_column()` for a simpler alternative. See also gtk_tooltip_set_tip_area().

deprecated: 4.10

###### gtk_icon_view_unselect_all

Unselects all the icons.

deprecated: 4.10

###### gtk_icon_view_unselect_path

Unselects the row at `path`.

deprecated: 4.10

###### gtk_icon_view_unset_model_drag_dest

Undoes the effect of gtk_icon_view_enable_model_drag_dest(). Calling this method sets `GtkIconView`:reorderable to `FALSE`.

deprecated: 4.10

###### gtk_icon_view_unset_model_drag_source

Undoes the effect of gtk_icon_view_enable_model_drag_source(). Calling this method sets `GtkIconView`:reorderable to `FALSE`.

deprecated: 4.10

##### Methods inherited from GtkWidget (162)

Please see GtkWidget for a full list of methods.

##### Methods inherited from GObject (43)

Please see GObject for a full list of methods.

##### Methods inherited from GtkAccessible (19)

###### gtk_accessible_announce

Requests the user’s screen reader to announce the given message.

since: 4.14

###### gtk_accessible_get_accessible_parent

Retrieves the accessible parent for an accessible object.

since: 4.10

###### gtk_accessible_get_accessible_role

Retrieves the accessible role of an accessible object.

###### gtk_accessible_get_at_context

Retrieves the accessible implementation for the given `GtkAccessible`.

since: 4.10

###### gtk_accessible_get_bounds

Queries the coordinates and dimensions of this accessible.

since: 4.10

###### gtk_accessible_get_first_accessible_child

Retrieves the first accessible child of an accessible object.

since: 4.10

###### gtk_accessible_get_next_accessible_sibling

Retrieves the next accessible sibling of an accessible object.

since: 4.10

###### gtk_accessible_get_platform_state

Query a platform state, such as focus.

since: 4.10

###### gtk_accessible_reset_property

Resets the accessible `property` to its default value.

###### gtk_accessible_reset_relation

Resets the accessible `relation` to its default value.

###### gtk_accessible_reset_state

Resets the accessible `state` to its default value.

###### gtk_accessible_set_accessible_parent

Sets the parent and sibling of an accessible object.

since: 4.10

###### gtk_accessible_update_next_accessible_sibling

Updates the next accessible sibling of `self`.

since: 4.10

###### gtk_accessible_update_property

Updates a list of accessible properties.

###### gtk_accessible_update_property_value

Updates an array of accessible properties.

###### gtk_accessible_update_relation

Updates a list of accessible relations.

###### gtk_accessible_update_relation_value

Updates an array of accessible relations.

###### gtk_accessible_update_state

Updates a list of accessible states. See the `GtkAccessibleState` documentation for the value types of accessible states.

###### gtk_accessible_update_state_value

Updates an array of accessible states.

##### Methods inherited from GtkBuildable (1)

###### gtk_buildable_get_buildable_id

Gets the ID of the `buildable` object.

##### Methods inherited from GtkCellLayout (10)

###### gtk_cell_layout_add_attribute

Adds an attribute mapping to the list in `cell_layout`.

deprecated: 4.10

###### gtk_cell_layout_clear

Unsets all the mappings on all renderers on `cell_layout` and removes all renderers from `cell_layout`.

deprecated: 4.10

###### gtk_cell_layout_clear_attributes

Clears all existing attributes previously set with gtk_cell_layout_set_attributes().

deprecated: 4.10

###### gtk_cell_layout_get_area

Returns the underlying `GtkCellArea` which might be `cell_layout` if called on a `GtkCellArea` or might be `NULL` if no `GtkCellArea` is used by `cell_layout`.

deprecated: 4.10

###### gtk_cell_layout_get_cells

Returns the cell renderers which have been added to `cell_layout`.

deprecated: 4.10

###### gtk_cell_layout_pack_end

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`.

deprecated: 4.10

###### gtk_cell_layout_pack_start

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`.

deprecated: 4.10

###### gtk_cell_layout_reorder

Re-inserts `cell` at `position`.

deprecated: 4.10

###### gtk_cell_layout_set_attributes

Sets the attributes in the parameter list as the attributes of `cell_layout`.

deprecated: 4.10

###### gtk_cell_layout_set_cell_data_func

Sets the `GtkCellLayout`DataFunc to use for `cell_layout`.

deprecated: 4.10

##### Methods inherited from GtkScrollable (9)

###### gtk_scrollable_get_border

Returns the size of a non-scrolling border around the outside of the scrollable.

###### gtk_scrollable_get_hadjustment

Retrieves the `GtkAdjustment` used for horizontal scrolling.

