Re: [platform-swt-dev] Exposing NCLBUTTON* and NCRBUTTON* via listeners

[Steve Northover <Steve_Northover@xxxxxxxxxx>]

We couldn't expose WM_NCLBUTTONDOWN
as API because it's a Windows only message.  Although SWT does have
the concept of client area, events in non-client area are not modeled.
 The is because, for example, on X windows systems, when the user
clicks in the title bar, the event goes to the window manager, not SWT
so we couldn't offer mouse events in the title bar and be portable.

If you know you are only running on
Windows, you can patch SWT.  There are also low level win32 hooks
that you can use to intercept every Windows message that goes to an application.
 NOTE: If you did this and your code is slow, you will affect the
performance of the entire application.

> that's
windows non-client area, e.g. shell decoration and main menu.

In the case of the main menu, you could
filter on SWT.Show for menus and hide your custom menu when the operating
system shows the native one.  For the title area, you could filter
on shell events SWT.Move, SWT.Resize, SWT.Iconify etc. and hide your menu
when the user performed one of these actions.  I have not tried it
but it should be "ok".

Doing both of these things could get
you closer, but it won't be the same as WM_NCLBUTTONDOWN.

Łukasz Milewski <lukasz.milewski@xxxxxxxxx>
Sent by: platform-swt-dev-bounces@xxxxxxxxxxx

03/13/2009 12:33 PM

Please respond to
"Eclipse Platform SWT component developers list."        <platform-swt-dev@xxxxxxxxxxx>

To	"Eclipse Platform SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>
cc
Subject	[platform-swt-dev] Exposing NCLBUTTON* and NCRBUTTON* via listeners

Hi,

To create custom popup menu, I'm showing shell (containing all widgets
and drawing) without actually focusing on it. I need it this way,
because parent shell has a lot of logic related to losing focus. After
that I want to close that popup shell when click outside of it. I'm
able to accomplish 95% of cases for that using Display filters, but
there's one place I'm not able to intercept events - that's windows
non-client area, e.g. shell decoration and main menu.

I did some digging around this and found that WM_NCLBUTTONDOWN window
proc message is sent when left mouse button click event occurs on
window decoration and main menu.

Would there be a possibility of introducing ability to listen for those
events?

I've also sent this message to the newsgroup, I don't know where does
kind of question should be addressed.

Regards,
Lukasz Milewski
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