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The alignment widget is a container (see section 5.13 The container widget) derived from
the bin widget (see section 5.4 The bin widget). Its entire purpose is to give the
programmer flexibility in how the child it manages is positioned when a
window is resized.
Normally, a widget is allocated at least as much size as it
requests. (see section 5.13 The container widget for a discussion of geometry
management). When a widget is allocated more size than it requests there
is a question of how the widget should expand. By convention, most GTK
widgets expand to fill their allocated space. Sometimes this behavior is
not desired. The alignment widget allows the programmer to specify how a
widget should expand and position itself to fill the area it is
allocated.
- User Option: xscale
-
- User Option: yscale
-
The xscale and yscale options specify how to scale the child
widget. If the scale value is 0.0, the child widget is allocated exactly
the size it requested in that dimension. If the scale value is 1.0, the
child widget is allocated all of the space in a dimension. A scale value
of 1.0 for both x and y is equivalent to not using an alignment widget.
- User Option: xalign
-
- User Option: yalign
-
The xalign and yalign options specify how to position the
child widget when it is not allocated all the space available to it
(because the xscale and/or yscale options are less than
1.0). If an alignment value is 0.0 the widget is positioned to the left
(or top) of its allocated space. An alignment value of 1.0 positions the
widget to the right (or bottom) of its allocated space. A common usage
is to specify xalign and yalign to be 0.5 which causes the
widget to be centered within its allocated area.
- Function: guint gtk_alignment_get_type (void)
-
Returns the
GtkAlignment type identifier.
- Function: GtkWidget* gtk_alignment_new (gfloat xalign, gfloat yalign, gfloat xscale, gfloat yscale)
-
Create a new
GtkAlignment object and initialize it with the
values xalign, yalign, xscale and yscale. The
new widget is returned as a pointer to a GtkWidget
object. NULL is returned on failure.
- Function: void gtk_alignment_set (GtkAlignment *alignment, gfloat xalign, gfloat yalign, gfloat xscale, gfloat yscale)
-
Set the xalign, yalign, xscale and yscale options
of an alignment widget. It is important to not set the fields of the
GtkAlignment structure directly (or, for that matter, any type
derived from GtkObject).
@gtkstdmacros{Alignment, ALIGNMENT}
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