LongListMultiSelector在WP8上未获取父项的宽度

Question

There is WP8 app. I have LongListMultiSelector (without any options) that's inside PanoramItem. But actual width of LongListMultiSelector is more than parent PanoramaItem (on my device: 432 vs 444). I tried to set HorizontalAlignemt option to "Stretch" but it didn't help me. What's problem?

Answer 1

That's really the problem of using list controls in WP. Try setting the Width explicitly, or in the DataTemplate 's panel (say you use Grid as your template root panel)

<LongListMultiSelector.ItemTemplate>
    <DataTemplate>
        <Grid Width="440">
        </Grid>
    </DataTemplate>
</LongListMultiSelector.ItemTemplate>

Answer 2

It's happening because of ScrollViewer of LongListSelector. And because of ScrollViewer phone calculates wrong width of items inside control. I found only one solution — set another margin option of SV and content area in LongListSelector Style. But it's not ideal because in this case ScrollViewer is outside the width you need.