Trait gtk4::prelude::PrintOperationPreviewExt

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pub trait PrintOperationPreviewExt: 'static {
    // Required methods
    fn end_preview(&self);
    fn is_selected(&self, page_nr: i32) -> bool;
    fn render_page(&self, page_nr: i32);
    fn connect_got_page_size<F: Fn(&Self, &PrintContext, &PageSetup) + 'static>(
        &self,
        f: F
    ) -> SignalHandlerId;
    fn connect_ready<F: Fn(&Self, &PrintContext) + 'static>(
        &self,
        f: F
    ) -> SignalHandlerId;
}
Expand description

Trait containing all PrintOperationPreview methods.

Implementors

PrintOperationPreview, PrintOperation

Required Methods§

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fn end_preview(&self)

Ends a preview.

This function must be called to finish a custom print preview.

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fn is_selected(&self, page_nr: i32) -> bool

Returns whether the given page is included in the set of pages that have been selected for printing.

page_nr

a page number

Returns

true if the page has been selected for printing

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fn render_page(&self, page_nr: i32)

Renders a page to the preview.

This is using the print context that was passed to the preview handler together with @self.

A custom print preview should use this function to render the currently selected page.

Note that this function requires a suitable cairo context to be associated with the print context.

page_nr

the page to render

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fn connect_got_page_size<F: Fn(&Self, &PrintContext, &PageSetup) + 'static>( &self, f: F ) -> SignalHandlerId

Emitted once for each page that gets rendered to the preview.

A handler for this signal should update the @context according to @page_setup and set up a suitable cairo context, using PrintContext::set_cairo_context().

context

the current PrintContext

page_setup

the PageSetup for the current page

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fn connect_ready<F: Fn(&Self, &PrintContext) + 'static>( &self, f: F ) -> SignalHandlerId

The ::ready signal gets emitted once per preview operation, before the first page is rendered.

A handler for this signal can be used for setup tasks.

context

the current PrintContext

Implementors§