mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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Added FAQ to the tree in prep for others to start working on it...
This commit is contained in:
Shawn Amundson
parent
0b372cfb3a
commit
b2140a2322
@ -2,7 +2,7 @@
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info_TEXINFOS = gdk.texi gtk.texi
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EXTRA_DIST = texinfo.tex macros.texi
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EXTRA_DIST = texinfo.tex macros.texi Makefile.gtkfaq gtkfaq.sgml gtkfaq_fix
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files:
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@files=`ls $(DISTFILES) 2> /dev/null `; for p in $$files; do \
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16
docs/Makefile.gtkfaq
Normal file
16
docs/Makefile.gtkfaq
Normal file
@ -0,0 +1,16 @@
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#
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# To use this makefile, do:
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# make -f Makefile.gtkfaq
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#
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# This is not done by default because you might
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# not have sgml2html installed... Perhaps we could
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# detect that in the future and combine it in with
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# the automake stuff...
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#
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all: sgml
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sgml:
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sgml2html gtkfaq.sgml
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cp gtkfaq.html index.html
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perl gtkfaq_fix *.html
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456
docs/faq/gtkfaq.sgml
Normal file
456
docs/faq/gtkfaq.sgml
Normal file
@ -0,0 +1,456 @@
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<!doctype linuxdoc system>
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<article>
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<!-- Title information -->
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<title>GTK+ FAQ
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<author>Shawn T. Amundson, <tt/amundson@cs.umn.edu/
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<date>July 31, 1997
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<abstract>
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This document is intended to answer questions that are likely to be
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frequently asked by programmers using GTK+ or people who are just
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looking at using GTK+.
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</abstract>
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<!-- Table of contents -->
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<toc>
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<!-- Begin the document -->
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<!-- ***************************************************************** -->
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<sect>General Information
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<!-- ----------------------------------------------------------------- -->
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<sect1>Authors and Copyright
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<p>
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The authors of GTK+ are:
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<verb>
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Peter Mattis (petm@xcf.berkeley.edu)
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Spencer Kimball (spencer@xcf.berkeley.edu)
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Josh MacDonald (jmacd@xcf.berkeley.edu)
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</verb>
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The copyright notice on the library files is the following:
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<tscreen><verb>
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/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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</verb></tscreen>
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<!-- ----------------------------------------------------------------- -->
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<sect1>What is GTK?
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<p>
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GTK is a small and efficient widget set designed with the general look
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and feel of Motif. In reality, it looks much better than Motif. It
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contains common widgets and some more complex widgets such as a file
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selection, and color selection widgets.
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<!-- ----------------------------------------------------------------- -->
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<sect1>What is the + in GTK+?
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<P>
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Peter Mattis informed the gtk mailing list that:
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<quote>
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"I originally wrote gtk which included the three libraries, libglib,
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libgdk and libgtk. It featured a flat widget hierarchy. That is, you
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couldn't derive a new widget from an existing one. And it contained
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a more standard callback mechanism instead of the signal mechanism now
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present in gtk+. The + was added to distinguish between the original
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version of gtk and the new version. You can think of it as being an
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enhancement to the original gtk that adds object oriented features."
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</quote>
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<!-- ----------------------------------------------------------------- -->
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<sect1>What is the policy on incorporating new widgets into the gtk library?
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<p>
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This is up to the authors, so you will have to ask them once you
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are done with your widget. As a general guideline, widgets that are
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generally useful, work, and are not a disgrace to the widget set will
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gladly be included.
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<!-- ----------------------------------------------------------------- -->
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<sect1>Does the G in GTK stand for General, Gimp, or GNU?
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<p>
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Peter Mattis informed the gtk mailing list that:
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<quote>
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"I think the last time Spencer and I talked about it we decided on
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GTK = Gimp ToolKit. But I don't know for sure. Its definately not
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GNU, though."
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</quote>
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||||
<!-- ----------------------------------------------------------------- -->
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<sect1>Why use g_print, g_malloc, g_strdup and fellow glib functions ?
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<P>
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Thanks to Tim Janik who wrote to gtk-list: (slightly modified)
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<quote>
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Regarding g_malloc(), g_free() and siblings, these functions are much safer
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than thier libc equivalences. For example, g_free() just returns if called
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with NULL. Also, if USE_DMALLOC is defined, the definition for these
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functions changes (in glib.h) to use MALLOC(), FREE() etc... If MEM_PROFILE
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or MEM_CHECK are defined, there are even small statistics made counting
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the used block sizes (shown by g_mem_profile() / g_mem_check()).
