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Fixed what I think are the last of the bugs with laying items out properly within their rect.

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svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=773059
This commit is contained in:
Bill Egert 2008-02-10 01:59:56 +00:00
parent 8917da5723
commit 783872cc77
1 changed files with 17 additions and 10 deletions
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27
layouts/flowlayout.cpp
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@ -1,5 +1,6 @@
/*
* Copyright 2007 by Robert Knight <robertknight@gmail.com>
* Copyright 2008 by William Egert <begert@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License
@ -158,7 +159,6 @@ void FlowLayout::relayout()
//qreal maxItemHeight = 0;
qreal minItemHeight = 0;
int colCnt = 0;
int rowMax = 0;
int rowCnt = 0;
foreach(LayoutItem *item , d->items) {
@ -172,12 +172,7 @@ void FlowLayout::relayout()
item->minimumSize().height() : minItemHeight;
}
if( minItemHeight != 0) {
rowMax = (int)(rectHeight / (minItemHeight + space) );
} else {
kDebug() << "******POSSIBLE DIVIDE BY ZERO: minItemHeight *******";
rowMax = 1;
}
const int rowMax = ( minItemHeight != 0) ? (int)(rectHeight / (minItemHeight + space)) : 1;
if( maxItemWidth == 0) {
kDebug() << "******POSSIBLE DIVIDE BY ZERO: maxItemWidth ********";
@ -185,6 +180,8 @@ void FlowLayout::relayout()
}
// try to use the maxwidth if there is room
// need usedSpace so we don't try to use the leftover
// area of our rect to make a item location.
maxItemWidth += space;
qreal usedSpace = floor( (rectWidth / maxItemWidth ) ) * maxItemWidth;
for(int i = 1; (i <= rowMax) && (colWidth == 0); i++) {
@ -196,11 +193,21 @@ void FlowLayout::relayout()
}
}
//make items fit in available space
//crazy algorithm to make items fit in available space
if( colWidth == 0) {
colCnt = (int)ceil((qreal)(count + (count % 2)) / rowMax);
// These gave me the most trouble and should
// be taken into account if you try and change this:
// - maxRow = 3 with 9 items and 3 columns.
// - maxRow = 5 with 8 items and 3 colums.
const qreal tmp = (qreal)(count + (count % 2)) / rowMax;
if( (tmp - floor(tmp)) > 0.5) {
colCnt = (int)ceil(tmp) + 1;
} else {
colCnt = (int)ceil(tmp);
}
rowCnt = (int)ceil((qreal)count / colCnt);
colWidth = rectWidth / colCnt;
rowCnt = (count + (count % 2)) / colCnt;
rowHeight = rectHeight / rowCnt;
}