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On minimal window managers (fluxbox et al, the in-process XEmbed-tray path) the WM neither centers small windows nor restores their position across a hide -> show round-trip, so the main, Settings, and dialog windows opened in the top-left corner instead of centered. These windows are created Hidden, so Wails' Linux/GTK4 backend skips its post-Show centering pass (gated on !Hidden) and InitialPosition has no effect on an unrealized window. Re-center from Go after Show, gated on the minimal-WM environment via a recenterOnShow predicate (set to xembedTrayAvailable on Linux, nil on macOS/Windows where the WM handles placement). centerWhenReady polls from a background goroutine until the move actually lands -- Center() moves via raw X11, which no-ops while the GdkSurface is still nil and GTK4 realizes it asynchronously after Show(). Also reorder xembed_host_linux.go so the static helpers (xembedTrayAvailable, goMenuItemClicked) sit at the end, after the constructor and methods.
18 lines
820 B
Go
18 lines
820 B
Go
//go:build linux && !(linux && 386)
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package main
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// recenterOnShowPredicate returns the predicate WindowManager uses to decide
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// whether to re-center its Go-shown windows (main, Settings) on each show.
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//
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// On Linux this is xembedTrayAvailable: re-centering is needed only in the
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// minimal-WM / in-process-XEmbed-tray environment, where the window manager
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// neither centers small windows for us nor restores their position across a
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// hide -> show round-trip. The predicate is evaluated per show (not once at
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// startup) because the XEmbed tray can appear after the UI starts — the panel
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// and the autostarted app race at login — and xembedTrayAvailable is a cheap,
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// side-effect-free selection-owner probe, fine to call repeatedly.
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func recenterOnShowPredicate() func() bool {
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return xembedTrayAvailable
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}
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