Python : Document Gebeurtenissen Volgen

Inhoud
Index 🔎︎

# Documentgebeurtenissen

Next to assigning macros to events, one can monitor events raised by LibreOffice documents. Application Programming Interface (API) broadcasters are responsible for calling event scripts. Unlike listeners that require to define all supported methods, even if unused, document monitors require only two methods next to hooked event scripts.

## Luisteren naar Document Gebeurtenissen

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 – Customise... menu Events tab is used to assign either scripts.

Het onderscheppen van gebeurtenissen helpt het instellen van pre- en post-condities, zoals het laden en lossen van bibliotheken of het volgen van de voortgang van een script in de achtergrond. Het gebruik van Access2Base Trace module is weergegeven in die tweede context.

### Met 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):
                 """ Volg gebeurtenissen van document """
                 '''
                 aangepast van 'Python-script om OnSave-gebeurtenis te controleren' op
                 https://forum.openoffice.org/en/forum/viewtopic.php?t=68887
                 '''
                 def __init__(self):
                     """ Documentgebeurtenissen controleren """
                     "" Rapporteer via Access2Base. Traceer console OR
                     rapport in 1e blad, 1e kolom voor Calc-documenten '' '
                     ctx = uno.getComponentContext()
                     smgr = ctx.getServiceManager()
                     desktop = smgr.createInstanceWithContext(
                     'com.sun.star.frame.Desktop' , ctx)
                     self.doc = desktop.CurrentComponent
                     #self.row = 0  # uncomment alleen voor Calc-documenten
                     Console.setLevel("DEBUG")
                     self.listen()  # Start het volgen van doc. gebeurtenissen

                 @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 op z'n vroegst
                     """ Start het volgen van doc. gebeurtenissen """
                     self.doc.addDocumentEventListener(self)
                     Console.log("INFO", "Document gebeurtenissen worden gelogd", True)

                 def sleep(self, *args):  # OnUnload op z'n laatst (optioneel)
                     """ Stop het volgen van doc. gebeurtenissen """
                     self.doc.removeDocumentEventListener(self)
                     Console.log("INFO", "Document gebeurtenissen zijn gelogd", Waar)

                 def documentEventOccured(self, event: DocumentEvent):
                     """ Onderschep alle doc. gebeurtenissen """
                     #self.setCell(event.Source, event.EventName)  # Alleen voor Calc docs
                     Console.log("DEBUG",
                         event.EventName+" in "+self.Filename,
                         False)

                 def disposing(self, event: EventObject):
                     """ Geef alle activiteiten vrij """
                     self.sleep()
                     Console.show()

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

             def OnUnload(*args):  # 'Document is gesloten' gebeurtenis
                 pass  # (optioneel) uitgevoerd bij verwijdering

             g_exportedScripts = (OnLoad,)

             from com.sun.star.script.provider import XScript
             class Console():
                 """
                 (Achter/Voor)grond console om de programma uitvoering te rapporteren/loggen.
                 """
                 @staticmethod
                 def trace(*args,**kwargs):
                     """ Druk vrije items lijst naar console af """
                     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

Let op de fout gespelde _documentEventOccured methode, deze typefout is overgenomen van 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.

### Met LibreOffice Basic.

The Onload script is assigned to Open document event using Tools – Customise... 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 controller.Events module
              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 « 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

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

              ' PROPERTIES
              Private Property Get FileName As String
                  ''' System-dependent filename '''
                  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

              ' METHODES
              Private Sub _documentEventOccured(evt As com.sun.star.document.DocumentEvent)
                  """ Volg gebeurtenissen van document """
                  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

Let op de fout gespelde _documentEventOccured methode, deze typefout is overgenomen van LibreOffice Application Programming Interface (API).

## Documentgebeurtenissen Ontdekken

Het omroep API object bevat de lijst met gebeurtenissen waarvoor het verantwoordelijk is:

### Met Python

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

             import uno, apso_utils as ui

             def displayAvailableEvents():
                 """ Weergeef documentgebeurtenissen """
                 '''
                 aangepast van DisplayAvailableEvents() door 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,)

De Alternatieve Python Script Organizer (APSO) extensie wordt gebruikt om informatie van gebeurtenissen weer te geven op het scherm.

### Met LibreOffice Basic.

             Sub DisplayAvailableEvents
                 "" Geef documentgebeurtenissen weer ""
                 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

Verwante onderwerpen

Maken van gebeurtenis-luisteraars

Python Modules Importeren

Python programmeringsvoorbeelden

Programmeren met Python-scripts