- # nothing found, create a new item
- desc = '{} {}, channel "{}"'.format(
- device.vendor, device.model, channel.name)
-
- item = QtGui.QStandardItem()
- item.setData(uid, MeasurementDataModel._idRole)
- item.setData(desc, MeasurementDataModel.descRole)
- self.appendRow(item)
- self.sort(0)
- return item
-
- @QtCore.Slot(object, object, object)
- def update(self, device, channel, data):
- '''Updates the data for the device (+channel) with the most recent
- measurement from the given payload.'''
-
- item = self.getItem(device, channel)
-
- value, unit, mqflags = data
- value_str = self.format_value(value)
- unit_str = self.format_unit(unit)
- mqflags_str = self.format_mqflags(mqflags)
-
- disp = ' '.join([value_str, unit_str, mqflags_str])
- item.setData(disp, QtCore.Qt.DisplayRole)
-
-class MultimeterDelegate(QtGui.QStyledItemDelegate):
- '''Delegate to show the data items from a MeasurementDataModel.'''
-
- def __init__(self, parent, font):
- '''Initializes the delegate.
-
- :param font: Font used for the description text, the value is drawn
- with a slightly bigger and bold variant of the font.
- '''
-
- super(self.__class__, self).__init__(parent)
-
- self._nfont = font
- self._bfont = QtGui.QFont(self._nfont)
-
- self._bfont.setBold(True)
- if self._bfont.pixelSize() != -1:
- self._bfont.setPixelSize(self._bfont.pixelSize() * 1.8)
- else:
- self._bfont.setPointSizeF(self._bfont.pointSizeF() * 1.8)
-
- fi = QtGui.QFontInfo(self._nfont)
- self._nfontheight = fi.pixelSize()
-
- fm = QtGui.QFontMetrics(self._bfont)
- r = fm.boundingRect('-XX.XXXXXX X XX')
- self._size = QtCore.QSize(r.width() * 1.2, r.height() * 3.5)
-
- def sizeHint(self, option=None, index=None):
- return self._size
-
- def paint(self, painter, options, index):
- value = index.data(QtCore.Qt.DisplayRole)
- desc = index.data(MeasurementDataModel.descRole)
-
- # description in the top left corner
- painter.setFont(self._nfont)
- p = options.rect.topLeft()
- p += QtCore.QPoint(self._nfontheight, 2 * self._nfontheight)
- painter.drawText(p, desc)
-
- # value in the center
- painter.setFont(self._bfont)
- r = options.rect.adjusted(self._nfontheight, 2.5 * self._nfontheight,
- 0, 0)
- painter.drawText(r, QtCore.Qt.AlignCenter, value)
-
-class EmptyMessageListView(QtGui.QListView):
- '''List view that shows a message if the model im empty.'''
-
- def __init__(self, message, parent=None):
- super(self.__class__, self).__init__(parent)
-
- self._message = message
-
- def paintEvent(self, event):
- m = self.model()
- if m and m.rowCount():
- super(self.__class__, self).paintEvent(event)
- return
-
- painter = QtGui.QPainter(self.viewport())
- painter.drawText(self.rect(), QtCore.Qt.AlignCenter, self._message)
-
-class SigrokMeter(QtGui.QMainWindow):
- '''The main window of the application.'''
-
- def __init__(self, context, drivers):
- super(SigrokMeter, self).__init__()
-
- self.context = context
-
- self.delegate = MultimeterDelegate(self, self.font())
- self.model = MeasurementDataModel(self)
- self.model.rowsInserted.connect(self.modelRowsInserted)
-
- self.setup_ui()
-
- self.thread = SamplingThread(self.context, drivers)
- self.thread.measured.connect(self.model.update)
- self.thread.error.connect(self.error)
- self.thread.start()
-
- def setup_ui(self):
- self.setWindowTitle('sigrok-meter')
- # resizing the listView below will increase this again
- self.resize(10, 10)
-
- p = os.path.abspath(os.path.dirname(__file__))
- p = os.path.join(p, 'sigrok-logo-notext.png')
- self.setWindowIcon(QtGui.QIcon(p))
-
- actionQuit = QtGui.QAction(self)
- actionQuit.setText('&Quit')
- actionQuit.setIcon(QtGui.QIcon.fromTheme('application-exit'))
- actionQuit.setShortcut('Ctrl+Q')
- actionQuit.triggered.connect(self.close)
-
- actionAbout = QtGui.QAction(self)
- actionAbout.setText('&About')
- actionAbout.setIcon(QtGui.QIcon.fromTheme('help-about'))
- actionAbout.triggered.connect(self.show_about)
-
- menubar = self.menuBar()
- menuFile = menubar.addMenu('&File')
- menuFile.addAction(actionQuit)
- menuHelp = menubar.addMenu('&Help')
- menuHelp.addAction(actionAbout)
-
- self.listView = EmptyMessageListView('waiting for data...')
- self.listView.setFrameShape(QtGui.QFrame.NoFrame)
- self.listView.viewport().setBackgroundRole(QtGui.QPalette.Window)
- self.listView.viewport().setAutoFillBackground(True)
- self.listView.setMinimumWidth(260)
- self.listView.setSelectionMode(QtGui.QAbstractItemView.NoSelection)
- self.listView.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)
- self.listView.setVerticalScrollMode(QtGui.QAbstractItemView.ScrollPerPixel)
- self.listView.setItemDelegate(self.delegate)
- self.listView.setModel(self.model)
- self.listView.setUniformItemSizes(True)
- self.listView.setMinimumSize(self.delegate.sizeHint())
-
- self.setCentralWidget(self.listView)
- self.centralWidget().setContentsMargins(0, 0, 0, 0)
-
- def closeEvent(self, event):
- self.thread.stop()
- event.accept()
-
- @QtCore.Slot()
- def show_about(self):
- text = textwrap.dedent('''\
- <div align="center">
- <b>sigrok-meter</b><br/>
- 0.1.0<br/>
- Using libsigrok {} (lib version {}).<br/>
- <a href='http://www.sigrok.org'>
- http://www.sigrok.org</a><br/>
- <br/>
- This program comes with ABSOLUTELY NO WARRANTY;<br/>
- for details visit
- <a href='http://www.gnu.org/licenses/gpl.html'>
- http://www.gnu.org/licenses/gpl.html</a>
- </div>
- '''.format(self.context.package_version, self.context.lib_version))
-
- QtGui.QMessageBox.about(self, 'About sigrok-meter', text)
-
- @QtCore.Slot(str)
- def error(self, msg):
- '''Error handler for the sampling thread.'''
- QtGui.QMessageBox.critical(self, 'Error', msg)
- self.close()
-
- @QtCore.Slot(object, int, int)
- def modelRowsInserted(self, parent, start, end):
- '''Resizes the list view to the size of the content.'''
-
- rows = self.model.rowCount()
- dh = self.delegate.sizeHint().height()
- self.listView.setMinimumHeight(dh * rows)
-
-if __name__ == '__main__':