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<p>
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Considering the fact that glib provides an interface for memory chunks
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to save space if you have lots of blocks that are always the same size
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and to mark them ALLOC_ONLY if needed, it is just straight forward to
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create a small saver (debug able) wrapper around the normal malloc/free
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stuff as well - just like gdk covers Xlib. ;)
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<p>
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Using g_error() and g_warning() inside of applications like the GIMP
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that fully rely on gtk even gives the opportunity to pop up a window
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showing the messages inside of a gtk window with your own handler
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(by using g_set_error_handler()) along the lines of gtk_print()
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(inside of gtkmain.c).
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</quote>
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<!-- ----------------------------------------------------------------- -->
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<sect1>What applications have been written with GTK+?
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<p>
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Some applications which use GTK+ are:
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<itemize>
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<item>GIMP (<url url="http://www.XCF.Berkeley.EDU/~gimp/"> ),
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an image manipulation program
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<item>Gsumi (<url url="http://student-www.uchicago.edu/users/otaylor/gsumi/gsumi.html">),
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a port of xink
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<item>GUBI (<url url="http://www.SoftHome.net/pub/users/timj/gubi/index.htm"> ),
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a user interface builder
|
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<item>Gzilla (<url url="http://www.levien.com/gzilla/"> ),
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a web browser
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<item>SANE (<url url="http://www.azstarnet.com/~axplinux/sane/"> ),
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a universal scanner interface
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</itemize>
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|
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<!-- ----------------------------------------------------------------- -->
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<sect1>Is anyone working on C++ bindings?
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<P>
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Yes! Elliot Lee has started gtk--, and has released a couple versions
|
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already. So far so good! You can find these bindings at
|
||||
<url url="ftp://ftp.redhat.com/sopwith">.
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|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Is anyone working on Guile bindings?
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<p>
|
||||
Yes, Peter Mattis. Here is what he said:
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|
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<quote>
|
||||
"Btw, guile-1.1 is on prep.ai.mit.edu if anyone didn't know. Guile is
|
||||
an R4RS scheme interpreter and extension library. I've
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already done scheme bindings for gtk using SIOD, but SIOD isn't R4RS
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(the scheme standard) compatible. And the new bindings will be much
|
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much better."
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</quote>
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|
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|
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<!-- ----------------------------------------------------------------- -->
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<sect1>The gtk-list hasn't had any traffic for days, is it dead?
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<p>
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No, everyone's just busy coding.
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<!-- ----------------------------------------------------------------- -->
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<sect1>Where is the documentation for GTK+?
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<p>
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Look in the GTK distribution's doc/ directory. In addition, if you
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are on the web, you cat get it by going to
|
||||
<url url="http://www.cs.umn.edu/~amundson/gtk/docs/">, where they
|
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are already converted to HTML format.
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||||
|
||||
You can download the HTML to your home machine with your browser. There
|
||||
are only four files in these docs:
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<verb>
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http://www.cs.umn.edu/~amundson/gtk/docs/gtk_toc.html
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http://www.cs.umn.edu/~amundson/gtk/docs/gtk.html
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http://www.cs.umn.edu/~amundson/gtk/docs/gdk_toc.html
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http://www.cs.umn.edu/~amundson/gtk/docs/gdk.html
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||||
</verb>
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||||
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This is the only place to get them in html that I know of. I do not have
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time to gzip them, but they are not so huge anyway. (I'm lazy too!)
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<!-- ***************************************************************** -->
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<sect>Widgets
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<!-- ----------------------------------------------------------------- -->
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<sect1>How can I prevent redrawing and resizing while I change multiple widgets?
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<p>
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||||
Use gtk_container_disable_resize and gtk_container_enable_resize around the
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code where you are changing a lot of stuff. This will result in much faster
|
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speed since it will prevent resizing of the entire widget hierarchy.
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||||
|
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<!-- ----------------------------------------------------------------- -->
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||||
<sect1>How do I find out about the selection of a GtkList?
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<p>
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||||
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Get the selection something like this:
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||||
<tscreen><verb>
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||||
GList *sel;
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||||
sel = GTK_LIST(list)->selection;
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</verb></tscreen>
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This is how GList is defined (quoting glist.h):
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<tscreen><verb>
|
||||
typedef struct _GList GList;
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||||
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||||
struct _GList
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||||
{
|
||||
gpointer data;
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||||
GList *next;
|
||||
GList *prev;
|
||||
};
|
||||
</verb></tscreen>
|
||||
|
||||
A GList structure is just a simple structure for doubly linked lists.
