PullToRefresh.UWP

Generic Pull Down to Refresh implementation for UWP.

中文说明参见 http://www.cnblogs.com/ms-uap/p/4814507.html。

Installation

Preferred way to install this library is to use NuGet:

PM> Install-Package PullToRefresh.UWP

or

nuget install PullToRefresh.UWP

The NuGet link is https://www.nuget.org/packages/PullToRefresh.UWP

Or you may need to refer the library project in your VS solution, or copy all related compiled files.

Getting Started

After referring the package, you can add namespace reference in your XAML file:

<Page x:Class="PullToRefresh.UWP.Sample.Scenarios.ListViewInside"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:local="using:PullToRefresh.UWP.Sample.Scenarios"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      xmlns:pr="using:PullToRefresh.UWP"
      mc:Ignorable="d">

Then put any element as PullToRefreshBox's content and hook RefreshInvoked event:

<pr:PullToRefreshBox x:Name="pr" RefreshInvoked="PullToRefreshBox_RefreshInvoked">
    <ListView x:Name="lv" ItemTemplate="{StaticResource ColorfulRectangle}" />
</pr:PullToRefreshBox>

The handler type is TypedEventHandler<DependencyObject, object>. The first parameter sender refers to PullToRefreshBox.Content, and the second parameter is reserved as null.

Then you just get PullToRefresh function.

More usage

• Common properties: - double RefreshThreshold {get;set;}: Get/set the threshold to trigger a refresh. - DataTemplate TopIndicatorTemplate {get;set;}: Customize top indicator. The DataContext is a double value meaning the ratio of pulled distance to threshold. May be greater than 100%. The top indicator template decides max distance to pull down.

• And this package provide a simple PullRefreshProgressControl to enable customized indicator.

For users who are not Simp.Chinese speaker, PullRefreshProgressControl has two property to customize native language as indicator text, you can set them like this:

<pr:PullToRefreshBox x:Name="pr" RefreshInvoked="PullToRefreshBox_RefreshInvoked">
    <pr:PullToRefreshBox.TopIndicatorTemplate>
        <DataTemplate>
            <pr:PullRefreshProgressControl Progress="{Binding}"
                                           PullToRefreshText="Pull"
                                           ReleaseToRefreshText="Release" />
        </DataTemplate>
    </pr:PullToRefreshBox.TopIndicatorTemplate>

    <ListView x:Name="lv" ItemTemplate="{StaticResource ColorfulRectangle}" />
</pr:PullToRefreshBox>

Don't forget to bind Progress.

• PullRefreshProgressControl has two VisualStates: - Normal - ReleaseToRefresh

which makes richer customization possible:

<Grid>
    <pr:PullToRefreshBox RefreshInvoked="pr_RefreshInvoked">
        <pr:PullToRefreshBox.TopIndicatorTemplate>
            <DataTemplate>
                <Grid Background="LightBlue"
                      Height="130"
                      Width="200">
                    <pr:PullRefreshProgressControl Progress="{Binding}"
                                                   HorizontalAlignment="Center"
                                                   VerticalAlignment="Bottom">
                        <pr:PullRefreshProgressControl.Template>
                            <ControlTemplate>
                                <Grid>
                                    <VisualStateManager.VisualStateGroups>
                                        <VisualStateGroup x:Name="VisualStateGroup">
                                            <VisualState x:Name="Normal" />
                                            <VisualState x:Name="ReleaseToRefresh">
                                                <Storyboard>
                                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="txt" Storyboard.TargetProperty="Text">
                                                        <DiscreteObjectKeyFrame KeyTime="0" Value="释放刷新" />
                                                    </ObjectAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </VisualState>
                                        </VisualStateGroup>
                                    </VisualStateManager.VisualStateGroups>

                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="auto" />
                                        <RowDefinition Height="auto" />
                                    </Grid.RowDefinitions>

                                    <TextBlock x:Name="txt"
                                               Text="下拉刷新"
                                               Grid.Row="1"
                                               FontSize="20"
                                               HorizontalAlignment="Center" />
                                    <TextBlock Text="{Binding}"
                                               FontSize="24"
                                               Foreground="Gray"
                                               HorizontalAlignment="Center" />

                                </Grid>
                            </ControlTemplate>
                        </pr:PullRefreshProgressControl.Template>
                    </pr:PullRefreshProgressControl>

                </Grid>

            </DataTemplate>
        </pr:PullToRefreshBox.TopIndicatorTemplate>

        <ListView x:Name="ic">
            <ListView.ItemContainerStyle>
                <Style TargetType="ListViewItem">
                    <Setter Property="HorizontalAlignment" Value="Center" />
                </Style>
            </ListView.ItemContainerStyle>
            <ListView.ItemTemplate>
                <DataTemplate>
                    <Rectangle Width="100" Height="200">
                        <Rectangle.Fill>
                            <SolidColorBrush Color="{Binding}" />
                        </Rectangle.Fill>
                    </Rectangle>
                </DataTemplate>
            </ListView.ItemTemplate>

        </ListView>
    </pr:PullToRefreshBox>
</Grid>

• For more complex scenarios, try to use your own top template and bind to DataContext.

Have fun coding UWP :)