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Access keys or mnemonics are another Windows standard (they are also seen in some Unix GUIs) for adding keystroke commands in parallel to the direct manipulation of menus and dialogs. The Microsoft style guide covers access keys and accelerators in detail, so we will simply stress that they should not be overlooked. Mnemonics are accessed using the Alt key, arrow keys, and the underlined letter in a menu item or title. Pressing the Alt key places the application into mnemonic mode, and the arrow keys can be used
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Part III: Designing Interaction Details
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to navigate to the appropriate menu. After it opens, pressing the appropriate letter key executes the function. The main purpose of mnemonics is to provide a keyboard equivalent of each menu command. For this reason, mnemonics should be complete, particularly for text-oriented programs. Don t think of them as a convenience so much as a pipeline to the keyboard. Keep in mind that your most experienced users will rely heavily on their keyboards; so to keep them loyal, ensure that the mnemonics are consistent and thoroughly thought out. Mnemonics are not optional.
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Most of the preceding discussion is based in pattern and convention for traditional desktop software platforms. Of course, things change a bit when you consider other platforms. On devices such as mobile phones and palmtops, menus must often be relied upon as a primary command vector. While applications on handhelds typically do provide some functions in the form of buttons, due to screen real-estate limitations, toolbars and more direct idioms are not always possible, so the only way to provide access to the vast majority of functions is through a menu system. PalmOS and Windows Mobile feature drop-down menus much like those found on modern desktop GUIs, complete with accelerators. This is, by and large, a useful translation, but it s worth considering that some idioms don t work as well with smaller screens, styluses, and four-way rocker switches. First of all, cascading menus are to be avoided at all costs. It is next to impossible to fit two adjacent open menus on the screen, and having one overlay another can cause serious confusion and dislocation for a mobile user. Second, due to space constraints, it may not be feasible to include icons on menus, despite the fact that they may be of great utility to a walking user who may find an icon easier to identify than a word. Mobile phones and other small-screened devices (such as blood glucose meters) are typically even a generation behind drop-down menus and provide interaction idioms much in the vein of the sequential hierarchical menu (which you ll recall from earlier in the chapter). When designing for such a platform, you have little to work with, so every decision really counts. In applications where choices are mapped to the numeric keypad (and some choices may be relegated to the More submenu), it is of utmost importance to make sure the most frequently used functions are mapped to the number keys. Similarly, the sequence of functions should provide both cognitive guidance (by locating similar functions next to each other) and the most commonly used functions at the top of the list. Notes
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1. Mitchell, J., & Shniederman, B., 1989
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Ubiquitous, toolbars are actually a relatively recent GUI development. Unlike so many GUI idioms that were popularized on the Apple Macintosh, Microsoft was the first to introduce these to mainstream user interfaces. An important complement to a menu system, the toolbar has proven to be an effective mechanism for providing persistent, direct access to functions. Whereas menus are complete toolsets with the main purpose of teaching, toolbars are for frequently used commands and offer little help to new users. In this chapter, we ll discuss the merits and shortcomings of the toolbar command idiom. We ll also talk about ToolTips and toolbar variants such as the ribbon.
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