}
}
+# Get the talk directory and set environment variable $talkdir
+# which is inherited by all the scripts.
+my $talkdir = getcwd;
+$ENV{talkdir} = $talkdir;
+
# Get the files.
my @files;
my %files;
my $w = Gtk2::AboutDialog->new;
$w->set_authors ("Richard W.M. Jones");
$w->set_comments (
- "Superior technical demonstration software\n".
- "\n".
- "Keys\n".
- "↑ — Go back one slide\n".
- "↓ — Go forward one slide\n"
+ "Superior technical demonstration software\n"
);
$w->set_program_name ("Tech Talk Platinum Supreme Edition (PSE)");
$w->set_version ("@VERSION@");
$w->run;
print STDERR "calling \$w->destroy on about dialog\n" if $verbose;
$w->destroy;
+
+ # The dialog doesn't really get destroyed here. We have
+ # to add this hack to really destroy it.
+ Glib::Idle->add (sub { Gtk2->main_quit; return FALSE; });
+ Gtk2->main;
}
MAIN: while (1) {
# Display an HTML page.
if ($slide->{ext} eq "html") {
# MozEmbed is incredibly crashy, so we run ourself as a
- # subprocess, so when it segfaults we don't care.
+ # subprocess, so when it segfaults we don't care. If all goes
+ # well and it doesn't crash, it should print a line 'RESULT FOO'
+ # where 'FOO' is the instruction (eg. 'NEXT', 'PREV', 'QUIT' etc).
my @cmd = ($0, "--mozembed");
push @cmd, "--mozembed-first" if exists $slide->{first};
push @cmd, "--mozembed-last" if exists $slide->{last};
- my $cwd = getcwd;
- my $url = "file://" . $cwd . "/" . $slide->{name};
+ my $url = "file://$talkdir/" . $slide->{name};
push @cmd, $url;
- system (@cmd);
- die "failed to execute subcommand: ", join(" ", @cmd), ": $!\n"
- if $? == -1;
- if ($? & 127) {
- # Subcommand probably segfaulted, just continue to next slide.
- return "NEXT";
- } else {
- my $r = $? >> 8;
- if ($r == 0) {
- return "NEXT";
- } elsif ($r == 1) {
- return "PREV";
- } elsif ($r == 2) {
- return "QUIT";
+ print STDERR "running subcommand: ", join (" ", @cmd), "\n"
+ if $verbose;
+ open CMD, "-|", @cmd
+ or die "failed to execute subcommand: ", join(" ", @cmd), ": $!\n";
+ my $r;
+ while (<CMD>) {
+ if (/^RESULT ([A-Z]+.*)/) {
+ $r = $1;
+ print STDERR "subcommand result: $r\n" if $verbose;
+ last;
}
}
+ # No RESULT line? Subcommand probably segfaulted, just
+ # continue to next slide.
+ $r ||= "NEXT";
+ return $r;
}
# Run a shell command.
elsif ($slide->{ext} eq "sh") {
# killing the whole program.
sub run_mozembed
{
- my $r = 0;
-
my $w = Gtk2::Window->new ();
my $vbox = Gtk2::VBox->new ();
my $moz = Gtk2::MozEmbed->new ();
$w->add ($vbox);
my $bnext = Gtk2::Button->new ("Next slide");
- $bnext->signal_connect (clicked => sub { $r = 0; $w->destroy });
+ $bnext->signal_connect (clicked =>
+ sub { print "RESULT NEXT\n"; $w->destroy });
$bnext->set_sensitive (!$mozembed_last);
$bbox->add ($bnext);
my $bback = Gtk2::Button->new ("Back");
- $bback->signal_connect (clicked => sub { $r = 1; $w->destroy });
+ $bback->signal_connect (clicked =>
+ sub { print "RESULT PREV\n"; $w->destroy });
$bback->set_sensitive (!$mozembed_first);
$bbox->add ($bback);
my $bquit = Gtk2::Button->new ("Quit");
- $bquit->signal_connect (clicked => sub { $r = 2; $w->destroy });
+ $bquit->signal_connect (clicked =>
+ sub { print "RESULT QUIT\n"; $w->destroy });
$bbox->add ($bquit);
$bbox->set_child_secondary ($bquit, 1);
$moz->load_url ($ARGV[0]);
Gtk2->main;
- exit $r;
+ exit 0;
}
1;
my slides in a single file (C<style.css>), and I have one place where
I can add all Javascript, if I need to use any (C<code.js>).
+=head3 BACKGROUNDS, FONTS AND LOGOS
+
To add a common background and font size to all slides, put this in
C<style.css>:
background: url(background-image.jpg) no-repeat;
}
+To add a logo in one corner:
+
+ body {
+ background: url(logo.jpg) top right no-repeat;
+ }
+
+=head3 SCALING AND CENTERING
+
Scaling slide text and images so that they appear at the same
proportionate size for any screen resolution can be done using
Javascript. (See
L<https://developer.mozilla.org/En/DOM/window.innerHeight>).
+If you want to center text horizontally, use CSS, eg:
+
+ p.center {
+ text-align: center;
+ }
+
+To center text vertically, CSS3 is supposed to offer a solution some
+time, but while you're waiting for that try
+L<http://www.w3.org/Style/Examples/007/center#vertical>.
+
+=head3 PREVIEWING HTML
+
+I find it helpful to have Firefox open to display the HTML files and
+styles as I edit them. Just start firefox in the talk directory:
+
+ firefox file://$(pwd) &
+
+When you edit an HTML file, click the Firefox reload button to
+immediately see your changes.
+
+Tech Talk PSE uses Mozilla embedding to display HTML, which uses the
+same Mozilla engine as Firefox, so what you should see in Firefox
+should be identical to what Tech Talk PSE displays.
+
=head2 CREATING FIGURES
Use your favorite tool to draw the figure, convert it to an image (in
In C<functions>, I have:
# -*- shell-script -*-
+
+ # Place any local environment variables required in 'local'.
+ if [ -f local ]; then source local; fi
+
export PS1="$ "
- export HISTFILE=/tmp/history
+
+ export HISTFILE=$talkdir/history
+
rm -f $HISTFILE
+ touch $HISTFILE
add_history ()
{
terminal ()
{
+ # Make $HISTFILE unwritable so the shell won't update it
+ # when it exits.
+ chmod -w $HISTFILE
+
+ # Run gnome-terminal.
exec \
gnome-terminal \
--window \
the directory containing the talk files, so the same rules about using
relative paths apply there too.
+The environment variable C<$talkdir> is exported to scripts and it
+contains the absolute path of the directory containing the talk files.
+When a script is run, the current directory is the same as
+C<$talkdir>, but if your script changes directory (eg. into a
+subdirectory containing supporting files) then it can be useful to use
+C<$talkdir> to refer back to the original directory.
+
=head1 WHAT MAKES A GOOD TALK
I like what Edward Tufte writes, for example his evisceration of
git.annexia.org / techtalk-pse.git / blobdiff