abspeak.py

   1 # This file is part of jack_mixer
   2 #
   3 # Copyright (C) 2006 Nedko Arnaudov <nedko@arnaudov.name>
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; version 2 of the License
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17
  18 from gi.repository import Gtk
  19 from gi.repository import Gdk
  20 from gi.repository import Pango
  21 from gi.repository import GObject
  22 import math
  23
  24 css = b"""
  25 .over_zero {
  26     background-color: #cc4c00;
  27 }
  28
  29 .is_nan {
  30     background-color: #b20000;
  31 }
  32 """
  33 css_provider = Gtk.CssProvider()
  34 css_provider.load_from_data(css)
  35 context = Gtk.StyleContext()
  36 screen = Gdk.Screen.get_default()
  37 context.add_provider_for_screen(screen, css_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
  38
  39 class AbspeakWidget(Gtk.EventBox):
  40     def __init__(self):
  41         GObject.GObject.__init__(self)
  42         self.label = Gtk.Label()
  43         #attrs = Pango.AttrList()
  44         #font_attr =  Pango.AttrFamily("monospace")
  45         #attrs.insert(font_attr)
  46         #self.label.set_attributes(attrs)
  47         self.add(self.label)
  48         self.connect("button-press-event", self.on_mouse)
  49         self.peak = -math.inf
  50
  51     def on_mouse(self, widget, event):
  52         if event.type == Gdk.EventType.BUTTON_PRESS:
  53             if event.button == 1 or event.button == 2 or event.button == 3:
  54                 context = self.get_style_context()
  55                 context.remove_class('over_zero')
  56                 context.remove_class('is_nan')
  57             if event.button == 1 or event.button == 3:
  58                 self.emit("reset")
  59             elif event.button == 2:
  60                 adjust = -self.peak
  61                 if abs(adjust) < 30:    # we better don't adjust more than +- 30 dB
  62                     self.emit("volume-adjust", adjust)
  63
  64     def set_peak(self, peak):
  65         self.peak = peak
  66         if math.isnan(peak):
  67             self.get_style_context().add_class('is_nan')
  68             self.label.set_text("NaN")
  69         else:
  70             text = "%+.1f" % peak
  71
  72             if peak > 0:
  73                 self.get_style_context().add_class('over_zero')
  74             else:
  75                 pass
  76
  77             self.label.set_text(text)
  78
  79 GObject.signal_new("reset", AbspeakWidget,
  80                    GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None, [])
  81 GObject.signal_new("volume-adjust", AbspeakWidget,
  82                    GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None, [GObject.TYPE_FLOAT])