root/tags/dabo-0.2/dApp.py

""" 
    dApp.py : The application object for Dabo.

    This object gets instantiated from the client app's main.py,
    and lives through the life of the application.

        -- set up an empty data connections object which holds 
        -- connectInfo objects connected to pretty names. Entries
        -- can be added programatically, but upon initialiazation
        -- it will look for a file called 'dbConnectionDefs.py' which
        -- contains connection definitions.

        -- Set up a DB Connection manager, that is basically a dictionary
        -- of dConnection objects. This allows connections to be shared
        -- application-wide.

        -- decide which ui to use (wx) and gets that ball rolling

        -- make a system menu bar, based on a combination
        -- of dabo defaults and user resource files.

        -- ditto for toolbar(s)

        -- look for a mainFrame ui resource file in an expected 
        -- place, otherwise uses default dabo mainFrame, and 
        -- instantiate that. 

        -- maintain a forms collection and provide interfaces for
        -- opening dForms, closing them, and iterating through them.

        -- start the main app event loop.

        -- clean up and exit gracefully
"""
import sys, os, warnings
import dabo, dabo.ui, dabo.db
import dabo.common, dSecurityManager
from dLocalize import _

class Collection(list):
    """ 
    Collection : Base class for the various collection
                    classes used in the app object.
    """

    def __init__(self):
        list.__init__(self)

    def add(self, objRef):
        """ 
        Collection.add(objRef)
            Add the object reference to the collection.
        """
        self.append(objRef)

    def remove(self, objRef):
        """ 
        Collection.remove(objRef)
            Delete the object reference from the collection.
        """
        try:
            index = self.index(objRef)
        except ValueError:
            index = None
        if index is not None:
            del self[index]


class dApp(dabo.common.dObject):
    """ dabo.dApp

        The containing object for the entire application.
        Various UI's will have app objects also, which 
        dabo.App is a wrapper for. 
    """
    def __init__(self):
        self._uiAlreadySet = False
        dabo.dAppRef = self
        dApp.doDefault()
        self._initProperties()
        
### PKM: commented this out as I don't understand the need for it       
#       # Params may need to be sent to the main frame. These two 
#       # props allow that
#       self.mainFrameParamList = []
#       self.mainFrameKeyParamList = {}

    def setup(self):
        """ Set up the app - call this before start()."""

        # dabo is going to want to import various things from the homeDir
        sys.path.append(self.homeDir)

        if not self.getAppInfo("appName"):
            self.setAppInfo("appName", "Dabo")
        if not self.getAppInfo("appVersion"):
            self.setAppInfo("appVersion", dabo.version["version"])
        if not self.getAppInfo("vendorName"):
            self.setAppInfo("vendorName", "Dabo")

        self._initDB()
        self._initUI()

        self.uiApp = dabo.ui.uiApp()

        self.actionList.setAction("FileExit", self.uiApp.onFileExit)
        self.actionList.setAction("HelpAbout", self.uiApp.onHelpAbout)
        self.actionList.setAction("EditPreferences", self.uiApp.onEditPreferences)
        self.actionList.setAction("EditCut", self.uiApp.onEditCut)
        self.actionList.setAction("EditCopy", self.uiApp.onEditCopy)
        self.actionList.setAction("EditPaste", self.uiApp.onEditPaste)
        self.actionList.setAction("EditFind", self.uiApp.onEditFind)
        self.actionList.setAction("EditFindAgain", self.uiApp.onEditFindAgain)
        self.actionList.setAction("EditUndo", self.uiApp.onEditUndo)
        self.actionList.setAction("EditRedo", self.uiApp.onEditRedo)

        self.uiApp.setup(self)


    def start(self):
        """ 
        Start the application event loop, which involves
            wrapping the application object for the ui library
            being used.
        """
        if (not self.SecurityManager or not self.SecurityManager.RequireAppLogin
            or self.SecurityManager.login()):
            
            userName = self.getUserCaption()
            if userName:
                userName = " (%s)" % userName
            else:
                userName = ""
                
            self.uiApp.start(self)
        self.finish()


    def finish(self):
        """ 
        The main event loop has exited and the application
            is about to finish.
        """
        self.uiApp.finish()
        dabo.infoLog.write(_("Application finished."))
        pass


    def getAppInfo(self, item):
        """ dApp.getAppInfo(self, item) -> value

            Look up the item, and return the value.
        """
        try:
            retVal = self._appInfo[item]
        except KeyError:
            retVal = None
        return retVal


    def setAppInfo(self, item, value):
        """ dApp.getAppInfo(self, item, value) -> None

            Set item to value in the appinfo table.
        """
        self._appInfo[item] = value


    def getUserSetting(self, item, user="*", system="*"):
        """ Return the value of the user settings table that 
            corresponds to the item, user, and system id 
            passed. Based on the ctype field in the table, 
            convert the return value into the appropriate
            type first.

