python GUI库图形界面开发之PyQt5信号与槽多窗口数据传递详细使用方法与实例

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
class WinForm(QWidget):
  def __init__(self):
    super(WinForm, self).__init__()
    self.initUI()
  def initUI( self ):
    #先创建水平滑块和Lcd控件
    lcd=QLCDNumber(self)
    slider=QSlider(Qt.Horizontal,self)
    #垂直布局，添加控件
    vbox=QVBoxLayout()
    vbox.addWidget(lcd)
    vbox.addWidget(slider)
    #设置窗口布局
    self.setLayout(vbox)
    #设置滑块数值信号改变连接Lcd的更新
    slider.valueChanged.connect(lcd.display)
    #设置初始位置以及初始大小，设置标题
    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_())

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
class DateDialog(QDialog):
  def __init__(self,parent=None):
    super(DateDialog, self).__init__(parent)
    self.setWindowTitle('DateDialog')
    #在布局中添加控件
    layout=QVBoxLayout(self)
    self.datetime=QDateTimeEdit(self)
    self.datetime.setCalendarPopup(True)
    self.datetime.setDateTime(QDateTime.currentDateTime())
    layout.addWidget(self.datetime)
    buttons=QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel,Qt.Horizontal,self)
    buttons.accepted.connect(self.accept)
    buttons.rejected.connect(self.reject)
    layout.addWidget(buttons)
  def dateTime( self ):
    return self.datetime.dateTime()
  @staticmethod
  def getDateTime(parent=None):
    dialog=DateDialog(parent)
    result=dialog.exec_()
    date=dialog.dateTime()
    return (date.date(),date.time(),result==QDialog.Accepted)

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from jia_13多窗口数据传递之调用属性 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的例子')
    self.lineEdit=QLineEdit(self)
    self.button1=QPushButton('弹出对话框1')
    self.button1.clicked.connect(self.onButton1Clicked)
    self.button2=QPushButton('弹出对话框2')
    self.button2.clicked.connect(self.onButton2Clicked)
    gridLayout=QGridLayout(self)
    gridLayout.addWidget(self.lineEdit)
    gridLayout.addWidget(self.button1)
    gridLayout.addWidget(self.button2)
  def onButton1Clicked( 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)
  def onButton2Clicked( 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 __name__ == '__main__':
  app=QApplication(sys.argv)
  form=WinForm()
  form.show()
  sys.exit(app.exec_())

# -*- coding: utf-8 -*-
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)

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from jia_14多窗口信号传递之信号与槽 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_())