当用户取消选择时继续突出显示单元格
Keep highlighting the cell when user deselect
我正在使用 Xamarin Forms ListView
作为边栏。如何防止用户取消选择单元格?或者至少在用户取消选择时继续突出显示该单元格。
这就是我绑定的方式
<ListView x:Name="listView" SelectionMode="Single">
<ListView.ItemsSource>
<x:Array Type="{x:Type x:String}">
<x:String>Management</x:String>
<x:String>Information</x:String>
<x:String>Language</x:String>
<x:String>Settings</x:String>
</x:Array>
</ListView.ItemsSource>
<ListView.ItemTemplate>
<DataTemplate>
<TextCell Text="{Binding}" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
根据您的需要,我做了类似的事情,但每行内都有控件,例如复选框。
https://xamarinhelp.com/multiselect-listview-xamarin-forms/
使用ListView的SelectedItem
属性。只要 SelectedItem
属性 没有设置回 null,当前选中的项目将保持突出显示。
根据您的描述,当您从 ListView 中 select item 时,此 item 突出显示,您希望此 item 在未处于 selected 状态时仍然突出显示。您似乎想要 select ListView 中的多个项目。
我做了一个样例,你可以看看:
<ContentPage.Content>
<StackLayout>
<ListView
ItemTapped="ListView_ItemTapped"
ItemsSource="{Binding Items}"
SelectionMode="Single">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout BackgroundColor="{Binding background}" Orientation="Horizontal">
<Label
HorizontalOptions="StartAndExpand"
Text="{Binding DisplayName}"
TextColor="Fuchsia" />
<BoxView
HorizontalOptions="End"
IsVisible="{Binding Selected}"
Color="Fuchsia" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ContentPage.Content>
public partial class Page10 : ContentPage
{
public Page10 ()
{
InitializeComponent ();
this.BindingContext = new MultiSelectItemsViewModel();
}
private void ListView_ItemTapped(object sender, ItemTappedEventArgs e)
{
Model m = e.Item as Model;
if(m!=null)
{
m.Selected = !m.Selected;
if(m.background==Color.White)
{
m.background = Color.BlueViolet;
}
else
{
m.background = Color.White;
}
}
}
}
public class Model:ViewModelBase
{
public string DisplayName { get; set; }
private bool _Selected;
public bool Selected
{
get { return _Selected; }
set
{
_Selected = value;
RaisePropertyChanged("Selected");
}
}
private Color _background;
public Color background
{
get { return _background; }
set
{
_background = value;
RaisePropertyChanged("background");
}
}
}
public class MultiSelectItemsViewModel
{
public ObservableCollection<Model> Items { get; set; }
public MultiSelectItemsViewModel()
{
Items = new ObservableCollection<Model>();
Items.Add(new Model() { DisplayName = "AAA", Selected = false,background=Color.White });
Items.Add(new Model() { DisplayName = "BBB", Selected = false , background = Color.White });
Items.Add(new Model() { DisplayName = "CCC", Selected = false, background = Color.White });
Items.Add(new Model() { DisplayName = "DDD", Selected = false, background = Color.White });
Items.Add(new Model() { DisplayName = "EEE", Selected = false, background = Color.White });
}
}
如果我的回复对您有帮助,请记得将我的回复标记为已答复,谢谢
更新:
不允许用户取消select selected 项目。
private void ListView_ItemTapped(object sender, ItemTappedEventArgs e)
{
Model m = e.Item as Model;
if(m!=null)
{
m.Selected = true;
m.background = Color.Blue;
}
}
我正在使用 Xamarin Forms ListView
作为边栏。如何防止用户取消选择单元格?或者至少在用户取消选择时继续突出显示该单元格。
这就是我绑定的方式
<ListView x:Name="listView" SelectionMode="Single">
<ListView.ItemsSource>
<x:Array Type="{x:Type x:String}">
<x:String>Management</x:String>
<x:String>Information</x:String>
<x:String>Language</x:String>
<x:String>Settings</x:String>
</x:Array>
</ListView.ItemsSource>
<ListView.ItemTemplate>
<DataTemplate>
<TextCell Text="{Binding}" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
根据您的需要,我做了类似的事情,但每行内都有控件,例如复选框。
https://xamarinhelp.com/multiselect-listview-xamarin-forms/
使用ListView的SelectedItem
属性。只要 SelectedItem
属性 没有设置回 null,当前选中的项目将保持突出显示。
根据您的描述,当您从 ListView 中 select item 时,此 item 突出显示,您希望此 item 在未处于 selected 状态时仍然突出显示。您似乎想要 select ListView 中的多个项目。
我做了一个样例,你可以看看:
<ContentPage.Content>
<StackLayout>
<ListView
ItemTapped="ListView_ItemTapped"
ItemsSource="{Binding Items}"
SelectionMode="Single">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout BackgroundColor="{Binding background}" Orientation="Horizontal">
<Label
HorizontalOptions="StartAndExpand"
Text="{Binding DisplayName}"
TextColor="Fuchsia" />
<BoxView
HorizontalOptions="End"
IsVisible="{Binding Selected}"
Color="Fuchsia" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ContentPage.Content>
public partial class Page10 : ContentPage
{
public Page10 ()
{
InitializeComponent ();
this.BindingContext = new MultiSelectItemsViewModel();
}
private void ListView_ItemTapped(object sender, ItemTappedEventArgs e)
{
Model m = e.Item as Model;
if(m!=null)
{
m.Selected = !m.Selected;
if(m.background==Color.White)
{
m.background = Color.BlueViolet;
}
else
{
m.background = Color.White;
}
}
}
}
public class Model:ViewModelBase
{
public string DisplayName { get; set; }
private bool _Selected;
public bool Selected
{
get { return _Selected; }
set
{
_Selected = value;
RaisePropertyChanged("Selected");
}
}
private Color _background;
public Color background
{
get { return _background; }
set
{
_background = value;
RaisePropertyChanged("background");
}
}
}
public class MultiSelectItemsViewModel
{
public ObservableCollection<Model> Items { get; set; }
public MultiSelectItemsViewModel()
{
Items = new ObservableCollection<Model>();
Items.Add(new Model() { DisplayName = "AAA", Selected = false,background=Color.White });
Items.Add(new Model() { DisplayName = "BBB", Selected = false , background = Color.White });
Items.Add(new Model() { DisplayName = "CCC", Selected = false, background = Color.White });
Items.Add(new Model() { DisplayName = "DDD", Selected = false, background = Color.White });
Items.Add(new Model() { DisplayName = "EEE", Selected = false, background = Color.White });
}
}
如果我的回复对您有帮助,请记得将我的回复标记为已答复,谢谢
更新:
不允许用户取消select selected 项目。
private void ListView_ItemTapped(object sender, ItemTappedEventArgs e)
{
Model m = e.Item as Model;
if(m!=null)
{
m.Selected = true;
m.background = Color.Blue;
}
}