[ViewVC] Annotation of: cvs/CV/bin/cv

#!/opt/bin/perl

use Cwd ();
use Encode ();

use Gtk2 -init;
use Gtk2::Gdk::Keysyms;

use Gtk2::CV;

use Gtk2::CV::ImageWindow;
use Gtk2::CV::Schnauzer;

BEGIN {
   require Gtk2::CV::Plugin;
   require "$ENV{HOME}/.cvrc" if -r "$ENV{HOME}/.cvrc";
}

use Gtk2::CV::Plugin::NameCluster;
use Gtk2::CV::Plugin::RCluster;

Gtk2::Rc->parse (Gtk2::CV::find_rcfile "gtkrc");

use File::Spec;

my $mainwin;
my $viewer;
my $viewer_count;
my $schnauzer;
my $info;
my $help;

my $schnauzer_idx = 0;

sub new_schnauzer {
   my $s = new Gtk2::CV::Schnauzer;

   $s->signal_connect_after (key_press_event => \&std_keys);
   $s->signal_connect (activate => sub {
      my $label = sprintf "%s (%d)",
                  (File::Spec->splitpath ($_[1]))[2],
                  -s $_[1];
      $info->set_label ($label);
      $viewer->load_image ($_[1]) if $viewer; # TODO: error, or chose ANY viewer
   });

   Gtk2::CV::Plugin->call (new_schnauzer => $s);

   $s
}

sub new_viewer {
   my $self = new Gtk2::CV::ImageWindow;

   $viewer_count++;

   $self->set_title ("CV: Image");

   $self->signal_connect (key_press_event => sub {
      $viewer = $_[0];

      my $key = $_[1]->keyval;
      my $state = $_[1]->state;

      if ($state * "control-mask" && $key == $Gtk2::Gdk::Keysyms{c}) {
         my $viewer = new_viewer ();
         $viewer->set_image ($_[0]->{image});
         $viewer->show_all;
         1
      } else {
         &std_keys
            or $schnauzer->signal_emit (key_press_event => $_[1])
      }
   });
   $self->signal_connect (delete_event => sub { $_[0]->destroy; 0 });
   $self->signal_connect (destroy => sub {
      $viewer = undef if $viewer == $_[0];

      main_quit Gtk2 unless --$viewer_count;

      0
   });

   $self->signal_connect (button3_press_event => sub {
      $mainwin->visible
         ? $mainwin->hide
         : $mainwin->show_all;

      1
   });

   Gtk2::CV::Plugin->call (new_imagewindow => $self);

   $self
}

sub std_keys {
   my $key = $_[1]->keyval;
   my $state = $_[1]->state;

   my $ctrl = $state * "control-mask";

   if ($key == $Gtk2::Gdk::Keysyms{q}) {
      $viewer->destroy;
   } elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{v}) {
      my $w = new Gtk2::Window;

      $w->set_title ("CV: Schnauzer");
      $w->add (my $s = new_schnauzer);
      $s->set_dir (File::Spec->curdir);
      $s->set_geometry_hints;
      $w->show_all;

   } elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{h}) {
      unless ($help) {
         require Gtk2::PodViewer;

         $help = new Gtk2::Window;
         $help->set_title ("CV: Help");
         $help->set_default_size (500, 300);
         $help->signal_connect (delete_event => sub { $help->hide; 1 });

         $help->add (my $sw = new Gtk2::ScrolledWindow);
         $sw->add (my $h = new Gtk2::PodViewer);

         #binmode DATA, ":utf8";
         $h->load_string (do { local $/; <DATA> });
      }

      $help->show_all;
   } else {
      return 0;
   }

   1
}

{
   $viewer = new_viewer;
   $::cur_viewer = $viewer;

   $schnauzer = new_schnauzer;

   $mainwin = new Gtk2::Window;
   $mainwin->set_title ("CV");
   $mainwin->add (my $vbox = new Gtk2::VBox);
   $mainwin->signal_connect (delete_event => sub { $mainwin->hide; 1 });

   $vbox->add ($schnauzer);
   $vbox->pack_end (my $frame = new Gtk2::Frame, 0, 0, 0);
   $frame->add (my $hbox = new Gtk2::HBox 0, 0);
   $hbox->pack_start ((new Gtk2::Label "Info: "), 0, 0, 0);
   $hbox->pack_end   (my $labelwindow = new Gtk2::EventBox, 1, 1, 0);
   $labelwindow->add ($info = new Gtk2::Label);
   $labelwindow->signal_connect_after (size_request => sub { $_[1]->width (0); 0 });
   $info->set (selectable => 1, xalign => 0, justify => "left");

