Motif and Common Desktop Environment: Style Guide Certification Checklist Migration Version

Motif and CDE 2.1 Style Guide Certification Checklist

Warning Signal

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Provide a warning signal when the user types a character that is not supported as input for a text-entry field that has focus. For example, if a text-entry field supports only numeric characters, provide a warning signal when the user types a letter.

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Provide a warning signal when the user types a character that cannot be used as a mnemonic at the active cursor position or the control on which the cursor is positioned does not accept text input. For example, if mnemonics are supported but no choice has L assigned as the mnemonic, provide a warning signal when the user presses the L key.

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Use a warning signal to supplement a message. Note that in degraded environments, a message may occur in sensory modalities other than the standard visual on-screen mode. See Chapter 12 for more information.

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If the user has turned off a warning signal option for the operating environment and a situation arises in which the system would normally generate that warning signal, do not generate a warning signal. For example, if the user has turned off audible signals for the operating environment, do not generate an audible signal when an action message is displayed.