Python: monitoratge d'esdeveniments dels documents

Contingut
Índex 🔎︎

# Monitoratge d'esdeveniments dels documents

Al costat de assignar macros als esdeveniments, es poden monitoritzar els esdeveniments llençats pels documents LibreOffice. Els emissors de la interfície de programació d'aplicacions (API) són responsables de cridar als scripts dels esdeveniments. A diferència dels oients que requereixen definir tots els mètodes suportats, encara que no s'utilitzen, els monitors de documents només requereixen dos mètodes junt amb els scripts dels esdeveniments connectats.

## Escolta els esdeveniments del document

Monitoring is illustrated herewith for Basic and Python languages using object-oriented programming. Assigning OnLoad script, to the Open Document event, suffices to initiate and terminate document event monitoring. Tools - Customize menu Events tab is used to assign either scripts.

Intercepting events helps setting scripts pre- and post-conditions such as loading and unloading libraries or track script processing in the background. Access2Base.Trace module usage is illustrating that second context.

### Amb el Python

El monitoratge d'esdeveniments comença des de la instanciació de l'objecte i finalment s'atura quan Python allibera l'objecte. Els informes dels esdeveniments es llencen utilitzant la consola d'Access2Base.

OnLoad and OnUnload events can be used to respectively set and unset Python programs path. They are described as Open document and Document closed.

             # -*- coding: utf-8 -*-
             from __future__ import unicode_literals

             import os.path, uno, unohelper
             from com.sun.star.document import DocumentEvent, \
                 XDocumentEventListener as AdapterPattern
             from com.sun.star.lang import EventObject

             class UiDocument(unohelper.Base, AdapterPattern):
                 """ Monitorar els esdeveniments del document """
                 '''
                 adaptat de l'script 'Python per monitoritzar l'esdeveniment OnSave' a
                 https://forum.openoffice.org/en/forum/viewtopic.php?t=68887
                 '''
                 def __init__(self):
                     """Monitor d’esdeveniments de documents"""
                     '''informa usant la consola Access2Base.Trace o
                     informa al 1r full, 1a columna per a documents del Calc'''
                     ctx = uno.getComponentContext()
                     smgr = ctx.getServiceManager()
                     desktop = smgr.createInstanceWithContext(
                     'com.sun.star.frame.Desktop' , ctx)
                     self.doc = desktop.CurrentComponent
                     #self.row = 0 # descomentar només pels documents del Calc
                     Console.setLevel("DEBUG")
                     auto.listen() # Inicia el monitoreig d'esdeveniments de documents.

                 @property
                 def Filename(self) -> str:
                     sys_filename = uno.fileUrlToSystemPath(self.doc.URL)
                     return os.path.basename(sys_filename)

                 def setCell(self, calcDoc, txt: str):
                     """Eixida dels esdeveniments del document a la primera columna d'un full de càlcul"""
                     sheet = calcDoc.getSheets().getByIndex(0)
                     sheet.getCellByPosition(0,self.row).setString(txt)
                     self.row = self.row + 1

                 def listen(self, *args):  # OnLoad/OnNew la primera vegada
                     """Inicia el seguiment d'esdeveniments del document """
                     self.doc.addDocumentEventListener(self)
                     Console.log("INFO" "Els esdeveniments del document s'estan registrant", True)

                 def sleep(self *args) # OnUnload la darrera (opcional)
                     """Atura el seguiment dels esdeveniments del document"""
                     self.doc.removeDocumentEventListener(self)
                     Console.log("INFO" "Els esdeveniments del document s'han registrat", True)

                 def documentEventOccured(self, event: DocumentEvent):
                     """Intercepta tots els esdeveniments del document""
                     #self.setCell(event.Source, event.EventName) # only for Calc docs
                     Console.log("DEBUG",
                         event.EventName+" in "+self.Filename,
                         False)

                 def disposing(self, event: EventObject):
                     """Allibera totes les activitats"""
                     self.sleep()
                     Console.show()

