Hi,
I solved it by slightly digging in the method calls to see if there was a
way to deviate how things were handled. Found that when a component gets
called, the method scrollComponentToVisible() is called. So since my
textarea is inside the form's layered pane, what I did was to override that
method:
@Override
public void scrollComponentToVisible(Component c) {
if (!this.getLayeredPane().contains(c)){
super.scrollComponentToVisible(c);
}
}
Now, when this method is called for a control in the form's layered pane,
the form won't update its scroll position. And this works.
If there's a better way to solve it please advise.
Thanks in advance.
Carlos.
El viernes, 7 de junio de 2019, 10:54:27 (UTC+2), [email protected]
escribió:
>
> Hi there,
>
> I am developing a short chat application. My layout structure is a
> BoxLayout.y() for the form where I append each of the message containers,
> and then in the layeredpane of the form, via
> a BoxLayout(BoxLayout.Y_AXIS_BOTTOM_LAST), I include the input pane to
> enter the message text and the send message button. So far so good, and
> everything works smoothly.
>
> When we get to fully occupy the area of appended messages and overflow the
> available area of the form, the expected behaviour is to expand the
> container, and enable navigation via vertical scrolling. A behaviour
> requirement is aswell to scroll to the bottommost message when new messages
> are appended. So far so good.
>
> The point is that when we are at the bottom of the container in the scroll
> position, when the TextArea control of the inputpane gains focus, the
> scroll position of the form gets screwed and the form turns to the top
> position of the scrolling, hence displaying the first appended message
> instead of the last.
>
> Since this seems to be a default behaviour can't figure out how to
> approach a solution. I have tried to apply the same logic as to when new
> messages are appended with no luck.
>
>
> Does anyone have an idea how to solve it?
>
> Regards and thanks for your time.
>
> Carlos.
>
>
>
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