### Class

# Shumate Layer

since: 1.0

#### Description [src]

    abstract class Shumate.Layer : Gtk.Widget
      implements Gtk.Accessible, Gtk.Buildable, Gtk.ConstraintTarget {
      /* No available fields */
    }

Every layer (overlay that moves together with the map) has to inherit this class and implement its virtual methods.

You can use the same layer to display many types of maps. In Shumate they are called map sources. You can change the `ShumateMapLayer:map-source` property at any time to replace the current displayed map.

Available since: 1.0

#### Ancestors

- GtkWidget
- GInitiallyUnowned
- GObject

#### Descendants

- ShumateMapLayer
- ShumateMarkerLayer
- ShumatePathLayer

#### Implements

- GtkAccessible
- GtkBuildable
- GtkConstraintTarget

#### Instance methods

###### shumate_layer_get_viewport

Gets the `ShumateViewport` used by this layer.

since: 1.0

##### 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.

unstable since: 4.14

###### gtk_accessible_get_accessible_parent

Retrieves the accessible parent for an accessible object.

unstable since: 4.10

###### gtk_accessible_get_accessible_role

Retrieves the accessible role of an accessible object.

unstable since: 4.0

###### gtk_accessible_get_at_context

Retrieves the accessible implementation for the given `GtkAccessible`.

unstable since: 4.10

###### gtk_accessible_get_bounds

Queries the coordinates and dimensions of this accessible.

unstable since: 4.10

###### gtk_accessible_get_first_accessible_child

Retrieves the first accessible child of an accessible object.

unstable since: 4.10

###### gtk_accessible_get_next_accessible_sibling

Retrieves the next accessible sibling of an accessible object.

unstable since: 4.10

###### gtk_accessible_get_platform_state

Query a platform state, such as focus.

unstable since: 4.10

###### gtk_accessible_reset_property

Resets the accessible `property` to its default value.

unstable since: 4.0

###### gtk_accessible_reset_relation

Resets the accessible `relation` to its default value.

unstable since: 4.0

###### gtk_accessible_reset_state

Resets the accessible `state` to its default value.

unstable since: 4.0

###### gtk_accessible_set_accessible_parent

Sets the parent and sibling of an accessible object.

unstable since: 4.10

###### gtk_accessible_update_next_accessible_sibling

Updates the next accessible sibling of `self`.

unstable since: 4.10

###### gtk_accessible_update_property

Updates a list of accessible properties.

unstable since: 4.0

###### gtk_accessible_update_property_value

Updates an array of accessible properties.

unstable since: 4.0

###### gtk_accessible_update_relation

Updates a list of accessible relations.

unstable since: 4.0

###### gtk_accessible_update_relation_value

Updates an array of accessible relations.

unstable since: 4.0

###### gtk_accessible_update_state

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

unstable since: 4.0

###### gtk_accessible_update_state_value

Updates an array of accessible states.

unstable since: 4.0

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

###### gtk_buildable_get_buildable_id

Gets the ID of the `buildable` object.

unstable since: 4.0

#### Properties

###### Shumate.Layer:viewport

No description available.

since: 1.0

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

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

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

unstable since: 4.0

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

Whether the widget can receive pointer events.

unstable since: 4.0

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

A list of css classes applied to this widget.

unstable since: 4.0

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

The name of this widget in the CSS tree.

unstable since: 4.0

###### Gtk.Widget:cursor

The cursor used by `widget`.

unstable since: 4.0

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

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

unstable since: 4.0

###### Gtk.Widget:focusable

Whether this widget itself will accept the input focus.

unstable since: 4.0

###### Gtk.Widget:halign

How to distribute horizontal space if widget gets extra space.

unstable since: 4.0

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

Whether the widget is the default widget.

unstable since: 4.0

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

Whether the widget has the input focus.

unstable since: 4.0

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

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

unstable since: 4.0

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

Override for height request of the widget.

unstable since: 4.0

###### Gtk.Widget:hexpand

Whether to expand horizontally.

unstable since: 4.0

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

Whether to use the `hexpand` property.

unstable since: 4.0

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

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

unstable since: 4.0

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

Margin on bottom side of widget.

unstable since: 4.0

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

Margin on end of widget, horizontally.

unstable since: 4.0

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

Margin on start of widget, horizontally.

unstable since: 4.0

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

Margin on top side of widget.

unstable since: 4.0

###### Gtk.Widget:name

The name of the widget.

unstable since: 4.0

###### Gtk.Widget:opacity

The requested opacity of the widget.

unstable since: 4.0

###### Gtk.Widget:overflow

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

unstable since: 4.0

###### Gtk.Widget:parent

The parent widget of this widget.

unstable since: 4.0

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

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

unstable since: 4.0

###### Gtk.Widget:root

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

unstable since: 4.0

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

The scale factor of the widget.

unstable since: 4.0

###### Gtk.Widget:sensitive

Whether the widget responds to input.

unstable since: 4.0

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

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

unstable since: 4.0

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

Sets the text of tooltip to be the given string.

unstable since: 4.0

###### Gtk.Widget:valign

How to distribute vertical space if widget gets extra space.

unstable since: 4.0

###### Gtk.Widget:vexpand

Whether to expand vertically.

unstable since: 4.0

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

Whether to use the `vexpand` property.

unstable since: 4.0

###### Gtk.Widget:visible

Whether the widget is visible.

unstable since: 4.0

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

Override for width request of the widget.

unstable since: 4.0

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

###### Gtk.Accessible:accessible-role

The accessible role of the given `GtkAccessible` implementation.

unstable since: 4.0

#### Signals

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

###### GtkWidget::destroy

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

unstable since: 4.0

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

Emitted when the text direction of a widget changes.

unstable since: 4.0

###### GtkWidget::hide

Emitted when `widget` is hidden.

unstable since: 4.0

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

Emitted if keyboard navigation fails.

unstable since: 4.0

###### GtkWidget::map

Emitted when `widget` is going to be mapped.

unstable since: 4.0

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

Emitted when a widget is activated via a mnemonic.

unstable since: 4.0

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

Emitted when the focus is moved.

unstable since: 4.0

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

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

unstable since: 4.0

###### GtkWidget::realize

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

unstable since: 4.0

###### GtkWidget::show

Emitted when `widget` is shown.

unstable since: 4.0

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

Emitted when the widget state changes.

unstable since: 4.0

###### GtkWidget::unmap

Emitted when `widget` is going to be unmapped.

unstable since: 4.0

###### GtkWidget::unrealize

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

unstable since: 4.0

##### 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.

unstable since: 2.0

#### Class structure

    struct ShumateLayerClass {
      GtkWidgetClass parent_class;
      char* (* get_debug_text) (
        ShumateLayer* self
      );

    }

No description available.

###### Class members

`parent_class: GtkWidgetClass`
  No description available.
`get_debug_text: char* (* get_debug_text) ( ShumateLayer* self )`
  No description available.

#### Virtual methods

###### Shumate.LayerClass.get_debug_text

Returns a string to show in the debug overlay, which can be enabled in the GTK inspector.

since: 1.0