Method HandleStateChange

src/SFGUI/ComboBox.cpp:380–452

}

void ComboBox::HandleStateChange( State old_state ) {
	Bin::HandleStateChange( old_state );

	if( GetState() == State::ACTIVE ) {
		SetZOrder( 1 );

		GrabModal();

		m_start_entry = 0;

		float padding( Context::Get().GetEngine().GetProperty<float>( "ItemPadding", shared_from_this() ) );
		const std::string& font_name( Context::Get().GetEngine().GetProperty<std::string>( "FontName", shared_from_this() ) );
		unsigned int font_size( Context::Get().GetEngine().GetProperty<unsigned int>( "FontSize", shared_from_this() ) );
		const sf::Font& font( *Context::Get().GetEngine().GetResourceManager().GetFont( font_name ) );
		const float line_height( Context::Get().GetEngine().GetFontLineHeight( font, font_size ) );

		if( ( GetDisplayedItemCount() > 2 ) && ( GetDisplayedItemCount() < GetItemCount() ) ) {
			float border_width( Context::Get().GetEngine().GetProperty<float>( "BorderWidth", shared_from_this() ) );


			const sf::Vector2f item_size(
				GetAllocation().size.x - 2 * border_width,
				line_height + 2 * padding
			);

			m_scrollbar = Scrollbar::Create( Scrollbar::Orientation::VERTICAL );

			auto offset = ( GetState() == State::ACTIVE ? border_width : 0.f ) + GetAllocation().size.x - padding - line_height;

			m_scrollbar->SetPosition( sf::Vector2f( offset, GetAllocation().size.y + border_width ) );
			m_scrollbar->SetRequisition( sf::Vector2f( GetAllocation().size.x - offset, static_cast<float>( GetDisplayedItemCount() ) * item_size.y - 2.f * border_width ) );

			m_scrollbar->GetAdjustment()->SetPageSize( static_cast<float>( GetDisplayedItemCount() ) );
			m_scrollbar->GetAdjustment()->SetLower( 0.f );
			m_scrollbar->GetAdjustment()->SetUpper( static_cast<float>( GetItemCount() ) );
			m_scrollbar->GetAdjustment()->SetMinorStep( 1.f );
			m_scrollbar->GetAdjustment()->SetMajorStep( 1.f );

			auto weak_this = std::weak_ptr<Widget>( shared_from_this() );

			m_scrollbar->GetAdjustment()->GetSignal( Adjustment::OnChange ).Connect( [weak_this] {
				auto shared_this = weak_this.lock();

				if( !shared_this ) {
					return;
				}

				auto combo_box = std::dynamic_pointer_cast<ComboBox>( shared_this );

				if( !combo_box ) {
					return;
				}

				combo_box->ChangeStartEntry();
			} );

			m_scrollbar->SetZOrder( 2 );