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 from gi.repository import Gtk
  19 from gi.repository import Gdk
  20 from gi.repository import GObject
  21 import cairo
  22
  23 class AdjustmentdBFS(Gtk.Adjustment):
  24     def __init__(self, scale, default_db, step_inc):
  25         self.default_value = scale.db_to_scale(default_db)
  26         self.db = default_db
  27         self.scale = scale
  28         self.step_increment = step_inc
  29         Gtk.Adjustment.__init__(self, self.default_value, 0.0, 1.0, 0.02)
  30         self.connect("value-changed", self.on_value_changed)
  31         self.disable_value_notify = False
  32
  33     def step_up(self):
  34         self.set_value(self.get_value() + self.step_increment)
  35
  36     def step_down(self):
  37         self.set_value(self.get_value() - self.step_increment)
  38
  39     def reset(self):
  40         self.set_value(self.default_value)
  41
  42     def get_value_db(self):
  43         return self.db
  44
  45     def set_value_db(self, db):
  46         self.db = db
  47         self.disable_value_notify = True
  48         self.set_value(self.scale.db_to_scale(db))
  49         self.disable_value_notify = False
  50         self.emit("volume-changed")
  51
  52     def on_value_changed(self, adjustment):
  53         if not self.disable_value_notify:
  54             self.db = self.scale.scale_to_db(self.get_value())
  55             self.emit("volume-changed")
  56
  57     def set_scale(self, scale):
  58         self.scale = scale
  59         self.disable_value_notify = True
  60         self.set_value(self.scale.db_to_scale(self.db))
  61         self.disable_value_notify = False
  62
  63 GObject.signal_new("volume-changed", AdjustmentdBFS,
  64                    GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None, [])
  65
  66
  67 class GtkSlider(Gtk.VScale):
  68     def __init__(self, adjustment):
  69         Gtk.VScale.__init__(self)#, adjustment)
  70         self.set_adjustment(adjustment)
  71         self.set_draw_value(False)
  72         self.set_inverted(True)
  73
  74         # HACK: we want the behaviour you get with the middle button, so we
  75         # mangle the events. Clicking with other buttons moves the slider in
  76         # step increments, clicking with the middle button moves the slider
  77         # to the location of the click.
  78         self.connect('button-press-event', self.button_press_event)
  79         self.connect('button-release-event', self.button_release_event)
  80
  81     def button_press_event(self, widget, event):
  82         print("button press", event.button)
  83        # event.button = 2
  84         return False
  85
  86     def button_release_event(self, widget, event):
  87         #event.button = 2
  88         return False
  89
  90
  91 class CustomSliderWidget(Gtk.DrawingArea):
  92     def __init__(self, adjustment):
  93         Gtk.DrawingArea.__init__(self)
  94
  95         self.adjustment = adjustment
  96
  97         self.connect("draw", self.on_expose)
  98         self.connect("size_allocate", self.on_size_allocate)
  99         adjustment.connect("value-changed", self.on_value_changed)
 100         self.connect("button-press-event", self.on_mouse)
 101         self.connect("motion-notify-event", self.on_mouse)
 102         self.connect("scroll-event", self.on_scroll)
 103         self.set_events(Gdk.EventMask.BUTTON1_MOTION_MASK |
 104                 Gdk.EventMask.SCROLL_MASK | Gdk.EventMask.BUTTON_PRESS_MASK)
 105
 106     def on_scroll(self, widget, event):
 107         delta = self.adjustment.step_increment
 108         value = self.adjustment.get_value()
 109         if event.direction == Gdk.ScrollDirection.UP:
 110             y = value + delta
 111         elif event.direction == Gdk.ScrollDirection.DOWN:
 112             y = value - delta
 113         if y >= 1:
 114             y = 1
 115         elif y <= 0:
 116             y = 0
 117         self.adjustment.set_value(y)
 118         return True
 119
 120     def on_mouse(self, widget, event):
 121         if event.type == Gdk.EventType.BUTTON_PRESS:
 122             #print "mouse button %u pressed %u:%u" % (event.button, event.x, event.y)
 123             if event.button == 1:
 124                 if event.y >= self.slider_rail_up and event.y < self.slider_rail_up + self.slider_rail_height:
 125                     self.adjustment.set_value(1 - float(event.y - self.slider_rail_up)/float(self.slider_rail_height))
 126         elif event.type == Gdk.EventType.MOTION_NOTIFY:
 127             #print "mouse motion %u:%u" % (event.x, event.y)
 128             if event.y < self.slider_rail_up:
 129                 y = self.slider_rail_up