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||||
there exist several g_list_*() functions to modify a linked list in
|
||||
glib.h. However the GTK_LIST(MyGtkList)->selection is maintained
|
||||
by the gtk_list_*() functions and should not be modified.
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||||
|
||||
The selection_mode of the GtkList determines the selection
|
||||
facilities of a GtkList and therefore the contents
|
||||
of GTK_LIST(AnyGtkList)->selection:
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||||
|
||||
<verb>
|
||||
selection_mode GTK_LIST()->selection contents
|
||||
------------------------------------------------------
|
||||
|
||||
GTK_SELECTION_SINGLE) selection is either NULL
|
||||
or contains a GList* pointer
|
||||
for a single selected item.
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||||
|
||||
GTK_SELECTION_BROWSE) selection is NULL if the list
|
||||
contains no widgets, otherwise
|
||||
it contains a GList* pointer
|
||||
for one GList structure.
|
||||
GTK_SELECTION_MULTIPLE) selection is NULL if no listitems
|
||||
are selected or a a GList* pointer
|
||||
for the first selected item. that
|
||||
in turn points to a GList structure
|
||||
for the second selected item and so
|
||||
on
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||||
|
||||
GTK_SELECTION_EXTENDED) selection is NULL.
|
||||
</verb>
|
||||
|
||||
The data field of the GList structure GTK_LIST(MyGtkList)->selection points
|
||||
to the first GtkListItem that is selected. So if you would like to determine
|
||||
which listitems are selected you should go like this:
|
||||
|
||||
Upon Initialization:
|
||||
<tscreen><verb>
|
||||
{
|
||||
gchar *list_items[]={
|
||||
"Item0",
|
||||
"Item1",
|
||||
"foo",
|
||||
"last Item",
|
||||
};
|
||||
guint nlist_items=sizeof(list_items)/sizeof(list_items[0]);
|
||||
GtkWidget *list_item;
|
||||
guint i;
|
||||
|
||||
list=gtk_list_new();
|
||||
gtk_list_set_selection_mode(GTK_LIST(list), GTK_SELECTION_MULTIPLE);
|
||||
gtk_container_add(GTK_CONTAINER(AnyGtkContainer), list);
|
||||
gtk_widget_show (list);
|
||||
|
||||
for (i = 0; i < nlist_items; i++)
|
||||
{
|
||||
list_item=gtk_list_item_new_with_label(list_items[i]);
|
||||
gtk_object_set_user_data(GTK_OBJECT(list_item), (gpointer)i);
|
||||
gtk_container_add(GTK_CONTAINER(list), list_item);
|
||||
gtk_widget_show(list_item);
|
||||
}
|
||||
}
|
||||
</verb></tscreen>
|
||||
|
||||
To get known about the selection:
|
||||
<tscreen><verb>
|
||||
{
|
||||
GList *items;
|
||||
|
||||
items=GTK_LIST(list)->selection;
|
||||
|
||||
printf("Selected Items: ");
|
||||
while (items) {
|
||||
if (GTK_IS_LIST_ITEM(items->data))
|
||||
printf("%d ", (guint)
|
||||
gtk_object_get_user_data(items->data));
|
||||
items=items->next;
|
||||
}
|
||||
printf("\n");
|
||||
}
|
||||
</verb></tscreen>
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Is it possible to get some text displayed which is truncated to fit inside its allocation?
|
||||
<p>
|
||||
GTK's behavior (no clipping) is a consequence of its attempts to
|
||||
conserve X resources. Label widgets (among others) don't get their own
|
||||
X window - they just draw their contents on their parent's window.
|
||||
While it might be possible to have clipping occur by setting the clip
|
||||
mask before drawing the text, this would probably cause a substantial
|
||||
performance penalty.
|
||||
|
||||
Its possible that, in the long term, the best solution to such
|
||||
problems might be just to change gtk to give labels X windows.
|
||||
A short term workaround is to put the label widget inside another
|
||||
widget that does get it's own window - one possible candidate would
|
||||
be the viewport widget.
|
||||
|
||||
<tscreen><verb>
|
||||
viewport = gtk_viewport (NULL, NULL);
|
||||
gtk_widget_set_usize (viewport, 50, 25);
|
||||
gtk_viewport_set_shadow_type (GTK_VIEWPORT(viewport), GTK_SHADOW_NONE);
|
||||
gtk_widget_show(viewport);
|
||||
|
||||
label = gtk_label ("a really long label that won't fit");
|
||||
gtk_container_add (GTK_CONTAINER(viewport), label);
|
||||
gtk_widget_show (label);
|
||||
</verb></tscreen>
|
||||
|
||||
If you were doing this for a bunch of widgets, you might want to
|
||||
copy gtkviewport.c and strip out the adjustment and shadow
|
||||
functionality (perhaps you could call it GtkClipper).
