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PyQt5 控件学习(一个一个学习之QLineEdit)

输入控件描述:

它主要是用来采集用户的信息,例如,姓名,账号,密码等等......

而且,采集的方式多样!

QLineEdit继承图:

 

QLineEdit描述:

注意,它主要是单行的纯文本(相对纯文本有富文本(带有超链接,html样式等等))

QLineEdit继承:

 它是继承自QWidget 这个很基础的类的,所以它可以使用绝大多数的功能!

QLineEdit功能作用:

1,QLineEdit功能作用之控件的创建:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("QLineEdit的学习")
window.resize(500,500)

############################lineEdit 的创建###############################
#1
# lineEdit = QLineEdit(window)
#2
# lineEdit = QLineEdit("hello world",window)
#3
lineEdit = QLineEdit(window)
lineEdit.setText("hello world")

############################lineEdit 的创建###############################



#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

2,QLineEdit功能作用之文本的设置和获取:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("QLineEdit的学习")
window.resize(500,500)

lineEdit = QLineEdit(window)

############################文本的设置和获取###############################
#1
#设置文本
lineEdit.setText("hello ")



#插入 文本  (它是在光标之后插入)

btn = QPushButton(window)
btn.setText("按钮")
btn.move(100,100)

btn.pressed.connect(lambda :lineEdit.insert("I learn Python"))
#2
#获取文本  获取的是真实的内容
print(lineEdit.text())


#3
#获取用户看到的内容
print(lineEdit.displayText())  #例如加密的时候这里看到的就是*****

############################文本的设置和获取###############################

#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

案例:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("QLineEdit的学习")
window.resize(500,500)

############################案例###############################
lineEdit_1 = QLineEdit(window)
lineEdit_1.move(100,100)

lineEdit_2 = QLineEdit(window)
lineEdit_2.move(100,200)

copy_btn = QPushButton(window)
copy_btn.setText("复制")
copy_btn.move(100,300)

# copy_btn.pressed  和 copy_btn.clicked
#二者不完全一样, pressed 是按下即可,  clicked 是按下加松开
def copy_btn_slot():
    content = lineEdit_1.text()

    lineEdit_2.setText(content)


copy_btn.pressed.connect(copy_btn_slot)


############################案例###############################



#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

3,QLineEdit功能作用之输出模式:

主要指的是以何种方式展示文本!

echo 输出的意思

补充:Python中的枚举值是类属性,一般都是在相应类的文档的最下面,我们通过类名来访问类属性。

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("QLineEdit的学习")
window.resize(500,500)

lineEdit= QLineEdit(window)

############################输出模式###############################
#1
# NoEcho
lineEdit.setEchoMode(QLineEdit.NoEcho)  # 不展示输入的内容
#下面是验证是否真的输入

btn  =  QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.pressed.connect(lambda :print(lineEdit.text()))
#它加密强度更强,一个都不显示!!! 用的比较少而已
#2
# Normal  默认的明文显示
#3
#passwd 密文显示
#这时如果用 displayText() 输入的时候就是用户真实看到的实心圆。
#4
# PassWordEchoOnEdit
# 输入时是明文,输入完成变为密文,  它的应用场景比较常见

#5
#获取输出模式:
# print(lineEdit.echoMode())    # 1代指的是NoEcho


############################输出模式###############################





#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys,time

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QLineEdit 输出模式的案例")
        self.resize(400,400)
        self.set_ui()

    def set_ui(self):
        self.account_lineEdit = QLineEdit(self)
        self.pwd_lineEdit = QLineEdit(self)
        self.pwd_lineEdit.setEchoMode(QLineEdit.Password )
        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.btn_slot)

    def btn_slot(self):
        account = self.account_lineEdit.text()
        pwd = self.pwd_lineEdit.text()



############################两种判断方式,第一种正着来,第二种反着来################################

        #一般建议第二种方式写,因为第二种的可读性好


        #1
        # if account == "zcb":
        #     if pwd == "zcb123":
        #         print("登录成功")
        #     else:
        #         print("密码错误")
        #         self.pwd_lineEdit.setText("")  #清空密码框
        #         self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
        # else:
        #     print("账号错误 ")
        #     self.account_lineEdit.setText("")  #清空
        #     self.pwd_lineEdit.setText("") #清空
        #     self.account_lineEdit.setFocus()  # 让输入框重新获得焦点

        #2
        if account != "zcb":
            print("账号错误 ")
            self.account_lineEdit.setText("")  #清空
            self.pwd_lineEdit.setText("") #清空
            self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None   # 让它立马返回
        if pwd != "zcb123":
            print("密码错误")
            self.pwd_lineEdit.setText("")  #清空密码框
            self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None    # 让它立马返回
        print("登录成功")


