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/* -*-objc-*-
GSAutoLayoutProportionalManager.h
Copyright (C) 2002 Free Software Foundation, Inc.
Author: Nicola Pero <n.pero@mi.flashnet.it>
Date: April 2002
This file is part of GNUstep Renaissance
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; see the file COPYING.LIB.
If not, write to the Free Software Foundation,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _GNUstep_H_GSAutoLayoutProportionalManager
#define _GNUstep_H_GSAutoLayoutProportionalManager
#include "GSAutoLayoutManager.h"
/*
* GSAutoLayoutProportionalManager objects are layout managers which
* layout segments over an invisible grid. The distance between two
* grid lines is called the 'grid unit'. Each segment is required to
* cover 'unit' grid units; the grid unit must be big enough that all
* segments display their `minimum length'. The alignment flags of
* segments are ignored ... because all segments are always expanded.
* The borders of segments are instead used - when the segment
* contents are laid out inside a segment, it takes up all space
* except for the borders. All lines must contain the same number of
* grid units. If the segments in a line sum up to use less grid
* units than the segments in another line, those grid units are left
* blank (the idea being that you can then add an element at the end
* of one line, but not the other ones ... the other ones will still
* be bigger, but display blank there).
*/
@interface GSAutoLayoutProportionalManager : GSAutoLayoutManager
{
float _minimumGridUnit;
float _gridUnit;
}
/*
* The minimum layout is determined by determining the minimum grid
* unit necessary to display all segments. For each segment, the
* minimum grid unit necessary to display that segment is obtained by
* dividing the minimum length of the segment for the span of the
* segment (which is the number of grid units the segment should
* span). The maximum of all these numbers if the minimum grid unit
* needed to display everything comfortably. Once the minimum grid
* unit has been determined, the segments are laid out one after the
* other (on each line), to take up a size given by multiplying the
* minimum grid unit for the span of that segment.
* The length of each line is computed; the maximum of these lengths
* is used as the minimum line length.
* The segment contents are laid out in segments to take all available
* space in the segments, except for the border.
*/
- (BOOL) internalUpdateMinimumLayout;
/*
* The layout is determined by computing the number of grid units in a
* line (got by dividing the _minimumLength by the _minimumGridUnit).
* The _length is divided by this number to get the _gridUnit.
* Layout is computed basing on this _gridUnit - all segments have their
* layout computed by laying them out one after the other one, and sizing
* them to cover `span' grid units each.
* The segment contents are laid out in segments to take all available
* space in the segments, except for the border.
*/
- (BOOL) internalUpdateLayout;
@end
#endif
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