예제 #1
0
class MainWidget(QWidget):  
    """Main window class that provides logic of the program.
    Allows to search concept and to show
    information about concepts and relations """
    def __init__(self, parent=None, application=None):
        super().__init__(parent)
        self.parent = parent
        self.application = application
        self.db = self.openDatabase()
        self.initUI()


    def initActions(self):
        """initalization of actions for main windows"""

        self.help_action = QAction("&Help", self)
        self.help_action.setShortcut("F1")
        self.help_action.setStatusTip('Help')
        self.help_action.triggered.connect(lambda: HelpDialog(self))

        self.about_action = QAction("&About", self)
        self.about_action.setStatusTip('About')
        self.about_action.triggered.connect(self.showAboutMessage)        

        self.new_db_action = QAction("New DB", self)
        self.new_db_action.setShortcut("Ctrl+N")
        self.new_db_action.triggered.connect(self.openNewDB)

        self.delete_сoncept_action = QAction("&Delete", self)
        self.delete_сoncept_action.setShortcut("DEL")
        self.delete_сoncept_action.setStatusTip("Delete")
        self.delete_сoncept_action.triggered.connect(lambda: self.delete(Concept))

        self.delete_subcategory_action = QAction("&Delete subcategory", self)
        self.delete_subcategory_action.triggered.connect(lambda: self.delete(Subcategory))

        self.edit_concept_action = QAction("&Edit", self)
        self.edit_concept_action.setShortcut("F2")
        self.edit_concept_action.triggered.connect(self.editConcept)

        self.edit_relation_action = QAction("&Edit", self)
        self.edit_relation_action.setShortcut("Ctrl+F2")
        self.edit_relation_action.triggered.connect(self.editRelation)

        self.exit_action = QAction("&Exit", self)
        self.exit_action.setShortcut("ESC")
        self.exit_action.triggered.connect(self.close)

        self.select_relation_action = QAction("&Select relation", self)
        self.select_relation_action.triggered.connect(self.setRelationDescription)

        self.delete_relation_action = QAction("&Delete", self)
        self.delete_relation_action.setShortcut("Ctrl+DEL")
        self.delete_relation_action.triggered.connect(lambda: self.delete(Relation))

        
    def showAboutMessage(self):
        try:
            with open("about.txt") as f:
                text = f.read()
                QMessageBox.about(self.parent, "About application", text)
        except: pass
            
    def openNewDB(self):
        """This method deletes setting.py file and closes current application session.
        This uses for creating a new instance of Main Window.
        """
        if os.path.exists("setting.py"):
            os.remove("setting.py")
            self.parent.close()
            self.application.exit(1)
            


    def initUI(self):
        
        self.initActions()
        self.add_data_button = QPushButton("Add data", self)
        self.export_button = QPushButton("Export references", self)
        self.search_box = QGroupBox()
        self.concept_list = QListWidget(self)
        self.relation_list = QListWidget(self)
        self.result_table = QTextEdit(self)
        
        self.concept_list.selectionModel().selectionChanged.connect(self.searchRelations)
        
        self.concept_list.setSelectionMode(QAbstractItemView.ContiguousSelection)
        self.concept_list.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        self.concept_list.setContextMenuPolicy(Qt.CustomContextMenu)
        self.concept_list.customContextMenuRequested.connect(self.showConceptContextMenu)
        self.relation_list.setContextMenuPolicy(Qt.CustomContextMenu)
        self.relation_list.customContextMenuRequested.connect(self.showRelationContextMenu)
        self.relation_list.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
    
        self.relation_list.selectionModel().selectionChanged.connect(self.setRelationDescription)
        
        self.initSearchFrame(self.search_box)        
        self.grid = QGridLayout()
        self.result_table.setReadOnly(True)
        self.search()
        self.configWidgets()
        self.bindWidgets()
        self.show()
            
    def showConceptContextMenu(self, pos):
        if not len(self.concept_list.selectedItems()) == 1:
            return 
        global_position = self.concept_list.mapToGlobal(pos)
        my_menu = QMenu()
        my_menu.addAction(self.edit_concept_action)
        my_menu.addAction(self.delete_сoncept_action)
        my_menu.addAction(self.delete_subcategory_action)
        my_menu.addSeparator()
        my_menu.addAction(self.help_action)
        my_menu.addAction(self.exit_action)
        my_menu.exec(global_position)


