screen.h

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/**************************************************************************************************************************************
* Project:       discoverpixy
* Website:       https://github.com/t-moe/discoverpixy
* Authors:       Aaron Schmocker, Timo Lang
* Institution:   BFH Bern University of Applied Sciences
* File:          common/gui/screen.h
*
* Version History:
* Date          Autor Email         SHA     Changes
* 2015-04-27    timolang@gmail.com  cf72baa Introduced a Screen (sub) module and divided app into multiple screens.
* 2015-04-27    timolang@gmail.com  77e6d0e Fixed screen implementation.
* 2015-05-11    timolang@gmail.com  08d9fe0 More work on doxygen module structure
* 2015-05-15    timolang@gmail.com  9a16865 Added doxgen comments to filesyste, checkbox, numupdown and screen module. And some minor changes to the other modules.
* 2015-05-17    timolang@gmail.com  2d46336 Improved comments in implementation of button, checkbox, numupdown, tft, touch and screen modules/submodules.
* 2015-06-06    timolang@gmail.com  c06661d Fixed some outdated comments in source code. Documented Gui Module in docu.
*
**************************************************************************************************************************************/

#ifndef SCREEN_H
#define SCREEN_H

#include <stdio.h>
#include <stdbool.h>




typedef void (*SCREEN_CALLBACK)(void* screen);

typedef struct SCREEN_S {
    SCREEN_CALLBACK on_enter; 
    SCREEN_CALLBACK on_leave; 
    SCREEN_CALLBACK on_update; 

    struct SCREEN_S* next; 
} SCREEN_STRUCT;



bool gui_screen_navigate(SCREEN_STRUCT* screen);

bool gui_screen_back();


SCREEN_STRUCT* gui_screen_get_current();

//Updates/switches the screens. Call this from the app main loop, as fast as you can.
void gui_screen_update();

#endif /* SCREEN_H */