############################两种判断方式,第一种正着来,第二种反着来################################





    def resizeEvent(self, event):
        widget_w = 150
        widget_h = 30
        widget_h_margin = 10
        top_margin = 50

        self.account_lineEdit.resize(widget_w,widget_h)

        self.pwd_lineEdit.resize(widget_w,widget_h)

        self.btn.setText("登   录")
        self.btn.resize(widget_w,widget_h)

        x = (self.width() - widget_w)/2
        y1 = top_margin
        y2 = y1 + widget_h +widget_h_margin
        y3 = y2 + widget_h +widget_h_margin

        self.account_lineEdit.move(x,y1)
        self.pwd_lineEdit.move(x,y2)
        self.btn.move(x,y3)

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

案例优化:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys,time

class AccountTool:
    SUCCESS = 0
    ACCOUNT_ERROR = 1
    PWD_ERROR = 2
    #真实的开发中,应该是将账号和密码发送给服务器,等待服务器返回
    # @staticmethod
    # @classmethod

    def check_login(self,account,pwd):
        if account != "zcb":
            return AccountTool.ACCOUNT_ERROR

        if pwd != "zcb123":
            return AccountTool.PWD_ERROR
        return AccountTool.SUCCESS


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QLineEdit 输出模式的案例")
        self.resize(400,400)
        self.set_ui()

    def set_ui(self):
        self.account_lineEdit = QLineEdit(self)
        self.pwd_lineEdit = QLineEdit(self)
        self.pwd_lineEdit.setEchoMode(QLineEdit.Password )
        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.btn_slot)

    def btn_slot(self):
        account = self.account_lineEdit.text()
        pwd = self.pwd_lineEdit.text()

############################优化代码###############################
        state = AccountTool.check_login(account,pwd)
        if state == AccountTool.ACCOUNT_ERROR:
            print("账号错误 ")
            self.account_lineEdit.setText("")  #清空
            self.pwd_lineEdit.setText("") #清空
            self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None   # 让它立马返回
        if state == AccountTool.PWD_ERROR:
            print("密码错误")
            self.pwd_lineEdit.setText("")  #清空密码框
            self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None    # 让它立马返回
        if state == AccountTool.SUCCESS:
            print("登录成功")

############################优化代码###############################




############################两种判断方式,第一种正着来,第二种反着来################################

        #一般建议第二种方式写,因为第二种的可读性好


        #1
        # if account == "zcb":
        #     if pwd == "zcb123":
        #         print("登录成功")
        #     else:
        #         print("密码错误")
        #         self.pwd_lineEdit.setText("")  #清空密码框
        #         self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
        # else:
        #     print("账号错误 ")
        #     self.account_lineEdit.setText("")  #清空
        #     self.pwd_lineEdit.setText("") #清空
        #     self.account_lineEdit.setFocus()  # 让输入框重新获得焦点

        #2
        # if account != "zcb":
        #     print("账号错误 ")
        #     self.account_lineEdit.setText("")  #清空
        #     self.pwd_lineEdit.setText("") #清空
        #     self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
        #     return None   # 让它立马返回
        # if pwd != "zcb123":
        #     print("密码错误")
        #     self.pwd_lineEdit.setText("")  #清空密码框
        #     self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
        #     return None    # 让它立马返回
        # print("登录成功")


############################两种判断方式,第一种正着来,第二种反着来################################





    def resizeEvent(self, event):
        widget_w = 150
        widget_h = 30
        widget_h_margin = 10
        top_margin = 50

        self.account_lineEdit.resize(widget_w,widget_h)

        self.pwd_lineEdit.resize(widget_w,widget_h)

        self.btn.setText("登   录")
        self.btn.resize(widget_w,widget_h)

        x = (self.width() - widget_w)/2
        y1 = top_margin
        y2 = y1 + widget_h +widget_h_margin
        y3 = y2 + widget_h +widget_h_margin

        self.account_lineEdit.move(x,y1)
        self.pwd_lineEdit.move(x,y2)
        self.btn.move(x,y3)

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

不过上面代码有错!

错误在于类中调用的是实例方法(带self),因为我们的目的是直接用类来调用!

这里有几种方案供选择:

1,直接去掉self ,让它成为 自由方法,

2,将self 变为cls  ,但是要加上 @classmethod 使之成为类方法

3,去掉self,但是要加上@staticmethod 使之成为静态方法

 

一般使用自由方法就行! ,方便直接去掉self 就行了

这个优化是非常牛逼的!一定要好好体会!

