为什么 class 继承另一个 class 不会产生与 'another class' 相同的结果?
Why does a class inhering another class not produce the same results as 'another class'?
我正在 Python 使用 PyQt5 开发一个应用程序。这是有问题的代码:
class Dialog(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.layout = QtWidgets.QGridLayout()
self.main = QtWidgets.QWidget()
self.main.setLayout(self.layout)
self.setStyleSheet(QMainWindowStyle)
self.setCentralWidget(self.main)
self.show()
class AppearanceTab(QtWidgets.QWidget):
def __init__(self):
super().__init__()
class SettingsDialog(Dialog):
def __init__(self):
super().__init__()
self.tabs = QtWidgets.QTabWidget(self)
self.tabs.setStyleSheet(QTabWidgetStyle)
self.layout.addWidget(self.tabs)
self.tab_appearance = AppearanceTab()
self.tab_appearance.setStyleSheet(QWidgetStyle)
self.tab_appearance_layout = QtWidgets.QGridLayout()
self.tab_appearance.setLayout(self.tab_appearance_layout)
self.tabs.addTab(self.tab_appearance, "Appearance")
self.tab_server = QtWidgets.QWidget()
self.tab_server.setStyleSheet(QWidgetStyle)
self.tab_server_layout = QtWidgets.QGridLayout()
self.tab_server.setLayout(self.tab_server_layout)
self.tabs.addTab(self.tab_server, "Server")
为什么当 self.tab_appearance
是一个 AppearanceTab
实例时( 应该 是 QWidget
的副本)它有一个不同的当 self.tab_server
是 QWidget
?
的实例时,将样式更改为 self.tab_server
(即背景颜色发生变化)
样式表只定义了 background-color: #333333
和 color: #dddddd
.
提前致谢。
编辑:
我认为样式表没有正确应用于 AppearanceTab
,但是我不知道为什么会这样,因为它只是继承自 QWidget
。
编辑 2:
可以找到一个 MCVE(连同我项目的其余部分)on github。
在文档中,有一段 paragraph about inheritance 和样式:
Inheritance
In classic CSS, when font and color of an item is not explicitly set, it gets automatically inherited from the parent. When using Qt Style Sheets, a widget does not automatically inherit its font and color setting from its parent widget.
If we want to set the color on a QGroupBox and its children, we can write:
qApp->setStyleSheet("QGroupBox, QGroupBox * { color: red; }");
所以你可能想改变
QMainWindowStyle = QMainWindow {color: #dddddd; background-color: #333333;}
到
QMainWindowStyle = QMainWindow, QMainWindow * {color: #dddddd; background-color: #333333;}
这样主 window 的所有子部件都具有相同的样式。
试一试:
from PyQt5 import QtWidgets
class Dialog(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.layout = QtWidgets.QGridLayout()
self.main = QtWidgets.QWidget()
self.main.setLayout(self.layout)
# self.setStyleSheet(QMainWindowStyle)
self.setCentralWidget(self.main)
self.show()
class AppearanceTab(QtWidgets.QWidget):
def __init__(self):
super().__init__()
class SettingsDialog(Dialog):
def __init__(self):
super().__init__()
self.tabs = QtWidgets.QTabWidget(self)
# self.tabs.setStyleSheet(QTabWidgetStyle)
self.layout.addWidget(self.tabs)
self.tab_appearance = AppearanceTab()
# self.tab_appearance.setStyleSheet(QWidgetStyle)
## self.tab_appearance.setStyleSheet("QWidget, QWidget * {color: #dddddd; background-color: #333333;}") #note: Tried this however it didn't work.