   $schnauzer->set_geometry_hints;
}

if (@ARGV) {
   @ARGV == 1 && -d $ARGV[0]
      ? $schnauzer->set_dir (Glib::filename_to_unicode shift)
      : $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV], 1);
   $schnauzer->show_all;
   $schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
} else {
   $schnauzer->set_dir (File::Spec->curdir);
   $mainwin->show_all;
}

$viewer->show_all;

main Gtk2;

__DATA__

=encoding utf-8

=head1 NAME

cv - a fast gtk+ image viewer loosely modeled after XV

=head1 SYNOPSIS

   cv [file...]

=head1 FEATURES

CV is supposed to work similar to the venerable XV image viewer, just
faster. Why faster?

=over 4

=item * optimized directory scanning algorithm

The directory scanning in CV uses some tricks that - on most modern
filesystems - makes it possible to detect filetypes faster than stat()'ing
every file. This makes CV suitable for directories with lots of files
(10000+).

This algorithm is quite unprecise - it doesn't make a difference between
files, device nodes, symlinks and the like, and filetype detection is done
using the file extension only.

On the positive side, it is usually many orders of magnitude faster than
traditional scanning techniques (good for directories with 10000 or
100000+ files).

=item * queuing for all time-consuming background tasks

All tasks, such as unlinking files or generating thumbnails, that can be
done in the background will be done so - no waiting required, even when
changing directories.

=item * use of asynchronous I/O

CV tries to use asynchronous I/O whereever it makes sense, for example
while scanning directories, waiting for stat data, unlinking files or
generating thumbnails. This usually decreases scanning times for large
directories a bit (especially on RAID devices and over NFS) and makes CV
much more interactive.

=item * fast image loading

The time span between the user issuing a command and displaying the new
image should be as small as possible. CV uses optimized (especially
for JPEG) loading functions and sacrifices some quality (e.g no gamma
correction, although this might change) to achieve this speed.

=item * fast thumbnail creation

Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, so
on modern CPUs, thumbnailing is usually limited by I/O speed. Thumbnail
creation for JPEGs has been specially optimized and can even take
advantage of multiple CPUs.

=item * minimum optical clutter

CV has no menus or other user interface elements that take up a lot of
screen space (or are useful for beginning users). The schnauzer windows
can also be somewhat crowded.

The point of an image viewer is viewing images, not a nice GUI. This is
similar to XV's behaviour.

=item * efficient (and hard to learn) user interface

CV uses key combinations. A lot. If you are an experienced XV user, you
will find most of these keys familiar. If not, CV might be hard to use at
first, but will be an efficient tool later.

=item * multi-window GUI

CV doesn't force you to use a specific layout, instead it relies on your
window manager, thus enabling you to chose whatever layout that suits you
most.

=item * i18n'ed filename handling throughout

As long as glib can recognize your filename encoding (either UTF-8 or
locale-specific, depending on the setting of G_BROKEN_FILENAMES) and you
have the relevant fonts, CV will display your filenames correctly.

=item * extensible through plug-ins

I have weird plug-ins that access remote databases to find a
directory. This is not likely to be of any use to other people. Likewise,
others might have weird requirements I cannot dream of.

=item * filename clustering

Among the standard plug-ins is a filename clustering plug-in, that (in
case of tens of thousands images in one directory) might be able to
cluster similar names together.

=back

=head1 DESCRIPTION

=head2 THE IMAGE WINDOW

You can use the following keys in the image window:

 q            quit the program
 <            half the image size
 >            double the image size
 ,            shrink the image by 10%
 .            enlarge the image by 10%
 n            reset to normal size
 m            maximize to screensize
 M            maximize to screensize, respecting image aspect
 ctrl-m       toggle maxpect-always mode
 ctrl-sift-m  toggle using current image size as max image size
 u            uncrop
 r            set scaling mode to 'nearest' (fastest)
 s            set scaling mode to 'bilinear' (default)
 shift-s      set scaling mode to 'hyper' (slowest)
 t            rotate clockwise 90°
 T            rotate counterclockwise°
 a            apply all rotations loslessly to a jpeg file (using exiftran)
 ctrl-v       open a new visual schnauzer window for the current dir
 ctrl-c       clone the current image window
 ctrl-e       run an editor ($CV_EDITOR or "gimp") on the current image
 ctrl-p       fire up the print dialog
 escape       cancel a crop action

