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 gtk_print_context_set_cairo_context().
The custom preview implementation can use
gtk_print_operation_preview_is_selected() and
gtk_print_operation_preview_render_page() to find pages which
are selected for print and render them. The preview must be
finished by calling gtk_print_operation_preview_end_preview()
(typically in response to the user clicking a close button).
TRUE if the listener wants to take over control of the preview
Since 2.10
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 gtk_print_context_set_cairo_context(). The custom preview implementation can use gtk_print_operation_preview_is_selected() and gtk_print_operation_preview_render_page() to find pages which are selected for print and render them. The preview must be finished by calling gtk_print_operation_preview_end_preview() (typically in response to the user clicking a close button). TRUE if the listener wants to take over control of the preview Since 2.10