Implement switching edited character

main.py

@@ -39,6 +39,7 @@ def draw_editor_canvas():
     global project_char_res
     global canvas_width
     global canvas_height
+
     canvas_editor.delete("all")
 
     # draw grid
@@ -96,9 +97,32 @@ def menu_file_save_project_click():
 def menu_file_save_project_as_click():
     pass
 
+def button_prev_glyph_click():
+    global current_char
+    current_char-=1
+    keep_char_num_in_bounds()
+    draw_editor_canvas()
+
+
+def button_next_glyph_click():
+    global current_char
+    current_char+=1
+    keep_char_num_in_bounds()
+    draw_editor_canvas()
+
+
+def keep_char_num_in_bounds():
+    global current_char
+    if current_char<0:
+        current_char=0
+    elif current_char>99999:
+        current_char=99999
+
+
 def number_only_validate(val):
     return str.isdigit(val) or val==""
 
+
 window=tkinter.Tk()
 window.title("fonteditor")
 window.geometry(f"{WINDOW_SIZE[0]}x{WINDOW_SIZE[1]}")
@@ -125,10 +149,10 @@ label_glyph_name.pack(side="top")
 frame_nav=tkinter.Frame(frame_controls)
 frame_nav.pack(side="top",pady=10)
 
-button_prev_glyph=tkinter.Button(frame_nav,width=10,text="Previous")
+button_prev_glyph=tkinter.Button(frame_nav,width=10,text="Previous",command=button_prev_glyph_click)
 button_prev_glyph.pack(side="left")
 
-button_next_glyph=tkinter.Button(frame_nav,width=10,text="Next")
+button_next_glyph=tkinter.Button(frame_nav,width=10,text="Next",command=button_next_glyph_click)
 button_next_glyph.pack(side="left")
 
 frame_glyph_id=tkinter.Frame(frame_controls)
@@ -156,15 +180,6 @@ def cursor_pos_to_pixel(pos):
     return pixel_pos
 
 
-
-#d_time = 1 / fps_limit
-
-is_grid = True
-
-does_char_exist = check_char_exist(char_num)
-
-force_deleted = False
-
 # main loop
 while True:
     for event in pygame.event.get():
@@ -175,11 +190,6 @@ while True:
         elif event.type == pygame.MOUSEWHEEL:
             char_num += event.y * -1
 
-            if char_num < 0:
-                char_num = 0
-            elif char_num > 99999:
-                char_num = 99999
-
             does_char_exist = check_char_exist(char_num)