Point Box::PreferredSize()
{
if (m_children.size() == 0) return Point();
Point::Component vc, fc;
GetComponentsForOrient(m_orient == BOX_HORIZONTAL, vc, fc);
m_preferredSize = Point(0);
m_minAllocation = 0;
m_numVariable = 0;
for (std::list<Child>::iterator i = m_children.begin(); i != m_children.end(); ++i) {
const Point contribSize = (*i).contribSize = CalcLayoutContribution((*i).widget);
// they've asked for as much as possible
if (contribSize[vc] == SIZE_EXPAND) {
// we'll need to be as big as possible too
m_preferredSize[vc] = SIZE_EXPAND;
// count them for later
m_numVariable++;
}
// they asked for a known amount
else {
// if we still know our size then we can increase it sanely
if (m_preferredSize[vc] != SIZE_EXPAND)
// need a bit more
m_preferredSize[vc] += contribSize[vc];
// track minimum known size so we can avoid recounting in Layout()
m_minAllocation += contribSize[vc];
}
// fixed axis should just be as large as our largest
m_preferredSize[fc] = std::max(m_preferredSize[fc], contribSize[fc]);
}
// if there was no variable ones, and thus we're asking for a specific
// amount of space, add sufficient padding
if (m_numVariable == 0)
m_preferredSize[vc] += m_spacing*m_children.size();
return m_preferredSize;
}
Point Expand::PreferredSize()
{
const Point innerPreferredSize(GetInnerWidget() ? CalcLayoutContribution(GetInnerWidget()) : Point());
switch (m_direction) {
case BOTH:
SetSizeControlFlags(EXPAND_WIDTH | EXPAND_HEIGHT);
break;
case HORIZONTAL:
SetSizeControlFlags(EXPAND_WIDTH);
break;
case VERTICAL:
SetSizeControlFlags(EXPAND_HEIGHT);
break;
}
return innerPreferredSize;
}
Point Grid::PreferredSize()
{
Point preferredSize;
for (unsigned int rowNum = 0; rowNum < m_numRows; rowNum++) {
Point rowSize;
for (unsigned int colNum = 0; colNum < m_numCols; colNum++) {
const unsigned int n = rowNum*m_numCols+colNum;
Widget *w = m_widgets[n];
if (!w) continue;
const Point childPreferredSize = CalcLayoutContribution(w);
rowSize.x = SizeAdd(childPreferredSize.x, rowSize.x);
rowSize.y = std::max(childPreferredSize.y, rowSize.y);
}
preferredSize.x = std::max(preferredSize.x, rowSize.x);
preferredSize.y = SizeAdd(preferredSize.y, rowSize.y);
}
return preferredSize;
}
