bool UIHorizontalLayout::internalUpdate()
{
UIWidgetPtr parentWidget = getParentWidget();
if(!parentWidget)
return false;
UIWidgetList widgets = parentWidget->getChildren();
if(m_alignRight)
std::reverse(widgets.begin(), widgets.end());
bool changed = false;
Rect paddingRect = parentWidget->getPaddingRect();
Point pos = (m_alignRight) ? paddingRect.topRight() : paddingRect.topLeft();
int preferredWidth = 0;
int gap;
for(const UIWidgetPtr& widget : widgets) {
if(!widget->isExplicitlyVisible())
continue;
Size size = widget->getSize();
gap = (m_alignRight) ? -(widget->getMarginRight()+widget->getWidth()) : widget->getMarginLeft();
pos.x += gap;
preferredWidth += gap;
if(widget->isFixedSize()) {
if(widget->getTextAlign() & Fw::AlignTop) {
pos.y = paddingRect.top() + widget->getMarginTop();
} else if(widget->getTextAlign() & Fw::AlignBottom) {
pos.y = paddingRect.bottom() - widget->getHeight() - widget->getMarginBottom();
pos.y = std::max<int>(pos.y, paddingRect.top());
} else { // center it
pos.y = paddingRect.top() + (paddingRect.height() - (widget->getMarginTop() + widget->getHeight() + widget->getMarginBottom()))/2;
pos.y = std::max<int>(pos.y, paddingRect.top());
}
} else {
// expand height
size.setHeight(paddingRect.height() - (widget->getMarginTop() + widget->getMarginBottom()));
pos.y = paddingRect.top() + (paddingRect.height() - size.height())/2;
}
if(widget->setRect(Rect(pos - parentWidget->getVirtualOffset(), size)))
changed = true;
gap = (m_alignRight) ? -widget->getMarginLeft() : (widget->getWidth() + widget->getMarginRight());
gap += m_spacing;
pos.x += gap;
preferredWidth += gap;
}
preferredWidth -= m_spacing;
preferredWidth += parentWidget->getPaddingLeft() + parentWidget->getPaddingRight();
if(m_fitChildren && preferredWidth != parentWidget->getWidth()) {
// must set the preferred width later
g_dispatcher.addEvent([=] {
parentWidget->setWidth(preferredWidth);
});
}
return changed;
}
