Class: Gtk::LayoutManager

Inherits:

Object

• Object
• Gtk::LayoutManager

Defined in:

(unknown)

Overview

The GtkLayoutManagerClass structure contains only private data, and
should only be accessed through the provided API, or when subclassing
GtkLayoutManager.

Direct Known Subclasses

BinLayout, BoxLayout, CenterLayout, ConstraintLayout, CustomLayout, FixedLayout, GridLayout, OverlayLayout

Instance Method Summary

• #allocate(widget, width, height, baseline) ⇒ nil

  Assigns the given width, height, and baseline to a widget, and computes the position and sizes of the children of the widget using the layout management policy of manager.

• #get_layout_child(child) ⇒ Gtk::LayoutChild

  Retrieves a GtkLayoutChild instance for the GtkLayoutManager, creating one if necessary.

• #layout_changed ⇒ nil

  Queues a resize on the GtkWidget using manager, if any.

• #measure(widget, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline) ⇒ nil

  Measures the size of the widget using manager, for the given orientation and size.

• #request_mode ⇒ Gtk::SizeRequestMode

  Retrieves the request mode of manager.

• #widget ⇒ Gtk::Widget

  Retrieves the GtkWidget using the given GtkLayoutManager.

Instance Method Details

#allocate(widget, width, height, baseline) ⇒ nil

Assigns the given width, height, and baseline to
a widget, and computes the position and sizes of the children of
the widget using the layout management policy of manager.

Parameters:

• widget (Gtk::Widget) —

  the GtkWidget using manager

• width (Integer) —

  the new width of the widget

• height (Integer) —

  the new height of the widget

• baseline (Integer) —

  the baseline position of the widget, or -1

Returns:

• (nil)

#get_layout_child(child) ⇒ Gtk::LayoutChild

Retrieves a GtkLayoutChild instance for the GtkLayoutManager,
creating one if necessary.

The child widget must be a child of the widget using manager.

The GtkLayoutChild instance is owned by the GtkLayoutManager,
and is guaranteed to exist as long as child is a child of the
GtkWidget using the given GtkLayoutManager.

Parameters:

• child (Gtk::Widget) —

  a GtkWidget

Returns:

• (Gtk::LayoutChild) —

  a GtkLayoutChild

#layout_changed ⇒ nil

Queues a resize on the GtkWidget using manager, if any.

This function should be called by subclasses of GtkLayoutManager
in response to changes to their layout management policies.

Returns:

• (nil)

#measure(widget, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline) ⇒ nil

Measures the size of the widget using manager, for the
given orientation and size.

See the [classGtk.Widget] documentation on layout management for
more details.

Parameters:

• widget (Gtk::Widget) —

  the GtkWidget using manager

• orientation (Gtk::Orientation) —

  the orientation to measure

• for_size (Integer) —

  Size for the opposite of orientation; for instance, if
  the orientation is %GTK_ORIENTATION_HORIZONTAL, this is the height
  of the widget; if the orientation is %GTK_ORIENTATION_VERTICAL, this
  is the width of the widget. This allows to measure the height for the
  given width, and the width for the given height. Use -1 if the size
  is not known

• minimum (Integer) —

  the minimum size for the given size and
  orientation

• natural (Integer) —

  the natural, or preferred size for the
  given size and orientation

• minimum_baseline (Integer) —

  the baseline position for the
  minimum size

• natural_baseline (Integer) —

  the baseline position for the
  natural size

Returns:

• (nil)

#request_mode ⇒ Gtk::SizeRequestMode

Retrieves the request mode of manager.

Returns:

• (Gtk::SizeRequestMode) —

  a GtkSizeRequestMode

#widget ⇒ Gtk::Widget

Retrieves the GtkWidget using the given GtkLayoutManager.

Returns:

• (Gtk::Widget) —

  a GtkWidget