            Types:    I: Int
                    N: Float
                    C: String
                    M: String
                    D: Date, saved as a string 3-tuple 
                        of integers '(year,month,day)'
                    T: DateTime, saved as a string 
                        9-tuple of integers '(year,month,
                        day,hour,minute,second,?,?,?)'

        """
        import ConfigParser

        configFileName = '%s/.userSettings.ini' % self.homeDir

        cp = ConfigParser.ConfigParser()
        cp.read(configFileName)

        try:
            valueType = cp.get("UserSettingsValueTypes", item)
        except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
            valueType = "C"

        try:
            if valueType == "I":
                value = cp.getint("UserSettings", item)
            elif valueType == "N":
                value = cp.getfloat("UserSettings", item)
            elif valueType == "L":
                value = cp.getboolean("UserSettings", item)
            else:
                value = cp.get("UserSettings", item)
        except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
            value = None

        return value


    def setUserSetting(self, item, valueType, value, user="*", system="*"):
        """ Set the value of the user settings table that corresponds to the
            item, user, and systemid passed. If it doesn't exist in the table,
            add it. See self.getUserSetting() for the type codes. 
        """
        # For now, save this info in a plain ini file. Eventually, I'd like
        # to see this get saved in a persistent dabosettings db table.
        import ConfigParser

        configFileName = '%s/.userSettings.ini' % self.homeDir

        cp = ConfigParser.ConfigParser()
        cp.read(configFileName)

        # convert value to string type for saving to db:
        value = str(value)

        if not cp.has_section("UserSettings"):
            cp.add_section("UserSettings")
        cp.set("UserSettings", item, value)

        if not cp.has_section("UserSettingsValueTypes"):
            cp.add_section("UserSettingsValueTypes")
        cp.set("UserSettingsValueTypes", item, valueType)

        configFile = open(configFileName, 'w')
        cp.write(configFile)
        configFile.close()
        
        
    def getUserCaption(self):
        """ Return the full name of the currently logged-on user.
        """
        if self.SecurityManager:
            return self.SecurityManager.UserCaption
        else:
            return None
            

    def _initProperties(self):
        """ Initialize the public properties of the app object. """

        # it is useful to know from where we came
        # Note: sometimes the runtime distros will alter the path so
        # that the first entry is not a valid directory. Go throught the path
        # and use the first valid directory.
        ###self.homeDir = sys.path[0]
        for pth in sys.path:
            if os.path.exists(os.path.join(pth, ".")):
                self.homeDir = pth
                break
        

        self.uiType   = None    # ('wx', 'qt', 'curses', 'http', etc.)
        #self.uiModule = None

        # Initialize UI collections
        self.uiForms = Collection()
        self.uiMenus = Collection()
        self.uiToolBars = Collection()
        self.uiResources = {}

        self.actionList = dabo.ui.dActionList()

        # Initialize DB collections
        self.dbConnectionDefs = {} 

        self._appInfo = {}

    def _initDB(self):
        """ Set the available connection definitions for use by the app. """

        dbConnectionDefs = None
        try:
            import dbConnectionDefs
            dbConnectionDefs = dbConnectionDefs.getDefs()
        except (ImportError, NameError, AttributeError):
            dbConnectionDefs = None

        if dbConnectionDefs and type(dbConnectionDefs) == type(dict()):
            # For each connection definition, add an entry to 
            # self.dbConnectionDefs that contains a key on the 
            # name, and a value of a dConnectInfo object.
            for entry in dbConnectionDefs:
                try:             dbType   = dbConnectionDefs[entry]['dbType']
                except KeyError: dbType   = None
                try:             host     = dbConnectionDefs[entry]['host']
                except KeyError: host     = None
                try:             user     = dbConnectionDefs[entry]['user']
                except KeyError: user     = None
                try:             password = dbConnectionDefs[entry]['password']
                except KeyError: password = None
                try:             dbName   = dbConnectionDefs[entry]['dbName']
                except KeyError: dbName   = None
                try:             port     = dbConnectionDefs[entry]['port']
                except KeyError: port     = None

