Delphi L01 Intro
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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.
Delphi L01 Intro
- 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 • • • • 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 • • • • • • • • • • 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 • • • • • • ‘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 • • • • • 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
- 11. What’s for today? • • • • • Design timeExecution time (runtime) Event-Driven Programming Your first Project Forms, Buttons ShowMessage
- 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 • • • • • • • Width, Height. Top, left. ‘Hint’ adding & showhint. Visible. Enabled. Font. Color.
- 24. Common Events for all components • • • • • • • 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.
- 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.
- 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. _________________________________ *Delphi is Arabic compatible
- 35. Button Events • • • • • • 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
- 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!