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evdevtouch: also use BTN_TOUCH with value == 0 to detect TouchPointReleased

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The current code seems to rely on an event, ABS_MT_TOUCH_MAJOR with a
value of 0 to detect a touch release.  Not all devices[0] emit this, and
the spec[1] does not specify this behavior.

So, add a check for a BTN_TOUCH with a value of 0 to also indicate
Qt::TouchPointReleased.

[0]
http://www.chalk-elec.com/?page_id=1280#!/~/product/category=3094861&id=14647624
using hid_ntrig kernel module.

[1] https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt

Change-Id: I4fc8ff404cad2083a57ff18737c5ea2b06d8ceac
Reviewed-by: Robert Daniels <robert.daniels@vantagecontrols.com>
Reviewed-by: Laszlo Agocs <lagocs83@gmail.com>
This commit is contained in:
Jon Trulson 2012-11-02 15:47:19 -06:00 committed by The Qt Project
parent 21c07f56e2
commit 43c4d909c5
1 changed files with 5 additions and 0 deletions
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5
src/platformsupport/input/evdevtouch/qevdevtouch.cpp
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@ -350,6 +350,11 @@ void QEvdevTouchScreenData::processInputEvent(input_event *data)
m_currentSlot = data->value;
}
} else if (data->type == EV_KEY && !m_typeB) {
if (data->code == BTN_TOUCH && data->value == 0)
{
m_contacts[m_currentSlot].state = Qt::TouchPointReleased;
}
} else if (data->type == EV_SYN && data->code == SYN_MT_REPORT && m_lastEventType != EV_SYN) {
// If there is no tracking id, one will be generated later.