谷歌浏览器的源码分析 6

这个输入框的自动完成的功能，是比较智能化的。因为它会根据以往的输入自动完成，或者智能提示所需要的连接或者内容。

下面就来先看这个类的定义：

#001  // Provides the implementation of an edit control with a drop-down

#002  // autocomplete box. The box itself is implemented in autocomplete_popup.cc

#003  // This file implements the edit box and management for the popup.

#004  //

#005  // This implementation is currently appropriate for the URL bar, where the

#006  // autocomplete dropdown is always displayed because there is always a

#007  // default item. For web page autofill and other applications, this is

#008  // probably not appropriate. We may want to add a flag to determine which

#009  // of these modes we‘re in.

#010  class AutocompleteEdit

#011      : public CWindowImpl<AutocompleteEdit,

#012                           CRichEditCtrl,

#013                           CWinTraits<WS_CHILD | WS_VISIBLE | ES_AUTOHSCROLL |

#014                                      ES_NOHIDESEL> >,

#015        public CRichEditCommands<AutocompleteEdit>,

#016        public Menu::Delegate {

类AutocompleteEdit继承了类CWindowImpl、类CRichEditCommands、类Menu::Delegate。其中类CWindowImpl实现了Windows窗口，它是WTL里的窗口模板类，主要用来创建窗口界面类，并且使用类CRichEditCtrl作为基类，类CRichEditCtrl主要调用Windows里的编辑类。类CRichEditCommands实现RichEdit的命令功能。Menu::Delegate类是实现智能下拉式菜单的提示界面。因此，要学习开发chrome，需要先学习WTL的开发，它是一套基于模板的窗口框架。下一次再仔细地分析自动完成的实现过程。