CODEWITHSUNDEEP
c#xamarin.forms
Taqi Gates
Taqi Gates

Reputation: 87

finding and element in xamarin forms listview

I have xamarin.forms.listview control and I have some elements in it. This listview will be populated dynamically. Now on a particular condition, I need to hide one element inside the listview, how can I find it and hide it?

<ListView x:Name="lstBids" Margin="0" HasUnevenRows="True">
    <ListView.ItemTemplate >
        <DataTemplate>
            <ViewCell>
                <Frame Margin="0,0,0,5" Padding="0" BackgroundColor="White">
                    <StackLayout Orientation="Vertical">
                        <Label Style="{StaticResource Medium}" Margin="10" HorizontalOptions="StartAndExpand" x:Name="lblComments" Text="{Binding Comments}"></Label>
                                <Frame x:Name="frmHire" BackgroundColor="{StaticResource base}" Padding="10,5" CornerRadius="5" HasShadow="False">
                                    <Label Text="Hire" Style="{StaticResource MediumWhite}"></Label>
                                    <Frame.GestureRecognizers>
                                        <TapGestureRecognizer Tapped="Hire_Clicked"></TapGestureRecognizer>
                                    </Frame.GestureRecognizers>
                                </Frame>
                            <Label Style="{StaticResource SmallGray}" HorizontalOptions="EndAndExpand"  Margin="0,0,10,0"  x:Name="lblDate" Text="{Binding UpdatedDate, StringFormat='{0:MMMM dd, yyyy hh:mm tt}'}"></Label>
                    </StackLayout>
                </Frame>
            </ViewCell>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

frmHire is the frame I need to hide in all the listview items on a particular condition, how can I achieve it? please help me.

Upvotes: 2

Views: 1190

Answers (2)

Lucas Zhang
Lucas Zhang

Reputation: 18861

You don't need to set the name of frame and get it in code behind . As Roubachof said.You can use data-binding to binding the value of IsVisible.And change it in ViewModel .

in xaml

<Frame IsVisible="{Binding IsVisible}"  Padding="10,5" CornerRadius="5" HasShadow="False">
   //...

</Frame>

in your model

public class Model : INotifyPropertyChanged
{
  public string Comments { get; set; }

  public event PropertyChangedEventHandler PropertyChanged;



  protected virtual void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
  {
     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
  }

  private bool isvisible;
  public bool IsVisible
  {
    get
    {
       return isvisible;
    }
    set
    {
      if (isvisible != value)
      {
         isvisible = value;
         NotifyPropertyChanged();
      }
     }
 }

        //...other property
}

And you can set the value of it.For example ,if you want to set all frame isVisible as false

foreach(var model in MyItems)
{
  model.IsVisible = false;
}

MyItems is the ItemsSource of listview . Don't forget init the property when you init the ItemsSource .Otherwise the value of IsVisible is false in default.

Upvotes: 1

Roubachof
Roubachof

Reputation: 3401

Simply bind the IsVisible property on your frmHire to the condition on the item of the ItemsSource.

The parent view model hosting the ObservableCollection or List will just have to go through the items and set the condition accordingly.

Upvotes: 1

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