Implement Swipe event on WP8 - windows-phone-8

Question

I am creating a wp8 application for showing some html files in a browser and the structure is
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Name="PageNavigationMenu">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Button Height="70" Content="P" Grid.Column="0" VerticalContentAlignment="Center" Click="btnPrevious_Click" x:Name="btnPrevious" ></Button>
<Button Height="70" Content="N" Grid.Column="1" VerticalAlignment="Center" Click="btnNext_Click" x:Name="btnNext"></Button>
</Grid>
<Grid Grid.Row="1" Hold="Grid_Hold">
<phone:WebBrowser IsScriptEnabled="True" x:Name="mainBrowserControl">
</phone:WebBrowser>
</Grid>
</Grid>
Now i am using a previous button and next button to change the content in browser . I want to do it using the Swipe Left / Swipe Right on browser . Like if user Swipe left direction , borswer content should be loaded with previous page and Swipe right results to load next page.
So what are the events i have to listen to implement swipe feature

Answer 1

There are two possibilities (AFAIK):
You can use XNA TouchPanel (more information about it you can find here: Working with TouchInput, Detecting Gestures and this blog) for this:
public MainPage()
{
InitializeComponent();
TouchPanel.EnabledGestures = GestureType.Flick;
myWebbrowser.ManipulationCompleted += myWebbrowser_ManipulationCompleted;
}
private void myWebbrowser_ManipulationCompleted(object sender, System.Windows.Input.ManipulationCompletedEventArgs e)
{
if (TouchPanel.IsGestureAvailable)
{
GestureSample gesture = TouchPanel.ReadGesture();
switch (gesture.GestureType)
{
case GestureType.Flick:
if (e.FinalVelocities.LinearVelocity.X < 0)
LoadNextPage();
if (e.FinalVelocities.LinearVelocity.X > 0)
LoadPreviousPage();
break;
default:
break;
}
}
}
Or you can use Silverlight Toolkit as described in this answer or other here.
EDIT - small remark
Only watch out, because when you use XNA, you sometimes need to do (for example OnNavigatedTo):
FrameworkDispatcher.Update();
Otherwise your App will sometimes crash.
Hope this helps.
EDIT 2 - code example after comment
In case your ManipulationEvent is handeled first (for example by Pivot or Map), I tried to subscribe to Touch.FrameReported - as I've tested - it should work:
public MainPage()
{
InitializeComponent();
TouchPanel.EnabledGestures = GestureType.Flick;
Touch.FrameReported += Touch_FrameReported;
}
private void Touch_FrameReported(object sender, TouchFrameEventArgs e)
{
if (TouchPanel.IsGestureAvailable)
{
GestureSample gesture = TouchPanel.ReadGesture();
switch (gesture.GestureType)
{
case GestureType.Flick:
if (gesture.Delta.X > 0)
MessageBox.Show("Right");
if (gesture.Delta.X < 0)
MessageBox.Show("Left");
break;
default:
break;
}
}
}
NEXT EDIT (after next comments) - better implementation and example of disabling up, down gestures:
If you don't want to activate for up (little left)/down (little right), you have to describe conditions yourself. Be aware that there is a very little chance (if any) that user will move his finger only left/right/up/down - so you have to include some margin. There are many solutions for that, you have to try and play with it, the simpliest solutions just compare deltaX and deltaY of gesture:
public MainPage()
{
InitializeComponent();
TouchPanel.EnabledGestures = GestureType.Flick | GestureType.HorizontalDrag;
Touch.FrameReported += Touch_FrameReported;
}
TouchPoint firstPoint;
private void Touch_FrameReported(object sender, TouchFrameEventArgs e)
{
TouchPoint mainTouch = e.GetPrimaryTouchPoint(ContentPanel);
if (mainTouch.Action == TouchAction.Down) firstPoint = mainTouch;
else if (mainTouch.Action == TouchAction.Up && TouchPanel.IsGestureAvailable)
{
double deltaX = mainTouch.Position.X - firstPoint.Position.X;
double deltaY = mainTouch.Position.Y - firstPoint.Position.Y;
if (Math.Abs(deltaX) > 2 * Math.Abs(deltaY))
{
if (deltaX < 0) MessageBox.Show("Right.");
if (deltaX > 0) MessageBox.Show("Left.");
}
}
}