From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: line-pixel-height beyond eol Date: Wed, 13 Sep 2017 18:28:12 +0300 Message-ID: <83shfqobxv.fsf@gnu.org> References: <0963B695-945E-4DFD-8703-BCCB4562480F@misasa.okayama-u.ac.jp> <83a820q7a3.fsf@gnu.org> <20170913.092430.784440060052023776.tkk@misasa.okayama-u.ac.jp> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1505316605 6675 195.159.176.226 (13 Sep 2017 15:30:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 13 Sep 2017 15:30:05 +0000 (UTC) Cc: emacs-devel@gnu.org To: Tak Kunihiro Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Sep 13 17:29:58 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ds9by-0001bq-9q for ged-emacs-devel@m.gmane.org; Wed, 13 Sep 2017 17:29:58 +0200 Original-Received: from localhost ([::1]:43066 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ds9c4-0006BP-45 for ged-emacs-devel@m.gmane.org; Wed, 13 Sep 2017 11:30:04 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:32999) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ds9aL-0005PF-CQ for emacs-devel@gnu.org; Wed, 13 Sep 2017 11:28:18 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ds9aG-0001gN-TH for emacs-devel@gnu.org; Wed, 13 Sep 2017 11:28:17 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:47996) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ds9aG-0001gI-Pt; Wed, 13 Sep 2017 11:28:12 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:3606 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1ds9aF-0007PQ-UW; Wed, 13 Sep 2017 11:28:12 -0400 In-reply-to: <20170913.092430.784440060052023776.tkk@misasa.okayama-u.ac.jp> (message from Tak Kunihiro on Wed, 13 Sep 2017 09:24:30 +0900 (JST)) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:218193 Archived-At: > Date: Wed, 13 Sep 2017 09:24:30 +0900 (JST) > Cc: emacs-devel@gnu.org, tkk@misasa.okayama-u.ac.jp > From: Tak Kunihiro > > > I don't think I understand what value you want to obtain. Can you > > elaborate, and perhaps also explain what do you want to do with that > > value and why? > > With Eww, I often meet pages with wide images. I want to scroll > pixel-wisely the buffers with auto-hscroll-mode off even when > (current-column) is a large number. > > The building block of pixel-wise scrolling is described as below. > > (progn (vertical-motion 1) > (dolist (vs (number-sequence 1 (1- (frame-char-height)))) > (set-window-vscroll nil vs t) (sit-for 0.01)) > (scroll-up 1)) > > To determine when to flush in a buffer of lines with different height, > I have to know Just a moment: why would you need to change the above code when lines have variable height? The above code scrolls the buffer one pixel at a time until you scroll the height of frame's canonical character; with tall lines, doing that will scroll less than the full line. But why is that a problem? The user will just have to spin the wheel some more. > - height of line in pixel of the top line on screen. Why the top line on screen? What is special about that line? > I think that, on XXX condition, I rather should obtain it as > frame-char-height instead of line-pixel-height. I cannot find how to > describe the XXX condition. I think you may be trying a specific solution too early. I'm not yet sure I understand why the original code doesn't work for your needs.