forked from AuroraMiddleware/gtk
637 lines
22 KiB
C
637 lines
22 KiB
C
/* Foreign drawing
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*
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* Many applications can't use GTK+ widgets, for a variety of reasons,
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* but still want their user interface to appear integrated with the
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* rest of the desktop, and follow GTK+ themes. This demo shows how to
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* use GtkStyleContext and the gtk_render_ APIs to achieve this.
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*
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* Note that this is a very simple, non-interactive example and does
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* not show how to come up with theme-compliant sizes by using CSS padding,
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* margins and min-width or min-height.
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*/
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#include <gtk/gtk.h>
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#include <string.h>
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static void
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append_element (GtkWidgetPath *path,
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const char *selector)
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{
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static const struct {
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const char *name;
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GtkStateFlags state_flag;
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} pseudo_classes[] = {
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{ "active", GTK_STATE_FLAG_ACTIVE },
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{ "hover", GTK_STATE_FLAG_PRELIGHT },
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{ "selected", GTK_STATE_FLAG_SELECTED },
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{ "disabled", GTK_STATE_FLAG_INSENSITIVE },
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{ "indeterminate", GTK_STATE_FLAG_INCONSISTENT },
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{ "focus", GTK_STATE_FLAG_FOCUSED },
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{ "backdrop", GTK_STATE_FLAG_BACKDROP },
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{ "dir(ltr)", GTK_STATE_FLAG_DIR_LTR },
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{ "dir(rtl)", GTK_STATE_FLAG_DIR_RTL },
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{ "link", GTK_STATE_FLAG_LINK },
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{ "visited", GTK_STATE_FLAG_VISITED },
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{ "checked", GTK_STATE_FLAG_CHECKED },
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{ "drop(active)", GTK_STATE_FLAG_DROP_ACTIVE }
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};
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const char *next;
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char *name;
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char type;
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guint i;
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next = strpbrk (selector, "#.:");
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if (next == NULL)
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next = selector + strlen (selector);
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name = g_strndup (selector, next - selector);
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if (g_ascii_isupper (selector[0]))
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{
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GType gtype;
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gtype = g_type_from_name (name);
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if (gtype == G_TYPE_INVALID)
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{
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g_critical ("Unknown type name `%s'", name);
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g_free (name);
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return;
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}
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gtk_widget_path_append_type (path, gtype);
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}
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else
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{
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/* Omit type, we're using name */
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gtk_widget_path_append_type (path, G_TYPE_NONE);
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gtk_widget_path_iter_set_object_name (path, -1, name);
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}
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g_free (name);
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while (*next != '\0')
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{
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type = *next;
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selector = next + 1;
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next = strpbrk (selector, "#.:");
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if (next == NULL)
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next = selector + strlen (selector);
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name = g_strndup (selector, next - selector);
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switch (type)
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{
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case '#':
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gtk_widget_path_iter_set_name (path, -1, name);
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break;
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case '.':
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gtk_widget_path_iter_add_class (path, -1, name);
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break;
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case ':':
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for (i = 0; i < G_N_ELEMENTS (pseudo_classes); i++)
