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evrooig/lib/u8g2/clib/u8x8_input_value.c

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/*
u8x8_input_value.c
Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
Copyright (c) 2016, olikraus@gmail.com
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or other
materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "u8x8.h"
/*
return:
0: value is not changed (HOME/Break Button pressed)
1: value has been updated
*/
uint8_t u8x8_UserInterfaceInputValue(u8x8_t *u8x8, const char *title, const char *pre, uint8_t *value, uint8_t lo, uint8_t hi, uint8_t digits, const char *post)
{
uint8_t height;
uint8_t y;
uint8_t width;
uint8_t x;
uint8_t local_value = *value;
uint8_t r;
uint8_t event;
/* calculate overall height of the input value box */
height = 1; /* button line */
height += u8x8_GetStringLineCnt(title);
/* calculate offset from top */
y = 0;
if ( height < u8x8_GetRows(u8x8) )
{
y = u8x8_GetRows(u8x8);
y -= height;
y /= 2;
}
/* calculate offset from left for the label */
x = 0;
width = u8x8_GetUTF8Len(u8x8, pre);
width += digits;
width += u8x8_GetUTF8Len(u8x8, post);
if ( width < u8x8_GetCols(u8x8) )
{
x = u8x8_GetCols(u8x8);
x -= width;
x /= 2;
}
/* render */
u8x8_ClearDisplay(u8x8); /* required, because not everything is filled */
u8x8_SetInverseFont(u8x8, 0);
y += u8x8_DrawUTF8Lines(u8x8, 0, y, u8x8_GetCols(u8x8), title);
x += u8x8_DrawUTF8(u8x8, x, y, pre);
u8x8_DrawUTF8(u8x8, x+digits, y, post);
u8x8_SetInverseFont(u8x8, 1);
/* event loop */
u8x8_DrawUTF8(u8x8, x, y, u8x8_u8toa(local_value, digits));
for(;;)
{
event = u8x8_GetMenuEvent(u8x8);
if ( event == U8X8_MSG_GPIO_MENU_SELECT )
{
*value = local_value;
r = 1;
break;
}
else if ( event == U8X8_MSG_GPIO_MENU_HOME )
{
r = 0;
break;
}
else if ( event == U8X8_MSG_GPIO_MENU_NEXT || event == U8X8_MSG_GPIO_MENU_UP )
{
if ( local_value >= hi )
local_value = lo;
else
local_value++;
u8x8_DrawUTF8(u8x8, x, y, u8x8_u8toa(local_value, digits));
}
else if ( event == U8X8_MSG_GPIO_MENU_PREV || event == U8X8_MSG_GPIO_MENU_DOWN )
{
if ( local_value <= lo )
local_value = hi;
else
local_value--;
u8x8_DrawUTF8(u8x8, x, y, u8x8_u8toa(local_value, digits));
}
}
u8x8_SetInverseFont(u8x8, 0);
return r;
}