Signed-off-by: Jens Bocklage <jens_bocklage@mentor.com>
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Right now an application has to pull this information.\r
This is not optimal and will change in the future. There are two options:\r
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- The homescreen API will provide a signal that is emitted every time the visible status of surfaces changes. This would be way more efficient, because it would save time and avoid a re-occurring API call. __UPDATE:__ There is a D-Bus signal implemented in this API\r
- For Qt, there is already a patch available that provides this information as a base class property. See https://codereview.qt-project.org/#/c/176211/ This would be optimal for Qt widget applications. But not useful for other languages, e.g. Java. __UPDATE:__ This patch got reverted in AGL!\r
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