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Add 03-12-01-03
QDialog-槽尺寸拖拽
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import sys
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from PySide6 import QtCore, QtWidgets
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"""
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QDialog 槽、结果、尺寸拖拽控件
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QDialog有一组槽,用于显示、关闭对话框并返回结果:
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.accept() 隐藏模态对话框,并将结果码设置为 QDialog.Accepted
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.reject() 隐藏模态对话框,并将结果码设置为 QDialog.Rejected,键盘Esc键、直接关闭对话框也会触发
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.open() 将对话框作为窗口级模态显示,立即返回
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.done(r: int) 关闭对话框并将其结果码设置为r,finished()信号立即发射r。若此对话框以exec()显示,
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则done()也将导致局部事件循环结束,且exec()返回r。
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.exec() 将对话框作为模态对话框显示。(默认为应用程序级模态)此函数返回QDialog.Accepted或QDialog.Rejected。
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尽量避免使用exec()函数,而用open()替代。因为open()是异步的,并且不会增加额外的事件循环
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QDialog.result中保存了对话框获得的结果,也可以通过代码显式设置结果码:
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.result() -> int 获取模态对话框的结果码,QDialog.Accepted为1,QDialog.Rejected为0
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.setResult(i: int) 将模态对话框的结果码设置为i
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获取对话框结果码的几种方式:
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- .exec() 的返回值,例如 result = my_dialog.exec()
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- finished(result: int) 信号传递
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- .result() 的返回值
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QDialog可以指定是否在窗口右下角显示一个QSizeGrip控件,方便用户将光标置于其上拖拽调整窗口大小
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.setSizeGripEnabled(enable: bool) 设置是否使用尺寸拖拽控件(默认为否)
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.isSizeGripEnabled() -> bool 获取尺寸拖拽控件启用状态
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"""
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class MyWidget(QtWidgets.QWidget):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.setWindowTitle("QDialog-槽")
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self.resize(800, 600)
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self.dialog = QtWidgets.QDialog(self)
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self.setup_ui()
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self.setup_dialog()
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def setup_ui(self) -> None:
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"""设置界面"""
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# 用于显示对话框
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open_dialog_btn = QtWidgets.QPushButton("打开对话框(Open)", self)
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open_dialog_btn.move(200, 200)
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open_dialog_btn.clicked.connect(self.dialog.open) # type: ignore
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exec_dialog_btn = QtWidgets.QPushButton("打开对话框(Exec)", self)
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exec_dialog_btn.move(400, 200)
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exec_dialog_btn.clicked.connect(self.dialog.exec) # type: ignore
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# 用于显示对话框返回值
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info_label = QtWidgets.QLabel(self)
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info_label.move(220, 300)
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@QtCore.Slot(int)
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def show_result(result: int) -> None:
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info_label.setText(f"对话框窗口的返回值为:{result}")
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info_label.adjustSize()
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self.dialog.finished.connect(show_result) # type: ignore
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def setup_dialog(self) -> None:
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"""设置对话框窗口"""
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self.dialog.setWindowTitle("对话框-测试槽功能")
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self.dialog.setSizeGripEnabled(True) # 在对话框右下角显示易于拖拽控制窗口尺寸的把手
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btn_1 = QtWidgets.QPushButton("Accept")
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btn_1.clicked.connect(self.dialog.accept) # type: ignore
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btn_2 = QtWidgets.QPushButton("Reject")
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btn_2.clicked.connect(self.dialog.reject) # type: ignore
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btn_3 = QtWidgets.QPushButton("Done")
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spinbox = QtWidgets.QSpinBox()
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spinbox.setValue(50)
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# 将spinbox中用户设定的值作为对话框结果码返回
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btn_3.clicked.connect(lambda: self.dialog.done(spinbox.value())) # type: ignore
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# 布局管理器
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layout = QtWidgets.QHBoxLayout()
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layout.addWidget(btn_1)
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layout.addWidget(btn_2)
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layout.addWidget(spinbox)
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layout.addWidget(btn_3)
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self.dialog.setLayout(layout)
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if __name__ == "__main__":
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app = QtWidgets.QApplication(sys.argv)
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window = MyWidget()
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window.show()
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sys.exit(app.exec())
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