pango markup_markup公式_markup用法

Pango is "the core text and font handling library used in GNOME applications. It has extensive support for the different writing systems used throughout the world.". The end of this section points to some standard documentation of Pango that should help you walk through most of what you want to do. We will simply discuss a few representative examples to help you get started in using Pango to display text in your activity.

Pango is built upon several other technologies, most notably gtk and Cairo. So to get pango working, you have to do a little coordinating between all of these players.

The diagram below explains the general relationship. Sugar and GTK arrange and control basic UI widgets (labels, notebooks, drawing areas, scroll bars, pull down menus, etc.). On top of these widgets, you can create Cairo and Pango contexts that coordinate the rendering of graphics and text respectively. Pango is built on top of Cairo, which is a general purpose graphics rendering library. Pango is specialized for text.

File:Pango-architecture.jpg

Given this broad architecture, text rendered through Pango requires a UI widget where the text will show up and then a Cairo context that will be used to help do the graphics rendering needed by Pango. The code below shows how I first create an extension of a gtk.DrawingArea class that will be the UI widget where our Pango text will display. This widget, which I call TextWidget, can then be placed somewhere in the larger gtk/sugar UI (we put it on the first page of the main notebook widget for our activity).

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