[maemo-developers] Howto enable portrait mode support on Fremantle

[From: Cornelius Hald]

Hello again :)

Listening to the DBus messages and setting the SUPPORT/REQUEST flags
works and the outcome is as described.

Now the only problem left is the orientation detection during startup.
When doing the call to MCE_DEVICE_ORIENTATION_GET I'm always getting the
following error message:

"The name com.nokia.mce was not provided by any .service files"

Does anyone know what I'm doing wrong? The code is as follows:

DBusError error;
DBusMessage *message, *reply;

message = dbus_message_new_method_call(MCE_SERVICE,
                                   MCE_REQUEST_PATH,
                                   MCE_REQUEST_IF,
                                   MCE_DEVICE_ORIENTATION_GET);

dbus_error_init(&error);
reply = dbus_connection_send_with_reply_and_block(connection, message,
                                                      -1, &error);


I hope someone can help, oh and by the way I'm a DBus noob, so it might
be that I'm missing something obvious.

Thanks!
Conny



On Mon, 2009-08-24 at 10:24 +0300, Kimmo Hämäläinen wrote:
> On Fri, 2009-08-21 at 15:53 +0200, ext Alberto Garcia wrote:
> > On Fri, Aug 21, 2009 at 02:53:01PM +0200, Cornelius Hald wrote:
> > 
> > I'll try to summarize how it works (I'm adding Kimmo to Cc in case I'm
> > forgetting something, as the rotating itself is done by the desktop,
> > libhildon only sets a WM hint).
> > 
> > Let's suppose we open a new window. Before we open that window the
> > device might already be in portrait mode.
> > 
> > If the portrait flags of the new window are:
> > 
> > 1) No flags -> The screen is rotated to landscape mode.
> 
> Correct.  An example: when you are in portrait mode and suddenly a
> system-modal dialog pops up without the SUPPORT or REQUEST flag, we go
> to the landscape mode.
> 
> > 2) _SUPPORT -> The screen keeps its orientation.
> 
> Correct ...unless some window has the REQUEST flag. The SUPPORT flag on
> your window tells that you support the portrait mode, i.e. your window
> can relayout itself for the portrait mode. The REQUEST flag on your
> window tells that you want to be in the portrait mode (for whatever
> reason, not necessarily just because the device is currently in portrait
> orientation!).  Hildon-desktop is not turning the screen to portrait
> unless there is at least one visible window with REQUEST and the rest of
> the visible windows have the SUPPORT (explicit or implicit) flag. These
> flags are inherited to transient windows, and REQUEST implies the
> SUPPORT flag.
> 
> > 3) _SUPPORT + _REQUEST -> The screen is rotated to portrait mode
> > 4) _REQUEST alone -> I don't think we're using that. Kimmo?
> 
> REQUEST is the same as REQUEST + SUPPORT. Since there is no sense to
> request the portrait mode if you don't support it...
> 
> > To detect whether a device is physically rotated I think you need to
> > use the DBus API already mentioned in this thread.
> 
> Correct, the sig_device_orientation_ind signal from MCE.
> 
> > In other words: using this API alone won't change the orientation of
> > the screen when the device is physically rotated, am I right Kimmo?
> 
> Hildon-desktop looks at these flags, it does not listen to the
> orientation signals, so it does not know how the device is oriented
> relative to the Earth's crust.  (There is an exception to this, but you
> are not affected by it.)
> 
> -Kimmo
> 
> > 
> > Berto
> 
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