Bug 52311 - Labels not rendered (wrapped/truncated) when in ScrollView
Summary: Labels not rendered (wrapped/truncated) when in ScrollView
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.4
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Paul DiPietro [MSFT]
Depends on:
Reported: 2017-02-04 13:55 UTC by Philipp Sumi
Modified: 2017-09-06 05:39 UTC (History)
3 users (show)

Tags: scrollview label
Is this bug a regression?: ---
Last known good build:

Wrong behavior: Label spilling over it's parent border (115.02 KB, image/png)
2017-02-04 13:57 UTC, Philipp Sumi
Correct behavior: Label applying word wrap (137.91 KB, image/png)
2017-02-04 13:57 UTC, Philipp Sumi

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Description Philipp Sumi 2017-02-04 13:55:47 UTC
I have a weird issue with labels wrapped in container hierarchy (chat bubbles) that are rendered within a ScrollView. During intialization, I programmatically scroll down to the latest item, which then most often doesn't render the message label correctly - it spills just over the visible area (see screenshot).

As soon as a re-rendering is triggered (e.g. because the keyboard opens), the label is properly rendered (2nd screenshot).

Here's my item template:

<?xml version="1.0" encoding="UTF-8"?>

<ContentView xmlns="http://xamarin.com/schemas/2014/forms"

    <Grid ColumnSpacing="0"
          BackgroundColor="{StaticResource ListViewBackgroundColor}">
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />

        <iconize:IconLabel Text="fa-caret-left"
                           TextColor="{StaticResource ReceivedChatBubbleBackground}"
                           Grid.Column="0" />

        <controls:RoundedBorder x:Name="MessageBorder"
                                BackgroundColor="{StaticResource ReceivedChatBubbleBackground}">
            <StackLayout Padding="{StaticResource MediumPadding}" Spacing="0">

                <!-- show sender name only if specified -->
                <Label Text="{Binding SenderName}"
                       IsVisible="{Binding SenderName, Converter={StaticResource StringToBoolConverter}}"
                       FontSize="{StaticResource SmallHintFontSize}"
                       TextColor="{StaticResource PrimaryDark}" />
                <Label Text="{Binding Message}"
                       FontSize="{StaticResource IncreasedFontSize}"
                       Margin="0,2,0,6" />
                <Label Text="{Binding TimestampText}"
                       FontSize="{StaticResource SmallHintFontSize}"
                       HorizontalOptions="End" />
Comment 1 Philipp Sumi 2017-02-04 13:57:03 UTC
Created attachment 19722 [details]
Wrong behavior: Label spilling over it's parent border
Comment 2 Philipp Sumi 2017-02-04 13:57:42 UTC
Created attachment 19723 [details]
Correct behavior: Label applying word wrap
Comment 3 Philipp Sumi 2017-02-04 14:05:28 UTC
I found a fix for this: My bubbles were rendered as Grid rows. If I switch them over to be rendered within a StackLayout, the issue seems to be gone. I have a déja-vu that label rendering and grids have been discussed in the forums, so there may be a more generic description/repro.
Comment 4 Paul DiPietro [MSFT] 2017-03-17 16:19:31 UTC
Do you feel this particular issue should be closed, then, if you have a personal fix? Alternatively, if any bugs exist that seem similar to what you experienced, we can cross-reference them.
Comment 5 Paul DiPietro [MSFT] 2017-06-15 16:47:13 UTC
Closing this as part of bug upkeep due to no response, so we will reasonably assume this is no longer an issue for you.
Comment 6 Nishant Gaurav 2017-09-06 05:39:18 UTC
This is cool stuff, http://mxbpointcodes.com