preview


Description:

public virtual signal bool preview (PrintOperationPreview preview, PrintContext context, Window? parent)

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 set_cairo_context.

The custom preview implementation can use is_selected and render_page to find pages which are selected for print and render them. The preview must be finished by calling end_preview (typically in response to the user clicking a close button).

Parameters:

preview

the PrintOperationPreview for the current operation

context

the PrintContext that will be used

parent

the Window to use as window parent, or null

Returns:

true if the listener wants to take over control of the preview