The ComponentCount property or DelphiVCL.Application.ComponentCount is used to indicate the number of components owned by the component.
Use the ComponentCount property to determine the number of components owned by a component, for example, when iterating through the components list to perform an action on all owned components. The ComponentCount property equals the number of items in the…
The ComObject property or DelphiVCL.Application.ComObject is used to specify the interface reference implemented by the component.
Use ComObject to assign a COM interface implemented by a component to an interface reference. This property is used by components that…
Text property contains a text string associated with the control.
We use the Text property to read the Text of the control or to specify a new string for the Text value. By default, Text is the control name. For edit controls and memos, the Text appears within the…
The ClassType method or DelphiVCL.Application.ClassType is used to return the class reference for the object’s class.
Note: ClassType dynamically determines the type of an object and returns its class reference, or metaclass.
Avoid using ClassType in application code.
Let’s browse all the properties, methods, and built-in properties of the…
The ClassName method or DelphiVCL.Application.ClassName is used to return a string indicating the type of the object instance (as opposed to the type of the variable passed as an argument).
Use ClassName to obtain the class name from an object instance or class…
The ClassInfo method or DelphiVCL.Application.ClassInfo is used to return a pointer to the run-time type information (RTTI) table for the object type.
ClassInfo provides access to the RTTI table for a given object type.
Some classes do not provide run-time type…
The CancelHint method or DelphiVCL.Application.CancelHint is used to cancel the display of a hint for a control.
Applications rarely, if ever, call CancelHint directly. CancelHint is used internally to cancel the display of hints at appropriate times, such as when a window is not valid or when the application closes. CancelHint calls a series of routines that clean up the display and timing…
We use Caption to specify a text string that identifies the control to the user.
To underline a character in a Caption that labels a component, include an ampersand (&) before the character. This type of character is called an accelerator character. The user can…
We use the Parent property to get or set the parent of the control. The parent of a control is the control that contains it. For example, if an application includes three radio buttons in a group box, the group box is the parent of the three radio buttons, and the radio…
We use TextRect to write a string inside a clipping rectangle or within a limited rectangular region. Any portions of the string that fall outside the rectangle passed in the Rect parameter are clipped and don’t appear. The upper left corner of the text is placed at the point (X, Y).
Here is the working example of the implementation of an OnClose event like in the Section 7 (Getting…