self.tab_appearance_layout = QtWidgets.QGridLayout()
self.tab_appearance.setLayout(self.tab_appearance_layout)
self.tabs.addTab(self.tab_appearance, "Appearance")
self.tab_server = QtWidgets.QWidget()
# self.tab_server.setStyleSheet(QWidgetStyle)
self.tab_server_layout = QtWidgets.QGridLayout()
self.tab_server.setLayout(self.tab_server_layout)
self.tabs.addTab(self.tab_server, "Server")
style = """
QWidget {
color: #dddddd;
background-color: #333333;
}
QMainWindow {
color: #dddddd;
background-color: #333333;
}
QTabWidget {
background-color: #333333;
color: #dddddd;
}
QTabBar {
color: #dddddd;
background-color: #333333;
}
"""
if __name__ == "__main__":
QtWidgets.QApplication.setStyle(QtWidgets.QStyleFactory.create("Fusion"))
app = QtWidgets.QApplication([])
app.setStyleSheet(style) # < ---
d = SettingsDialog()
print(app.exec_())
我正在 Python 使用 PyQt5 开发一个应用程序。这是有问题的代码:
class Dialog(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.layout = QtWidgets.QGridLayout()
self.main = QtWidgets.QWidget()
self.main.setLayout(self.layout)
self.setStyleSheet(QMainWindowStyle)
self.setCentralWidget(self.main)
self.show()
class AppearanceTab(QtWidgets.QWidget):
def __init__(self):
super().__init__()
class SettingsDialog(Dialog):
def __init__(self):
super().__init__()
self.tabs = QtWidgets.QTabWidget(self)
self.tabs.setStyleSheet(QTabWidgetStyle)
self.layout.addWidget(self.tabs)
self.tab_appearance = AppearanceTab()
self.tab_appearance.setStyleSheet(QWidgetStyle)
self.tab_appearance_layout = QtWidgets.QGridLayout()
self.tab_appearance.setLayout(self.tab_appearance_layout)
self.tabs.addTab(self.tab_appearance, "Appearance")
self.tab_server = QtWidgets.QWidget()
self.tab_server.setStyleSheet(QWidgetStyle)
self.tab_server_layout = QtWidgets.QGridLayout()
self.tab_server.setLayout(self.tab_server_layout)
self.tabs.addTab(self.tab_server, "Server")
为什么当 self.tab_appearance
是一个 AppearanceTab
实例时( 应该 是 QWidget
的副本)它有一个不同的当 self.tab_server
是 QWidget
?
self.tab_server
(即背景颜色发生变化)
样式表只定义了 background-color: #333333
和 color: #dddddd
.
提前致谢。
编辑:
我认为样式表没有正确应用于 AppearanceTab
,但是我不知道为什么会这样,因为它只是继承自 QWidget
。
编辑 2:
可以找到一个 MCVE(连同我项目的其余部分)on github。
在文档中,有一段 paragraph about inheritance 和样式:
Inheritance
In classic CSS, when font and color of an item is not explicitly set, it gets automatically inherited from the parent. When using Qt Style Sheets, a widget does not automatically inherit its font and color setting from its parent widget.
If we want to set the color on a QGroupBox and its children, we can write:
qApp->setStyleSheet("QGroupBox, QGroupBox * { color: red; }");
所以你可能想改变
QMainWindowStyle = QMainWindow {color: #dddddd; background-color: #333333;}
到
QMainWindowStyle = QMainWindow, QMainWindow * {color: #dddddd; background-color: #333333;}
这样主 window 的所有子部件都具有相同的样式。
试一试:
from PyQt5 import QtWidgets
class Dialog(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.layout = QtWidgets.QGridLayout()
self.main = QtWidgets.QWidget()
self.main.setLayout(self.layout)
# self.setStyleSheet(QMainWindowStyle)
self.setCentralWidget(self.main)
self.show()
class AppearanceTab(QtWidgets.QWidget):
def __init__(self):
super().__init__()
class SettingsDialog(Dialog):
def __init__(self):
super().__init__()
self.tabs = QtWidgets.QTabWidget(self)
# self.tabs.setStyleSheet(QTabWidgetStyle)
self.layout.addWidget(self.tabs)
self.tab_appearance = AppearanceTab()
# self.tab_appearance.setStyleSheet(QWidgetStyle)
## self.tab_appearance.setStyleSheet("QWidget, QWidget * {color: #dddddd; background-color: #333333;}") #note: Tried this however it didn't work.
self.tab_appearance_layout = QtWidgets.QGridLayout()
self.tab_appearance.setLayout(self.tab_appearance_layout)
self.tabs.addTab(self.tab_appearance, "Appearance")
self.tab_server = QtWidgets.QWidget()
# self.tab_server.setStyleSheet(QWidgetStyle)
self.tab_server_layout = QtWidgets.QGridLayout()
self.tab_server.setLayout(self.tab_server_layout)
self.tabs.addTab(self.tab_server, "Server")
style = """
QWidget {
color: #dddddd;
background-color: #333333;
}
QMainWindow {
color: #dddddd;
background-color: #333333;
}
QTabWidget {
background-color: #333333;
color: #dddddd;
}
QTabBar {
color: #dddddd;
background-color: #333333;
}
"""
if __name__ == "__main__":
QtWidgets.QApplication.setStyle(QtWidgets.QStyleFactory.create("Fusion"))
app = QtWidgets.QApplication([])
app.setStyleSheet(style) # < ---
d = SettingsDialog()
print(app.exec_())