将变量传递到槽中- QSignalMapper

Question

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我正在尝试使用相同的图片上传功能来上传这两张图片。

因此，在单击Upload按钮时，我需要将self.UploadStudentPhoto或self.UploadParentsPhoto传递给self.UploadFile()函数，对应于按下的按钮。

由于我们不能将变量传递到插槽中，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)

但是我不确定下面这行我需要将信号(“mapped()”)传递给我为上传文件而编写的函数。下面这行我该怎么写：

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，但我不确定变量是如何传递的。请提个建议。

Answer 1

实际上，通过使用python中的partial模块，它可以将一个变量传递给connect和SLOT；

就我的观点而言，我建议使用'simple‘(我认为)来实现，我将在下面的代码中向你展示；

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()
.
.
.

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

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

致以敬意，