4.4文本框类控件

4.4.1QLineEdit

QLineEdit类是一个单行文本框控件，可以输入单行字符串。
如果需要输入多行字符申，则使用QTextEdit类。

定义输入掩码的字符，表4-5中列出了输入掩码的占位符和字面字符，并说明其如何控制数据输入。

掩码由掩码字符和分隔符字符串组成，后面可以跟一个分号和空白字符，空白字符在编辑后会从文本中删除的。掩码示例如表4-6所示。


EchoMode的显示效果

from PyQt5.QtWidgets import QApplication,  QLineEdit , QWidget ,  QFormLayout
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")

		# 设置显示效果
		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_())

输入掩码

from PyQt5.QtWidgets import QApplication,  QLineEdit , QWidget ,  QFormLayout
import sys  

class lineEditDemo(QWidget):
	def __init__(self, parent=None):
		super(lineEditDemo, self).__init__(parent)
		self.setWindowTitle("QLineEdit的输入掩码例子")

		flo = QFormLayout()          		
		pIPLineEdit = QLineEdit()
		pMACLineEdit = QLineEdit()
		pDateLineEdit = QLineEdit()
		pLicenseLineEdit = QLineEdit()		

		pIPLineEdit.setInputMask("000.000.000.000;_")
		pMACLineEdit.setInputMask("HH:HH:HH:HH:HH:HH;_")
		pDateLineEdit.setInputMask("0000-00-00")
		pLicenseLineEdit.setInputMask(">AAAAA-AAAAA-AAAAA-AAAAA-AAAAA;#")

		flo.addRow("数字掩码", pIPLineEdit)
		flo.addRow("Mac掩码", pMACLineEdit)
		flo.addRow("日期掩码", pDateLineEdit)
		flo.addRow("许可证掩码", pLicenseLineEdit)
        
		#pIPLineEdit.setPlaceholderText("111")
		#pMACLineEdit.setPlaceholderText("222")
		#pLicenseLineEdit.setPlaceholderText("333")
		#pLicenseLineEdit.setPlaceholderText("444")
		      		                    
		self.setLayout(flo)                        
   
if __name__ == "__main__":       
	app = QApplication(sys.argv)
	win = lineEditDemo()	
	win.show()	
	sys.exit(app.exec_())

QLienEdit标签控件的综合示例

from PyQt5.QtWidgets import QApplication,  QLineEdit , QWidget ,  QFormLayout
from PyQt5.QtGui import QIntValidator , QDoubleValidator , QFont
from PyQt5.QtCore import Qt
import sys  

class lineEditDemo(QWidget):
	def __init__(self, parent=None):
		super(lineEditDemo, self).__init__(parent)
		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))
		flo = QFormLayout()
		flo.addRow("integer validator", e1)
		flo.addRow("Double validator",e2)
		e3 = QLineEdit()
		e3.setInputMask('+99_9999_999999')
		flo.addRow("Input Mask",e3)
		e4 = QLineEdit()
		e4.textChanged.connect( self.textchanged )
		flo.addRow("Text changed",e4)
		e5 = QLineEdit()
		e5.setEchoMode( QLineEdit.Password )
		flo.addRow("Password",e5)
		e6 = QLineEdit("Hello PyQt5")
		e6.setReadOnly(True)
		flo.addRow("Read Only",e6 )
		e5.editingFinished.connect( self.enterPress )
		self.setLayout(flo)
		self.setWindowTitle("QLineEdit例子")
	
	def textchanged(self, text):
		print( "输入的内容为: "+text )

	def enterPress( self ):
		print( "已输入值" )

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

第1个文本框e1，显示文本使用自定义字体、右对齐、允许输入整数。
第2个文本框e2，限制输入小数点后两位。
第3个文本框e3，需要一个输入掩码应用于电话号码。
第4个文本框e4，需要发射信号textChanged,连接到槽函数textchanged()。
第5个文本框e6,设置显示模式EchoMode为Password,需要发射editingfinished信号连接到槽函数enterPress()，一旦用户按下了回车键，该函数就会被执行。
第6个文本框e6，显示一个默认的文本，不能编辑，设置为只读的。

QTextEdit

QTextEdit类是一个多行文本框控件，可以显示多行文本内容，当文本内容超出控件显示范围时，可以显示水平个垂直滚动条。
QTextEdit不仅可以显示文本还可以显示HTML文档。

from PyQt5.QtWidgets import QApplication,  QWidget ,  QTextEdit, QVBoxLayout , QPushButton
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("显示文本")
		self.btnPress2 = QPushButton("显示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点击按钮")

	def btnPress2_Clicked(self):
		self.textEdit.setHtml("<font color='red' size='6'><red>Hello PyQt5!\n点击按钮。</font>")
		
if __name__ == "__main__":       
	app = QApplication(sys.argv)
	win = TextEditDemo()	
	win.show()	
	sys.exit(app.exec_())