From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Po Lu Newsgroups: gmane.emacs.help Subject: Re: Correct way to implement `pixel-point-and-height-at-unseen-line'? Date: Tue, 14 Dec 2021 08:41:06 +0800 Message-ID: <87czm0uifx.fsf@yahoo.com> References: <87pmq1wag9.fsf.ref@yahoo.com> <87pmq1wag9.fsf@yahoo.com> <838rwomv73.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="17209"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (gnu/linux) Cc: help-gnu-emacs@gnu.org To: Eli Zaretskii Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Dec 14 01:50:38 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mww1e-0004J7-6u for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 14 Dec 2021 01:50:38 +0100 Original-Received: from localhost ([::1]:39198 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mww1c-0002Ux-95 for geh-help-gnu-emacs@m.gmane-mx.org; 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Tue, 14 Dec 2021 00:41:15 +0000 Original-Received: by kubenode502.mail-prod1.omega.sg3.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID b936c1543711003c05d6e4f4921f9d0d; Tue, 14 Dec 2021 00:41:11 +0000 (UTC) In-Reply-To: <838rwomv73.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 13 Dec 2021 16:32:48 +0200") X-Mailer: WebService/1.1.19415 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Received-SPF: pass client-ip=66.163.189.147; envelope-from=luangruo@yahoo.com; helo=sonic314-21.consmr.mail.ne1.yahoo.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:134964 Archived-At: Eli Zaretskii writes: > And you didn't describe why do you need > pixel-point-and-height-at-unseen-line's data in the first place, so > maybe there's a different solution to whatever you are trying to do > that doesn't involve such a function. It's used to find a suitable new start position that's N pixels above window start, so vscroll can then be set to compensate for the difference. For instance, scrolling up by a delta of 1 pixel if vscroll is already zero will move to such a start position, and set vscroll to the returned height - 1. Thanks.