             def OnLoad(*args) # Esdeveniment 'Open Document'
                 listener = UiDocument()  # Initiates listening

             def OnUnload(*args) # Esdeveniment 'El document s'ha tancat'
                 pass # (opcional) realitzat durant la supressió

             g_exportedScripts = (OnLoad,)

             from com.sun.star.script.provider import XScript
             class Console():
                 """
                 (Back/Fore)ground console to report/log program execution.
                 """
                 @staticmethod
                 def trace(*args,**kwargs):
                     """ Print free item list to console """
                     scr = Console._a2bScript(script='DebugPrint', module='Compatible')
                     scr.invoke((args),(),())
                 @staticmethod
                 def log(level: str, text: str, msgBox=False):
                     """ Append log message to console, optional user prompt """
                     scr = Console._a2bScript(script='TraceLog')
                     scr.invoke((level,text,msgBox),(),())
                 @staticmethod
                 def setLevel(logLevel: str):
                     """ Set log messages lower limit """
                     scr = Console._a2bScript(script='TraceLevel')
                     scr.invoke((logLevel,),(),())
                 @staticmethod
                 def show():
                     """ Display console content/dialog """
                     scr = Console._a2bScript(script='TraceConsole')
                     scr.invoke((),(),())
                 @staticmethod
                 def _a2bScript(script: str, library='Access2Base',
                     module='Trace') -> XScript:
                     ''' Grab application-based Basic script '''
                     sm = uno.getComponentContext().ServiceManager
                     mspf = sm.createInstanceWithContext(
                         "com.sun.star.script.provider.MasterScriptProviderFactory",
                         uno.getComponentContext())
                     scriptPro = mspf.createScriptProvider("")
                     scriptName = "vnd.sun.star.script:"+library+"."+module+"."+script+"?language=Basic&location=application"
                     xScript = scriptPro.getScript(scriptName)
                     return xScript

Observeu l'error que hi ha al mètode documentEventOccured, que ha heretat una falta d'ortografia de la interfície de programació d'aplicacions (API, segles en anglés) del LibreOffice.

Start application and Close application events can respectively be used to set and to unset Python path for user scripts or LibreOffice scripts. In a similar fashion, document based Python libraries or modules can be loaded and released using Open document and Document closed events. Refer to Importing Python Modules for more information.

### Amb el LibreOffice Basic

The Onload script is assigned to Open document event using Tools - Customize menu Events tab. Events monitoring starts from the moment a ConsoleLogger object is instantiated and ultimately stops when Basic engine releases it. OnLoad event loads necessary Basic libraries, while caught events are reported using Access2Base.Trace module.

              REM Mòdul controller.Events
              Option Explicit
              Private _obj As Object ' controller.ConsoleLogger instance

              Sub OnLoad(evt As com.sun.star.document.DocumentEvent) ' >> Open Document <<
                  _obj = New ConsoleLogger : _obj.Start(evt)
              End Sub ' controller.OnLoad
              ' ----
              REM controller.ConsoleLogger class module
              Option Explicit
              Option Compatible
              Option ClassModule

              ' ADAPTER design pattern object to be instantiated in the "Open Document" event
              Private Const UI_PROMPT = True
              Private Const UI_NOPROMPT = False ' Set it to True to visualise documents events

              ' CONSTRUCTOR/DESTRUCTOR
              Private Sub Class_Initialize()
              End Sub ' controller.ConsoleLogger.Initialize
              Private Sub Class_Terminate()
              End Sub ' controller.ConsoleLogger.Terminate

              ' MEMBRES
              Private _evtAdapter As Object ' com.sun.star.document.XDocumentEventBroadcaster

