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37e18b784e
Make one of the GTK logo cursors in the cursors demo use a callback cursor that follows the cursor theme size, to show that that is possible.
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* Cursors
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*
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* Demonstrates a useful set of available cursors. The cursors shown here are the
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* ones defined by CSS, which we assume to be available. The example shows creating
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* cursors by name or from an image, with or without a fallback.
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*/
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#include <gtk/gtk.h>
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static GtkWidget *window = NULL;
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static void
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on_destroy (gpointer data)
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{
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window = NULL;
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}
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static GdkTexture *
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cursor_callback (GdkCursor *cursor,
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int cursor_size,
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double scale,
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int *width,
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int *height,
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int *hotspot_x,
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int *hotspot_y,
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gpointer data)
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{
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GdkPixbuf *pixbuf;
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GdkTexture *texture;
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GError *error = NULL;
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int scaled_size;
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scaled_size = ceil (cursor_size * scale);
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pixbuf = gdk_pixbuf_new_from_resource_at_scale ("/cursors/images/gtk-logo.svg",
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scaled_size, scaled_size,
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TRUE,
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&error);
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if (!pixbuf)
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{
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g_print ("%s\n", error->message);
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g_error_free (error);
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return NULL;
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}
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texture = gdk_texture_new_for_pixbuf (pixbuf);
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g_object_unref (pixbuf);
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*width = cursor_size;
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*height = cursor_size;
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*hotspot_x = 18 * cursor_size / 32.0;
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*hotspot_y = 2 * cursor_size / 32.0;
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return texture;
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}
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GtkWidget *
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do_cursors (GtkWidget *do_widget)
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{
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if (!window)
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{
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GtkBuilder *builder;
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GtkWidget *logo_callback;
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GdkCursor *cursor;
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builder = gtk_builder_new_from_resource ("/cursors/cursors.ui");
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window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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gtk_window_set_display (GTK_WINDOW (window),
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gtk_widget_get_display (do_widget));
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g_signal_connect (window, "destroy",
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G_CALLBACK (on_destroy), NULL);
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logo_callback = GTK_WIDGET (gtk_builder_get_object (builder, "logo_callback"));
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cursor = gdk_cursor_new_from_callback (cursor_callback, NULL, NULL, NULL);
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gtk_widget_set_cursor (logo_callback, cursor);
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g_object_unref (cursor);
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g_object_unref (builder);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_set_visible (window, TRUE);
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else
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gtk_window_destroy (GTK_WINDOW (window));
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return window;
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}
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