slider.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 gtk
  19 import gobject
  20
  21 class AdjustmentdBFS(gtk.Adjustment):
  22     def __init__(self, scale, default_db):
  23         self.default_value = scale.db_to_scale(default_db)
  24         self.db = default_db
  25         self.scale = scale
  26         gtk.Adjustment.__init__(self, self.default_value, 0.0, 1.0, 0.02)
  27         self.connect("value-changed", self.on_value_changed)
  28         self.disable_value_notify = False
  29
  30     def step_up(self):
  31         self.set_value(self.get_value() + self.step_increment)
  32
  33     def step_down(self):
  34         self.set_value(self.get_value() - self.step_increment)
  35
  36     def reset(self):
  37         self.set_value(self.default_value)
  38
  39     def get_value_db(self):
  40         return self.db
  41
  42     def set_value_db(self, db):
  43         self.db = db
  44         self.disable_value_notify = True
  45         self.set_value(self.scale.db_to_scale(db))
  46         self.disable_value_notify = False
  47         self.emit("volume-changed")
  48
  49     def on_value_changed(self, adjustment):
  50         if not self.disable_value_notify:
  51             self.db = self.scale.scale_to_db(self.get_value())
  52             self.emit("volume-changed")
  53
  54     def set_scale(self, scale):
  55         self.scale = scale
  56         self.disable_value_notify = True
  57         self.set_value(self.scale.db_to_scale(self.db))
  58         self.disable_value_notify = False
  59
  60 gobject.signal_new("volume-changed", AdjustmentdBFS,
  61                    gobject.SIGNAL_RUN_FIRST | gobject.SIGNAL_ACTION, gobject.TYPE_NONE, [])
  62
  63
  64 class GtkSlider(gtk.VScale):
  65     def __init__(self, adjustment):
  66         gtk.VScale.__init__(self, adjustment)
  67         self.set_draw_value(False)
  68         self.set_inverted(True)
  69
  70         # HACK: we want the behaviour you get with the middle button, so we
  71         # mangle the events. Clicking with other buttons moves the slider in
  72         # step increments, clicking with the middle button moves the slider
  73         # to the location of the click.
  74         self.connect('button-press-event', self.button_press_event)
  75         self.connect('button-release-event', self.button_release_event)
  76
  77     def button_press_event(self, widget, event):
  78         event.button = 2
  79         return False
  80
  81     def button_release_event(self, widget, event):
  82         event.button = 2
  83         return False
  84
  85
  86 class CustomSliderWidget(gtk.DrawingArea):
  87     def __init__(self, adjustment):
  88         gtk.DrawingArea.__init__(self)
  89
  90         self.adjustment = adjustment
  91
  92         self.connect("expose-event", self.on_expose)
  93         self.connect("size-request", self.on_size_request)
  94         self.connect("size_allocate", self.on_size_allocate)
  95         adjustment.connect("value-changed", self.on_value_changed)
  96         self.connect("button-press-event", self.on_mouse)
  97         self.connect("motion-notify-event", self.on_mouse)
  98         self.set_events(gtk.gdk.BUTTON1_MOTION_MASK | gtk.gdk.BUTTON1_MOTION_MASK | gtk.gdk.BUTTON_PRESS_MASK)
  99
 100     def on_mouse(self, widget, event):
 101         if event.type == gtk.gdk.BUTTON_PRESS:
 102             #print "mouse button %u pressed %u:%u" % (event.button, event.x, event.y)
 103             if event.button == 1:
 104                 if event.y >= self.slider_rail_up and event.y < self.slider_rail_up + self.slider_rail_height:
 105                     self.adjustment.set_value(1 - float(event.y - self.slider_rail_up)/float(self.slider_rail_height))
 106             elif event.button == 2:
 107                 self.adjustment.reset()
 108         elif event.type == gtk.gdk.MOTION_NOTIFY:
 109             #print "mouse motion %u:%u" % (event.x, event.y)
 110             if event.y < self.slider_rail_up:
 111                 y = self.slider_rail_up
 112             elif event.y > self.slider_rail_up + self.slider_rail_height:
