What is the DelphiVCL.Application.OnHint event?
The OnHint or DelphiVCL.Application.OnHint occurs when the mouse pointer moves over a control or menu item that can display a Help Hint. This mainly applies to Windows app development.
How to use the DelphiVCL.Application.OnHint event properly?
Write an OnHint event handler to perform special processing when the mouse pauses over a control…
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…
The NormalizeAllTopMosts or DelphiVCL.Application.NormalizeAllTopMosts method is used in development on Windows to make forms that have been designated as topmost forms (their FormStyle is fsStayOnTop) behave as if they were not topmost forms.
How to use the…
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…
A built-in function object is a wrapper around a C function. Examples of built-in functions are len() and math.sin() (math is a standard built-in module). The number and type of the arguments are determined by the C function.
You can browse all the built-in function…
The OnException or DelphiVCL.Application.OnException event occurs when an unhandled exception occurs in the application. This is a fundamental error event to understand when you develop Windows software.
How is the DelphiVCL.Application.OnException event used?
Use…
What is an OnGetActiveFormHandle Event in DelphiVCL.Application?
December 26, 2021
OnGetActiveFormHandle or DelphiVCL.Application.OnGetActiveFormHandle is the event triggered when reading the value of the ActiveFormHandle property.
Let’s take a look at all of DelphiVCL.Application.OnGetActiveFormHandle properties, methods, and built-in properties:
import DelphiVCL
dir(DelphiVCL.Application.OnGetActiveFormHandle)
See the responses in our Windows…
DelphiVCL.BitBtn is a push button control that can include a bitmap on its face. It’s an alternative to the regular button control which can’t directly use graphics on it.
Bitmap buttons exhibit the same behavior as button controls. We use them to initiate…
The Alignment or TAlignment property is used to specify how text is aligned within a control. The default value of the Alignment property is taLeftJustify.
These are the possible values of Alignment:
Value
Meaning
taLeftJustify
Align text on the…
The Sender property specifies which component notifies the change link object of changes.
We use Sender to access the component that has changed.
Here is a working example of the implementation of Sender property in DelphiVCL:
# Implementation in Color Box Creation
def ColorChangeHandler(Sender):
shpRectangle.Brush.Color = clbSelect.Selected
# Implementation in…
