mainwindow.py

   1 ##
   2 ## This file is part of the sigrok-meter project.
   3 ##
   4 ## Copyright (C) 2013 Uwe Hermann <uwe@hermann-uwe.de>
   5 ## Copyright (C) 2014 Jens Steinhauser <jens.steinhauser@gmail.com>
   6 ##
   7 ## This program is free software; you can redistribute it and/or modify
   8 ## it under the terms of the GNU General Public License as published by
   9 ## the Free Software Foundation; either version 2 of the License, or
  10 ## (at your option) any later version.
  11 ##
  12 ## This program is distributed in the hope that it will be useful,
  13 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ## GNU General Public License for more details.
  16 ##
  17 ## You should have received a copy of the GNU General Public License
  18 ## along with this program; if not, write to the Free Software
  19 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  20 ##
  21
  22 import datamodel
  23 import os.path
  24 import qtcompat
  25 import samplingthread
  26 import textwrap
  27
  28 QtCore = qtcompat.QtCore
  29 QtGui = qtcompat.QtGui
  30
  31 class EmptyMessageListView(QtGui.QListView):
  32     '''List view that shows a message if the model im empty.'''
  33
  34     def __init__(self, message, parent=None):
  35         super(self.__class__, self).__init__(parent)
  36
  37         self._message = message
  38
  39     def paintEvent(self, event):
  40         m = self.model()
  41         if m and m.rowCount():
  42             super(self.__class__, self).paintEvent(event)
  43             return
  44
  45         painter = QtGui.QPainter(self.viewport())
  46         painter.drawText(self.rect(), QtCore.Qt.AlignCenter, self._message)
  47
  48 class MainWindow(QtGui.QMainWindow):
  49     '''The main window of the application.'''
  50
  51     def __init__(self, context, drivers):
  52         super(self.__class__, self).__init__()
  53
  54         self.context = context
  55
  56         self.delegate = datamodel.MultimeterDelegate(self, self.font())
  57         self.model = datamodel.MeasurementDataModel(self)
  58         self.model.rowsInserted.connect(self.modelRowsInserted)
  59
  60         self.setup_ui()
  61
  62         self.thread = samplingthread.SamplingThread(self.context, drivers)
  63         self.thread.measured.connect(self.model.update)
  64         self.thread.error.connect(self.error)
  65         self.thread.start()
  66
  67     def setup_ui(self):
  68         self.setWindowTitle('sigrok-meter')
  69         # resizing the listView below will increase this again
  70         self.resize(10, 10)
  71
  72         p = os.path.abspath(os.path.dirname(__file__))
  73         p = os.path.join(p, 'sigrok-logo-notext.png')
  74         self.setWindowIcon(QtGui.QIcon(p))
  75
  76         actionQuit = QtGui.QAction(self)
  77         actionQuit.setText('&Quit')
  78         actionQuit.setIcon(QtGui.QIcon.fromTheme('application-exit'))
  79         actionQuit.setShortcut('Ctrl+Q')
  80         actionQuit.triggered.connect(self.close)
  81
  82         actionAbout = QtGui.QAction(self)
  83         actionAbout.setText('&About')
  84         actionAbout.setIcon(QtGui.QIcon.fromTheme('help-about'))
  85         actionAbout.triggered.connect(self.show_about)
  86
  87         menubar = self.menuBar()
  88         menuFile = menubar.addMenu('&File')
  89         menuFile.addAction(actionQuit)
  90         menuHelp = menubar.addMenu('&Help')
  91         menuHelp.addAction(actionAbout)
  92
  93         self.listView = EmptyMessageListView('waiting for data...')
  94         self.listView.setFrameShape(QtGui.QFrame.NoFrame)
  95         self.listView.viewport().setBackgroundRole(QtGui.QPalette.Window)
  96         self.listView.viewport().setAutoFillBackground(True)
  97         self.listView.setMinimumWidth(260)
  98         self.listView.setSelectionMode(QtGui.QAbstractItemView.NoSelection)
  99         self.listView.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)
 100         self.listView.setVerticalScrollMode(QtGui.QAbstractItemView.ScrollPerPixel)
 101         self.listView.setItemDelegate(self.delegate)
 102         self.listView.setModel(self.model)
 103         self.listView.setUniformItemSizes(True)
 104         self.listView.setMinimumSize(self.delegate.sizeHint())
 105
 106         self.setCentralWidget(self.listView)
 107         self.centralWidget().setContentsMargins(0, 0, 0, 0)
 108
 109     def closeEvent(self, event):
 110         self.thread.stop()
 111         event.accept()
 112
 113     @QtCore.Slot()
 114     def show_about(self):
 115         text = textwrap.dedent('''\
 116             <div align="center">
 117                 <b>sigrok-meter</b><br/>
 118                 0.1.0<br/>
 119                 Using libsigrok {} (lib version {}).<br/>
 120                 <a href='http://www.sigrok.org'>
 121                          http://www.sigrok.org</a><br/>
 122                 <br/>
 123                 This program comes with ABSOLUTELY NO WARRANTY;<br/>
 124                 for details visit
 125                 <a href='http://www.gnu.org/licenses/gpl.html'>
 126                          http://www.gnu.org/licenses/gpl.html</a>
 127             </div>
 128         '''.format(self.context.package_version, self.context.lib_version))
 129
 130         QtGui.QMessageBox.about(self, 'About sigrok-meter', text)
 131
 132     @QtCore.Slot(str)
 133     def error(self, msg):
 134         '''Error handler for the sampling thread.'''
 135         QtGui.QMessageBox.critical(self, 'Error', msg)
 136         self.close()
 137
 138     @QtCore.Slot(object, int, int)
 139     def modelRowsInserted(self, parent, start, end):
 140         '''Resizes the list view to the size of the content.'''
 141
 142         rows = self.model.rowCount()
 143         dh = self.delegate.sizeHint().height()
 144         self.listView.setMinimumHeight(dh * rows)