I am new in windows phone development. i want to try to implement pull down to refresh page. i use listbox under scrollviewer i am having a problem while implement in windows phone 8.1 silverlight application. here is my code
MainPage.xaml
<phone:PhoneApplicationPage
x:Class="PullDownToScroll.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid>
<ScrollViewer Name="OuterScroll" Loaded="OuterScroll_Loaded" LayoutUpdated="OuterScroll_ViewChanged">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="60"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid Background="GreenYellow">
<Image Source="Assets/down13.png" Height="40" Width="40" HorizontalAlignment="Left" Margin="20,0,0,0">
<Image.RenderTransform>
<RotateTransform x:Name="RefreshIndicatiorRotateTransform" CenterX="20" CenterY="20"/>
</Image.RenderTransform>
</Image>
<TextBlock Name="RefreshIndicatiorTextBlock" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="80,0,0,0" Width="200" Foreground="Black"/>
</Grid>
<ListBox Name="InnerListView" Grid.Row="1">
</ListBox>
</Grid>
</ScrollViewer>
</Grid>
</Grid>
</phone:PhoneApplicationPage>
MainPage.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using PullDownToScroll.Resources;
using System.Windows.Media;
namespace PullDownToScroll
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
this.InitializeComponent();
InnerListView.Height = ApplicationView.GetForCurrentView().VisibleBounds.Height;
GenerateRandomListViewItem();
this.NavigationCacheMode = NavigationCacheMode.Required;
// Sample code to localize the ApplicationBar
//BuildLocalizedApplicationBar();
}
public void GenerateRandomListViewItem()
{
InnerListView.Items.Clear();
Random rand = new Random();
for (int i = 0; i < 20; i++)
{
ListBox item = new ListBox();
item.Background = new SolidColorBrush(Color.FromArgb(255, (byte)rand.Next(0, 255), (byte)rand.Next(0, 255), (byte)rand.Next(0, 255)));
item.Height = rand.NextDouble() * 150;
item.Margin = new Thickness(0, 8, 0, 8);
InnerListView.Items.Add(item);
}
}
private void OuterScroll_Loaded(object sender, RoutedEventArgs e)
{
OuterScroll.ChangeView(null, 60, null, false);
}
private void OuterScroll_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
if (!e.IsIntermediate)
{
if (OuterScroll.VerticalOffset < 60)
{
if (OuterScroll.VerticalOffset <= 0.5)
OuterScroll.ChangeView(null, 60, null, false);
else
OuterScroll.ChangeView(null, 60, null);
}
if (OuterScroll.VerticalOffset <= 0.5)
{
GenerateRandomListViewItem();
}
}
else
{
double angle = (65 - OuterScroll.VerticalOffset) * 180 / 65;
RefreshIndicatiorRotateTransform.Angle = angle;
}
if (OuterScroll.VerticalOffset == 0)
RefreshIndicatiorTextBlock.Text = "Release to refresh";
else
RefreshIndicatiorTextBlock.Text = "Pull to refresh";
}
}
}
In MainPage.xaml.cs i found an error Error 1 The type or namespace name 'ScrollViewerViewChangedEventArgs' could not be found (are you missing a using directive or an assembly reference?) how should i resolve this problem ?? please share you suggestion. Thanks in advance.
Best way to refresh view/screen use Application bar. Put refresh icon in Application bar and on icon click refresh your view/screen.
This link is help full for how to use Appication bar
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