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# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from enum import Enum, auto
from PySide6.QtCore import QFileInfo, QObject, QSettings, Signal, Slot
DEFAULT_MAX_FILES = 10
# Test if file exists and can be opened
def testFileAccess(fileName):
return QFileInfo(fileName).isReadable()
class RemoveReason(Enum):
Other = auto()
Duplicate = auto()
class EmitPolicy(Enum):
EmitWhenChanged = auto(),
NeverEmit = auto()
s_maxFiles = "maxFiles"
s_openMode = "openMode"
s_fileNames = "fileNames"
s_file = "file"
class RecentFiles(QObject):
countChanged = Signal(int)
changed = Signal()
def __init__(self, parent=None):
super().__init__(parent)
self._maxFiles = DEFAULT_MAX_FILES
self._files = []
# Access to QStringList member functions
def recentFiles(self):
return self._files
def isEmpty(self):
return not self._files
# Properties
def maxFiles(self):
return self._maxFiles
def setMaxFiles(self, maxFiles):
self._maxFiles = maxFiles
def addFile(self, fileName):
self._addFile(fileName, EmitPolicy.EmitWhenChanged)
def removeFile(self, fileName):
idx = self._files.find(fileName)
self._removeFile(idx, RemoveReason.Other)
@Slot()
def clear(self):
if self.isEmpty():
return
self._files.clear()
self.countChanged.emit(0)
def _addFile(self, fileName, policy):
if not testFileAccess(fileName):
return
# Remember size, as cleanup can result in a change without size change
c = len(self._files)
# Clean dangling and duplicate files
i = 0
while i < len(self._files):
file = self._files[i]
if not testFileAccess(file):
self._removeFile(file, RemoveReason.Other)
elif file == fileName:
self._removeFile(file, RemoveReason.Duplicate)
else:
i += 1
# Cut tail
while len(self._files) > self._maxFiles:
self.removeFile((len(self._files) - 1), RemoveReason.Other)
self._files.insert(0, fileName)
if policy == EmitPolicy.NeverEmit:
return
if policy == EmitPolicy.EmitWhenChanged:
self.changed.emit()
if c != len(self._files):
self.countChanged.emit(len(self._files))
@Slot(list)
def addFiles(self, files):
if files.isEmpty():
return
if len(files) == 1:
self.addFile(files[0])
return
c = len(self._files)
for file in files:
self.addFile(file, EmitPolicy.NeverEmit)
self.changed.emit()
if len(self._files) != c:
self.countChanged.emit(len(self._files))
def _removeFile(self, p, reason):
index = p
if isinstance(p, str):
index = self._files.index(p) if p in self._files else -1
if index < 0 or index >= len(self._files):
return
del self._files[index]
# No emit for duplicate removal, add emits changed later.
if reason != RemoveReason.Duplicate:
self.changed.emit()
@Slot(QSettings, str)
def saveSettings(self, settings, key):
settings.beginGroup(key)
settings.setValue(s_maxFiles, self.maxFiles())
if self._files:
settings.beginWriteArray(s_fileNames, len(self._files))
for index, file in enumerate(self._files):
settings.setArrayIndex(index)
settings.setValue(s_file, file)
settings.endArray()
settings.endGroup()
@Slot(QSettings, str)
def restoreFromSettings(self, settings, key):
settings.beginGroup(key)
self.setMaxFiles(settings.value(s_maxFiles, DEFAULT_MAX_FILES, int))
self._files.clear() # clear list without emitting
numberFiles = settings.beginReadArray(s_fileNames)
for index in range(0, numberFiles):
settings.setArrayIndex(index)
absoluteFilePath = settings.value(s_file)
self._addFile(absoluteFilePath, EmitPolicy.NeverEmit)
settings.endArray()
settings.endGroup()
if self._files:
self.changed.emit()
return True
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