From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Owen Taylor Newsgroups: gmane.emacs.devel Subject: Re: Gtk scrollbar: thumb too short Date: 07 Apr 2003 14:57:02 -0400 Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: <1049741822.15342.57.camel@localhost.localdomain> References: <20030325193739.ZGIN3924.fep01-svc.swip.net@gaffa.gaia.swipnet.se> <3E8345E8.4090509@swipnet.se> <1048872463.17161.132.camel@localhost.localdomain> <1049134327.3326.74.camel@localhost.localdomain> <84of3p2m44.fsf@lucy.is.informatik.uni-duisburg.de> <200304021352.h32DqLO11793@eel.dms.auburn.edu> <1049729721.4045.47.camel@localhost.localdomain> <200304071657.h37Gv2LG024488@rum.cs.yale.edu> <1049740246.15331.51.camel@localhost.localdomain> <200304071838.h37IcO6F025197@rum.cs.yale.edu> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Trace: main.gmane.org 1049743486 30780 80.91.224.249 (7 Apr 2003 19:24:46 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Mon, 7 Apr 2003 19:24:46 +0000 (UTC) Cc: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Mon Apr 07 21:24:39 2003 Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by main.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 192cDD-0007sM-00 for ; Mon, 07 Apr 2003 21:23:23 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.12 #1 (Debian)) id 192cGr-0003pl-00 for ; Mon, 07 Apr 2003 21:27:09 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.10.13) id 192cCG-0004ak-02 for emacs-devel@quimby.gnus.org; Mon, 07 Apr 2003 15:22:24 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.10.13) id 192cBJ-0004MR-00 for emacs-devel@gnu.org; Mon, 07 Apr 2003 15:21:25 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.10.13) id 192bz1-0000Az-00 for emacs-devel@gnu.org; Mon, 07 Apr 2003 15:08:46 -0400 Original-Received: from nat-pool-rdu.redhat.com ([66.187.233.200] helo=lacrosse.corp.redhat.com) by monty-python.gnu.org with esmtp (Exim 4.10.13) id 192bpP-0005CR-00; Mon, 07 Apr 2003 14:58:47 -0400 Original-Received: from landau.devel.redhat.com (landau.devel.redhat.com [172.16.56.103])h37Iwju01137; Mon, 7 Apr 2003 14:58:45 -0400 Original-To: Stefan Monnier In-Reply-To: <200304071838.h37IcO6F025197@rum.cs.yale.edu> X-Mailer: Ximian Evolution 1.2.2 (1.2.2-0) Original-cc: rms@gnu.org Original-cc: Luc Teirlinck Original-cc: kai.grossjohann@gmx.net X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1b5 Precedence: list List-Id: Emacs development discussions. List-Help: List-Post: List-Subscribe: , List-Archive: List-Unsubscribe: , Errors-To: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Xref: main.gmane.org gmane.emacs.devel:12986 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:12986 On Mon, 2003-04-07 at 14:38, Stefan Monnier wrote: > > > IIUC, the scrollbar widget has the following: > > > > > > total-size > > > minimum thumb size > > > thumb size > > > thumb position > > > > > > Where minimum-thumb-size is (for all intents and purposes here) a constant. > > > Let's simplify things and subtract minimum thumb size from the current > > > thumb size and from the total, we get: > > > > > > total-size > > > thumb size > > > thumb position > > > > > > where > > > > > > 0 <= thumb-size <= total-size > > > thumb-size + thumb-position <= total-size > > > > This isn't a "simplification", it is a different algorithm > > from what GTK+ uses. The scrollbar thumb size in GTK+ > > is: > > > > MAX (min_size, total_size * document_page_size/document_size) > > [ I assume that total_size = document_size to simplify the discussion ] > So if min_size is 10, total_size is 100 and page_size is 1, how does > the user get to see the last page ? The 0-99 possible values for position in the document are mapped linearly onto the 0-90 possible values for the position of the slider thumb. Regards, Owen