From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.help Subject: Re: Selection threshold with mouse Date: Mon, 21 Jul 2014 18:31:14 +0300 Message-ID: <83ha2a4tkt.fsf@gnu.org> References: <20140719.173203.1998048028110686770.tak.kunihiro@gmail.com> <20140720.085224.514514587.tak.kunihiro@gmail.com> <83oawk3pzx.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1405956713 18065 80.91.229.3 (21 Jul 2014 15:31:53 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 21 Jul 2014 15:31:53 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Jul 21 17:31:48 2014 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X9FZ3-0002H4-1R for geh-help-gnu-emacs@m.gmane.org; Mon, 21 Jul 2014 17:31:45 +0200 Original-Received: from localhost ([::1]:34717 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X9FZ2-0003xi-Fg for geh-help-gnu-emacs@m.gmane.org; Mon, 21 Jul 2014 11:31:44 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:33046) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X9FYi-0003wI-QH for help-gnu-emacs@gnu.org; Mon, 21 Jul 2014 11:31:31 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X9FYc-0008Vy-A8 for help-gnu-emacs@gnu.org; Mon, 21 Jul 2014 11:31:24 -0400 Original-Received: from mtaout22.012.net.il ([80.179.55.172]:49714) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X9FYc-0008Vl-27 for help-gnu-emacs@gnu.org; Mon, 21 Jul 2014 11:31:18 -0400 Original-Received: from conversion-daemon.a-mtaout22.012.net.il by a-mtaout22.012.net.il (HyperSendmail v2007.08) id <0N9200H00J2LVP00@a-mtaout22.012.net.il> for help-gnu-emacs@gnu.org; Mon, 21 Jul 2014 18:31:16 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout22.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N9200HEEJ43KW60@a-mtaout22.012.net.il> for help-gnu-emacs@gnu.org; Mon, 21 Jul 2014 18:31:16 +0300 (IDT) In-reply-to: X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: Solaris 10 X-Received-From: 80.179.55.172 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:98866 Archived-At: > From: Stefan Monnier > Date: Mon, 21 Jul 2014 10:20:25 -0400 > > > Because the existing methods are glyph-granular, not pixel-granular. > > When you tell them to stop at pixel coordinate X, they move one > > "display element" (e.g., character or image) at a time, > > But they need to keep track either of the "current pixel position" (to > compare against X) or (equivalently) of "remaining pixels until X". > So they should know the exact pixel position. Like I said, you cannot rely on that: else if ((op & MOVE_TO_X) && it->current_x >= to_x) { ^^^^ result = MOVE_X_REACHED; break; } IOW, the exact pixel position is not always what you want in the case in point. All you know it's not _before_ X.