【PyQt5-2】文本框

案例1、label應用

# -*- coding: UTF-8 -*-
from PyQt5.QtWidgets import QApplication,QLabel,QWidget,QVBoxLayout
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPixmap,QPalette
import sys

class WindowDemo(QWidget):
    def __init__(self):
        super().__init__()

        label1 = QLabel(self)
        label2 = QLabel(self)
        label3 = QLabel(self)
        label4 = QLabel(self)

        #初始化標籤控件
        label1.setText("這是一個文本標籤")
        label1.setAutoFillBackground(True)
        palette = QPalette()
        palette.setColor(QPalette.Window,Qt.blue)
        label1.setPalette(palette)
        label1.setAlignment(Qt.AlignCenter)

        label2.setText("<a href='#'>歡迎使用Python GUI應用</a>")

        label3.setAlignment(Qt.AlignCenter)
        label3.setToolTip("這是一個圖片標籤")
        label3.setPixmap(QPixmap("./images/2.jpg"))

        label4.setText("<A href='http://www.baidu.com'>歡迎訪問百度</a>")
        label4.setAlignment(Qt.AlignRight)
        label4.setToolTip("這是一個超鏈接標籤")

        #2在窗口布局中添加控件
        vbox = QVBoxLayout()
        vbox.addWidget(label1)
        vbox.addStretch()
        vbox.addWidget(label2)
        vbox.addStretch()
        vbox.addWidget(label3)
        vbox.addStretch()
        vbox.addWidget(label4)

        #3允許label1訪問超鏈接
        label1.setOpenExternalLinks(True)
        label4.setOpenExternalLinks(True)
        #點擊文本框綁定槽事件
        label4.linkActivated.connect( self.link_clicked )
        #劃過文本框綁定槽事件
        label2.linkHovered.connect(self.link_hovered)
        label1.setTextInteractionFlags(Qt.TextSelectableByMouse)

        self.setLayout(vbox)
        self.setWindowTitle("QLabel例子")

    def link_hovered(self):
        print("當鼠標劃過label2時，觸發事件")

    def link_clicked(self):
        print("當鼠標點擊label4時，觸發事件")

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

案例2、label的夥伴設置

# -*- coding: UTF-8 -*-
from PyQt5.QtWidgets import *
import sys

class QlabelDemo(QDialog):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("QLabel例子")
        nameLb1 = QLabel("&Name",self)
        nameEd1 = QLineEdit(self)
        nameLb1.setBuddy(nameEd1)

        nameLb2 = QLabel("&Password", self)
        nameEd2 = QLineEdit(self)
        nameLb2.setBuddy(nameEd2)

        btnOk = QPushButton("&OK")
        btnCancel = QPushButton("&Cancel")
        mainLayout = QGridLayout(self)
        mainLayout.addWidget(nameLb1,0,0)
        mainLayout.addWidget(nameEd1,0,1,1,2)

        mainLayout.addWidget(nameLb2,1,0)
        mainLayout.addWidget(nameEd2,1,1,1,2)

        mainLayout.addWidget(btnOk,2,1)
        mainLayout.addWidget(btnCancel,2,2)

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

案例3、lineEdit

from PyQt5.QtWidgets import *
import sys

class lineEditDemo(QWidget):
    def __init__(self,parent=None):
        super(lineEditDemo,self).__init__(parent)
        self.setWindowTitle("QLineEdit例子")

        flo = QFormLayout()
        pNormalLineEdit = QLineEdit()
        pNoEchoLineEdit = QLineEdit()
        pPasswordLineEdit = QLineEdit()
        pPasswordEchoOnEditLineEdit = QLineEdit()

        flo.addRow("Normal",pNormalLineEdit)
        flo.addRow("NoEcho", pNoEchoLineEdit)
        flo.addRow("Password",pPasswordLineEdit )
        flo.addRow("PasswordEchoOnEdit", pPasswordEchoOnEditLineEdit)

        pNormalLineEdit.setPlaceholderText("Normal")
        pNoEchoLineEdit.setPlaceholderText("NoEcho")
        pPasswordLineEdit.setPlaceholderText("Password")
        pPasswordEchoOnEditLineEdit.setPlaceholderText("PasswordEchoOnEdit")

        pNormalLineEdit.setEchoMode(QLineEdit.Normal)
        pNoEchoLineEdit.setEchoMode(QLineEdit.NoEcho)
        pPasswordLineEdit.setEchoMode(QLineEdit.Password)
        pPasswordEchoOnEditLineEdit.setEchoMode(QLineEdit.PasswordEchoOnEdit)

        self.setLayout(flo)

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

案例4、格式化LineEdit

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

class lineEditDemo(QWidget):
    def __init__(self,parent=None):
        super(lineEditDemo,self).__init__(parent)
        self.setWindowTitle("QLineEdit例子")

        e1 = QLineEdit()
        e1.setValidator(QIntValidator())
        e1.setMaxLength(4)
        e1.setAlignment(Qt.AlignRight)
        e1.setFont(QFont("Arial",20))

        e2 = QLineEdit()
        e2.setValidator(QDoubleValidator(0.99,99.99,2))

        e3 = QLineEdit()
        e3.setInputMask("+99_999_999999")

        e4 = QLineEdit()
        e4.textChanged.connect(self.textchanged)

        e5 = QLineEdit()
        e5.setEchoMode(QLineEdit.Password)
        e5.editingFinished.connect(self.enterPress)

        e6 = QLineEdit("Hello PyQt5")
        e6.setReadOnly(True)

        flo = QFormLayout()
        flo.addRow("integer validator",e1)
        flo.addRow("Double validator",e2)
        flo.addRow("Input Mask", e3)
        flo.addRow("Text changed", e4)
        flo.addRow("Password", e5)
        flo.addRow("Read Only", e6)

        self.setLayout(flo)

    def textchanged(self,text):
        print("輸入內容："+text)

    def enterPress(self):
        print("已輸入值")

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

案例5、多行文本框QTextEdit

from PyQt5.QtWidgets import *
import sys

class textEditDemo(QWidget):
    def __init__(self,parent=None):
        super(textEditDemo,self).__init__(parent)
        self.setWindowTitle("QTextEdit 例子")

        self.resize(300,270)
        self.textEdit = QTextEdit()
        self.btnPress1 = QPushButton("顯示文本")
        self.btnPress2 = QPushButton("顯示HTML")

        layout = QVBoxLayout()
        layout.addWidget(self.textEdit)
        layout.addWidget(self.btnPress1)
        layout.addWidget(self.btnPress2)
        self.setLayout(layout)

        self.btnPress1.clicked.connect(self.btnPress1_clicked)
        self.btnPress2.clicked.connect(self.btnPress2_clicked)

    def btnPress1_clicked(self):
        self.textEdit.setPlainText("Hello PyQt5!\n單擊按鈕")
    def btnPress2_clicked(self):
        self.textEdit.setHtml("<font color='red' size='6'><red>Hello PyQt5!\n單擊按鈕</font>")

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