    def initSearchFrame(self, frame):
        self.search_line = QLineEdit(frame)
        checkboxes = QGroupBox()
        checkboxes.setStyleSheet("border:0;")
        self.concept_checkbox = QCheckBox("Concept", checkboxes)
        self.description_checkbox = QCheckBox("Description", checkboxes)
        self.study_checkbox = QCheckBox("Study", checkboxes)
        self.reference_checkbox = QCheckBox("Reference", checkboxes)
        self.in_selected_checkbox = QCheckBox("Search in selected concepts", checkboxes)
        self.search_button = QPushButton("Search", checkboxes)
        
        
        checkboxes_layout = QGridLayout(checkboxes)
        checkboxes_layout.addWidget(self.concept_checkbox, 0, 0)
        checkboxes_layout.addWidget(self.description_checkbox, 0, 1)
        checkboxes_layout.addWidget(self.study_checkbox, 0, 2)
        checkboxes_layout.addWidget(self.reference_checkbox, 0, 3)
        checkboxes_layout.addWidget(self.in_selected_checkbox, 0, 4)
        
        checkboxes_layout.setContentsMargins(0, 0, 0, 0)
        self.concept_checkbox.setChecked(True)
        self.in_selected_checkbox.setChecked(True)
        grid = QGridLayout(frame)
        grid.addWidget(self.search_line, 1, 0)
        grid.addWidget(self.search_button, 1, 1)
        grid.addWidget(checkboxes, 2, 0, Qt.AlignLeft)
        frame.setLayout(grid)


    def getSearchData(self):
        """This method reads parameters of search line and checkboxes,
        and returns "Subcategory" class.
        None and [] uses for showing checkboxes that have been checked.
        """
        concept = self.search_line.text() if self.concept_checkbox.isChecked() else None
        
        if self.reference_checkbox.isChecked():
            reference = [
                #RelationReference(text=self.search_line.text()), 
                ConceptReference(text=self.search_line.text())
            ]  
        else:
            reference = []
        
        if self.description_checkbox.isChecked():
            description = [Description(text=self.search_line.text(), reference=reference)]
        else:
            description = [Description(reference=reference)]
    
        study = self.search_line.text() if self.study_checkbox.isChecked() else None
        
        if self.in_selected_checkbox.isChecked and len(self.concept_list.selectedItems()) > 1:
            selected_items_raw = self.concept_list.selectedItems()
            selected_items = [item.data(Qt.UserRole)[1] for item in selected_items_raw] 
        else:
            selected_items = []
        
        return Subcategory(subcategory=concept, description=description, study=study), selected_items

    # todo: doesn't work, becouse  need html + bib --> rendered bib
    def searchRelations(self):
        
        """This method triggers when the user clicked on the concept.
        This method selected ID of a subcategory from selected item in conceptions list
        and then searches and setting all information about this selected concept.
        """
        if not self.concept_list.selectedItems():
            self.setConceptDescription()
            self.setResult([], self.relation_list)
            return
        subcategory_id = self.concept_list.selectedItems()[0].data(Qt.UserRole)[1].id
        self.setConceptDescription()
        result = self.db.search_relation(subcategory_id)
        self.setResult(result, self.relation_list)


    def showRelationContextMenu(self, pos):
        global_position = self.relation_list.mapToGlobal(pos)
        my_menu = QMenu()
        my_menu.addAction(self.edit_relation_action)
        my_menu.addAction(self.delete_relation_action)
        my_menu.addSeparator()
        my_menu.exec(global_position)


    def editRelation(self):
        """This method opens dialog for editing Relation"""

        if hasSlelectedItems(self.relation_list):
            relation = self.relation_list.selectedItems()[0].data(Qt.UserRole)[2]
            dlg = EditRelationDialog(self, relation)
            if dlg.exec_():
                relation = dlg.getValue()
                self.db.update_relation(relation)
                self.select_relation_action.trigger()


    def editConcept(self):
        """This method opens dialog for editing Concept"""
        
        if hasSlelectedItems(self.concept_list):
            concept = self.concept_list.selectedItems()[0].data(Qt.UserRole)[0]
            subcategory = self.concept_list.selectedItems()[0].data(Qt.UserRole)[1]
            dlg = EditConceptDialog(self, concept, subcategory)
            
            if dlg.exec_():
                concept, subcategory = dlg.getValue()
                self.db.update_concept(concept)
                self.db.update_subcategory(subcategory)
                self.search()


    def delete(self, something):
        """This universal method for deleting something from the list and database.
        "something" parameter needs to be any of this types: Concept, Subcategory, Relation
        """
        if something == Concept:
            number = 0
            target_list = self.concept_list
        elif something == Subcategory:
            number = 1
            target_list = self.concept_list
        elif something == Relation:
            number = 2
            target_list = self.relation_list
        if hasSlelectedItems(target_list):
            something = target_list.selectedItems()[0].data(Qt.UserRole)[number]
            self.db.delete(something)
            self.search()


