*
Introducing a new event system architecture in Nux 1.0*
The event processing in Nux needed to change for Unity. The previous
architecture was no longer fitting. The new system is, I believe, less
complex than the previous one, and it leaves a lot of dead code that
will be progressively removed.
The heart of the new architecture is in these functions:
* ::FindAreaUnderMouse
* Area::TestMousePointerInclusion
* WindowCompositor::MouseEventCycle
* WindowCompositor::KeyboardEventCycle
InputArea::OnEvent is no longer needed. That function was too large and
too complex. Now, when you create a new widget and you need to implement
FindAreaUnderMouse, all you have to do is find the Area that is just
below the mouse pointer.
There are a few things you have to do for the system to work smoothly.
You have to make sure that all widgets have a parent:
* When a widget is added to a layout, the layout becomes it parent.
You have nothing to do in this case.
* If you have a Button widget inside another MyWidget class, and you
don't add that button to MyWidget's layout, then you need to call
button->SetParentObject(this) for the button to become a child of
the MyWidget object.
* To un-parent a widget, call UnParentObject. For now do not call
UnParentObject on a widget that is in a layout. Always match a
call to UnParentObject with a previous call to SetParentObject.
*How does this affect Unity?*
The changes required in Unity where not substantial. However, there are
some pending issues:
* There is a regression in the Dash keyboard navigation. You cannot
use the left, right, down and up keys to navigate from widget to
widget in the Dash.
* You have to click on the text entry in the Dash search area before
you can enter some text.
* DnD (drag and drop) is not working.
* There is a regression in the speed of the Dash scrolling.
I have probably missed a few more regressions; please report them. These
pending issues will be resolved as quickly as possible. The keyboard
event architecture needs more development and feedback from the team is
needed to make it efficient and robust.
On the positive side, keyboard navigation in the launcher (Alt+F1) and
Quicklist is ok.
If you have pending branches that still rely on the previous event
architecture, let me know and we will port them to the new system.
*Personal Note*
Thank you all for your feedbacks. And thank you for taking Nux to its
1.0.1 release.
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