1 files changed, 61 insertions, 0 deletions
diff --git a/src/math-buttons.c b/src/math-buttons.c
index 50b15a7..22d8570 100644
--- a/src/math-buttons.c
+++ b/src/math-buttons.c
@@ -45,6 +45,7 @@ struct MathButtonsPrivate
 GtkWidget *shift_left_menu, *shift_right_menu;
 
 GtkWidget *function_menu;
+ GtkWidget *const_menu;
 
 GList *superscript_toggles;
 GList *subscript_toggles;
@@ -125,6 +126,9 @@ static ButtonData button_data[] = {
 {"function", NULL, FUNCTION,
 /* Tooltip for the additional functions button */
 N_("Additional Functions")},
+ {"const", NULL, FUNCTION,
+ /* Tooltip for the additional constant button */
+ N_("Additional constants")},
 {"x_pow_y", "^", FUNCTION,
 /* Tooltip for the exponent button */
 N_("Exponent [^ or **]")},
@@ -1021,6 +1025,63 @@ function_cb(GtkWidget *widget, MathButtons *buttons)
 popup_button_menu(widget, GTK_MENU(buttons->priv->function_menu)); 
 }
 
+static void
+insert_const_cb(GtkWidget *widget, MathButtons *buttons)
+{
+ math_equation_insert(buttons->priv->equation, g_object_get_data(G_OBJECT(widget), "const"));
+}
+
+
+void const_cb(GtkWidget *widget, MathButtons *buttons);
+G_MODULE_EXPORT
+void
+const_cb(GtkWidget *widget, MathButtons *buttons)
+{
+ if (!buttons->priv->const_menu) {
+ gint i;
+ GtkWidget *menu;
+ struct 
+ {
+ gchar *name, *constant;
+ } constants[] = 
+ {
+ { /* Tooltip for the c₀ component button */
+ N_("Velocity of Light"), "c₀" },
+ { /* Tooltip for the μ₀ component button */
+ N_("Magnetic constant"), "μ₀" },
+ { /* Tooltip for the ε₀ button */
+ N_("Electric constant"), "ε₀" },
+ { /* Tooltip for the G button */
+ N_("Newtonian constant of gravitation"), "G" },
+ { /* Tooltip for the h button */
+ N_("Planck constant"), "h" },
+ { /* Tooltip for the ｅ button */
+ N_("Elementary charge"), "ｅ" },
+ { /* Tooltip for the mₑ button */
+ N_("Electron mass"), "mₑ" },
+ { /* Tooltip for the mₚ button */
+ N_("Proton mass"), "mₚ" },
+ { /* Tooltip for the Nₐ button */
+ N_("Avogrado constant"), "Nₐ" },
+ { NULL, NULL }
+ };
+
+ menu = buttons->priv->const_menu = gtk_menu_new();
+ gtk_menu_set_reserve_toggle_size(GTK_MENU(menu), FALSE);
+
+ for (i = 0; constants[i].name != NULL; i++) {
+ GtkWidget *item;
+ 
+ item = gtk_menu_item_new_with_label(_(constants[i].name));
+ g_object_set_data(G_OBJECT(item), "const", g_strdup(constants[i].constant));
+ gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
+ g_signal_connect(item, "activate", G_CALLBACK(insert_const_cb), buttons);
+ gtk_widget_show(item);
+ }
+ }
+
+ popup_button_menu(widget, GTK_MENU(buttons->priv->const_menu)); 
+}
 
 void factorize_cb(GtkWidget *widget, MathButtons *buttons);
 G_MODULE_EXPORT