python - Qt Designer和PyQt程序中verticalLayout的大小不同
问题描述
在 Qt Designer 5.9 中,verticalLayout
intest.ui
与窗口边缘有一定的距离,但在加载test.ui
PyQt 5.11.3 后main.py
会verticalLayout
延伸到窗口边缘。
主.py:
#!/usr/bin/python3
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.uic import loadUi
class MainWindow(QMainWindow):
def __init__(self, parent=None):
super().__init__()
loadUi("test.ui", self)
def main():
app = QApplication(sys.argv)
main_window = MainWindow(app)
main_window.show()
sys.exit(app.exec_())
if __name__ == "__main__":
main()
测试.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>350</width>
<height>257</height>
</rect>
</property>
<property name="windowTitle">
<string>Test</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QGridLayout" name="gridLayout_2">
<item row="0" column="0">
<layout class="QVBoxLayout" name="verticalLayout">
<property name="leftMargin">
<number>0</number>
</property>
<property name="topMargin">
<number>0</number>
</property>
<item>
<spacer name="verticalSpacer_2">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>40</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QGroupBox" name="groupBox">
<layout class="QGridLayout" name="gridLayout">
<item row="1" column="1">
<widget class="QSpinBox" name="spinBox">
<property name="maximum">
<number>100000</number>
</property>
<property name="value">
<number>1000</number>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QLabel" name="label_2">
<property name="text">
<string>Test</string>
</property>
<property name="alignment">
<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QComboBox" name="comboBox">
<property name="currentText">
<string/>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="label1">
<property name="text">
<string>Test</string>
</property>
<property name="alignment">
<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
</property>
</widget>
</item>
</layout>
</widget>
</item>
<item>
<spacer name="verticalSpacer">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>40</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="pushButton">
<property name="layoutDirection">
<enum>Qt::LeftToRight</enum>
</property>
<property name="text">
<string>Test</string>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>350</width>
<height>28</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>
test.ui
Qt Designer 5.9 中的屏幕截图:
main.py
加载截图test.ui
:
这种行为的原因是什么?
解决方案
如果您检查代码,uic.loadUi()
您会发现以下代码:
uiparser.py
class UIParser(object):
# ...
def createLayout(self, elem):
# ...
margin = -1 if self.stack.topIsLayout() else self.defaults['margin']
margin = self.wprops.getProperty(elem, 'margin', margin)
left = self.wprops.getProperty(elem, 'leftMargin', margin)
top = self.wprops.getProperty(elem, 'topMargin', margin)
right = self.wprops.getProperty(elem, 'rightMargin', margin)
bottom = self.wprops.getProperty(elem, 'bottomMargin', margin)
# A layout widget should, by default, have no margins.
if self.stack.topIsLayoutWidget():
if left < 0: left = 0
if top < 0: top = 0
if right < 0: right = 0
if bottom < 0: bottom = 0
def topIsLayoutWidget(self):
# A plain QWidget is a layout widget unless it's parent is a
# QMainWindow or a container widget. Note that the corresponding uic
# test is a little more complicated as it involves features not
# supported by pyuic.
if type(self[-1]) is not QtWidgets.QWidget:
return False
if len(self) < 2:
return False
parent = self[-2]
return isinstance(parent, QtWidgets.QWidget) and type(parent) not in (
QtWidgets.QMainWindow,
QtWidgets.QStackedWidget,
QtWidgets.QToolBox,
QtWidgets.QTabWidget,
QtWidgets.QScrollArea,
QtWidgets.QMdiArea,
QtWidgets.QWizard,
QtWidgets.QDockWidget)
问题是由topIsLayoutWidget()
函数引起的,因为父级将引用用作基础的小部件,在这种情况下,MainWindow 符合isinstance(parent, QtWidgets.QWidget) and type (parent) not in (QtWidgets.QMainWindow, ...)
因此topIsLayoutWidget()
将返回 True,因此左、上、右、下为 -1,因为这些属性确实not exist 将更新为 0,因此contentsMargins
将通过消除默认值 (9, 9, 9, 9) 来建立应用,但在 Qt Designer 的情况下,contentsMargins
尚未更新保持其默认值。
所以总而言之,这是一个 pyqt 错误,它也在评论中指出:
# ... Note that the corresponding uic
# test is a little more complicated as it involves features not
# supported by pyuic.*
所以有几种解决方案:
消除:
if self.stack.topIsLayoutWidget(): if left < 0: left = 0 if top < 0: top = 0 if right < 0: right = 0 if bottom < 0: bottom = 0
使用
uic.loadUiType()
:#!/usr/bin/python3 import sys from PyQt5 import QtCore, QtWidgets, uic Ui_Interface, _ = uic.loadUiType('test.ui') class MainWindow(QtWidgets.QMainWindow, Ui_Interface): def __init__(self, parent=None): super().__init__(parent) self.setupUi(self) def main(): app = QtWidgets.QApplication(sys.argv) main_window = MainWindow() main_window.show() sys.exit(app.exec_()) if __name__ == "__main__": main()
我更喜欢第二种解决方案,因为不应修改源代码。
推荐阅读
- android-studio - Android Studio - 更新到 4.2 后生成 apk 时出现错误(密码验证失败)
- r - 如何传播与 strsplit 结合的小标题?
- python - 继续获取此 Python 代码的 SyntaxError
- llvm - 获取对结构的每个成员变量的访问次数或频率
- c# - 将 ASP.NET Core 5 Web API 发布到 Azure 应用服务
- sharepoint - 如何在不单击 SharePoint 网站上的“同步”按钮的情况下自动与本地设备上的每个用户同步共享的 SharePoint 文档?
- html - 如何将页脚中的菜单向右移动?
- python - 如何使用 pipetools 为以功能范式编写的函数编写文档字符串
- javascript - 需要获取总的 updatedPriceComplete 和 updatedPricePartial 随 $i 变化
- c++ - 带有 std::stringstream 的 C++ 模板特化