[Interest] Qt Quick 5.3.2 wheel event cascade

Jérôme Godbout jerome at bodycad.com
Mon Nov 24 23:12:49 CET 2014


I guess nobody care :-( I will maybe just open a bug report then

On Wed, Nov 12, 2014 at 9:43 AM, Jérôme Godbout <jerome at bodycad.com> wrote:

> Hi,
> I posted to the forum and been ask to forward this on the mailing list.
> Maybe someone can shed some light on the new behavior for the scrollwheel
> and the Qt Quick Controls.
> Here's the forum link: http://qt-project.org/forums/viewthread/48228/
>
> This behavior changed from 5.3.0 (version we are using right now and we
> stick until we can solve this) and the 5.3.2 (haven't check 5.3.1).
>
> Let's assume the following (rectangle are only there to see the scroll
> view effect, 2 sliders to see the under mouse effect):
> import QtQuick 2.3
> import QtQuick.Controls 1.2
>
> Rectangle
> {
>
> ScrollView
>
> {
>
> width: 300
> height: 300
> Column
> {
>
> Rectangle { width: 500; height: 500; color: “red” }
> Slider { }
> Slider { }
> Rectangle { width: 500; height: 500; color: “blue” }
>
> }
>
> }
>
> }
>
> If you use the scroll wheel to control the slider value, you will also
> scroll the scroll view at the same time, This is not only annoying, but we
> cannot accept the event in any way on the control. If like us you have 2D
> UI on top of a 3D UI you scroll on a slider (or any widget for that
> matter):
>
>    1. the slider change value (for a single event, since it will no more
>    under mouse soon enough inside the scroll view)
>    2. the scroll view panel scroll up/down (changing what's under the
>    mouse)
>    3. the 3D view end up zooming in/out.
>
> All on the same mouse event, making a big mess.
>
> The only solution I have for now is to put a mouseArea under every control
> and accept the mouse event or change the Qt Api to send the full event to
> control and be able to accept it.
>
> Have I miss something into the API that could help us to prevent this or
> better control the wanted behavior between cascading or not of the event.
>
> Thanks, reagards,
> Jerome
>
>
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