Package ch.bailu.gtk.gtk

Interface PrintOperation.OnPreview

Enclosing class:

PrintOperation

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface PrintOperation.OnPreview

Method Summary

Modifier and Type	Method	Description
boolean	onPreview(PrintOperationPreview preview, PrintContext context, Window parent)	Gets emitted when a preview is requested from the native dialog.

Method Details

onPreview

boolean onPreview(@Nonnull
 PrintOperationPreview preview,
 @Nonnull
 PrintContext context,
 @Nullable
 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
[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).

Parameters:

preview - the `GtkPrintOperationPreview` for the current operation

context - the `GtkPrintContext` that will be used

parent - the `GtkWindow` to use as window parent

Returns:

%TRUE if the listener wants to take over control of the preview