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>How do I make menus?
|
||||
<p>
|
||||
Sascha Ziemann wrote to the gtk-list: (slightly modified)
|
||||
<quote>
|
||||
First you have to write a function for every menu: (the translate
|
||||
function returns simple strings)
|
||||
</quote>
|
||||
<tscreen><verb>
|
||||
/***********************************************************************
|
||||
** Create the File-Menu
|
||||
*/
|
||||
GtkWidget* create_file_menu (GtkWidget *window)
|
||||
{
|
||||
GtkWidget *menu;
|
||||
GtkWidget *submenu;
|
||||
GtkWidget *menuitem;
|
||||
GSList *group;
|
||||
|
||||
menu = gtk_menu_new ();
|
||||
submenu = NULL;
|
||||
group = NULL;
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-new-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-open-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
gtk_menu_line_new(GTK_MENU(menu));
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-save-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-saveas-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-saveall-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
gtk_menu_line_new(GTK_MENU(menu));
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-export-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
return menu;
|
||||
}
|
||||
</verb></tscreen>
|
||||
<quote>
|
||||
And in your main window creation function you create a menubar in a box.
|
||||
</quote>
|
||||
<tscreen><verb>
|
||||
/*
|
||||
** base frame
|
||||
*/
|
||||
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
||||
gtk_signal_connect (GTK_OBJECT (window), "destroy",
|
||||
(GtkSignalFunc) destroy_program,
|
||||
&
|
||||
window);
|
||||
gtk_widget_set_name (window, "EDINI");
|
||||
gtk_widget_set_uposition (window, 20, 20);
|
||||
base_frame_box = gtk_vbox_new (FALSE, 10);
|
||||
gtk_container_add (GTK_CONTAINER (window), base_frame_box);
|
||||
gtk_widget_show (base_frame_box);
|
||||
|
||||
/*
|
||||
** the menu bar
|
||||
*/
|
||||
menubar = gtk_menu_bar_new ();
|
||||
gtk_box_pack_start (GTK_BOX (base_frame_box), menubar, FALSE, TRUE, 0);
|
||||
gtk_widget_show (menubar);
|
||||
|
||||
menu = create_file_menu(window);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-menu-label"));
|
||||
gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), menu);
|
||||
gtk_menu_bar_append (GTK_MENU_BAR (menubar), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
</verb></tscreen>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Is there a better way to do the menus?
|
||||
<p>
|
||||
Jay Painter wrote to the gtk-list: (slightly modified)
|
||||
<quote>
|
||||
The best way to make menus is with gtk_menu_factory where you create a
|
||||
structure with all your menus in it, feed it to a function, and all your
|
||||
menus get created for you without 50 calls to gtk_menuitem_new. You can
|
||||
find a good example in the GZilla code. I still don't know exaclty what
|
||||
all the fields are in the structure, but NULL is always a good choice for
|
||||
those. :)
|
||||
</quote>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>How can I define a separation line in a menu?
|
||||
<p>
|
||||
Just insert an empty menu item:
|
||||
|
||||
<tscreen><verb>
|
||||
menuitem = gtk_menu_item_new();
|
||||
gtk_menu_append(GTK_MENU(menu), menuitem);
|
||||
gtk_widget_show(menuitem);
|
||||
</verb></tscreen>
|
||||
|
||||
|
||||
<!-- ***************************************************************** -->
|
||||
<sect>Contributions and Maintainer
|
||||
<p>
|
||||
If you would like to make a contribution to the FAQ, send me an e-mail
|
||||
message with the exact text you think should be included (question and
|
||||
answer). With your help, this document can grow and become more useful!
|
||||
|
||||
This document is maintained by Shawn T. Amundson <
|
||||
amundson@cs.umn.edu>
|
||||
.
|
||||
|
||||
There is no guarentee that this document lives up to its intended
|
||||
purpose. This is simply provided as a free resource. As such,
|
||||
the authors and maintainer of the information provided within can
|
||||
not make any guarentee that the information is even accurate.
