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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"><title>Migrating from old menu and toolbar systems to GtkAction</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="GTK+ Reference Manual"><link rel="up" href="migrating.html" title="Part IV. Migrating from Previous Versions of GTK+"><link rel="prev" href="gtkfilechooser-new-features.html" title="New features"><link rel="next" href="ui-manager.html" title="User Interface Manager Object"><meta name="generator" content="GTK-Doc V1.9 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="part" href="gtk.html" title="Part I. GTK+ Overview"><link rel="part" href="gtkbase.html" title="Part II. GTK+ Core Reference"><link rel="part" href="gtkobjects.html" title="Part III. GTK+ Widgets and Objects"><link rel="chapter" href="ch01.html" title="Object Hierarchy"><link 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border="0" alt="Prev"></a></td><td><a accesskey="u" href="migrating.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GTK+ Reference Manual</th><td><a accesskey="n" href="ui-manager.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="gtk-migrating-GtkAction"></a>Migrating from old menu and toolbar systems to GtkAction</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Federico</span> <span class="surname">Mena-Quintero</span></h3><div class="affiliation"><div class="address"><p><br>   <code class="email"><<a class="email" href="mailto:federicoximian.com">federico<em class="parameter"><code>ximian.com</code></em></a>></code><br> </p></div></div></div></div></div></div><div class="toc"><dl><dt><span class="section"><a href="gtk-migrating-GtkAction.html#actions-and-action-groups">Actions and Action Groups</a></span></dt><dt><span class="section"><a href="ui-manager.html">User Interface Manager Object</a></span></dt><dt><span class="section"><a href="migrating-gnomeuiinfo.html">Migrating from GnomeUIInfo</a></span></dt></dl></div><p> Prior to GTK+ 2.4, there were several APIs in use to create menus and toolbars. GTK+ itself included <a class="link" href="GtkItemFactory.html" title="GtkItemFactory"><span class="type">GtkItemFactory</span></a>, which was historically used in the GIMP; libgnomeui provided the gnome-ui set of macros; libbonoboui provided a complex mechanism to do menu merging across embedded components. GTK+ 2.4 includes a system for creating menus and toolbars, with merging of items, based around the <a class="link" href="GtkAction.html" title="GtkAction"><span class="type">GtkAction</span></a> mechanism. </p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="actions-and-action-groups"></a>Actions and Action Groups</h2></div></div></div><p> A <a class="link" href="GtkAction.html" title="GtkAction"><span class="type">GtkAction</span></a> represents an operation that the user can perform from the menus and toolbars of an application. It is similar to "verbs" in other menu systems. A <a class="link" href="GtkAction.html" title="GtkAction"><span class="type">GtkAction</span></a> has a name, which is its identifier, and it can have several widgets that represent it in the user interface. For example, an action for <span class="symbol">EditCopy</span> can have a menu item as well as a toolbar button associated to it. If there is nothing selected in the document, the application can simply de-sensitize the <span class="symbol">EditCopy</span> action; this will cause both the menu item and the toolbar button to be de-sensitized automatically. Similarly, whenever the user selects the menu item or the toolbar button associated to the <span class="symbol">EditCopy</span> action, the corresponding <a class="link" href="GtkAction.html" title="GtkAction"><span class="type">GtkAction</span></a> object will emit an "activate" signal. </p><p> <a class="link" href="GtkActionGroup.html" title="GtkActionGroup"><span class="type">GtkActionGroup</span></a> is simply a group of <a class="link" href="GtkAction.html" title="GtkAction"><span class="type">GtkAction</span></a> objects. An application may want to have several groups: one for global actions such as "new document", "about", and "exit"; then one group for each open document with actions specific to the document, such as "cut", "copy", "paste", and "print". </p><p> Normal actions are simply commands, such as <span class="symbol">FileSave</span> or <span class="symbol">EditCopy</span>. Toggle actions can be active or inactive, such as <span class="symbol">FormatBold</span> or <span class="symbol">ViewShowRulers</span>. Radio actions define a set of items for which one and only one can be active at a time, for example, { <span class="symbol">ViewHighQuality</span>, <span class="symbol">ViewNormalQuality</span>, <span class="symbol">ViewLowQuality</span> }. </p></div></div></body></html>⌨️ 快捷键说明
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