删除的ListView项目按钮 [英] Delete button on ListView items
问题描述
我开始开发UWP。我试图创建一个的ListView
填充 X:绑定
。现在我想对所有单个项目的删除它们创建一个按钮。类似的Windows 10邮件:
I'm starting to develop for UWP. I'm trying to create a ListView
populated with x:bind
. Now I want to create a button on all single items for delete them. Something like Windows 10 Mail:
我已经创建了:
<ListView x:Name="listActivity" ItemsSource="{x:Bind list}" Grid.Column="0" Header="Activity List" HorizontalAlignment="Center" Width="auto" IsItemClickEnabled="True" ItemClick="showDel">
<ListView.ItemTemplate>
<DataTemplate x:DataType="vm:Activity">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*"/>
<ColumnDefinition Width="1*"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="txt" Text="{x:Bind name}" Grid.Column="0"/>
<Button x:Name="delItem" Click="delActivity" Grid.Column="1" Visibility="Collapsed" Background="Transparent" Margin="100, 0, 0, 0">
<SymbolIcon Symbol="Delete"/>
</Button>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
我要改变 delItem
按钮的能见度
,但是从C#我不能用集合称之为名称。我该怎么做?
I want to change the visibility
of delItem
button, but from C# I can't call it with set Name. How I can do that?
推荐答案
我建议用结合执行此操作。
I recommend to perform this operation by using binding.
a)新属性添加到名为可见类活动
a) Add a new property to your class Activity named Visible
public class Activity : INotifyPropertyChanged
{
public string Name { get; set; }
private bool _visible;
public bool Visible {
get { return _visible; }
set
{
_visible = value;
RaisePropertyChanged("Visible");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged(string name)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
}
B)也声明一个新的类转换布尔能见度
b) Declare also a new class to convert boolean to visibility
public class BooleanToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, string language)
{
return (value is bool && (bool)value) ? Visibility.Visible : Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter, string language)
{
return value is Visibility && (Visibility)value == Visibility.Visible;
}
}
C)和最后更新绑定。不要忘了单向模式设置。
c) And finally update your binding. Don't forget the OneWay mode setting.
<Page.Resources>
<local:BooleanToVisibilityConverter x:Key="VisibilityConverter"/>
</Page.Resources>
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<ListView ItemsSource="{x:Bind Activities}">
<ListView.ItemTemplate>
<DataTemplate x:DataType="local:Activity">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*"/>
<ColumnDefinition Width="1*"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="txt" Text="{x:Bind Name}" Grid.Column="0"/>
<Button x:Name="delItem" Click="delItem_Click" Grid.Column="1" Visibility="{x:Bind Visible, Mode=OneWay, Converter={StaticResource VisibilityConverter}}" Background="Transparent" Margin="100, 0, 0, 0">
<SymbolIcon Symbol="Delete"/>
</Button>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
您现在可以通过code直接访问的可视性或控制。全code如下,以供参考。
You can now access the Visibility or your control directly by code. Full code below for reference.
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
namespace App1
{
public sealed partial class MainPage : Page
{
public List<Activity> Activities { get; set; }
public MainPage()
{
this.InitializeComponent();
Activities = new List<Activity>();
Activities.Add(new Activity { Name = "Activity1", Visible = true });
Activities.Add(new Activity { Name = "Activity2", Visible = false });
}
private void delItem_Click(object sender, RoutedEventArgs e)
{
Activities.First().Visible = false;
}
}
public class BooleanToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, string language)
{
return (value is bool && (bool)value) ? Visibility.Visible : Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter, string language)
{
return value is Visibility && (Visibility)value == Visibility.Visible;
}
}
public class Activity : INotifyPropertyChanged
{
public string Name { get; set; }
private bool _visible;
public bool Visible {
get { return _visible; }
set
{
_visible = value;
RaisePropertyChanged("Visible");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged(string name)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
}
}
这篇关于删除的ListView项目按钮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!