[vlc-devel] Mouse hiding

Steve Lhomme robux4 at gmail.com
Tue Aug 8 11:03:12 CEST 2017

On Mon, Aug 7, 2017 at 5:20 PM, Rémi Denis-Courmont <remi at remlab.net> wrote:
> Le maanantaina 7. elokuuta 2017, 14.59.29 EEST Steve Lhomme a écrit :
>> I'm trying to understand how mouse hiding is supposed to work to fix #17819.
>> Right now it's broken on Windows and maybe OS X as well.
>> Is it always the responsibility of the vout_window_t to hide the mouse?
> This is the description from Thomas:
> | core: vout: add VOUT_WINDOW_HIDE_MOUSE
> |
> | A window can now hide the mouse cursor. If this control is not implemented
> | by a "vout window" module, the control will be sent to the "vout display"
> | module.
> I believe that it is meant to be either the window or the display, but not
> both. Indeed, I can´t really imagine how the responsibility could functionally
> be shared.
>> I suppose that's why VOUT_DISPLAY_HIDE_MOUSE is deprecated ?
> As of last week, I think that both VOUT_DISPLAY_HIDE_MOUSE and
> VOUT_WINDOW_HIDE_MOUSE should be deprecated. The component tracking mouse
> movement is in better position to run the hiding timer than the video output
> core thread.
> From the core, we only need a symbolic constant, probably in <vlc_mouse.h>, to
> convey a shared timeout value.

How is this supposed to work with libvlc usage. Do we want to hide the
mouse for host apps as well ?

>> Right now it's not being called even though needs_hide_mouse is set because
>> vout_HideWindowMouse() is successful.
> According to my interpretation of Thomas´ commit message, this is intended.
>> In the Qt interface MainInterface::setHideMouse() is called properly
>> with show/hide but it has absolutely zero impact. Is it the same on
>> other platform than Windows?
> It works fine on X11. I have not tested on Wayland.
> But in those two windowing systems, the vout display plugins do not perform
> any mouse handling, or in fact any input device handling at all.
>> Maybe a regression of Qt 5 ? I could
>> call win32 ShowCursor() in there and it works but it seems dirty.
> I don´t know that it would be a regression. The code was added in 3.0 cycle.
> The most obvious potential culprit to me would be -interference with- the
> common code in Win32 display plugins.

That might be. stackCentralW->setCursor( Qt::BlankCursor ) works on
Windows but not videoWidget->setCursor( Qt::BlankCursor ) so there
must be something else at play.

> --
> 雷米‧德尼-库尔蒙
> https://www.remlab.net/
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