Bug 3806 - ListView in VirtualMode produced events differently than MS .NET
Summary: ListView in VirtualMode produced events differently than MS .NET
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: Windows.Forms ()
Version: 2.10.x
Hardware: PC Linux
: Lowest normal
Target Milestone: Community
Assignee: Bugzilla
Depends on:
Reported: 2012-03-07 21:56 UTC by Seth Randall
Modified: 2017-09-01 11:56 UTC (History)
1 user (show)

Tags: mono-community
Is this bug a regression?: ---
Last known good build:

Test app (18.57 KB, application/zip)
2012-03-07 21:57 UTC, Seth Randall
Mono output (486 bytes, text/plain)
2012-03-07 21:57 UTC, Seth Randall
MS .NET output (400 bytes, text/plain)
2012-03-07 21:58 UTC, Seth Randall

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Description Seth Randall 2012-03-07 21:56:30 UTC
When a ListView has VirtualMode set to true, the events produced by selecting one or more items are different in Mono than Microsoft's .NET.

When selecting a single item, Mono produces a VirtualItemsSelectionRangeChanged event with SelectedIndices.Count set to 1. MS .NET produces one with the Count set to 0.

When selecting 3 items, MS.NET produces a VirtualItemsSelectRangeChanged event with a 0 count, a SelectedIndexChanged with a 0 count and then a VirtualItemsSelectionRangeChanged event with a count of 3.

Mono doesn't produce the first Virtual event, does produce the SelectedIndexChanged event for a 0 count and then produces SelectedIndexChanged events for each successive count up to 3 and then the VirtualItemsSelectionRangeChanged event for the count of 3.

I've attached a zip file with a test project to demonstrate the issue as well as two text files to show what it does on Mono and Visual Studio.
Comment 1 Seth Randall 2012-03-07 21:57:30 UTC
Created attachment 1480 [details]
Test app
Comment 2 Seth Randall 2012-03-07 21:57:50 UTC
Created attachment 1481 [details]
Mono output
Comment 3 Seth Randall 2012-03-07 21:58:20 UTC
Created attachment 1482 [details]
MS .NET output