Hi all,
Great job.
I use Ubuntu with FF2. I used virtualization - guest OS "Windows XP" -
to test qooxdoo applications (huge tables) because FF2 runs faster in
Windows XP. From yesterday I don't need anymore to launch guest OS to
test qooxdoo.
asaris
Fabian Jakobs wrote:
Hi,
in the last few days we have been working hard to improve the scroll
performance of the table. Today finally the changes have been merged
back with the old table in trunk (development branch for 0.8). This is
what we have done:
Sebastian did some performance tests with virtual tables using plain
HTML. His tests indicated that full updates using innerHTML should be
significantly faster then updates using DOM manipulations. Doing some
tricks with the update strategy while scrolling did also improve the
user experience. What I did, was to apply his results to the table
widget.
The changes are:
1. Use an updated version of the "array_join" renderer, which renderes
a HTML table.
2. Cache the computed html strings of each rendered table row. This
makes rendering somewhat independent from the cell renderer and removes
the need for caches there.
3. Use a special render path for scrolling. If the user scrolls up to
10 lines, the hidden lines are removed from the DOM and only the new
lines are added. For a small number of scrolled rows (<10) this is
way faster than a full update.
4. If only focus or selection state changes use the "old" strategy to
only update the row styles.
5. Use a new strategy for scroll updates. A timer now periodically
checks whether an update is needed. This limits the number of updates
and improves the responsiveness.
Most work has been done in the table pane and the table scroller. The
table API itself has not changed except of the cell and row renderer.
The exact changes are documented here:
<http://qooxdoo.org/about/release_notes/0.7.2#table>. These
changes should only touch people who have written their own cell or row
renderers. In general the changes are only minor. Updating TreeVirtual
took only a couple of minutes ;-)
I nobody has serious objections, I will port back the changes to
legacy_0_7 tomorrow so they will show up in qooxdoo 0.7.2.
As a goody I have attached a small application (rename to
tabletest.zip) running both tables side by side.
Best Fabian
<file:///Users/fabianpb/Desktop/mailtable/tabletest.zi_.zip>
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