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| Provides support for shared UI resources such as menus, |
| tool bars, and status lines. |
| <h2> |
| Package Specification</h2> |
| Contribution managers coordinate contributions to shared UI resources such |
| as menus, menu bars, tool bars, and status lines. <tt>ContributionManager</tt> |
| maintains the contributions as a dynamic list of contribution items (<tt>IContributionItems</tt>). |
| Separators (<tt>Separator</tt>) can be included in contribution lists to |
| break up the list's visual representation. Internally, contribution lists |
| can be organized into named groups via special group markers (<tt>GroupMarker</tt>) |
| to facilitate programatic insertion at specific positions within the list. |
| <p>Three specific contribution managers are provided: a status line manager |
| (<tt>StatusLineManager</tt>), a tool bar manager (<tt>ToolBarManager</tt>), |
| and a hierarchical menu manager (<tt>MenuManager</tt>). |
| <p>Actions (<tt>IAction</tt>) are commands which can be triggered from |
| the UI, like the ones found in menus, toolbars, and buttons. Menus and |
| tools bars are typically populated with contribution items that delegate |
| to actions (<tt>ActionContributionItem</tt>). |
| <p>Note: None of the classes in this package maintain global state. |
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