    # need refactoring
    def setRelationDescription(self):
        """This method retrieves information about relation,
        formats and sets it in description field.
        """
        if hasSlelectedItems(self.relation_list):
            relation = self.relation_list.selectedItems()[0].data(Qt.UserRole)[2]
            concept1 = "{}{}".format(relation.node1.concept.name,
                                     ", {}".format(relation.node1.subcategory) if relation.node1.subcategory else "")
            concept2 = "{}{}".format(relation.node2.concept.name,
                                     ", {}".format(relation.node2.subcategory) if relation.node2.subcategory else "")

            description = relation.description
            study = relation.study
            references = relation.reference

            # HTML is used for a better information formating
            text = "<b>Relation between </b> \"{}\" <b>and</b> \"{}\"<p>".format(concept1, concept2)
            text += r"<b>Description:</b>" + "<br> {} <p>".format(description)
            text += r"<b>Study:</b> {} <p>".format(study)
            text += r"<b>References:</b><ol>"
            for ref in references:
                text += " <li> {} </li>".format(getBibRenderFromHTML(ref.text))
            text += "</ol><br>"
            self.result_table.setHtml(text)
        else:
            self.result_table.clear()

    # need refactoring
    def setConceptDescription(self):
        """This method retrieves information about concept,
        formats and sets it in description field.
        """
        if not self.concept_list.selectedItems():
            self.result_table.setHtml("")
            return 
        concept = self.concept_list.selectedItems()[0].data(Qt.UserRole)[0]
        subcategory = self.concept_list.selectedItems()[0].data(Qt.UserRole)[1]
        description = subcategory.description

        # HTML is used for a better information formating
        text = "<b>Concept:</b> {}<p>".format(concept.name)
        text += "<b>Subcategory:</b> {}<p>".format(subcategory.subcategory)
        text += "<b>Synonyms:</b> {}<p>".format(concept.synonyms)
        text += "<ol>"
        for des in description:
            text += "<li> {}".format("<b>Description:</b> <br>")
            text += "  {} <p>".format(des.text)
            text += "<ol>"
            text += "<b>References: </b>"
            for ref in des.reference:
                text += "<li>"
                text += "{}".format(getBibRenderFromHTML(ref.text))
                text += "</li>"
            text += "</ol>"
            text += "</li>"
        text += "</ol>"
        self.result_table.setHtml(text)


    def setResult(self, result, list):
        """This is a universal method for showing information
        in a relation field or in a concept field.
        """
        list.clear()
        for concept, subcategory, *other in result:
            item = QListWidgetItem()
            item.setData(Qt.UserRole, (concept, subcategory, *other))
            item.setText("{}{} {}".format(concept.name,
                                          "" if subcategory.subcategory == "" else ", ",
                                          subcategory.subcategory))
            list.insertItem(0, item)


    def search(self):
        subcategory, selected_items = self.getSearchData()
        result = self.db.search_nodes(subcategory, selected_items)
        self.setResult([], self.relation_list)
        self.setResult(result, self.concept_list)
        self.setResult([], self.relation_list)
        self.setRelationDescription()


    def configWidgets(self):
        self.grid.setAlignment(Qt.AlignTop)
        self.grid.setSpacing(5)

        self.menu_bar = QMenuBar(self)

        self.database_menu = self.menu_bar.addMenu("Database")
        self.database_menu.addAction(self.new_db_action)
        self.database_menu.addSeparator()
        self.database_menu.addAction(self.exit_action)

        self.concept_menu = self.menu_bar.addMenu("Concept")
        self.concept_menu.addAction(self.edit_concept_action)
        self.concept_menu.addAction(self.delete_сoncept_action)
        self.concept_menu.addAction(self.delete_subcategory_action)

