Gets emitted when a preview is requested from the native dialog.
The default handler for this signal uses an external viewer
application to preview.
To implement a custom print preview, an application must return
%TRUE from its handler for this signal. In order to use the
provided @context for the preview implementation, it must be
given a suitable cairo context with
[method@Gtk.PrintContext.set_cairo_context].
The custom preview implementation can use
[method@Gtk.PrintOperationPreview.is_selected] and
[method@Gtk.PrintOperationPreview.render_page] to find pages which
are selected for print and render them. The preview must be
finished by calling [method@Gtk.PrintOperationPreview.end_preview]
(typically in response to the user clicking a close button).
Gets emitted when a preview is requested from the native dialog.
The default handler for this signal uses an external viewer application to preview.
To implement a custom print preview, an application must return %TRUE from its handler for this signal. In order to use the provided @context for the preview implementation, it must be given a suitable cairo context with [method@Gtk.PrintContext.set_cairo_context].
The custom preview implementation can use [method@Gtk.PrintOperationPreview.is_selected] and [method@Gtk.PrintOperationPreview.render_page] to find pages which are selected for print and render them. The preview must be finished by calling [method@Gtk.PrintOperationPreview.end_preview] (typically in response to the user clicking a close button).