1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* -*-objc-*-
GSAutoLayoutStandardManager.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_GSAutoLayoutStandardManager
#define _GNUstep_H_GSAutoLayoutStandardManager
#include "GSAutoLayoutManager.h"
@class NSMutableArray;
/*
* GSAutoLayoutStandardManager objects are layout managers which
* layout segments one after the other. Some segments are expanded,
* other segments are not expanded. The standard autolayout manager
* guarantees that whenever there is a resize, all segments with
* expand = YES are expanded, and that no segments with expand = NO
* are expanded unless there is a sound reason to do so. This
* autolayout manager aligns segments in different lines, so that
* segment 0 of one line is the same size of segment 0 of all other
* lines. By default, all 'span' attributes of all segments should be
* 1. If a 'span' attribute of a segment is different from 1, it is
* interpreted as the number of slots (columns if we are laying out
* horizontally) that the segment takes up.
*/
@interface GSAutoLayoutStandardManager : GSAutoLayoutManager
{
/* An array of GSAutoLayoutManagerColumn (a private class) holding
* the info about the columns. */
NSMutableArray *_columns;
/* Cached number of columns with expand set to YES. Computed during
* minimum layout. */
int _numberOfExpandingColumns;
}
/*
* The minimum layout is determined by
*
* - finding how many columns we have.
*
* - compute the length of each column, which is the maximum length of
* all segments contained in each column (ignoring the special case of
* segments with span != 1 for now), and whether each column expands
* or not (it expands if any of the segments displayed in it expands).
*
* - for each segment which has a span != 1, if the sum of the length
* of columns it spans is less than the minimum size of the segment,
* then enlarge all those columns so that their sum get to this
* minimum length (only enlarge columns with expand = YES and all of
* the same amount; if there is none with expand = YES, expand all of
* an equal amount); if the segment has expand = YES and no column
* it spans is already marked as expand = YES, then mark them all as
* expand = YES.
*
* - layout each line by laying out all segments in a column to be as
* big as that column, and segments spanning multiple columns to be as
* big as the sum of those columns. All segments are one after the
* other one.
*
* - the biggest line length is the line length.
*
* - layout the segment contents inside each segment according to the
* border for that segment, and the alignment of the segment contents.
*/
- (BOOL) internalUpdateMinimumLayout;
/*
* The layout is determined by computing the difference between the
* _length and the _minimumLength, and distributing the resulting
* amount between the columns with expand = YES, then performing
* layout.
*/
- (BOOL) internalUpdateLayout;
@end
#endif
|