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys,time

class AccountTool:
    SUCCESS = 0
    ACCOUNT_ERROR = 1
    PWD_ERROR = 2
    #真实的开发中,应该是将账号和密码发送给服务器,等待服务器返回

    def check_login(account,pwd):  # 它是个自由方法
        if account != "zcb":
            return AccountTool.ACCOUNT_ERROR

        if pwd != "zcb123":
            return AccountTool.PWD_ERROR
        return AccountTool.SUCCESS


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QLineEdit 输出模式的案例")
        self.resize(400,400)
        self.set_ui()

    def set_ui(self):
        self.account_lineEdit = QLineEdit(self)
        self.pwd_lineEdit = QLineEdit(self)
        self.pwd_lineEdit.setEchoMode(QLineEdit.Password )
        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.btn_slot)

    def btn_slot(self):
        account = self.account_lineEdit.text()
        pwd = self.pwd_lineEdit.text()

############################优化代码###############################
        state = AccountTool.check_login(account,pwd)
        if state == AccountTool.ACCOUNT_ERROR:
            print("账号错误 ")
            self.account_lineEdit.setText("")  #清空
            self.pwd_lineEdit.setText("") #清空
            self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None   # 让它立马返回
        if state == AccountTool.PWD_ERROR:
            print("密码错误")
            self.pwd_lineEdit.setText("")  #清空密码框
            self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None    # 让它立马返回
        if state == AccountTool.SUCCESS:
            print("登录成功")

############################优化代码###############################




############################两种判断方式,第一种正着来,第二种反着来################################

        #一般建议第二种方式写,因为第二种的可读性好


        #1
        # if account == "zcb":
        #     if pwd == "zcb123":
        #         print("登录成功")
        #     else:
        #         print("密码错误")
        #         self.pwd_lineEdit.setText("")  #清空密码框
        #         self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
        # else:
        #     print("账号错误 ")
        #     self.account_lineEdit.setText("")  #清空
        #     self.pwd_lineEdit.setText("") #清空
        #     self.account_lineEdit.setFocus()  # 让输入框重新获得焦点

        #2
        # if account != "zcb":
        #     print("账号错误 ")
        #     self.account_lineEdit.setText("")  #清空
        #     self.pwd_lineEdit.setText("") #清空
        #     self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
        #     return None   # 让它立马返回
        # if pwd != "zcb123":
        #     print("密码错误")
        #     self.pwd_lineEdit.setText("")  #清空密码框
        #     self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
        #     return None    # 让它立马返回
        # print("登录成功")


############################两种判断方式,第一种正着来,第二种反着来################################





    def resizeEvent(self, event):
        widget_w = 150
        widget_h = 30
        widget_h_margin = 10
        top_margin = 50

        self.account_lineEdit.resize(widget_w,widget_h)

        self.pwd_lineEdit.resize(widget_w,widget_h)

        self.btn.setText("登   录")
        self.btn.resize(widget_w,widget_h)

        x = (self.width() - widget_w)/2
        y1 = top_margin
        y2 = y1 + widget_h +widget_h_margin
        y3 = y2 + widget_h +widget_h_margin

        self.account_lineEdit.move(x,y1)
        self.pwd_lineEdit.move(x,y2)
        self.btn.move(x,y3)

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

4,QLineEdit功能作用之占位提示字符串:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys,time

class AccountTool:
    SUCCESS = 0
    ACCOUNT_ERROR = 1
    PWD_ERROR = 2
    #真实的开发中,应该是将账号和密码发送给服务器,等待服务器返回

    def check_login(account,pwd):  # 它是个自由方法
        if account != "zcb":
            return AccountTool.ACCOUNT_ERROR

        if pwd != "zcb123":
            return AccountTool.PWD_ERROR
        return AccountTool.SUCCESS


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QLineEdit 输出模式的案例")
        self.resize(400,400)
        self.set_ui()

    def set_ui(self):
        self.account_lineEdit = QLineEdit(self)
        self.pwd_lineEdit = QLineEdit(self)
        self.pwd_lineEdit.setEchoMode(QLineEdit.Password )
        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.btn_slot)

        ############################占位字符串的使用###############################
        self.account_lineEdit.setPlaceholderText("请输入账户")
        self.pwd_lineEdit.setPlaceholderText("请输入密码")

