python - 如何使工具栏中的工具按钮一次只能选择一个？

Question

我通过 toolbar.addAction() 在 QToolbar 中有五个工具按钮，如果我选择其中一个，我想让其他按钮看起来不被选中。

示例:如果我选择“A”按钮并且程序现在处于“A”模式，则其他程序将无法运行。

Answer 1

您必须使用 QActionGroup，还必须激活 QAction 的 checkable 属性:

import sys
from PyQt5 import QtCore, QtGui, QtWidgets


class ToolDemo(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(ToolDemo, self).__init__(parent)
        self.setWindowTitle("toolbar demo")

        toolbarBox = QtWidgets.QToolBar(self)
        toolbarBox.setFixedWidth(180)

        self.addToolBar(QtCore.Qt.RightToolBarArea, toolbarBox)

        vscode_action = QtWidgets.QAction("VSCode", self, checkable=True)
        ptt_action = QtWidgets.QAction("Ppt", self, checkable=True)
        word_action = QtWidgets.QAction("Word", self, checkable=True)
        excel_action = QtWidgets.QAction("Excel", self, checkable=True)
        other_action = QtWidgets.QAction("other", self, checkable=True)

        group = QtWidgets.QActionGroup(self, exclusive=True)

        for action in (
            vscode_action,
            ptt_action,
            word_action,
            excel_action,
            other_action,
        ):
            toolbarBox.addAction(action)
            group.addAction(action)


def main():
    app = QtWidgets.QApplication(sys.argv)
    ex = ToolDemo()
    ex.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

更新:

如果你想使用 QCheckBox、QRadioButton、QPushButton 和 QToolButton 等 QToolBar 中独有的按钮，那么你必须使用 QButtonGroup:

import sys
from PyQt5 import QtCore, QtGui, QtWidgets


class ToolDemo(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(ToolDemo, self).__init__(parent)
        self.setWindowTitle("toolbar demo")

        toolbarBox = QtWidgets.QToolBar(self)
        toolbarBox.setFixedWidth(180)

        self.addToolBar(QtCore.Qt.RightToolBarArea, toolbarBox)

        vscode_button = QtWidgets.QCheckBox(self, text="VSCode", checkable=True)
        ptt_button = QtWidgets.QCheckBox(self, text="Ppt", checkable=True)
        word_button = QtWidgets.QRadioButton(self, text="Word", checkable=True)
        excel_button = QtWidgets.QPushButton(self, text="Excel", checkable=True)
        other_button = QtWidgets.QToolButton(self, text="other", checkable=True)

        group = QtWidgets.QButtonGroup(self, exclusive=True)

        for button in (
            vscode_button,
            ptt_button,
            word_button,
            excel_button,
            other_button,
        ):
            toolbarBox.addWidget(button)
            group.addButton(button)


def main():
    app = QtWidgets.QApplication(sys.argv)
    ex = ToolDemo()
    ex.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()