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Title: GTK Approach Note

Title: GTK Approach Note



Description:1. Introduction This paper discusses a design strategy used for development of UI for a simulator in Linux in an Object Oriented Environment. The Simulator simulates devices, maintains system state, logs events and communicates through a socket with controller software. The simulator code already had a UI developed for Windows and the task was to incorporate the GTK based Linux UI into the existing source code. The Windows based UI and the Linux based UI had to have same look and feel and same number of input and output fields.

1.1 Purpose

The purpose of this paper is to share a design idea with GTK users in a OOP environment. GTK supports C routines and requires use of different approach for incorporating it into an object oriented design.

2. Procedures and Processes

Windows based GUI was designed to have a Property Page style with each device contained in a property page. MFC classes CPropertyPage and CpropertySheet were used to design the property sheets. The property pages were dependent on the number of devices present in the machine configuration. The Property sheet was created on application start up and based on the device configuration, pages were added and a data structure holding reference to these pages were maintained. Messages from the framework were passed on to the UI through this data structure.

The criteria for UI design in Linux were that the existing code structure and procedure for creation of property pages and sheets should not be changed. The UI module had to be a stand alone piece of code that can be plugged into the main framework when required.

GTK APIs was used to create the UI in Linux. All components in GTK are classified as widgets and using the respective API call, a widget can be used as a button, edit-box, drawing area etc. GTK provides a widget called Notebook which is similar to Property Sheet in Windows. But the API doesnt provide a separate class for the pages of the Notebook.

To overcome this problem, we have used a widget container. The containers we chose were forms. The form holds other widgets like edit-boxes or buttons. The coordinates and size of these components can also be specified on a form.

The design involved creating a new form for each device in the configuration. A data structure with reference to these devices needed to be maintained. This was done by encapsulating the GTK widgets into a class. Based on the number of devices, a new class was derived from this class. Once created, each device UI class would be added as a page to the GTK Notebook, which is also encapsulated into a different class which handles tab selection and UI shutdown. The blue line indicates classes derived. The green line indicates the communication between the 2 objects

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