如何在Xamarin.Forms中的ListView上禁用突出显示 [英] How to disable highlight on ListView in Xamarin.Forms

问题描述

我正在使用Xamarin.Forms和XAML，并且正在尝试创建一个存储产品列表的应用程序.我将产品列表放在ListView中.这很好.这是我的XAML:

I'm working with Xamarin.Forms and XAML, and I'm trying to create an application that stores a list of products. I put my list of products in a ListView. This works fine. Here is my XAML:

<ListView x:Name="listSushi"
        ItemsSource="{x:Static local:myListSushi.All}"
        SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
        RowHeight="{StaticResource rowHeight}"
        >
<ListView.ItemTemplate>
  <DataTemplate>
    <ViewCell>
      <ViewCell.View>
        <StackLayout Padding="5, 5, 0, 5"
                     Orientation="Horizontal"
                     Spacing="15">
          <StackLayout>
            <Image Source="{Binding ImageSource}" />
          </StackLayout>

          <StackLayout Padding="0, 0, 0, 0"
                       VerticalOptions="Center"
                       HorizontalOptions="FillAndExpand">                
                <Label Text="{Binding Name}"
                   Font="Bold, Medium" />
                <Label Text="{Binding Description}" 
                    Font="Small"/>
          </StackLayout>

          <StackLayout Orientation="Horizontal"
                        Padding="0, 0, 10, 0">
            <Button Text=" - " 
                    HorizontalOptions="EndAndExpand"
                    VerticalOptions="FillAndExpand"
                    Command="{Binding DeleteSushiCommand}"
                    CommandParameter="{Binding Name}"
                    />
            <Label VerticalOptions="Center" 
                   Text="{Binding Number,StringFormat='{0}'}"
                   TextColor="Black"/>
            <Button Text=" + " 
                    HorizontalOptions="EndAndExpand"
                    VerticalOptions="FillAndExpand" 
                    Command="{Binding AddSushiCommand}"
                    CommandParameter="{Binding Name}"
                    />
            </StackLayout>
        </StackLayout>
      </ViewCell.View>
    </ViewCell>
  </DataTemplate>
</ListView.ItemTemplate>

我遇到的问题是，如果单击listView的某个单元格，则该单元格将突出显示，并保持突出显示状态.我尝试使用xaml.cs中的此代码禁用它

I've just the problem that if I click on a cell of my listView, the cell is highlight, and stay highlight. I've try to disable it with this code in the xaml.cs

listSushi.ItemSelected+= (object sender, SelectedItemChangedEventArgs e) => {
    // don't do anything if we just de-selected the row
    if (e.SelectedItem == null) return; 
    // do something with e.SelectedItem
    ((ListView)sender).SelectedItem = null; // de-select the row
};

但是当我触摸一个单元格时，我的列表现在会自动滚动.很奇怪.

But when I touch a cell, now my list is scrolling automatically. It's very strange.

有人知道这是一个bug还是一个修复程序，例如是否有可以禁用突出显示的属性?

Does anyone know if this is a bug, or know a fix, like if there is a property where I can disable the highlight?

推荐答案

您可以尝试使用ItemTapped事件，即

You might try using the ItemTapped event instead, i.e.

listSushi.ItemTapped += (object sender, ItemTappedEventArgs e) => {
    // don't do anything if we just de-selected the row.
    if (e.Item == null) return;

    // Optionally pause a bit to allow the preselect hint.
    Task.Delay(500);

    // Deselect the item.
    if (sender is ListView lv) lv.SelectedItem = null;

    // Do something with the selection.
    ...
};

我已经在ListView(在Android设备上)上对此进行了测试，该列表具有足够的项目以将滚动带入混合.我没有看到自动滚动的行为，并且您想将SelectedItem设置为null来击败突出显示的想法很棒.

I have tested this on a ListView (on an Android device) that has enough items to bring scrolling into the mix. I see no auto-scroll behavior, and your idea to set SelectedItem null to defeat the highlight works great.

这篇关于如何在Xamarin.Forms中的ListView上禁用突出显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！