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.Dd December 21, 2022
.Dt AG_MPANE 3
.Os Agar 1.7
.Sh NAME
.Nm AG_MPane
.Nd agar multiple paned view widget
.Sh SYNOPSIS
.Bd -literal
#include <agar/core.h>
#include <agar/gui.h>
.Ed
.Sh DESCRIPTION
.\" IMAGE(/widgets/AG_Pane.png, "The AG_Pane widget")
The
.Nm
widget divides space into a set of
.Xr AG_Box 3
partitions much like the
.Xr AG_Pane 3
widget, except that up to 4 partitions are allowed.
It is possible to switch during different partition layouts at runtime,
making
.Nm
useful for 3D modeling applications.
.Sh INHERITANCE HIERARCHY
.Xr AG_Object 3 ->
.Xr AG_Widget 3 ->
.Nm .
.Sh INITIALIZATION
.nr nS 1
.Ft "AG_MPane *"
.Fn AG_MPaneNew "AG_Widget *parent" "enum ag_mpane_layout layout" "Uint flags"
.Pp
.Ft "void"
.Fn AG_MPaneSetLayout "AG_MPane *mpane" "enum ag_mpane_layout layout"
.Pp
.nr nS 0
The
.Fn AG_MPaneNew
function allocates, initializes, and attaches a new
.Nm
widget.
Acceptable values for the
.Fa layout
argument include:
.Bd -literal
.\" SYNTAX(c)
enum ag_mpane_layout {
	AG_MPANE1,		/* Single view */
	AG_MPANE2V,		/* Dual views (left/right) */
	AG_MPANE2H,		/* Dual views (top/bottom) */
	AG_MPANE2L1R,		/* Two views left, one view right */
	AG_MPANE1L2R,		/* One view left, two views right */
	AG_MPANE2T1B,		/* Two views top, one view bottom */
	AG_MPANE1T2B,		/* One view top, two views bottom */
	AG_MPANE3L1R,		/* Three views left, one view right */
	AG_MPANE1L3R,		/* One view left, three views right */
	AG_MPANE3T1B,		/* Three views top, one view bottom */
	AG_MPANE1T3B,		/* One view top, three views bottom */
	AG_MPANE4		/* Four views */
};
.Ed
.Pp
Acceptable
.Fa flags
include:
.Bl -tag -width "AG_MPANE_FORCE_DIV "
.It AG_MPANE_FRAMES
Render decorative frames.
.It AG_MPANE_FORCE_DIV
Don't allow the user to move the dividers.
.It AG_MPANE_HFILL
Expand horizontally in parent container.
.It AG_MPANE_VFILL
Expand vertically in parent container.
.It AG_MPANE_EXPAND
Shorthand for
.Dv AG_MPANE_HFILL | AG_MPANE_VFILL .
.El
.Pp
The
.Fn AG_MPaneSetLayout
function changes the current layout, recreating all the
.Xr AG_Box 3
partitions from scratch.
.Sh EVENTS
The
.Nm
widget does not generate any event.
.Sh STRUCTURE DATA
For the
.Ft AG_MPane
object:
.Pp
.Bl -tag -compact -width "enum ag_mpane_layout layout "
.It Ft enum ag_mpane_layout layout
Layout as set by
.Fn AG_MPaneSetLayout .
.It Ft AG_Box *panes[]
The container widgets
.It Ft Uint npanes
Number of containers for current layout.
.El
.Sh SEE ALSO
.Xr AG_Box 3 ,
.Xr AG_Intro 3 ,
.Xr AG_Pane 3 ,
.Xr AG_Widget 3 ,
.Xr AG_Window 3
.Sh HISTORY
The
.Nm
widget first appeared in Agar 1.0.
.Sh BUGS
Unlike with
.Xr AG_Pane 3 ,
it is impossible to reuse existing containers.