                self.dbConnectionDefs[entry] = dabo.db.dConnectInfo(backendName=dbType,
                        host=host, 
                        user=user,
                        password=password,
                        dbName=dbName,
                        port=port)

            dabo.infoLog.write(_("%s database connection definition(s) loaded.") % (
                                                len(self.dbConnectionDefs)))

        else:
            dabo.infoLog.write(_("No database connection definitions loaded (dbConnectionDefs.py)"))


    def _initUI(self):
        """ Set the user-interface library for the application. 
        
        Ignored if the UI was already explicitly set by user code.
        """
        if self.UI is None and not self._uiAlreadySet:
            # For now, default to wx, but it should be enhanced to read an
            # application config file. Actually, that may not be necessary, as the
            # user's main.py can just set the UI directly now: dApp.UI = "qt".
            self.UI = "wx"
        else:
            # Custom app code or the dabo.ui module already set this: don't touch
            dabo.infoLog.write(_("User interface already set to '%s', so dApp didn't "
                " touch it." % (self.UI,)))


    def _getAutoNegotiateUniqueNames(self):
        try:
            return self._autoNegotiateUniqueNames
        except AttributeError:
            return True
    
    def _setAutoNegotiateUniqueNames(self, value):
        self._autoNegotiateUniqueNames = bool(value)
        
    
    def _getMainForm(self):
        try:
            f = self._mainForm
        except AttributeError:
            f = None
            self._mainForm = None
        return f
            
    def _setMainForm(self, val):
        self._mainForm = val

                
    def _getMainFormClass(self):
        try:
            c = self._mainFormClass
        except AttributeError:
            c = dabo.ui.dFormMain
            self._mainFormClass = c
        return c
            
    def _setMainFormClass(self, val):
        self._mainFormClass = val
        
        
    def _getSecurityManager(self):
        try:
            return self._securityManager
        except AttributeError:
            return None
            
    def _setSecurityManager(self, value):
        if isinstance(value, dSecurityManager.dSecurityManager):
            if self.SecurityManager:
                warnings.warn(Warning, _('SecurityManager previously set'))
            self._securityManager = value
        else:
            raise TypeError, _('SecurityManager must descend from dSecurityManager.')
            
            
    def _getUI(self):
        try:
            return dabo.ui.getUIType()
        except AttributeError:
            return None
            
    def _setUI(self, uiType):
        # Load the appropriate ui module. dabo.ui will now contain
        # the classes of that library, wx for instance.
        if self.UI is None:
            if dabo.ui.loadUI(uiType):
                self._uiAlreadySet = True
                dabo.infoLog.write(_("User interface set to '%s' by dApp.") % (uiType,))
            else:
                dabo.infoLog.write(_("Tried to set UI to '%s', but it failed." % (uiType,)))
        else:
            raise RuntimeError, _("The UI cannot be reset once assigned.")
    
    
    AutoNegotiateUniqueNames = property(_getAutoNegotiateUniqueNames,_setAutoNegotiateUniqueNames,
                        None, _("Specifies whether setting an object\'s name to a non-unique "
                        "value results in a unique integer being appended, or whether "
                        "a NameError is raised. Default is True: negotiate the name."))

    MainForm = property(_getMainForm, _setMainForm, None,
        _("The object reference to the main form of the application, or None. This gets "
        "set automatically during application setup, based on the MainFormClass."))
        
    MainFormClass = property(_getMainFormClass, _setMainFormClass, None,
        _("Specifies the class to use to instantiate the main form. Defaults to "
        "the dFormMain base class. Set to None if you don't want a main form."))
        
    UI = property(_getUI, _setUI,
                        None, _("Specifies the user interface to load, or None. "
                        "Once set, it cannot be reassigned."))
    
    SecurityManager = property(_getSecurityManager, _setSecurityManager,
                        None, _("Specifies the Security Manager, if any. You "
                        "must subclass dSecurityManager, overriding the appropriate hooks "
                        "and properties, and then set dApp.SecurityManager to an instance "
                        "of your subclass. There is no security manager by default - you "
                        "explicitly set this to use Dabo security."))