Advantages of using inheritance
Using inheritance has a number of advantages:
-
When you change the ancestor window,
the changes are reflected in all descendants of the window. You
do not have to make changes manually in the descendants as you would
in a copy. This saves you coding time and makes the application
easier to maintain. -
Each descendant inherits the ancestor’s
scripts, so you do not have to re–enter the code to add
to the script. -
You get consistency in the code and in the application
windows.
When you use inheritance to build an object, everything in
the ancestor object is inherited in all its descendants. In the
descendant, you can:
-
Change
the properties of the window -
Add controls to the window and modify existing controls
-
Size and position the window and the controls in
the window -
Build new scripts for events in the window or its
controls -
Reference the ancestor’s functions and
events -
Reference the ancestor’s structures if
the ancestor contains a public or protected instance variable of
the structure data type -
Access ancestor properties, such as instance variables,
if the scope of the property is public or protected -
Extend or override inherited scripts
-
Declare functions, structures, and variables for
the window -
Declare user events for the window and its controls
The only thing you cannot do is delete inherited controls. If you do not need an inherited
control, you can make it invisible in the descendent window.