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[英]How to override PySide2 widget's method generated by Qt Designer?
[英]Using a custom PySide2 widget in Qt Designer
我正在尋找一種在Qt Designer中有效使用自定義窗口小部件的方法,該設計器是使用Qt for Python(PySide2)編寫的。
我發現,這是可能的設計與底座插件的界面,然后就掉出類的UI文件我的自定義窗口小部件和通知QUiLoader
有關子分類loader.registerCustomWidget(MyMainWindow)
但隨后再次打開它在Qt Designer中效果不佳。
我在PyQt的類似問題中讀到,您必須為自定義窗口小部件編寫插件。 PySide2是否也存在這種可能性?
一些示例代碼:
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,應用程序將毫無疑問地關閉。
<?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
使用此版本時,系統會詢問您是否真的要退出。
<?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>
段由Qt Designer在再次打開后添加。
修改后,Qt Designer無法正確放置三個標簽。
在Qt Designer中使用自定義小部件的主要方法有2種:
這是最簡單,最省力的方式,如果它是一個內部小部件,則只需右鍵單擊該小部件並選擇Promote To ... ,然后在:
上面所做的是生成以下內容:
...
<widget class="RadialBar" name="widget" native="true"/>
...
<customwidgets>
<customwidget>
<class>RadialBar</class>
<extends>QWidget</extends>
<header>radialbar.h</header>
<container>1</container>
</customwidget>
</customwidgets>
...
也就是說,更改類,並在customwidget中添加一個指向該類名稱的字段: <class> NAME_OF_CLASS </class>
,它們繼承的類的名稱<extends>CLASS_EXTENDS</extends>
以及更改文件擴展名的文件路徑從.py到.h <header>PATH_OF_FILE.h</header>
,即與您輸入表單相同的數據。
對於根窗口小部件,它無法通過Qt Designer完成,但是我看到您已經了解了邏輯,但沒有正確修改所有內容,主要錯誤是指出它們從中繼承的類
<customwidgets>
<customwidget>
<class>MyMainWindow</class>
<extends>QMainWindow</extends> <----
<header>mymainwindow.h</header>
<container>1</container>
</customwidget>
</customwidgets>
因此正確的文件是:
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_())
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