        ############################占位字符串的使用###############################


    def btn_slot(self):
        account = self.account_lineEdit.text()
        pwd = self.pwd_lineEdit.text()

        state = AccountTool.check_login(account,pwd)
        if state == AccountTool.ACCOUNT_ERROR:
            print("账号错误 ")
            self.account_lineEdit.setText("")  #清空
            self.pwd_lineEdit.setText("") #清空
            self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None   # 让它立马返回
        if state == AccountTool.PWD_ERROR:
            print("密码错误")
            self.pwd_lineEdit.setText("")  #清空密码框
            self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None    # 让它立马返回
        if state == AccountTool.SUCCESS:
            print("登录成功")


    def resizeEvent(self, event):
        widget_w = 150
        widget_h = 30
        widget_h_margin = 10
        top_margin = 50

        self.account_lineEdit.resize(widget_w,widget_h)

        self.pwd_lineEdit.resize(widget_w,widget_h)

        self.btn.setText("登   录")
        self.btn.resize(widget_w,widget_h)

        x = (self.width() - widget_w)/2
        y1 = top_margin
        y2 = y1 + widget_h +widget_h_margin
        y3 = y2 + widget_h +widget_h_margin

        self.account_lineEdit.move(x,y1)
        self.pwd_lineEdit.move(x,y2)
        self.btn.move(x,y3)

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

 

5,QLineEdit功能作用之清空按钮显示:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys,time

class AccountTool:
    SUCCESS = 0
    ACCOUNT_ERROR = 1
    PWD_ERROR = 2
    #真实的开发中,应该是将账号和密码发送给服务器,等待服务器返回

    def check_login(account,pwd):  # 它是个自由方法
        if account != "zcb":
            return AccountTool.ACCOUNT_ERROR

        if pwd != "zcb123":
            return AccountTool.PWD_ERROR
        return AccountTool.SUCCESS


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QLineEdit 输出模式的案例")
        self.resize(400,400)
        self.set_ui()

    def set_ui(self):
        self.account_lineEdit = QLineEdit(self)
        self.pwd_lineEdit = QLineEdit(self)
        self.pwd_lineEdit.setEchoMode(QLineEdit.Password )
        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.btn_slot)

        self.account_lineEdit.setPlaceholderText("请输入账户")
        self.pwd_lineEdit.setPlaceholderText("请输入密码")


        ############################清空按钮的显示###############################
        self.pwd_lineEdit.setClearButtonEnabled(True)
        ############################清空按钮的显示###############################


    def btn_slot(self):
        account = self.account_lineEdit.text()
        pwd = self.pwd_lineEdit.text()

        state = AccountTool.check_login(account,pwd)
        if state == AccountTool.ACCOUNT_ERROR:
            print("账号错误 ")
            self.account_lineEdit.setText("")  #清空
            self.pwd_lineEdit.setText("") #清空
            self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None   # 让它立马返回
        if state == AccountTool.PWD_ERROR:
            print("密码错误")
            self.pwd_lineEdit.setText("")  #清空密码框
            self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None    # 让它立马返回
        if state == AccountTool.SUCCESS:
            print("登录成功")


    def resizeEvent(self, event):
        widget_w = 150
        widget_h = 30
        widget_h_margin = 10
        top_margin = 50

        self.account_lineEdit.resize(widget_w,widget_h)

        self.pwd_lineEdit.resize(widget_w,widget_h)

        self.btn.setText("登   录")
        self.btn.resize(widget_w,widget_h)

        x = (self.width() - widget_w)/2
        y1 = top_margin
        y2 = y1 + widget_h +widget_h_margin
        y3 = y2 + widget_h +widget_h_margin

        self.account_lineEdit.move(x,y1)
        self.pwd_lineEdit.move(x,y2)
        self.btn.move(x,y3)

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

 

 

6,QLineEdit功能作用之添加操作行为:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys,time

class AccountTool:
    SUCCESS = 0
    ACCOUNT_ERROR = 1
    PWD_ERROR = 2
    #真实的开发中,应该是将账号和密码发送给服务器,等待服务器返回

    def check_login(account,pwd):  # 它是个自由方法
        if account != "zcb":
            return AccountTool.ACCOUNT_ERROR

        if pwd != "zcb123":
            return AccountTool.PWD_ERROR
        return AccountTool.SUCCESS


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QLineEdit 输出模式的案例")
        self.resize(400,400)
        self.set_ui()

    def set_ui(self):
        self.account_lineEdit = QLineEdit(self)
        self.pwd_lineEdit = QLineEdit(self)
        self.pwd_lineEdit.setEchoMode(QLineEdit.Password )
        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.btn_slot)

        self.account_lineEdit.setPlaceholderText("请输入账户")
        self.pwd_lineEdit.setPlaceholderText("请输入密码")


        self.pwd_lineEdit.setClearButtonEnabled(True)

