Saturday, May 30, 2009

Changing the Orientation or Surface application

Surface supports orientation of applications to 2 sides according to the seating position of the user.If we are developing applications we have to rotate our applications our self.Its done by checking the static property Microsoft.Surface.ApplicationLauncher.Orientation.
There is an event called Microsoft.Surface.ApplicationLauncher.OrientationChanged which fires when the user changes his side by clicking on the access buttons at the corresponding side.

Setting the Orientation
We need to have a RotateTransform in our application whose Angle ,we are going to change according to the Orientation.Normally we place the RotateTransform in the root element of the SurfaceWindow.

<s:SurfaceWindow x:Class="SurfaceApplication1.SurfaceWindow1"
<Grid Name="MenuGrid">
<RotateTransform x:Name="OrientationTransform" Angle="0"/>
<TextBlock Name="OrientationTextBox" HorizontalAlignment="Center"/>

Subscribe to the ApplicationLauncher.OrientationChanged event and set the Angle as per the ApplicationLauncher.Orientation property.

private void AddActivationHandlers()
// Subscribe to surface application activation events
ApplicationLauncher.ApplicationActivated += OnApplicationActivated;
ApplicationLauncher.ApplicationPreviewed += OnApplicationPreviewed;
ApplicationLauncher.ApplicationDeactivated += OnApplicationDeactivated;
ApplicationLauncher.OrientationChanged += ApplicationLauncher_OrientationChanged;
void ApplicationLauncher_OrientationChanged(object sender, OrientationChangedEventArgs e)
OrientationTransform.Angle = ApplicationLauncher.Orientation == UserOrientation.Top ? 180 : 0;
OrientationTextBox.Text = ApplicationLauncher.Orientation.ToString();

Using Triggers to change the Orientation or Surface application based on ApplicationLauncher.Orientation.

Its clear like water that we can’t use EventTrigger to set the Angle of Transform.Another method is PropertyTrigger.Since the ApplicationLauncher.Orientation is not an AttachedProperty we can’t use that method too.Simply saying we have to write code in order to achieve.I am searching for a method which does the same using xaml alone.If anybody finds,please share with me.

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