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Show the same Palette as we show when a learner does
a right click on a canvas element.
We use the LongPress event controller from the toolkit for
that. We can only hook this up to the browser widget once
it is realized because we need to enable the touch events
on the x11 window.
When we recognized a long-press event we need to get the
information about that canvas element from WebKit. The
webkit_web_view_get_hit_test_result API [1] which we use
when a right click is recognized does expect an event of
type GdkEventButton to be passed. From the x, y coordinates
we get with the pressed signal we can construct such an
event and and pass that fake event to WebKit.
In order to differentiate between a tap and a tap&hold
event, we need to inhibit the release event to be further
propagated if a long-press occurred before. We use a
boolean to differentiate those two cases.
[1] http://webkitgtk.org/reference/webkitgtk/stable/webkitgtk-webkitwebview.html#webkit-web-view-get-hit-test-result
Signed-off-by: Simon Schampijer <simon@laptop.org>
Acked-by: Manuel Quiñones <manuq@laptop.org>
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