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# Listening to Document Events

Escuchar los eventos del documento puede ser útil en situaciones como las siguientes:

- Identify a new document at opening time, as opposed to existing ones, and perform a dedicated setup.

- Control the processing of document save, document copy, print or mailmerge requests.

- Recalculate table of contents, indexes or table entries of a Writer document when document is going to be closed

- Import math Python packages before opening a Calc document. Release these packages when the document closes.

Además de asignar macros a eventos, es posible monitorizar los eventos emitidos por los documentos de LibreOffice. Los emisores de API (interfaz de programación de aplicaciones, por sus siglas en inglés) son responsables de llamar a las macros de los eventos. A diferencia de los agentes de escucha que requieren que se definan todos los métodos admitidos incluso si estos no se utilizan, los monitores de documento únicamente requieren dos métodos junto a macros de eventos conectadas.

## Monitorización de los eventos del documento

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.

### Con Python

Events monitoring starts from object instantiation and ultimately stops when Python releases the object. Raised events are reported using Access2Base console.

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):
                 """ Monitor de eventos del documento """
                 '''
                 adaptado de «secuencia de órdenes Python para monitorizar el evento OnSave» en
                 https://forum.openoffice.org/en/forum/viewtopic.php?t=68887
                 '''
                 def __init__(self):
                     """ Monitor de eventos del documento """
                     ''' crear informe con la consola Access2Base.Trace O
                     informe en 1.ª hoja, 1.ª columna para documentos de Calc '''
                     ctx = uno.getComponentContext()
                     smgr = ctx.getServiceManager()
                     desktop = smgr.createInstanceWithContext(
                     'com.sun.star.frame.Desktop' , ctx)
                     self.doc = desktop.CurrentComponent
                     #self.row = 0  # descomentarice solo en documentos de Calc
                     Console.setLevel("DEBUG")
                     self.listen()  # Inicia seguimiento de eventos del documento

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

                 def setCell(self, calcDoc, txt: str):
                     """ Output doc. events on 1st column of a Calc spreadsheet """
                     sheet = calcDoc.getSheets().getByIndex(0)
                     sheet.getCellByPosition(0,self.row).setString(txt)
                     self.row = self.row + 1

                 def listen(self, *args):  # OnLoad/OnNew at the earliest
                     """ Start doc. events monitoring """
                     self.doc.addDocumentEventListener(self)
                     Console.log("INFO", "Document events are being logged", True)

                 def sleep(self, *args):  # OnUnload at the latest (optional)
                     """ Stop doc. events monitoring """
                     self.doc.removeDocumentEventListener(self)
                     Console.log("INFO", "Se han registrado los eventos del documento", True)

                 def documentEventOccured(self, event: DocumentEvent):
                     """ Intercepta todos los eventos del documento """
                     #self.setCell(event.Source, event.EventName) # solo para documentos Calc
                     Console.log("DEBUG",
                         event.EventName+" in "+self.Filename,
                         False)

                 def disposing(self, event: EventObject):
                     """ Release all activities """
                     self.sleep()
                     Console.show()

             def OnLoad(*args):  # Evento «Abrir documento»
                 listener = UiDocument()  # Inicia la escucha

             def OnUnload(*args):  # 'Document has been closed' event
                 pass  # (optional) performed when disposed

             g_exportedScripts = (OnLoad,)

             from com.sun.star.script.provider import XScript
             class Console():
                 """
                 Puesta en primer o segundo plano de la consola para registrar la ejecución del programa.
                 """
                 @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

Preste atención al error ortográfico en el método documentEventOccured, que proviene de la interfaz de programación de aplicaciones (API, por sus siglas en inglés) de 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.

### Con LibreOffice Basic

Using Tools - Customize menu Events tab, the Open document event fires a ConsoleLogger initialisation. _documentEventOccured routine - set by ConsoleLogger - serves as a unique entry point to trap all document events.

