Xamarin.Forms untappable的ListView（删除选择连锁反应） [英] Xamarin.Forms untappable ListView (remove selection ripple effect)

问题描述

我有一个自定义的ViewCell显示文章一个ListView。然而，当你选择一个项目，它显示了材料设计涟漪/选择效应。

I have a ListView with a custom ViewCell that displays articles. However when you select a item, it shows the material design ripple/selection effect.

的XAML：

   <ListView HasUnevenRows="True" ItemsSource="{Binding NewsArticles}" IsPullToRefreshEnabled="True">
        <ListView.ItemTemplate>
          <DataTemplate>
            <ViewCell>
              <StackLayout Padding="10">
                <Label Text="{Binding Title}" HorizontalOptions="Center" FontAttributes="Bold" />
                <Image Source="{Binding ImageUrl}" IsVisible="{Binding HasImage}" />
                <Label Text="{Binding Content}"></Label>
              </StackLayout>
            </ViewCell>
          </DataTemplate>
        </ListView.ItemTemplate>
      </ListView>

我如何删除的连锁反应？

How do I remove the ripple effect?

更新：

在做一些研究，我发现的在XLabs库RepeaterView 。如果你把它包装在滚动型，虽然它带走了很多的ListView整齐力学的，如清爽的这个作品。它也不支持从外螺纹到的ItemSource变化。还在寻找其他的解决办法，因为我知道这是有可能在原生的Android。

After doing some research I found the RepeaterView in the XLabs library. This works if you wrap it in a ScrollView although it takes away a lot of the neat ListView mechanics such as refreshing. It also doesn't support changes to the ItemSource from an external thread. Still looking for other solutions since I know this is possible in native Android.

推荐答案

所以经过很长一段时间我们想通了，你可以用自定义渲染完成它。这里是怎么了，

So after a long, long time we figured it out, you can accomplish it with a custom renderer. Here is how,

首先，创建一个名为 no_selector.xml 文件并将其放置在资源/文件夹布局（包装性能必须。设为AndroidResource）

First, create a file called no_selector.xml and place it in the Resources/layouts folder (the packaging properties must be set to AndroidResource).

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_window_focused="false" android:drawable="@android:color/transparent"/>
</selector>

之后，创建为ListView组件定制呈现，

After that create a custom renderer for the ListView component,

[assembly: ExportRenderer (typeof(ListView), typeof(NoRippleListViewRenderer))]
namespace Your.Own.Namespace
{
    public class NoRippleListViewRenderer : ListViewRenderer
    {
        protected override void OnElementChanged (ElementChangedEventArgs<ListView> e)
        {
            base.OnElementChanged (e);
            Control.SetSelector (Resource.Layout.no_selector);
        }
    }
}

的如果 no_selector 文件无法找到重建项目！的

If the no_selector file can't be found rebuild your project!

要注意的是，这将删除纹波为全部的在应用程序列表视图。如果你只希望它的目标一对夫妇，你可以更改ExportRenderer属性第一类（这确实需要你做一个扩展的ListView一个单独的类）。

Be aware of the fact that this removes the ripple for all the ListViews in your application. If you only want it to target a couple you can change the first type on the ExportRenderer attribute (this does require you to make a separate class that extends ListView).

一个样品可以在这里找到 。

A sample can be found here.

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