[Interest] Place a QWidget below a button (and follow it!)
andre at familiesomers.nl
Thu Jun 13 20:38:47 CEST 2013
Op 13-6-2013 19:37, william.crocker at analog.com schreef:
>> In details, I have a widget that will display a floating window when the
>> user clicks on a QToolButton. This floating widget must be placed below
>> the button that summoned its soul, and if the main window moves, the
>> floating window must be positioned in the same place.
> Reimplement the moveEvent of the main window
> (which has the tool button as a child.)
> In it, reevaluate the position of the child
> tool button (to be tracked) and move the
> floating window as required.
> Converting widget positions in and out of the
> global coordinate system will come in handy.
While Bill is right, there is another way that allows you to do this
without changing the main window for it: event filters. That will allow
you to keep all the code you need for this in one place, in the widget
that you want to make move.
What I'd do, is give that widget a constructor argument with a pointer
to the widget to follow around. Using QWidget::window, you find out what
the window is the widget to be followed lives in. Install an event
filter on that window-widget. If you use scrollable views somewhere,
you'll need to iterate up yourself, to install the event filter for
every widget in between too.
In your widget-that-follows, reimplement the eventFilter(QObject*,
QEvent*) method, and look for move and resize events. If you get these,
you again take the geometry of the widget-to-follow, and use the
mapToGlobal function of the widget-to-follow to get the global
coordinates. Then, re-position your widget-that-follows to those
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