And when playing movies, these additional keys are active:

 left         rewind by 10 seconds
 right        forward by 10 seconds
 down         rewind by 60 seconds
 up           forward by 60 seconds
 pg_up        rewind by 600 seconds
 pg_down      forward by 600 seconds
 o            toggle on-screen display
 p            pause/unpause
 escape       stop playing
 9            turn volume down
 0            turn volume up

Any other keys will be sent to the default schnauzer window, which can be
toggled on and off by right-clicking into the image window.

Left-clicking into the image window will let you crop the image (usually
to zoom into large images that CV scales down).

=head2 THE VISUAL SCHNAUZER

Any image-loading action in a schnauzer window acts on the
"last-recently-activated" imagewindow, which currently is simply the last
image window that received a keypress.

You can use the following keys in the schnauzer window:

 ctrl-space,
 space        move to and display next image
 ctrl-backspace,
 backspace    move to and display previous image
 ctrl-return,
 return       display selected picture, or enter directory

 cursor keys  move selection
 page-up      move one page up
 page-down    move one page down
 home         move to first file
 end          move to last file

 ctrl-a       select all files
 ctrl-shift-a select all files currently displayed in the schnauzer window
 ctrl-d       delete selected files WITHOUT ASKING AGAIN
 ctrl-g       force generation of thumbnais for the selected files
 ctrl-s       rescan current direcory or files updates/deletes etc.
 ctrl-u       update selected (or all) icons if neccessary
 ctrl-l       don't use, will become a plug-in eventually

 ^            go to parent directory (caret).

 0-9,
 a-z          find the first filename beginning with this letter

Right-clicking into the schnauzer window displays a pop-up menu with
additional actions.

=head3 SELECTION

You can select entries in the Schnauzer in a variety of ways:

=over 4

=item Keyboard

Moving the cursor with the keyboard will first deselect all files and then
select the file you moved to.

=item Clicking

Clicking on an entry will select the one you clicked and deselect all
others.

=item Shift-Clicking

Shift-clicking will toggle the selection on the entry under the mouse.

=item Dragging

Dragging will select all entries between the one selected when pushing the
button and the one selected when releasing the button. If you move above
or below the schnauzer area while drag-selecting, the schnauzer will move
up/down one row twice per second. In addition, horizontal mouse movement
acts as a kind of invisible horizontal scrollbar.

=item Hint: double-click works while click-selecting

You can double-click any image while click-selecting to display it
without stopping the selection process. This will act as if you normally
double-clicked the image to display it, and will toggle the selection
twice, resulting in no change.

=back

=head1 FILES

When starting, CV runs the F<.cvrc> file in your F<$HOME> directory as if
it were a perl script. in that, you will mostly load plug-ins.

Example:

   system "fping -q -t 10 ether"
     or require "/fs/cv/cvplugin.pl";

This will load a plug-in, but only if the machine I<ether> is reachable
(supposedly the plug-in is networked in some way :).

=head1 ENVIRONMENT

=over 4

=item CV_EDITOR

The program that gets executed when the user presses C<CTRL-e> in the
Schnauzer or image window. The default is C<gimp>.

=item CV_PRINT_DESTINATION

The default (perl-style) destination to use in the print dialog.

=item CV_TRASHCAN

When set, must point to a directory where all files that are deleted are
moved to. If unset, files that are deleted are really being deleted.

=back

=head1 SECURITY CONSIDERATIONS

CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe for
this purpose, though (from the gtk-2.2 release notes):

"While efforts have been made to make gdk-pixbuf robust against invalid
images, using gdk-pixbuf to load untrusted data is not recommended, due to
the likelyhood that there are additional problems where an invalid image
could cause gdk-pixbuf to crash or worse."

=head1 BUGS/TODO

 Lots of functionality is missing.

 Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with
 names incompatible with utf-8 might fail.

 rotate on disk
 lots of ui issues
 save(?)
 preferences

=head1 AUTHOR

Marc Lehmann <cv@plan9.de>.

