A context menu is a list of functions or options (respectively menu items) available to users in the current context. A submenu or cascading menu is a secondary menu displayed on demand from within a menu.
Menus are normally hidden from view (except menu bars) and drop down when users right-click an object or window region that supports a context menu. They are an efficient means of conserving screen space, therefore.
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- Provide a context menu for inherent functions. For instance, functions that have only keyboard access like 'Copy' and 'Paste' for textual controls, or standard functions like 'Forward' and 'Backward in case of navigation.
- Use context menus for well known functions only.
- Do not use context menus as the only way to start a function. Always have a redundant access.
- Do not put more than 10 items within a single level of a menu. Add separators between logical groups within a menu. Organize the menu items into groups of seven or fewer strongly related items.
- If appropriate, use an access button to make contextual menu functionality easier to access.
- Place the most frequently used items at the top of the menu.
- Avoid combining actions and attributes in the same group.
- Use submenus cautiously. Submenus add complexity to the interface and are physically more difficult to use, so you should take care not to overuse them.
- Do not change labels of menu item dynamically.
- Choose single word names for menu categories. Using multiple words makes the separation between categories confusing.
- Disable menu items that don't apply to the current context, instead of removing them.
- Hide menu items completely if they are permanently unavailable on the user's system (e.g. due to missing hardware capabilities or missing optional dependencies).
- Assign shortcut keys to the most frequently used menu items (Ctrl+<Key>). For well-known shortcut keys, use standard assignments. Use function keys for commands that have a small-scale effect (F2 = Rename) and ctrl key for large-scale effect (Ctrl+S = Save).
- Indicate a function that needs additional information (including a confirmation) by adding an ellipsis at the end of the label (e.g. Save as…).
- Provide menu item icons for the most commonly used menu items.
- Turning on an item in the menu should always enable the option. Negative options create a double negative which can be confusing. For example, use 'Show hidden files' instead of 'Hide hidden files'.
- Do not use compound words (e.g. ToolOptions), and hyphens (e.g. Tool-Options) in label names; they make words harder to read and recognize.
- Prefer verb-based menu names; Avoid generic, unhelpful verbs, such as 'Change' and 'Manage'.
- Use singular nouns for commands that apply to a single object, otherwise use plural nouns.
- For pairs of complementary commands, choose clearly complementary names. Examples: Add/Remove; Show/Hide; Insert/Delete.
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