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, from_midi = False):
  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         if not from_midi:
  51             self.emit("volume-changed")
  52         else:
  53             self.emit("volume-changed-from-midi")
  54
  55     def on_value_changed(self, adjustment):
  56         if not self.disable_value_notify:
  57             self.db = self.scale.scale_to_db(self.get_value())
  58             self.emit("volume-changed")
  59
  60     def set_scale(self, scale):
  61         self.scale = scale
  62         self.disable_value_notify = True
  63         self.set_value(self.scale.db_to_scale(self.db))
  64         self.disable_value_notify = False
  65
  66 GObject.signal_new("volume-changed", AdjustmentdBFS,
  67                    GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None, [])
  68
  69 GObject.signal_new("volume-changed-from-midi", AdjustmentdBFS,
  70                    GObject.SignalFlags.RUN_FIRST | GObject.SignalFlags.ACTION, None, [])
  71
  72
  73 class GtkSlider(Gtk.VScale):
  74     def __init__(self, adjustment):
  75         Gtk.VScale.__init__(self)#, adjustment)
  76         self.adjustment = adjustment
  77         self.set_adjustment(adjustment)
  78         self.set_draw_value(False)
  79         self.set_inverted(True)
  80         self.button_down = False
  81         self.button_down_y = 0
  82         self.button_down_value = 0
  83
  84         # HACK: we want the behaviour you get with the middle button, so we
  85         # mangle the events. Clicking with other buttons moves the slider in
  86         # step increments, clicking with the middle button moves the slider
  87         # to the location of the click.
  88         self.connect('button-press-event', self.button_press_event)
  89         self.connect('button-release-event', self.button_release_event)
  90         self.connect('button-release-event', self.button_release_event)
  91         self.connect("motion-notify-event", self.motion_notify_event)
  92         self.connect("scroll-event", self.scroll_event)
  93
  94     def button_press_event(self, widget, event):
  95         if event.type == Gdk.EventType.BUTTON_PRESS:
  96             widget.get_style_context().set_state(Gtk.StateFlags.FOCUSED)
  97             widget.get_style_context().set_state(Gtk.StateFlags.PRELIGHT|Gtk.StateFlags.FOCUSED)
  98             widget.get_style_context().add_class('dragging')
  99             widget.get_style_context().add_class(':focused')
 100             self.button_down = True
 101             self.button_down_y = event.y
 102             self.button_down_value = self.adjustment.get_value()
 103             return True
 104         if not event.state & Gdk.ModifierType.CONTROL_MASK and event.button == 1 and event.type == Gdk.EventType._2BUTTON_PRESS:
 105             self.adjustment.set_value(0)
 106             return True
 107         if event.state & Gdk.ModifierType.CONTROL_MASK and event.button == 1 and event.type == Gdk.EventType._2BUTTON_PRESS:
 108             self.adjustment.set_value(self.adjustment.scale.db_to_scale(1))
 109             return True
 110         return False
 111
 112     def button_release_event(self, widget, event):
 113         self.button_down = False
 114         return False
 115
 116     def motion_notify_event(self, widget, event):
 117         slider_length = widget.get_allocation().height - widget.get_style_context().get_property('min-height', Gtk.StateFlags.NORMAL)
 118         if self.button_down:
 119             delta_y = (self.button_down_y - event.y) / slider_length
 120             y = self.button_down_value + delta_y
 121             if y >= 1:
 122                 y = 1
 123             elif y <= 0:
 124                 y = 0
 125             self.adjustment.set_value(y)
 126             return True
 127
 128     def scroll_event(self, widget, event):
 129         delta = self.adjustment.step_increment
 130         value = self.adjustment.get_value()
 131         if event.direction == Gdk.ScrollDirection.UP:
 132             y = value + delta
 133         elif event.direction == Gdk.ScrollDirection.DOWN:
 134             y = value - delta
 135         elif event.direction == Gdk.ScrollDirection.SMOOTH:
 136             y = value - event.delta_y * delta
 137
 138         if y >= 1:
 139             y = 1
 140         elif y <= 0:
 141             y = 0
 142         self.adjustment.set_value(y)
 143         return True
 144
 145 class CustomSliderWidget(Gtk.DrawingArea):
 146     def __init__(self, adjustment):
 147         Gtk.DrawingArea.__init__(self)
 148
 149         self.adjustment = adjustment
 150
 151         self.connect("draw", self.on_expose)
 152         self.connect("size_allocate", self.on_size_allocate)
 153         adjustment.connect("value-changed", self.on_value_changed)
 154         self.connect("button-press-event", self.on_mouse)
 155         self.connect("motion-notify-event", self.on_mouse)
 156         self.connect("scroll-event", self.on_scroll)
 157         self.set_events(Gdk.EventMask.BUTTON1_MOTION_MASK |
 158                 Gdk.EventMask.SCROLL_MASK | Gdk.EventMask.BUTTON_PRESS_MASK)
 159
 160     def on_scroll(self, widget, event):
 161         delta = self.adjustment.step_increment
 162         value = self.adjustment.get_value()
 163         if event.direction == Gdk.ScrollDirection.UP:
 164             y = value + delta
 165         elif event.direction == Gdk.ScrollDirection.DOWN:
 166             y = value - delta
 167         if y >= 1:
 168             y = 1
