Learn Delphi Programming | Unit 8.4 | Changing Properties In Delphi Code

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Delphi Programming Tutorial – Unit 8.4 – Changing Properties In Delphi Code:

In this tutorial we learn how to change properties in run-time, in other words, how to write code to enable our users to change properties while a program is running. We first have a brief look at some of the properties provided by the Object Inspector. These include:

Dimensional properties (To set the size of a component) i.e. Width and Height;

Positional properties (To set the location/position of a component) i.e. Top and Left.

Visual properties (To set the look-and-feel of a component) i.e. Color, Caption, Text, Visible, Enabled.

We then look at basic property assignment statements in Delphi code and we dissect the structure of general property assignments in code. We use an assignment operator (:=) to make property changes in Delphi code. This tutorial demonstrates these concepts with the Width, Left, and Caption properties of a TButton, but these concepts can be applied to most properties of almost any Delphi object that has properties. We also learn about the semi-colon as a statement terminator.

The tutorial explains the types of values that can be assigned to the objects used in the different examples i.e. Integer (whole number), Integer expressions (calculations with whole numbers), String, String expressions (joining strings / concatenating strings), Boolean (true or false values), constants (predefined values). We also learn a handy trick to make it easy to read assignment statements by reading them from right to left.

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