153 lines
5.1 KiB
C
153 lines
5.1 KiB
C
/* Theming/Multiple Backgrounds
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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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#include <gtk/gtk.h>
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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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const GtkCssLocation *start_location, *end_location;
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GtkTextIter start, end;
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const char *tag_name;
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start_location = gtk_css_section_get_start_location (section);
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gtk_text_buffer_get_iter_at_line_index (buffer,
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&start,
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start_location->lines,
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start_location->line_bytes);
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end_location = gtk_css_section_get_end_location (section);
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gtk_text_buffer_get_iter_at_line_index (buffer,
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&end,
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end_location->lines,
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end_location->line_bytes);
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if (error->domain == GTK_CSS_PARSER_WARNING)
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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_string (provider, text);
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g_free (text);
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}
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static void
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clear_provider (gpointer data)
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{
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GtkStyleProvider *provider = data;
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gtk_style_context_remove_provider_for_display (gdk_display_get_default (), provider);
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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_for_display (gdk_display_get_default (), provider, G_MAXUINT);
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g_object_set_data_full (G_OBJECT (widget), "provider", provider, clear_provider);
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}
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GtkWidget *
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do_css_multiplebgs (GtkWidget *do_widget)
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{
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static GtkWidget *window = NULL;
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if (!window)
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{
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GtkWidget *paned, *overlay, *child, *sw;
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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 ();
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gtk_window_set_title (GTK_WINDOW (window), "Multiple Backgrounds");
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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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gtk_widget_add_css_class (window, "demo");
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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overlay = gtk_overlay_new ();
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gtk_window_set_child (GTK_WINDOW (window), overlay);
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child = gtk_drawing_area_new ();
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/* Don't set a draw_func, since we are only interested in CSS drawing,
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* which happens automatically.
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*/
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gtk_widget_set_name (child, "canvas");
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gtk_overlay_set_child (GTK_OVERLAY (overlay), child);
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child = gtk_button_new ();
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
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gtk_widget_set_name (child, "bricks-button");
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gtk_widget_set_halign (child, GTK_ALIGN_CENTER);
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gtk_widget_set_valign (child, GTK_ALIGN_CENTER);
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gtk_widget_set_size_request (child, 250, 84);
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paned = gtk_paned_new (GTK_ORIENTATION_VERTICAL);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), paned);
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/* Need a filler so we get a handle */
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child = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_paned_set_start_child (GTK_PANED (paned), child);
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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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sw = gtk_scrolled_window_new ();
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gtk_paned_set_end_child (GTK_PANED (paned), sw);
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child = gtk_text_view_new_with_buffer (text);
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gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), 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_multiplebgs/css_multiplebgs.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_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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