Delphi Programming Tutorial – Unit 8.5 – Code Shortcuts and Assistance In Delphi

Delphi Tutorial – Unit 8.5 – Code Shortcuts and Assistance In Delphi:

In the previous few tutorials, we learned how to write code for the events of a Delphi object. In this tutorial, we learn how to use some of Delphi’s design time features to help us while writing code in the Code Editor.

You will see how Delphi helps you to remember the names of your objects and how all the properties and methods belonging to those objects are presented to you while typing your code.

We also learn how use short-cuts and keyboard keys to auto complete the code for us.

This will help us to type much faster and it also makes our code less error prone and free from spelling mistakes. This is made possible by forcing us to only use strictly defined names.

We replace the current statement in the Display button’s event handler with three new statements to learn and practise the lessons in this tutorial.

While typing this code the video is paused to explain the different features available for auto-completion. You learn that programmers may sometimes work on other parts of a project for long periods of time, and when it is time to write code for some objects, they tend to forget the names assigned to those objects.

To overcome this problem, you are shown how to use keyboard keys (Control + Space) in conjunction with your naming convention (prefixes) to obtain a list of objects starting with the prefix you typed. The information provided by these lists provide programmers with a vast amount of information, such as names, data types, required parameters, etc.

After programming the new statements in our event handler for the click event of the Display button must be as follows:

procedure TfrmContact.btnDisplayClick(Sender: TObject);
begin
redOutput.Color := clYellow;
frmContact.Caption := ‘Displaying Contact Information’;
redOutput.Lines.Add(‘Displaying Contact Information’);
end;

This code changes the colour of our TRichEdit (named redOutput) to yellow, sets the Caption of our Form (named frmContact) to the phrase “Displaying Contact Information”, and adds a new line to the TRichEdit’s (named redOutput) Lines collection.

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http://www.delphibasics.co.uk http://stackoverflow.com/

Comments

Nikola Milosevic says:

I agree with others, you explain so well! Great job!

Keenan Pillay says:

Thanks so much for the tutorials. I’m learning so much from you :)

James Lucas Gilbert says:

great tutorials! thank you

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