|
||||
|
||||
</article>
|
||||
456
docs/gtkfaq.sgml
Normal file
456
docs/gtkfaq.sgml
Normal file
@ -0,0 +1,456 @@
|
||||
<!doctype linuxdoc system>
|
||||
|
||||
<article>
|
||||
|
||||
<!-- Title information -->
|
||||
|
||||
<title>GTK+ FAQ
|
||||
<author>Shawn T. Amundson, <tt/amundson@cs.umn.edu/
|
||||
<date>July 31, 1997
|
||||
<abstract>
|
||||
This document is intended to answer questions that are likely to be
|
||||
frequently asked by programmers using GTK+ or people who are just
|
||||
looking at using GTK+.
|
||||
</abstract>
|
||||
|
||||
<!-- Table of contents -->
|
||||
<toc>
|
||||
|
||||
<!-- Begin the document -->
|
||||
|
||||
<!-- ***************************************************************** -->
|
||||
<sect>General Information
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Authors and Copyright
|
||||
<p>
|
||||
The authors of GTK+ are:
|
||||
|
||||
<verb>
|
||||
Peter Mattis (petm@xcf.berkeley.edu)
|
||||
Spencer Kimball (spencer@xcf.berkeley.edu)
|
||||
Josh MacDonald (jmacd@xcf.berkeley.edu)
|
||||
</verb>
|
||||
|
||||
The copyright notice on the library files is the following:
|
||||
|
||||
<tscreen><verb>
|
||||
/* GTK - The GIMP Toolkit
|
||||
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Library General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Library General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Library General Public
|
||||
* License along with this library; if not, write to the Free
|
||||
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
</verb></tscreen>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>What is GTK?
|
||||
<p>
|
||||
GTK is a small and efficient widget set designed with the general look
|
||||
and feel of Motif. In reality, it looks much better than Motif. It
|
||||
contains common widgets and some more complex widgets such as a file
|
||||
selection, and color selection widgets.
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>What is the + in GTK+?
|
||||
<P>
|
||||
Peter Mattis informed the gtk mailing list that:
|
||||
<quote>
|
||||
"I originally wrote gtk which included the three libraries, libglib,
|
||||
libgdk and libgtk. It featured a flat widget hierarchy. That is, you
|
||||
couldn't derive a new widget from an existing one. And it contained
|
||||
a more standard callback mechanism instead of the signal mechanism now
|
||||
present in gtk+. The + was added to distinguish between the original
|
||||
version of gtk and the new version. You can think of it as being an
|
||||
enhancement to the original gtk that adds object oriented features."
|
||||
</quote>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>What is the policy on incorporating new widgets into the gtk library?
|
||||
<p>
|
||||
This is up to the authors, so you will have to ask them once you
|
||||
are done with your widget. As a general guideline, widgets that are
|
||||
generally useful, work, and are not a disgrace to the widget set will
|
||||
gladly be included.
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Does the G in GTK stand for General, Gimp, or GNU?
|
||||
<p>
|
||||
Peter Mattis informed the gtk mailing list that:
|
||||
<quote>
|
||||
"I think the last time Spencer and I talked about it we decided on
|
||||
GTK = Gimp ToolKit. But I don't know for sure. Its definately not
|
||||
GNU, though."
|
||||
</quote>
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Why use g_print, g_malloc, g_strdup and fellow glib functions ?
|
||||
<P>
|
||||
Thanks to Tim Janik who wrote to gtk-list: (slightly modified)
|
||||
<quote>
|
||||
Regarding g_malloc(), g_free() and siblings, these functions are much safer
|
||||
than thier libc equivalences. For example, g_free() just returns if called
|
||||
with NULL. Also, if USE_DMALLOC is defined, the definition for these
|
||||
functions changes (in glib.h) to use MALLOC(), FREE() etc... If MEM_PROFILE
|
||||
or MEM_CHECK are defined, there are even small statistics made counting
|
||||
the used block sizes (shown by g_mem_profile() / g_mem_check()).
|
||||
<p>
|
||||
Considering the fact that glib provides an interface for memory chunks
|
||||
to save space if you have lots of blocks that are always the same size
|
||||
and to mark them ALLOC_ONLY if needed, it is just straight forward to
|
||||
create a small saver (debug able) wrapper around the normal malloc/free
|
||||
stuff as well - just like gdk covers Xlib. ;)
|
||||
<p>
|
||||
Using g_error() and g_warning() inside of applications like the GIMP
|
||||
that fully rely on gtk even gives the opportunity to pop up a window
|
||||
showing the messages inside of a gtk window with your own handler
|
||||
(by using g_set_error_handler()) along the lines of gtk_print()
|
||||
(inside of gtkmain.c).
|
||||
</quote>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>What applications have been written with GTK+?