 113                 y = self.slider_rail_up + self.slider_rail_height
 114             else:
 115                 y = event.y
 116             self.adjustment.set_value(1 - float(y - self.slider_rail_up)/float(self.slider_rail_height))
 117
 118         return False
 119
 120     def on_value_changed(self, adjustment):
 121         self.invalidate_all()
 122
 123     def on_expose(self, widget, event):
 124         cairo_ctx = widget.window.cairo_create()
 125
 126         # set a clip region for the expose event
 127         cairo_ctx.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
 128         cairo_ctx.clip()
 129
 130         self.draw(cairo_ctx)
 131
 132         return False
 133
 134     def on_size_allocate(self, widget, allocation):
 135         #print allocation.x, allocation.y, allocation.width, allocation.height
 136         self.width = float(allocation.width)
 137         self.height = float(allocation.height)
 138         self.font_size = 10
 139
 140     def on_size_request(self, widget, requisition):
 141         #print "size-request, %u x %u" % (requisition.width, requisition.height)
 142         requisition.width = 20
 143         return
 144
 145     def invalidate_all(self):
 146         self.queue_draw_area(0, 0, int(self.width), int(self.height))
 147
 148     def draw(self, cairo_ctx):
 149         if self.flags() & gtk.HAS_FOCUS:
 150             state = gtk.STATE_PRELIGHT
 151         else:
 152             state = gtk.STATE_NORMAL
 153
 154         #cairo_ctx.rectangle(0, 0, self.width, self.height)
 155         #cairo_ctx.set_source_color(self.style.bg[state])
 156         #cairo_ctx.fill_preserve()
 157         cairo_ctx.set_source_color(self.style.fg[state])
 158         #cairo_ctx.stroke()
 159
 160         slider_knob_width = self.width * 3 / 4
 161         slider_knob_height = self.width * 3 / 2
 162         slider_knob_height -= slider_knob_height % 2
 163         slider_knob_height += 1
 164
 165         slider_x = self.width/2
 166
 167         cairo_ctx.set_line_width(1)
 168
 169         # slider rail
 170         cairo_ctx.set_source_color(self.style.dark[state])
 171         self.slider_rail_up = slider_knob_height/2 + (self.width - slider_knob_width)/2
 172         self.slider_rail_height = self.height - 2 * self.slider_rail_up
 173         cairo_ctx.move_to(slider_x, self.slider_rail_up)
 174         cairo_ctx.line_to(slider_x, self.slider_rail_height + self.slider_rail_up)
 175         cairo_ctx.stroke()
 176
 177         # slider knob
 178         slider_y = round(self.slider_rail_up + self.slider_rail_height * (1 - self.adjustment.get_value()))
 179         cairo_ctx.rectangle(slider_x - float(slider_knob_width)/2,
 180                             slider_y - slider_knob_height/2,
 181                             float(slider_knob_width),
 182                             slider_knob_height)
 183         cairo_ctx.set_source_color(self.style.bg[state])
 184         cairo_ctx.fill_preserve()
 185         cairo_ctx.set_source_color(self.style.fg[state])
 186         cairo_ctx.stroke()
 187         # slider knob marks
 188         cairo_ctx.set_source_color(self.style.fg[state])
 189         for i in range(int(slider_knob_height/2))[8:]:
 190             if i % 2 == 0:
 191                 correction = 1.0 + (float(slider_knob_height)/2.0 - float(i)) / 10.0
 192                 correction *= 2
 193                 y = slider_y - i
 194                 w = float(slider_knob_width)/2.0 - correction
 195                 x1 = slider_x - w
 196                 x2 = slider_x + w
 197                 cairo_ctx.move_to(x1, y+0.5)
 198                 cairo_ctx.line_to(x2, y+0.5)
 199                 y = slider_y + i
 200                 cairo_ctx.move_to(x1, y-0.5)
 201                 cairo_ctx.line_to(x2, y-0.5)
 202         cairo_ctx.set_line_width(1)
 203         cairo_ctx.stroke()
 204         # slider knob middle mark
 205         cairo_ctx.move_to(slider_x - float(slider_knob_width)/2, slider_y)
 206         cairo_ctx.line_to(slider_x + float(slider_knob_width)/2, slider_y)
 207         cairo_ctx.set_line_width(2)
 208         cairo_ctx.stroke()