        self.relation_menu = self.menu_bar.addMenu("Relation")
        self.relation_menu.addAction(self.edit_relation_action)
        self.relation_menu.addAction(self.delete_relation_action)

        self.help_menu = self.menu_bar.addMenu("Help")
        self.help_menu.addAction(self.help_action)
        self.help_menu.addAction(self.about_action)

        self.grid.setMenuBar(self.menu_bar)

        self.concept_box = QGroupBox("Concepts")
        self.concept_grid = QGridLayout()
        self.concept_grid.setContentsMargins(0, 10, 0, 0)
        self.concept_grid.addWidget(self.concept_list)
        self.concept_box.setLayout(self.concept_grid)

        self.relation_box = QGroupBox("Relations")
        self.relation_grid = QGridLayout()
        self.relation_grid.setContentsMargins(0, 10, 0, 0)
        self.relation_grid.addWidget(self.relation_list)
        self.relation_box.setLayout(self.relation_grid)

        self.description_box = QGroupBox("Description")
        self.description_grid = QGridLayout()
        self.description_grid.setContentsMargins(0, 10, 0, 0)
        self.description_grid.addWidget(self.result_table)
        self.description_box.setLayout(self.description_grid)

        self.concept_splitter = QSplitter(self)
        self.concept_splitter.addWidget(self.concept_box)
        self.concept_splitter.addWidget(self.relation_box)
        self.description_splitter = QSplitter(self)
        self.description_splitter.setOrientation(Qt.Vertical)
        self.description_splitter.addWidget(self.concept_splitter)
        self.description_splitter.addWidget(self.description_box)

        self.grid.addWidget(self.add_data_button, 1, 0, Qt.AlignLeft)
        self.grid.addWidget(self.export_button, 1, 1, Qt.AlignRight)
        self.grid.addWidget(self.search_box, 2, 0, 1, 2)
        self.grid.addWidget(self.description_splitter, 5, 0, 1, 2)
        self.setLayout(self.grid)


    def bindWidgets(self):
        self.add_data_button.clicked.connect(self.addData)
        self.search_button.clicked.connect(self.search)
        self.export_button.clicked.connect(self.exportReferences)
        self.search_line.returnPressed.connect(self.search)
        
    def exportReferences(self):
        references = self.db.get_all_references()
        references = [getPlainText(ref.text) for ref in references]
        references = list(set(references))
        references = [prepareBibStr(ref) for ref in references]
        final_text = ",\n\n".join(references)
        
        dlg = QFileDialog()
        file_path = dlg.getSaveFileName(self, "Save bibtex file")[0]
        if not (file_path == ""):
            # todo: check readBibsFromFile
            try:
                with open(file_path, 'w') as f:
                    f.write(final_text)
            except Exception as error:
                showError(error)
                
        
    def addData(self):
        dlg = NewDataDialog(self.db)
        dlg.exec_()
        self.search()

    def getPath(self):
        dialog = NewDBDialog()
        if dialog.exec_():
            
            path = dialog.path
            with open("setting.py", "w") as f:
                f.write("{{ 'last': r'{0}' }}".format(path))
            return path
        else:
            self.close()


    def openDatabase(self):
        if os.path.exists("setting.py"):
            with open("setting.py") as f:
                setting = eval(f.read())
            if "last" in setting:
                if os.path.exists(setting["last"]):
                    path = setting["last"]
                else:
                    path = self.getPath()
            else:
                path = self.getPath()
        else:
            path = self.getPath()
        if path is None:
            self.close()
            exit(0)
        else:
            return Graph(path)
        
    def closeEvent(self, event):
        event.ignore()
예제 #2
0
class MainWindow(QWidget):
    """Main window class that provides logic of the program.
    Allows to search concept and to show
    information about concepts and relations """
    def __init__(self, application):
        super().__init__()
        self.application = application
        self.db = self.openDatabase()
        self._initUI()


    def initActions(self):
        """initalization of actions for main windows"""

        self.help_action = QAction("&Help", self)
        self.help_action.setShortcut("F1")
        self.help_action.setStatusTip('Help')
        self.help_action.triggered.connect(lambda: HelpDialog(self))

        self.new_db_action = QAction("New DB", self)
        self.new_db_action.setShortcut("Ctrl+N")
        self.new_db_action.triggered.connect(self.openNewDB)