=cut

Revision:	1.65
Committed:	Fri Jan 13 01:08:06 2006 UTC (18 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.64:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#!/opt/bin/perl
2
3	root	1.37	use Cwd ();
4			use Encode ();
5
6	root	1.12	use Gtk2 -init;
7			use Gtk2::Gdk::Keysyms;
8
9	root	1.48	use Gtk2::CV;
10
11	root	1.12	use Gtk2::CV::ImageWindow;
12			use Gtk2::CV::Schnauzer;
13
14	root	1.48	BEGIN {
15			require Gtk2::CV::Plugin;
16			require "$ENV{HOME}/.cvrc" if -r "$ENV{HOME}/.cvrc";
17			}
18
19			use Gtk2::CV::Plugin::NameCluster;
20			use Gtk2::CV::Plugin::RCluster;
21	root	1.16
22			Gtk2::Rc->parse (Gtk2::CV::find_rcfile "gtkrc");
23
24	root	1.20	use File::Spec;
25
26			my $mainwin;
27	root	1.12	my $viewer;
28	root	1.62	my $viewer_count;
29	root	1.12	my $schnauzer;
30	root	1.20	my $info;
31	root	1.21	my $help;
32	root	1.12
33	root	1.25	my $schnauzer_idx = 0;
34
35	root	1.12	sub new_schnauzer {
36	root	1.20	my $s = new Gtk2::CV::Schnauzer;
37	root	1.12
38			$s->signal_connect_after (key_press_event => \&std_keys);
39	root	1.20	$s->signal_connect (activate => sub {
40			my $label = sprintf "%s (%d)",
41			(File::Spec->splitpath ($_[1]))[2],
42			-s $_[1];
43			$info->set_label ($label);
44	root	1.62	$viewer->load_image ($_[1]) if $viewer; # TODO: error, or chose ANY viewer
45	root	1.20	});
46	root	1.12
47	root	1.40	Gtk2::CV::Plugin->call (new_schnauzer => $s);
48
49	root	1.53	$s
50	root	1.12	}
51
52	root	1.62	sub new_viewer {
53			my $self = new Gtk2::CV::ImageWindow;
54
55			$viewer_count++;
56
57			$self->set_title ("CV: Image");
58
59			$self->signal_connect (key_press_event => sub {
60			$viewer = $_[0];
61
62			my $key = $_[1]->keyval;
63			my $state = $_[1]->state;
64
65			if ($state * "control-mask" && $key == $Gtk2::Gdk::Keysyms{c}) {
66			my $viewer = new_viewer ();
67			$viewer->set_image ($_[0]->{image});
68			$viewer->show_all;
69			1
70			} else {
71			&std_keys
72			or $schnauzer->signal_emit (key_press_event => $_[1])
73			}
74			});
75	root	1.63	$self->signal_connect (delete_event => sub { $_[0]->destroy; 0 });
76	root	1.62	$self->signal_connect (destroy => sub {
77			$viewer = undef if $viewer == $_[0];
78
79			main_quit Gtk2 unless --$viewer_count;
80	root	1.63
81			0
82	root	1.62	});
83
84			$self->signal_connect (button3_press_event => sub {
85			$mainwin->visible
86			? $mainwin->hide
87			: $mainwin->show_all;
88	root	1.63
89	root	1.62	1
90			});
91
92			Gtk2::CV::Plugin->call (new_imagewindow => $self);
93
94			$self
95			}
96
97	root	1.12	sub std_keys {
98			my $key = $_[1]->keyval;
99			my $state = $_[1]->state;
100
101	root	1.21	my $ctrl = $state * "control-mask";
102	root	1.12
103			if ($key == $Gtk2::Gdk::Keysyms{q}) {
104	root	1.62	$viewer->destroy;
105	root	1.12	} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{v}) {
106	root	1.20	my $w = new Gtk2::Window;
107	root	1.26
108			$w->set_title ("CV: Schnauzer");
109	root	1.20	$w->add (my $s = new_schnauzer);
110			$s->set_dir (File::Spec->curdir);
111	root	1.25	$s->set_geometry_hints;
112	root	1.21	$w->show_all;
113	root	1.25
114	root	1.21	} elsif ($ctrl && $key == $Gtk2::Gdk::Keysyms{h}) {
115			unless ($help) {
116			require Gtk2::PodViewer;
117
118			$help = new Gtk2::Window;
119	root	1.26	$help->set_title ("CV: Help");
120	root	1.21	$help->set_default_size (500, 300);
121			$help->signal_connect (delete_event => sub { $help->hide; 1 });
122
123			$help->add (my $sw = new Gtk2::ScrolledWindow);
124			$sw->add (my $h = new Gtk2::PodViewer);
125
126			#binmode DATA, ":utf8";
127			$h->load_string (do { local $/; <DATA> });
128			}
129
130			$help->show_all;
131	root	1.12	} else {
132	root	1.43	return 0;
133	root	1.12	}
134
135	root	1.43	1
136	root	1.12	}
137
138	root	1.20	{
139	root	1.62	$viewer = new_viewer;
140			$::cur_viewer = $viewer;
141	root	1.40
142	root	1.20	$schnauzer = new_schnauzer;
143
144			$mainwin = new Gtk2::Window;
145			$mainwin->set_title ("CV");
146			$mainwin->add (my $vbox = new Gtk2::VBox);