###### gtk_scrollable_get_hscroll_policy

Gets the horizontal `GtkScrollablePolicy`.

###### gtk_scrollable_get_vadjustment

Retrieves the `GtkAdjustment` used for vertical scrolling.

###### gtk_scrollable_get_vscroll_policy

Gets the vertical `GtkScrollablePolicy`.

###### gtk_scrollable_set_hadjustment

Sets the horizontal adjustment of the `GtkScrollable`.

###### gtk_scrollable_set_hscroll_policy

Sets the `GtkScrollablePolicy`.

###### gtk_scrollable_set_vadjustment

Sets the vertical adjustment of the `GtkScrollable`.

###### gtk_scrollable_set_vscroll_policy

Sets the `GtkScrollablePolicy`.

#### Properties

###### Gtk.IconView:activate-on-single-click

The activate-on-single-click property specifies whether the “item-activated” signal will be emitted after a single click.

###### Gtk.IconView:cell-area

The `GtkCellArea` used to layout cell renderers for this view.

###### Gtk.IconView:column-spacing

The column-spacing property specifies the space which is inserted between the columns of the icon view.

###### Gtk.IconView:columns

The columns property contains the number of the columns in which the items should be displayed. If it is -1, the number of columns will be chosen automatically to fill the available area.

###### Gtk.IconView:item-orientation

The item-orientation property specifies how the cells (i.e. the icon and the text) of the item are positioned relative to each other.

###### Gtk.IconView:item-padding

The item-padding property specifies the padding around each of the icon view’s item.

###### Gtk.IconView:item-width

The item-width property specifies the width to use for each item. If it is set to -1, the icon view will automatically determine a suitable item size.

###### Gtk.IconView:margin

The margin property specifies the space which is inserted at the edges of the icon view.

###### Gtk.IconView:markup-column

The ::markup-column property contains the number of the model column containing markup information to be displayed. The markup column must be of type `G_TYPE_STRING`. If this property and the :text-column property are both set to column numbers, it overrides the text column. If both are set to -1, no texts are displayed.

###### Gtk.IconView:model

The model of the icon view.

###### Gtk.IconView:pixbuf-column

The ::pixbuf-column property contains the number of the model column containing the pixbufs which are displayed. The pixbuf column must be of type `GDK_TYPE_PIXBUF`. Setting this property to -1 turns off the display of pixbufs.

###### Gtk.IconView:reorderable

The reorderable property specifies if the items can be reordered by DND.

###### Gtk.IconView:row-spacing

The row-spacing property specifies the space which is inserted between the rows of the icon view.

###### Gtk.IconView:selection-mode

The ::selection-mode property specifies the selection mode of icon view. If the mode is `GTK_SELECTION_MULTIPLE`, rubberband selection is enabled, for the other modes, only keyboard selection is possible.

###### Gtk.IconView:spacing

The spacing property specifies the space which is inserted between the cells (i.e. the icon and the text) of an item.

###### Gtk.IconView:text-column

The ::text-column property contains the number of the model column containing the texts which are displayed. The text column must be of type `G_TYPE_STRING`. If this property and the :markup-column property are both set to -1, no texts are displayed.

###### Gtk.IconView:tooltip-column

The column of the icon view model which is being used for displaying tooltips on it’s rows.

##### Properties inherited from GtkWidget (34)

###### Gtk.Widget:can-focus

Whether the widget or any of its descendents can accept the input focus.

###### Gtk.Widget:can-target

Whether the widget can receive pointer events.

###### Gtk.Widget:css-classes

A list of css classes applied to this widget.

###### Gtk.Widget:css-name

The name of this widget in the CSS tree.

###### Gtk.Widget:cursor

The cursor used by `widget`.

###### Gtk.Widget:focus-on-click

Whether the widget should grab focus when it is clicked with the mouse.

###### Gtk.Widget:focusable

Whether this widget itself will accept the input focus.

###### Gtk.Widget:halign

How to distribute horizontal space if widget gets extra space.

###### Gtk.Widget:has-default

Whether the widget is the default widget.

###### Gtk.Widget:has-focus

Whether the widget has the input focus.

###### Gtk.Widget:has-tooltip

Enables or disables the emission of the ::query-tooltip signal on `widget`.

###### Gtk.Widget:height-request

Override for height request of the widget.

###### Gtk.Widget:hexpand

Whether to expand horizontally.

###### Gtk.Widget:hexpand-set

Whether to use the `hexpand` property.

