QML noob question: Alter default bool

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QML noob question: Alter default bool

asked 2019-05-17 22:08:09 +0300

Sunny
733 ●15 ●25 ●25

updated 2019-05-17 22:18:32 +0300

Hello,

unfortunately I know exactly nothing about QML. Syntax isn't completely cryptic to me, but I'm stuck finding out where some kind of initialization happens after declaration (which I think I found - if one can compare runtime prototype definition and variable declaration... sorry for this ugly blending, I don't speak QML or any other object oriented language well/at all).

So I see that e.g. DisplaySettings.lidSensorEnabled is true by default, as opposed to DisplaySettings.lowPowerModeEnabled.

I guess the setting is predefined in lib/libsystemsettings.so, so at compile time. Is there a way to change the bool at system startup time?

Thanks, -harry

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try this: https://doc.qt.io/qt-5/qml-qtqml-component.html#completed-signal

coderus ( 2019-05-18 00:16:10 +0300 )edit

try this: https://doc.qt.io/qt-5/qml-qtqml-component.html#completed-signal
coderus ( 2019-05-18 00:16:10 +0300 )edit

Accepted Answer

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answered 2019-05-18 08:43:37 +0300

spiiroin
13237 ●151 ●224 ●199

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Under the hood DisplaySettings.lidSensorEnabled is mapped to mce setting, i.e. toggling the bool value from qml does the same thing as running mcetool from cli:

mcetool  --set-lid-sensor-mode=<enabled|disabled>

Note that the value persists over application / device restarts. The initial value of the QML property should reflect whatever the underlying setting value is, i.e. it is not always True by default.

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Thanks a lot, very valuable insight :-)

I know that there is 'mcetool' and where it comes from, but nothing about the real "backend" nor integration. But this explains my observations. Will use it to do my desired altering.

Sunny ( 2019-05-20 09:23:37 +0300 )edit

@Summy: qt/qml <--dbus--> mce happens here: https://git.merproject.org/mer-core/nemo-qml-plugin-systemsettings/blob/master/src/displaysettings.cpp

The way it works is roughly:

Hard coded "sane enough" values are set up from constructor
Async dbus query is started to get actual settings from mce
Upon getting a reply, setting values are updated and finally "populated" property is set to true

Which basically means: If you really want/need to ignore short living blibs caused by delta between assumed and actual values, it can be done by not acting on setting values while populated is false.

spiiroin ( 2019-05-20 10:51:06 +0300 )edit

QML noob question: Alter default bool

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QML noob question: Alter default bool

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