This document provides an introduction and overview of an introductory course on event-driven programming and forms using Delphi. The course plan covers the basics of the Delphi integrated development environment, designing forms and using components, handling events and input, working with files and drawing, and instantiating controls at runtime. A brief history of Delphi is also provided, tracing its origins from Pascal through Turbo Pascal to the current version for visual programming.

1. Intro to Event-driven Programming
and Forms with Delphi
L01 - Introduction
Mohammad Shaker
mohammadshakergtr.wordpress.com
Intro to Event-driven Programming and Forms with Delphi
@ZGTRShaker
2010, 2011, 2012

3. About the Course
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Delphi 2007-2009
How to think like a programmer
Test Questions
You need to try your self, otherwise it won’t work out with
you (practice, practice, practice)

4. Course plan
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Introduction to Delphi
Introduction to IDE & Event Driven Programming
StartSaveOpen a project
Form design (designruntime )
Delphi Components
Input Handling
Event handling
Files
Drawing (Canvas, Timer, etc.)
Instantiate Controls at Runtime

5. Delphi History
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‘ALGOL’* the first high-level language
‘ALGOL’* > Pascal ‘Niklaus Wirth’**
the original definition of Pascal was published in 1971.
Pascal becomes the ‘FORMAL’ programming language.
Turbo Pascal 1.0 (November 1983)
Delphi in 1995 Was introduced for ‘Visual Programming’
• *ALGOL: Algorithmic language
• ** Niklaus Wirth: (b. February 15, 1934) is a Swiss computer scientist, best
known for designing Pascal programming language, and for pioneering
several classic topics in software engineering. In 1984 he won the Turing
Award for developing a sequence of innovative computer languages.

6. Delphi History
• Pascal > Delphi
• Borland > Pascal > Compiler > Delphi

7. Differences
• Interface: from “Console” to “Visual”.
• All Applications need Visual Interaction.
• IDE: (Integrated Development Environment)

8. Delphi Preferences & features
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OOP (Object Oriented Programming)
Applications: are build in the form of ‘forms’.
Components
Api functions ‘in Windows’.
10 times faster compiler in comparison to other programming
languages.
– Executive building files (exe) forms.
– No DLL libraries like other programming languages (Dynamic Link
Library)
– Database compatibility.

9. Now, let’s sneak peek

10. Install
CodeGear Delphi

11. What’s for today?
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Design timeExecution time (runtime)
Event-Driven Programming
Your first Project
Forms, Buttons
ShowMessage

12. Design timeExecuting time

13. Programs executing
• Procedural Programming:
– Sequential
• “Event-Driven” Programming:
– Event

14. File Menu
• New > VCL forms Applications
• open
• Save

17. OpenSave a Project
• When saved.
– first, “UNIT” is being saved
– Then, the “PROJECT”
• File > Save as
(Pas file is saved)
• File > Save project as
(dpr is saved)
• “exe.” file is formed in running time.

19. Object inspector

20. Object inspector
• Properties: like width, color, etc.
• Events: like pressing buttons, moving mouse, etc.

21. Properties

22. Events

23. Common Properties for all components
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Width, Height.
Top, left.
‘Hint’ adding & showhint.
Visible.
Enabled.
Font.
Color.

24. Common Events for all components
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Onclick
OnDoubleClick
OnMouseMove
OnDragDrop
OnCreate
OnClose
Rest of them

25. Note that
• All the above properties & events can be modified at design
time or runtime.

26. Event Handling
Live Example

27. Tool palette.. components

28. Tabs

29. Forms
Windows Applications  forms
Every “form” has a corresponding “unit”

30. Forms properties
• All the following properties are ‘boolean’s:
– BiSystemMenu:
• All three buttons disappear.
– BiMinimize:
• to taskbar minimization.
– BiMaximize:
• resize button.
– BiHelp:
• ’?’ button.
• Position: the place the form will appear on the screen.
• Icon: the style of the form’s icon.
– You can browse it from your PC images & pics.

31. Forms events
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OnClose
OnMouseClick
OnHold
OnCreate
OnResize
OnMouseWheelUp

32. Buttons
• Adding a button to our project

33. Button properties
• Name: the one we use in code (we can’t write in Arabic here.)
• Caption: the “Visual” name that will appear to the client. (we can
write in Arabic here) *
• Topleft: parametric variables indicate the position of the
component in the form.
• Fonts: colorvolume & type of the written “Caption” design.
• Hint: showing a ‘hint’ when the cursor (mouse) stop on the ‘button’.
• Show Hint: shows the written hint above.
• Visible  Enabled
• Tab Order
• etc.
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*Delphi is Arabic compatible

34. Button Events
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OnClick
OnMouseMove
OnKeyPress
etc.

35. Button Events
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Let’s have a quick sneak on the code
Create a new form
Place a “Button” named “KeKe” in it.:D
Double click on the button
See where you are now
Test it

36. ShowMessage
Ctrl + Space

37. Button Events
Events + Properties

40. Test it
Before Clicking
After Clicking

41. ShowMessage
• The name of the application's executable file appears as the
“caption” of the message box.
• Msg parameter is the message string that appears in the
message box.
• Code example:
Var worked:boolean;
If (not(Worked)) then
ShowMessage (‘Cmon
Work ’);

43. ShowMessage
procedure TForm1.Button1Click(Sender: TObject);
var b: boolean;
begin
b:= false;
if (not(b)) then
begin
ShowMessage('Hi There ');
end;
end;

44. ShowMessage
After clicking the button

45. References
• ‘Delphi’ Help
• Delphibasics.co.uk
• Delphi Books

46. See you!