 169         elif y <= 0:
 170             y = 0
 171         self.adjustment.set_value(y)
 172         return True
 173
 174     def on_mouse(self, widget, event):
 175         if event.type == Gdk.EventType.BUTTON_PRESS:
 176             #print "mouse button %u pressed %u:%u" % (event.button, event.x, event.y)
 177             if event.button == 1:
 178                 if event.y >= self.slider_rail_up and event.y < self.slider_rail_up + self.slider_rail_height:
 179                     self.adjustment.set_value(1 - float(event.y - self.slider_rail_up)/float(self.slider_rail_height))
 180         elif event.type == Gdk.EventType.MOTION_NOTIFY:
 181             #print "mouse motion %u:%u" % (event.x, event.y)
 182             if event.y < self.slider_rail_up:
 183                 y = self.slider_rail_up
 184             elif event.y > self.slider_rail_up + self.slider_rail_height:
 185                 y = self.slider_rail_up + self.slider_rail_height
 186             else:
 187                 y = event.y
 188             self.adjustment.set_value(1 - float(y - self.slider_rail_up)/float(self.slider_rail_height))
 189
 190         return False
 191
 192     def on_value_changed(self, adjustment):
 193         self.invalidate_all()
 194
 195     def on_expose(self, widget, cairo_ctx):
 196
 197         self.draw(cairo_ctx)
 198
 199         return False
 200
 201     def get_preferred_width(self, widget):
 202         minimal_width = natural_width = self.width
 203         return (minimal_width, natural_width)
 204
 205     def get_preferred_height(self, widget):
 206         requisition = Gtk.Requisition()
 207         on_size_request(self, widget, requisition)
 208         minimal_height = natural_heigt = requisition.height
 209         return (minimal_height, natural_height)
 210
 211
 212     def on_size_allocate(self, widget, allocation):
 213         self.width = float(allocation.width)
 214         self.height = float(allocation.height)
 215         self.font_size = 10
 216
 217     def on_size_request(self, widget, requisition):
 218         requisition.width = 20
 219         return
 220
 221     def invalidate_all(self):
 222         if hasattr(self, 'width') and hasattr(self, 'height'):
 223             self.queue_draw_area(0, 0, int(self.width), int(self.height))
 224
 225     def draw(self, cairo_ctx):
 226         if self.has_focus():
 227             state = Gtk.StateType.PRELIGHT
 228         else:
 229             state = Gtk.StateType.NORMAL
 230
 231         #cairo_ctx.rectangle(0, 0, self.width, self.height)
 232         #cairo_ctx.set_source_color(self.style.bg[state])
 233         #cairo_ctx.fill_preserve()
 234         #Gdk.cairo_set_source_color(cairo_ctx,
 235         #        self.get_style_context().get_color(state).to_color())
 236         #cairo_ctx.stroke()
 237
 238         slider_knob_width = 37.5 if self.width * 3 / 4 > 37.5 else self.width * 3 / 4
 239         slider_knob_height = slider_knob_width * 2
 240         slider_knob_height -= slider_knob_height % 2
 241         slider_knob_height += 1
 242
 243         slider_x = self.width/2
 244
 245         cairo_ctx.set_line_width(1)
 246
 247         # slider rail
 248         Gdk.cairo_set_source_color(cairo_ctx,
 249                 self.get_style_context().get_color(state).to_color())
 250         self.slider_rail_up = slider_knob_height/2 + (self.width - slider_knob_width)/2
 251         self.slider_rail_height = self.height - 2 * self.slider_rail_up
 252         cairo_ctx.move_to(slider_x, self.slider_rail_up)
 253         cairo_ctx.line_to(slider_x, self.slider_rail_height + self.slider_rail_up)
 254         cairo_ctx.stroke()
 255
 256         # slider knob
 257         slider_y = round(self.slider_rail_up + self.slider_rail_height * (1 - self.adjustment.get_value()))
 258         lg = cairo.LinearGradient(slider_x -
 259                 float(slider_knob_width)/2, slider_y - slider_knob_height/2,
 260                 slider_x - float(slider_knob_width)/2, slider_y +
 261                 slider_knob_height/2)
 262         slider_alpha = 1.0
 263         lg.add_color_stop_rgba(0, 0.55, 0.55, 0.55, slider_alpha)
 264         lg.add_color_stop_rgba(0.1, 0.65, 0.65, 0.65, slider_alpha)
 265         lg.add_color_stop_rgba(0.1, 0.75, 0.75, 0.75, slider_alpha)
 266         lg.add_color_stop_rgba(0.125, 0.75, 0.75, 0.75, slider_alpha)
 267         lg.add_color_stop_rgba(0.125, 0.15, 0.15, 0.15, slider_alpha)
 268         lg.add_color_stop_rgba(0.475, 0.35, 0.35, 0.35, slider_alpha)
 269         lg.add_color_stop_rgba(0.475, 0, 0, 0, slider_alpha)
 270         lg.add_color_stop_rgba(0.525, 0, 0, 0, slider_alpha)
 271         lg.add_color_stop_rgba(0.525, 0.35, 0.35, 0.35, slider_alpha)
 272         lg.add_color_stop_rgba(0.875, 0.65, 0.65, 0.65, slider_alpha)
 273         lg.add_color_stop_rgba(0.875, 0.75, 0.75, 0.75, slider_alpha)
 274         lg.add_color_stop_rgba(0.900, 0.75, 0.75, 0.75, slider_alpha)
 275         lg.add_color_stop_rgba(0.900, 0.15, 0.15, 0.15, slider_alpha)
 276         lg.add_color_stop_rgba(1.000, 0.10, 0.10, 0.10, slider_alpha)
 277         cairo_ctx.rectangle(slider_x - float(slider_knob_width)/2,
 278                             slider_y - slider_knob_height/2,
 279                             float(slider_knob_width),
 280                             slider_knob_height)
 281         Gdk.cairo_set_source_color(cairo_ctx,
 282                 self.get_style_context().get_background_color(state).to_color())
 283         cairo_ctx.fill_preserve()
 284         cairo_ctx.set_source(lg)
 285         cairo_ctx.fill()