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#lang scribble/doc
@(require "common.rkt")

@definterface/title[area-container<%> (area<%>)]{

An @racket[area-container<%>] is a container @racket[area<%>].

All @racket[area-container<%>] classes accept the following named
instantiation arguments:
@itemize[

 @item{@indexed-racket[border] --- default is @racket[0]; passed to
@method[area-container<%> border]} 
 @item{@indexed-racket[spacing] --- default is @racket[0]; passed to
@method[area-container<%> spacing]} 
 @item{@indexed-racket[alignment] --- default is class-specific, such as
 @racket['(center top)] for @racket[vertical-panel%]; the list
 elements are passed to
@method[area-container<%> set-alignment]} 
]



@defmethod[(add-child [child (is-a?/c subwindow<%>)])
           void?]{
Add the given subwindow to the set of non-deleted children. See also
@method[area-container<%> change-children].

}

@defmethod[(after-new-child [child (is-a?/c subarea<%>)])
           void?]{
@methspec{

This method is called after a new containee area is created with this
 area as its container. The new child is provided as an argument to
 the method.

}
@methimpl{

Does nothing.



}}

@defmethod[(begin-container-sequence)
           void?]{
Suspends geometry management in the container's top-level window
 until
@method[area-container<%> end-container-sequence] is called. The
@method[area-container<%> begin-container-sequence] and 
@method[area-container<%> end-container-sequence] methods are used to bracket a set of container modifications so that
 the resulting geometry is computed only once.  A container sequence also 
 delays show and hide actions by
@method[area-container<%> change-children], as well as the on-screen part of showing via
@method[window<%> show] until the sequence is complete.  Sequence begin and end commands may
 be nested arbitrarily deeply.

}

@defmethod*[([(border)
              spacing-integer?]
             [(border [margin spacing-integer?])
              void?])]{

Gets or sets the border margin for the container in pixels. This
 margin is used as an inset into the panel's client area before the
 locations and sizes of the subareas are computed.
}


@defmethod[(change-children [filter ((listof (is-a?/c subarea<%>)) 
                                     . -> . (listof (is-a?/c subarea<%>)))])
           void?]{

Takes a filter procedure and changes the container's list of
non-deleted children. The filter procedure takes a list of
children areas and returns a new list of children areas. The new
list must consist of children that were created as subareas of
this area (i.e., @method[area-container<%> change-children]
cannot be used to change the parent of a subarea).

After the set of non-deleted children is changed, the container computes
 the sets of newly deleted and newly non-deleted children. Newly deleted
 windows are hidden. Newly non-deleted windows are shown.

Since non-window areas cannot be hidden, non-window areas cannot be
 deleted. If the filter procedure removes non-window subareas,
 an exception is raised and the set of non-deleted children is not changed.

}

@defmethod[(container-flow-modified)
           void?]{
Call this method when the result changes for an overridden flow-defining method, such as
@method[area-container<%> place-children]. The call notifies the geometry manager that the placement of the
 container's children needs to be recomputed. 

The
@method[area-container<%> reflow-container]method only recomputes child positions when the geometry manager
 thinks that the placement has changed since the last computation.

}

@defmethod[(container-size [info (listof (list/c dimension-integer?
                                                 dimension-integer?
                                                 any/c
                                                 any/c))])
           (values dimension-integer? dimension-integer?)]{

Called to determine the minimum size of a container. See
 @|geomdiscuss| for more information.

}

@defmethod[(delete-child [child (is-a?/c subwindow<%>)])
           void?]{
Removes the given subwindow from the list of non-deleted children.  See also
@method[area-container<%> change-children].

}

@defmethod[(end-container-sequence)
           void?]{

See
@method[area-container<%> begin-container-sequence].

}

@defmethod[(get-alignment)
           (values (symbols 'right 'center 'left)
                   (symbols 'bottom 'center 'top))]{

Returns the container's current alignment specification. See
@method[area-container<%> set-alignment] for more information.

}

@defmethod[(get-children)
           (listof (is-a?/c subarea<%>))]{
Returns a list of the container's non-deleted children. (The non-deleted
 children are the ones currently managed by the container; deleted
 children are generally hidden.) The order of the children in the list
 is significant. For example, in a vertical panel, the first child in
 the list is placed at the top of the panel.

}

@defmethod[(place-children [info (listof (list/c dimension-integer?
                                                 dimension-integer?
                                                 any/c
                                                 any/c))]
                           [width dimension-integer?]
                           [height dimension-integer?])
           (listof (list/c dimension-integer?
                           dimension-integer?
                           dimension-integer?
                           dimension-integer?))]{

Called to place the children of a container. See @|geomdiscuss|
 for more information.

}


@defmethod[(reflow-container)
           void?]{

When a container window is not shown, changes to the container's
set of children do not necessarily trigger the immediate
re-computation of the container's size and its children's sizes
and positions.  Instead, the recalculation is delayed until the
container is shown, which avoids redundant computations between a
series of changes. The @method[area-container<%>
reflow-container] method forces the immediate recalculation of
the container's and its children's sizes and locations.

Immediately after calling the @method[area-container<%>
reflow-container] method, @method[window<%> get-size],
@method[window<%> get-client-size], @method[window<%> get-width],
@method[window<%> get-height], @method[window<%> get-x], and
@method[window<%> get-y] report the manager-applied sizes and
locations for the container and its children, even when the
container is hidden. A container implementation can call
functions such as @method[window<%> get-size] at any time to
obtain the current state of a window (because the functions do
not trigger geometry management).

See also @method[area-container<%> container-flow-modified].

}

@defmethod[(set-alignment [horiz-align (symbols 'right 'center 'left)]
                          [vert-align (symbols 'bottom 'center 'top)])
           void?]{
Sets the alignment specification for a container, which determines how
 it positions its children when the container has leftover space (when
 a child was not stretchable in a particular dimension).

When the container's horizontal alignment is @racket['left], the
 children are left-aligned in the container and whitespace is inserted
 to the right.  When the container's horizontal alignment is
 @racket['center], each child is horizontally centered in the
 container. When the container's horizontal alignment is
 @racket['right], leftover whitespace is inserted to the left.

Similarly, a container's vertical alignment can be @racket['top],
 @racket['center], or @racket['bottom].

}

@defmethod*[([(spacing)
              spacing-integer?]
             [(spacing [spacing spacing-integer?])
              void?])]{

Gets or sets the spacing, in pixels, used between subareas in the
 container. For example, a vertical panel inserts this spacing between
 each pair of vertically aligned subareas (with no extra space at the
 top or bottom).
}

}

