pyqt qfiledialog自定义代理过滤器不起作用

Question

此工作代码提出qfiledialog，提示用户选择.csv文件：

def load(self,fileName=None):
        if not fileName:
            fileName=fileDialog.getOpenFileName(caption="Load Existing Radio Log",filter="csv (*.csv)")[0]
  ...
  ...

现在，我想更改该过滤器以更具选择性。该程序将每个项目保存为三个.csv文件(project.csv，project_fleetsync.csv，project_cluelog.csv(，但我只希望"文件"对话框显示第一个(project.csv(，以避免显示用户当只有三分之一可以通过LOAD((函数来处理其中的三分之一时，都有太多选择。

根据这篇文章，看起来解决方案是使用代理模型。因此，我将代码更改为以下(LOAD((中的所有注释行((都是我在各种组合中尝试的事情(：

def load(self,fileName=None):
    if not fileName:
        fileDialog=QFileDialog()
        fileDialog.setProxyModel(CSVFileSortFilterProxyModel(self))
#           fileDialog.setNameFilter("CSV (*.csv)")
#           fileDialog.setOption(QFileDialog.DontUseNativeDialog)
#           fileName=fileDialog.getOpenFileName(caption="Load Existing Radio Log",filter="csv (*.csv)")[0]
#           fileName=fileDialog.getOpenFileName(caption="Load Existing Radio Log")[0]
#           fileDialog.exec_()
...
...
# code for CSVFileSortFilterProxyModel partially taken from
#  https://github.com/ZhuangLab/storm-control/blob/master/steve/qtRegexFileDialog.py
class CSVFileSortFilterProxyModel(QSortFilterProxyModel):
    def __init__(self,parent=None):
        print("initializing CSVFileSortFilterProxyModel")
        super(CSVFileSortFilterProxyModel,self).__init__(parent)
    # filterAcceptsRow - return True if row should be included in the model, False otherwise
    #
    # do not list files named *_fleetsync.csv or *_clueLog.csv
    #  do a case-insensitive comparison just in case
    def filterAcceptsRow(self,source_row,source_parent):
        print("CSV filterAcceptsRow called")
        source_model=self.sourceModel()
        index0=source_model.index(source_row,0,source_parent)
        # Always show directories
        if source_model.isDir(index0):
            return True
        # filter files
        filename=source_model.fileName(index0)
#       filename=self.sourceModel().index(row,0,parent).data().lower()
        print("testing lowercased filename:"+filename)
        if filename.count("_fleetsync.csv")+filename.count("_clueLog.csv")==0:
            return True
        else:
            return False

文件仍在对话框中列出。显然我在做错事...

Answer 1

在此处的另一个stackoverflow问题上找到了解决方案。

来自该解决方案：

主要要注意的是致电 对话框。 Dialog.setproxymodel。

也看起来您必须使用filedialog.exec_((而不是filedialog.getopenfilename。您设置为setNameFilter的值确实显示在非本地对话框的滤波器循环字段中，但实际上仅用于装饰，因为接头滤波器过滤器覆盖了它。我认为这是一件好事

感谢用户Frank和Ariwez。

更新：要澄清，这是我正在使用的完整最终代码：

def load(self,fileName=None):
    if not fileName:
        fileDialog=QFileDialog()
        fileDialog.setOption(QFileDialog.DontUseNativeDialog)
        fileDialog.setProxyModel(CSVFileSortFilterProxyModel(self))
        fileDialog.setNameFilter("CSV Radio Log Data Files (*.csv)")
        fileDialog.setDirectory(self.firstWorkingDir)
        if fileDialog.exec_():
            fileName=fileDialog.selectedFiles()[0]
        else: # user pressed cancel on the file browser dialog
            return
... (the rest of the load function processes the selected file)
...

# code for CSVFileSortFilterProxyModel partially taken from
#  https://github.com/ZhuangLab/storm-control/blob/master/steve/qtRegexFileDialog.py
class CSVFileSortFilterProxyModel(QSortFilterProxyModel):
    def __init__(self,parent=None):
#       print("initializing CSVFileSortFilterProxyModel")
        super(CSVFileSortFilterProxyModel,self).__init__(parent)
    # filterAcceptsRow - return True if row should be included in the model, False otherwise
    #
    # do not list files named *_fleetsync.csv or *_clueLog.csv
    #  do a case-insensitive comparison just in case
    def filterAcceptsRow(self,source_row,source_parent):
#       print("CSV filterAcceptsRow called")
        source_model=self.sourceModel()
        index0=source_model.index(source_row,0,source_parent)
        # Always show directories
        if source_model.isDir(index0):
            return True
        # filter files
        filename=source_model.fileName(index0).lower()
#       print("testing lowercased filename:"+filename)
        # never show non- .csv files
        if filename.count(".csv")<1:
            return False
        if filename.count("_fleetsync.csv")+filename.count("_cluelog.csv")==0:
            return True
        else:
            return False