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

[From: Aniello Del Sorbo]

Thanks to everyone for clarifying this.
It'll greatly help !

Aniello

2009/8/24 Cornelius Hald <hald at icandy.de>:
> Kimmo, thanks for the clarification! I´ll update the wiki article
> accordingly!
>
> Thanks!
> Conny
>
>
> 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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anidel
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