[DUG] Component creation

[Gary T. Benner]

[Reply]

HI JOhn,

You can strat with the Windows SDK Help accessible from the Help Menu.

Search on "WM_" get's you started.

cheers

Gary


At 13:49 on 6/09/2006 you wrote 
>To  : delphi at ns3.123.co.nz
>CC  : >From: John Bird, johnkbird at paradise.net.nz
>Content Type: text/plain
>Attached: >
>This raises a related question.....
>
>Where does one get such information on Windows Messages?  So far seems
>mainly ask someone who knows, or Google.
>Fortunately I 've only done a little message handling so far, I would feel
>in the dark if I had to...
>
>Any good reference material?
>
>John
>
>-----Original Message-----
>From: delphi-bounces at ns3.123.co.nz [mailto:delphi-bounces at ns3.123.co.nz] On
>Behalf Of Robert martin
>Sent: Wednesday, 6 September 2006 1:24 p.m.
>To: karlreynolds at xtra.co.nz; NZ Borland Developers Group - Delphi List
>Subject: Re: [DUG] Component creation
>
>
>Hi
>
>I didn't know about WM_CAPTURECHANGED but it read as similar.  I used >CancelMode simply because that was what was in my example controls.
>
>I just did a quick test and it doesn't seem to trigger on the same >events (It seemed to only trigger when clicking on my control).  Not >really thoroughly tested though.  I will stick wilt CancelMode as I have >it working well :)
>
>
>Rob Martin
>Software Engineer
>
>phone +64 03 377 0495
>fax   +64 03 377 0496
>web www.chreos.com
>
>Wild Software Ltd
>
>
>
>Karl @ Work wrote:
>> You learn something every day.  Guess my hooking code was OTT.
>>
>> I notice that although some effort has obviously been made to >> implement CM_CANCELMODE, its effects look very similar to those of >> WM_CAPTURECHANGED (Rob, mightn't that work for you as well?).  Can >> anyone enlighten me as to the difference?
>>
>> Cheers,
>> Carl
>>
>>   >>> -----Original Message-----
>>> From: delphi-bounces at ns3.123.co.nz >>> [mailto:delphi-bounces at ns3.123.co.nz]On Behalf Of Robert martin
>>> Sent: Tuesday, September 05, 2006 7:42 PM
>>> To: NZ Borland Developers Group - Delphi List
>>> Subject: Re: [DUG] Component creation
>>>
>>>
>>> Hi all
>>>
>>> I have this beaten now  !!!!
>>>
>>> The required message is CM_CANCELMODE ....
>>>
>>> procedure   CMCancelMode(var Message: TCMCancelMode); message
>>> CM_CANCELMODE;
>>>
>>>
>>> I found this using my expert skills (or looking at some third party >>> components we use and putting breakpoints in)  ;-)
>>>
>>> I had tried this earlier but my component actually creates a child >>> component when expanded and I needed to better provide communication >>> between them.  I am not an expert component creator (far from it) but >>> what I have is both components checking for this event and using the >>> ScreenToClient code provided by Todd to ensure the mouse isn't within >>> either component. If not it closes the 'component'.
>>>
>>> CM_CANCELMODE and its friend WM_CANCELMODE are really strangely >>> described my MS and others as 'providing special functionality in >>> certain circumstances' or some such.  But essentially it seems to be >>> when a non focusable control or window is selected.
>>>
>>> Will test further but it seems this has hit the nail on the head.  A >>> big thanks to all who have contributed.
>>>
>>>
>>>
>>> Rob Martin
>>> Software Engineer
>>>
>>> phone +64 03 377 0495
>>> fax   +64 03 377 0496
>>> web www.chreos.com
>>>
>>> Wild Software Ltd
>>>     >>
>> _______________________________________________
>> Delphi mailing list
>> Delphi at ns3.123.co.nz http://ns3.123.co.nz/mailman/listinfo/delphi
>>
>>   >_______________________________________________
>Delphi mailing list
>Delphi at ns3.123.co.nz http://ns3.123.co.nz/mailman/listinfo/delphi
>
>
>__________ NOD32 1.1461 (20060329) Information __________
>
>This message was checked by NOD32 antivirus system. http://www.eset.com
>
>
>_______________________________________________
>Delphi mailing list
>Delphi at ns3.123.co.nz
>http://ns3.123.co.nz/mailman/listinfo/delphi
>

Ref#: 41006

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://ns3.123.co.nz/pipermail/delphi/attachments/20060906/c818c849/attachment-0001.html