sf::Vector2f Widget::GetAbsolutePosition() const {
// If no parent, allocation's position is absolute position.
PtrConst parent( m_parent.lock() );
if( !parent ) {
return sf::Vector2f( GetAllocation().Left, GetAllocation().Top );
}
// Get parent's absolute position and add own rel. position to it.
sf::Vector2f parent_position( parent->GetAbsolutePosition() );
return sf::Vector2f(
parent_position.x + GetAllocation().Left,
parent_position.y + GetAllocation().Top
);
}
void GLCanvas::HandleAbsolutePositionChange() {
sf::Vector2f position = Widget::GetAbsolutePosition();
Container::PtrConst parent = GetParent();
sf::Vector2f parent_position( 0.f, 0.f );
while( parent ) {
if( parent->GetName() == "Viewport" ) {
// Try to get the first ancestor of the viewport that is not a viewport itself.
// Add up all allocations while searching.
Container::PtrConst viewport_parent = parent->GetParent();
while( viewport_parent && viewport_parent->GetName() == "Viewport" ) {
parent_position += sf::Vector2f( viewport_parent->GetAllocation().left, viewport_parent->GetAllocation().top );
viewport_parent = viewport_parent->GetParent();
}
if( !viewport_parent || ( viewport_parent->GetName() == "Viewport" ) ) {
parent_position = sf::Vector2f( 0.f, 0.f );
break;
}
parent_position += viewport_parent->GetAbsolutePosition();
parent_position += sf::Vector2f( parent->GetAllocation().left, parent->GetAllocation().top );
break;
}
parent = parent->GetParent();
}
m_custom_viewport->SetDestinationOrigin(
sf::Vector2f(
std::floor( parent_position.x + position.x + .5f ),
std::floor( parent_position.y + position.y + .5f )
)
);
Invalidate();
}
