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A list view for showing active tasks and their progress, and for cancelling them\n\nA new dock widget has been added with a task manager widget showing global tasks.\n\nYou can test with the following code:\n\n```\nfrom time import sleep\nclass TestTask( QgsTask ):\n\n    def __init__(self, desc, time ):\n        QgsTask.__init__(self, desc )\n        self.time= time\n\n    def run(self):\n        wait_time = self.time / 100.0\n        for i in range(101):\n            sleep(wait_time)\n            self.setProgress(i)\n            if self.isCancelled():\n                self.stopped()\n                return \n        self.completed()\n\nfor time in range(10, 14):\n    task = TestTask('wait {}'.format( time ), time ) \n    QgsTaskManager.instance().addTask( task )\n\n```\n\nNote that I get crashes with this. My suspicion is that it's due to some oddness in SIP, but it's quite possible there's bugs in the code too!\n\n@wonder-sk Would appreciate you taking a look at this version!\n","created_at":"2016-04-15T13:49:48Z","updated_at":"2016-12-05T07:23:11Z","closed_at":"2016-12-05T07:23:11Z","merged_at":null,"merge_commit_sha":"c811ae97739f8803c4b50f7a9012ad5bd57679f4","assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/qgis/QGIS/milestones/9","html_url":"https://github.com/qgis/QGIS/milestones/QGIS%203","labels_url":"https://api.github.com/repos/qgis/QGIS/milestones/9/labels","id":1468273,"number":9,"title":"QGIS 3","description":"Code which requires an API change or contains other modifications which is not acceptable without a major version number 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