1。推广小部件：

Question

我正在寻找一种在Qt Designer中使用Qt for Python（PySide2）编写的自定义小部件的有效使用方法。

我发现，可以使用基本窗口小部件设计GUI，然后将类换出到UI文件中的自定义窗口小部件，并向QUiLoader告知子类loader.registerCustomWidget(MyMainWindow) ，但随后在Qt Designer中再次打开它效果不佳。

我读过this similar question for PyQt，您必须为自定义窗口小部件编写一个插件。 PySide2是否也存在这种可能性？

一些示例代码：

custom_widget.py：

import sys

from PySide2.QtUiTools import QUiLoader
from PySide2.QtWidgets import QApplication, QMainWindow, QAction, QMessageBox, QFileDialog, QTextBrowser
from PySide2.QtCore import QFile


class MyMainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setWindowTitle("Demo QtWidget App")

    def closeEvent(self, event):
        msgBox = QMessageBox()
        msgBox.setWindowTitle("Quit?")
        msgBox.setText("Exit application?")
        msgBox.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
        msgBox.setDefaultButton(QMessageBox.No)
        ret = msgBox.exec_()
        if ret == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()


if __name__ == '__main__':
    app = QApplication([])
    file = QFile("custom_widget_original.ui")
    #file = QFile("custom_widget_modified.ui")
    file.open(QFile.ReadOnly)
    loader = QUiLoader()
    loader.registerCustomWidget(MyMainWindow)
    main_window = loader.load(file)
    main_window.show()
    sys.exit(app.exec_())

custom_widget_original.ui

使用此版本，应用程序将毫无疑问地关闭。

<?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">
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QLabel" name="label_2">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
    <item row="0" column="2">
     <widget class="QLabel" name="label">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
    <item row="0" column="1">
     <widget class="QLabel" name="label_3">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
   <widget class="QMenu" name="menuFile">
    <property name="title">
     <string>File</string>
    </property>
    <addaction name="actionExit"/>
   </widget>
   <addaction name="menuFile"/>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
  <action name="actionExit">
   <property name="text">
    <string>Exit</string>
   </property>
  </action>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>actionExit</sender>
   <signal>triggered()</signal>
   <receiver>MainWindow</receiver>
   <slot>close()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>-1</x>
     <y>-1</y>
    </hint>
    <hint type="destinationlabel">
     <x>399</x>
     <y>299</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>

custom_widget_modified.ui

使用此版本时，系统会询问您是否真的要退出。

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="MyMainWindow" 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">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>155</width>
     <height>15</height>
    </rect>
   </property>
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QLabel" name="label_2">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
    <item row="0" column="2">
     <widget class="QLabel" name="label">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
    <item row="0" column="1">
     <widget class="QLabel" name="label_3">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
   <widget class="QMenu" name="menuFile">
    <property name="title">
     <string>File</string>
    </property>
    <addaction name="actionExit"/>
   </widget>
   <addaction name="menuFile"/>
  </widget>
  <widget class="QStatusBar" name="statusbar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>3</width>
     <height>18</height>
    </rect>
   </property>
  </widget>
  <action name="actionExit">
   <property name="text">
    <string>Exit</string>
   </property>
  </action>
 </widget>
 <customwidgets>
  <customwidget>
   <class>MyMainWindow</class>
   <extends>QWidget</extends>
   <header>mymainwindow.h</header>
   <container>1</container>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections>
  <connection>
   <sender>actionExit</sender>
   <signal>triggered()</signal>
   <receiver>MainWindow</receiver>
   <slot>close()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>-1</x>
     <y>-1</y>
    </hint>
    <hint type="destinationlabel">
     <x>399</x>
     <y>299</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>

<customwidgets>段是Qt Designer在再次打开后添加的。

修改后，Qt Designer无法正确放置三个标签。

Answer 1

在Qt Designer中使用自定义窗口小部件的主要方法有两种：

1。推广小部件：

这是最简单，最省力的方式，如果是内部窗口小部件，则只需右键单击该窗口小部件并选择 Promote To ... ，然后输入：

基本类名称选择继承的类
提升的班级名称放置班级的名称
Header File放置将扩展名.py更改为.h的文件的路径

以上内容所产生的是以下内容：

...
    <widget class="RadialBar" name="widget" native="true"/>
...
 <customwidgets>
  <customwidget>
   <class>RadialBar</class>
   <extends>QWidget</extends>
   <header>radialbar.h</header>
   <container>1</container>
  </customwidget>
 </customwidgets>
...

也就是说，更改类，并在 customwidget 中添加一个指向该类名称的字段：<class> NAME_OF_CLASS </class>，它们继承的类名称<extends>CLASS_EXTENDS</extends>和文件路径将文件扩展名从.py更改为.h <header>PATH_OF_FILE.h</header>，即与您输入表单相同的数据。

对于根窗口小部件，它无法通过Qt Designer完成，但是我看到您已经理解了逻辑但没有正确修改所有内容，主要错误是指出它们继承的类< / p>

 <customwidgets>
  <customwidget>
   <class>MyMainWindow</class>
   <extends>QMainWindow</extends> <----
   <header>mymainwindow.h</header>
   <container>1</container>
  </customwidget>
 </customwidgets>

因此正确的文件是：

custom_widget_modified.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="MyMainWindow" 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">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>155</width>
     <height>15</height>
    </rect>
   </property>
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QLabel" name="label_2">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
    <item row="0" column="2">
     <widget class="QLabel" name="label">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
    <item row="0" column="1">
     <widget class="QLabel" name="label_3">
      <property name="text">
       <string>TextLabel</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
   <widget class="QMenu" name="menuFile">
    <property name="title">
     <string>File</string>
    </property>
    <addaction name="actionExit"/>
   </widget>
   <addaction name="menuFile"/>
  </widget>
  <widget class="QStatusBar" name="statusbar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>3</width>
     <height>18</height>
    </rect>
   </property>
  </widget>
  <action name="actionExit">
   <property name="text">
    <string>Exit</string>
   </property>
  </action>
 </widget>
 <customwidgets>
  <customwidget>
   <class>MyMainWindow</class>
   <extends>QMainWindow</extends>
   <header>mymainwindow.h</header>
   <container>1</container>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections>
  <connection>
   <sender>actionExit</sender>
   <signal>triggered()</signal>
   <receiver>MainWindow</receiver>
   <slot>close()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>-1</x>
     <y>-1</y>
    </hint>
    <hint type="destinationlabel">
     <x>399</x>
     <y>299</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>

mymainwindow.py

import sys

from PySide2.QtUiTools import QUiLoader
from PySide2.QtWidgets import QApplication, QMainWindow, QMessageBox
from PySide2.QtCore import QFile


class MyMainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setWindowTitle("Demo QtWidget App")

    def closeEvent(self, event):
        msgBox = QMessageBox()
        msgBox.setWindowTitle("Quit?")
        msgBox.setText("Exit application?")
        msgBox.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
        msgBox.setDefaultButton(QMessageBox.No)
        ret = msgBox.exec_()
        if ret == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()


if __name__ == '__main__':
    app = QApplication([])
    file = QFile("custom_widget_modified.ui")
    file.open(QFile.ReadOnly)
    loader = QUiLoader()
    loader.registerCustomWidget(MyMainWindow)
    main_window = loader.load(file)
    main_window.show()
    sys.exit(app.exec_())

在Qt Designer中使用自定义PySide2小部件

1 个答案:

1。推广小部件：

2。推广小部件：