Overview

The Editor is a module which allows to develop logical design graphically. The main workspace of the Editor is a Drawing Area, where the user can create, modify or delete graphical objects which represent a logical structure.

The Editor window is named editor_window and consists of four following objects:

• The Menu bar, named menubar3. It contains of all the functions not involved in creating or deleting of graphical objects. These are the functions to show the user's manual and to close the Editor window. In Table 5.2 there are gathered the visible names of the menu-items (titles), the internal names and the appropriate call-back functions. As one can see the call-back function to editor_close menu-item is a GTK function. Such a call causes that when editor_close is activated given as a parameter to gtk_widget_hide widget is hidden.
• The Tool bar is named toolbar3 and it is divided in two groups described below. Appropriate titles of buttons, names and call-back functions are given in Table 5.3.
  The buttons control pointer behavior. There are four radio-buttons which allows switching between modes: select, properties, create and delete. As they all are radio-buttons only one button is allowed to be pressed at a time. There are no call-back functions for these buttons. It is because theirs states are important to the Osiris and they are red by the Drawing Area call-back functions.

• The Drawing area is named drawingarea and it is detailed described in Section 5.12.2.
• Statusbar that shows messages to inform the user about Editor's actions. It is named editor_status_bar.

Table 5.2: Editor menu, names and call-back functions.

title	name	signal	call-back function
Edit	editor_edit
Close	editor_close	activate	gtk_widget_hide
Help	editor_help
Manual	editor_manual	activate	on_editor_manual_activate

Table 5.3: Editor toolbar, names and call-back functions.

title	name	signal	call-back function
select	select_radiobutton
properties	properties_radiobutton
create	create_radiobutton
delete	delete_radiobutton

As a representation of structured logic, the tree-table representation, described in Chapter 2, is chosen.