147	root	1.53	$mainwin->signal_connect (delete_event => sub { $mainwin->hide; 1 });
148	root	1.20
149			$vbox->add ($schnauzer);
150	root	1.22	$vbox->pack_end (my $frame = new Gtk2::Frame, 0, 0, 0);
151	root	1.20	$frame->add (my $hbox = new Gtk2::HBox 0, 0);
152	root	1.45	$hbox->pack_start ((new Gtk2::Label "Info: "), 0, 0, 0);
153			$hbox->pack_end (my $labelwindow = new Gtk2::EventBox, 1, 1, 0);
154			$labelwindow->add ($info = new Gtk2::Label);
155			$labelwindow->signal_connect_after (size_request => sub { $_[1]->width (0); 0 });
156			$info->set (selectable => 1, xalign => 0, justify => "left");
157	root	1.25
158			$schnauzer->set_geometry_hints;
159	root	1.20	}
160	root	1.12
161			if (@ARGV) {
162	root	1.52	@ARGV == 1 && -d $ARGV[0]
163			? $schnauzer->set_dir (Glib::filename_to_unicode shift)
164	root	1.65	: $schnauzer->set_paths ([map Glib::filename_to_unicode $_, @ARGV], 1);
165	root	1.31	$schnauzer->show_all;
166	root	1.18	$schnauzer->handle_key ($Gtk2::Gdk::Keysyms{space}, []);
167	root	1.17	} else {
168	root	1.20	$schnauzer->set_dir (File::Spec->curdir);
169	root	1.19	$mainwin->show_all;
170	root	1.12	}
171
172	root	1.35	$viewer->show_all;
173
174	root	1.12	main Gtk2;
175	root	1.21
176			__DATA__
177	root	1.12
178	root	1.58	=encoding utf-8
179
180	root	1.11	=head1 NAME
181
182	root	1.47	cv - a fast gtk+ image viewer loosely modeled after XV
183	root	1.11
184			=head1 SYNOPSIS
185
186			cv [file...]
187
188	root	1.47	=head1 FEATURES
189
190			CV is supposed to work similar to the venerable XV image viewer, just
191			faster. Why faster?
192
193			=over 4
194
195			=item * optimized directory scanning algorithm
196
197	root	1.55	The directory scanning in CV uses some tricks that - on most modern
198	root	1.47	filesystems - makes it possible to detect filetypes faster than stat()'ing
199			every file. This makes CV suitable for directories with lots of files
200			(10000+).
201
202			This algorithm is quite unprecise - it doesn't make a difference between
203			files, device nodes, symlinks and the like, and filetype detection is done
204			using the file extension only.
205
206	root	1.55	On the positive side, it is usually many orders of magnitude faster than
207			traditional scanning techniques (good for directories with 10000 or
208			100000+ files).
209
210	root	1.53	=item * queuing for all time-consuming background tasks
211
212			All tasks, such as unlinking files or generating thumbnails, that can be
213			done in the background will be done so - no waiting required, even when
214			changing directories.
215
216	root	1.47	=item * use of asynchronous I/O
217
218			CV tries to use asynchronous I/O whereever it makes sense, for example
219	root	1.53	while scanning directories, waiting for stat data, unlinking files or
220			generating thumbnails. This usually decreases scanning times for large
221			directories a bit (especially on RAID devices and over NFS) and makes CV
222			much more interactive.
223	root	1.47
224			=item * fast image loading
225
226			The time span between the user issuing a command and displaying the new
227			image should be as small as possible. CV uses optimized (especially
228			for JPEG) loading functions and sacrifices some quality (e.g no gamma
229	root	1.55	correction, although this might change) to achieve this speed.
230	root	1.47
231			=item * fast thumbnail creation
232
233	root	1.55	Thumbnail creation uses both CPU and Disk-I/O. CV interleaves both, so
234			on modern CPUs, thumbnailing is usually limited by I/O speed. Thumbnail
235			creation for JPEGs has been specially optimized and can even take
236			advantage of multiple CPUs.
237	root	1.47
238			=item * minimum optical clutter
239
240			CV has no menus or other user interface elements that take up a lot of
241	root	1.55	screen space (or are useful for beginning users). The schnauzer windows
242			can also be somewhat crowded.
243	root	1.47
