Python JLabel.revalidate方法代码示例

# 需要导入模块: from javax.swing import JLabel [as 别名]
# 或者: from javax.swing.JLabel import revalidate [as 别名]

#.........这里部分代码省略.........
	##  Event driven function to retrieve and send data to the server
	
	def grabText(self, event): 
		'''Function to repeatedly grab new messages entered into the text 
		area and display them in the main text area. Resets the entry area
		'''
		#  Grab the text from the text area
		text=self.message.getText()
		#  Don't allow an empty string through
		if text=='':
			return
		text=text.strip()
		#  Call the append text function
		self.appendText('\nYou : '+text+'\n', self.username)
		#  Reset the text to be empty and grab focus so that it is ready for new text input
		self.message.requestFocusInWindow()
		self.message.setText('')
		#  Send the message to the server
		data=text.encode()
		self.tn.write(data+'\r\n')

	##  Function to handle appending of messages
	
	def appendText(self, message, user=None):
		'''This function takes care of appending any new messages to the content area
		'''
		message_label=JTextArea(message,2,3, font=self.label_2_font)
		#  If this is a message from the grab text function, create a new label, assign it's colours
		if user!=None:
			message_label.setBackground(Color(240,240,240))
			message_label.setForeground(Color(129,129,129))
		#  Otherwise set the format for receive function (no user passed in)	
		else:
			message_label.setBackground(Color(215,215,215))
			message_label.setForeground(Color(40,153,153))
		
		#  Format and style options for the new message labels	
		message_label.setEditable(False)
		message_label.setLineWrap(True)
		message_label.setWrapStyleWord(True)
		message_label.setBorder(BorderFactory.createLineBorder( Color(247,246,242),4))
		#  Sets the positioning of messages
		self.main_content.setCaretPosition(self.main_content.getDocument().getLength())
		doc = self.main_content.getStyledDocument()
		attr=SimpleAttributeSet()
		self.main_content.insertComponent(message_label)
		# Essential for jtextarea to be able to stack message
		doc.insertString( self.main_content.getDocument().getLength(),'\n ', attr)
		# Not sure if needed
		self.main_content.repaint()
		
		###  This is a late edit so it isn't included in the documentation. Basically trying to dynamically update the number
		###  of users label at runtime. Works for incrementing the value but not decrementing it.
		
		print(message)
		#  Only split the message if there are enough values to split (greeting messages differ in format to chat messages)
		try:
			user, text=message.split(' : ')
		except:
			return
			
		#print('Split values are %s %s'%(user, text))
		user=str(user.strip())
		#print(self.no_users)
		#print(user+' : '+text)
		#  If the user already in the list, pass
		if user in self.no_users:
			if text == ('User %s amach sa teach !'%user):
				self.no_users.remove(user)
				print('User % removed'%user)
			
		else:
			#print('User %s not in list'%user)
			if str(user) == 'You':
				#print('User is equal to "You"')
				return 
			self.no_users.append(user)
			print('User appended')
			self.number_users=len(self.no_users)
			#print('Length of user list is '+str(self.number_users))
	
		self.user_label2=JLabel(" Users online : %s "%str(len(self.no_users)),JLabel.RIGHT, font=self.label_2_font)
		#print('Label created')
		#print('Attempt to replace label')
		self.client_layout.replace(self.user_label, self.user_label2) 
		self.user_label = self.user_label2
		self.user_label.repaint()
		self.user_label.revalidate()
		print('Label updated')
	
	##  Function to control return button press in message field

	def returnKeyPress(self,event):
		'''This function creates an object for return key press when inside the message entry area,
		creates an object of KeyAdapter and tests keycode for a match, responds with grab text callback		
		'''
		key_object=Key()
		key_value=key_object.keyPressed(event)
		if key_value == 10:
			self.grabText(event)