|
||||
<p>
|
||||
Some applications which use GTK+ are:
|
||||
<itemize>
|
||||
<item>GIMP (<url url="http://www.XCF.Berkeley.EDU/~gimp/"> ),
|
||||
an image manipulation program
|
||||
<item>Gsumi (<url url="http://student-www.uchicago.edu/users/otaylor/gsumi/gsumi.html">),
|
||||
a port of xink
|
||||
<item>GUBI (<url url="http://www.SoftHome.net/pub/users/timj/gubi/index.htm"> ),
|
||||
a user interface builder
|
||||
<item>Gzilla (<url url="http://www.levien.com/gzilla/"> ),
|
||||
a web browser
|
||||
<item>SANE (<url url="http://www.azstarnet.com/~axplinux/sane/"> ),
|
||||
a universal scanner interface
|
||||
</itemize>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Is anyone working on C++ bindings?
|
||||
<P>
|
||||
Yes! Elliot Lee has started gtk--, and has released a couple versions
|
||||
already. So far so good! You can find these bindings at
|
||||
<url url="ftp://ftp.redhat.com/sopwith">.
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Is anyone working on Guile bindings?
|
||||
<p>
|
||||
Yes, Peter Mattis. Here is what he said:
|
||||
|
||||
<quote>
|
||||
"Btw, guile-1.1 is on prep.ai.mit.edu if anyone didn't know. Guile is
|
||||
an R4RS scheme interpreter and extension library. I've
|
||||
already done scheme bindings for gtk using SIOD, but SIOD isn't R4RS
|
||||
(the scheme standard) compatible. And the new bindings will be much
|
||||
much better."
|
||||
</quote>
|
||||
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>The gtk-list hasn't had any traffic for days, is it dead?
|
||||
<p>
|
||||
No, everyone's just busy coding.
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Where is the documentation for GTK+?
|
||||
<p>
|
||||
Look in the GTK distribution's doc/ directory. In addition, if you
|
||||
are on the web, you cat get it by going to
|
||||
<url url="http://www.cs.umn.edu/~amundson/gtk/docs/">, where they
|
||||
are already converted to HTML format.
|
||||
|
||||
You can download the HTML to your home machine with your browser. There
|
||||
are only four files in these docs:
|
||||
<verb>
|
||||
http://www.cs.umn.edu/~amundson/gtk/docs/gtk_toc.html
|
||||
http://www.cs.umn.edu/~amundson/gtk/docs/gtk.html
|
||||
http://www.cs.umn.edu/~amundson/gtk/docs/gdk_toc.html
|
||||
http://www.cs.umn.edu/~amundson/gtk/docs/gdk.html
|
||||
</verb>
|
||||
|
||||
This is the only place to get them in html that I know of. I do not have
|
||||
time to gzip them, but they are not so huge anyway. (I'm lazy too!)
|
||||
|
||||
<!-- ***************************************************************** -->
|
||||
<sect>Widgets
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>How can I prevent redrawing and resizing while I change multiple widgets?
|
||||
<p>
|
||||
Use gtk_container_disable_resize and gtk_container_enable_resize around the
|
||||
code where you are changing a lot of stuff. This will result in much faster
|
||||
speed since it will prevent resizing of the entire widget hierarchy.
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>How do I find out about the selection of a GtkList?
|
||||
<p>
|
||||
|
||||
Get the selection something like this:
|
||||
<tscreen><verb>
|
||||
GList *sel;
|
||||
sel = GTK_LIST(list)->selection;
|
||||
</verb></tscreen>
|
||||
|
||||
This is how GList is defined (quoting glist.h):
|
||||
<tscreen><verb>
|
||||
typedef struct _GList GList;
|
||||
|
||||
struct _GList
|
||||
{
|
||||
gpointer data;
|
||||
GList *next;
|
||||
GList *prev;
|
||||
};
|
||||
</verb></tscreen>
|
||||
|
||||
A GList structure is just a simple structure for doubly linked lists.
|
||||
there exist several g_list_*() functions to modify a linked list in
|
||||
glib.h. However the GTK_LIST(MyGtkList)->selection is maintained
|
||||
by the gtk_list_*() functions and should not be modified.
|
||||
|
||||
The selection_mode of the GtkList determines the selection
|
||||
facilities of a GtkList and therefore the contents
|
||||
of GTK_LIST(AnyGtkList)->selection:
|
||||
|
||||
<verb>
|
||||
selection_mode GTK_LIST()->selection contents
|
||||
------------------------------------------------------
|
||||
|
||||
GTK_SELECTION_SINGLE) selection is either NULL
|
||||
or contains a GList* pointer
|
||||
for a single selected item.
