Le 14/10/2015 09:01, Henrik Johansen a écrit : > If you by some chance don't like UILoops, and so don't want to make a > spinning UILoop inside your UILoop, you could also use a single background > thread, something like; > > FilteredDataSource (to be used as dataSource for FastTable, polymorphic api > to normal dataSource but redirecting to filteredDataSource variable) > class protocol > filter: aFilter source: aDataSource > ^self new initializeFilter: aFilter source: aDataSource > inst protocol, update related > initializeFilter: aFilterField source: aDataSource > > initialDataSource := filteredDataSource := aDataSource > filterChangeSemaphore := Semaphore new. > self spawnFilterUpdateThread > aFilterField when: ValueChanged send: #updateFilter: to self > > updateFilter: aChangeAnnouncement > "(Probably) runs on UI thread" > pattern := aChangeAnnouncement newValue. > filterChangeSemaphore signal. > > spawnFilterUpdateThread > "Runs in background" > [ | oldPattern | > oldPattern := pattern. > [ filterChangeSemaphore wait. > "If pattern has changed, see if we need to filter. > If not, it's probably an extraneous signal received while we were > waiting for 0.2 seconds, and we discard then till we end up waiting for > filterChangeSemaphore again" > oldPattern ~= pattern > ifTrue: [ > oldPattern := pattern. > 0.2 seconds wait. > "Pattern still the same? If not, just loop again and > end up waiting for another 0.2 secs" > oldPattern = pattern > ifTrue: [ > filteredDataSource := initialDataSource > newDataSourceMatching: pattern. > self announce: > WhateverChangeAnnouncementBasedOnWhichFastTableSchedulesAViewUpdateForItsDatasource > ]]] repeat ] > forkAt: Processor userBackgroundPriority > > Cheers, > Henry >
Thank you really much! I tried to get a working version of the widget with the UILoop but that was terrible. But the semaphore work fine. I still need to learn a lot of things about fork, semaphore & co. Thank you for your precious help :) -- Cyril Ferlicot http://www.synectique.eu 165 Avenue Bretagne Lille 59000 France
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