Add increment and decrement controls for numeric display options

Signed-off-by: Ahmed Abouzied <email@aabouzied.com>

Author: ahmedaabouzied

DisplayOptionsPanel.c

@@ -20,7 +20,9 @@ in the source distribution for its full text.
 #include "ProvideCurses.h"
 
 
-static const char* const DisplayOptionsFunctions[] = {"      ", "      ", "      ", "      ", "      ", "      ", "      ", "      ", "      ", "Done  ", NULL};
+static const char* const DisplayOptionsFunctions[] = {"Select / Deselect  ","Increment  ", "Decrement  ", "Done  ", NULL};
+static const char* const DisplayOptionsKeys[] = {"Enter","+", "-", "F10", "Esc"};
+static const int DisplayOptionsEvents[] = {KEY_ENTER, '+', '-', KEY_F(10), 27};
 
 static void DisplayOptionsPanel_delete(Object* object) {
    Panel* super = (Panel*) object;
@@ -90,7 +92,7 @@ const PanelClass DisplayOptionsPanel_class = {
 DisplayOptionsPanel* DisplayOptionsPanel_new(Settings* settings, ScreenManager* scr) {
    DisplayOptionsPanel* this = AllocThis(DisplayOptionsPanel);
    Panel* super = (Panel*) this;
-   FunctionBar* fuBar = FunctionBar_new(DisplayOptionsFunctions, NULL, NULL);
+   FunctionBar* fuBar = FunctionBar_new(DisplayOptionsFunctions, DisplayOptionsKeys, DisplayOptionsEvents);
    Panel_init(super, 1, 1, 1, 1, Class(OptionItem), true, fuBar);
 
    this->settings = settings;