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List:       koffice-devel
Subject:    Re: [kspread] formatting design
From:       John Dailey <dailey () vt ! edu>
Date:       2002-12-15 2:53:15
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> Ok, if you selected all possible cell and change their borders, thousands
> of cell objects would be created. That's the reason, why we don't have
> something like a "Select All" menu entry.
In this case, no, there would be a BorderLayout object for the sheet set with 
the new border, and you simply have to remove any existing BorderLayout 
references in existing cells.  No new cells are created.

>
> You can even use a sheet layout for it, because all the individual
> attributes should stay, just the border attribute changes.
Which is why we break apart into different types of Format objects -- like a 
BorderFormat, FontFormat, BackgroundFormat, etc.  What I named a 'style' is a 
complete set of format objects that encompass all configurable layout/format 
options.  If a cell's style is missing certain format objects, then it uses 
the default from the column or row's style, and if missing there, uses the 
sheet style, and if missing there, uses the document style which has all the 
'default' settings.  This would be how 'fallbacks' work.

>
> Or what if a user uses "Select All" to select really every cell and
> deselects the first column? This wouldn't be possible with a sheet layout
> either.

This is the tricky case.  I am hesitant to agree that we should set up these 
lists of regions with certain styles.  I think if we start setting up regions 
these lists can grow and grow and become very inefficient.  I suggest we keep 
track of the selection so that if all cells are selected then changing the 
format changes the sheet's format and any columns or rows that were 
deselected before changing the format are then set manually to what they had 
before.  
An example would probably clarify this:

To begin with, the document has default formats, each sheet, column, row, and 
cell has the empty style which means inherit the default.
Select all cells in the sheet and set background color blue.  
   ---- Now the sheet style has the BackgroundFormat object that is blue.
Select all cells and then deselect column A, and then set background color 
green. 
  ---- The code 'realizes' that the selection is all cells minus column A so 
column A is manually set to it's current background value.  This means we 
retrieve column A's background layout (doesn't have one so it retrieves the 
default from the sheet which is blue), and then set's column A's style to 
contain that blue BackgroundFormat.  Finally, the sheet's backgroundformat is 
set to green.


Does that make sense?  Difficult to explain but I think it is more efficient 
than managing ever-growing lists of regions with associated styles.


-John
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