将变量传递给SLOT - QSignalMapper

Question

我正在尝试为图片上传使用相同的图片上传功能。

所以点击“上传”按钮，我需要将self.UploadStudentPhoto或self.UploadParentsPhoto传递给self.UploadFile（）函数，对应按下的按钮。

由于我们无法将变量传递给SLOT，所以我尝试使用QSignalMapper，如下所示。

self.UploadStudentPhoto = QLineEdit() #Student Photo location
self.UploadParentsPhoto = QLineEdit() #Parents Photo location
self.ParentsImage = None

self.SignalMapper = QSignalMapper()
self.connect(self.ButtonUpload1,SIGNAL("clicked()"),self.SignalMapper, SLOT("map()"))
self.connect(self.ButtonUpload2,SIGNAL("clicked()"),self.SignalMapper,SLOT("map()"))

self.SignalMapper.setMapping(self.ButtonUpload1, self.UploadStudentPhoto)
self.SignalMapper.setMapping(self.ButtonUpload2, self.UploadParentsPhoto)

但我不确定下面的行，我需要将SIGNAL（“mapped（）”）传递给我为文件上传编写的函数。我应该如何写下面一行：

self.connect(self.SignalMapper,SIGNAL("mapped()"), self, self.UploadFile)

上传文件功能如下：

def UploadFile(self, ImagePath, ImageLabel):
    dir = os.path.dirname(".")
    formats = ["*.%s" % unicode(format).lower()\
        for format in QImageReader.supportedImageFormats()]
    self.fname = unicode(QFileDialog.getOpenFileName(self,"Image",dir,"Image (%s)" % " ".join(formats)))
    print self.fname
    ImagePath.setText(self.fname)
    ImagePath.selectAll()
    ImageLabel = QImage()
    ImageLabel.setPixmap(QPixmap.fromImage(ImageLabel))

我看到了许多QSignalMapper示例，但我不确定该变量的确切传递方式。 请建议。

Answer 1

实际上，它可以将变量传递给connect＆amp; SLOT，在python中使用partial模块;

对于我的观点，我建议使用“简单”（我认为）来实现，我将在下面的代码中向您展示;

from functools import partial
.
.
.
        self.StudentPhoto = QLabel() # I know you have this.
        self.ParentsPhoto = QLabel() # I know you have this too.
        self.UploadStudentPhoto = QLineEdit()
        self.UploadParentsPhoto = QLineEdit()
        self.connect(self.ButtonUpload1, SIGNAL("clicked()"), partial(self.UploadFile, self.UploadStudentPhoto, self.StudentPhoto))
        self.connect(self.ButtonUpload2, SIGNAL("clicked()"), partial(self.UploadFile, self.UploadParentsPhoto, self.ParentsPhoto))
.
.
.
    def UploadFile(self, ImagePath, ImageLabel):
        dir = os.path.dirname(".")
        formats = ["*.%s" % unicode(format).lower()\
            for format in QImageReader.supportedImageFormats()]
        self.fname = unicode(QFileDialog.getOpenFileName(self,"Image",dir,"Image (%s)" % " ".join(formats)))
        print self.fname
        ImagePath.setText(self.fname)
        ImagePath.selectAll()
.
.
.

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示例参考：http://www.learnpython.org/en/Partial_functions

官方参考：https://docs.python.org/2/library/functools.html

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此致