No.4 PyQt学习（页面跳转）
2024-10-15 22:07:20
先定义了两个MainWindow进行跳转，但发现这样的话，从第二个Window无法跳转会第一个。代码如下：
# -*- coding: utf-8 -*-
import sys from PyQt4.QtGui import *
from PyQt4.QtCore import *
import MainPage class Home(QMainWindow): def __init__(self):
super(Home, self).__init__()
#QtGui.QWidget.__init__(self)
self.style = """
QPushButton{background-color:grey;color:white;}
#window{ background-image: url(background1.jpg); }
"""
self.setStyleSheet(self.style)
self.initUI() def initUI(self): self.resize(650, 480)
self.statusBar().showMessage('Ready')
self.setObjectName("window")
self.setWindowFlags(Qt.FramelessWindowHint | Qt.Dialog)
self.center() widget = QWidget()
label = QLabel()
label.setText("<font size=%s><B>%s</B></font>" %("", "Face Recognition System"))
start = QPushButton("Start", self)
widget.setStatusTip(' ')
#start.resize(50, 25)
quit = QPushButton("Quit", self)
#quit.resize(50,25)
start.clicked.connect(self.startClicked)
quit.clicked.connect(self.quitClicked) vbox1 = QVBoxLayout() # 垂直布局
vbox2 = QVBoxLayout()
vbox3 = QVBoxLayout()
vbox4 = QVBoxLayout() #两边空隙填充
label1 = QLabel()
label1.resize(50,50)
label2 = QLabel()
label2.resize(50, 50)
vbox1.addWidget(label1)
#vbox2.addWidget(label)
vbox4.addWidget(start)
vbox4.addWidget(quit)
vbox3.addWidget(label2)
# 按钮两边空隙填充
label3 = QLabel()
label3.resize(50, 50)
label4 = QLabel()
label4.resize(50, 50)
hbox1 = QHBoxLayout()
hbox1.addWidget(label3)
hbox1.addLayout(vbox4)
hbox1.addWidget(label4)
#标题与两个按钮上下协调
label5 = QLabel()
label5.resize(1, 1)
label6 = QLabel()
label6.resize(1, 1)
label7 = QLabel()
label7.resize(1, 1)
vbox2.addWidget(label5)
vbox2.addWidget(label)
vbox2.addWidget(label6)
vbox2.addLayout(hbox1)
vbox2.addWidget(label7) hbox = QHBoxLayout()
hbox.addLayout(vbox1)
hbox.addLayout(vbox2)
hbox.addLayout(vbox3)
widget.setLayout(hbox) self.setCentralWidget(widget) def mousePressEvent(self, event):
if event.button() == Qt.LeftButton:
self.dragPosition = event.globalPos() - self.frameGeometry().topLeft()
QApplication.postEvent(self, QEvent(174))
event.accept() def mouseMoveEvent(self, event):
if event.buttons() == Qt.LeftButton:
self.move(event.globalPos() - self.dragPosition)
event.accept() def quitClicked(self):
reply = QMessageBox.question(self, 'Warning',
'Are you sure to quit?', QMessageBox.Yes,
QMessageBox.No)
if reply == QMessageBox.Yes:
quit() def startClicked(self):
self.hide()
self.ui = MainPage.MainPage() #必须将另一个界面改为成员变量，负责MainPage会与函数调用周期一样一闪而过
self.ui.show() def center(self):
qr = self.frameGeometry() # 得到该主窗口的矩形框架qr
cp = QDesktopWidget().availableGeometry().center() # 屏幕中间点的坐标cp
qr.moveCenter(cp) # 将矩形框架移至屏幕正中央
self.move(qr.topLeft()) # 应用窗口移至矩形框架的左上角点 def main():
app = QApplication(sys.argv)
main = Home()
main.show()
sys.exit(app.exec_()) if __name__ == '__main__':
main()
第二个窗口代码为：
# -*- coding: utf-8 -*-
import sys from PyQt4.QtGui import *
from PyQt4.QtCore import * try:
_fromUtf8 = QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s try:
_encoding = QApplication.UnicodeUTF8 def _translate(context, text, disambig):
return QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QApplication.translate(context, text, disambig) class MainPage(QMainWindow):
def __init__(self):
super(MainPage, self).__init__()
self.style = """
QPushButton{background-color:grey;color:white;}
#window{ background-image: url(background1.jpg); }
"""
self.setStyleSheet(self.style)
self.initUI() def initUI(self):
self.resize(650, 480)
self.setObjectName("window")
self.setWindowFlags(Qt.FramelessWindowHint | Qt.Dialog)
self.center()
back = QPushButton("Back", self)
back.setGeometry(190, 210,50, 25)
back.clicked.connect(self.backClicked) def backClicked(self):
self.close() def center(self):
qr = self.frameGeometry() # 得到该主窗口的矩形框架qr
cp = QDesktopWidget().availableGeometry().center() # 屏幕中间点的坐标cp
qr.moveCenter(cp) # 将矩形框架移至屏幕正中央
self.move(qr.topLeft()) # 应用窗口移至矩形框架的左上角点 if __name__ == "__main__":
