UWP：如何在鼠標（指針）下獲取GridView項號（任何單擊都不會選擇）？

Question

有沒有辦法找出女巫Item編號在GridView的指針下？ 我想在鼠標下顯示有關該項目的簡短信息，而不用單擊來選擇該項目。

Answer 1

您可以為ItemTemplate的根元素處理PointerEntered和PointerExited事件。

XAML：

<GridView>
    <x:Int32>1</x:Int32>
    <x:Int32>2</x:Int32>
    <x:Int32>3</x:Int32>
    <GridView.ItemContainerStyle>
        <Style TargetType="GridViewItem">
            <Setter Property="HorizontalContentAlignment" Value="Stretch" />
            <Setter Property="VerticalContentAlignment" Value="Stretch" />
        </Style>
    </GridView.ItemContainerStyle>
    <GridView.ItemTemplate>
        <DataTemplate>
            <Grid PointerEntered="TextBlock_PointerEntered"
                          PointerExited="TextBlock_PointerExited"
                          Background="Transparent">
                <TextBlock Text="{Binding}" VerticalAlignment="Center" HorizontalAlignment="Center"/>
            </Grid>
        </DataTemplate>
    </GridView.ItemTemplate>
</GridView>

<TextBlock x:Name="tb" />

碼：

private void TextBlock_PointerEntered(object sender, PointerRoutedEventArgs e)
{
    Panel root = sender as Panel;
    var dataObject = root.DataContext;
    tb.Text = dataObject.ToString(); //displays the currently pointed number in "tb"
}

private void TextBlock_PointerExited(object sender, PointerRoutedEventArgs e)
{
    tb.Text = string.Empty;
}