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/*
* RTFL
*
* Copyright 2013-2015 Sebastian Geerken <sgeerken@dillo.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version; with the following exception:
*
* The copyright holders of RTFL give you permission to link this file
* statically or dynamically against all versions of the graphviz
* library, which are published by AT&T Corp. under one of the following
* licenses:
*
* - Common Public License version 1.0 as published by International
* Business Machines Corporation (IBM), or
* - Eclipse Public License version 1.0 as published by the Eclipse
* Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "vbox.hh"
#include "lout/misc.hh"
using namespace dw::core;
using namespace lout::misc;
namespace rtfl {
namespace dw {
int VBox::CLASS_ID = -1;
VBox::VBox (bool stretchChildren): Box (stretchChildren)
{
DBG_OBJ_CREATE ("rtfl::dw::VBox");
registerName ("rtfl::dw::VBox", &CLASS_ID);
}
VBox::~VBox ()
{
DBG_OBJ_DELETE ();
}
int VBox::findFirstVisibleChild ()
{
for (int i = 0; i < children->size (); i++) {
Requisition childReq;
children->get(i)->sizeRequest (&childReq);
if (childReq.ascent > 0 || childReq.descent > 0)
return i;
}
return 0;
}
void VBox::sizeRequestImplImpl (Requisition *requisition)
{
actualSizeRequestImplImpl (requisition, findFirstVisibleChild ());
}
void VBox::sizeAllocateImpl (Allocation *allocation)
{
// TODO "stretchChildren" is not regarded.
Allocation allocWOBorders;
allocWOBorders.x = allocation->x + getStyle()->boxOffsetX ();
allocWOBorders.y = allocation->y + getStyle()->boxOffsetY ();
allocWOBorders.width = allocation->width - getStyle()->boxDiffWidth ();
allocWOBorders.ascent = allocation->ascent - getStyle()->boxOffsetY ();
allocWOBorders.descent = allocation->descent - getStyle()->boxRestHeight ();
// Unlike HBox, the ascent of the first visible widget (set as
// allocation ascent) is treated differently; the distribution is
// only done for the rest. Also, the difference is distributed to
// ascent (except first widget) and descent independently.
int sumReqHeight = 0, firstVisibleChild = findFirstVisibleChild ();
for (int i = firstVisibleChild; i < children->size (); i++) {
Requisition childReq;
children->get(i)->sizeRequest (&childReq);
if (i > firstVisibleChild)
sumReqHeight += childReq.ascent;
sumReqHeight += childReq.descent;
}
//bool stretch = stretchChildren && sumReqHeight < allocWOBorders.descent;
// Cf. doc/rounding-errors.doc, with: x[i] = child requisition,
// y[i] = child allocation, a = total allocation, b = sumReqHeight.
int cumChildReqHeight = 0, cumChildAllocHeight = 0;
for (int i = 0; i < children->size (); i++) {
Widget *child = children->get (i);
Requisition childReq;
child->sizeRequest (&childReq);
Allocation childAlloc;
childAlloc.x = allocWOBorders.x;
childAlloc.width = allocWOBorders.width;
if (i == firstVisibleChild) {
childAlloc.y = allocWOBorders.y;
childAlloc.ascent = allocWOBorders.ascent;
} else {
childAlloc.y =
allocWOBorders.y + allocWOBorders.ascent + cumChildAllocHeight;
cumChildReqHeight += childReq.ascent;
childAlloc.ascent = sumReqHeight > 0 ?
safeATimesBDividedByC (cumChildReqHeight, allocWOBorders.descent,
sumReqHeight) - cumChildAllocHeight :
0;
cumChildAllocHeight += childAlloc.ascent;
}
cumChildReqHeight += childReq.descent;
childAlloc.descent = sumReqHeight > 0 ?
safeATimesBDividedByC (cumChildReqHeight, allocWOBorders.descent,
sumReqHeight) - cumChildAllocHeight :
0;
cumChildAllocHeight += childAlloc.descent;
child->sizeAllocate (&childAlloc);
//printf ("vbox: %dth child at (%d, %d), %d, (%d x %d)\n",
// i, childAlloc.x, childAlloc.y, childAlloc.width,
// childAlloc.ascent, childAlloc.descent);
}
}
void VBox::accumulateSize (int index, int size, Requisition *totalReq,
Requisition *childReq, int data1)
{
int firstVisibleChild = data1;
totalReq->width = max (totalReq->width, childReq->width);
if (index == firstVisibleChild) {
// Resulting baseline is the baseline of the first child.
totalReq->ascent = childReq->ascent;
totalReq->descent = childReq->descent;
} else
totalReq->descent += (childReq->ascent + childReq->descent);
}
void VBox::accumulateExtremes (int index, int size, Extremes *totalExtr,
Extremes *childExtr)
{
totalExtr->minWidth = max (totalExtr->minWidth, childExtr->minWidth);
totalExtr->maxWidth = max (totalExtr->maxWidth, childExtr->maxWidth);
}
} // namespace rtfl
} // namespace dw
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