Hello,
as the topic suggests, I am trying to capture a window which should be
printed afterwards.
This is my code:
/* appl_t is a struct created by me which contains "GtkWidget *print_win",
* the window I want to print. Moreover, appl_t contains gints for the
* width and height of the window */
/* callback for my print button */
static void print_cb(appl_t * appl)
{
values_t *val = &appl->values;
GtkPrintOperation *op;
GtkPrintOperationResult res;
output_print(appl); /* This function creates the window which I want
to print */
op = gtk_print_operation_new();
gtk_print_operation_set_n_pages(op, 1);
gtk_print_operation_set_unit(op, GTK_UNIT_MM);
g_signal_connect(op, "draw_page", G_CALLBACK(draw_page), appl);
res =
gtk_print_operation_run(op, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG,
NULL, NULL);
}
}
static void draw_page(GtkPrintOperation * operation,
GtkPrintContext * print_context, gint page_nr,
appl_t * appl)
{
gdouble print_width, print_height, scale;
cairo_t *cr, *cr_win;
cairo_surface_t *surface;
values_t *val = &appl->values;
/* create a surface of the print window */
cr_win = gdk_cairo_create(appl->print_win->window);
/* get width and height of the print window */
gdk_drawable_get_size(appl->print_win->window, &(val->width),
&(val->height));
gtk_widget_hide_all(appl->print_win);
/* create the cairo surface for cr_win */
surface = cairo_get_target(cr_win);
cairo_surface_reference(surface);
cairo_destroy(cr_win);
/* get width and heigth of print_context */
print_width = gtk_print_context_get_width(print_context);
print_height = gtk_print_context_get_height(print_context);
/* transform the print_context into a cairo_context */
cr = gtk_print_context_get_cairo_context(print_context);
scale = (gdouble) print_width / val->width;
/* scale, keep aspect ratio */
cairo_scale(cr, scale, scale);
cairo_set_source_surface(cr, surface, 0., 0.);
cairo_surface_destroy(surface);
cairo_paint(cr);
}
The problem is that the window is often captured with the print dialog.
Furthermore, the window is sometimes "incomplete". The PDF/PS output
shows just parts of the window - it seems that print_win is captured
before it is completely rendered.
Questions:
- Are there any better ways to achieve what I want?
- Can I capture the window without showing it?
Regards,
Fabian
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