- QMessageBox
在这种情况下,QMessageBox
在方法中调整大小exec_()
,因此可能的解决方案是QTimer.singleShot()
在显示后立即更改几何图形。
from functools import partial
from PyQt5 import QtCore, QtWidgets
def center(window):
# https://wiki.qt.io/How_to_Center_a_Window_on_the_Screen
window.setGeometry(
QtWidgets.QStyle.alignedRect(
QtCore.Qt.LeftToRight,
QtCore.Qt.AlignCenter,
window.size(),
QtWidgets.qApp.desktop().availableGeometry(),
)
)
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.btn_warning = QtWidgets.QPushButton(
"Open QMessageBox", clicked=self.open_qmessagebox
)
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.btn_warning)
center(self)
@QtCore.pyqtSlot()
def open_qmessagebox(self):
infoBox = QtWidgets.QMessageBox()
infoBox.setIcon(QtWidgets.QMessageBox.Warning)
infoBox.setWindowTitle("Warning")
infoBox.setText("The XXX Already exist in the current Directory")
wrapper = partial(center, infoBox)
QtCore.QTimer.singleShot(0, wrapper)
infoBox.exec_()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
- QInputDialog
在 QInputDialog 的情况下,QInputDialog::getText() 方法是静态的,因此“self.cuadro”对象不是窗口,因为窗口是在该方法中创建的。如果您将父级传递给 getText() ,那么默认情况下它将相对于此居中。
因此,如果 QMainWindow 居中并假设 QMainWindow 是自身,则无需修改任何内容。
相反,如果父级不在屏幕中央,则有 2 种可能的解决方案:
- 不要使用静态方法,通过 QInputDialog 实例实现逻辑:
from functools import partial
from PyQt5 import QtCore, QtWidgets
def center(window):
# https://wiki.qt.io/How_to_Center_a_Window_on_the_Screen
window.setGeometry(
QtWidgets.QStyle.alignedRect(
QtCore.Qt.LeftToRight,
QtCore.Qt.AlignCenter,
window.size(),
QtWidgets.qApp.desktop().availableGeometry(),
)
)
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.btn_inputdialog = QtWidgets.QPushButton(
"Open QInputDialog", clicked=self.open_qinputdialog
)
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.btn_inputdialog)
center(self)
@QtCore.pyqtSlot()
def open_qinputdialog(self):
dialog = QtWidgets.QInputDialog(self)
dialog.setWindowTitle("New File")
dialog.setLabelText("File Name:")
dialog.setTextEchoMode(QtWidgets.QLineEdit.Normal)
dialog.setTextValue("")
wrapper = partial(center, dialog)
QtCore.QTimer.singleShot(0, wrapper)
text, okPressed = (
dialog.textValue(),
dialog.exec_() == QtWidgets.QDialog.Accepted,
)
if okPressed and text:
print(text)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
- 继续使用静态方法,使用 findChildren() 获取窗口
from functools import partial
from PyQt5 import QtCore, QtWidgets
def center(window):
# https://wiki.qt.io/How_to_Center_a_Window_on_the_Screen
window.setGeometry(
QtWidgets.QStyle.alignedRect(
QtCore.Qt.LeftToRight,
QtCore.Qt.AlignCenter,
window.size(),
QtWidgets.qApp.desktop().availableGeometry(),
)
)
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.btn_inputdialog = QtWidgets.QPushButton(
"Open QInputDialog", clicked=self.open_qinputdialog
)
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.btn_inputdialog)
center(self)
@QtCore.pyqtSlot()
def open_qinputdialog(self):
parent = self
dialogs = parent.findChildren(QtWidgets.QInputDialog)
def onTimeout():
dialog, *_ = set(parent.findChildren(QtWidgets.QInputDialog)) - set(dialogs)
center(dialog)
QtCore.QTimer.singleShot(0, onTimeout)
text, okPressed = QtWidgets.QInputDialog.getText(
parent, "New File", "File Name:", QtWidgets.QLineEdit.Normal, ""
)
if okPressed and text:
print(text)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())