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present.py
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present.py
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#!/usr/bin/python3
# present.py - show two pdf presentations in sync (e.g., to show notes on a second screen)
# Benjamin Richter, Feb 2014
# use something like this with i3
# for_window [window_role="presentation_slides"] move container to output VGA1; fullscreen
# for_window [window_role="presentation_notes"] move container to output LVDS1
import os.path
import argparse
from gi.repository import GLib, Gtk, Gdk, Gio, Poppler
import cairo
from datetime import datetime
import time
class Stopwatch(object):
def __init__(self):
self.started = time.time()
self.paused = self.started
self.offset = 0
def restart(self):
self.started = time.time()
self.paused = None
self.offset = 0
return self.started
def get_time(self):
now = time.time()
t = now - self.started
if self.paused is not None:
t -= now - self.paused
t -= self.offset
return t
def is_paused(self):
return self.paused is not None
def pause(self):
self.paused = time.time()
def resume(self):
self.offset += time.time() - self.paused
self.paused = None
class PdfWindow(Gtk.Window):
def __init__(self, role, clip, title_format, show_meta=False):
Gtk.Window.__init__(self)
self.page_idx = None
self.clip = clip
self.title_format = title_format
self.show_meta = show_meta
self.set_role(role)
self.connect("delete-event", Gtk.main_quit)
self.connect("key-press-event", key_pressed)
self.connect("draw", self.draw_slides)
self.set_app_paintable(True)
GLib.timeout_add(500, self.redraw_regularily)
def redraw_regularily(self):
self.queue_draw()
return True
def reload_document(self):
self.document = Poppler.Document.new_from_file(self.gio_file.get_uri(), None)
self.set_title(self.title_format.format(self.document.get_title()))
self.queue_draw()
def load_document(self, src):
self.gio_file = Gio.File.new_for_path(src)
self.reload_document()
self.monitor = self.gio_file.monitor_file(Gio.FileMonitorFlags.NONE, None)
def file_changed(monitor, old, new, ev):
if ev != Gio.FileMonitorEvent.CHANGES_DONE_HINT:
return
GLib.timeout_add(100, self.reload_document)
self.monitor.connect("changed", file_changed)
def draw_slides(self, widget, cr):
if self.show_meta and slides_window.page_idx is not None:
cr.set_source_rgb(0.4, 0.4, 0.8)
else:
cr.set_source_rgb(0, 0, 0)
cr.paint()
rect = widget.get_allocation()
if self.page_idx is not None:
page = self.document.get_page(self.page_idx)
else:
page = self.document.get_page(page_idx)
page_width, page_height = page.get_size()
clip_left = page_width * self.clip[0]
clip_top = page_height * self.clip[1]
clip_right = page_width * self.clip[2]
clip_bottom = page_height * self.clip[3]
clip_width = clip_right - clip_left
clip_height = clip_bottom - clip_top
if clip_width/clip_height <= rect.width/rect.height:
scale = rect.height / clip_height
else:
scale = rect.width / clip_width
win_width = rect.width / scale
win_height = rect.height / scale
cr.save()
cr.scale(scale, scale)
cr.translate(-clip_left, -clip_top)
cr.translate(win_width/2 - clip_width/2, win_height/2 - clip_height/2)
cr.rectangle(clip_left, clip_top, clip_width, clip_height)
cr.clip()
page.render(cr)
cr.restore()
if self.show_meta:
cr.save()
cr.select_font_face("Courier", cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)
cr.set_font_size(24)
delta = stopwatch.get_time()
text = "{:.0f}:{:02.0f}".format(delta//60, delta%60)
ext = cr.text_extents(text)
cr.move_to(rect.width - ext[2] - 10, 10 + ext[3])
if stopwatch.is_paused():
p = (int((time.time()*2) % 2 >= 1) + 1) / 3
cr.set_source_rgb(p, p, p)
else:
cr.set_source_rgb(1, 1, 1)
cr.text_path(text)
cr.clip()
cr.paint()
cr.restore()
def log_time(text):
now = datetime.now()
delta = stopwatch.get_time()
print('{:>16s} after {:.0f}:{:02.0f} (at {:%X})'.format('{} on {:<3d}'.format(text, page_idx+1), delta//60, delta%60, now))
def key_pressed(widget, ev):
key = Gdk.keyval_name(ev.keyval)
if key == 'Left' or key == 'Page_Up':
set_page(page_idx - 1)
elif key == 'Right' or key == 'space' or key == 'Page_Down':
set_page(page_idx + 1)
elif key == 's':
log_time('restarted')
print()
stopwatch.restart()
elif key == 'p':
if stopwatch.is_paused():
log_time('resumed')
stopwatch.resume()
else:
log_time('paused')
stopwatch.pause()
elif key == 'r':
log_time('reloaded')
slides_window.reload_document()
notes_window.reload_document()
elif key == 'Escape' or key == 'backslash':
if slides_window.page_idx is None:
slides_window.page_idx = page_idx
log_time('froze')
else:
slides_window.page_idx = None
log_time('unfroze')
slides_window.queue_draw()
notes_window.queue_draw()
elif key == 'q':
Gtk.main_quit()
def set_page(idx):
global page_idx
page_idx = max(0, min(slides_window.document.get_n_pages() - 1, idx))
now = datetime.now()
log_time('arrived')
slides_window.queue_draw()
notes_window.queue_draw()
import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)
stopwatch = Stopwatch()
stopwatch.restart()
print('Started at', datetime.now())
arg_parser = argparse.ArgumentParser(description='Show two PDF files in sync.')
arg_parser.add_argument('slides', metavar='SLIDES', help='PDF file to show as slides')
arg_parser.add_argument('notes', metavar='NOTES', help='PDF file to show as notes')
arg_parser.add_argument('-j', metavar='N', dest='page', type=int, default=1, help='Jump to page')
args = arg_parser.parse_args()
slides_window = PdfWindow('presentation_slides', (0, 0, 1, 1), '{} (slides)')
notes_window = PdfWindow('presentation_notes', (0, 0, 1, 1), '{} (notes)', show_meta=True)
slides_window.load_document(args.slides)
notes_window.load_document(args.notes)
set_page(args.page-1)
slides_window.show_all()
notes_window.show_all()
Gtk.main()
log_time('quit')