----- Original Message ----- > From: "Hans de Goede" <[email protected]> > To: "Marc-André Lureau" <[email protected]> > Cc: "Virt Tools" <[email protected]> > Sent: Friday, September 20, 2013 9:47:09 AM > Subject: Re: [virt-tools-list] virt-viewer: Having per window full-screen > state causes monitor arrangement issues > > Hi, > > On 09/20/2013 04:22 PM, Marc-André Lureau wrote: > > <snip> > > >> For now I would stick with what I've suggested, so keep the current > >> ltr auto-align, while adding code to make sure we update coordinates > >> whenever necessary + use physical monitor coordinates in the all > >> monitors full-screen case. > > > > I think it's equally bad (if not worse) that monitors are "swaped" whether > > they are all in fullscreen or not (in your example) (you will get your > > startmenu/taskbar jumping from window/monitor) > > They won't get swapped, the current auto-ltr align code already puts > windows in the ltr order they are in on the client machine.
This is only partially true. The auto-ltr alignment code puts windows in the ltr order that they *were in on the client machine at the point when each window was last resized*. If you then move this window to a different point on the screen, that new position is not used to determine how to arrange the monitors *until it is resized*. And actually, even this is a bit of a lie. In reality, it uses the last *adjusted* position at the time of resizing to calculate alignment. Consider the following situation: Display A is a 400x400 window at (100, 100) Display B is a 400x400 window at (800, 200) The auto-alignment algorithm will place these two displays as follows: - A -> 400x400 @ (0, 0) - B -> 400x400 @ (400, 0) So far, so good: the displays are aligned in the expected order with no gap between them. Now, let's say that we swap the arrangement of these windows so that display B is to the left of A. Specifically: Display B is a 400x400 window at (100, 100) Display A is a 400X400 window at (800, 200) Nothing changes when we move the windows on the client, which is as it should be (we wouldn't want the displays to get re-arranged simply by dragging a window around). But now let's say that we resize Display B to be 600x600. Since Window A was not resized, its position will not be updated at all. So when the auto-align algorithm runs, it will try to lay out these windows left-to-right but it will use the position (100, 100) for window B and the position (0, 0) for window A (which is the adjusted position at the time of the last resize of window A). It will calculate that window A (0, 0) is closer to the origin than window B (100, 100) is, which results in the following auto-aligned layout: - A -> 400x400 @ (0, 0) - B -> 600x600 @ (400, 0) Clearly not quite what we want, since Window B is actually to the left of Window A on the client. But the alignment in the guest is such that Display A is to the left of Display B. So regardless of whether display swapping happens during fullscreen/un-fullscreen or not, we need to find a much smarter method of alignment for multiple displays. > > So if you have disp1 and disp2 in the guest, and you've disp2 on > the left monitor of your client machine and disp1 right, then the > auto-align code will already put disp2 first in the ltr ordering (*). > > So if you then fullscreen both no swapping will happen. > > Regards, > > Hans > > *) Or at least that is how it used to be, it seems that this is broken > now too. > > _______________________________________________ > virt-tools-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/virt-tools-list _______________________________________________ virt-tools-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/virt-tools-list
