Im trying to open a App-Bar when the user reaches the end of the (ScrollViewer)Page... Therefore I need a indicator when the end is reached...
I cant find any event within this Viewer which could help me...
<ScrollViewer x:Name="SV_ScrollViewer"
Grid.Row="1"
Margin="12,0,12,0"
ManipulationMode="Control"
AllowDrop="False">
<Grid x:Name="ContentPanel">
<StackPanel>
<Controls:Map
Height="730"
x:Name="M_MainMap"
ZoomLevel="10"
Loaded="Map_Loaded"/>
<phone:LongListSelector
x:Name="LLS_FuelStations"
Height="700">
</phone:LongListSelector>
</StackPanel>
</Grid>
</ScrollViewer>
Thank you for your help!
2-EDIT: The LayoutUpdated-Event was not good for closing app-bar again... I ended up with a Dispatcher-Timer for closing AND opening it. Now it works fine (smooth):
// Constructor
public MainPage()
{
InitializeComponent();
Dispatcher.BeginInvoke(() =>
{
//initialize timer
if (timer == null)
{
int timerSpan = 500;
timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(timerSpan) };
timer.Tick += (o, arg) => OffsetWatcher();
}
});
}
Closing and opening app-bar:
private void OffsetWatcher()
{
if (SV_ScrollViewer.ScrollableHeight - SV_ScrollViewer.VerticalOffset > 100 )
{
if (ApplicationBar.IsVisible)
{
ApplicationBar.IsVisible = false;
ApplicationBar.IsMenuEnabled = false;
}
}
else
{
if (!ApplicationBar.IsVisible)
{
BuildLocalizedApplicationBar();
}
}
}
Use Layout Updated Here's code I used and debugged to get the scrolling effect. You might also need to keep a track where the pointer has been pressed and the scroll viewer manipulation completed event. Here's the xaml Add the respective event handler in the code behind.
<ScrollViewer ManipulationCompleted="ScrollViewer_ManipulationCompleted" ManipulationMode="All">
<StackPanel LayoutUpdated="StackPanel_LayoutUpdated" PointerPressed="StackPanel_PointerPressed">
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
<Grid Height="100" Width="100" Background="Red" ></Grid>
<Grid Height="100" Width="100" Background="Green" ></Grid>
<Grid Height="100" Width="100" Background="Blue" ></Grid>
<Grid Height="100" Width="100" Background="Yellow" ></Grid>
</StackPanel>
</ScrollViewer>
Here's the code behind
public MainPage()
{
this.InitializeComponent();
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property is typically used to configure the page.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
}
private void ScrollViewer_ManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
//scroll bar being dragged
}
private void StackPanel_LayoutUpdated(object sender, object e)
{
//if swipe gesture then check for vertical offset and carry on with the //calculations you have to do else do nothing
}
private void StackPanel_PointerPressed(object sender, PointerRoutedEventArgs e)
{
//swipe gesture being made
}
Please let me know if it worked