I’ve now updated my branch to use the public SwipeArea component from
the UITK, and I’m still seeing an issue similar to the one originally
reported. I can reproduce it with a minimal standalone example:
import QtQuick 2.4
import Ubuntu.Components 1.3
import com.canonical.Oxide 1.11
WebView {
url: "https://en.wikipedia.org/wiki/Ubuntu_(operating_system)"
SwipeArea {
direction: SwipeArea.Upwards
onDraggingChanged: console.log("dragging:", dragging)
onDistanceChanged: console.log("distance:", distance)
anchors {
left: parent.left
right: parent.right
bottom: parent.bottom
}
height: units.gu(2)
}
}
I instrumented oxide to print a log statement every time a touch event
is detected, and when starting a drag even from the bottom edge, the
following happens:
qml: distance: 0
virtual void OxideQQuickWebView::touchEvent(QTouchEvent*)
QTouchEvent(TouchBegin states: QFlags(0x1), 1 points: (TouchPoint(0
QRectF(599.979,1848.5 2.9974x2.9974) pressed)))
virtual void OxideQQuickWebView::touchEvent(QTouchEvent*)
QTouchEvent(TouchUpdate states: QFlags(0x2), 1 points: (TouchPoint(0
QRectF(613.967,1676.09 2.9974x1.99827) moved)))
virtual void OxideQQuickWebView::touchEvent(QTouchEvent*)
QTouchEvent(TouchUpdate states: QFlags(0x2), 1 points: (TouchPoint(0
QRectF(618.213,1623.12 4.99566x2.9974) moved)))
virtual void OxideQQuickWebView::touchEvent(QTouchEvent*)
QTouchEvent(TouchUpdate states: QFlags(0x2), 1 points: (TouchPoint(0
QRectF(620.961,1507.47 2.9974x1.99827) moved)))
virtual void OxideQQuickWebView::touchEvent(QTouchEvent*)
QTouchEvent(TouchUpdate states: QFlags(0x2), 1 points: (TouchPoint(0
QRectF(620.961,1492.02 2.9974x1.99827) moved)))
qml: dragging: true
qml: distance: 148.6371093749999
[…]
qml: distance: 513.631586442578
qml: dragging: false
It appears the webview is getting a TouchBegin event, followed by a
number of TouchUpdate events, before the SwipeArea even detects a drag.
When it does, events stop being sent to the webview, which as a
consequence never gets a TouchEnd event to match the first TouchBegin
event, leaving it in an inconsistent state.
** Summary changed:
- SwipeArea lets touch events through when a drag is detected
+ SwipeArea lets touch events through before a drag is detected
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https://bugs.launchpad.net/bugs/1459362
Title:
SwipeArea lets touch events through before a drag is detected
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