        self.delete_сoncept_action = QAction("&Delete", self)
        self.delete_сoncept_action.setShortcut("DEL")
        self.delete_сoncept_action.setStatusTip("Delete")
        self.delete_сoncept_action.triggered.connect(lambda: self.delete(Concept))

        self.delete_subcategory_action = QAction("&Delete subcategory", self)
        self.delete_subcategory_action.triggered.connect(lambda: self.delete(Subcategory))

        self.edit_concept_action = QAction("&Edit", self)
        self.edit_concept_action.setShortcut("F2")
        self.edit_concept_action.triggered.connect(self.editConcept)

        self.edit_relation_action = QAction("&Edit", self)
        self.edit_relation_action.setShortcut("Ctrl+F2")
        self.edit_relation_action.triggered.connect(self.editRelation)

        self.exit_action = QAction("&Exit", self)
        self.exit_action.setShortcut("ESC")
        self.exit_action.triggered.connect(self.close)

        self.select_relation_action = QAction("&Select relation", self)
        self.select_relation_action.triggered.connect(self.setRelationDescription)

        self.delete_relation_action = QAction("&Delete", self)
        self.delete_relation_action.setShortcut("Ctrl+DEL")
        self.delete_relation_action.triggered.connect(lambda: self.delete(Relation))


    def openNewDB(self):
        """This method deletes setting.py file and closes current application session.
        This uses for creating a new instance of Main Window.
        """
        if os.path.exists("setting.py"):
            os.remove("setting.py")
            self.application.exit(1)


    def _initUI(self):
        self.setWindowIcon(QIcon("logo.png"))
        self.setWindowTitle('GraphNotes')
        self.resize(1000, 700)
        self.initActions()
        self.add_data_button = QPushButton("Add data", self)
        self.search_box = QGroupBox()
        self._initSearchFrame(self.search_box)
        self.concept_list = QListWidget(self)
        self.relation_list = QListWidget(self)
        self.result_table = QTextEdit(self)
        self.concept_list.itemClicked.connect(self.searchRelations)
        self.concept_list.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        self.concept_list.setContextMenuPolicy(Qt.CustomContextMenu)
        self.concept_list.customContextMenuRequested.connect(self._showConceptContextMenu)
        self.relation_list.setContextMenuPolicy(Qt.CustomContextMenu)
        self.relation_list.customContextMenuRequested.connect(self._showRelationContextMenu)
        self.relation_list.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        self.relation_list.itemClicked.connect(self.setRelationDescription)
        self.grid = QGridLayout()
        self.result_table.setReadOnly(True)
        self.search()
        self._configWidgets()
        self._bindWidgets()
        self.show()


    def _showConceptContextMenu(self, pos):
        global_position = self.concept_list.mapToGlobal(pos)
        my_menu = QMenu()
        my_menu.addAction(self.edit_concept_action)
        my_menu.addAction(self.delete_сoncept_action)
        my_menu.addAction(self.delete_subcategory_action)
        my_menu.addSeparator()
        my_menu.addAction(self.help_action)
        my_menu.addAction(self.exit_action)
        my_menu.exec(global_position)


    def _initSearchFrame(self, frame):
        self.search_line = QLineEdit(frame)
        checkboxes = QGroupBox()
        checkboxes.setStyleSheet("border:0;")
        self.concept_checkbox = QCheckBox("Concept", checkboxes)
        self.description_checkbox = QCheckBox("Description", checkboxes)
        self.study_checkbox = QCheckBox("Study", checkboxes)
        self.search_button = QPushButton("Search", checkboxes)
        checkboxes_layout = QGridLayout(checkboxes)
        checkboxes_layout.addWidget(self.concept_checkbox, 0, 0)
        checkboxes_layout.addWidget(self.description_checkbox, 0, 1)
        checkboxes_layout.addWidget(self.study_checkbox, 0, 2)
        checkboxes_layout.setContentsMargins(0, 0, 0, 0)
        self.concept_checkbox.setChecked(True)
        grid = QGridLayout(frame)
        grid.addWidget(self.search_line, 1, 0)
        grid.addWidget(self.search_button, 1, 1)
        grid.addWidget(checkboxes, 2, 0, Qt.AlignLeft)
        frame.setLayout(grid)