|
||||
|
||||
GTK_SELECTION_BROWSE) selection is NULL if the list
|
||||
contains no widgets, otherwise
|
||||
it contains a GList* pointer
|
||||
for one GList structure.
|
||||
GTK_SELECTION_MULTIPLE) selection is NULL if no listitems
|
||||
are selected or a a GList* pointer
|
||||
for the first selected item. that
|
||||
in turn points to a GList structure
|
||||
for the second selected item and so
|
||||
on
|
||||
|
||||
GTK_SELECTION_EXTENDED) selection is NULL.
|
||||
</verb>
|
||||
|
||||
The data field of the GList structure GTK_LIST(MyGtkList)->selection points
|
||||
to the first GtkListItem that is selected. So if you would like to determine
|
||||
which listitems are selected you should go like this:
|
||||
|
||||
Upon Initialization:
|
||||
<tscreen><verb>
|
||||
{
|
||||
gchar *list_items[]={
|
||||
"Item0",
|
||||
"Item1",
|
||||
"foo",
|
||||
"last Item",
|
||||
};
|
||||
guint nlist_items=sizeof(list_items)/sizeof(list_items[0]);
|
||||
GtkWidget *list_item;
|
||||
guint i;
|
||||
|
||||
list=gtk_list_new();
|
||||
gtk_list_set_selection_mode(GTK_LIST(list), GTK_SELECTION_MULTIPLE);
|
||||
gtk_container_add(GTK_CONTAINER(AnyGtkContainer), list);
|
||||
gtk_widget_show (list);
|
||||
|
||||
for (i = 0; i < nlist_items; i++)
|
||||
{
|
||||
list_item=gtk_list_item_new_with_label(list_items[i]);
|
||||
gtk_object_set_user_data(GTK_OBJECT(list_item), (gpointer)i);
|
||||
gtk_container_add(GTK_CONTAINER(list), list_item);
|
||||
gtk_widget_show(list_item);
|
||||
}
|
||||
}
|
||||
</verb></tscreen>
|
||||
|
||||
To get known about the selection:
|
||||
<tscreen><verb>
|
||||
{
|
||||
GList *items;
|
||||
|
||||
items=GTK_LIST(list)->selection;
|
||||
|
||||
printf("Selected Items: ");
|
||||
while (items) {
|
||||
if (GTK_IS_LIST_ITEM(items->data))
|
||||
printf("%d ", (guint)
|
||||
gtk_object_get_user_data(items->data));
|
||||
items=items->next;
|
||||
}
|
||||
printf("\n");
|
||||
}
|
||||
</verb></tscreen>
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Is it possible to get some text displayed which is truncated to fit inside its allocation?
|
||||
<p>
|
||||
GTK's behavior (no clipping) is a consequence of its attempts to
|
||||
conserve X resources. Label widgets (among others) don't get their own
|
||||
X window - they just draw their contents on their parent's window.
|
||||
While it might be possible to have clipping occur by setting the clip
|
||||
mask before drawing the text, this would probably cause a substantial
|
||||
performance penalty.
|
||||
|
||||
Its possible that, in the long term, the best solution to such
|
||||
problems might be just to change gtk to give labels X windows.
|
||||
A short term workaround is to put the label widget inside another
|
||||
widget that does get it's own window - one possible candidate would
|
||||
be the viewport widget.
|
||||
|
||||
<tscreen><verb>
|
||||
viewport = gtk_viewport (NULL, NULL);
|
||||
gtk_widget_set_usize (viewport, 50, 25);
|
||||
gtk_viewport_set_shadow_type (GTK_VIEWPORT(viewport), GTK_SHADOW_NONE);
|
||||
gtk_widget_show(viewport);
|
||||
|
||||
label = gtk_label ("a really long label that won't fit");
|
||||
gtk_container_add (GTK_CONTAINER(viewport), label);
|
||||
gtk_widget_show (label);
|
||||
</verb></tscreen>
|
||||
|
||||
If you were doing this for a bunch of widgets, you might want to
|
||||
copy gtkviewport.c and strip out the adjustment and shadow
|
||||
functionality (perhaps you could call it GtkClipper).