############################添加操作行为###############################
        action = QAction(self.pwd_lineEdit)

        action.setIcon(QIcon("icon/view_off.png"))
        # self.pwd_lineEdit.addAction(action,QLineEdit.LeadingPosition)
        self.pwd_lineEdit.addAction(action,QLineEdit.TrailingPosition)

        def action_triggered_slot():
            if self.pwd_lineEdit.echoMode() == QLineEdit.Normal:
                print("变为密文")
                self.pwd_lineEdit.setEchoMode(QLineEdit.Password)
                action.setIcon(QIcon("icno/view_off.png"))
            else:
                print("变为明文")
                self.pwd_lineEdit.setEchoMode(QLineEdit.Normal)
                action.setIcon(QIcon("icon/view.png"))

        action.triggered.connect(action_triggered_slot)


############################添加操作行为###############################


    def btn_slot(self):
        account = self.account_lineEdit.text()
        pwd = self.pwd_lineEdit.text()

        state = AccountTool.check_login(account,pwd)
        if state == AccountTool.ACCOUNT_ERROR:
            print("账号错误 ")
            self.account_lineEdit.setText("")  #清空
            self.pwd_lineEdit.setText("") #清空
            self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None   # 让它立马返回
        if state == AccountTool.PWD_ERROR:
            print("密码错误")
            self.pwd_lineEdit.setText("")  #清空密码框
            self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None    # 让它立马返回
        if state == AccountTool.SUCCESS:
            print("登录成功")


    def resizeEvent(self, event):
        widget_w = 150
        widget_h = 30
        widget_h_margin = 10
        top_margin = 50

        self.account_lineEdit.resize(widget_w,widget_h)

        self.pwd_lineEdit.resize(widget_w,widget_h)

        self.btn.setText("登   录")
        self.btn.resize(widget_w,widget_h)

        x = (self.width() - widget_w)/2
        y1 = top_margin
        y2 = y1 + widget_h +widget_h_margin
        y3 = y2 + widget_h +widget_h_margin

        self.account_lineEdit.move(x,y1)
        self.pwd_lineEdit.move(x,y2)
        self.btn.move(x,y3)

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

对明文和密文进行切换

7,QLineEdit功能作用之自动补全:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys,time

class AccountTool:
    SUCCESS = 0
    ACCOUNT_ERROR = 1
    PWD_ERROR = 2
    #真实的开发中,应该是将账号和密码发送给服务器,等待服务器返回

    def check_login(account,pwd):  # 它是个自由方法
        if account != "zcb":
            return AccountTool.ACCOUNT_ERROR

        if pwd != "zcb123":
            return AccountTool.PWD_ERROR
        return AccountTool.SUCCESS


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QLineEdit 输出模式的案例")
        self.resize(400,400)
        self.set_ui()

    def set_ui(self):
        self.account_lineEdit = QLineEdit(self)
        self.pwd_lineEdit = QLineEdit(self)
        self.pwd_lineEdit.setEchoMode(QLineEdit.Password )
        self.btn = QPushButton(self)
        self.btn.clicked.connect(self.btn_slot)

        self.account_lineEdit.setPlaceholderText("请输入账户")
        self.pwd_lineEdit.setPlaceholderText("请输入密码")


        self.pwd_lineEdit.setClearButtonEnabled(True)


        action = QAction(self.pwd_lineEdit)

        action.setIcon(QIcon("icon/view_off.png"))
        # self.pwd_lineEdit.addAction(action,QLineEdit.LeadingPosition)
        self.pwd_lineEdit.addAction(action,QLineEdit.TrailingPosition)

        def action_triggered_slot():
            if self.pwd_lineEdit.echoMode() == QLineEdit.Normal:
                print("变为密文")
                self.pwd_lineEdit.setEchoMode(QLineEdit.Password)
                action.setIcon(QIcon("icno/view_off.png"))
            else:
                print("变为明文")
                self.pwd_lineEdit.setEchoMode(QLineEdit.Normal)
                action.setIcon(QIcon("icon/view.png"))

        action.triggered.connect(action_triggered_slot)


        ############################自动补全设置###############################

        completer = QCompleter(["zcb","tom","jack","zach"],self.account_lineEdit)
        self.account_lineEdit.setCompleter(completer)

        ############################自动补全设置###############################





    def btn_slot(self):
        account = self.account_lineEdit.text()
        pwd = self.pwd_lineEdit.text()

        state = AccountTool.check_login(account,pwd)
        if state == AccountTool.ACCOUNT_ERROR:
            print("账号错误 ")
            self.account_lineEdit.setText("")  #清空
            self.pwd_lineEdit.setText("") #清空
            self.account_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None   # 让它立马返回
        if state == AccountTool.PWD_ERROR:
            print("密码错误")
            self.pwd_lineEdit.setText("")  #清空密码框
            self.pwd_lineEdit.setFocus()  # 让输入框重新获得焦点
            return None    # 让它立马返回
        if state == AccountTool.SUCCESS:
            print("登录成功")


