Method HandleMouseMoveEvent

src/SFGUI/Scale.cpp:126–167

}

void Scale::HandleMouseMoveEvent( int x, int y ) {
	if( !m_dragging || ( x == std::numeric_limits<int>::min() ) || ( y == std::numeric_limits<int>::min() ) ) {
		return;
	}

	Adjustment::Ptr adjustment( GetAdjustment() );
	auto slider_rect = GetSliderRect();

	auto value_range = std::max( adjustment->GetUpper() - adjustment->GetLower() - adjustment->GetPageSize(), adjustment->GetMinorStep() / 2.f );
	auto steps = value_range / adjustment->GetMinorStep();

	if( GetOrientation() == Orientation::HORIZONTAL ) {
		auto slider_center_x = GetAllocation().position.x + slider_rect.position.x + slider_rect.size.x / 2.0f;
		auto step_distance = (GetAllocation().size.x - slider_rect.size.x) / steps;
		auto delta = static_cast<float>( x ) - slider_center_x - m_drag_offset->x;

		while( delta < (-step_distance / 2) ) {
			adjustment->Decrement();
			delta += step_distance;
		}

		while( delta > (step_distance / 2) ) {
			adjustment->Increment();
			delta -= step_distance;
		}
	}
	else {
		auto slider_center_y = GetAllocation().position.y + slider_rect.getCenter().y;
		auto step_distance = (GetAllocation().size.y - slider_rect.size.y) / steps;
		auto delta = static_cast<float>( y ) - slider_center_y - m_drag_offset->y;

		while( delta < (-step_distance / 2) ) {
			adjustment->Increment();
			delta += step_distance;
		}

		while( delta > (step_distance / 2) ) {
			adjustment->Decrement();
			delta -= step_distance;
		}
	}
}

const std::string& Scale::GetName() const {
	static const std::string name( "Scale" );