    def getSearchData(self):
        """This method reads parameters of search line and checkboxes,
        and returns "Subcategory" class.
        None and [] uses for showing checkboxes that have been checked.
        """
        concept = self.search_line.text() if self.concept_checkbox.isChecked() else None
        description = [Description(text=self.search_line.text())] if self.description_checkbox.isChecked() else []
        study = self.search_line.text() if self.study_checkbox.isChecked() else None
        return Subcategory(subcategory=concept, description=description, study=study)


    def searchRelations(self):
        """This method triggers when the user clicked on the concept.
        This method selected ID of a subcategory from selected item in conceptions list
        and then searches and setting all information about this selected concept.
        """
        subcategory_id = self.concept_list.selectedItems()[0].data(Qt.UserRole)[1].id
        self.setConceptDescription()
        result = self.db.search_relation(subcategory_id)
        self.setResult(result, self.relation_list)


    def _showRelationContextMenu(self, pos):
        global_position = self.relation_list.mapToGlobal(pos)
        my_menu = QMenu()
        my_menu.addAction(self.edit_relation_action)
        my_menu.addAction(self.delete_relation_action)
        my_menu.addSeparator()
        my_menu.exec(global_position)


    def editRelation(self):
        """This method opens dialog for editing Relation"""

        if self.relation_list.currentIndex().isValid():
            relation = self.relation_list.selectedItems()[0].data(Qt.UserRole)[2]
            dlg = EditRelationDialog(self, relation)
            if dlg.exec_():
                relation = dlg.getValue()
                self.db.update_relation(relation)
                self.select_relation_action.trigger()


    def editConcept(self):
        """This method opens dialog for editing Concept"""
        if self.concept_list.currentIndex().isValid():
            concept = self.concept_list.selectedItems()[0].data(Qt.UserRole)[0]
            subcategory = self.concept_list.selectedItems()[0].data(Qt.UserRole)[1]
            dlg = EditConceptDialog(self, concept, subcategory)
            if dlg.exec_():
                concept, subcategory = dlg.getValue()
                self.db.update_concept(concept)
                self.db.update_subcategory(subcategory)
                self.search()


    def delete(self, something):
        """This universal method for deleting something from the list and database.
        "something" parameter needs to be any of this types: Concept, Subcategory, Relation
        """
        if something == Concept:
            number = 0
            target_list = self.concept_list
        elif something == Subcategory:
            number = 1
            target_list = self.concept_list
        elif something == Relation:
            number = 2
            target_list = self.relation_list
        if target_list.currentIndex().isValid():
            something = target_list.selectedItems()[0].data(Qt.UserRole)[number]
            self.db.delete(something)
            self.search()


    def setRelationDescription(self):
        """This method retrieves information about relation,
        formats and sets it in description field.
        """
        if self.relation_list.currentIndex().isValid():
            relation = self.relation_list.selectedItems()[0].data(Qt.UserRole)[2]
            concept1 = "{}{}".format(relation.node1.concept.name,
                                     ", {}".format(relation.node1.subcategory) if relation.node1.subcategory else "")
            concept2 = "{}{}".format(relation.node2.concept.name,
                                     ", {}".format(relation.node2.subcategory) if relation.node2.subcategory else "")

            description = relation.description
            study = relation.study
            references = relation.reference

            # HTML is used for a better information formating
            text = "<b>Relation between </b> \"{}\" <b>and</b> \"{}\"<p>".format(concept1, concept2)
            text += r"<b>Description:</b>" + "<br> {} <p>".format(description)
            text += r"<b>Study:</b> {} <p>".format(study)
            text += r"<b>References:</b><ol>"
            for ref in references:
                text += " <li> {} </li>".format(ref.text)
            text += "</ol><br>"
            self.result_table.setText(text)
        else:
            self.result_table.clear()


    def setConceptDescription(self):
        """This method retrieves information about concept,
        formats and sets it in description field.
        """
        concept = self.concept_list.selectedItems()[0].data(Qt.UserRole)[0]
        subcategory = self.concept_list.selectedItems()[0].data(Qt.UserRole)[1]
        description = subcategory.description

