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#
# Copyright 2010 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from PyQt4 import QtGui
from PyQt4 import QtCore
import converters
class _form_base(QtGui.QWidget):
def __init__(self, parent=None, converter=None, callback=None, value=None):
QtGui.QWidget.__init__(self, parent)
self._converter = converter
self._callback = callback
self.set_value(value)
def get_value(self):
return self._value
def set_value(self, value):
self._value = value
self._base_update(self._converter.external_to_internal(value))
def _base_update(self, int_val):
self._update(int_val)
def _base_handle(self, int_val):
self._value = self._converter.internal_to_external(int_val)
if self._callback: self._callback(self._value)
class _slider_base(_form_base):
def __init__(self, label='', length=-1, num_steps=100, orient=QtCore.Qt.Horizontal, **kwargs):
_form_base.__init__(self, **kwargs)
self._slider = QtGui.QSlider(parent=self)
self._slider.setOrientation(orient)
self._slider.setRange(0, num_steps)
if length > 0:
if orient == QtCore.Qt.Horizontal:
slider_size = self._slider.setWidth(length)
if orient == QtCore.Qt.Vertical:
slider_size = self._slider.setHeight(length)
self.slider.valueChanged.connect(self._handle)
def _handle(self, event): self._base_handle(self._slider.value())
def _update(self, value): self._slider.setValue(int(round(value)))
class slider(_slider_base):
"""
A generic linear slider.
@param parent the parent widget
@param value the default value
@param label title label for this widget (optional)
@param length the length of the slider in px (optional)
@param orient Qt.Horizontal Veritcal (default=horizontal)
@param start the start value
@param stop the stop value
@param num_steps the number of slider steps (or specify step_size)
@param step_size the step between slider jumps (or specify num_steps)
@param cast a cast function, int, or float (default=float)
"""
def __init__(self, start, stop, num_steps=100, step_size=None, cast=float, **kwargs):
assert step_size or num_steps
if step_size is not None: num_steps = (stop - start)/step_size
converter = converters.slider_converter(start=start, stop=stop, num_steps=num_steps, cast=cast)
_slider_base.__init__(self, converter=converter, num_steps=num_steps, **kwargs)
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