PluginAssistantEric.py

# -*- coding: utf-8 -*-

# Copyright (c) 2008 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the Eric assistant plugin.
"""

import os

from PyQt5.QtCore import QObject, QTranslator, QCoreApplication

from E5Gui.E5Application import e5App

import Preferences

from AssistantEric.Assistant import AcsAPIs, AcsProject

# Start-Of-Header
name = "Assistant Eric Plugin"
author = "Detlev Offenbach <detlev@die-offenbachs.de>"
autoactivate = True
deactivateable = True
version = "5.3.0"
className = "AssistantEricPlugin"
packageName = "AssistantEric"
shortDescription = "Alternative autocompletion and calltips provider."
longDescription = (
    """This plugin implements an alternative autocompletion and"""
    """ calltips provider."""
)
needsRestart = True
pyqtApi = 2
# End-Of-Header

error = ""

assistantEricPluginObject = None


def createAutoCompletionPage(configDlg):
    """
    Module function to create the autocompletion configuration page.
    
    @param configDlg reference to the configuration dialog
    @return reference to the configuration page
    """
    global assistantEricPluginObject
    from AssistantEric.ConfigurationPages.AutoCompletionEricPage import (
        AutoCompletionEricPage
    )
    return AutoCompletionEricPage(assistantEricPluginObject)
    

def createCallTipsPage(configDlg):
    """
    Module function to create the calltips configuration page.
    
    @param configDlg reference to the configuration dialog
    @return reference to the configuration page
    """
    global assistantEricPluginObject
    from AssistantEric.ConfigurationPages.CallTipsEricPage import (
        CallTipsEricPage
    )
    return CallTipsEricPage(assistantEricPluginObject)
    

def getConfigData():
    """
    Module function returning data as required by the configuration dialog.
    
    @return dictionary containing the relevant data
    """
    try:
        usesDarkPalette = e5App().usesDarkPalette()
    except AttributeError:
        from PyQt5.QtGui import QPalette
        palette = e5App().palette()
        lightness = palette.color(QPalette.ColorRole.Window).lightness()
        usesDarkPalette = lightness <= 128
    iconSuffix = "dark" if usesDarkPalette else "light"
    
    return {
        "ericAutoCompletionPage": [
            QCoreApplication.translate("AssistantEricPlugin", "Eric"),
            os.path.join("AssistantEric", "ConfigurationPages",
                         "eric-{0}".format(iconSuffix)),
            createAutoCompletionPage, "editorAutocompletionPage", None],
        "ericCallTipsPage": [
            QCoreApplication.translate("AssistantEricPlugin", "Eric"),
            os.path.join("AssistantEric", "ConfigurationPages",
                         "eric-{0}".format(iconSuffix)),
            createCallTipsPage, "editorCalltipsPage", None],
    }


def prepareUninstall():
    """
    Module function to prepare for an uninstallation.
    """
    Preferences.Prefs.settings.remove(AssistantEricPlugin.PreferencesKey)
    

class AssistantEricPlugin(QObject):
    """
    Class implementing the Eric assistant plugin.
    """
    PreferencesKey = "AssistantEric"
    
    def __init__(self, ui):
        """
        Constructor
        
        @param ui reference to the user interface object (UI.UserInterface)
        """
        QObject.__init__(self, ui)
        self.__ui = ui
        self.__initialize()
        
        self.__defaults = {
            "AutoCompletionEnabled": False,
            "AutoCompletionSource": AcsAPIs | AcsProject,
            "AutoCompletionFollowHierarchy": False,
            "CalltipsEnabled": False,
            "CallTipsContextShown": True,
            "CallTipsFollowHierarchy": False,
        }
        
        self.__translator = None
        self.__loadTranslator()
    
    def __initialize(self):
        """
        Private slot to (re)initialize the plugin.
        """
        self.__object = None
    
    def __checkQSql(self):
        """
        Private method to perform some checks on QSql.
        
        @return flag indicating QSql is ok (boolean)
        """
        global error
        
        try:
            from PyQt5.QtSql import QSqlDatabase
        except ImportError:
            error = self.tr("PyQt5.QtSql is not available.")
            return False
        
        drivers = QSqlDatabase.drivers()
        if "QSQLITE" not in drivers:
            error = self.tr("The SQLite database driver is not available.")
            return False
        
        return True
    
    def activate(self):
        """
        Public method to activate this plugin.
        
        @return tuple of None and activation status (boolean)
        """
        global error
        error = ""     # clear previous error
        
        if not self.__checkQSql():
            return None, False
        
        global assistantEricPluginObject
        assistantEricPluginObject = self
        
        from AssistantEric.Assistant import Assistant
        
        self.__object = Assistant(self, self.__ui)
        e5App().registerPluginObject("AssistantEric", self.__object)
        
        self.__object.activate()
        
        return None, True
    
    def deactivate(self):
        """
        Public method to deactivate this plugin.
        """
        e5App().unregisterPluginObject("AssistantEric")
        
        self.__object.deactivate()
        
        self.__initialize()
    
    def __loadTranslator(self):
        """
        Private method to load the translation file.
        """
        if self.__ui is not None:
            loc = self.__ui.getLocale()
            if loc and loc != "C":
                locale_dir = os.path.join(
                    os.path.dirname(__file__), "AssistantEric", "i18n")
                translation = "assistant_{0}".format(loc)
                translator = QTranslator(None)
                loaded = translator.load(translation, locale_dir)
                if loaded:
                    self.__translator = translator
                    e5App().installTranslator(self.__translator)
                else:
                    print("Warning: translation file '{0}' could not be"
                          " loaded.".format(translation))
                    print("Using default.")
    
    def getPreferences(self, key):
        """
        Public method to retrieve the various refactoring settings.
        
        @param key the key of the value to get
        @return the requested refactoring setting
        """
        if key in ["AutoCompletionEnabled", "AutoCompletionFollowHierarchy",
                   "CalltipsEnabled", "CallTipsContextShown",
                   "CallTipsFollowHierarchy"]:
            return Preferences.toBool(Preferences.Prefs.settings.value(
                self.PreferencesKey + "/" + key, self.__defaults[key]))
        else:
            return int(Preferences.Prefs.settings.value(
                self.PreferencesKey + "/" + key, self.__defaults[key]))
    
    def setPreferences(self, key, value):
        """
        Public method to store the various refactoring settings.
        
        @param key the key of the setting to be set (string)
        @param value the value to be set
        """
        Preferences.Prefs.settings.setValue(
            self.PreferencesKey + "/" + key, value)
        
        if key in ["AutoCompletionEnabled", "CalltipsEnabled"]:
            self.__object.setEnabled(key, value)

#
# eflag: noqa = M801