What is the DelphiVCL.Application.OnActionExecute Event?
The OnActionExecute or DelphiVCL.Application.OnActionExecute event occurs for Windows app development when an action’s Execute method is called and its action list has not already handled it.
Use the OnActionExecute event handler to respond when a user invokes actions whose action lists do not have OnExecute event…
OnModalBegin or DelphiVCL.Application.ModalBegin occurs when a modal form is opened.
Write an OnModalBegin event handler to perform special processing when a modal form is opened.
How to examine the properties, methods, and built-in properties of the…
Whenever object-oriented programming is done in Python, then we will often come across the self method as their first parameter. This article explains the main concept of self method in Python for Windows development.
self represents the instance of the class in Python.
In Delphi VCL, TColor is used to specify the color of a control. It only works for development on Windows.
TColor is used to specify the color of a Windows-only control. It is used by the Color property of many components and by many other properties that specify color values.
The Graphics unit contains definitions of useful constants for TColor. These constants map either directly to the…
For Windows app development the BringToFront method or DelphiVCL.Application.BringToFront sets the last active window as the topmost window on the desktop above all other applications.
Use BringToFront to find the window owned by the MainForm that was last active and…
The ClassParent method or DelphiVCL.Application.ClassParent is used during Windows app development to return the type of the immediate ancestor of a class.
ClassParent returns the name of the parent class for an object instance or class reference. For TObject, ClassParent…
The Components property or DelphiVCL.Application.Components in Windows app development is used to list all components owned by the component. Of then this is used to programmatically iterate through all the components on a form or panel in order to update them in some way.
Use Components to access any of the components owned by this component or form. The Components property is most useful when…
The DelphiVCL CleanupInstance method or DelphiVCL.Application.CleanupInstance is used to perform finalization on long strings, variants, and interface variables within a class.
Do not call CleanupInstance directly. CleanupInstance is called automatically when the object…
Before you download an app (not just one written with a Python IDE) or run a file such as a CMD script, it is important to know that the file itself is secured and safe. We do not want any harmful viruses to ruin our computer or hack all our private information. To prevent…
OnMinimize or DelphiVCL.Application.OnMinimize occurs when a Python GUI DelphiVCL application is minimized.
Write an OnMinimize event handler to perform special processing when the application is minimized. The application is minimized either because the user minimizes the main window or because of a call to the Minimize method. The Icon property determines the icon that represents the…