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{
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if (g_str_equal (pseudo_classes[i].name, name))
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{
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gtk_widget_path_iter_set_state (path,
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-1,
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gtk_widget_path_iter_get_state (path, -1)
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| pseudo_classes[i].state_flag);
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break;
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}
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}
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if (i == G_N_ELEMENTS (pseudo_classes))
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g_critical ("Unknown pseudo-class :%s", name);
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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g_free (name);
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}
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}
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static GtkStyleContext *
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get_style (GtkStyleContext *parent,
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const char *selector)
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{
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GtkWidgetPath *path;
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GtkStyleContext *context;
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if (parent)
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path = gtk_widget_path_copy (gtk_style_context_get_path (parent));
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else
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path = gtk_widget_path_new ();
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append_element (path, selector);
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context = gtk_style_context_new ();
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gtk_style_context_set_path (context, path);
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gtk_style_context_set_parent (context, parent);
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/* Unfortunately, we have to explicitly set the state again here
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* for it to take effect
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*/
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gtk_style_context_set_state (context, gtk_widget_path_iter_get_state (path, -1));
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gtk_widget_path_unref (path);
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return context;
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}
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static void
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draw_menu (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height)
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{
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GtkStyleContext *menu_context;
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GtkStyleContext *menuitem_context;
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GtkStyleContext *hovermenuitem_context;
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GtkStyleContext *arrowmenuitem_context;
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GtkStyleContext *checkmenuitem_context;
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GtkStyleContext *radiomenuitem_context;
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GtkStyleContext *disablemenuitem_context;
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GtkStyleContext *separatormenuitem_context;
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/* This information is taken from the GtkMenu docs, see "CSS nodes" */
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menu_context = get_style (gtk_widget_get_style_context(widget), "menu");
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gtk_render_background (menu_context, cr, x, y, width, height);
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gtk_render_frame (menu_context, cr, x, y, width, height);
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hovermenuitem_context = get_style (menu_context, "menuitem:hover");
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gtk_render_background (hovermenuitem_context, cr, x, y, width, 20);
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gtk_render_frame (hovermenuitem_context, cr, x, y, width, 20);
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/* arrow for left to right */
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arrowmenuitem_context = get_style (hovermenuitem_context, "arrow:dir(ltr)");
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gtk_render_arrow (arrowmenuitem_context, cr, G_PI / 2, x + width - 20, y, 20);
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g_object_unref (arrowmenuitem_context);
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menuitem_context = get_style (menu_context, "menuitem");
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gtk_render_background (menuitem_context, cr, x, y + 20, width, 20);
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gtk_render_frame (menuitem_context, cr, x, y + 20, width, 20);
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disablemenuitem_context = get_style (menu_context, "menuitem:disabled");
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/* arrow for right to left, sensitive */
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arrowmenuitem_context = get_style (menuitem_context, "arrow:dir(rtl)");
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gtk_render_arrow (arrowmenuitem_context, cr, G_PI / 2, x, y + 20, 20);
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g_object_unref (arrowmenuitem_context);
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/* arrow for right to left, insensitive */
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arrowmenuitem_context = get_style (disablemenuitem_context, "arrow:dir(rtl)");
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gtk_render_arrow (arrowmenuitem_context, cr, G_PI / 2, x + width - 20, y + 20, 20);
