Explore the practical implementation of the MVC pattern in MetaTrader 5, focusing on the separation of code into Model, View, and Controller components. The article introduces the Model as the decision-making core, processing input data and maintaining independence from frequent changes. The View handles visualization, showcasing how data is represented on charts. The Controller bridges the user interaction with the Model and View, ensuring smooth data flow and integrity. Learn how to manage input parameters effectively, validate them, and design interfaces that facilitate seamless information exchange between components. Discover the potential for expanding functionalities, adhering to best practices in code organization, and enhancing the robustness of trading applications.

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Programming architecture ensures reliability and scalability. The Model-View-Controller (MVC) pattern helps in organizing code into three components: model (data and logic), view (presentation), and controller (user interaction). Applying MVC in MQL5 for table models enhances clarity and maintenance.

Create classes for table elements—cells, rows, and models—utilizing linked lists for efficient data storage. The CList class in MQL5 facilitates moving and managing rows and cells dynamically, crucial for file operations. Implement an inherited CList class to enable file-based operations and object creation through the CreateElement() method. This approach allows the architecture to adapt as applications grow, ensuring structure and flexibility.

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Explore the intricate process of developing a robust View component in the MVC paradigm using MQL5. The article delves into constructing a foundational object for canvas drawing that ensures dynamic visual elements in algorithmic trading platforms. It presents essential classes managing diverse functionalities like color transitions, rectangle control, and dual-layer graphics, thereby simplifying dynamic resizing and user interaction. This structured approach, while setting the stage for streamlined future integrations with Model and Controller components, enhances flexibility and scalability in building complex graphical interfaces, like tables, and control elements, crafting a precise and efficient development path for traders and developers alike.

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The development and refinement of the Table View control in the MVC paradigm has led to significant advancements in both the Model and View components. Initial efforts focused on creating a foundational object for graphical elements. Progress is now moving towards simple controls, which will eventually be used as components for more complex UI elements. These controls will enable interactivity, essential for the Controller component, thanks to MQL’s integrated event model.

The Base class is being refined for graphical objects by organizing event handling to connect the View and Controller components. This involves refining classes, macros, and enumerations, primarily focusing on the base graphical element object. The implementation includes methods for file operations, refining object descriptors, and utilizing efficient event-driven logic.

Auxiliary classes...

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In the latest article, the MetaTrader 5 library has been expanded to include refined MVC-based table classes, focusing on integrating the View component with the existing Model. The development introduces several classes like Table, Row, Cell, and Header, each interacting with the Panel object for graphical representation. Through these enhancements, the table model now seamlessly links with its visual counterpart, facilitating efficient data handling and display.

The approach employs CBound and CCanvas objects, allowing precise control over drawing coordinates and object sizes. This innovative setup simplifies table cell management, supporting features like sorting and repositioning. The refined structure ensures flexibility and maintains the integrity of graphical elements.

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The recent work on MQL5's table functionality focuses on enhancing user control and data manipulation. Key updates include refining existing library classes to adjust column widths, set data types, and enable sorting by columns. This approach aligns with the MVC paradigm, allowing seamless interaction between the Model, View, and Controller components.

Enhancements in class files enhance sorting by implementing macro substitutions for index-based sorting and refining the Compare() method in CTableRow. Additionally, new methods facilitate working with table columns, including setting display flags and sorting data by column and direction.

Refinements in base and graphical element classes address tooltip functionality, handling cursor coordinates, preventing errors linked to object deletion, and ensuring better management of UI element visibility relative to t...

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