Change the GdkEventTouch struct to contain a GdkTouchSequence
pointer instead of an integer and adapt all places in gdk
that were dealing with touch ids.
The changes to the type masks in this patch are meant to
make it so that touch events only go to windows that explicitly
select for them. It may not be correct.
This commit introduces GDK_TOUCH_BEGIN/UPDATE/END/CANCEL
and a separate GdkEventTouch struct that they use. This
is closer to the touch event API of other platforms and
matches the xi2 events closely, too.
If an active grab kicks in on a different window, _gdk_display_has_device_grab()
would still find the former implicit grab for the window below the pointer, thus
sending events to an unrelated place.
If a grab with GDK_TOUCH_MASK kicks in due to a touch sequence emulating pointer
events, don't mutate the sequence into emitting touch events right away.
Create the backing GdkTouchGrabInfo for touches even if the pointer
emulating touch sequence is already holding an implicit grab on a
window that didn't select for touch events.
the backing GdkTouchGrabInfo will be needed if the overriding device
grab finishes before the touch does in order to send events back to
the implicit grab window. Instead, wait until the touch is physically
finished before removing the matching GdkTouchGrabInfo
GDK will only receive touch events when dealing with a multitouch
device, so these must be transformed to pointer events if the
client-side window receiving the event doesn't listen to touch
events, and the touch sequence the event is from does emulate
the pointer.
If a sequence emulates pointer events, it will result in a
button-press, N motions with GDK_BUTTON1_MASK set and a
button-release event, and it will deliver crossing events
as specified by the current device grab.
These are equivalent to an implicit grab (with !owner_events), so
if the touch leaves or enters the grab window, the other window
won't receive the corresponding counter-event.
Touch events don't generate crossing events themselves, so
do not rely on these to determine whether the button release
happened within the event window.
Likewise to pointer events, have touch events during a device
grab with owner_events=TRUE be delivered normally as long as
the widget pertains to the same window group.
In GtkWidget, touch events go through the same handler
than motion events, with the difference that touch_id
will have something meaningful there.
Touch events need to be explicitly selected, so if this
is enabled, the possibility of different motion streams
with different touch IDs must be handled in some way.
If the touch sequence happens on a window with GDK_TOUCH_MASK set,
a GdkTouchGrabInfo is created to back it up. Else a device grab is
only created if the sequence emulates the pointer.
If both a device and a touch grab are present on a window, the later
of them both is obeyed, Any grab on the device happening after a
touch grab generates grab broken on all the windows an implicit
touch grab was going on, and all touches would be automatically
removed from every touch cluster.
If given an event coming from a touch devices,
this functions will read the MT major/minor/orientation
axes and return a cairo_region_t with the touch shape.
GdkDeviceManagerXI2 now handles touch events.
TouchMotion events are translated to GDK_TOUCH_MOTION events,
TouchBegin/End events are translated to the newly introduced
GDK_TOUCH_PRESS/RELEASE events.
This widget is too narrow to make touch interaction tricky enough, so
don't add the penalty of having the slider run farther from the touch
coordinates if it happens to miss the slider.
This is so submenus stay open as the parent menu item is
pressed/released, since the user would typically lift the
finger in order to select a submenu item.