244			The point of an image viewer is viewing images, not a nice GUI. This is
245			similar to XV's behaviour.
246
247			=item * efficient (and hard to learn) user interface
248
249			CV uses key combinations. A lot. If you are an experienced XV user, you
250			will find most of these keys familiar. If not, CV might be hard to use at
251			first, but will be an efficient tool later.
252
253	root	1.55	=item * multi-window GUI
254
255			CV doesn't force you to use a specific layout, instead it relies on your
256			window manager, thus enabling you to chose whatever layout that suits you
257			most.
258
259	root	1.47	=item * i18n'ed filename handling throughout
260
261			As long as glib can recognize your filename encoding (either UTF-8 or
262	root	1.55	locale-specific, depending on the setting of G_BROKEN_FILENAMES) and you
263			have the relevant fonts, CV will display your filenames correctly.
264	root	1.47
265			=item * extensible through plug-ins
266
267			I have weird plug-ins that access remote databases to find a
268			directory. This is not likely to be of any use to other people. Likewise,
269			others might have weird requirements I cannot dream of.
270
271			=item * filename clustering
272
273			Among the standard plug-ins is a filename clustering plug-in, that (in
274			case of tens of thousands images in one directory) might be able to
275			cluster similar names together.
276
277			=back
278
279	root	1.11	=head1 DESCRIPTION
280
281			=head2 THE IMAGE WINDOW
282
283			You can use the following keys in the image window:
284
285	root	1.50	q quit the program
286			< half the image size
287			> double the image size
288			, shrink the image by 10%
289			. enlarge the image by 10%
290			n reset to normal size
291			m maximize to screensize
292			M maximize to screensize, respecting image aspect
293			ctrl-m toggle maxpect-always mode
294	root	1.59	ctrl-sift-m toggle using current image size as max image size
295	root	1.50	u uncrop
296			r set scaling mode to 'nearest' (fastest)
297			s set scaling mode to 'bilinear' (default)
298			shift-s set scaling mode to 'hyper' (slowest)
299			t rotate clockwise 90°
300			T rotate counterclockwise°
301	root	1.64	a apply all rotations loslessly to a jpeg file (using exiftran)
302	root	1.50	ctrl-v open a new visual schnauzer window for the current dir
303	root	1.63	ctrl-c clone the current image window
304	root	1.50	ctrl-e run an editor ($CV_EDITOR or "gimp") on the current image
305	root	1.57	ctrl-p fire up the print dialog
306	root	1.50	escape cancel a crop action
307	root	1.11
308	root	1.33	And when playing movies, these additional keys are active:
309
310	root	1.50	left rewind by 10 seconds
311			right forward by 10 seconds
312			down rewind by 60 seconds
313			up forward by 60 seconds
314			pg_up rewind by 600 seconds
315			pg_down forward by 600 seconds
316			o toggle on-screen display
317			p pause/unpause
318			escape stop playing
319			9 turn volume down
320			0 turn volume up
321	root	1.33
322	root	1.47	Any other keys will be sent to the default schnauzer window, which can be
323			toggled on and off by right-clicking into the image window.
324	root	1.11
325	root	1.47	Left-clicking into the image window will let you crop the image (usually
326			to zoom into large images that CV scales down).
327	root	1.11
328			=head2 THE VISUAL SCHNAUZER
329
330	root	1.63	Any image-loading action in a schnauzer window acts on the
331			"last-recently-activated" imagewindow, which currently is simply the last
332			image window that received a keypress.
333
334	root	1.11	You can use the following keys in the schnauzer window:
335
336	root	1.47	ctrl-space,
337	root	1.50	space move to and display next image
338	root	1.47	ctrl-backspace,
339	root	1.50	backspace move to and display previous image
340	root	1.47	ctrl-return,
341	root	1.50	return display selected picture, or enter directory
342	root	1.11
343	root	1.50	cursor keys move selection
344			page-up move one page up
345			page-down move one page down
