DeviceStatus Events

,

While DeviceStatus allows you to retrieve device information, it also includes the following two events:

Image KeyboardDeployedChanged

Image PowerSourceChanged

If the phone device has a hardware keyboard, such as a sliding keyboard, the KeyboardDeployedChanged event allows you to detect when the keyboard is extended.

You can subscribe to the KeyboardDeployedChanged event as shown:

DeviceStatus.KeyboardDeployedChanged += HandleKeyboardDeployedChanged;

The event handler can be used to determine whether the keyboard is deployed using the DeviceStatus class, as shown:

Click here to view code image

void HandleKeyboardDeployedChanged(object sender, EventArgs e)
{
    bool keyboardDeployed = DeviceStatus.IsKeyboardDeployed;
...
}

PowerSourceChanged Event

When the phone device is connected to a user’s computer, it may be a good time to perform some processor-intensive task that could potentially consume a lot of power, which would otherwise flatten the user’s battery. The PowerSourceChangedEvent allows you to detect when the user attaches or detaches an external power supply.

The PowerSourceChanged event can be subscribed to as shown:

DeviceStatus.PowerSourceChanged += HandlePowerSourceChanged;

The event handler can be used to retrieve the new PowerSource value from the DeviceStatus class, as shown:

Click here to view code image

void HandlePowerSourceChanged(object sender, EventArgs e)
{
    PowerSource powerSource = DeviceStatus.PowerSource;
...
}

Note

The DeviceState.PowerSourceChanged event is not raised on the app’s UI thread. All updates to visual elements must, therefore, be invoked on the UI thread, either directly by using the app’s global Dispatcher or indirectly via a custom property change notification system, discussed later in this chapter.

Note

Avoid using DeviceState.PowerSource for determining whether to use the phone’s network connection to transfer a substantial amount of data. See Chapter 27, “Communicating with Network Services,” to learn how to monitor network connectivity and how to determine the type of network connection being used.

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