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Windows Phone 8 : Range Controls (part 1) - ProgressBar

1/18/2015 8:18:29 PM
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The RangeBase control is an abstract class that represents a control that oversees a numeric value that falls between a minimum and a maximum value. Windows Phone provides three RangeBase controls: the ProgressBar, ScrollBar, and Slider (see Figure 1).

Image

FIGURE 1 RangeBase controls.

The RangeBase control provides various range related properties and events for monitoring its Value property (see Table 1).

TABLE 1. Properties of the RangeBase Class

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Note

If the Value property is set to a value outside the range defined by the Minimum and Maximum properties, no Exception is raised. Instead the Value property is coerced and set to either the Minimum or Maximum value.

However, setting Minimum, Maximum, Value, SmallChange, or LargeChange to NaN, NegativeInfinity, or PositiveInfinity raises an ArgumentException. In addition, setting SmallChange or LargeChange to a value less than zero raises an ArgumentException.

ProgressBar

During time-consuming operations, it is important to provide an indication to the user that your application is busy, while still remaining responsive. The ProgressBar serves this purpose. It is not interactive; the user cannot modify it directly, and it is able to work in two modes: determinate and indeterminate.

Determinate mode allows you to display a value indicating the amount of work completed relative to the amount of work remaining, allowing the user to estimate how long the remainder of the operation will take. If the IsIndeterminate property is not specified, the control defaults to determinate.

Progress is displayed by setting the Value property of the control to the amount of work completed, and the Maximum property to the total amount of work to be performed. There is also a Minimum property that allows you to set a base point and can be useful when a portion of the work has already been completed.

The noninteractive nature of the control means that the Value property is updated from code, or via a data binding, while performing a background operation.

Alternatively, when progress of an operation cannot be monitored, or the total duration of an operation is unknown, the ProgressBar’s indeterminate mode can be engaged.


Best Practice

If the total amount of work required by an activity is known and progress can be periodically determined, avoid using an indeterminate ProgressBar. Use instead a determinate ProgressBar. Providing clear feedback about how long a user can expect to wait for completion of an operation improves the user’s experience.


When using the indeterminate mode by setting the IsIndeterminate property to true, the control is displayed as a series of animated dots.


Note

In previous versions of the Windows Phone SDK, the ProgressBar had a performance issue. This issue has been resolved in the Windows Phone 8 SDK.


 
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