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 class AbspeakWidget(Gtk.EventBox):
  26     def __init__(self):
  27         super().__init__()
  28         self.label = Gtk.Label()
  29         self.add(self.label)
  30         self.connect("button-press-event", self.on_mouse)
  31         self.peak = -math.inf
  32
  33     def get_style_context(self):
  34         return self.label.get_style_context()
  35
  36     def on_mouse(self, widget, event):
  37         if event.type == Gdk.EventType.BUTTON_PRESS:
  38             if event.button == 1 or event.button == 2 or event.button == 3:
  39                 context = self.get_style_context()
  40                 context.remove_class("over_zero")
  41                 context.remove_class("is_nan")
  42
  43             if event.button == 1 or event.button == 3:
  44                 self.emit("reset")
  45             elif event.button == 2:
  46                 adjust = -self.peak
  47
  48                 if abs(adjust) < 30:  # we better don't adjust more than +- 30 dB
  49                     self.emit("volume-adjust", adjust)
  50
  51     def set_peak(self, peak):
  52         self.peak = peak
  53         context = self.get_style_context()
  54
  55         if math.isnan(peak):
  56             context.remove_class("over_zero")
  57             context.add_class("is_nan")
  58             self.label.set_text("NaN")
  59         else:
  60             text = "%+.1f" % peak
  61             context.remove_class("is_nan")
  62
  63             if peak > 0:
  64                 context.add_class("over_zero")
  65
  66             self.label.set_text(text)
  67
  68
  69 GObject.signal_new(
  70     "reset", AbspeakWidget, GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None, []
  71 )
  72 GObject.signal_new(
  73     "volume-adjust",
  74     AbspeakWidget,
  75     GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION,
  76     None,
  77     [GObject.TYPE_FLOAT],
  78 )