如何防止多次单击选项卡以专注于 AutoSuggestBoxView？

Question

我有一个表单，其中有许多标签和文本字段。因此，我通过单击键盘上的选项卡按钮在文本字段或条目中导航。正常条目集中在单击上，而作为自定义条目的 AutoSuggestBoxView 需要在选项卡上单击两次才能获得焦点。我不知道为什么我会面临这个问题。我已将 tabindex 应用为 0 和 -1 但仍然无法正常工作。这是我的 xaml 代码

<CtrlUC:UCCurrentLocation Grid.Row="0" HeightRequest="32" Grid.Column="0" Latitude="{Binding FieldsData.fromlatitude.Value,Mode=TwoWay}" Longitude="{Binding FieldsData.fromlongitude.Value,Mode=TwoWay}" Grid.RowSpan="2" Grid.ColumnSpan="2" HorizontalOptions="Fill" VerticalOptions="Fill" WidthRequest="400" Title="Location" LatitudeTitle="Latitude" LongitudeTitle="Longitude" ButtonText="Location" IsEditable="False" IsVisible="{Binding Path=FieldsData.FromLocationControl.IsVisible, Mode=TwoWay}" IsEnabled="{Binding Path=FieldsData.IsViolationCreated.IsEnabled, Mode=TwoWay}" />
                  <local:AutoSuggestBoxView x:Name="FromState" Grid.Row="1" Grid.Column="2" TabIndex="-1" Grid.RowSpan="1" Grid.ColumnSpan="1" DisplayMemberPath="{Binding FieldsData.PickerFromState.Value.DisplayField}" SelectedValuePath="{Binding FieldsData.PickerFromState.Value.ValueField}" SearchMemberPath="{Binding FieldsData.PickerFromState.Value.DisplayField}" VerticalOptions="StartAndExpand" ItemsSource="{Binding Path=FieldsData.PickerFromState.Value.DataSource}" SelectedItem="{Binding Path=FieldsData.PickerFromStateSelectedItem.Value, Mode=TwoWay}" SelectedValue="{Binding Path=FieldsData.fromstatePropertyText.Value, Mode=TwoWay}" Text="{Binding Path=FieldsData.fromstatename.Value, Mode=TwoWay}" Placeholder="Enter State" IsEnabled="{Binding Path=FieldsData.IsViolationCreated.IsEnabled, Mode=TwoWay}" IsVisible="{Binding Path=FieldsData.PickerFromState.IsVisible, Mode=TwoWay}" />
                  <local:CCEntry Grid.Row="1" Grid.Column="3" Style="{StaticResource FormEntryStyle}" Margin="0,0,10,3" Text="{Binding Path=FieldsData.fromstatecode.Value, Mode=TwoWay}" Grid.RowSpan="1" Grid.ColumnSpan="1" HorizontalOptions="Fill" VerticalOptions="Fill" IsEnabled="{Binding Path=FieldsData.fromstatecode.IsEnabled, Mode=TwoWay}" IsVisible="{Binding Path=FieldsData.LblFromStateCodeValue.IsVisible, Mode=TwoWay}" />
                  <local:AutoSuggestBoxView x:Name="FromCity" Grid.Row="1" Grid.Column="4" TabIndex="" Grid.RowSpan="1" Grid.ColumnSpan="1" DisplayMemberPath="{Binding FieldsData.PickerFromCity.Value.DisplayField}" SelectedValuePath="{Binding FieldsData.PickerFromCity.Value.ValueField}" SearchMemberPath="{Binding FieldsData.PickerFromCity.Value.DisplayField}" VerticalOptions="StartAndExpand" ItemsSource="{Binding Path=FieldsData.PickerFromCity.Value.DataSource}" SelectedItem="{Binding Path=FieldsData.PickerFromCitySelectedItem.Value, Mode=TwoWay}" SelectedValue="{Binding Path=FieldsData.fromcityPropertyText.Value, Mode=TwoWay}" Text="{Binding Path=FieldsData.fromcityname.Value, Mode=TwoWay}" Placeholder="Enter City" IsEnabled="{Binding Path=FieldsData.IsViolationCreated.IsEnabled, Mode=TwoWay}" IsVisible="{Binding Path=FieldsData.PickerFromCity.IsVisible, Mode=TwoWay}" />
                  <local:CCEntry Grid.Row="1" Grid.Column="5" Style="{StaticResource FormEntryStyle}" Margin="0,0,10,3" Text="{Binding Path=FieldsData.fromcitycode.Value, Mode=TwoWay}" Grid.RowSpan="1" Grid.ColumnSpan="1" HorizontalOptions="Fill" VerticalOptions="Fill" IsEnabled="{Binding Path=FieldsData.fromstatecode.IsEnabled, Mode=TwoWay}" IsVisible="{Binding Path=FieldsData.LblFromCityCodeValue.IsVisible, Mode=TwoWay}" />
                  <local:AutoSuggestBoxView x:Name="FromCounty" Grid.Row="1" Grid.Column="6" TabIndex="0" Grid.RowSpan="1" Grid.ColumnSpan="1" DisplayMemberPath="{Binding FieldsData.PickerFromcounty.Value.DisplayField}" SelectedValuePath="{Binding FieldsData.PickerFromcounty.Value.ValueField}" SearchMemberPath="{Binding FieldsData.PickerFromcounty.Value.DisplayField}" VerticalOptions="StartAndExpand" ItemsSource="{Binding Path=FieldsData.PickerFromcounty.Value.DataSource}" SelectedItem="{Binding Path=FieldsData.PickerFromCountySelectedItem.Value, Mode=TwoWay}" SelectedValue="{Binding Path=FieldsData.fromcountyPropertyText.Value, Mode=TwoWay}" Text="{Binding Path=FieldsData.fromcountyname.Value, Mode=TwoWay}" Placeholder="Enter County" IsEnabled="{Binding Path=FieldsData.IsViolationCreated.IsEnabled, Mode=TwoWay}" IsVisible="{Binding Path=FieldsData.PickerFromcounty.IsVisible, Mode=TwoWay}" />
                  <local:CCEntry Grid.Row="1" Grid.Column="7" Style="{StaticResource FormEntryStyle}" Margin="0,0,10,3" Text="{Binding Path=FieldsData.fromcountycode.Value, Mode=TwoWay}" Grid.RowSpan="1" Grid.ColumnSpan="1" HorizontalOptions="Fill" VerticalOptions="Fill" IsEnabled="{Binding Path=FieldsData.fromstatecode.IsEnabled, Mode=TwoWay}" IsVisible="{Binding Path=FieldsData.LblFromCountyCodeValue.IsVisible, Mode=TwoWay}" />

因此，您可以在代码中看到像 CCEntry 这样的正常条目只需单击一次选项卡即可。但是自定义条目 AutoSuggestBoxView 需要在选项卡上单击两次才能获得焦点。我不知道如何解决这个问题。有什么建议吗？

Answer 1

只有一种方法可以避免在 xamarin.forms 中多次点击，您必须使用如下所示的布尔标志

public class MyPage : ContentPage
{
    public isClicked = false;

    public MyPage()
    {   
        InitializeComponent();
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();
        isClicked = false;
    }

    private void ItemTapped(object sender, System.EventArgs e)
    {
        if(isClicked)
            return;

        isClicked = true;
        //Do your work here
    }
}

我正在使用这种方式来避免多次点击。