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gtk_render_background (menuitem_context, cr, x, y + 40, width, 20);
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gtk_render_frame (menuitem_context, cr, x, y + 40, width, 20);
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/* check enabled, sensitive */
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checkmenuitem_context = get_style (menuitem_context, "check:checked");
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gtk_render_frame (checkmenuitem_context, cr, x + 2, y + 40, 16, 16);
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gtk_render_check (checkmenuitem_context, cr, x + 2, y + 40, 16, 16);
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g_object_unref (checkmenuitem_context);
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/* check unchecked, insensitive */
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checkmenuitem_context = get_style (disablemenuitem_context, "check");
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gtk_render_frame (checkmenuitem_context, cr, x + width - 18, y + 40, 16, 16);
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gtk_render_check (checkmenuitem_context, cr, x + width - 18, y + 40, 16, 16);
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/* draw separator */
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separatormenuitem_context = get_style (menuitem_context, "separator:disabled");
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gtk_render_line (separatormenuitem_context, cr, x + 1, y + 60, x + width - 2, y + 60);
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gtk_render_background (menuitem_context, cr, x, y + 70, width, 20);
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gtk_render_frame (menuitem_context, cr, x, y + 70, width, 20);
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/* radio checked, sensitive */
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radiomenuitem_context = get_style (menuitem_context, "radio:checked");
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gtk_render_frame (radiomenuitem_context, cr, x + 2, y + 70, 16, 16);
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gtk_render_option (radiomenuitem_context, cr, x + 2, y + 70, 16, 16);
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g_object_unref (radiomenuitem_context);
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/* radio unchecked, insensitive */
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radiomenuitem_context = get_style (disablemenuitem_context, "radio");
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gtk_render_frame (radiomenuitem_context, cr, x + width - 18, y + 70, 16, 16);
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gtk_render_option (radiomenuitem_context, cr, x + width - 18, y + 70, 16, 16);
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g_object_unref (separatormenuitem_context);
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g_object_unref (disablemenuitem_context);
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g_object_unref (radiomenuitem_context);
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g_object_unref (checkmenuitem_context);
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g_object_unref (arrowmenuitem_context);
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g_object_unref (hovermenuitem_context);
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g_object_unref (menuitem_context);
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g_object_unref (menu_context);
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}
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static void
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draw_menubar (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height)
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{
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GtkStyleContext *menubar_context;
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GtkStyleContext *menuitem_context;
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gint item_width = width / 3;
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/* This information is taken from the GtkMenuBar docs, see "CSS nodes" */
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menubar_context = get_style (NULL, "menubar.background");
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gtk_render_background (menubar_context, cr, x, y, width, height);
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gtk_render_frame (menubar_context, cr, x, y, width, height);
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menuitem_context = get_style (menubar_context, "menuitem:hover");
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gtk_render_background (menuitem_context, cr, x, y, item_width, 20);
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gtk_render_frame (menuitem_context, cr, x, y, item_width, 20);
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gtk_render_background (menuitem_context, cr, x + item_width * 2, y, item_width, 20);
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gtk_render_frame (menuitem_context, cr, x + item_width * 2, y, item_width, 20);
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g_object_unref (menuitem_context);
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g_object_unref (menubar_context);
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}
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static void
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draw_notebook (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height)
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{
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GtkStyleContext *notebook_context;
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GtkStyleContext *header_context;
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GtkStyleContext *tabs_context;
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GtkStyleContext *tab_context;
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GtkStyleContext *stack_context;
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gint header_height = 40;
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/* This information is taken from the GtkNotebook docs, see "CSS nodes" */
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notebook_context = get_style (NULL, "notebook.frame");