              ' PROPERTIES
              Private Property Get FileName As String
                  ''' nom de fitxer depenent del sistema '''
                  Const _LIBRARY = "Tools" : With GlobalScope.BasicLibraries
                      If Not .IsLibraryLoaded(_LIBRARY) Then .LoadLibrary(_LIBRARY)
                  End With
                  Filename = Tools.Strings.FilenameOutofPath(ThisComponent.URL)
              End Property ' controller.ConsoleLogger.Filename

              ' MÈTODES
              Private Sub _documentEventOccured(evt As com.sun.star.document.DocumentEvent)
                  ''' Monitor document events '''
                  Access2Base.Trace.TraceLog("DEBUG", _
                      evt.EventName &" in "& Filename(evt.Source.URL), _
                      UI_NOPROMPT)
                  Select Case evt.EventName
                      Case "OnUnload" : _Stop(evt)
                  End Select
              End Sub ' controller.ConsoleLogger._documentEventOccured

              Private Sub _disposing(evt As com.sun.star.lang.EventObject)
              End Sub ' controller.ConsoleLogger.disposing

              Public Sub Start(Optional evt As com.sun.star.document.DocumentEvent)
                  ''' Initialize document events logging '''
                  Const _LIBRARY = "Access2Base" : With GlobalScope.BasicLibraries
                      If Not .IsLibraryLoaded(_LIBRARY) Then .LoadLibrary(_LIBRARY)
                  End With : Access2Base.Trace.TraceLevel("DEBUG")
                  Access2Base.Trace.TraceLog("INFO", _
                      IIf(IsMissing(evt),"",evt.EventName & "-") & "Document events are being logged", _
                      UI_PROMPT)

                  _evtAdapter = CreateUnoListener( "_", "com.sun.star.document.XDocumentEventListener" )
                  ThisComponent.addDocumentEventListener( _evtAdapter )
              End Sub ' controller.ConsoleLogger.Start

              Private Sub _Stop(Optional evt As com.sun.star.document.DocumentEvent)
                  ''' Terminate document events logging '''
                  ThisComponent.removeDocumentEventListener( _evtAdapter )
                  Access2Base.Trace.TraceLog("INFO", _
                      IIf(IsMissing(evt),"",evt.EventName & "-") & "Document events have been logged", _
                      UI_PROMPT)
                  Access2Base.Trace.TraceConsole() ' Captured events dialog
              End Sub ' controller.ConsoleLogger._Stop

              ' EVENTS
              ' Your code for handled events goes here

Mind the misspelled _documentEventOccured method that inherits a typo from LibreOffice Application Programming Interface (API).

## Discovering Documents Events

The broadcaster API object provides the list of events it is responsible for:

### With Python

             # -*- coding: utf-8 -*-
             from __future__ import unicode_literals

             import uno, apso_utils as ui

             def displayAvailableEvents():
                 """ Display document events """
                 '''
                 adapted from DisplayAvailableEvents() by A. Pitonyak
                 https://forum.openoffice.org/en/forum/viewtopic.php?&t=43689
                 '''
                 ctx = XSCRIPTCONTEXT.getComponentContext()
                 smgr = ctx.ServiceManager
                 geb = smgr.createInstanceWithContext(
                     "com.sun.star.frame.GlobalEventBroadcaster", ctx)
                 events = geb.Events.getElementNames()
                 ui.msgbox('; '.join(events))

             g_exportedScripts = (displayAvailableEvents,)

The Alternative Python Script Organizer (APSO) extension is used to render events information on screen.

### Amb el LibreOffice Basic

             Sub DisplayAvailableEvents
                 ''' Display document events '''
                 Dim geb As Object ' com.sun.star.frame.GlobalEventBroadcaster
                 Dim events() As String
                 geb = CreateUnoService("com.sun.star.frame.GlobalEventBroadcaster")
                 events = geb.Events.ElementNames()
                 MsgBox Join(events, "; ")
             End Sub

Temes relacionats

Creating Event Listeners

Importing Python Modules

Creating a Dialog Handler

Exemples de programació en Python

Programació amb scripts en Python

Crida a macros bàsiques des de Python