使用PyQt5使QLabel可点击

问题描述

我有一个用QPixmap填充的Qlabel，单击此标签后，我想启动一个进程/功能。我对QLabel类进行了如下扩展：

I have a Qlabel filled with QPixmap and I want to start a process/function once this label clicked. I had extended QLabel class as follows:

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *

class QLabel_alterada(QLabel):
  clicked=pyqtSignal()
  def __init(self, parent):
    QLabel.__init__(self, QMouseEvent)

  def mousePressEvent(self, ev):
    self.clicked.emit()

然后，在基于pyuic5的.py文件（我使用QtDesigner进行布局）中，将模块导入到我保存扩展的QLabel类的模块中，并在自动生成的setupui函数内部更改了我的标签

Then, in my pyuic5-based .py file (I used QtDesigner to do the layout) after importing the module where I save the extended QLabel class,inside the automatically generated setupui, function I changed my Label from

self.label1=QtWidgets.QLabel(self.centralwidget)

到

self.label1 = QLABEL2.QLabel_alterada(self.centralwidget)

最后，在核心应用python文件中，我将所有程序/我添加的应用程序功能所需要的所有类

Finally, in the core app python file where I put all the procedures/classes whetever needed to the application functionality I added

self.ui.label1.clicked.connect(self.dosomestuff)

应用程序不会崩溃，但标签仍然不可单击。有人可以帮我这个忙吗？

The application does not crashes but the labels still not clickable. Can someone give me some help on this?

预先感谢

推荐答案

我不明白为什么要将QMouseEvent传递给父构造函数，必须按如下所示传递parent属性：

I do not understand why you pass QMouseEvent to the parent constructor, you must pass the parent attribute as shown below:

class QLabel_alterada(QLabel):
    clicked=pyqtSignal()
    def __init__(self, parent=None):
        QLabel.__init__(self, parent)

    def mousePressEvent(self, ev):
        self.clicked.emit()

为避免出现问题导入后，我们可以直接促销小部件，如下所示：

To avoid having problems with imports we can directly promote the widget as shown below:

我们放置 QLabel 并右键单击并选择升级到... ：

We place a QLabel and right click and choose Promote to ...:

我们得到以下对话框，并将 QLABEL2.h 放在头文件和 QL中升级类名称中的abel_changed ，然后按添加并升级

We get the following dialog and place the QLABEL2.h in header file and QLabel_changed in Promoted class Name, then press Add and Promote

然后我们在pyuic的帮助下生成.ui文件。获得以下结构：

Then we generate the .ui file with the help of pyuic. Obtaining the following structure:

├── main.py
├── QLABEL2.py
└── Ui_main.ui

获得以下结构：

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        QtWidgets.QMainWindow.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.label.clicked.connect(self.dosomestuff)

    def dosomestuff(self):
        print("click")


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

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