Article View: comp.windows.interviews
Article #1168Re: GetCanvas returns NULL
From: Mark Linton
Date: Tue, 14 May 1991 22:06
Date: Tue, 14 May 1991 22:06
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In article <1991May14.052613.29659@bellcore.bellcore.com>, doron@mobydick.leis.bellcore.com (Doron Shalmon) writes: |> Is there some point in the life of an interactor when it is guaranteed |> to be mapped? What I'm looking for is some member function in which |> I can be guaranteed that the canvas is not nil (much the same way as |> you *know* that the interactor knows about its parents and the world |> in Reconfig). |> |> Specifically, I have a damage object that needs to know the canvas |> of a graphic block, and I'd like to have the graphic block take care |> of this when it gets mapped (rather than do some explicit Set call |> after I insert the graphic block into the world). Resize is called when an interactor has a canvas. However, there is no corresponding call when a canvas is unmapped or removed. Your damage object is therefore better off with a pointer to the graphic block and calling GetCanvas on it.
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<1991May14.220623.19750@fido.wpd.sgi.com>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!wuarchive!zaphod.mps.ohio-state.edu!mips!sgi!shinobu!fido.wpd.sgi.com!marktwain.rad.sgi.com!lintonReferences:
<9105120300.AA29103@shiva.trl.OZ.AU> <1991May13.161932.28060@fido.wpd.sgi.com> <1991May14.052613.29659@bellcore.bellcore.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!wuarchive!zaphod.mps.ohio-state.edu!mips!sgi!shinobu!fido.wpd.sgi.com!marktwain.rad.sgi.com!linton From: linton@marktwain.rad.sgi.com (Mark Linton) Newsgroups: comp.windows.interviews Subject: Re: GetCanvas returns NULL Message-ID: <1991May14.220623.19750@fido.wpd.sgi.com> Date: 14 May 91 22:06:23 GMT References: <9105120300.AA29103@shiva.trl.OZ.AU> <1991May13.161932.28060@fido.wpd.sgi.com> <1991May14.052613.29659@bellcore.bellcore.com> Sender: news@fido.wpd.sgi.com (Usenet News Admin) Reply-To: linton@marktwain.rad.sgi.com (Mark Linton) Organization: sgi Lines: 16