[PyKDE] QTable cell color - better way ?

[Dave S]

On Monday 04 September 2006 06:34, Jim Bublitz wrote:
> On Sunday 03 September 2006 01:41, Dave S wrote:
> > As a relative newbe to GUI & QT programming I am trying to get various
> > background colours for a QTable call. Extensive googling & headscratching
> > has come up with re-defining paint() for each color. This seems like a
> > lot of code & I wondered if there is a more elegant way ? A kind of
> > self.table1.setColor(row, col, color) would be nice - or is this the only
> > way :)
> >
> > Dave
>
> class SomeKindOFTableItem (QTableItem):
>     def __init__ (self, table, value):
> 	# use default colors unless explicitly set
>         self.bgColor = None
>         self.fgColor = None
>
> # not all of these are necessary - depends on which you want
>     def setColor (self, bgColor, fgColor):
> 	#  bgColor, fgColor are QColor constants - eg QColor (0xff, 0x11, 0x00),
> or # Qt.red
>         self.bgColor = bgColor
>         self.fgColor = fgColor
>
>     def setBGColor (self, bgColor):
>         self.bgColor = bgColor
>
>     def setFGColor (self, fgColor):
>         self.fgColor = fgColor
>
>     def paint (self, painter, colorgrp, rect, selected):
>          if self.fgColor:
>             colorgrp.setColor (QColorGroup.Text, self.fgColor)
>
>         if self.bgColor:
>             colorgrp.setColor (QColorGroup.Base, self.bgColor)
>
>         QTableItem.paint (self, painter, colorgrp, rect, selected)
>
> then, for example:
>
> self.table.item (row, col).setColor (Qt.red, Qt.blue)
>
Thats brilliant ! 

> (of course (row,col) must have a QTableItem set - if you don't know, you
> need to test for that).
>
No problem

> I prefer to do it in the table item, because then the table item can
> respond automatically to its value, for example a negative $ amount in red,
> positive in black, or a table item can hold some kind of object that knows
> its status and displays a corresponding color automatically. A table item
> knows its row and column too, so it can respond to those as well. (You can
> have paint() do the color setting automatically instead of providing
> explicit "set" methods too)

So you can put code inside the table item ? - I did not realize this was 
possible. Ah... do you mean subclassing ?

>
> In fact, I prefer to make table items fairly smart - they can know if
> they're dollar amounts, integers, strings, telephone numbers, postal codes
> and all sorts of things so they can format and validate themselves.  Then
> you can overload QTable to "know" what table item type belongs in a
> particular column, and have it create the right type automatically - not
> too much harder. .
>
> Jim

Thank you so much for taking the time to answer. As a QT newbe (& Python 
semi-newbe) it is very much appreciated :)

Dave