PySide2 Pop-up Window -- QInputDialog QMessageBox QFileDialog

Foreword

Original article:
https://blog.csdn.net/weixin_50113231/article/details/124102931

1. QInputDialog

Official Document: https://doc.qt.io/qt-5.15/QInputDialog.html

1.1 Input Integer

The function of the next four numbers is initial value, minimum value, maximum, stride.

value, ok = QInputDialog.getInt(self, "Title", "Prompt information", 37, -10000, 10000, 2)

1.2 Input Decimal

The function of the next four numbers is initial value, minimum value, maximum, number of decimal places.

value, ok = QInputDialog.getDouble(self, "Title", "Prompt information", 37.56, -10000, 10000, 2)

1.3 Input Text

The third parameter indicates the display type: QLineEdit.Normal, QLineEdit. Password, QLineEdit. NoEcho

value, ok = QInputDialog.getText(self, "Title", "Prompt information", QLineEdit.Normal, "This is the default value")

1.4 Input Multiple Text

value, ok = QInputDialog.getMultiLineText(self, "Title", "Prompt information", "The default \n My address is \n Guangzhou Panyu, Guangdong, China")

1.5 Input Options

# `1` Selects the selected items by default. True/False Indicates whether the list box can be edited.
items = ["Spring", "Summer", "Fall", "Winter"]
value, ok = QInputDialog.getItem(self, "Title", "Prompt information", items, 1, True)

1.6 Sample

import sys
from PySide2.QtWidgets import *


class MyWindow(QWidget):

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

        self.setWindowTitle('PySide2 pop-up window')
        self.resize(400, 300)
        h1 = QHBoxLayout(self)
        btn = QPushButton('pop-up window')
        btn.clicked.connect(self.do_btn)
        h1.addWidget(btn)

    def do_btn(self, event):
        value, ok = QInputDialog.getInt(self, "Title", "Prompt information", 37, -10000, 10000, 2)


if __name__ == "__main__":
    app = QApplication()
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())

2. QMessageBox

Official Document: https://doc.qt.io/qt-5.15/QMessageBox.html

2.1 Information QMessageBox

Respectively after two buttons (separated with |, a total of 7 types of button, after see sample) and the default button (omit the default for the first button)

reply = QMessageBox.information(self, "Title", "This is a message.", QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)

2.2 Question QMessageBox

reply = QMessageBox.question(self, "Title", "Is this a question ?", QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)

2.3 Warning QMessageBox

reply = QMessageBox.warning(self, "Title", "This is a warning.", QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)

2.4 Critical QMessageBox

reply = QMessageBox.critical(self, 'Title', 'Critical error dialog box message body.', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)

2.5 About QMessageBox

There is no need to insert the button type.

reply = QMessageBox.about(self, "Title", "This is a description of the software.")

2.6 Sample

import sys
from PySide2.QtWidgets import *


class MyWindow(QWidget):

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

        self.setWindowTitle('PySide2 Pop-up window')
        self.resize(400, 300)
        # self is added as a global layout, not as a local layout
        h1 = QVBoxLayout(self)

        btn1 = QPushButton('Information')
        btn1.clicked.connect(self.handle_information_button)

        btn2 = QPushButton('Question')
        btn2.clicked.connect(self.handle_question_button)

        btn3 = QPushButton('Warning')
        btn3.clicked.connect(self.handle_warning_button)

        btn4 = QPushButton('Critical')
        btn4.clicked.connect(self.handle_critical_button)

        btn5 = QPushButton('About')
        btn5.clicked.connect(self.handle_about_button)

        h1.addWidget(btn1)
        h1.addWidget(btn2)
        h1.addWidget(btn3)
        h1.addWidget(btn4)
        h1.addWidget(btn5)

    def handle_information_button(self):
        reply = QMessageBox.information(self, "Title", "This is a message.", QMessageBox.Yes | QMessageBox.No,
                                        QMessageBox.Yes)

    def handle_question_button(self):
        reply = QMessageBox.question(self, "Title", "Is this a question ?", QMessageBox.Yes | QMessageBox.No,
                                     QMessageBox.Yes)

    def handle_warning_button(self):
        reply = QMessageBox.warning(self, "Title", "This is a warning.", QMessageBox.Yes | QMessageBox.No,
                                    QMessageBox.Yes)

    def handle_critical_button(self):
        reply = QMessageBox.critical(self, 'Title', 'Critical error dialog box message body.',
                                     QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)

    def handle_about_button(self):
        reply = QMessageBox.about(self, "Title", "This is a description of the software.")


if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())

2.7 Button Type

(1) Standard button type

Constant	Description
QMessageBox.Ok	An “OK” button defined with the AcceptRole.
QMessageBox.Cancel	A “Cancel” button defined with the RejectRole.
QMessageBox.Yes	A “Yes” button defined with the YesRole.
QMessageBox.No	A “No” button defined with the NoRole.
QMessageBox.Abort	An “Abort” button defined with the RejectRole.
QMessageBox.Retry	A “Retry” button defined with the AcceptRole.
QMessageBox.Ignore	An “Ignore” button defined with the AcceptRole.

You can see the details:
https://doc.qt.io/qt-5.15/qmessagebox.html#default-and-escape-keys

(2) Customize the button type

import sys
from PySide2.QtWidgets import *


class MyWindow(QWidget):

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

        self.setWindowTitle('PyQt5 弹出窗口')
        self.resize(400, 300)
        # 加了self为全局布局，没加为局部布局
        h1 = QHBoxLayout(self)
        btn = QPushButton('弹出窗口')
        btn.clicked.connect(self.do_btn)
        h1.addWidget(btn)

    def do_btn(self):
        # 创建Question消息框
        self.reply = QMessageBox(QMessageBox.Question, "消息框标题", "这是一条消息。")
        # 添加自定义按钮
        self.reply.addButton('确定', QMessageBox.YesRole)
        self.reply.addButton('取消', QMessageBox.NoRole)
        # 设置消息框中内容前面的图标
        # self.reply.setIcon(1)
        self.reply.show()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())

Watch out!! Reply needs to be an object property of the window (self.reply), otherwise the window will flash by!!

3. QFileDialog

Official Document: https://doc.qt.io/qt-5.15/QFileDialog.html

3.1 Directory

directory = QFileDialog.getExistingDirectory(self, "Select a directory", "C:/")  # The initial path

3.2 Singe File

# Set file extension filtering. Use a double semicolon interval
file_, filetype = QFileDialog.getOpenFileName(self, "Select the file", "C:/", "All Files (*);;Text Files (*.txt)")

3.3 Multiple Files

files, ok = QFileDialog.getOpenFileNames(self, "Multiple files selection", "C:/", "All Files (*);;Text Files (*.txt)")

Ctrl button to select multiple files.

3.4 Save

file_, ok = QFileDialog.getSaveFileName(self, "File saving", "C:/", "All Files (*);;Text Files (*.txt)")

3.5 Save as

file_, ok = QFileDialog.getSaveFileName(self, "Save the file as", "C:/", "All Files (*);;Text Files (*.txt)")

No different from 4.

3.6 Sample

import sys
from PySide2.QtWidgets import *


class MyWindow(QWidget):

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

        self.setWindowTitle('PySide2 pop-up window')
        self.resize(400, 300)
        h1 = QHBoxLayout(self)
        btn = QPushButton('pop-up window')
        btn.clicked.connect(self.do_btn)
        h1.addWidget(btn)

    def do_btn(self, event):
        dir_ = QFileDialog.getExistingDirectory(self, "Select a directory", "C:/")  # The initial path


if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())