pango markup_markup公式_markup用法(2)

In this structure, most of the meaty code is in the expose_cb() method, which is called when an "expose_event" signal is sent out.

import gtk

from gtk import gdk
import cairo
import pango

class TextWidget(gtk.DrawingArea):

	def __init__(self):
		
		gtk.DrawingArea.__init__(self)
		self.context = None

		#create a pango layout. Leave text argument to be empty string since we want to use markup
		self.pango_context = self.create_pango_context()
		self.pango_layout = self.create_pango_layout('')
		
		#Use pango markup to set the text within the pango layout
		self.pango_layout.set_markup('<span foreground=\"blue\">This is some sample markup</span> <sup>text</sup> that <u>is displayed with pango</u>')

		#Make sure to detect and handle the expose_event signal so you can always
		#redraw the pango layout as appropriate. 
		self.connect("expose_event", self.expose_cb)
		self.set_size_request(450, -1)


	#The expose method is automatically called when the widget
	#needs to be redrawn
	def expose_cb(self, widget, event):
		
		#create a CAIRO context (to use with pango)
		self.context = widget.window.cairo_create()

		#Show the pango_layout in the Cairo context just created. 
		self.context.show_layout(self.pango_layout)

Below is the code we put in our initial class that will create the larger UI for the activity. Note how we create a sugar.graphics.notebook.Notebook object as the main container for the "stuff" in our activity. Then we populate this notebook with more UI widget. The one widget of interest for us is the TextWidget object that is placed on the first page of the activity.

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