Method AllocateChildren

src/SFGUI/Box.cpp:176–232

}

void Box::AllocateChildren() const {
	unsigned int num_expand( 0 );
	unsigned int num_visible( 0 );

	// Count number of visible and expanded children.
	for( const auto& child : m_box_children ) {
		if( !IsChildInteresting( child.widget ) ) {
			continue;
		}

		++num_visible;

		if( child.expand ) {
			++num_expand;
		}
	}

	// Calculate extra width pre expanded widget.
	float extra( 0.f );

	if( num_expand > 0 ) {
		if( m_orientation == Orientation::HORIZONTAL ) {
			extra = std::max( 0.f, GetAllocation().size.x - GetRequisition().x ) / static_cast<float>( num_expand );
		}
		else {
			extra = std::max( 0.f, GetAllocation().size.y - GetRequisition().y ) / static_cast<float>( num_expand );
		}
	}

	// Allocate children.
	float gap( Context::Get().GetEngine().GetProperty<float>( "Gap", shared_from_this() ) );
	sf::Vector2f allocation( 0.f, 0.f );
	sf::Vector2f position( gap, gap );

	for( const auto& child : m_box_children ) {
		if( !IsChildInteresting( child.widget ) ) {
			continue;
		}

		if( m_orientation == Orientation::HORIZONTAL ) {
			allocation.x = child.widget->GetRequisition().x + ( child.expand ? extra : 0.f );
			allocation.y = GetAllocation().size.y - 2 * gap;

			child.widget->SetAllocation( sf::FloatRect( position, { allocation.x - ( child.expand && !child.fill ? extra : 0.f ), allocation.y }) );
			position.x += allocation.x + GetSpacing();
		}
		else {
			allocation.x = GetAllocation().size.x - 2 * gap;
			allocation.y = child.widget->GetRequisition().y + ( child.expand ? extra : 0.f );

			child.widget->SetAllocation( sf::FloatRect( position, { allocation.x, allocation.y - ( child.expand && !child.fill ? extra : 0.f ) }) );
			position.y += allocation.y + GetSpacing();
		}

		--num_visible;
	}
}