Analysis of the interaction between Chromium and Wayland-IVI-extension

Ucan, Emre (ADITG/SW1) eucan at
Tue Feb 21 11:06:30 EST 2017


It was basically a design decision to not set keyboard focus when a window is clicked.

Because in a standard IVI device, hard keys are always routed to HMI application.

It is very important that the HMI application does not lose keyboard focus.

We have to implement a IPC interface between chromium and HMI application so that HMI application can set the keyboard focus when chromium requests it.

Best regards

Emre Ucan
Software Group I (ADITG/SW1)

Tel. +49 5121 49 6937

> -----Original Message-----
> From: genivi-ivi-layer-management [mailto:genivi-ivi-layer-management-
> bounces at] On Behalf Of Jacobo Aragunde Pérez
> Sent: Dienstag, 21. Februar 2017 14:08
> To: Friedrich, Eugen (ADITG/SW1); eg-nw at; genivi-ivi-layer-
> management at
> Cc: genivi-projects at
> Subject: Re: Analysis of the interaction between Chromium and Wayland-IVI-
> extension
> Hi, Eugen!
> On 17/02/17 15:06, Friedrich, Eugen (ADITG/SW1) wrote:
> > ...
> >> * When I try with two Chromium surfaces (two browser windows), they
> >> don't follow the expected behavior. Only one of the surfaces receives
> >> input, even if you had assigned one seat to each surface.
> > [EF] Will Chromium open a new connection to wayland compositor  for
> every window?
> > If yes we should check if events are distributed to correct client.
> > If not we should check if we have correct working ilm surface, e.g. it should
> be possible to change the visibility of those with LayerManagerControl tool
> >
> Chromium shares the connection. I think the code assumes that only one
> window is focused at every time and that causes these conflicts when you
> leave Chromium to manage the focus of its own surfaces. I'll dig a bit
> deeper to find out.
> >>...
> >>> * Chromium can steal the keyboard focus from another Chromium
> >> window.
> >>> When there are two Chromium surfaces, if they keyboard focus belongs
> to
> >>> the first one and you click on the second, the second surface will
> >>> effectively take the keyboard focus away. LayerManager will not be
> aware
> >>> of the change, it will say the focus still belongs to the first surface.
> >>> This is probably an error that should be fixed.
> > [EF] this behavior is expected. There should be a trigger from Chromium to
> the HMI/Application controller
> > and HMI/Application controller has to decide if the focus should be
> changed.
> > Typically  in the IVI environment Hardkey focus is always assigned to same
> application but of cause not always.
> >
> I don't think this is expected behavior, because other applications
> behave differently: when you have two browser windows and click on the
> unfocused one, it takes the pointer and the keyboard focus; if you try
> to do the same with two weston-terminal windows, it will take the
> pointer focus but not the keyboard.
> What's worse, Chromium is probably not sending any notice to the
> controller because the LayerManagerControl command reports the wrong
> window has the keyboard focus. As I said, I'm in the process to digging
> a bit deeper to find out :)
> Best,
> --
> Jacobo Aragunde
> Software Engineer at Igalia
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