RE: [TCLCORE] Re: TIP #145 'Enhanced Tk Font Handling' and Re: TI P #154: Add Named Colors to Tk

[WANGNICK S. <seb...@eu...>]

The possibility to respond to system color changes was also mentioned by Jim Ingham in reply to TIP #154. 

I would appreciate modifiable named colors very much, albeit with a different intention. I'm currently going through quite a nightmare of canvas item tags and variable traces to separate the design of a "brightness control" window (which allows the user to change the brightness of different kind of colors used, e.g., by canvas items presenting an air-traffic situation) from the rest of the application in a performant manner.

Regards,
Sebastian
--
Dipl.-Inform. Sebastian <dot> Wangnick <at eurocontrol dot int>
Office: Eurocontrol Maastricht UAC, Horsterweg 11, NL-6199AC Maastricht-Airport,
        Tel: +31-433661-370, Fax: -300


-----Original Message-----
From: Mic...@fr... [mailto:Mic...@fr...] 
Sent: Tuesday 30 September 2003 14:03
To: tcl...@li...
Subject: [TCLCORE] Re: FINAL CALL FOR COMMENT: TIP #145 'Enhanced Tk Font Handling'


> The toplevel Windows message message handler function WmProc must 
> handle
the 
> WM_SETTINGCHANGE message by calling the TkWinSetupSystemFonts 
> function.
> This must call TkDeleteNamedFont and then TkCreateNamedFont to properly 
> re-define the font and to propagate this change to all Tk widgets 
concerned.

The last time I looked at the implementation I noticed that it deletes & 
re-creates fonts on *each* WM_SETTINGCHANGED message. That message is sent 
for many, many reasons. Clearly fonts should only be modified (and windows 
updated) when necessary.

A good model here will make it possible to also respond to system *color* 
changes down the road.

____

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