PYQT:如何将小部件粘贴到对话框的底部边缘

Question

运行此代码可以使用标签，leandit和两个按钮创建一个简单的对话框。所有的小部件都对对话的水平调整大小都很好地做出了响应。但是，对话框底部的按钮在垂直调整大小时不会粘贴在对话框窗口的下边缘。确保按钮始终位于对话框的底部边缘的可能性解决方案是什么？

from PyQt4 import QtCore, QtGui
app = QtGui.QApplication(sys.argv)

class mainWindow(QtGui.QMainWindow):
    def __init__(self):
        super(mainWindow, self).__init__()
        mainQWidget = QtGui.QWidget()
        mainLayout=QtGui.QFormLayout()
        mainLayout.setFieldGrowthPolicy(QtGui.QFormLayout.AllNonFixedFieldsGrow)
        label = QtGui.QLabel('My Label')  
        lineEdit = QtGui.QLineEdit()
        mainLayout.addRow(label, lineEdit)
        ButtonBox = QtGui.QGroupBox()
        ButtonsLayout = QtGui.QHBoxLayout()
        Button_01 = QtGui.QPushButton("Close")
        Button_02 = QtGui.QPushButton("Execute")
        ButtonsLayout.addWidget(Button_01)
        ButtonsLayout.addWidget(Button_02)
        ButtonBox.setLayout(ButtonsLayout)
        mainLayout.addRow(ButtonBox)
        mainQWidget.setLayout(mainLayout)
        self.setCentralWidget(mainQWidget)

if __name__ == '__main__':
    window = mainWindow()
    window.show()
    window.raise_() 
    window.resize(480,320)
    app.exec_()

Answer 1

我建议使用qvboxlayout作为您的主布局，在qformlayout和按钮的qhboxlayout之间进行延伸。

作为您当前对话框的示例：

import sys
from PyQt4 import QtGui

class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        label = QtGui.QLabel('My Label')
        line_edit = QtGui.QLineEdit()
        form_layout = QtGui.QFormLayout()
        form_layout.addRow(label, line_edit)
        close_button = QtGui.QPushButton('Close')
        execute_button = QtGui.QPushButton('Execute')
        button_layout = QtGui.QHBoxLayout()
        button_layout.addWidget(close_button)
        button_layout.addWidget(execute_button)
        main_layout = QtGui.QVBoxLayout()
        main_layout.addLayout(form_layout)
        main_layout.addStretch()
        main_layout.addLayout(button_layout)
        central_widget = QtGui.QWidget()
        central_widget.setLayout(main_layout)
        self.setCentralWidget(central_widget)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = MainWindow()
    window.resize(480, 320)
    window.show()
    sys.exit(app.exec_())