#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2015 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 Qt, QtCore, QtGui
import util
class Range(object):
def __init__(self, minv, maxv, step, default, min_length):
self.min = float(minv)
self.max = float(maxv)
self.step = float(step)
self.default = float(default)
self.min_length = min_length
self.find_precision()
self.find_nsteps()
util.check_set_qss()
def find_precision(self):
# Get the decimal part of the step
temp = str(float(self.step) - int(self.step))[2:]
precision = len(temp) if temp is not '0' else 0
precision = min(precision, 13)
if precision == 0 and self.max < 100:
self.precision = 1 # Always have a decimal in this case
else:
self.precision = (precision + 2) if precision > 0 else 0
def find_nsteps(self):
self.nsteps = (self.max + self.step - self.min)/self.step
def demap_range(self, val):
if val > self.max:
val = self.max
if val < self.min:
val = self.min
return ((val-self.min)/self.step)
def map_range(self, val):
if val > self.nsteps:
val = self.max
if val < 0:
val = 0
return (val*self.step+self.min)
class RangeWidget(QtGui.QWidget):
def __init__(self, ranges, slot, label, style, rangeType=float):
""" Creates the QT Range widget """
QtGui.QWidget.__init__(self)
self.range = ranges
self.style = style
# rangeType tells the block how to return the value as a standard
self.rangeType = rangeType
# Top-block function to call when any value changes
# Some widgets call this directly when their value changes.
# Others have intermediate functions to map the value into the right range.
self.notifyChanged = slot
layout = Qt.QHBoxLayout()
label = Qt.QLabel(label)
layout.addWidget(label)
if style == "dial":
self.d_widget = self.Dial(self, self.range, self.notifyChanged, rangeType)
elif style == "slider":
self.d_widget = self.Slider(self, self.range, self.notifyChanged, rangeType)
elif style == "counter":
# The counter widget can be directly wired to the notifyChanged slot
self.d_widget = self.Counter(self, self.range, self.notifyChanged, rangeType)
else:
# The CounterSlider needs its own internal handlers before calling notifyChanged
self.d_widget = self.CounterSlider(self, self.range, self.notifyChanged, rangeType)
layout.addWidget(self.d_widget)
self.setLayout(layout)
class Dial(QtGui.QDial):
""" Creates the range using a dial """
def __init__(self, parent, ranges, slot, rangeType=float):
QtGui.QDial.__init__(self, parent)
self.rangeType = rangeType
# Setup the dial
self.setRange(0, ranges.nsteps-1)
self.setSingleStep(1)
self.setNotchesVisible(True)
self.range = ranges
# Round the initial value to the closest tick
temp = int(round(ranges.demap_range(ranges.default), 0))
self.setValue(temp)
# Setup the slots
self.valueChanged.connect(self.changed)
self.notifyChanged = slot
def changed(self, value):
""" Handles maping the value to the right range before calling the slot. """
val = self.range.map_range(value)
self.notifyChanged(self.rangeType(val))
class Slider(QtGui.QSlider):
""" Creates the range using a slider """
def __init__(self, parent, ranges, slot, rangeType=float):
QtGui.QSlider.__init__(self, QtCore.Qt.Horizontal, parent)
self.rangeType = rangeType
# Setup the slider
#self.setFocusPolicy(QtCore.Qt.NoFocus)
self.setRange(0, ranges.nsteps - 1)
self.setTickPosition(2)
self.setSingleStep(1)
self.range = ranges
# Round the initial value to the closest tick
temp = int(round(ranges.demap_range(ranges.default), 0))
self.setValue(temp)
if ranges.nsteps > ranges.min_length:
interval = int(ranges.nsteps/ranges.min_length)
self.setTickInterval(interval)
self.setPageStep(interval)
else:
self.setTickInterval(1)
self.setPageStep(1)
# Setup the handler function
self.valueChanged.connect(self.changed)
self.notifyChanged = slot
def changed(self, value):
""" Handle the valueChanged signal and map the value into the correct range """
val = self.range.map_range(value)
self.notifyChanged(self.rangeType(val))
def mousePressEvent(self, event):
if((event.button() == QtCore.Qt.LeftButton)):
new = self.minimum() + ((self.maximum()-self.minimum()) * event.x()) / self.width()
self.setValue(new)
event.accept()
# Use repaint rather than calling the super mousePressEvent.
# Calling super causes issue where slider jumps to wrong value.
QtGui.QSlider.repaint(self)
def mouseMoveEvent(self, event):
new = self.minimum() + ((self.maximum()-self.minimum()) * event.x()) / self.width()
self.setValue(new)
event.accept()
QtGui.QSlider.repaint(self)
class Counter(QtGui.QDoubleSpinBox):
""" Creates the range using a counter """
def __init__(self, parent, ranges, slot, rangeType=float):
QtGui.QDoubleSpinBox.__init__(self, parent)
self.rangeType = rangeType
# Setup the counter
self.setRange(ranges.min, ranges.max)
self.setValue(ranges.default)
self.setSingleStep(ranges.step)
self.setKeyboardTracking(False)
self.setDecimals(ranges.precision)
# The counter already handles floats and can be connected directly.
self.valueChanged.connect(self.changed)
self.notifyChanged = slot
def changed(self, value):
""" Handle the valueChanged signal by converting to the right type """
self.notifyChanged(self.rangeType(value))
class CounterSlider(QtGui.QWidget):
""" Creates the range using a counter and slider """
def __init__(self, parent, ranges, slot, rangeType=float):
QtGui.QWidget.__init__(self, parent)
self.rangeType = rangeType
# Slot to call in the parent
self.notifyChanged = slot
self.slider = RangeWidget.Slider(parent, ranges, self.sliderChanged, rangeType)
self.counter = RangeWidget.Counter(parent, ranges, self.counterChanged, rangeType)
# Need another horizontal layout to wrap the other widgets.
layout = Qt.QHBoxLayout()
layout.addWidget(self.slider)
layout.addWidget(self.counter)
self.setLayout(layout)
# Flag to ignore the slider event caused by a change to the counter.
self.ignoreSlider = False
self.range = ranges
def sliderChanged(self, value):
""" Handles changing the counter when the slider is updated """
# If the counter was changed, ignore any of these events
if not self.ignoreSlider:
# Value is already float. Just set the counter
self.counter.setValue(self.rangeType(value))
self.notifyChanged(self.rangeType(value))
self.ignoreSlider = False
def counterChanged(self, value):
""" Handles changing the slider when the counter is updated """
# Get the current slider value and check to see if the new value changes it
current = self.slider.value()
new = int(round(self.range.demap_range(value), 0))
# If it needs to change, ignore the slider event
# Otherwise, the slider will cause the counter to round to the nearest tick
if current != new:
self.ignoreSlider = True
self.slider.setValue(new)
self.notifyChanged(self.rangeType(value))
if __name__ == "__main__":
from PyQt4 import Qt
import sys
def valueChanged(frequency):
print("Value updated - " + str(frequency))
app = Qt.QApplication(sys.argv)
widget = RangeWidget(Range(0, 100, 10, 1, 100), valueChanged, "Test", "counter_slider", int)
widget.show()
widget.setWindowTitle("Test Qt Range")
app.exec_()
widget = None