Method startDrag

UnitTests/UnitTest_GraphView/BaseGraphView.h:196–287

		}

		void startDrag(BaseGraphConnection* _connection) override
		{
			if (!mIsDrug)
			{
				bool result = false;
				requestConnectPoint(this, _connection, nullptr, result);

				// тащим новый конект
				if (result)
				{
					mIsDrug = true;

					const MyGUI::IntCoord& coord = _connection->getAbsoluteCoord();

					mDrugLine.colour.set(1, 1, 1, 1);
					mDrugLine.start_offset.clear();
					mDrugLine.end_offset.clear();
					mDrugLine.point_start.set(
						coord.left + (coord.width / 2) - mCanvas->getAbsoluteLeft(),
						coord.top + (coord.height / 2) - mCanvas->getAbsoluteTop());
					mDrugLine.point_end = mDrugLine.point_start;

					mConnectionStart = _connection;

					updateCanvas();
				}
				// разрываем существующий
				else
				{
					BaseGraphConnection* drag_node = nullptr;
					bool disconect = false;
					// прямое сочленение
					if (_connection->isAnyConnection())
					{
						EnumeratorConnection conn = _connection->getConnectionEnumerator();
						while (conn.next())
						{
							result = false;
							requestDisconnectPoint(this, _connection, conn.current(), result);
							if (result)
							{
								drag_node = _connection;
								eventDisconnectPoint(this, _connection, conn.current());
								_connection->removeConnectionPoint(conn.current());
								disconect = true;
							}
							break;
						}
					}
					else
					{
						// обратное сочленение
						EnumeratorConnection conn = _connection->getReverseConnectionEnumerator();
						while (conn.next())
						{
							result = false;
							requestDisconnectPoint(this, conn.current(), _connection, result);
							if (result)