Windows 10 UWP开发:如何去掉ListView默认的选中效果

开发UWP的时候,很多人会碰到一个问题,就是ListView在被数据绑定之后经常有个默认选中的效果,就像这样:

而且它不仅会选中,还会触发一次SelectionChanged事件,当然,我们要让ListView可点击,一种流行的做法确实是用SelectionChanged事件,就像这样:

private void StationsList_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
    var station = StationsList.SelectedItem as Station;
    if (null != station)
    {
        SelectedStationChanged?.Invoke(this, station);
    }

    StationsList.SelectedItem = null;
}

但是因为数据绑定之后会被默认选中一项,所以这个事件被直接触发了,用户就会直接进入Item的子页面,ListView会一闪而过,为此我还写过workround:

private void StationSearchResultListControl_OnSelectedStationChanged(object sender, Station station)
{
    if (selectedAllStationListCount > 0)
    {
        if (null != station)
        {
            Frame.Navigate(typeof(StationDetail), station);
        }
    }

    selectedAllStationListCount++;
}

// Work around, listview seems got default selected value.
private int selectedAllStationListCount;

结果今天发现其实ListView的默认选中效果是可以去掉的,只要把SelectionMode设置为None:

SelectionMode="None"

现在就不会有默认选中项了:

然后把点击的事件从SelectionChanged换成ItemClick,而且一定记得要把IsItemClickEnabled打开:

<ListView x:Name="StationsList" 
          ItemsSource="{Binding Source={StaticResource GroupedStations}}"
          Margin="-10,0,0,0" 
          SelectionMode="None"
          HorizontalContentAlignment="Stretch" 
          ItemClick="StationsList_OnItemClick"
          IsItemClickEnabled="True">

这样后台代码就可以用e.ClickedItem直接获得当前被点击的对象:

private void StationsList_OnItemClick(object sender, ItemClickEventArgs e)
{
    var station = e.ClickedItem as Station;
    if (null != station)
    {
        SelectedStationChanged?.Invoke(this, station);
    }

    StationsList.SelectedItem = null;
}

并且那个恶心的workround也能去掉了,代码更加有逼格了!

posted @ 2016-10-15 11:55  天涯海角路  阅读(815)  评论(0编辑  收藏  举报