[DUG] Component creation

[Robert martin]

I just used Google but event the MS web site which has information on 
these provides very minimal descriptions of what the messages are.

Rob Martin
Software Engineer

phone +64 03 377 0495
fax   +64 03 377 0496
web www.chreos.com

Wild Software Ltd



John Bird wrote:
> 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
>>>     
>>>       
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>>   
>>     
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