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gtk_render_background (notebook_context, cr, x, y, width, height);
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gtk_render_frame (notebook_context, cr, x, y, width, height);
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header_context = get_style (notebook_context, "header.top");
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gtk_render_background (header_context, cr, x, y, width, header_height);
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gtk_render_frame (header_context, cr, x, y, width, header_height);
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tabs_context = get_style (header_context, "tabs");
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gtk_render_background (tabs_context, cr, x, y, width, header_height);
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gtk_render_frame (tabs_context, cr, x, y, width, header_height);
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tab_context = get_style (tabs_context, "tab:active");
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gtk_render_background (tab_context, cr, x, y, width/2, header_height);
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gtk_render_frame (tab_context, cr, x, y, width/2, header_height);
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g_object_unref (tab_context);
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tab_context = get_style (tabs_context, "tab");
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gtk_render_background (tab_context, cr, x + width/2, y, width/2, header_height);
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gtk_render_frame (tab_context, cr, x + width/2, y, width/2, header_height);
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stack_context = get_style (notebook_context, "stack");
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gtk_render_background (stack_context, cr, x, y + header_height, width, height - header_height);
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gtk_render_frame (stack_context, cr, x, y + header_height, width, height - header_height);
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g_object_unref (stack_context);
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g_object_unref (tab_context);
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g_object_unref (tabs_context);
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g_object_unref (header_context);
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g_object_unref (notebook_context);
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}
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static void
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draw_horizontal_scrollbar (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height,
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gint position,
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GtkStateFlags state)
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{
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GtkStyleContext *scrollbar_context;
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GtkStyleContext *contents_context;
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GtkStyleContext *trough_context;
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GtkStyleContext *slider_context;
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/* This information is taken from the GtkScrollbar docs, see "CSS nodes" */
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scrollbar_context = get_style (NULL, "scrollbar.horizontal");
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contents_context = get_style (scrollbar_context, "contents");
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trough_context = get_style (contents_context, "trough");
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slider_context = get_style (trough_context, "slider");
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gtk_style_context_set_state (scrollbar_context, state);
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gtk_style_context_set_state (contents_context, state);
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gtk_style_context_set_state (trough_context, state);
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gtk_style_context_set_state (slider_context, state);
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gtk_render_background (scrollbar_context, cr, x, y, width, height);
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gtk_render_frame (scrollbar_context, cr, x, y, width, height);
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gtk_render_background (contents_context, cr, x, y, width, height);
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gtk_render_frame (contents_context, cr, x, y, width, height);
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gtk_render_background (trough_context, cr, x, y, width, height);
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gtk_render_frame (trough_context, cr, x, y, width, height);
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/* The theme uses negative margins, this is where the -1 comes from */
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gtk_render_background (slider_context, cr, x + position, y - 1, 30, height + 2);
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gtk_render_frame (slider_context, cr, x + position, y - 1, 30, height + 2);
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g_object_unref (slider_context);
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g_object_unref (trough_context);
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g_object_unref (contents_context);
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g_object_unref (scrollbar_context);
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}
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static void
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draw_text (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height,
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const gchar *text,
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GtkStateFlags state)
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{
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GtkStyleContext *label_context;
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GtkStyleContext *selection_context;
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GtkStyleContext *context;
