Windows

In Windows application development the OnMessage or DelphiVCL.Application.OnMessage occurs when the application receives a message from either the Windows operating system or another application. How to use the DelphiVCL.Application.OnMessage event properly? We use the OnMessage to trap any or all Windows messages posted to all windows in the application. The OnMessage event occurs when an…

In windows app development, the Observers or DelphiVCL.Application.Observers property indicates the TObservers object added to the TComponent. Observers is a read-only property that returns the TObservers added to the TComponent, in order to use the notifications provided by the observers either with LiveBindings or for the developers’ own purposes. Let’s browse all the properties…

During Windows development, the OnIdle or DelphiVCL.Application.OnIdle occurs when an application becomes idle. Write an OnIdle event handler to perform special processing when an application is idle. An application is idle when it is not processing code. For example, an application is idle when it is waiting for input from the user. OnIdle is called only once, as the application transitions…

What is the DelphiVCL.Application.OnHelp event? The OnHelp or DelphiVCL.Application.OnHelp occurs when the application receives a request for Help. You can examine and set it in the IDE software. How to use the DelphiVCL.Application.OnHelp event properly? Write an OnHelp event handler to perform special processing when the user requests Help. The HelpContext and HelpJump methods…