Monitoring Document Events

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# Listening to Document Events

Listening to document events can help in the following situations:

- 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.

Além de atribuir macros a eventos, você pode monitorizar eventos criados por documentos do LibreOffice. Os difusores da API (Application Programming Interface) são responsáveis pelas chamadas a macros de eventos. Diferente dos recetores que requerem a definição de todos os métodos suportados, mesmo que não utilizados, a monitorização de documentos requer somente dois métodos além dos scripts de eventos relacionados.

## Monitoring Document Events

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.

### Com Python

A monitorização de eventos começa da instanciação do objeto, e termina quando o Python liberta o objeto. Os eventos criados são reportados ao utilizar a consola do 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):
                 """ Monitorizar eventos de documento """
                 '''
                 adaptado de 'Python script to monitor OnSave event' de
                 https://forum.openoffice.org/en/forum/viewtopic.php?t=68887
                 '''
                 def __init__(self):
                     """ Monitorizar eventos de documento """
                     ''' reportar utilizando a consola Access2Base.Trace OU
                     reportar na 1.ª folha, 1.ª coluna para documentos do Calc '''
                     ctx = uno.getComponentContext()
                     smgr = ctx.getServiceManager()
                     desktop = smgr.createInstanceWithContext(
                     'com.sun.star.frame.Desktop' , ctx)
                     self.doc = desktop.CurrentComponent
                     #self.row = 0  # remover comentário apenas em documentos do Calc
                     Console.setLevel("DEBUG")
                     self.listen()  # Começar a monitorizar eventos de 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):
                     """ Saída dos eventos de doc. na 1.ª coluna de uma folha Calc """
                     sheet = calcDoc.getSheets().getByIndex(0)
                     sheet.getCellByPosition(0,self.row).setString(txt)
                     self.row = self.row + 1

                 def listen(self, *args):  # OnLoad/OnNew o mais cedo
                     """ Começar monitorização de eventos de documento """
                     self.doc.addDocumentEventListener(self)
                     Console.log("INFO", "Os eventos de documento estão a ser registados", True)

                 def sleep(self, *args):  # OnUnload por último (opcional)
                     """ Encerrar monitorização de eventos de documento """
                     self.doc.removeDocumentEventListener(self)
                     Console.log("INFO", "Os eventos de documento foram registados", True)

                 def documentEventOccured(self, event: DocumentEvent):
                     """ Intercetar todos os eventos de documento """
                     #self.setCell(event.Source, event.EventName) # apenas em documentos do Calc
                     Console.log("DEBUG",
                         event.EventName+" in "+self.Filename,
                         False)

                 def disposing(self, event: EventObject):
                     """ Libertar todas as atividades """
                     self.sleep()
                     Console.show()

             def OnLoad(*args):  # evento 'Abrir documento'
                 listener = UiDocument()  # Initiates listening

             def OnUnload(*args):  # evento 'Documento foi fechado'
                 pass  # (opcional) executado quando dispensado

             g_exportedScripts = (OnLoad,)

             from com.sun.star.script.provider import XScript
             class Console():
                 """
                 Consola para trás ou para a frente para reportar/registar execução de programa.
                 """
                 @staticmethod
                 def trace(*args,**kwargs):
                     """ Imprimir lista de itens livre na consola """
                     scr = Console._a2bScript(script='DebugPrint', module='Compatible')
                     scr.invoke((args),(),())
                 @staticmethod
                 def log(level: str, text: str, msgBox=False):
                     """ Anexar mensagem de registo na consola, pergunta opcional ao utilizador """
                     scr = Console._a2bScript(script='TraceLog')
                     scr.invoke((level,text,msgBox),(),())
                 @staticmethod
                 def setLevel(logLevel: str):
                     """ Definir limite inferior em mensagens de registo """
                     scr = Console._a2bScript(script='TraceLevel')
                     scr.invoke((logLevel,),(),())
                 @staticmethod
                 def show():
                     """ Exibir o conteúdo ou diálogo da consola """
                     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 atenção ao erro no método documentEventOccured que herda um erro da LibreOffice Application Programming Interface (API).

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.

### Com 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.

#### controller.Events module

            Option Explicit

            Global _obj As Object ' controller.ConsoleLogger instance

            Sub OnLoad(evt As com.sun.star.document.DocumentEvent) ' >> Abrir documento <<
                _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

              ' MEMBERS
              Private _evtAdapter As Object ' com.sun.star.document.XDocumentEventBroadcaster
              Private _txtMsg As String ' text message to log in console

              ' PROPERTIES
              Private Property Get FileName As String
                  ''' Nome de ficheiro dependente do 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

              ' METHODS
              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)
                  ''' Inicializar registo 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)
                  ''' Terminar registo de eventos de documento '''
                  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() ' Captured events dialog
              End Sub ' controller.ConsoleLogger._StopAdapter

              ' EVENTS
              ' O seu código para tratar eventos segue aqui

Preste atenção ao erro no método _documentEventOccured que herda um erro ortográfico da LibreOffice Application Programming Interface (API).

## Descobrir eventos de documento

O objeto API emissor fornece a lista de eventos dos quais é responsável:

### Com Python

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

             import uno, apso_utils as ui

             def displayAvailableEvents():
                 """ Exibir eventos de 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,)

A extensão Alternative Python Script Organizer (APSO) é utilizada para mostrar informações de eventos no ecrã.

### Com LibreOffice Basic

             Sub DisplayAvailableEvents
                 ''' Exibir eventos de 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

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