        # HTML is used for a better information formating
        text = "<b>Concept:</b> {}<p>".format(concept.name)
        text += "<b>Subcategory:</b> {}<p>".format(subcategory.subcategory)
        text += "<b>Synonyms:</b> {}<p>".format(concept.synonyms)
        text += "<ol>"
        for des in description:
            text += "<li> {}".format("<b>Description:</b> <br>")
            text += "  {} <p>".format(des.text)
            text += "<ol>"
            text += "<b>References: </b>"
            for ref in des.reference:
                text += "<li>"
                text += "{}".format(ref.text)
                text += "</li>"
            text += "</ol>"
            text += "</li>"
        text += "</ol>"
        self.result_table.setText(text)


    def setResult(self, result, list):
        """This is a universal method for showing information
        in a relation field or in a concept field.
        """
        list.clear()
        for concept, subcategory, *other in result:
            item = QListWidgetItem()
            item.setData(Qt.UserRole, (concept, subcategory, *other))
            item.setText("{}{} {}".format(concept.name,
                                          "" if subcategory.subcategory == "" else ", ",
                                          subcategory.subcategory))
            list.insertItem(0, item)


    def search(self):
        parameters = self.getSearchData()
        result = self.db.search_nodes(parameters)
        self.setResult([], self.relation_list)
        self.setResult(result, self.concept_list)
        self.setResult([], self.relation_list)
        self.setRelationDescription()


    def _configWidgets(self):
        self.grid.setAlignment(Qt.AlignTop)
        self.grid.setSpacing(5)

        self.menu_bar = QMenuBar(self)

        self.database_menu = self.menu_bar.addMenu("Database")
        self.database_menu.addAction(self.new_db_action)
        self.database_menu.addSeparator()
        self.database_menu.addAction(self.exit_action)

        self.concept_menu = self.menu_bar.addMenu("Concept")
        self.concept_menu.addAction(self.edit_concept_action)
        self.concept_menu.addAction(self.delete_сoncept_action)
        self.concept_menu.addAction(self.delete_subcategory_action)

        self.relation_menu = self.menu_bar.addMenu("Relation")
        self.relation_menu.addAction(self.edit_relation_action)
        self.relation_menu.addAction(self.delete_relation_action)

        self.help_menu = self.menu_bar.addMenu("Help")
        self.help_menu.addAction(self.help_action)

        self.grid.setMenuBar(self.menu_bar)

        self.concept_box = QGroupBox("Concepts")
        self.concept_grid = QGridLayout()
        self.concept_grid.setContentsMargins(0, 10, 0, 0)
        self.concept_grid.addWidget(self.concept_list)
        self.concept_box.setLayout(self.concept_grid)

        self.relation_box = QGroupBox("Relations")
        self.relation_grid = QGridLayout()
        self.relation_grid.setContentsMargins(0, 10, 0, 0)
        self.relation_grid.addWidget(self.relation_list)
        self.relation_box.setLayout(self.relation_grid)

        self.description_box = QGroupBox("Description")
        self.description_grid = QGridLayout()
        self.description_grid.setContentsMargins(0, 10, 0, 0)
        self.description_grid.addWidget(self.result_table)
        self.description_box.setLayout(self.description_grid)

        self.concept_splitter = QSplitter(self)
        self.concept_splitter.addWidget(self.concept_box)
        self.concept_splitter.addWidget(self.relation_box)
        self.description_splitter = QSplitter(self)
        self.description_splitter.setOrientation(Qt.Vertical)
        self.description_splitter.addWidget(self.concept_splitter)
        self.description_splitter.addWidget(self.description_box)

        self.grid.addWidget(self.add_data_button, 1, 0, Qt.AlignLeft)
        self.grid.addWidget(self.search_box, 2, 0, 1, 2)
        self.grid.addWidget(self.description_splitter, 5, 0, 1, 2)
        self.setLayout(self.grid)


    def _bindWidgets(self):
        self.add_data_button.clicked.connect(self.addData)
        self.search_button.clicked.connect(self.search)
        self.search_line.returnPressed.connect(self.search)


    def addData(self):
        dlg = NewDataDialog(self.db)
        dlg.exec_()
        self.search()


    def getPath(self):
        dialog = NewDBDialog()
        if dialog.exec_():
            print("EXEc")
            path = dialog.path
            with open("setting.py", "w") as f:
                f.write("{{ 'last': r'{0}' }}".format(path))
            return path
        else:
            self.close()


    def openDatabase(self):
        if os.path.exists("setting.py"):
            with open("setting.py") as f:
                setting = eval(f.read())
            if "last" in setting:
                if os.path.exists(setting["last"]):
                    path = setting["last"]
                else:
                    path = self.getPath()
            else:
                path = self.getPath()
        else:
            path = self.getPath()
        if path is None:
            self.close()
            exit(0)
        else:
            return Graph(path)