346			home move to first file
347			end move to last file
348
349			ctrl-a select all files
350			ctrl-shift-a select all files currently displayed in the schnauzer window
351			ctrl-d delete selected files WITHOUT ASKING AGAIN
352			ctrl-g force generation of thumbnais for the selected files
353			ctrl-s rescan current direcory or files updates/deletes etc.
354			ctrl-u update selected (or all) icons if neccessary
355			ctrl-l don't use, will become a plug-in eventually
356	root	1.47
357	root	1.56	^ go to parent directory (caret).
358
359	root	1.47	0-9,
360	root	1.50	a-z find the first filename beginning with this letter
361	root	1.47
362			Right-clicking into the schnauzer window displays a pop-up menu with
363			additional actions.
364
365	root	1.60	=head3 SELECTION
366
367			You can select entries in the Schnauzer in a variety of ways:
368
369			=over 4
370
371			=item Keyboard
372
373			Moving the cursor with the keyboard will first deselect all files and then
374			select the file you moved to.
375
376	root	1.61	=item Clicking
377	root	1.60
378	root	1.61	Clicking on an entry will select the one you clicked and deselect all
379			others.
380	root	1.60
381	root	1.61	=item Shift-Clicking
382
383			Shift-clicking will toggle the selection on the entry under the mouse.
384
385			=item Dragging
386	root	1.60
387			Dragging will select all entries between the one selected when pushing the
388			button and the one selected when releasing the button. If you move above
389			or below the schnauzer area while drag-selecting, the schnauzer will move
390			up/down one row twice per second. In addition, horizontal mouse movement
391			acts as a kind of invisible horizontal scrollbar.
392
393			=item Hint: double-click works while click-selecting
394
395			You can double-click any image while click-selecting to display it
396			without stopping the selection process. This will act as if you normally
397			double-clicked the image to display it, and will toggle the selection
398			twice, resulting in no change.
399
400			=back
401
402	root	1.47	=head1 FILES
403
404			When starting, CV runs the F<.cvrc> file in your F<$HOME> directory as if
405			it were a perl script. in that, you will mostly load plug-ins.
406
407			Example:
408
409			system "fping -q -t 10 ether"
410			or require "/fs/cv/cvplugin.pl";
411
412			This will load a plug-in, but only if the machine I<ether> is reachable
413			(supposedly the plug-in is networked in some way :).
414	root	1.11
415	root	1.27	=head1 ENVIRONMENT
416
417			=over 4
418
419	root	1.38	=item CV_EDITOR
420
421			The program that gets executed when the user presses C<CTRL-e> in the
422			Schnauzer or image window. The default is C<gimp>.
423
424	root	1.27	=item CV_PRINT_DESTINATION
425
426			The default (perl-style) destination to use in the print dialog.
427
428	root	1.38	=item CV_TRASHCAN
429
430			When set, must point to a directory where all files that are deleted are
431			moved to. If unset, files that are deleted are really being deleted.
432
433	root	1.27	=back
434
435	root	1.23	=head1 SECURITY CONSIDERATIONS
436
437	root	1.54	CV uses Pixbuf to load non-JPEG images. Pixbuf is not considered safe for
438			this purpose, though (from the gtk-2.2 release notes):
439	root	1.23
440			"While efforts have been made to make gdk-pixbuf robust against invalid
441			images, using gdk-pixbuf to load untrusted data is not recommended, due to
442			the likelyhood that there are additional problems where an invalid image
443			could cause gdk-pixbuf to crash or worse."
444
445	root	1.11	=head1 BUGS/TODO
446	root	1.23
447	root	1.47	Lots of functionality is missing.
448
449			Pixbuf doesn't always honor G_BROKEN_FILENAMES, so accessing files with
450	root	1.54	names incompatible with utf-8 might fail.
451	root	1.11
452			rotate on disk
453			lots of ui issues
454			save(?)
455			preferences
456
457			=head1 AUTHOR
458
459			Marc Lehmann <cv@plan9.de>.
460
461			=cut
462	root	1.1