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PangoLayout *layout;
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/* This information is taken from the GtkLabel docs, see "CSS nodes" */
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label_context = get_style (NULL, "label.view");
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selection_context = get_style (label_context, "selection");
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gtk_style_context_set_state (label_context, state);
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if (state & GTK_STATE_FLAG_SELECTED)
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context = selection_context;
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else
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context = label_context;
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layout = gtk_widget_create_pango_layout (widget, text);
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gtk_render_background (context, cr, x, y, width, height);
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gtk_render_frame (context, cr, x, y, width, height);
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gtk_render_layout (context, cr, x, y, layout);
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g_object_unref (layout);
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g_object_unref (selection_context);
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g_object_unref (label_context);
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}
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static void
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draw_check (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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GtkStateFlags state)
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{
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GtkStyleContext *button_context;
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GtkStyleContext *check_context;
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/* This information is taken from the GtkCheckButton docs, see "CSS nodes" */
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button_context = get_style (NULL, "checkbutton");
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check_context = get_style (button_context, "check");
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gtk_style_context_set_state (check_context, state);
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gtk_render_background (check_context, cr, x, y, 20, 20);
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gtk_render_frame (check_context, cr, x, y, 20, 20);
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gtk_render_check (check_context, cr, x, y, 20, 20);
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g_object_unref (check_context);
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g_object_unref (button_context);
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}
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static void
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draw_radio (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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GtkStateFlags state)
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{
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GtkStyleContext *button_context;
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GtkStyleContext *check_context;
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/* This information is taken from the GtkRadioButton docs, see "CSS nodes" */
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button_context = get_style (NULL, "radiobutton");
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check_context = get_style (button_context, "radio");
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gtk_style_context_set_state (check_context, state);
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gtk_render_background (check_context, cr, x, y, 20, 20);
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gtk_render_frame (check_context, cr, x, y, 20, 20);
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gtk_render_option (check_context, cr, x, y, 20, 20);
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g_object_unref (check_context);
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g_object_unref (button_context);
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}
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static void
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draw_progress (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
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gint height,
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gint position)
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{
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GtkStyleContext *bar_context;
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GtkStyleContext *trough_context;
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GtkStyleContext *progress_context;
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/* This information is taken from the GtkProgressBar docs, see "CSS nodes" */
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bar_context = get_style (NULL, "progressbar");
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trough_context = get_style (bar_context, "trough");
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progress_context = get_style (trough_context, "progress");
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gtk_render_background (trough_context, cr, x, y, width, height);
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gtk_render_frame (trough_context, cr, x, y, width, height);
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gtk_render_background (progress_context, cr, x, y, position, height);
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gtk_render_frame (progress_context, cr, x, y, position, height);
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g_object_unref (progress_context);
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g_object_unref (trough_context);
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g_object_unref (bar_context);
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}
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static void