#### Módulo controller.Events

            Option Explicit

            Global _obj As Object ' controller.ConsoleLogger instance

            Sub OnLoad(evt As com.sun.star.document.DocumentEvent) ' >> Open Document <<
                _obj = New ConsoleLogger : _obj.StartAdapter(evt)
            End Sub ' controller.OnLoad
            Sub _documentEventOccured(evt As com.sun.star.document.DocumentEvent)
                ''' ConsoleLogger unique entry point '''
                 _obj.DocumentEventOccurs(evt)
            End Sub ' controller._documentEventOccured

#### controller.ConsoleLogger class module

Events monitoring starts from the moment a ConsoleLogger object is instantiated and ultimately stops upon document closure. StartAdapter routine loads necessary Basic libraries, while caught events are reported using Access2Base.Trace 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

              ' MIEMBROS
              Private _evtAdapter As Object ' com.sun.star.document.XDocumentEventBroadcaster
              Private _txtMsg As String ' mensaje de texto que registrar en la consola

              ' PROPIEDADES
              Private Property Get FileName As String
                  ''' nombre de archivo dependiente 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

              ' MÉTODOS
              Public Sub DocumentEventOccurs(evt As com.sun.star.document.DocumentEvent)
                  ''' Monitorizar eventos de documento '''
                  Access2Base.Trace.TraceLog("DEBUG", _
                      evt.EventName &" in "& Filename(evt.Source.URL), _
                      UI_NOPROMPT)
                  Select Case evt.EventName
                      Case "OnUnload" : _StopAdapter(evt)
                  End Select
              End Sub ' controller.ConsoleLogger.DocumentEventOccurs

              Public Sub StartAdapter(Optional evt As com.sun.star.document.DocumentEvent)
                  ''' Iniciar registro de eventos de documento '''
                  Const _LIBRARY = "Access2Base" : With GlobalScope.BasicLibraries
                      If Not .IsLibraryLoaded(_LIBRARY) Then .LoadLibrary(_LIBRARY)
                  End With : Access2Base.Trace.TraceLevel("DEBUG")
                  If IsMissing(evt) Then _txtMsg = "" Else _txtMsg = evt.EventName & "-"
                  Access2Base.Trace.TraceLog("INFO", _txtMsg & "Document events are being logged", UI_PROMPT)
                  _evtAdapter = CreateUnoListener( "_", "com.sun.star.document.XDocumentEventListener" )
                  ThisComponent.addDocumentEventListener( _evtAdapter )
              End Sub ' controller.ConsoleLogger.StartAdapter

              Private Sub _StopAdapter(Optional evt As com.sun.star.document.DocumentEvent)
                  ''' Terminate document events logging '''
                  ThisComponent.removeDocumentEventListener( _evtAdapter )
                  If IsMissing(evt) Then _txtMsg = "" Else _txtMsg = evt.EventName & "-"
                  Access2Base.Trace.TraceLog("INFO", _txtMsg & "Document events have been logged", UI_PROMPT)
                  Access2Base.Trace.TraceConsole() ' Diálogo con los eventos capturados
              End Sub ' controller.ConsoleLogger._StopAdapter

              ' EVENTOS
              ' Su código para la gestión de eventos va aquí

Preste atención al error ortográfico en el método _documentEventOccured, que proviene de la interfaz de programación de aplicaciones (API, por sus siglas en inglés) de LibreOffice.

## Descubrimiento de eventos de documento

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

### Con Python

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

             import uno, apso_utils as ui

             def displayAvailableEvents():
                 """ Mostrar eventos del documento """
                 '''
                 adaptado de DisplayAvailableEvents() por 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.

### Con LibreOffice Basic

             Sub DisplayAvailableEvents
                 ''' Mostrar eventos del documento '''
                 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

Temas relacionados

Creating Event Listeners

Importar módulos de Python

Creating a Dialog Handler

Ejemplos de programación en Python

Programar con secuencias de órdenes en Python

Llamar macros en Basic desde Python