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Bug
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Resolution: Fixed
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P2: Important
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None
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5.11.2
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None
Verified: Applies to QtMultimedia 5.11, 5.15
The below set of logs contain 3 separate examples of QtDeclarativePlaylist::removeItem() behavior. The first example sees currentIndex set to -1 and currentIndexChanged emitted, triggering the currentIndex log. The second sets currentIndex to -1 but does not emit currentIndexChanged. The last sets currentIndex to 0 and does not emit currentIndexChanged. These all happen when calling removeItem() on an index below currentIndex. Frustratingly, the line of separation between these behaviors seems to be the value of currentIndex. If currentIndex >= 5, the first behavior occurs. It is unclear which of the latter two behaviors will occur when currentIndex < 5 (though more testing may show an exact pattern).
2000-01-01_01:24:19.54152 qml: QtDeclarativePlaylist::removeItem() (before) currentIndex = 5 2000-01-01_01:24:19.54187 qml: currentIndex == -1 2000-01-01_01:24:19.62280 qml: QtDeclarativePlaylist::removeItem() (after) currentIndex = -1 ... 2000-01-01_01:24:20.53792 qml: QtDeclarativePlaylist::removeItem() (before) currentIndex = 4 2000-01-01_01:24:20.56190 qml: QtDeclarativePlaylist::removeItem() (after) currentIndex = -1 ... 2000-01-01_01:24:21.34511 qml: QtDeclarativePlaylist::removeItem() (before) currentIndex = 3 2000-01-01_01:24:21.38927 qml: QtDeclarativePlaylist::removeItem() (after) currentIndex = 0
And here is pseudocode that demonstrates the issue.
QDeclarativePlaylist playlist; playlist.addItem("/media/zero.mp4"); playlist.addItem("/media/one.mp4"); playlist.addItem("/media/two.mp4"); playlist.addItem("/media/three.mp4"); playlist.addItem("/media/four.mp4"); playlist.addItem("/media/five.mp4"); playlist.setCurrentIndex(5); cout << "QtDeclarativePlaylist::removeItem() (before)", "currentIndex = " << playlist.currentIndex << std::endl; playlist.removeItem(4); cout << "QtDeclarativePlaylist::removeItem() (after)", "currentIndex = " << playlist.currentIndex << std::endl; playlist.setCurrentIndex(4); cout << "QtDeclarativePlaylist::removeItem() (before)", "currentIndex = " << playlist.currentIndex << std::endl; playlist.removeItem(3); cout << "QtDeclarativePlaylist::removeItem() (after)", "currentIndex = " << playlist.currentIndex << std::endl; playlist.setCurrentIndex(3); cout << "QtDeclarativePlaylist::removeItem() (before)", "currentIndex = " << playlist.currentIndex << std::endl; playlist.removeItem(2); cout << "QtDeclarativePlaylist::removeItem() (after)", "currentIndex = " << playlist.currentIndex << std::endl;