    def resizeEvent(self, event):
        widget_w = 150
        widget_h = 30
        widget_h_margin = 10
        top_margin = 50

        self.account_lineEdit.resize(widget_w,widget_h)

        self.pwd_lineEdit.resize(widget_w,widget_h)

        self.btn.setText("登   录")
        self.btn.resize(widget_w,widget_h)

        x = (self.width() - widget_w)/2
        y1 = top_margin
        y2 = y1 + widget_h +widget_h_margin
        y3 = y2 + widget_h +widget_h_margin

        self.account_lineEdit.move(x,y1)
        self.pwd_lineEdit.move(x,y2)
        self.btn.move(x,y3)

if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

 

8,QLineEdit功能作用之输入限制:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("QLineEdit")
window.resize(500,500)

############################middle###############################
widget_w = 150
widget_h = 40
widget_h_margin = 10
top_margin = 30

account_lineEdit = QLineEdit(window)
account_lineEdit.resize(widget_w,widget_h)

pwd_lineEdit = QLineEdit(window)
pwd_lineEdit.resize(widget_w,widget_h)

btn = QPushButton(window)
btn.setText("按钮")
btn.resize(widget_w,widget_h)

x = (window.width() - widget_w)/2
y1 = top_margin
y2 = y1 + widget_h +widget_h_margin
y3 = y2 + widget_h +widget_h_margin

account_lineEdit.move(x,y1)
pwd_lineEdit.move(x,y2)
btn.move(x,y3)

############################middle###############################

############################输入限制###############################
#1  最大长度设置
account_lineEdit.setMaxLength(3)  # 字符个数的限制
print(account_lineEdit.maxLength())  #获取最大长度
#2  设置只读
account_lineEdit.setReadOnly(True)  #设置只读

account_lineEdit.setText("hello ")  #只读是可以用代码来设置的!
print(account_lineEdit.isReadOnly()) #查看是否只读

############################输入限制###############################


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
输入限制和只读设置

首先是规则验证之设置验证器验证

先看关于验证器的内容

QValidator的继承图

它是个抽象类,必须通过继承它才能使用!

验证器的代码:(重点,难点)  限制用户 年龄的输入在18-180 之间!

 1 from PyQt5.Qt import * #刚开始学习可以这样一下导入
 2 import sys
 3 
 4 class AgeValidator(QValidator):
 5     def validate(self, input_str, pos):
 6         print(input_str,pos)
 7         try:
 8             if 18 <= int(input_str) <= 180:
 9                 print(input_str,pos)
10                 return (QValidator.Acceptable,input_str,pos)  #必须返回验证的结果
11             elif 1 <= int(input_str) <= 17:
12                 return (QValidator.Intermediate,input_str,pos)
13             else:
14                 print(input_str,pos)
15                 return (QValidator.Invalid,input_str,pos)  #如果无效的话,就不会显示到文本框中
16         except:
17                 if len(input_str)==0:
18                     return (QValidator.Intermediate,input_str,pos)
19                 return (QValidator.Invalid,input_str,pos)  #如果无效的话,就不会显示到文本框中
20 ###########################################################
21     def fixup(self, p_str):   #当结束编辑的时候回调它,修改的结果也一定要返回
22         print("====",p_str)
23         try:
24             if int(p_str) <18:
25                 return "18"
26         except:
27             return "18"
28     #fixup 主要是用来对应上面的中间状态的!  进行收尾工作
29 
30 ###########################################################
31 
32 class Window(QWidget):
33     def __init__(self):
34         super().__init__()
35         self.setWindowTitle("验证器QValidator的使用")
36         self.resize(400,400)
37         self.set_ui()
38 
39 
40     def set_ui(self):
41         account_lineEdit = QLineEdit(self)
42         account_lineEdit.move(100,100)
43         #18-100
44 
45         validator = AgeValidator()
46         account_lineEdit.setValidator(validator)
47 
48         lineEdit = QLineEdit(self)  #主要是让account_lineEdit 完成编辑状态的
49 
50 
51 if __name__ == '__main__':
52     app =QApplication(sys.argv)
53 
54     window = Window()
55     window.show()
56 
57     sys.exit(app.exec_())
View Code

注意,修复只有一次,当上面的最后是中间状态的话,就会调用fixup() 来最后判断一次!

 

当然,如果我们不自己定义类继承,也可以使用系统提供的它的子类!

