Exit button in Scrollable Jump Table (static)

[JosehL7]

Hello, I'm starting my studies with the library and I saw the example of a scrollable jump table (static) as below:

MUI_FORM(1)
MUI_STYLE(0)
MUI_DATA("GP", 
    MUI_10 "Goto Buttons|"
    MUI_20 "uint8 Number|"
    MUI_30 "uint8 Checkbox|"
    MUI_40 "uint8 Cycle Options|"
    MUI_50 "uint8 ParentChild Select|"
    MUI_60 "uint8 Char/Text Input|"
    MUI_70 "uint16 Cycle Options|"
    MUI_80 "uint16 ParentChild Select")
MUI_XYA("GC", 5, 25, 0) 
MUI_XYA("GC", 5, 37, 1) 
MUI_XYA("GC", 5, 49, 2) 
MUI_XYA("GC", 5, 61, 3) 

From what I understood, when I select each of these fields I can go to another form. I would like to know if one of the items in this list could actually be a back button so I could exit the menu. I tried using the "Exit button" but it remains static on the display and I would actually like it to be just another item in the list.

I appreciate any help in advance.

[olikraus]

Let me assume you use uint8_t mui_u8g2_goto_form_w1_pi(mui_t *ui, uint8_t msg), then we could create a new muif function based on uint8_t mui_u8g2_goto_form_w1_pi(mui_t *ui, uint8_t msg):

uint8_t mui_goto_or_back_form_w1_pi(mui_t *ui, uint8_t msg)
{
  if ( msg == MUIF_MSG_CURSOR_SELECT )
  {
    if ( mui_GetSelectableFieldTextOption(ui, ui->last_form_fds, ui->arg + ui->form_scroll_top) )
    {
      if ( (uint8_t)ui->text[0] == 255 ) // use MUI_255 for the return
      {
         return mui_RestoreForm(ui);
      }
    }
  }
  return mui_u8g2_goto_form_w1_pi(ui,  msg);  // call the original MUIF
}

In this case, the jump back functionality is then executed with MUI_255.
Not tested...

[JosehL7]

Hello Olikraus

I tested the code you sent, but it was showing an error because the "mui_RestoreForm(ui);" function is of the "void" type and I can't return it in the "mui_goto_or_back_form_w1_pi" function. I studied how you implemented the "exit button" and saw that you have the "mui_LeaveForm(ui);" function, so I used it to do what you proposed and I was successful. See the full code:

uint8_t mui_goto_or_back_form_w1_pi(mui_t *ui, uint8_t msg)
{
  if ( msg == MUIF_MSG_CURSOR_SELECT )
  {
    if ( mui_GetSelectableFieldTextOption(ui, ui->last_form_fds, ui->arg + ui->form_scroll_top) )
    {
      if ( (uint8_t)ui->text[0] == 254 ) // use MUI_255 for the return
      {
        mui_LeaveForm(ui);
        return 1;
      }
    }
  }
  return mui_u8g2_goto_form_w1_pi(ui,  msg);  // call the original MUIF
}

Another point: I tried to use "MUI_255", but when I use it, a problem occurs that when the display shows all the items in the list, they don't appear and I can't even interact with it.

As I said before, I'm still starting to study the library, so please comment if I've implemented something wrong or incorrectly. I thank you in advance for your help.

[olikraus]

You are right, 255 has a special meaning, we need to use 254 (or any other number between 1 and 254). mui_LeaveForm will not work, but yes, mui_RestoreForm(ui); is void.

The correct code is here:

u8g2/sys/sdl/mui_all/main.c

Lines 213 to 229 in e6a66ee

	/* https://github.com/olikraus/u8g2/discussions/2516 */
	uint8_t mui_goto_or_back_form_w1_pi(mui_t *ui, uint8_t msg)
	{
	if ( msg == MUIF_MSG_CURSOR_SELECT )
	{
	if ( mui_GetSelectableFieldTextOption(ui, ui->last_form_fds, ui->arg + ui->form_scroll_top) )
	{
	if ( (uint8_t)ui->text[0] == 254 ) // use MUI_254 for the return
	{
	mui_RestoreForm(ui);
	return 0;
	}
	}
	}
	return mui_u8g2_goto_form_w1_pi(ui, msg); // call the original MUIF
	}

The muif table entry is here:

u8g2/sys/sdl/mui_all/main.c

Line 305 in e6a66ee

MUIF_BUTTON("GC", mui_goto_or_back_form_w1_pi), /* mui_u8g2_goto_form_w1_pi replaced by mui_goto_or_back_form_w1_pi */

and finally the menu is here:

u8g2/sys/sdl/mui_all/main.c

Lines 439 to 455 in e6a66ee

	MUI_FORM(20)
	MUI_STYLE(1)
	MUI_LABEL(5,10, "uint8 Number")
	MUI_XY("HR", 0,13)
	MUI_STYLE(0)
	MUI_DATA("GP",
	MUI_21 "u8_min_max_wm_mse_pi|"
	MUI_21 "u8_min_max_wm_mse_pi 2|"
	MUI_22 "u8_min_max_wm_mud_pi|"
	MUI_23 "u8_min_max_wm_mse_pf|"
	MUI_24 "u8_min_max_wm_mud_pf|"
	MUI_254 "2nd Back to Main Menu|"
	MUI_1 "Back to Main Menu" )
	MUI_XYA("GC", 5, 25, 0)
	MUI_XYA("GC", 5, 37, 1)
	MUI_XYA("GC", 5, 49, 2)
	MUI_XYA("GC", 5, 61, 3)

[JosehL7]

Hi Olikraus,

Thank you very much for your help.