numupdown.c File Reference

#include "tft.h"
#include "touch.h"
#include "button.h"
#include "numupdown.h"
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>

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Macros
#define	BASE_COLOR   RGB(90,90,90)

Functions
void	button_up_cb (void *button)
void	button_down_cb (void *button)
static uint8_t	calc_text_width (int16_t val)
bool	gui_numupdown_add (NUMUPDOWN_STRUCT *numupdown)
void	gui_numupdown_remove (NUMUPDOWN_STRUCT *numupdown)
void	gui_numupdown_redraw (NUMUPDOWN_STRUCT *numupdown)
void	gui_numupdown_update (NUMUPDOWN_STRUCT *numupdown)

Macro Definition Documentation

#define BASE_COLOR   RGB(90,90,90)

Definition at line 31 of file numupdown.c.

Function Documentation

void button_down_cb

(

void *

button

)

Definition at line 50 of file numupdown.c.

{
    //Get the pointer to the numupdown: subtract the offset of the buttonDown member in the struct from the button pointer
    NUMUPDOWN_STRUCT* element = button - offsetof(NUMUPDOWN_STRUCT, buttonDown);

    if (element->value > element->min) { //old value lies above the minimum
        element->value--; //let's decrease the value
        gui_numupdown_update(element); //and redraw everything

        if (element->callback != NULL) { //the user provided a callback
            element->callback(element, element->value); //Call the user callback with the new value
        }
    }
}

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void button_up_cb

(

void *

button

)

Definition at line 34 of file numupdown.c.

{
    //Get the pointer to the numupdown: subtract the offset of the buttonUp member in the struct from the button pointer
    NUMUPDOWN_STRUCT* element = button - offsetof(NUMUPDOWN_STRUCT, buttonUp);

    if (element->value < element->max) { //old value lies below the maximum
        element->value++; //let's increase the value
        gui_numupdown_update(element); //and redraw everything

        if (element->callback != NULL) { //the user provided a callback
            element->callback(element, element->value); //Call the user callback with the new value
        }
    }
}

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static uint8_t calc_text_width ( int16_t  val )

static

Definition at line 66 of file numupdown.c.

{
    uint8_t width = 1 + (val < 0); //1 if positive, 2 if negative (to let space for sign)
    val = abs(val); //Make the number positive

    while (val >= 10) { //while we have two or more digits
        val /= 10; //remove one digit
        width++; //add one character
    }

    return width;
}

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