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Another good solution to the validation control problem is the clue box. This little pop-up window looks and behaves just like a ToolTip (but could be made distinguishable from a ToolTip by background color). Its function is to explain the range of acceptable data for a validation control, either active or passive. Whereas a ToolTip appears when the cursor sits for a moment on a control, a clue box would appear as soon as the control detects an invalid character (it might also display unilaterally just like a ToolTip if the cursor sits unmoving on the field for a second or so). If a user enters, for example, a non-numeric character in a numeric-only field, the program would put up a clue box near the point of the offending entry, yet without obscuring it. It would say, for example, 0 9. Short, terse, but very effective. Yes, the user is rejected, but he is not also ignored. The clue box also works for passive validation, as shown in Figure 21-19.

Source IP address Destination IP adress Protocol number in IP header Source port, or range of ports Destination port, or range of ports DSCP marking ICMP code ICMP type Fragmentation

Figure 21-19 The ToolTip idiom is so effective that it could easily be extended to other uses. Instead of yellow ToolTips offering fly-over labels for butcons, we could have pink ones offering fly-over hints for unbounded edit fields. These clue boxes could also help eliminate error message boxes. In this example, if a user enters a value lower than allowable, the program could replace the entered value with the lowest allowable value and display the cluebox that modelessly explains the reason for the substitution. The user can enter a new value or accept the minimum without being stopped by an error dialog.

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each filter policy is assigned a unique filter ID and is defined with the following information: Scope Default action (such as accept or discard) Description (explain what the filter is for) At least one filter entry (the actual matching criteria)

Typically, an edit field is used to enter a numeric value needed by the program, such as the point size of a font. A user can enter anything he wants, from 5 to 500, and the field will accept it and return the value to the owning program. If a user enters garbage, the control must make some kind of decision. In Microsoft Word, for example, if you enter asdf as a font point size, the program issues an error message box informing you: This is not a valid number. It then reverts the size to its previous value. The error dialog is rather silly, but the summary rejection of my meaningless input is perfectly appropriate. But what if you had keyed in the value nine The program rejects it with the same curt error message box. If instead the control were programmed to think of itself as a numeric entry control, it could perhaps behave better. It doesn t bother me if the program converts the nine into a 9, but it certainly is incorrect when it says that nine is not a valid number. Without a doubt, it is valid, and the program has put its foot in its mouth.

The only parameter that is not straightforward is scope The scope indicates whether the policy can be used only once or can be used many times If the scope of the policy is exclusive, it can be applied to only a single entity (Service Access Point (SAP) or interface) If the scope is template, it can be applied to multiple entities (SAPs or interfaces) For each filter policy, there can be numerous filter entries, but the policy must have at least one entry This makes sense because it is the filter entries that determine the permit/deny actions of the policy It would make little sense to have a policy with no matching criteria For each filter entry, you must configure: Match criteria (IP address source or destination, upper-layer protocol, upper-layer protocol port, etc.

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It s nice when a text edit control is smart enough to recognize appropriate units. For example, if a program is requesting a measurement, and a user enters 5i or 5in or 5 inches, the control should not only report the result as five, but it should report inches as well. If a user enters 5mm, the control should report it as five millimeters. SketchUp, an elegant architectural sketching application, supports this type of feedback. Similarly, well-designed financial analytics applications should know that 5mm means five million. Say that the field is requesting a column width. A user can enter either a number or a number and an indicator of the measurement system as described above. Users could also be allowed to enter the word default and the program would set the column width to the default value for the program. A user could alternately enter

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