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>How do I make menus?
|
||||
<p>
|
||||
Sascha Ziemann wrote to the gtk-list: (slightly modified)
|
||||
<quote>
|
||||
First you have to write a function for every menu: (the translate
|
||||
function returns simple strings)
|
||||
</quote>
|
||||
<tscreen><verb>
|
||||
/***********************************************************************
|
||||
** Create the File-Menu
|
||||
*/
|
||||
GtkWidget* create_file_menu (GtkWidget *window)
|
||||
{
|
||||
GtkWidget *menu;
|
||||
GtkWidget *submenu;
|
||||
GtkWidget *menuitem;
|
||||
GSList *group;
|
||||
|
||||
menu = gtk_menu_new ();
|
||||
submenu = NULL;
|
||||
group = NULL;
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-new-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-open-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
gtk_menu_line_new(GTK_MENU(menu));
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-save-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-saveas-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-saveall-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
gtk_menu_line_new(GTK_MENU(menu));
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-export-label"));
|
||||
gtk_menu_append (GTK_MENU (menu), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
return menu;
|
||||
}
|
||||
</verb></tscreen>
|
||||
<quote>
|
||||
And in your main window creation function you create a menubar in a box.
|
||||
</quote>
|
||||
<tscreen><verb>
|
||||
/*
|
||||
** base frame
|
||||
*/
|
||||
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
||||
gtk_signal_connect (GTK_OBJECT (window), "destroy",
|
||||
(GtkSignalFunc) destroy_program,
|
||||
&
|
||||
window);
|
||||
gtk_widget_set_name (window, "EDINI");
|
||||
gtk_widget_set_uposition (window, 20, 20);
|
||||
base_frame_box = gtk_vbox_new (FALSE, 10);
|
||||
gtk_container_add (GTK_CONTAINER (window), base_frame_box);
|
||||
gtk_widget_show (base_frame_box);
|
||||
|
||||
/*
|
||||
** the menu bar
|
||||
*/
|
||||
menubar = gtk_menu_bar_new ();
|
||||
gtk_box_pack_start (GTK_BOX (base_frame_box), menubar, FALSE, TRUE, 0);
|
||||
gtk_widget_show (menubar);
|
||||
|
||||
menu = create_file_menu(window);
|
||||
|
||||
menuitem = gtk_menu_item_new_with_label(translate("file-menu-label"));
|
||||
gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), menu);
|
||||
gtk_menu_bar_append (GTK_MENU_BAR (menubar), menuitem);
|
||||
gtk_widget_show (menuitem);
|
||||
|
||||
</verb></tscreen>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>Is there a better way to do the menus?
|
||||
<p>
|
||||
Jay Painter wrote to the gtk-list: (slightly modified)
|
||||
<quote>
|
||||
The best way to make menus is with gtk_menu_factory where you create a
|
||||
structure with all your menus in it, feed it to a function, and all your
|
||||
menus get created for you without 50 calls to gtk_menuitem_new. You can
|
||||
find a good example in the GZilla code. I still don't know exaclty what
|
||||
all the fields are in the structure, but NULL is always a good choice for
|
||||
those. :)
|
||||
</quote>
|
||||
|
||||
<!-- ----------------------------------------------------------------- -->
|
||||
<sect1>How can I define a separation line in a menu?
|
||||
<p>
|
||||
Just insert an empty menu item:
|
||||
|
||||
<tscreen><verb>
|
||||
menuitem = gtk_menu_item_new();
|
||||
gtk_menu_append(GTK_MENU(menu), menuitem);
|
||||
gtk_widget_show(menuitem);
|
||||
</verb></tscreen>
|
||||
|
||||
|
||||
<!-- ***************************************************************** -->
|
||||
<sect>Contributions and Maintainer
|
||||
<p>
|
||||
If you would like to make a contribution to the FAQ, send me an e-mail
|
||||
message with the exact text you think should be included (question and
|
||||
answer). With your help, this document can grow and become more useful!
|
||||
|
||||
This document is maintained by Shawn T. Amundson <
|
||||
amundson@cs.umn.edu>
|
||||
.
|
||||
|
||||
There is no guarentee that this document lives up to its intended
|
||||
purpose. This is simply provided as a free resource. As such,
|
||||
the authors and maintainer of the information provided within can
|
||||
not make any guarentee that the information is even accurate.
|
||||
|
||||
</article>
|
||||
10
docs/gtkfaq_fix
Executable file
10
docs/gtkfaq_fix
Executable file
@ -0,0 +1,10 @@
|
||||
#!/usr/bin/perl -w
|
||||
|
||||
# Stupid script to fix look of html files created with sgml2html...
|
||||
|
||||
foreach (@ARGV) {
|
||||
print "Fixing... $_\n";
|
||||
system("mv $_ $_.orig");
|
||||
system("sed -e 's/<BODY>/<BODY BGCOLOR=\"#FFFFFF\">/g' -e 's/<HR>/<HR NOSHADE>/g' $_.orig > $_");
|
||||
unlink("$_.orig");
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user