You have to create an event handler method and assign it to the event property. Create a component (or more components) visually and set its properties. Select one or more components and execute GExperts, Components to Code. Paste the generated code into your application.
How do you create a component in Delphi?
Choose Component > New Component. Choose File > New > Other, go to the Delphi Projects > Delphi Files page and double-click Component….The New Component wizard performs the same tasks you would when creating a component manually:
- Creating a unit.
- Deriving the component.
- Registering the component.
What is a dynamic component Delphi?
Dynamic Component Creation This is a common practice when building composite components where a visual container creates and owns the subcomponents. The Create constructor is a class method, as opposed to virtually all other methods you’ll encounter in Delphi programming, which are object methods.
What is a component in Delphi?
Building components is an important activity for Delphi programmers. Basically, any time you need the same behavior in two different places in an application, or in two different applications, you can place the shared code in a class—or, even better, in a component.
How do I create a class in Delphi?
Defining New Classes (Delphi)
- In the IDE, start with a project open and choose File > New > Unit to create a new unit where you can define the new class.
- Add the uses clause and type section to the interface section.
- In the type section, write the class declaration.
What is a tab in Delphi?
The TPageControl Delphi control displays a set of pages used to make a multiple-page dialog box. Each page — a tab sheet — hosts its own controls. The user selects a page (makes it visible) by clicking the page’s tab that appears at the top of the control.
What is a GUI Delphi?
GUI stands for Graphical User Interface. It refers to the windows, buttons, dialogs, menus and everything visual in a modern application. Delphi lets you build powerful applications using a rich variety of these components.
What are methods in Delphi?
In Delphi, a method is a procedure or function that performs an operation on an object. A class method is a method that operates on a class reference instead of an object reference.
How do I set tabs in Delphi?
The tab order is initially set by Delphi, corresponding to the order in which you add components to the form. You can change this by changing the TabOrder property of each component, or by using the Edit Tab Order dialog box.
The Create constructor is a class method, as opposed to virtually all other methods you’ll encounter in Delphi programming, which are object methods. For example, the TComponent declares the Create constructor as follows: The second way to create a component is to use nil as the owner.
What is the Create constructor in Delphi?
The Create constructor is a class method, as opposed to virtually all other methods you’ll encounter in Delphi programming, which are object methods. For example, the TComponent declares the Create constructor as follows:
How do I dynamically instantiate a Delphi component?
If you want to dynamically instantiate a Delphi component and explicitly free it sometime later, always pass nil as the owner. Failure to do so can introduce unnecessary risk, as well as performance and code maintenance problems. Read the “A warning on dynamically instantiating Delphi components” article to learn more…
How do I create an instance of a class in Delphi?
To create an instance (object) of a class, you call its “Create” method. The Create constructor is a class method, as opposed to virtually all other methods you’ll encounter in Delphi programming, which are object methods. For example, the TComponent declares the Create constructor as follows: constructor Create (AOwner: TComponent) ; virtual;