 130             elif event.y > self.slider_rail_up + self.slider_rail_height:
 131                 y = self.slider_rail_up + self.slider_rail_height
 132             else:
 133                 y = event.y
 134             self.adjustment.set_value(1 - float(y - self.slider_rail_up)/float(self.slider_rail_height))
 135
 136         return False
 137
 138     def on_value_changed(self, adjustment):
 139         self.invalidate_all()
 140
 141     def on_expose(self, widget, cairo_ctx):
 142
 143         self.draw(cairo_ctx)
 144
 145         return False
 146
 147     def get_preferred_width(self, widget):
 148         minimal_width = natural_width = self.width
 149         return (minimal_width, natural_width)
 150
 151     def get_preferred_height(self, widget):
 152         requisition = Gtk.Requisition()
 153         on_size_request(self, widget, requisition)
 154         minimal_height = natural_heigt = requisition.height
 155         return (minimal_height, natural_height)
 156
 157
 158     def on_size_allocate(self, widget, allocation):
 159         self.width = float(allocation.width)
 160         self.height = float(allocation.height)
 161         self.font_size = 10
 162
 163     def on_size_request(self, widget, requisition):
 164         #print "size-request, %u x %u" % (requisition.width, requisition.height)
 165         requisition.width = 20
 166         return
 167
 168     def invalidate_all(self):
 169         self.queue_draw_area(0, 0, int(self.width), int(self.height))
 170
 171     def draw(self, cairo_ctx):
 172         if self.has_focus():
 173             state = Gtk.StateType.PRELIGHT
 174         else:
 175             state = Gtk.StateType.NORMAL
 176
 177         #cairo_ctx.rectangle(0, 0, self.width, self.height)
 178         #cairo_ctx.set_source_color(self.style.bg[state])
 179         #cairo_ctx.fill_preserve()
 180         #Gdk.cairo_set_source_color(cairo_ctx,
 181         #        self.get_style_context().get_color(state).to_color())
 182         #cairo_ctx.stroke()
 183
 184         slider_knob_width = self.width * 3 / 4
 185         slider_knob_height = self.width * 3 / 2
 186         slider_knob_height -= slider_knob_height % 2
 187         slider_knob_height += 1
 188
 189         slider_x = self.width/2
 190
 191         cairo_ctx.set_line_width(1)
 192
 193         # slider rail
 194         Gdk.cairo_set_source_color(cairo_ctx,
 195                 self.get_style_context().get_color(state).to_color())
 196         self.slider_rail_up = slider_knob_height/2 + (self.width - slider_knob_width)/2
 197         self.slider_rail_height = self.height - 2 * self.slider_rail_up
 198         cairo_ctx.move_to(slider_x, self.slider_rail_up)
 199         cairo_ctx.line_to(slider_x, self.slider_rail_height + self.slider_rail_up)
 200         cairo_ctx.stroke()
 201
 202         # slider knob
 203         slider_y = round(self.slider_rail_up + self.slider_rail_height * (1 - self.adjustment.get_value()))
 204         lg = cairo.LinearGradient(slider_x -
 205                 float(slider_knob_width)/2, slider_y - slider_knob_height/2,
 206                 slider_x - float(slider_knob_width)/2, slider_y +
 207                 slider_knob_height/2)
 208         slider_alpha = 1.0
 209         lg.add_color_stop_rgba(0, 0.55, 0.55, 0.55, slider_alpha)
 210         lg.add_color_stop_rgba(0.1, 0.65, 0.65, 0.65, slider_alpha)
 211         lg.add_color_stop_rgba(0.1, 0.75, 0.75, 0.75, slider_alpha)
 212         lg.add_color_stop_rgba(0.125, 0.75, 0.75, 0.75, slider_alpha)
 213         lg.add_color_stop_rgba(0.125, 0.15, 0.15, 0.15, slider_alpha)
 214         lg.add_color_stop_rgba(0.475, 0.35, 0.35, 0.35, slider_alpha)
 215         lg.add_color_stop_rgba(0.475, 0, 0, 0, slider_alpha)
 216         lg.add_color_stop_rgba(0.525, 0, 0, 0, slider_alpha)
 217         lg.add_color_stop_rgba(0.525, 0.35, 0.35, 0.35, slider_alpha)
 218         lg.add_color_stop_rgba(0.875, 0.65, 0.65, 0.65, slider_alpha)
 219         lg.add_color_stop_rgba(0.875, 0.75, 0.75, 0.75, slider_alpha)
 220         lg.add_color_stop_rgba(0.900, 0.75, 0.75, 0.75, slider_alpha)
 221         lg.add_color_stop_rgba(0.900, 0.15, 0.15, 0.15, slider_alpha)
 222         lg.add_color_stop_rgba(1.000, 0.10, 0.10, 0.10, slider_alpha)
 223         cairo_ctx.rectangle(slider_x - float(slider_knob_width)/2,
 224                             slider_y - slider_knob_height/2,
 225                             float(slider_knob_width),
 226                             slider_knob_height)
 227         Gdk.cairo_set_source_color(cairo_ctx,
 228                 self.get_style_context().get_background_color(state).to_color())
 229         cairo_ctx.fill_preserve()
 230         cairo_ctx.set_source(lg)
 231         cairo_ctx.fill()