[mythtv] mythvideo+mythui: get statetype "watchedstate" working for DLG_TREE

[Markus Schulz]

hello

i'm trying to allow the statetype "watchedstate" (and all other 
statetypes like userratingstate, ...) to work inside the DLG_TREE. 

Currently something like:
                <statetype name="watchedstate">
                    <state name="no">
                        <textarea name="uhuh">
                            <area>974,56,50,30</area>
                            <align>allcenter</align>
                            <font>basesmallgreen</font>
                            <alpha>210</alpha>
                            <value>New</value>
                        </textarea>
                    </state>
                    <state name="yes" />
                </statetype>

in your video-ui buttonlist don't work if the user use the DLG_TREE.

For type != DLG_TREE it works because in VideoDialog::loadData() the 
m_videoButtonList was initialized with new MythUIButtonListItem() items 
and each item was passed thru UpdateItem() where the handleState() stuff 
was done.

for the DLG_TREE we need a different solution. 
at best by iterate thru all ButtonLists/Items from the ButtonTree and 
call UpdateItem() for each ButtonListItem.
But with current API this is not possible.(please correct me if i am 
wrong)

Another solution (my current choice) connects the 
SIGNAL(itemVisible(MythUIButtonListItem *))
from the VideoButtonTree with a new function and do the handlestate() 
stuff inside this one.(patch attached to this mail)
But this solution has the drawback, that the signal itemVisible occurs 
rather often (one signal for each item currently visible on each move) 
and i need it only once after building the tree.

i have attached my current version and would like to hear some comments.

regards 
msc
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