From: j.m.maurer (j.m.maurer@student.utwente.nl)
Date: Mon Jul 29 2002 - 10:25:28 EDT
Op ma 29-07-2002, om 15:47 schreef Tomas Frydrych:
>
> The updateBackgroundColor mechanism seems to be very seriously
> flawed and needs to be rewritten, as it is one of the main bottlenecks
> in the code.
>
> The problem is this: the various calls to updateBackgroundColor()
> propagate down to the run level, where
> fp_Run::updateBackgroundColor() querries the PieceTable (!!!) for
> the background colour property. This is not the way it should be --
I know this is not the right way to do stuff, but at this moment, it's
the only way to do it. It is needed for text that is within a table
cell: when a run clears a region that needs to be cleared, it does so
using the background color of the page, or the currently set highlight
color. The problem is: it must use the current cell background color if
the text is in a cell that has a background color set!
My proposal is (and i've already discussed this a bit with Martin and
Dom), that the run (or whatever container) should NOT clear the region
itself, but the container it is in (it's parent container) should clear
the region. If that container does not know how clear the region, then
it's parent container should clear the region.
(I guess this sounds incomprehenisble(?)...)
Take for example a table cell that has an *image* set as a background
(which we currently cannot do). When a run in that cell wants to clear a
region, it uses the highlight color, the page color or the cell
background color as described above. Of course this is WRONG! The region
must be cleared with the image contents of that region! So, the run
should propagate it's request up to the cell, which knows it has an
image as a background. The cell would finally ask the image to repaint
the specific region the run requested...
Is this the way to go, or doesn't it make sense?
Marc
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