** Changed in: qtsystems-opensource-src (Ubuntu)
Importance: Undecided => High
** Changed in: qtsystems-opensource-src (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1646080
Title:
Mir-backed InputDeviceModel’s count property is not updated timely
Status in qtsystems-opensource-src package in Ubuntu:
In Progress
Bug description:
I’m trying to use InputDeviceModel from QML with the following
example:
import QtQuick 2.4
import QtSystemInfo 5.5
Item {
InputDeviceModel {
id: idm
filter: InputInfo.Mouse
onCountChanged: console.log("mice model count:", devices, count)
onAdded: console.log("added mouse:", inputDevice, count)
onRemoved: console.log("removed mouse:", deviceId, count)
}
readonly property bool hasMouse: idm.count > 0
onHasMouseChanged: console.log("has mouse:", hasMouse)
}
When I launch the example with qmlscene on my arale with no mouse
connected, I’m not seeing any output (expected).
Then I connect a bluetooth keyboard/mouse combo, and I’m seeing the following:
mice model count: 1 0
added mouse: QInputDevice(0x17f6298) 1
(note how 'hasMouse', which supposedly was initially false, hasn’t been
updated)
Then I disconnect the combo, and I’m seeing the following:
mice model count: 0 1
has mouse: true
removed mouse: 15 0
Then I connect it again, and I’m seeing the following:
mice model count: 1 0
has mouse: false
added mouse: QInputDevice(0x18ee508) 1
It appears the countChanged property is emitted before a device is
added to/removed from the model, and thus the row count hasn’t
actually been updated yet. So any property binding that relies on
'count' will have an incorrect value.
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