###### Gtk.Widget:layout-manager

The `GtkLayoutManager` instance to use to compute the preferred size of the widget, and allocate its children.

###### Gtk.Widget:margin-bottom

Margin on bottom side of widget.

###### Gtk.Widget:margin-end

Margin on end of widget, horizontally.

###### Gtk.Widget:margin-start

Margin on start of widget, horizontally.

###### Gtk.Widget:margin-top

Margin on top side of widget.

###### Gtk.Widget:name

The name of the widget.

###### Gtk.Widget:opacity

The requested opacity of the widget.

###### Gtk.Widget:overflow

How content outside the widget’s content area is treated.

###### Gtk.Widget:parent

The parent widget of this widget.

###### Gtk.Widget:receives-default

Whether the widget will receive the default action when it is focused.

###### Gtk.Widget:root

The `GtkRoot` widget of the widget tree containing this widget.

###### Gtk.Widget:scale-factor

The scale factor of the widget.

###### Gtk.Widget:sensitive

Whether the widget responds to input.

###### Gtk.Widget:tooltip-markup

Sets the text of tooltip to be the given string, which is marked up with Pango markup.

###### Gtk.Widget:tooltip-text

Sets the text of tooltip to be the given string.

###### Gtk.Widget:valign

How to distribute vertical space if widget gets extra space.

###### Gtk.Widget:vexpand

Whether to expand vertically.

###### Gtk.Widget:vexpand-set

Whether to use the `vexpand` property.

###### Gtk.Widget:visible

Whether the widget is visible.

###### Gtk.Widget:width-request

Override for width request of the widget.

##### Properties inherited from GtkAccessible (1)

###### GtkAccessible:accessible-role

The accessible role of the given `GtkAccessible` implementation.

##### Properties inherited from GtkScrollable (4)

###### GtkScrollable:hadjustment

Horizontal `GtkAdjustment` of the scrollable widget.

###### GtkScrollable:hscroll-policy

Determines when horizontal scrolling should start.

###### GtkScrollable:vadjustment

Vertical `GtkAdjustment` of the scrollable widget.

###### GtkScrollable:vscroll-policy

Determines when vertical scrolling should start.

#### Signals

###### Gtk.IconView::activate-cursor-item

A keybinding signal which gets emitted when the user activates the currently focused item.

###### Gtk.IconView::item-activated

The ::item-activated signal is emitted when the method `gtk_icon_view_item_activated()` is called, when the user double clicks an item with the “activate-on-single-click” property set to `FALSE`, or when the user single clicks an item when the “activate-on-single-click” property set to `TRUE`. It is also emitted when a non-editable item is selected and one of the keys: Space, Return or Enter is pressed.

###### Gtk.IconView::move-cursor

The ::move-cursor signal is a keybinding signal which gets emitted when the user initiates a cursor movement.

###### Gtk.IconView::select-all

A keybinding signal which gets emitted when the user selects all items.

###### Gtk.IconView::select-cursor-item

A keybinding signal which gets emitted when the user selects the item that is currently focused.

###### Gtk.IconView::selection-changed

The ::selection-changed signal is emitted when the selection (i.e. the set of selected items) changes.

###### Gtk.IconView::toggle-cursor-item

A keybinding signal which gets emitted when the user toggles whether the currently focused item is selected or not. The exact effect of this depend on the selection mode.

###### Gtk.IconView::unselect-all

A keybinding signal which gets emitted when the user unselects all items.

##### Signals inherited from GtkWidget (13)

###### GtkWidget::destroy

Signals that all holders of a reference to the widget should release the reference that they hold.

###### GtkWidget::direction-changed

Emitted when the text direction of a widget changes.

###### GtkWidget::hide

Emitted when `widget` is hidden.

###### GtkWidget::keynav-failed

Emitted if keyboard navigation fails.

###### GtkWidget::map

Emitted when `widget` is going to be mapped.

###### GtkWidget::mnemonic-activate

Emitted when a widget is activated via a mnemonic.

###### GtkWidget::move-focus

Emitted when the focus is moved.

###### GtkWidget::query-tooltip

Emitted when the widget’s tooltip is about to be shown.

###### GtkWidget::realize

Emitted when `widget` is associated with a `GdkSurface`.

###### GtkWidget::show

Emitted when `widget` is shown.

###### GtkWidget::state-flags-changed

Emitted when the widget state changes.

###### GtkWidget::unmap

Emitted when `widget` is going to be unmapped.

###### GtkWidget::unrealize

Emitted when the `GdkSurface` associated with `widget` is destroyed.

##### Signals inherited from GObject (1)

###### GObject::notify

The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.