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QmlProfiler: Document restrictions of SortedTimelineModel

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SortedTimelineModel only works with perfectly nested ranges. Specify
what that means so that we don't stumble over it for the (n+1)th time.

Change-Id: I77f276ba9152fb023d875d0f326e7d646945d3a7
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
This commit is contained in:
Ulf Hermann
2014-07-07 11:56:39 +02:00
parent 4aa4e64b77
commit 730997b2d8
1 changed files with 8 additions and 2 deletions
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10
src/plugins/qmlprofiler/sortedtimelinemodel.cpp
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@@ -31,8 +31,14 @@
\class QmlProfiler::SortedTimelineModel
\brief Sorted model for timeline data
The SortedTimelineModel lets you keep any kind of range data sorted by
both start and end times, so that visible ranges can easily be computed.
The SortedTimelineModel lets you keep range data sorted by both start and end times, so that
visible ranges can easily be computed. The only precondition for that to work is that the ranges
must be perfectly nested. A "parent" range of a range R is defined as a range for which the
start time is smaller than R's start time and the end time is greater than R's end time. A set
of ranges is perfectly nested if all parent ranges of any given range have a common parent
range. Mind that you can always make that happen by defining a range that spans the whole
available time span. That, however, will make any code that uses firstStartTime() and
lastEndTime() for selecting subsets of the model always select all of it.
*/
/*!