問題描述

我閱讀、測試和理解了很多 Qt 設(shè)計器的 QWidgets 使用示例，這些示例被提升為 PyQt5.盡管如此，我無法為自己處理一個簡單的例子.

I read, test and understand a lot of examples for usage of QWidgets from Qt designer, which are promoted to PyQt5. Nevertheless I am not able to deal with a simple example for my own.

下面我展示了我的代碼，它不起作用并嘗試解釋.

Beneath I show my code, which is not working and try to explain.

在 Qt 設(shè)計器中，我創(chuàng)建了一個簡單的 QMainWindow，命名為標準化的 MainWindow

in Qt desginer i create a simple QMainWindow, named standardized as MainWindow

在我創(chuàng)建單個標簽 QLabel.我將其提升為neuLabel"類并將其命名為 labelqt.帶有 Add 、標題 neulabel.h 和提升的窗口 --> 一切都很好.

Within I create a single label QLabel. This I promote to class "neuLabel" and name it labelqt. The window with, Add , the header neulabel.h and promote --> everything is fine.

我明白，我必須為類 neuLabel 編寫代碼.但是:在哪里做呢?

I understand, that I have to write code for the class neuLabel. But: WHERE to do it?

通過非常簡單的示例，我嘗試了這樣的:

With very simple example I tried it like this:

from PyQt5 import QtWidgets, uic
import sys
uifile_1 = 'testpromote.ui'
form_1, base_1 = uic.loadUiType(uifile_1)
class neuLabel(QLabel, QPixmap):
    def __init__(self,title,pixmap,parent):
    super().__init__(title,parent)
    self.setAcceptDrops(True)
def mousePressEvent(self, e):
    QLabel.mousePressEvent(self, e)
    if e.button() == QtCore.Qt.LeftButton:
        print('press')
class myApp(base_1, form_1):
    def __init__(self):
        super(base_1,self).__init__()
        self.setupUi(self)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = myApp()   #Dialog()
    ex.show()
sys.exit(app.exec_())

錯誤是這樣的

Traceback (most recent call last):
  File "/home/jf/PycharmProjects/myMuhaInp/testpromote.py", line 5, in <module>
    form_1, base_1 = uic.loadUiType(uifile_1)
  File "/usr/lib/python3/dist-packages/PyQt5/uic/__init__.py", line 201, in loadUiType
    exec(code_string.getvalue(), ui_globals)
  File "<string>", line 37, in <module>
ModuleNotFoundError: No module named 'neulabel'

我真的不明白，在哪里對類neulabel進行編碼(我確實嘗試了很多示例.(在沒有示例中，我發(fā)現(xiàn)，是單個QWidget的推廣)

I really don't understand, WHERE to code the class neulabel (and I really tried a lot of examples. (In no example, I found, is the promotion of a single QWidget)

推薦答案

_{在你所有的代碼出現(xiàn)錯誤之前:為什么需要一個繼承自 QLabel 和 QPixmap 的類?我不明白這一點，QLabel 使用 QPixmap(composition)，QLabel is 不是 QPixmap(inherency).}

_{Before all your code has an error: Why do you need a class that inherits from QLabel and QPixmap? I don't see the point, a QLabel uses a QPixmap(composition), a QLabel is not a QPixmap(inherency).}

對于要提升的小部件，它必須具有以下規(guī)則(我在文檔中沒有找到它們):

For a widget to be promoted it must have the following rules (I did not find them in the docs):

• 小部件的構(gòu)造函數(shù)必須有一個參數(shù)，并且必須是父級.

• The constructor of the widget must have a single parameter and must be the parent.

該類不能在使用它的同一文件中，因為它可以創(chuàng)建循環(huán)導入.

The class must not be in the same file where it is used since it can create a circular import.

小部件促銷表單要求提供 2 個數(shù)據(jù):

The widget promotion form asks for 2 data:

1. 提升的類名，必須是類名.
2. 頭文件 必須是類所在文件的位置(在 C++ 中，根據(jù)自定義規(guī)則，文件名與類名相同，但使用小寫字母，但在 python 中不符合).
   
   

1. Promoted class name which must be the name of the class.
2. Header file which must be the location of the file where the class is (in C++ by custom rule the name of the file is the same name of the class but with lowercase letters, but in python it does not comply).
   
   

例如，如果FooClass"被放置為Promoted class name并且a/b/c"或abc"被放置在頭文件中，它將被翻譯到 from abc import Foo 確認這是正確的.

For example if "FooClass" is placed as Promoted class name and "a/b/c" or "a.b.c" is placed in Header file it will be translated to from a.b.c import Foo so verify that this is correct.

示例:

考慮到上述情況，最簡單的實現(xiàn)是創(chuàng)建一個.py，其中要提升的類是:

Considering the above, the simplest implementation is to create a .py where the class to be promoted is:

neulabel.py

from PyQt5 import QtCore, QtWidgets


class NeuLabel(QtWidgets.QLabel):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setAcceptDrops(True)

    def mousePressEvent(self, e):
        super().mousePressEvent(e)
        if e.button() == QtCore.Qt.LeftButton:
            print("press")

然后在.ui中你必須在表格中填寫以下內(nèi)容，按添加"按鈕，然后按推廣"按鈕

Then in the .ui you must fill in the following in the form, press the "Add" button and then the "Promote" button

生成以下 .ui:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="NeuLabel" name="label">
    <property name="geometry">
     <rect>
      <x>120</x>
      <y>160</y>
      <width>251</width>
      <height>191</height>
     </rect>
    </property>
    <property name="text">
     <string>TextLabel</string>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>26</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <customwidgets>
  <customwidget>
   <class>NeuLabel</class>
   <extends>QLabel</extends>
   <header>neulabel</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

然后在主文件中使用:

import os
import sys

from PyQt5 import QtWidgets, uic

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))

uifile_1 = os.path.join(CURRENT_DIR, "testpromote.ui")
form_1, base_1 = uic.loadUiType(uifile_1)


class myApp(base_1, form_1):
    def __init__(self):
        super(base_1, self).__init__()
        self.setupUi(self)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    ex = myApp()
    ex.show()
    sys.exit(app.exec_())

├── main.py
├── neulabel.py
└── testpromote.ui

這篇關(guān)于我在哪里為 Qt 設(shè)計器的單個提升 QWidget 編寫類的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！