OOUI/Toolbars

Toolbars
Toolbars are complex interface components that permit users to easily access a variety of tools (e.g., formatting commands) and actions, which are additional commands that are part of the toolbar, but not configured as tools.

Developers create and customize the individual tools, which are then registered with a tool factory, which creates the tools on demand. Each tool has a symbolic name (used when registering the tool), a title (e.g., ‘Insert picture’), and an icon.

Individual tools are organized in tool groups, which are displayed as menus of tools, lists of tools, or as a single bar of tools. The arrangement and order of the tool groups is customized when the toolbar is set up. Tools can be presented in any order, but each can only appear once in the toolbar.

The following is an example of a basic toolbar. We will be looking more closely at each of the components making up this example later in this documentation. To see this demo live, please see the code-generated documentation.

Tools
Tools are created by extending the abstract Tool class or one of its subclasses, PopupTool or ToolGroupTool. Each tool must be configured with a static name, title, and icon property: In addition to the static properties, tools must also specify the following two methods:
 * name: The static name is used internally to register the tool with a ToolFactory. Tools must be registered with a tool factory before they can be used in a toolbar.
 * title: The title text is used in different ways depending on the type of group the tool is placed inside (ToolBarGroup, ToolMenuGroup, or ToolListGroup). For ‘bar’ groups, where only an icon is displayed to identify the tool, the title text is used as a tooltip that is displayed when a user moves the mouse over the tool. For ‘list’ groups, the title text is used to identify the tool in the dropdown menus used in the user interface. If a keyboard shortcut has been defined for the tool, the shortcut will automatically be displayed. For tools in ‘bar’ and ‘list’ groups, the keyboard shortcut is displayed in a tooltip; for tools in ‘menu’ groups, the shortcut appears to the right of each menu item.
 * icon: The icon is also used in different ways depending on the type of group that the tool is inside. For ‘bar’ groups, the icon is displayed in the toolbar to identify the tool. For ‘list’ groups, the icon is displayed beside the title text in the dropdown menu. For ‘menu’ groups, the icon is ignored.
 * onSelect, used to specify the action the tool will carry out when it is selected


 * onUpdateState, used to synchronize the state of the tool with the state of its larger context. For example, this method could be used to select the ‘bold’ tool in the toolbar when the text cursor is moved inside an area of bolded text.

For a complete list of supported methods and configuration options, please see the code-level documentation for the Tool class.

PopupTool
Popup tools open a popup window when they are selected from the toolbar. Unlike standard tools, popup tools do not require that developers specify an onSelect or onUpdateState method, as these methods have been implemented already.

For a complete list of supported methods and configuration options, please see the code-level documentation for the PopupTool class.

ToolGroupTool
A ToolGroupTool is a special sort of tool that can contain other tools and tool groups. The ToolGroupTool was specifically designed to be used inside a ‘bar’ tool group to provide access to additional tools from the bar item. With a little additional customization, it can also be used to create hierarchical menus of tools. The ToolGroupTool can also be used to create a hierarchical menu: For a complete list of supported methods and configuration options, please see the code-level documentation for the ToolGroupTool class.

ToolGroups
Tools are organized into tool groups, which are created by a ToolGroupFactory and then added to the toolbar when the toolbar is set up. Individual tools can be added to any type of group (bar, list, or menu). The type of group determines how the included tools are arranged in the toolbar:
 * bar: Tools are displayed by icon in a single row.
 * list: Tools are displayed by title and icon in a dropdown menu. The list can be configured to be collapsed and expanded with the allowCollapse config.
 * menu: Tools are displayed by value in a dropdown menu. ‘menu’ tool groups are generally used for sets of mutually exclusive tools, such as a group of text formatting commands (paragraph, heading, etc).

Tools can be added to a tool group in one of several ways: by symbolic name, by group name, or with the ' * ' (asterisk) catch-all:

Developers can further curate the arrangement of the tools using the tool group’s promote and demote configuration options, which will arrange the tools at the top of the tool list (or front of the toolbar) or end, respectively. These settings are particularly useful when tools have been added to the toolbar en masse (e.g., with the asterisk catch-all or when a group of tools is added to another group) to manage their priority.

BarToolGroup
Tools in a BarToolGroup are displayed by icon in a single row. The title of the tool is displayed when users move the mouse over the tool. For a complete list of supported methods and configuration options, please see the code-level documentation for the BarToolGroup class.

ListToolGroup
Tools in a ListToolGroup are displayed by icon and title in a dropdown menu. List groups can be configured to be expanded and collapsed. Collapsed lists will have a ‘More’ option that users can select to see the full list of tools. If a collapsed group is expanded, a ‘Fewer’ option permits users to collapse the list again.

Use the allowCollapse config to designate tools as collapsible (‘help’ and ‘stuff’, in the following example). By default, the list opens in its collapsed state, and users must click the 'More' option to see the collapsed tools:

To display a collapsible list in its expanded state instead of its collapsed one, set the expanded config to ‘true’: Alternatively, you may wish to specify the names of tools that should never be collapsed. This is done with the forceExpand config. In the following example, only the ‘help’ tool has been designated as expanded; all other tools are collapsed by default.

For a complete list of supported methods and configuration options, please see the code-level documentation for the ListToolGroup class.

Adding shadows
Documentation for toolbars is currently under construction. In the meantime, for more information, please see:
 * code-generated documentation for OO.ui.Toolbar, which has an annotated example of a simple toolbar
 * The OOjs UI demo, which has additional examples (see the source)