On December 5, 2009 09:21:38 Anders Lund wrote: > Hi, > > Sorry for crossposting, I hope it is not too bad. > > Now my problem: I have several plasma applets that uses qtimer to schedule > updates. These updates are then screwed up because of system suspends (I > close the lid of my laptop). So I can see two possible solutions: > > 1) a signal that informs about a resume from suspend/standby (I tried to > use the powersave plasma dataengine which have state variables, but they > are not updated during suspend/resume events) > > 2) using brute force by checking the system time in intervals (such as > every minute). In a plasma event this would mean connecting to the time > dataengine and compare my scheduled time with the current. > > I ask because I do not have the knowledge to decide what is the best thing > to do, or if 1) is possible at all - afaik it is not, since I havent found > any working solution for it (I know there is something called KIdleTime in > KDE 4.4, but I do not see how that could help in this case). >
#2 is Bad and Wrong; imagine every widget doing that, it'd be ridiculous. :) #1 is the right direction, although the exact implementation may differ... ideally dataengines should get kicked when there's a time jump or suspend or whatever; all the code to handle this should be in libplasma or higher (solid?), and it should Just Work for any dataengine. :) and of course a signal should be available for non-plasma stuff. now, I get the feeling that since it doesn't Just Work yet, Solid doesn't provide us with any such signal. this feels like the sort of thing that solid *should* provide, but I don't know enough about the low-level details to say how it should be implemented. I imagine that the best case would be hal (or whatever backend solid talks to) telling us that we've woken up from suspend; if it doesn't do that, then at least when *we* initiate the suspend we could make a note of it and find a way to signal when we wake up. but I don't know how that stuff actually works, so hopefully someone else can explain how and where you can implement it. :) the end result should be that developers can either listen for that signal from solid, or just use a dataengine. :) -- This message brought to you by eevil bananas and the number 3. www.chani3.com
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