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draw_combobox (GtkWidget *widget,
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cairo_t *cr,
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gint x,
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gint y,
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gint width,
|
|
gboolean has_entry)
|
|
{
|
|
GtkStyleContext *combo_context;
|
|
GtkStyleContext *button_context;
|
|
GtkStyleContext *entry_context;
|
|
GtkStyleContext *arrow_context;
|
|
|
|
/* This information is taken from the GtkComboBox docs, see "CSS nodes" */
|
|
combo_context = get_style (NULL, "combobox:focus");
|
|
button_context = get_style (combo_context, "button:focus");
|
|
entry_context = get_style (combo_context, "entry:focus");
|
|
arrow_context = get_style (button_context, "arrow");
|
|
|
|
gtk_render_background (combo_context, cr, x, y, width, 30);
|
|
gtk_render_frame (combo_context, cr, x, y, width, 30);
|
|
|
|
if (has_entry)
|
|
{
|
|
gtk_style_context_set_junction_sides (entry_context, GTK_JUNCTION_RIGHT);
|
|
gtk_render_background (entry_context, cr, x, y, width - 30, 30);
|
|
gtk_render_frame (entry_context, cr, x, y, width - 30, 30);
|
|
|
|
gtk_render_background (button_context, cr, x + width - 30, y, 30, 30);
|
|
gtk_render_frame (button_context, cr, x + width - 30, y, 30, 30);
|
|
}
|
|
else
|
|
{
|
|
gtk_render_background (button_context, cr, x, y, width, 30);
|
|
gtk_render_frame (button_context, cr, x, y, width, 30);
|
|
}
|
|
|
|
gtk_render_arrow (arrow_context, cr, G_PI / 2, x + width - 25, y+5, 20);
|
|
|
|
g_object_unref (arrow_context);
|
|
g_object_unref (entry_context);
|
|
g_object_unref (button_context);
|
|
g_object_unref (combo_context);
|
|
}
|
|
|
|
static void
|
|
draw_spinbutton (GtkWidget *widget,
|
|
cairo_t *cr,
|
|
gint x,
|
|
gint y,
|
|
gint width)
|
|
{
|
|
GtkStyleContext *spin_context;
|
|
GtkStyleContext *entry_context;
|
|
GtkStyleContext *up_context;
|
|
GtkStyleContext *down_context;
|
|
|
|
GtkIconTheme *icon_theme;
|
|
GtkIconInfo *icon_info;
|
|
GdkPixbuf *pixbuf;
|
|
|
|
/* This information is taken from the GtkSpinButton docs, see "CSS nodes" */
|
|
spin_context = get_style (NULL, "spinbutton:focus");
|
|
entry_context = get_style (NULL, "entry:focus");
|
|
up_context = get_style (spin_context, "button.up:active");
|
|
down_context = get_style (spin_context, "button.down");
|
|
|
|
gtk_render_background (entry_context, cr, x, y, width, 30);
|
|
gtk_render_frame (entry_context, cr, x, y, width, 30);
|
|
|
|
gtk_render_background (up_context, cr, x + width - 30, y, 30, 30);
|
|
gtk_render_frame (up_context, cr, x + width - 30, y, 30, 30);
|
|
|
|
gtk_render_background (down_context, cr, x + width - 60, y, 30, 30);
|
|
gtk_render_frame (down_context, cr, x + width - 60, y, 30, 30);
|
|
|
|
icon_theme = gtk_icon_theme_get_for_screen (gtk_widget_get_screen (widget));
|
|
|
|
icon_info = gtk_icon_theme_lookup_icon (icon_theme, "list-add-symbolic", 20, 0);
|
|
pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info, up_context, NULL, NULL);
|
|
g_object_unref (icon_info);
|
|
gtk_render_icon (up_context, cr, pixbuf, x + width - 30 + 5, y + 5);
|
|
g_object_unref (pixbuf);
|
|
|
|
icon_info = gtk_icon_theme_lookup_icon (icon_theme, "list-remove-symbolic", 20, 0);
|
|
pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info, down_context, NULL, NULL);
|
|
g_object_unref (icon_info);
|
|
gtk_render_icon (down_context, cr, pixbuf, x + width - 60 + 5, y + 5);
|
|
g_object_unref (pixbuf);
|
|
|
|
g_object_unref (down_context);
|
|
g_object_unref (up_context);
|
|
g_object_unref (entry_context);
|
|
g_object_unref (spin_context);
|
|
}
|
|
|
|
static gboolean
|
|
draw_cb (GtkWidget *widget,
|
|
cairo_t *cr)
|
|
{
|
|
gint panewidth, width, height;
|
|
|
|
width = gtk_widget_get_allocated_width (widget);
|
|
panewidth = width / 2;
|
|
height = gtk_widget_get_allocated_height (widget);
|
|
|
|
cairo_rectangle (cr, 0, 0, width, height);
|
|
cairo_set_source_rgb (cr, 0.6, 0.6, 0.6);
|
|
cairo_fill (cr);
|
|
|
|
draw_horizontal_scrollbar (widget, cr, 10, 10, panewidth - 20, 12, 30, GTK_STATE_FLAG_NORMAL);
|
|
draw_horizontal_scrollbar (widget, cr, 10, 30, panewidth - 20, 12, 40, GTK_STATE_FLAG_PRELIGHT);
|
|
draw_horizontal_scrollbar (widget, cr, 10, 50, panewidth - 20, 12, 50, GTK_STATE_FLAG_ACTIVE|GTK_STATE_FLAG_PRELIGHT);
|
|
|
|
draw_text (widget, cr, 10, 70, panewidth - 20, 20, "Not selected", GTK_STATE_FLAG_NORMAL);
|
|
draw_text (widget, cr, 10, 100, panewidth - 20, 20, "Selected", GTK_STATE_FLAG_SELECTED);
|
|
|
|
draw_check (widget, cr, 10, 130, GTK_STATE_FLAG_NORMAL);
|
|
draw_check (widget, cr, 40, 130, GTK_STATE_FLAG_CHECKED);
|
|
draw_radio (widget, cr, 70, 130, GTK_STATE_FLAG_NORMAL);
|
|
draw_radio (widget, cr, 100, 130, GTK_STATE_FLAG_CHECKED);
|
|
draw_progress (widget, cr, 10, 160, panewidth - 20, 6, 50);
|
|
|
|
draw_menu (widget, cr, 10 + panewidth, 10, panewidth - 20, 90);
|
|
|
|
draw_menubar (widget, cr, 10 + panewidth, 110, panewidth - 20, 20);
|
|
|
|
draw_spinbutton (widget, cr, 10 + panewidth, 140, panewidth - 20);
|
|
|
|
draw_notebook (widget, cr, 10, 200, panewidth - 20, 160);
|
|
|
|
draw_combobox (widget, cr, 10 + panewidth, 200, panewidth - 20, FALSE);
|
|
|
|
draw_combobox (widget, cr, 10 + panewidth, 240, panewidth - 20, TRUE);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
GtkWidget *
|
|
do_foreigndrawing (GtkWidget *do_widget)
|
|
{
|
|
static GtkWidget *window = NULL;
|
|
|
|
if (!window)
|
|
{
|
|
GtkWidget *box;
|
|
GtkWidget *da;
|
|
|
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
gtk_window_set_title (GTK_WINDOW (window), "Foreign drawing");
|
|
gtk_window_set_screen (GTK_WINDOW (window),
|
|
gtk_widget_get_screen (do_widget));
|
|
g_signal_connect (window, "destroy",
|
|
G_CALLBACK (gtk_widget_destroyed), &window);
|
|
|
|
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
|
|
gtk_container_add (GTK_CONTAINER (window), box);
|
|
da = gtk_drawing_area_new ();
|
|
gtk_widget_set_size_request (da, 400, 400);
|
|
gtk_widget_set_hexpand (da, TRUE);
|
|
gtk_widget_set_vexpand (da, TRUE);
|
|
gtk_widget_set_app_paintable (da, TRUE);
|
|
gtk_container_add (GTK_CONTAINER (box), da);
|
|
|
|
g_signal_connect (da, "draw", G_CALLBACK (draw_cb), NULL);
|
|
}
|
|
|
|
if (!gtk_widget_get_visible (window))
|
|
gtk_widget_show_all (window);
|
|
else
|
|
gtk_widget_destroy (window);
|
|
|
|
return window;
|
|
}
|