Monitoring Document Events

目录

# 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.

在将宏分配给事件旁边，可以监视 LibreOffice 文档所引发的事件。应用程序编程接口 (API) 广播器负责调用事件脚本。与需要定义所有支持的方法 (即使未使用) 的监听器不同, 文档监视器对已挂钩的事件脚本只需要两个方法。

## 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.

### 使用 Python

事件监视从对象实例化开始, 并在 Python 释放对象时最终停止。引发的事件通过Access2Base 控制台报告。

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):
                 """ 监视文档事件 """
                 '''
                 改编自「用于监视 OnSave 事件的 Python 脚本」，见于
                 https://forum.openoffice.org/en/forum/viewtopic.php?t=68887
                 '''
                 def __init__(self):
                     """ 文档事件监视器 """
                     ''' 使用 Access2Base.Trace 控制台报告，*或*
                     在 Calc 文档的第一个工作表的第一列报告 '''
                     ctx = uno.getComponentContext()
                     smgr = ctx.getServiceManager()
                     desktop = smgr.createInstanceWithContext(
                     'com.sun.star.frame.Desktop' , ctx)
                     self.doc = desktop.CurrentComponent
                     #self.row = 0  # 仅对 Calc 文档取消注释
                     Console.setLevel("DEBUG")
                     self.listen()  # 开始监视文档事件

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

                 def setCell(self, calcDoc, txt: str):
                     """ 在 Calc 电子表格的第一列输出文档事件 """
                     sheet = calcDoc.getSheets().getByIndex(0)
                     sheet.getCellByPosition(0,self.row).setString(txt)
                     self.row = self.row + 1

                 def listen(self, *args):  # 尽可能早执行 OnLoad/OnNew
                     """ 开始文档事件监视 """
                     self.doc.addDocumentEventListener(self)
                     Console.log("INFO", "正在记录文档事件", True)

                 def sleep(self, *args):  # 最后执行 OnUnload (可选)
                     """ 停止文档事件监视 """
                     self.doc.removeDocumentEventListener(self)
                     Console.log("INFO", "文档事件已记录", True)

                 def documentEventOccured(self, event: DocumentEvent):
                     """ 截取所有文档事件 """
                     #self.setCell(event.Source, event.EventName) # 仅适用于 Calc 文档
                     Console.log("DEBUG",
                         event.EventName+" in "+self.Filename,
                         False)

                 def disposing(self, event: EventObject):
                     """ 释放所有活动 """
                     self.sleep()
                     Console.show()

             def OnLoad(*args):  #「文档打开」事件
                 listener = UiDocument()  # Initiates listening

             def OnUnload(*args):  # '文档已关闭' 事件
                 pass  # (可选) 销毁时执行

             g_exportedScripts = (OnLoad,)

             from com.sun.star.script.provider import XScript
             class Console():
                 """
                 用于报告/记录程序执行的后台/前台控制台。
                 """
                 @staticmethod
                 def trace(*args,**kwargs):
                     """ 向控制台打印空闲项目列表 """
                     scr = Console._a2bScript(script='DebugPrint', module='Compatible')
                     scr.invoke((args),(),())
                 @staticmethod
                 def log(level: str, text: str, msgBox=False):
                     """ 日志消息追加到控制台，可选用户提示 """
                     scr = Console._a2bScript(script='TraceLog')
                     scr.invoke((level,text,msgBox),(),())
                 @staticmethod
                 def setLevel(logLevel: str):
                     """ 设置日志消息下限 """
                     scr = Console._a2bScript(script='TraceLevel')
                     scr.invoke((logLevel,),(),())
                 @staticmethod
                 def show():
                     """ 显示控制台内容/对话框 """
                     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

注意拼写错误的 documentEventOccured 方法, 该错误继承自 LibreOffice 应用程序编程接口 (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.

### 使用 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) ' >> 文档打开 <<
                _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

              ' 成员
              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
                  ''' 受系统影响的文件名 '''
                  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

              ' 方法
              Public Sub DocumentEventOccurs(evt As com.sun.star.document.DocumentEvent)
                  ''' 监视文档事件 '''
                  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)
                  ''' 初始化文档事件记录 '''
                  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)
                  ''' 终止文档事件记录 '''
                  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
              ' 用于已处理事件的代码放在这里

注意拼写错误的 _documentEventOccured 方法, 该错误继承自 LibreOffice 应用程序编程接口 (API)。

## 探索文档事件

广播器 API 对象提供了它所负责的事件列表:

### 使用 Python

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

             import uno, apso_utils as ui

             def displayAvailableEvents():
                 """ 显示文档事件 """
                 '''
                 改编自 DisplayAvailableEvents()，作者为 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,)

「替代 Python 脚本管理器 (APSO)」扩展程序用于在屏幕上渲染事件信息。

### 使用 LibreOffice Basic

             Sub DisplayAvailableEvents
                 ''' 显示文档事件 '''
                 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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