mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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123 lines
4.0 KiB
C
123 lines
4.0 KiB
C
/* CSS Theming/CSS Basics
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*
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* Gtk themes are written using CSS. Every widget is build of multiple items
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* that you can style very similarly to a regular website.
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*
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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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show_parsing_error (GtkCssProvider *provider,
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GtkCssSection *section,
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const GError *error,
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GtkTextBuffer *buffer)
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{
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GtkTextIter start, end;
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const char *tag_name;
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gtk_text_buffer_get_iter_at_line_index (buffer,
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&start,
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gtk_css_section_get_start_line (section),
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gtk_css_section_get_start_position (section));
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gtk_text_buffer_get_iter_at_line_index (buffer,
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&end,
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gtk_css_section_get_end_line (section),
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gtk_css_section_get_end_position (section));
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if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
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tag_name = "warning";
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else
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tag_name = "error";
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gtk_text_buffer_apply_tag_by_name (buffer, tag_name, &start, &end);
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}
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static void
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css_text_changed (GtkTextBuffer *buffer,
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GtkCssProvider *provider)
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{
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GtkTextIter start, end;
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char *text;
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gtk_text_buffer_get_start_iter (buffer, &start);
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gtk_text_buffer_get_end_iter (buffer, &end);
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gtk_text_buffer_remove_all_tags (buffer, &start, &end);
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text = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
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gtk_css_provider_load_from_data (provider, text, -1, NULL);
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g_free (text);
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gtk_style_context_reset_widgets (gdk_screen_get_default ());
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}
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static void
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apply_css (GtkWidget *widget, GtkStyleProvider *provider)
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{
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gtk_style_context_add_provider (gtk_widget_get_style_context (widget), provider, G_MAXUINT);
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if (GTK_IS_CONTAINER (widget))
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gtk_container_forall (GTK_CONTAINER (widget), (GtkCallback) apply_css, provider);
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}
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GtkWidget *
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do_css_basics (GtkWidget *do_widget)
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{
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if (!window)
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{
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GtkWidget *container, *child;
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GtkStyleProvider *provider;
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GtkTextBuffer *text;
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GBytes *bytes;
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (do_widget));
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gtk_window_set_default_size (GTK_WINDOW (window), 400, 300);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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text = gtk_text_buffer_new (NULL);
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gtk_text_buffer_create_tag (text,
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"warning",
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"underline", PANGO_UNDERLINE_SINGLE,
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NULL);
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gtk_text_buffer_create_tag (text,
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"error",
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"underline", PANGO_UNDERLINE_ERROR,
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NULL);
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provider = GTK_STYLE_PROVIDER (gtk_css_provider_new ());
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container = gtk_scrolled_window_new (NULL, NULL);
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gtk_container_add (GTK_CONTAINER (window), container);
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child = gtk_text_view_new_with_buffer (text);
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gtk_container_add (GTK_CONTAINER (container), child);
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g_signal_connect (text,
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"changed",
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G_CALLBACK (css_text_changed),
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provider);
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bytes = g_resources_lookup_data ("/css_basics/css_basics.css", 0, NULL);
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gtk_text_buffer_set_text (text, g_bytes_get_data (bytes, NULL), g_bytes_get_size (bytes));
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g_bytes_unref (bytes);
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g_signal_connect (provider,
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"parsing-error",
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G_CALLBACK (show_parsing_error),
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gtk_text_view_get_buffer (GTK_TEXT_VIEW (child)));
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apply_css (window, provider);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show_all (window);
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else
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{
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gtk_widget_destroy (window);
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window = NULL;
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}
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return window;
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}
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