Window.addOnCreateSurface

The ::create-surface signal is emitted when an offscreen window needs its surface (re)created, which happens either when the the window is first drawn to, or when the window is being resized. The first signal handler that returns a non-NULL surface will stop any further signal emission, and its surface will be used. Note that it is not possible to access the window's previous surface from within any callback of this signal. Calling gdk_offscreen_window_get_surface() will lead to a crash. Since 3.0

class Window
void
addOnCreateSurface

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