How to Manage the Mouse Wheel on a TImage ?

Thread View: borland.public.cppbuilder.nativeapi

5 messages

[T] Back to Threads [V] Tree View [G] Group Articles

5 total messages Started by Wookie Wed, 15 Aug 2007 08:53

#1399

Author: Wookie
Date: Wed, 15 Aug 2007 08:53

9 lines
1143 bytes

Hi All,

I would like to handle the mouse wheel on a TImage. The default Events
of the TImage component does not allow to do it. I tried to use the
WndProc to get the event but unsuccessfully. How can I do ?

Many thanks in advance

Christophe

Re: How to Manage the Mouse Wheel on a TImage ?

#1401

Author: Remy Lebeau (TeamB)
Date: Wed, 15 Aug 2007 16:50

14 lines
1334 bytes

"Wookie" <fa067235@skynet.be> wrote in message
news:46C2BEFF.AEE49233@skynet.be...

> I would like to handle the mouse wheel on a TImage.

You won't be able to, as TImage is not a windowed control, so it can't
receive wheel messages from the OS.

What you can do, however, is put the TImage onto a windowed control, such as
a TScrollBox, and let it handle the scrolling for you.


Gambit

Re: How to Manage the Mouse Wheel on a TImage ?

#1404

Author: Wookie
Date: Thu, 16 Aug 2007 18:11

19 lines
1622 bytes

Thanks for the input. It works fine. One more question : What is the Windows
Message sent when the OnMouseWheel Event occurs ?

Christophe

"Remy Lebeau (TeamB)" wrote:

> "Wookie" <fa067235@skynet.be> wrote in message
> news:46C2BEFF.AEE49233@skynet.be...
>
> > I would like to handle the mouse wheel on a TImage.
>
> You won't be able to, as TImage is not a windowed control, so it can't
> receive wheel messages from the OS.
>
> What you can do, however, is put the TImage onto a windowed control, such as
> a TScrollBox, and let it handle the scrolling for you.
>
> Gambit

Re: How to Manage the Mouse Wheel on a TImage ?

#1405

Author: Remy Lebeau (TeamB)
Date: Thu, 16 Aug 2007 19:17

16 lines
1552 bytes

"Wookie" <fa067235@skynet.be> wrote in message
news:46C4935B.BE142AC6@skynet.be...

> What is the Windows Message sent when the OnMouseWheel Event occurs ?

That depends on the OS version.  If the OS natively supports a mouse wheel,
then a WM_MOUSEWHEEL message is issued.  On OS versions that don't natively
support a mouse wheel, there is an add-on executable named MSWHEEL.EXE that
can be installed which runs in the background and issues a message that is
obtained via RegisterWindowMessage() instead.  You can use the global
TMouse::RegWheelMessage property to know what specific message ID is being
used in that situation.


Gambit

Re: How to Manage the Mouse Wheel on a TImage ?

#1407

Author: Christophe MINETTI
Date: Fri, 17 Aug 2007 05:52

20 lines
1839 bytes

Once again, you have the answer to any question ! Many thank Gambit !

Christophe

"Remy Lebeau (TeamB)" wrote:

> "Wookie" <fa067235@skynet.be> wrote in message
> news:46C4935B.BE142AC6@skynet.be...
>
> > What is the Windows Message sent when the OnMouseWheel Event occurs ?
>
> That depends on the OS version.  If the OS natively supports a mouse wheel,
> then a WM_MOUSEWHEEL message is issued.  On OS versions that don't natively
> support a mouse wheel, there is an add-on executable named MSWHEEL.EXE that
> can be installed which runs in the background and issues a message that is
> obtained via RegisterWindowMessage() instead.  You can use the global
> TMouse::RegWheelMessage property to know what specific message ID is being
> used in that situation.
>
> Gambit

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads