Пример #1
0
class Overall(QWizardPage):
    def __init__(self, parent):
        super(Overall, self).__init__(parent)

        self.setTitle("Overall")
        self.setSubTitle("Describe the individual overall.")

        self.comments = QPlainTextEdit(self)
        self.comments.textChanged.connect(self.overall_changed)

        self.registerField("overall.comments*",
                           self.comments,
                           "plainText",
                           SIGNAL("textChanged()"))

        layout = QGridLayout(self)

        layout.addWidget(QLabel(self.tr("Comments:"), self), 0, 0)
        layout.addWidget(self.comments,                      0, 1)

    def overall_changed(self):
        if len(self.comments.toPlainText()) >= 257:
            self.comments.textCursor().deletePreviousChar()
Пример #2
0
class AbstractEntry(QWizardPage):
    def __init__(self, parent, title, sub_title):
        super(AbstractEntry, self).__init__(parent)

        self.setTitle(title)
        self.setSubTitle(sub_title)

        self.score = QComboBox(self)

        self.score.insertItems(5,
                               ["1 - Poor",
                                "2 - Fair",
                                "3 - Good",
                                "4 - Great",
                                "5 - Outstanding"])

        self.comments = QPlainTextEdit(self)
        self.comments.textChanged.connect(self.comments_changed)

        field = "%s.comments*" % title

        self.registerField(field,
                           self.comments,
                           "plainText",
                           SIGNAL("textChanged()"))

        layout = QGridLayout(self)

        layout.addWidget(QLabel(self.tr("Score:"), self),    0, 0)
        layout.addWidget(self.score,                         0, 1)
        layout.addWidget(QLabel(self.tr("Comments:"), self), 1, 0)
        layout.addWidget(self.comments,                      1, 1)

    def comments_changed(self):
        if len(self.comments.toPlainText()) >= 257:
            self.comments.textCursor().deletePreviousChar()
Пример #3
0
class MainWindow(QWidget):
    def __init__(self, fixtures_folder, parent=None):
        QWidget.__init__(self, parent)
        self.current_fixture = None
        self.fixtures_folder = fixtures_folder
        self.setWindowTitle("Frangitron DMX program editor")

        self.text = QPlainTextEdit()
        font = QFont("Monospace")
        font.setStyleHint(QFont.TypeWriter)
        font.setPixelSize(16)
        self.text.setFont(font)
        self.text.setStyleSheet(
            "color: white; background-color: rgb(30, 30, 30)")

        self.combo_fixture = QComboBox()

        self.frame_programs = QWidget()
        self.checkboxes_programs = list()
        self.layout_programs = QGridLayout(self.frame_programs)

        self.spinner_offset = QSpinBox()
        self.spinner_offset.setMinimum(1)
        self.spinner_offset.setMaximum(512)
        self.spinner_offset.setValue(1)
        self.spinner_offset.valueChanged.connect(self.address_changed)

        self.doc = QPlainTextEdit()
        self.doc.setReadOnly(True)
        self.doc.setFont(font)

        self.status = QLabel()

        layout = QGridLayout(self)
        layout.addWidget(self.combo_fixture, 0, 1)
        layout.addWidget(self.spinner_offset, 0, 2)
        layout.addWidget(self.frame_programs, 1, 1)
        layout.addWidget(self.text, 0, 0, 3, 1)
        layout.addWidget(self.doc, 2, 1, 1, 2)
        layout.addWidget(self.status, 3, 0, 1, 3)
        layout.setColumnStretch(0, 60)
        layout.setColumnStretch(1, 40)

        self.resize(1280, 800)

        self.streamer = Streamer(self.fixtures_folder)

        self.combo_fixture.addItems(sorted(self.streamer.fixtures))
        self.combo_fixture.currentIndexChanged.connect(self.fixture_changed)

        self.timer = QTimer()
        self.timer.timeout.connect(self.tick)
        self.timer.start(500.0 / FRAMERATE)
        self.should_reload = True

        self.fixture_changed()

    def selected_programs(self):
        return [
            chk.text() for chk in self.checkboxes_programs if chk.isChecked()
        ]

    def update_programs(self):
        selected_programs = self.selected_programs()

        for checkbox_program in self.checkboxes_programs:
            self.layout_programs.removeWidget(checkbox_program)
            checkbox_program.deleteLater()
        self.checkboxes_programs = list()

        for i, program_name in enumerate(
                sorted(self.current_fixture.programs.keys())):
            column = i // 4
            row = i % 4

            new_checkbox = QCheckBox(program_name)
            new_checkbox.setChecked(program_name in selected_programs)

            self.layout_programs.addWidget(new_checkbox, row, column)
            self.checkboxes_programs.append(new_checkbox)

    def address_changed(self):
        self.current_fixture.address = self.spinner_offset.value()
        self.doc.setPlainText(self.current_fixture.doc())
        self.update_programs()

    def fixture_changed(self):
        self.current_fixture = self.streamer.fixtures[
            self.combo_fixture.currentText()]
        self.address_changed()
        self.streamer.reset_expressions()
        with open(self.current_fixture.programs_filepath, 'r') as f_programs:
            self.text.setPlainText(f_programs.read())

    def tick(self):
        if self.should_reload:
            self.current_fixture.reload_programs()
            self.update_programs()
            self.streamer.reset_state()
            program = PROGRAM.replace('__fixture__', self.current_fixture.name)
            program = program.replace('__address__',
                                      str(self.current_fixture.address))
            program = program.replace(
                '__programs__', ", ".join([
                    '"{}"'.format(prog) for prog in self.selected_programs()
                ]))
            self.streamer.load(programs_source=program)
            self.streamer.program_clicked("1")

        else:
            state = self.streamer.state

            if state:
                self.status.setStyleSheet(
                    "background-color: green; color: white; padding: 5px")
                self.status.setText(state.context)
            else:
                self.status.setStyleSheet(
                    "background-color: red; color: white; padding: 5px")
                self.status.setText("{} : {}".format(state.context,
                                                     state.exception))

            if self.current_fixture is None: return

            with open(self.current_fixture.programs_filepath,
                      'w') as f_programs:
                f_programs.write(self.text.toPlainText())

        self.should_reload = not self.should_reload

    def closeEvent(self, event):
        self.timer.stop()
        self.streamer.load(programs_source="")
        self.streamer.program_clicked("1")
        sleep(2.0 / float(FRAMERATE))
        self.streamer.stop()
        event.accept()
Пример #4
0
class Truss(QMainWindow):
    def __init__(self, parent=None):
        super(Truss, self).__init__(parent)
        self.resize(800, 600)
        self.filename = None
        self.filetuple = None
        self.dirty = False  # Refers to Data Page only.
        centralwidget = QWidget(self)
        gridLayout = QGridLayout(centralwidget)
        self.tabWidget = QTabWidget(centralwidget)
        self.tab = QWidget()
        font = QFont()
        font.setFamily("Courier 10 Pitch")
        font.setPointSize(12)
        self.tab.setFont(font)
        gridLayout_3 = QGridLayout(self.tab)
        self.plainTextEdit = QPlainTextEdit(self.tab)
        gridLayout_3.addWidget(self.plainTextEdit, 0, 0, 1, 1)
        self.tabWidget.addTab(self.tab, "")
        self.tab_2 = QWidget()
        self.tab_2.setFont(font)
        gridLayout_2 = QGridLayout(self.tab_2)
        self.plainTextEdit_2 = QPlainTextEdit(self.tab_2)
        gridLayout_2.addWidget(self.plainTextEdit_2, 0, 0, 1, 1)
        self.tabWidget.addTab(self.tab_2, "")
        gridLayout.addWidget(self.tabWidget, 0, 0, 1, 1)
        self.setCentralWidget(centralwidget)
        menubar = QMenuBar(self)
        menubar.setGeometry(QRect(0, 0, 800, 29))
        menu_File = QMenu(menubar)
        self.menu_Solve = QMenu(menubar)
        self.menu_Help = QMenu(menubar)
        self.setMenuBar(menubar)
        self.statusbar = QStatusBar(self)
        self.setStatusBar(self.statusbar)
        self.action_New = QAction(self)
        self.actionSave_As = QAction(self)
        self.action_Save = QAction(self)
        self.action_Open = QAction(self)
        self.action_Quit = QAction(self)
        self.action_About = QAction(self)
        self.actionShow_CCPL = QAction(self)
        self.action_Solve = QAction(self)
        self.action_CCPL = QAction(self)
        self.action_Help = QAction(self)
        menu_File.addAction(self.action_New)
        menu_File.addAction(self.action_Open)
        menu_File.addAction(self.actionSave_As)
        menu_File.addAction(self.action_Save)
        menu_File.addSeparator()
        menu_File.addAction(self.action_Quit)
        self.menu_Solve.addAction(self.action_Solve)
        self.menu_Help.addAction(self.action_About)
        self.menu_Help.addAction(self.action_CCPL)
        self.menu_Help.addAction(self.action_Help)
        menubar.addAction(menu_File.menuAction())
        menubar.addAction(self.menu_Solve.menuAction())
        menubar.addAction(self.menu_Help.menuAction())
        self.setWindowTitle("Main Window")
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab),\
                                   "Data Page")
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2),\
                                   "Solution Page")
        menu_File.setTitle("&File")
        self.menu_Solve.setTitle("&Solve")
        self.menu_Help.setTitle("&Help")
        self.tabWidget.setCurrentIndex(0)
        self.action_New.setText("&New")
        self.action_Open.setText("&Open")
        self.actionSave_As.setText("Save &As")
        self.action_Save.setText("&Save")
        self.action_Quit.setText("&Quit")
        self.action_Solve.setText("&Solve")
        self.action_About.setText("&About")
        self.action_CCPL.setText("&CCPL")
        self.action_Help.setText("&Help")
        self.action_Quit.triggered.connect(self.close)
        allToolBar = self.addToolBar("AllToolBar")
        allToolBar.setObjectName("AllToolBar")
        self.addActions(allToolBar, (self.action_Open, self.actionSave_As,\
                        self.action_Save, self.action_Solve,\
                        self.action_Quit ))
        self.action_New.triggered.connect(self.fileNew)
        self.action_Open.triggered.connect(self.fileOpen)
        self.actionSave_As.triggered.connect(self.fileSaveAs)
        self.action_Save.triggered.connect(self.fileSave)
        self.action_Solve.triggered.connect(self.trussSolve)
        self.action_About.triggered.connect(self.aboutBox)
        self.action_CCPL.triggered.connect(self.displayCCPL)
        self.action_Help.triggered.connect(self.help)
        self.plainTextEdit.textChanged.connect(self.setDirty)
        self.action_New = self.editAction(self.action_New, None,\
                            'ctrl+N', 'filenew', 'New File.')
        self.action_Open = self.editAction(self.action_Open, None, 'ctrl+O',
                                           'fileopen', 'Open File.')
        self.actionSave_As = self.editAction(self.actionSave_As,\
                            None, 'ctrl+A', 'filesaveas',\
                            'Save and Name File.')
        self.action_Save = self.editAction(self.action_Save, None, 'ctrl+S',
                                           'filesave', 'Save File.')
        self.action_Solve = self.editAction(self.action_Solve, None, 'ctrl+L',
                                            'solve', 'Solve Structure.')
        self.action_About = self.editAction(self.action_About, None, 'ctrl+B',
                                            'about', 'Pop About Box.')
        self.action_CCPL = self.editAction(self.action_CCPL, None, 'ctrl+G',
                                           'licence', 'Show Licence')
        self.action_Help = self.editAction(self.action_Help, None, 'ctrl+H',
                                           'help', 'Show Help Page.')
        self.action_Quit = self.editAction(self.action_Quit, None, 'ctrl+Q',
                                           'quit', 'Quit the program.')
        self.plainTextEdit_2.setReadOnly(True)

    def setDirty(self):
        '''On change of text in textEdit window, set the flag
        "dirty" to True'''
        index = self.tabWidget.currentIndex()
        if index is not 0:
            return
        if self.dirty:
            return True
        self.dirty = True
        self.updateStatus('self.dirty set to True')

    def clearDirty(self):
        'Clear dirty flag'
        self.dirty = False

    def fileNew(self):
        '''Clear both Data Page and Solution Page.'''
        self.plainTextEdit.setPlainText(' ')
        self.plainTextEdit_2.setPlainText(' ')
        self.clearDirty(self)

    def okToContinue(self):
        if self.dirty:
            reply = QMessageBox.question(
                self, "Data Loader - Unsaved Changes", "Save unsaved changes?",
                QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
            if reply == QMessageBox.Cancel:
                return False
            elif reply == QMessageBox.Yes:
                self.clearDirty()
                return self.fileSave()
        return True

    def okRead(self):
        'Pop-up a warning message.'
        reply = QMessageBox.warning(
            self, "Warning",
            '''\nFile Open and Save is possible only in Data Page!
\n\(Use SaveAs for Solution Page)''', QMessageBox.Ok)
        return True

    def fileOpen(self):
        '''Open a file in Data Page (with index == 0)'''
        if self.tabWidget.currentIndex():
            self.okRead()
            return
        if not self.okToContinue():
            return
        dir = (os.path.dirname(self.filename)
               if self.filename is not None else ".")
        self.filetuple = QFileDialog.getOpenFileName(self,\
                        "Open File", dir, \
                        "Data (*.dat *.txt)\nAll Files (*.*)")
        self.filename = self.filetuple[0]
        fname = self.filename
        #  QFileDialog returns a tuple x with x[0] = file name and
        #  x[1] = type of filter.
        if fname:
            self.loadFile(fname)
            self.filename = fname
            self.updateStatus('New file opened.')

    def loadFile(self, fname=None):
        fl = open(fname)
        text = fl.read()
        self.plainTextEdit.setPlainText(text)
        self.dirty = False

    def fileSave(self):
        '''Save file with current file name.'''
        if self.tabWidget.currentIndex():
            self.okRead()
            return
        if self.filename is None:
            return self.fileSaveAs()
        else:
            flname = self.filename
            if flname:
                try:
                    with open(flname, 'w') as fl:
                        fl.write(tempText)
                    self.dirty = False
                    self.updateStatus('File saved.')
                except IOError:
                    self.dirty = True
                    self.updateStatus('File not saved.')
                    return False
                return True
            else:
                self.updateStatus('Failed to save... ')
                return False
        self.filename = None
        self.dirty = False

    def fileSaveAs(self):
        '''Save file with a new name.'''
        qpr = self.qprintline
        fname = self.filename if self.filename is not None else\
        "NoName"
        self.filetuple = QFileDialog.getSaveFileName(
            self, "Truss program - Save File", fname, "Data File (*.*)")
        flname = self.filetuple[0]
        index = self.tabWidget.currentIndex()
        if index == 0:
            self.filename = flname
            if flname:
                fl = open(flname, 'w')
                tempText = self.plainTextEdit.toPlainText()
                fl.write(tempText)
                fl.close()
                self.dirty = False
                self.updateStatus('File saved.')
        elif index == 1:
            if flname:
                fl = open(flname, 'w')
                tempText = self.plainTextEdit_2.toPlainText()
                fl.write(tempText)
                fl.close()

    def trussSolve(self):
        '''Solve a statically determinate truss, specified in
        Data Page and display the results in the Solution Page.
        To start, make a copy of the Data Page with a header all
        shown on the Data Page.'''
        printline = self.qprintline
        dataBall = self.plainTextEdit.toPlainText()
        self.plainTextEdit_2.clear()
        printline('================================')
        flbase = os.path.basename(self.filename)
        printline('SOLUTION FOR ' + flbase)
        printline('================================')
        dataBall = self.plainTextEdit.toPlainText()
        ncrunch.main(printline, self.filename, dataBall)

    def aboutBox(self):
        '''Popup a box with about message.'''
        QMessageBox.about(self, "About PySide, Platform and the like",
                """<b>Part of Structural Analysis.</b> v %s
                <p>Copyright &copy; 2011 Algis Kabaila. 
                All rights reserved in accordance with
                Creative Commons Attribution Licence (CCPL) v3
                or later - NO WARRANTIES!
                <p>This progam finds bar forces in 
                statically determinate trusses.                
                <p>Python %s -  PySide version %s - Qt version %s on\
                %s""" % (__version__, platform.python_version(),\
                PySide.__version__,  PySide.QtCore.__version__,
                platform.system()))

    def displayCCPL(self):
        '''Read and display CCPL licence.'''
        self.plainTextEdit.setPlainText(open('CCPL.txt').read())
        self.dirty = False
        self.filename = 'COPYING.txt'
        self.updateStatus('CCPL displayed.')

    def help(self):
        '''Read and display a help file- currently the README.txt.'''
        self.plainTextEdit.setPlainText(open('README.md').read())
        self.dirty = False
        self.filename = 'README.txt'
        self.updateStatus('README displayed.')

    def addActions(self, target, actions):
        '''Actions are added to Tool Bar.'''
        for action in actions:
            if action is None:
                target.addSeparator()
            else:
                target.addAction(action)

    def editAction(self,
                   action,
                   slot=None,
                   shortcut=None,
                   icon=None,
                   tip=None):
        '''This method adds to action: icon, shortcut, ToolTip,\
        StatusTip and can connect triggered action to slot '''
        if icon is not None:
            action.setIcon(QIcon(":/%s.png" % (icon)))
        if shortcut is not None:
            action.setShortcut(shortcut)
        if tip is not None:
            action.setToolTip(tip)
            action.setStatusTip(tip)
        if slot is not None:
            action.triggered.connect(slot)
        return action

    def qreadline(self, lineNo):
        '''Read one line from Data Page (lineNo starts with 0)'''
        return str(self.plainTextEdit.document().\
            findBlockByLineNumber(lineNo).text()).rstrip()

    def qprintline(self, line):
        '''Append one line to Solution Page.'''
        self.plainTextEdit_2.appendPlainText(line.rstrip())

    def updateStatus(self, message):
        '''Keep status current.'''
        if self.filename is not None:
            flbase = os.path.basename(self.filename)
            self.setWindowTitle(str("Truss Analysis - " +\
                                         flbase + "[*]") )
            self.statusBar().showMessage(message, 5000)
            self.setWindowModified(self.dirty)
Пример #5
0
class Truss(QMainWindow):
    def __init__(self, parent=None):
        super(Truss, self).__init__(parent)        
        self.resize(800, 600)
        self.filename  = None
        self.filetuple = None
        self.dirty = False  # Refers to Data Page only.
        centralwidget = QWidget(self)
        gridLayout = QGridLayout(centralwidget)
        self.tabWidget = QTabWidget(centralwidget)
        self.tab = QWidget()
        font = QFont()
        font.setFamily("Courier 10 Pitch")
        font.setPointSize(12)
        self.tab.setFont(font)
        gridLayout_3 = QGridLayout(self.tab)
        self.plainTextEdit = QPlainTextEdit(self.tab)
        gridLayout_3.addWidget(self.plainTextEdit, 0, 0, 1, 1)
        self.tabWidget.addTab(self.tab, "")
        self.tab_2 = QWidget()
        self.tab_2.setFont(font)
        gridLayout_2 = QGridLayout(self.tab_2)
        self.plainTextEdit_2 = QPlainTextEdit(self.tab_2)
        gridLayout_2.addWidget(self.plainTextEdit_2, 0, 0, 1, 1)
        self.tabWidget.addTab(self.tab_2, "")
        gridLayout.addWidget(self.tabWidget, 0, 0, 1, 1)
        self.setCentralWidget(centralwidget)
        menubar = QMenuBar(self)
        menubar.setGeometry(QRect(0, 0, 800, 29))
        menu_File = QMenu(menubar)
        self.menu_Solve = QMenu(menubar)
        self.menu_Help = QMenu(menubar)
        self.setMenuBar(menubar)
        self.statusbar = QStatusBar(self)
        self.setStatusBar(self.statusbar)
        self.action_New = QAction(self)
        self.actionSave_As = QAction(self)
        self.action_Save = QAction(self)
        self.action_Open = QAction(self)
        self.action_Quit = QAction(self)
        self.action_About = QAction(self)
        self.actionShow_CCPL = QAction(self)
        self.action_Solve = QAction(self)
        self.action_CCPL = QAction(self)
        self.action_Help = QAction(self)
        menu_File.addAction(self.action_New)
        menu_File.addAction(self.action_Open)
        menu_File.addAction(self.actionSave_As)
        menu_File.addAction(self.action_Save)
        menu_File.addSeparator()
        menu_File.addAction(self.action_Quit)
        self.menu_Solve.addAction(self.action_Solve)
        self.menu_Help.addAction(self.action_About)
        self.menu_Help.addAction(self.action_CCPL)
        self.menu_Help.addAction(self.action_Help)
        menubar.addAction(menu_File.menuAction())
        menubar.addAction(self.menu_Solve.menuAction())
        menubar.addAction(self.menu_Help.menuAction())        
        self.setWindowTitle("Main Window")
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab),\
                                   "Data Page")
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2),\
                                   "Solution Page")        
        menu_File.setTitle("&File")        
        self.menu_Solve.setTitle("&Solve")
        self.menu_Help.setTitle("&Help")
        self.tabWidget.setCurrentIndex(0)
        self.action_New.setText("&New") 
        self.action_Open.setText("&Open")       
        self.actionSave_As.setText("Save &As")
        self.action_Save.setText("&Save")
        self.action_Quit.setText("&Quit")        
        self.action_Solve.setText("&Solve")
        self.action_About.setText("&About")
        self.action_CCPL.setText("&CCPL")
        self.action_Help.setText("&Help")
        self.action_Quit.triggered.connect(self.close)
        allToolBar = self.addToolBar("AllToolBar") 
        allToolBar.setObjectName("AllToolBar") 
        self.addActions(allToolBar, (self.action_Open, self.actionSave_As,\
                        self.action_Save, self.action_Solve,\
                        self.action_Quit ))
        self.action_New.triggered.connect(self.fileNew)
        self.action_Open.triggered.connect(self.fileOpen)
        self.actionSave_As.triggered.connect(self.fileSaveAs)
        self.action_Save.triggered.connect(self.fileSave)
        self.action_Solve.triggered.connect(self.trussSolve)
        self.action_About.triggered.connect(self.aboutBox)
        self.action_CCPL.triggered.connect(self.displayCCPL)
        self.action_Help.triggered.connect(self.help)
        self.plainTextEdit.textChanged.connect(self.setDirty)
        self.action_New = self.editAction(self.action_New, None,\
                            'ctrl+N', 'filenew', 'New File.')   
        self.action_Open = self.editAction(self.action_Open, None, 
                            'ctrl+O', 'fileopen', 'Open File.')
        self.actionSave_As = self.editAction(self.actionSave_As,\
                            None, 'ctrl+A', 'filesaveas',\
                            'Save and Name File.')
        self.action_Save = self.editAction(self.action_Save, None, 
                            'ctrl+S', 'filesave', 'Save File.')
        self.action_Solve = self.editAction(self.action_Solve, None, 
                            'ctrl+L', 'solve', 'Solve Structure.')                                   
        self.action_About = self.editAction(self.action_About, None, 
                            'ctrl+B', 'about','Pop About Box.')                                  
        self.action_CCPL = self.editAction(self.action_CCPL, None, 
                            'ctrl+G', 'licence', 'Show Licence') 
        self.action_Help = self.editAction(self.action_Help, None, 
                            'ctrl+H', 'help', 'Show Help Page.')
        self.action_Quit =  self.editAction(self.action_Quit, None, 
                            'ctrl+Q', 'quit', 'Quit the program.')                                           
        self.plainTextEdit_2.setReadOnly(True)
    
    def setDirty(self):
        '''On change of text in textEdit window, set the flag
        "dirty" to True'''
        index = self.tabWidget.currentIndex()
        if index is not 0:
            return
        if self.dirty:
            return True
        self.dirty = True
        self.updateStatus('self.dirty set to True')    
    
    def clearDirty(self):
        'Clear dirty flag'
        self.dirty = False
    
    def fileNew(self):
        '''Clear both Data Page and Solution Page.'''
        self.plainTextEdit.setPlainText(' ')
        self.plainTextEdit_2.setPlainText(' ')
        self.clearDirty(self)

    def okToContinue(self):
        if self.dirty:
            reply = QMessageBox.question(self,
                    "Data Loader - Unsaved Changes",
                    "Save unsaved changes?",
                    QMessageBox.Yes|QMessageBox.No|QMessageBox.Cancel)
            if reply == QMessageBox.Cancel:
                return False
            elif reply == QMessageBox.Yes:
                self.clearDirty()
                return self.fileSave()
        return True
    
    def okRead(self):
        'Pop-up a warning message.'
        reply = QMessageBox.warning(self,
                "Warning",
                '''\nFile Open and Save is possible only in Data Page!
\n\(Use SaveAs for Solution Page)''', QMessageBox.Ok)
        return True

    def fileOpen(self):
        '''Open a file in Data Page (with index == 0)'''
        if self.tabWidget.currentIndex():
            self.okRead()
            return
        if not self.okToContinue():
            return
        dir = (os.path.dirname(self.filename)
               if self.filename is not None else ".")
        self.filetuple = QFileDialog.getOpenFileName(self,\
                        "Open File", dir, \
                        "Data (*.dat *.txt)\nAll Files (*.*)")
        self.filename = self.filetuple[0] 
        fname = self.filename        
#  QFileDialog returns a tuple x with x[0] = file name and 
#  x[1] = type of filter.
        if fname:
            self.loadFile(fname)
            self.filename = fname
            self.updateStatus('New file opened.')
                
    def loadFile(self, fname=None):
        fl = open(fname)
        text = fl.read()
        self.plainTextEdit.setPlainText(text)
        self.dirty = False
    
    def fileSave(self):
        '''Save file with current file name.'''
        if self.tabWidget.currentIndex():
            self.okRead()
            return        
        if self.filename is None:
            return self.fileSaveAs()
        else:
            flname = self.filename
            if flname:
                with open(flname, 'w') as fl:
                    fl.write(tempText)
                self.dirty = False
                self.updateStatus('File saved.')
                return True
            else:
                self.updateStatus('Failed to save... ')
                return False
        self.filename = None
        self.dirty = False

    def fileSaveAs(self):        
        '''Save file with a new name.'''
        qpr = self.qprintline
        fname = self.filename if self.filename is not None else\
        "NoName"
        self.filetuple = QFileDialog.getSaveFileName(self,
                "Truss program - Save File", fname, "Data File (*.*)")
        flname = self.filetuple[0]        
        index = self.tabWidget.currentIndex()
        if index == 0:
            self.filename = flname 
            if flname:
                fl = open(flname, 'w')
                tempText = self.plainTextEdit.toPlainText()
                fl.write(tempText)
                fl.close()
                self.dirty = False
                self.updateStatus('File saved.')   
        elif index == 1:
            if flname:
                fl = open(flname, 'w')
                tempText = self.plainTextEdit_2.toPlainText()
                fl.write(tempText)
                fl.close()

    def trussSolve(self):
        '''Solve a statically determinate truss, specified in
        Data Page and display the results in the Solution Page.
        To start, make a copy of the Data Page with a header all
        shown on the Data Page.'''
        printline = self.qprintline
        dataBall = self.plainTextEdit.toPlainText() 
        self.plainTextEdit_2.clear()
        printline('================================') 
        flbase = os.path.basename(self.filename)
        printline('SOLUTION FOR ' + flbase)
        printline('================================') 
        dataBall = self.plainTextEdit.toPlainText()
        ncrunch.main(printline, self.filename, dataBall)

    def aboutBox(self):
        '''Popup a box with about message.'''
        QMessageBox.about(self, "About PySide, Platform and the like",
                """<b>Part of Structural Analysis.</b> v %s
                <p>Copyright &copy; 2011 Algis Kabaila. 
                All rights reserved in accordance with
                Creative Commons Attribution Licence (CCPL) v3
                or later - NO WARRANTIES!
                <p>This progam finds bar forces in 
                statically determinate trusses.                
                <p>Python %s -  PySide version %s - Qt version %s on\
                %s""" % (__version__, platform.python_version(),\
                PySide.__version__,  PySide.QtCore.__version__,
                platform.system()))
              
    def displayCCPL(self):
        '''Read and display CCPL licence.'''
        self.plainTextEdit.setPlainText(open('CCPL.txt').read())
        self.dirty = False
        self.filename = 'COPYING.txt'
        self.updateStatus('CCPL displayed.')

    def help(self):
        '''Read and display a help file- currently the README.txt.'''
        self.plainTextEdit.setPlainText(open('README.md').read())
        self.dirty = False
        self.filename = 'README.txt'
        self.updateStatus('README displayed.')
        
    def addActions(self, target, actions):
        '''Actions are added to Tool Bar.'''
        for action in actions:
            if action is None:
                target.addSeparator()
            else:
                target.addAction(action)
    
    def editAction(self, action, slot=None, shortcut=None, icon=None,
                     tip=None):
        '''This method adds to action: icon, shortcut, ToolTip,\
        StatusTip and can connect triggered action to slot '''
        if icon is not None:
            action.setIcon(QIcon(":/%s.png" % (icon)))
        if shortcut is not None:
            action.setShortcut(shortcut)
        if tip is not None:
            action.setToolTip(tip)
            action.setStatusTip(tip)
        if slot is not None:
            action.triggered.connect(slot)                        
        return action

    def qreadline(self, lineNo):
        '''Read one line from Data Page (lineNo starts with 0)'''
        return unicode(self.plainTextEdit.document().\
            findBlockByLineNumber(lineNo).text()).rstrip()

    def qprintline(self, line):        
        '''Append one line to Solution Page.'''
        self.plainTextEdit_2.appendPlainText(line.rstrip())

    def updateStatus(self, message):
        '''Keep status current.'''
        if self.filename is not None:
            flbase = os.path.basename(self.filename)
            self.setWindowTitle(unicode("Truss Analysis - " +\
                                         flbase + "[*]") )
            self.statusBar().showMessage(message, 5000)
            self.setWindowModified(self.dirty)