app = QApplication(sys.argv)
ui = MainPage()
ui.show()
sys.exit(app.exec_())
截图如下：
点击start至第二个界面，点击back无法返回第一个页面。
修改代码，可以实现两个页面的互相跳转：
Page1：
# -*- coding: utf-8 -*-
import sys from PyQt4.QtGui import *
from PyQt4.QtCore import *
import MainPage class Home(QMainWindow): def __init__(self):
super(Home, self).__init__()
#QtGui.QWidget.__init__(self)
self.style = """
QPushButton{background-color:grey;color:white;}
#window{ background-image: url(background1.jpg); }
"""
self.setStyleSheet(self.style)
self.initUI() def initUI(self): self.resize(650, 480)
self.statusBar().showMessage('Ready')
self.setObjectName("window")
self.setWindowFlags(Qt.FramelessWindowHint | Qt.Dialog)
self.center() widget = QWidget()
label = QLabel()
label.setText("<font size=%s><B>%s</B></font>" %("", "Face Recognition System"))
start = QPushButton("Start", self)
widget.setStatusTip(' ')
#start.resize(50, 25)
quit = QPushButton("Quit", self)
#quit.resize(50,25)
start.clicked.connect(self.startClicked)
quit.clicked.connect(self.quitClicked) vbox1 = QVBoxLayout() # 垂直布局
vbox2 = QVBoxLayout()
vbox3 = QVBoxLayout()
vbox4 = QVBoxLayout() #两边空隙填充
label1 = QLabel()
label1.resize(50,50)
label2 = QLabel()
label2.resize(50, 50)
vbox1.addWidget(label1)
#vbox2.addWidget(label)
vbox4.addWidget(start)
vbox4.addWidget(quit)
vbox3.addWidget(label2)
# 按钮两边空隙填充
label3 = QLabel()
label3.resize(50, 50)
label4 = QLabel()
label4.resize(50, 50)
hbox1 = QHBoxLayout()
hbox1.addWidget(label3)
hbox1.addLayout(vbox4)
hbox1.addWidget(label4)
#标题与两个按钮上下协调
label5 = QLabel()
label5.resize(1, 1)
label6 = QLabel()
label6.resize(1, 1)
label7 = QLabel()
label7.resize(1, 1)
vbox2.addWidget(label5)
vbox2.addWidget(label)
vbox2.addWidget(label6)
vbox2.addLayout(hbox1)
vbox2.addWidget(label7) hbox = QHBoxLayout()
hbox.addLayout(vbox1)
hbox.addLayout(vbox2)
hbox.addLayout(vbox3)
widget.setLayout(hbox) self.setCentralWidget(widget) def mousePressEvent(self, event):
if event.button() == Qt.LeftButton:
self.dragPosition = event.globalPos() - self.frameGeometry().topLeft()
QApplication.postEvent(self, QEvent(174))
event.accept() def mouseMoveEvent(self, event):
if event.buttons() == Qt.LeftButton:
self.move(event.globalPos() - self.dragPosition)
event.accept() def quitClicked(self):
reply = QMessageBox.question(self, 'Warning',
'Are you sure to quit?', QMessageBox.Yes,
QMessageBox.No)
if reply == QMessageBox.Yes:
quit() def startClicked(self):
self.hide()
Form = QDialog()
ui = MainPage.MainPage(Form)
Form.show()
Form.exec_()
self.show() def center(self):
qr = self.frameGeometry() # 得到该主窗口的矩形框架qr
cp = QDesktopWidget().availableGeometry().center() # 屏幕中间点的坐标cp
qr.moveCenter(cp) # 将矩形框架移至屏幕正中央
self.move(qr.topLeft()) # 应用窗口移至矩形框架的左上角点 def main():
app = QApplication(sys.argv)
main = Home()
main.show()
sys.exit(app.exec_()) if __name__ == '__main__':
main()
Page2：
# -*- coding: utf-8 -*-
import sys from PyQt4.QtGui import *
from PyQt4.QtCore import * try:
_fromUtf8 = QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s try:
_encoding = QApplication.UnicodeUTF8 def _translate(context, text, disambig):
return QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QApplication.translate(context, text, disambig) class MainPage(QMainWindow):
def __init__(self, Dialog):
super(MainPage, self).__init__()
self.initUI(Dialog) def initUI(self, Dialog):
Dialog.resize(650, 480)
self.form = Dialog
self.form.setObjectName("window")
self.form.setStyleSheet ("background-image: url(background1.jpg)");
self.form.setWindowFlags(Qt.FramelessWindowHint | Qt.Dialog) back = QPushButton("Back", Dialog)
back.setGeometry(190, 210, 50, 25)
back.clicked.connect(self.backClicked) def backClicked(self):
self.form.close() if __name__ == "__main__":
app = QApplication(sys.argv)
Dialog = QDialog()
ui = MainPage(Dialog)
ui.show()
sys.exit(app.exec_())
参考：http://blog.csdn.net/sollor525/article/details/40076395
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