void HKWidgetLayoutLinear::ArrangeChildren()
{
bool bFitWidth = bAutoWidth && GetHAlign() != Align_Fill; // fitFlags & FitContentHorizontal
bool bFitHeight = bAutoHeight && GetVAlign() != VAlign_Fill; // fitFlags & FitContentVertical
// early out?
int numChildren = GetNumChildren();
if(numChildren == 0)
{
if(bFitWidth || bFitHeight)
{
// resize the layout
MFVector newSize = GetSize();
if(bFitWidth)
newSize.x = padding.x + padding.z;
if(bFitHeight)
newSize.y = padding.y + padding.w;
Resize(newSize);
}
return;
}
// calculate weight and fit
float totalWeight = 0.f;
MFVector fit = MakeVector(padding.x + padding.z, padding.y + padding.w);
for(int a=0; a<numChildren; ++a)
{
HKWidget *pWidget = GetChild(a);
if(pWidget->GetVisible() == Gone)
continue;
const MFVector &cSize = pWidget->GetSizeWithMargin();
if(orientation == Horizontal)
{
if(pWidget->GetHAlign() == Align_Fill) // fill horizontally
totalWeight += pWidget->GetLayoutWeight();
else
fit.x += cSize.x;
fit.y = MFMax(fit.y, cSize.y + padding.y + padding.w);
}
else
{
if(pWidget->GetVAlign() == VAlign_Fill) // fill vertically
totalWeight += pWidget->GetLayoutWeight();
else
fit.y += cSize.y;
fit.x = MFMax(fit.x, cSize.x + padding.x + padding.z);
}
}
if(bFitWidth || bFitHeight)
{
// resize the layout
MFVector newSize = size;
if(bFitWidth)
newSize.x = fit.x;
if(bFitHeight)
newSize.y = fit.y;
Resize(newSize);
}
MFVector pPos = MakeVector(padding.x, padding.y);
MFVector pSize = MakeVector(size.x - (padding.x + padding.z), size.y - (padding.y + padding.w));
MFVector slack = MFMax(size - fit, MFVector::zero);
for(int a=0; a<numChildren; ++a)
{
HKWidget *pWidget = GetChild(a);
if(pWidget->GetVisible() == Gone)
continue;
const MFVector &cMargin = pWidget->GetLayoutMargin();
const MFVector &cSize = pWidget->GetSize();
MFVector tPos = pPos + MakeVector(cMargin.x, cMargin.y);
MFVector tSize = MFMax(pSize - MakeVector(cMargin.x + cMargin.z, cMargin.y + cMargin.w), MFVector::zero);
Align align = pWidget->GetHAlign();
VAlign valign = pWidget->GetVAlign();
MFVector newSize = cSize;
if(orientation == Horizontal)
{
if(align == Align_Fill) // fill horizontally
{
// this widget fills available empty space in the parent container
newSize.x = slack.x * (pWidget->GetLayoutWeight() / totalWeight);
pPos.x += newSize.x;
newSize.x = MFMax(0.f, newSize.x - cMargin.x - cMargin.z);
}
else
{
pPos.x += cSize.x + cMargin.x + cMargin.z;
}
switch(valign)
{
case VAlign_None:
case VAlign_Top:
pWidget->SetPosition(tPos);
break;
case VAlign_Center:
pWidget->SetPosition(tPos + MakeVector(0, MFMax(tSize.y - cSize.y, 0.f) * 0.5f));
break;
case VAlign_Bottom:
pWidget->SetPosition(tPos + MakeVector(0, MFMax(tSize.y - cSize.y, 0.f)));
break;
case VAlign_Fill:
pWidget->SetPosition(tPos);
newSize.y = tSize.y;
break;
default:
MFUNREACHABLE;
}
}
else
{
if(valign == VAlign_Fill) // fill vertically
{
// this widget fills available empty space in the parent container
newSize.y = slack.y * (pWidget->GetLayoutWeight() / totalWeight);
pPos.y += newSize.y;
newSize.y = MFMax(0.f, newSize.y - cMargin.y - cMargin.w);
}
else
{
pPos.y += cSize.y + cMargin.y + cMargin.w;
}
switch(align)
{
case Align_None:
case Align_Left:
pWidget->SetPosition(tPos);
break;
case Align_Center:
pWidget->SetPosition(tPos + MakeVector(MFMax(tSize.x - cSize.x, 0.f) * 0.5f, 0));
break;
case Align_Right:
pWidget->SetPosition(tPos + MakeVector(MFMax(tSize.x - cSize.x, 0.f), 0));
break;
case Align_Fill:
pWidget->SetPosition(tPos);
newSize.x = tSize.x;
break;
default:
MFUNREACHABLE;
}
}
ResizeChild(pWidget, newSize);
}
}