例如QIntValidator QDoubleValidator  QRegExpValidator

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("验证器QValidator的使用")
        self.resize(400,400)
        self.set_ui()


    def set_ui(self):
        account_lineEdit = QLineEdit(self)
        account_lineEdit.move(100,100)
        #18-100


        ############################QIntValidator 不过它内部完善的不是很充分,我们可以 在它的基础上进行二次开发###############################
        validator = QIntValidator(18,180)

        account_lineEdit.setValidator(validator)
        ############################QIntValidator 不过它内部完善的不是很充分,我们可以 在它的基础上进行二次开发###############################

        lineEdit = QLineEdit(self)  #主要是让account_lineEdit 完成编辑状态的


if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

但是,它们这些子类有的也是不能满足我们的需求,我们可以在它们的基础上进行二次开发!

这样比起直接使用自己的类继承方便很多!

如下:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys

class MyIntValidator(QIntValidator):
    def fixup(self, p_str):
        print("xxx",p_str)
        if len(p_str) == 0 or int(p_str) <18:
            return "18"

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("验证器QValidator的使用")
        self.resize(400,400)
        self.set_ui()


    def set_ui(self):
        account_lineEdit = QLineEdit(self)
        account_lineEdit.move(100,100)
        #18-100


        ############################QIntValidator 不过它内部完善的不是很充分,我们可以 在它的基础上进行二次开发###############################
        validator = MyIntValidator(18,180)

        account_lineEdit.setValidator(validator)
        ############################QIntValidator 不过它内部完善的不是很充分,我们可以 在它的基础上进行二次开发###############################

        lineEdit = QLineEdit(self)  #主要是让account_lineEdit 完成编辑状态的


if __name__ == '__main__':
    app =QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())
View Code

 

然后是规则验证之掩码验证

首先看什么是掩码:

掩码字符的含义:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()

#设置控件
window.setWindowTitle("掩码")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)

############################设置掩码###############################
#1总共有5位, 左边2 (必须是大写字母) 中间是 -  分隔符 右边两位(必须是数字)

# lineEdit.setInputMask(">AA-99")
#2 设置占位字符
lineEdit.setInputMask(">AA-99;#")

#如果需要占位字符就要用;  后面加上字符即可

############################设置掩码###############################

#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

案例:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()

#设置控件
window.setWindowTitle("掩码")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)

############################设置掩码###############################
#1
# lineEdit.setInputMask("9999-9999999;_")
#2
#设置ip
lineEdit.setInputMask("999.999.999.999; ")
############################设置掩码###############################



#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

9,QLineEdit功能作用之是否被编辑:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)

#2,控件的操作:
#创建控件
window = QWidget()

#设置控件
window.setWindowTitle("掩码")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)

############################是否被编辑###############################
def btn_pressed_slot():
    print(lineEdit.isModified())
    lineEdit.setModified(False)

############################是否被编辑###############################

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.pressed.connect(btn_pressed_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

10,QLineEdit功能作用之光标控制:

要注意区分 光标,鼠标,坐标的区别!

关于光标的常识:

用backspace 是往左删除, 用 delete 是往右删!

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    lineEdit.cursorBackward(False,2)  # 如果是true 就代表移动时选中相关文本
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
cursorBackward
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    lineEdit.cursorForward(False,2)  # 如果是true 就代表移动时选中相关文本
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
cursorForward
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    lineEdit.cursorWordBackward(False)  #True 是选中   单词是按空格区分
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
cursorWordBackward
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    lineEdit.cursorWordForward(False)  #True 是选中   单词是按空格区分
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
cursorWordForward
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    lineEdit.home(False)  # 快速回到行首
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
快速回到行首
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    lineEdit.end(False)  # 快速回到行尾
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
快速回到行尾

移动到指定位置:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    lineEdit.setCursorPosition(len(lineEdit.text())/2)  # 回到中间位置
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

获取指定位置文本的光标位置:

它这个位置是相对于编辑框而言的,而且它只是关注x ,y 不关注。

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
def btn_clicked_slot():
    # print(lineEdit.cursorPosition())  # 获取光标位置
    print(lineEdit.cursorPositionAt(QPoint(55,5)))  #它只关注x 的大小,y 随意
    lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

11,QLineEdit功能作用之文本边距设置:

注意它和在QWidget 中setContentMargins() 的区别:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
lineEdit.resize(200,100)

lineEdit.setStyleSheet("background-color:cyan;")
#之前在QWidget 中学的:
# lineEdit.setContentsMargins(50,0,0,0)  #它这时是控件的可用区域给减少了,

#注意它和下面的区别:
lineEdit.setTextMargins(50,0,0,0)  # 这个只是改变输入的边距




def btn_clicked_slot():
      lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

12,QLineEdit功能作用之对齐方式:

上面我们进行文本边距的设置,不过需要我们计算,可以用这里的对齐方式!

