Mercurial Repositories > eric / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/eric6/WebBrowser/Tools/DelayedFileWatcher.py	Sun Apr 14 15:09:21 2019 +0200
@@ -0,0 +1,80 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2016 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing a file system watcher with a delay.
+"""
+
+from __future__ import unicode_literals
+
+from PyQt5.QtCore import pyqtSignal, pyqtSlot, QFileSystemWatcher, QTimer
+
+
+class DelayedFileWatcher(QFileSystemWatcher):
+    """
+    Class implementing a file system watcher with a delay.
+    
+    @signal delayedDirectoryChanged(path) emitted to indicate a changed
+        directory
+    @signal delayedFileChanged(path) emitted to indicate a changed file
+    """
+    delayedDirectoryChanged = pyqtSignal(str)
+    delayedFileChanged = pyqtSignal(str)
+    
+    def __init__(self, paths=None, parent=None):
+        """
+        Constructor
+        
+        @param paths list of paths to be watched
+        @type list of str
+        @param parent reference to the parent object
+        @type QObject
+        """
+        if paths:
+            super(DelayedFileWatcher, self).__init__(paths, parent)
+        else:
+            super(DelayedFileWatcher, self).__init__(parent)
+        
+        self.__dirQueue = []
+        self.__fileQueue = []
+        
+        self.directoryChanged.connect(self.__directoryChanged)
+        self.fileChanged.connect(self.__fileChanged)
+    
+    @pyqtSlot(str)
+    def __directoryChanged(self, path):
+        """
+        Private slot handling a changed directory.
+        
+        @param path name of the changed directory
+        @type str
+        """
+        self.__dirQueue.append(path)
+        QTimer.singleShot(500, self.__dequeueDirectory)
+    
+    @pyqtSlot(str)
+    def __fileChanged(self, path):
+        """
+        Private slot handling a changed file.
+        
+        @param path name of the changed file
+        @type str
+        """
+        self.__fileQueue.append(path)
+        QTimer.singleShot(500, self.__dequeueFile)
+    
+    @pyqtSlot()
+    def __dequeueDirectory(self):
+        """
+        Private slot to signal a directory change.
+        """
+        self.delayedDirectoryChanged.emit(self.__dirQueue.pop(0))
+    
+    @pyqtSlot()
+    def __dequeueFile(self):
+        """
+        Private slot to signal a file change.
+        """
+        self.delayedFileChanged.emit(self.__fileQueue.pop(0))