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Clark Devlin
Asked:2022-08-06 15:58:13 +0000 UTC2022-08-06 15:58:13 +0000 UTC

PyQT中的定位元素

  • 772

我想知道如果您编写小类而不使用Qt Designer.
我经常看到在这里回答问题的人Qt以类似的方式写作。

from PyQt5 import QtWidgets


class HelpDialog(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super(HelpDialog, self).__init__(parent)

        layout = QtWidgets.QGridLayout(self)

        text_widget = QtWidgets.QLabel('anytext')
        btnOk = QtWidgets.QPushButton("Ок", clicked=self.hide)

        layout.addWidget(text_widget, 0, 0, 1, 1)
        layout.addWidget(btnOk, 3, 1, 1, 1)
python qt

1 个回答

  1. Best Answer

    布局管理

    Qt 布局系统提供了一种简单而强大的方式来自动在小部件中布置子小部件，以确保它们有效地利用可用空间。

    ...

    这不取决于班级的大小，只需要付诸实践。
    这是一个基本的例子 - 观察和学习。

    from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog,
    QDialogButtonBox, QFormLayout, QGridLayout, QGroupBox, QHBoxLayout,
    QLabel, QLineEdit, QMenu, QMenuBar, QPushButton, QSpinBox, QTextEdit,
    QVBoxLayout)


class Dialog(QDialog):
    NumGridRows = 3
    NumButtons  = 4

    def __init__(self):
        super(Dialog, self).__init__()

        self.createMenu()
        self.createHorizontalGroupBox()
        self.createGridGroupBox()
        self.createFormGroupBox()

        bigEditor = QTextEdit()
        bigEditor.setPlainText(
            "Этот виджет занимает все оставшееся пространство "
            "в макете верхнего уровня."
        )

        buttonBox = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
        buttonBox.accepted.connect(self.accept)
        buttonBox.rejected.connect(self.reject)

        mainLayout = QVBoxLayout()
        mainLayout.setMenuBar(self.menuBar)
        mainLayout.addWidget(self.horizontalGroupBox)
        mainLayout.addWidget(self.gridGroupBox)
        mainLayout.addWidget(self.formGroupBox)
        mainLayout.addWidget(bigEditor)
        mainLayout.addWidget(buttonBox)
        self.setLayout(mainLayout)

        self.setWindowTitle("Basic Layouts")

    def createMenu(self):
        self.menuBar = QMenuBar()

        self.fileMenu = QMenu("&File", self)
        self.exitAction = self.fileMenu.addAction("E&xit")
        self.menuBar.addMenu(self.fileMenu)

        self.exitAction.triggered.connect(self.accept)

    def createHorizontalGroupBox(self):
        self.horizontalGroupBox = QGroupBox("Horizontal layout")
        layout = QHBoxLayout()

        for i in range(Dialog.NumButtons):
            button = QPushButton("Button %d" % (i + 1))
            layout.addWidget(button)

        self.horizontalGroupBox.setLayout(layout)

    def createGridGroupBox(self):
        self.gridGroupBox = QGroupBox("Grid layout")
        layout = QGridLayout()

        for i in range(Dialog.NumGridRows):
            label = QLabel("Line %d:" % (i + 1))
            lineEdit = QLineEdit()
            layout.addWidget(label,    i + 1, 0)
            layout.addWidget(lineEdit, i + 1, 1)

        self.smallEditor = QTextEdit()
        self.smallEditor.setPlainText(
            "Этот виджет занимает около двух третей "
            "макета сетки. \n Смотрим соотношение `setColumnStretch`!"
        )

        layout.addWidget(self.smallEditor, 0, 2, 5, 1)   # 0, 2, 4, 1

        # QGridLayout.setColumnStretch(column, stretch)
        # Устанавливает растягивающий коэффициент столбца столбца для растягивания. 
        # Первый столбец - номер 0.
        #layout.setColumnStretch(0, 1)      # label
        layout.setColumnStretch(1, 10)      # lineEdit
        layout.setColumnStretch(2, 20)      # smallEditor
        self.gridGroupBox.setLayout(layout)

    def createFormGroupBox(self):
        self.formGroupBox = QGroupBox("Form layout")
        layout = QFormLayout()
        layout.addRow(QLabel("Line 1:"), QLineEdit())
        layout.addRow(QLabel("Строка 2, длинный текст:"), QComboBox())
        layout.addRow(QLabel("Line 3:"), QSpinBox())
        self.formGroupBox.setLayout(layout)


if __name__ == '__main__':
    import sys
    app    = QApplication(sys.argv)
    dialog = Dialog()
    sys.exit(dialog.exec_())

    在此处输入图像描述

    • 2

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