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 import math
  19
  20 from gi.repository import Gtk
  21 from gi.repository import Gdk
  22 from gi.repository import GObject
  23
  24
  25 CSS = b"""
  26 .over_zero {
  27     background-color: #cc4c00;
  28 }
  29
  30 .is_nan {
  31     background-color: #b20000;
  32 }
  33 """
  34 css_provider = Gtk.CssProvider()
  35 css_provider.load_from_data(CSS)
  36 context = Gtk.StyleContext()
  37 screen = Gdk.Screen.get_default()
  38 context.add_provider_for_screen(screen, css_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
  39
  40
  41 class AbspeakWidget(Gtk.EventBox):
  42     def __init__(self):
  43         super().__init__()
  44         self.label = Gtk.Label()
  45         self.add(self.label)
  46         self.connect("button-press-event", self.on_mouse)
  47         self.peak = -math.inf
  48
  49     def get_style_context(self):
  50         return self.label.get_style_context()
  51
  52     def on_mouse(self, widget, event):
  53         if event.type == Gdk.EventType.BUTTON_PRESS:
  54             if event.button == 1 or event.button == 2 or event.button == 3:
  55                 context = self.get_style_context()
  56                 context.remove_class('over_zero')
  57                 context.remove_class('is_nan')
  58
  59             if event.button == 1 or event.button == 3:
  60                 self.emit("reset")
  61             elif event.button == 2:
  62                 adjust = -self.peak
  63
  64                 if abs(adjust) < 30:    # we better don't adjust more than +- 30 dB
  65                     self.emit("volume-adjust", adjust)
  66
  67     def set_peak(self, peak):
  68         self.peak = peak
  69         context = self.get_style_context()
  70
  71         if math.isnan(peak):
  72             context.remove_class('over_zero')
  73             context.add_class('is_nan')
  74             self.label.set_text("NaN")
  75         else:
  76             text = "%+.1f" % peak
  77             context.remove_class('is_nan')
  78
  79             if peak > 0:
  80                 context.add_class('over_zero')
  81
  82             self.label.set_text(text)
  83
  84
  85 GObject.signal_new("reset", AbspeakWidget,
  86                    GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None, [])
  87 GObject.signal_new("volume-adjust", AbspeakWidget,
  88                    GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None,
  89                    [GObject.TYPE_FLOAT])