<AWT Dev> RFR: 8267307: Introduce new client property for XAWT: xawt.mwm_decor_title

[Maxim Kartashev]

On Fri, May 21, 2021 at 12:33 AM Sergey Bylokhov <serb at openjdk.java.net>
wrote:

> On Wed, 19 May 2021 10:23:01 GMT, Maxim Kartashev <github.com+
> 28651297+mkartashev at openjdk.org> wrote:
>
> > This commit introduces a new client property xawt.mwm_decor_title
> implementing JDK-8267307. The property can be set prior to showing a window
> or after the window has been displayed, in which case the window will have
> to be hidden/shown (re-mapped) for the property to take effect.
> >
> > The general idea is to provide control over the "decorations" part of
> the X11 window property called _MOTIF_WM_HINTS. Those "decoration" bits are
> set to 1 (XWindowAttributesData.AWT_DECOR_ALL) to show all the decorations
> or 0 (XWindowAttributesData.AWT_DECOR_NONE) to ask the window manager (WM)
> not to decorate with anything, even borders or resize handles. With
> xawt.mwm_decor_title property set to "true", this commit adds the ability
> to set the bits to 2 (XWindowAttributesData.AWT_DECOR_BORDER), which some
> WMs take as "decorate with only a border", thus effectively removing the
> window's title bar, but still leaving the resize capability.
> >
> > This feature was tested and works correctly on "vanilla" Ubuntu 20.04
> with the "GNOME Shell" window manager. It was also tested with Xfwm4 and
> KDE, where it did not have any effect; these two WMs have limited respected
> for the "decorations" bits of the _MOTIF_WM_HINTS window property.
>
> Hello, thank you for your contribution, One initial question: what the
> name "mwm_" of this property actually means?
>
The name's historical: it's from the _MOTIF_WM_HINTS property of X11 that
has "decorations" bits in it (the 3rd word of the structure). For instance,
this is from a Firefox window in GNOME that does not have a title bar:

$ xprop -id 0x2600003 | grep -i MOTIF_WM_HINTS
_MOTIF_WM_HINTS(_MOTIF_WM_HINTS) = 0x2, 0x0, 0x2, 0x0, 0x0

 Despite the name ("motif"), this property has apparently become a de-facto
standard way to communicate client wishes about its window decoration to
any window manager currently in charge.

>
> -------------
>
> PR: https://git.openjdk.java.net/jdk/pull/4113
>
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