PYQT5(22)-信号与槽-窗口数据传递

单一窗口数据传递

代码示例

import sys
from PyQt5.QtWidgets import QWidget, QLCDNumber, QSlider, QVBoxLayout, QApplication
from PyQt5.QtCore import Qt


class WinForm(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        # 1 先创建滑块和 LCD 部件
        lcd = QLCDNumber(self)
        slider = QSlider(Qt.Horizontal, self)

        # 2 通过QVboxLayout来设置布局
        vBox = QVBoxLayout()
        vBox.addWidget(lcd)
        vBox.addWidget(slider)

        self.setLayout(vBox)
        # 3 valueChanged()是Qslider的一个信号函数，只要slider的值发生改变，它就会发射一个信号，然后通过connect连接信号的接收部件，也就是lcd。
        slider.valueChanged.connect(lcd.display)

        self.setGeometry(300, 300, 350, 150)
        self.setWindowTitle("信号与槽：连接滑块LCD")


if __name__ == '__main__':
    app = QApplication(sys.argv)
    form = WinForm()
    form.show()
    sys.exit(app.exec_())

 多窗口数据传递：调用属性

PyQt提供了一些标准的对话框类，用于输入数据、修改数据、更改应用的设置等，常见的有QFileDialog、QInputDialog、QColorDialog、QFontDialog等。在不同的窗口之间传参有两种常用的方式：一种是在自定义对话框之间通过属性传参；另一种是在窗口之间使用信号与槽机制传参。

代码示例

主窗口  CallDialogMainWin.py

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from DateDialog import DateDialog


class WinForm(QWidget):
    def __init__(self, parent=None):
        super(WinForm, self).__init__(parent)
        self.resize(400, 90)
        self.setWindowTitle('对话框关闭时返回值给主窗口例子')

        self.lineEdit = QLineEdit(self)
        self.button1 = QPushButton('弹出对话框1')
        self.button1.clicked.connect(self.onButton1Click)

        self.button2 = QPushButton('弹出对话框2')
        self.button2.clicked.connect(self.onButton2Click)

        gridLayout = QGridLayout()
        gridLayout.addWidget(self.lineEdit)
        gridLayout.addWidget(self.button1)
        gridLayout.addWidget(self.button2)
        self.setLayout(gridLayout)

    def onButton1Click(self):
        dialog = DateDialog(self)
        result = dialog.exec_()
        date = dialog.dateTime()
        self.lineEdit.setText(date.date().toString())
        print('\n日期对话框的返回值')
        print('date=%s' % str(date.date()))
        print('time=%s' % str(date.time()))
        print('result=%s' % result)
        dialog.destroy()

    def onButton2Click(self):
        date, time, result = DateDialog.getDateTime()
        self.lineEdit.setText(date.toString())
        print('\n日期对话框的返回值')
        print('date=%s' % str(date))
        print('time=%s' % str(time))
        print('result=%s' % result)
        if result == QDialog.Accepted:
            print('点击确认按钮')
        else:
            print('点击取消按钮')


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

子窗口    DateDialog.py

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


class DateDialog(QDialog):
    def __init__(self, parent=None):
        super(DateDialog, self).__init__(parent)
        self.setWindowTitle('DateDialog')

        # 在布局中添加部件
        layout = QVBoxLayout(self)
        self.datetime = QDateTimeEdit(self)
        self.datetime.setCalendarPopup(True)
        self.datetime.setDateTime(QDateTime.currentDateTime())
        layout.addWidget(self.datetime)

        # 使用两个button(ok和cancel)分别连接accept()和reject()槽函数
        buttons = QDialogButtonBox(
            QDialogButtonBox.Ok | QDialogButtonBox.Cancel,
            Qt.Horizontal, self)
        buttons.accepted.connect(self.accept)
        buttons.rejected.connect(self.reject)
        layout.addWidget(buttons)

    # 从对话框中获取当前日期和时间
    def dateTime(self):
        return self.datetime.dateTime()

    # 静态方法创建对话框并返回 (date, time, accepted)
    @staticmethod
    def getDateTime(parent=None):
        dialog = DateDialog(parent)
        result = dialog.exec_()
        date = dialog.dateTime()
        return (date.date(), date.time(), result == QDialog.Accepted)

多窗口数据传递：信号与槽

代码示例

主窗口：CallDialogMainWin2.py

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from DateDialog2 import DateDialog


class WinForm(QWidget):
    def __init__(self, parent=None):
        super(WinForm, self).__init__(parent)
        self.resize(400, 90)
        self.setWindowTitle('信号与槽传递参数的示例')

        self.open_btn = QPushButton('获取时间')
        self.lineEdit_inner = QLineEdit(self)
        self.lineEdit_emit = QLineEdit(self)
        self.open_btn.clicked.connect(self.openDialog)

        self.lineEdit_inner.setText('接收子窗口内置信号的时间')
        self.lineEdit_emit.setText('接收子窗口自定义信号的时间')

        grid = QGridLayout()
        grid.addWidget(self.lineEdit_inner)
        grid.addWidget(self.lineEdit_emit)

        grid.addWidget(self.open_btn)
        self.setLayout(grid)

    def openDialog(self):
        dialog = DateDialog(self)
        '''连接子窗口的内置信号与主窗口的槽函数'''
        dialog.datetime_inner.dateTimeChanged.connect(self.deal_inner_slot)
        '''连接子窗口的自定义信号与主窗口的槽函数'''
        dialog.Signal_OneParameter.connect(self.deal_emit_slot)
        dialog.show()

    def deal_inner_slot(self, date):
        self.lineEdit_inner.setText(date.toString())


    def deal_emit_slot(self, dateStr):
        self.lineEdit_emit.setText(dateStr)



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

子窗口：DateDialog2.py

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


class DateDialog(QDialog):
    Signal_OneParameter = pyqtSignal(str)

    def __init__(self, parent=None):
        super(DateDialog, self).__init__(parent)
        self.setWindowTitle('子窗口：用来发射信号')

        # 在布局中添加部件
        layout = QVBoxLayout(self)

        self.label = QLabel(self)
        self.label.setText('前者发射内置信号\n后者发射自定义信号')

        self.datetime_inner = QDateTimeEdit(self)
        self.datetime_inner.setCalendarPopup(True)
        self.datetime_inner.setDateTime(QDateTime.currentDateTime())

        self.datetime_emit = QDateTimeEdit(self)
        self.datetime_emit.setCalendarPopup(True)
        self.datetime_emit.setDateTime(QDateTime.currentDateTime())

        layout.addWidget(self.label)
        layout.addWidget(self.datetime_inner)
        layout.addWidget(self.datetime_emit)

        # 使用两个button(ok和cancel)分别连接accept()和reject()槽函数
        buttons = QDialogButtonBox(
            QDialogButtonBox.Ok | QDialogButtonBox.Cancel,
            Qt.Horizontal, self)
        buttons.accepted.connect(self.accept)
        buttons.rejected.connect(self.reject)
        layout.addWidget(buttons)

        self.datetime_emit.dateTimeChanged.connect(self.emit_signal)

    def emit_signal(self):
        date_str = self.datetime_emit.dateTime().toString()
        self.Signal_OneParameter.emit(date_str)