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()


#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
lineEdit.resize(200,100)

lineEdit.setStyleSheet("background-color:cyan;")

#水平靠右  垂直靠下
lineEdit.setAlignment(Qt.AlignRight|Qt.AlignBottom)



def btn_clicked_slot():
      lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)


#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

而且,它可以配合上面的文本边距来配合使用:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()

#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)
lineEdit.resize(200,100)

lineEdit.setStyleSheet("background-color:cyan;")

#水平靠右  垂直靠下
lineEdit.setAlignment(Qt.AlignRight|Qt.AlignBottom)
lineEdit.setTextMargins(0,0,5,5)  #配合使用   让它不太靠角落

def btn_clicked_slot():
      lineEdit.setFocus()

btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)

#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

 

13,QLineEdit功能作用之常用编辑功能:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()

#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)

############################常用编辑功能###############################
#1
# def btn_clicked_slot():
#     lineEdit.backspace()  #向左删除
#     lineEdit.setFocus()
#2
# def btn_clicked_slot():
#     lineEdit.del_()  #向右删除
#     lineEdit.setFocus()
#3
# def btn_clicked_slot():
#     lineEdit.clear()    #清空  相当于设置空字符串
#     lineEdit.setFocus()
#4  复制
# def btn_clicked_slot():
#     lineEdit.cursorBackward(True,3)  # 这里要用代码来模拟
#     lineEdit.copy()  #复制
#     lineEdit.end(False)
#     lineEdit.paste()  #粘贴
#     lineEdit.setFocus()
#5   剪切
# def btn_clicked_slot():
#     lineEdit.cursorBackward(True,3)  # 这里要用代码来模拟
#     lineEdit.cut()  #复制
#     lineEdit.home(False)
#     lineEdit.paste()  #粘贴
#     lineEdit.setFocus()
#6 撤销和重做  undo  redo
#  isUndoAvailable  isRddoAvailable
#7 拖放
# lineEdit2 = QLineEdit(window)
# lineEdit2.setDragEnabled(True)  # 设置可拖放

############################常用编辑功能###############################



btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)

#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

文本选中:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()

#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)

############################常用编辑功能###############################


#8 选中文本:
def btn_clicked_slot():
    # lineEdit.setSelection(2,3)  #从2开始选择3个
    # lineEdit.selectAll()  # 选中全部

    # lineEdit.selectAll()
    # lineEdit.deselect()  #取消选中


    # print(lineEdit.hasSelectedText())


    # lineEdit.selectAll()
    # print(lineEdit.selectedText())
    # 
    # print(lineEdit.selectionStart())
    # print(lineEdit.selectionEnd())
    # print(lineEdit.selectionLength())

############################常用编辑功能###############################



btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
btn.clicked.connect(btn_clicked_slot)

#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
View Code

 

QLineEdit信号:

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
#1,创建app
app  = QApplication(sys.argv)


#2,控件的操作:
#创建控件
window = QWidget()

#设置控件
window.setWindowTitle("光标")
window.resize(500,500)

lineEdit = QLineEdit(window)
lineEdit.move(100,100)

############################信号###############################
#1
#textEdited 信号
# lineEdit.textEdited.connect(lambda val:print("编辑",val))

#2
#textChanged 信号
# lineEdit.textEdited.connect(lambda val:print("内容变化",val))
# 1 和 2 的区别是,1 是针对用户用键盘编辑的时候触发,而2是只要是内容变化就触发
#3
#returnPressed 信号
#按回车键触发
# lineEdit.returnPressed.connect(lambda :print("回车被按"))


#需求,按回车将焦点定位到下面的输入框
# lineEdit2  = QLineEdit(window)
# lineEdit2.move(100,150)
# lineEdit.returnPressed.connect(lambda :lineEdit2.setFocus())

#4,editingFinished 信号
# lineEdit.editingFinished.connect(lambda :print("结束编辑")) #它和按下回车键有些区别

#5,cursorPositionChanged  信号
# lineEdit.cursorPositionChanged.connect(lambda oldPos,newPos :print(oldPos,newPos))

#6,selectionChanged 信号
lineEdit.selectionChanged.connect(lambda :print("选中文本发生变化",lineEdit.selectedText()))


############################信号###############################


btn = QPushButton(window)
btn.setText("按钮")
btn.move(0,300)
# btn.clicked.connect(btn_clicked_slot)

#展示控件
window.show()

#3,进入消息循环
sys.exit(app.exec_())
信号

总结:

以上就是关于单行纯文本输入,下面是多行纯文本的输入!https://www.cnblogs.com/zach0812/p/11376877.html

 

posted @ 2019-08-19 14:24  Zcb0812  阅读(1335)  评论(0编辑  收藏  举报