gtk: present the framebuffer (size the picture, tick the frame clock) - #93
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The GTK4-hosted window came up blank: the GtkPicture was Put into the GtkFixed at 0,0 with no size, and a GtkFixed gives each child its requested size — a content-less GtkPicture requests 0×0, so the framebuffer was laid out invisibly. Size the picture to the logical window. And present every frame, not once. Run() drew a single frame before the window was mapped (the frame clock had not started) and before an immediate-mode app's Surface had any content — so it froze empty. Drive frame() from Widget.AddTickCallback (go-gtk v0.2.4): the GdkFrameClock ticks while the window is mapped, quiescent when not; syncNative reconciles controls by key, so ticking never rebuilds them. Proven end to end: go-news-reader -window under Xvfb now renders its full UI (topbar with the overlaid native GtkEntry search field, sidebar, item list, preview) at ~57fps through go-gtk/purego, CGO=0. Bumps go-gtk v0.2.1 → v0.2.4.
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The GTK4-hosted window came up blank, on two counts:
GtkPicturewasPutinto theGtkFixedat 0,0 with no size; a GtkFixed gives each child its requested size, and a content-less GtkPicture requests 0×0 — so the framebuffer was laid out invisibly. Now sized to the logical window.Run()presented one frame, before the window was mapped (frame clock not started) and before an immediate-mode app's Surface had content — freezing empty. Now driven byWidget.AddTickCallback(go-gtk v0.2.4): the GdkFrameClock ticks while mapped, quiescent when not;syncNativereconciles controls by key, so ticking never rebuilds them or fights a caret.Proven end-to-end:
go-news-reader -windowunder Xvfb now renders its full UI (topbar with the overlaid native GtkEntry search field, sidebar, item list, preview) through go-gtk/purego, CGO=0. Bumps go-gtk v0.2.1 → v0.2.4.