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[Mac] Cache cell width to improve size calculations #813
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By caching the widths required to render each CompositeCell, the amount of required size calculations is reduced drastically. This also reduces the amount of drawing cycles and improves the overall speed and responsivness of lists/trees a lot.
Therzok
reviewed
Mar 20, 2018
| NSTableColumn tcol = base.AddColumn (col); | ||
| var widths = new List<nfloat> (); | ||
| if (Table.RowCount > 0) | ||
| widths.InsertRange (0, Enumerable.Repeat<nfloat> (-1f, (int)Table.RowCount)); |
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This will do Insert N times instead of doing a block insert. Avoid direct IEnumerables here. Please pass something ICollection derived. (the IEnumerable<T> overload handles checking for ICollection<T>)
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Actually, I think pre-allocating list capacity (new List<nfloat> (table.RowCount) then doing
for (int i = 0; i < Table.RowCount; ++i) widths.Add (-1f) is better
Therzok
reviewed
Mar 20, 2018
| public virtual void SetSource (IListDataSource source, IBackend sourceBackend) | ||
| { | ||
| this.source = source; | ||
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| RowHeights = new List<nfloat> (); | ||
| for (int i = 0; i < source.RowCount; i++) | ||
| RowHeights.Add (-1); | ||
| foreach (var colWidths in ColumnRowWidths) { | ||
| colWidths.Clear (); | ||
| colWidths.AddRange (Enumerable.Repeat<nfloat> (-1, source.RowCount)); |
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Same as above, AddRange on IEnumerable<T> but not ICollection<T> does not do block copy.
Therzok
approved these changes
Mar 22, 2018
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By caching the widths required to render each CompositeCell, the amount of required size calculations is reduced drastically. This also reduces the amount of drawing cycles and improves the overall speed and responsivness of lists/trees a lot.
Limitation: this adds caching only, but full cell resize is still not supported. A call to
QueueResizewill remeasure the cell and update the height required to render the cell with its current width. For a full resize we'll need to hook the column autosizing into the resizing process.