diff options
Diffstat (limited to 'demos/gtk-demo/css_multiplebgs.c')
| -rw-r--r-- | demos/gtk-demo/css_multiplebgs.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/demos/gtk-demo/css_multiplebgs.c b/demos/gtk-demo/css_multiplebgs.c new file mode 100644 index 0000000000..776480a65d --- /dev/null +++ b/demos/gtk-demo/css_multiplebgs.c @@ -0,0 +1,170 @@ +/* CSS Theming/Multiple Backgrounds + * + * Gtk themes are written using CSS. Every widget is build of multiple items + * that you can style very similarly to a regular website. + * + */ + +#include <gtk/gtk.h> + +static GtkWidget *window = NULL; + +static void +show_parsing_error (GtkCssProvider *provider, + GtkCssSection *section, + const GError *error, + GtkTextBuffer *buffer) +{ + GtkTextIter start, end; + const char *tag_name; + + gtk_text_buffer_get_iter_at_line_index (buffer, + &start, + gtk_css_section_get_start_line (section), + gtk_css_section_get_start_position (section)); + gtk_text_buffer_get_iter_at_line_index (buffer, + &end, + gtk_css_section_get_end_line (section), + gtk_css_section_get_end_position (section)); + + if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED)) + tag_name = "warning"; + else + tag_name = "error"; + + gtk_text_buffer_apply_tag_by_name (buffer, tag_name, &start, &end); +} + +static void +css_text_changed (GtkTextBuffer *buffer, + GtkCssProvider *provider) +{ + GtkTextIter start, end; + char *text; + + gtk_text_buffer_get_start_iter (buffer, &start); + gtk_text_buffer_get_end_iter (buffer, &end); + gtk_text_buffer_remove_all_tags (buffer, &start, &end); + + text = gtk_text_buffer_get_text (buffer, &start, &end, FALSE); + gtk_css_provider_load_from_data (provider, text, -1, NULL); + g_free (text); + + gtk_style_context_reset_widgets (gdk_screen_get_default ()); +} + +static gboolean +drawing_area_draw (GtkWidget *widget, + cairo_t *cr) +{ + GtkStyleContext *context = gtk_widget_get_style_context (widget); + + gtk_render_background (context, cr, + 0, 0, + gtk_widget_get_allocated_width (widget), + gtk_widget_get_allocated_height (widget)); + gtk_render_frame (context, cr, + 0, 0, + gtk_widget_get_allocated_width (widget), + gtk_widget_get_allocated_height (widget)); + + return FALSE; +} + +static void +apply_css (GtkWidget *widget, GtkStyleProvider *provider) +{ + gtk_style_context_add_provider (gtk_widget_get_style_context (widget), provider, G_MAXUINT); + if (GTK_IS_CONTAINER (widget)) + gtk_container_forall (GTK_CONTAINER (widget), (GtkCallback) apply_css, provider); +} + +GtkWidget * +do_css_multiplebgs (GtkWidget *do_widget) +{ + if (!window) + { + GtkWidget *paned, *container, *child, *b; + GtkStyleProvider *provider; + GtkTextBuffer *text; + GBytes *bytes; + + window = gtk_window_new (GTK_WINDOW_TOPLEVEL); + gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (do_widget)); + gtk_window_set_default_size (GTK_WINDOW (window), 400, 300); + g_signal_connect (window, "destroy", + G_CALLBACK (gtk_widget_destroyed), &window); + + container = gtk_overlay_new (); + gtk_widget_add_events (container, + GDK_ENTER_NOTIFY_MASK | + GDK_LEAVE_NOTIFY_MASK | + GDK_POINTER_MOTION_MASK); + gtk_container_add (GTK_CONTAINER (window), container); + + child = gtk_drawing_area_new (); + gtk_widget_set_name (child, "canvas"); + g_signal_connect (child, "draw", + G_CALLBACK (drawing_area_draw), NULL); + gtk_container_add (GTK_CONTAINER (container), child); + + child = gtk_button_new (); + gtk_widget_add_events (child, + GDK_ENTER_NOTIFY_MASK | + GDK_LEAVE_NOTIFY_MASK | + GDK_POINTER_MOTION_MASK); + gtk_overlay_add_overlay (GTK_OVERLAY (container), child); + gtk_widget_set_name (child, "bricks-button"); + gtk_widget_set_halign (child, GTK_ALIGN_CENTER); + gtk_widget_set_valign (child, GTK_ALIGN_CENTER); + gtk_widget_set_size_request (child, 200, 80); + + paned = gtk_paned_new (GTK_ORIENTATION_VERTICAL); + gtk_overlay_add_overlay (GTK_OVERLAY (container), paned); + + /* Need a filler so we get a handle */ + child = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0); + gtk_container_add (GTK_CONTAINER (paned), child); + + text = gtk_text_buffer_new (NULL); + gtk_text_buffer_create_tag (text, + "warning", + "underline", PANGO_UNDERLINE_SINGLE, + NULL); + gtk_text_buffer_create_tag (text, + "error", + "underline", PANGO_UNDERLINE_ERROR, + NULL); + + provider = GTK_STYLE_PROVIDER (gtk_css_provider_new ()); + + container = gtk_scrolled_window_new (NULL, NULL); + gtk_container_add (GTK_CONTAINER (paned), container); + child = gtk_text_view_new_with_buffer (text); + gtk_container_add (GTK_CONTAINER (container), child); + g_signal_connect (text, + "changed", + G_CALLBACK (css_text_changed), + provider); + + bytes = g_resources_lookup_data ("/css_multiplebgs/gtk.css", 0, NULL); + gtk_text_buffer_set_text (text, g_bytes_get_data (bytes, NULL), g_bytes_get_size (bytes)); + + g_signal_connect (provider, + "parsing-error", + G_CALLBACK (show_parsing_error), + gtk_text_view_get_buffer (GTK_TEXT_VIEW (child))); + + apply_css (window, provider); + } + + if (!gtk_widget_get_visible (window)) + gtk_widget_show_all (window); + else + { + gtk_widget_destroy (window); + window = NULL; + } + + return window; +} |