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- /*
- u8g2_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 "u8g2.h"
- /*
- return:
- 0: value is not changed (HOME/Break Button pressed)
- 1: value has been updated
- */
- uint8_t u8g2_UserInterfaceInputValue(u8g2_t *u8g2, const char *title, const char *pre, uint8_t *value, uint8_t lo, uint8_t hi, uint8_t digits, const char *post)
- {
- uint8_t line_height;
- uint8_t height;
- u8g2_uint_t pixel_height;
- u8g2_uint_t y, yy;
- u8g2_uint_t pixel_width;
- u8g2_uint_t x, xx;
-
- uint8_t local_value = *value;
- //uint8_t r; /* not used ??? */
- uint8_t event;
- /* only horizontal strings are supported, so force this here */
- u8g2_SetFontDirection(u8g2, 0);
- /* force baseline position */
- u8g2_SetFontPosBaseline(u8g2);
-
- /* calculate line height */
- line_height = u8g2_GetAscent(u8g2);
- line_height -= u8g2_GetDescent(u8g2);
-
-
- /* calculate overall height of the input value box */
- height = 1; /* value input line */
- height += u8x8_GetStringLineCnt(title);
- /* calculate the height in pixel */
- pixel_height = height;
- pixel_height *= line_height;
- /* calculate offset from top */
- y = 0;
- if ( pixel_height < u8g2_GetDisplayHeight(u8g2) )
- {
- y = u8g2_GetDisplayHeight(u8g2);
- y -= pixel_height;
- y /= 2;
- }
-
- /* calculate offset from left for the label */
- x = 0;
- pixel_width = u8g2_GetUTF8Width(u8g2, pre);
- pixel_width += u8g2_GetUTF8Width(u8g2, "0") * digits;
- pixel_width += u8g2_GetUTF8Width(u8g2, post);
- if ( pixel_width < u8g2_GetDisplayWidth(u8g2) )
- {
- x = u8g2_GetDisplayWidth(u8g2);
- x -= pixel_width;
- x /= 2;
- }
-
- /* event loop */
- for(;;)
- {
- u8g2_FirstPage(u8g2);
- do
- {
- /* render */
- yy = y;
- yy += u8g2_DrawUTF8Lines(u8g2, 0, yy, u8g2_GetDisplayWidth(u8g2), line_height, title);
- xx = x;
- xx += u8g2_DrawUTF8(u8g2, xx, yy, pre);
- xx += u8g2_DrawUTF8(u8g2, xx, yy, u8x8_u8toa(local_value, digits));
- u8g2_DrawUTF8(u8g2, xx, yy, post);
- } while( u8g2_NextPage(u8g2) );
-
- #ifdef U8G2_REF_MAN_PIC
- return 0;
- #endif
-
- for(;;)
- {
- event = u8x8_GetMenuEvent(u8g2_GetU8x8(u8g2));
- if ( event == U8X8_MSG_GPIO_MENU_SELECT )
- {
- *value = local_value;
- return 1;
- }
- else if ( event == U8X8_MSG_GPIO_MENU_HOME )
- {
- return 0;
- }
- else if ( event == U8X8_MSG_GPIO_MENU_NEXT || event == U8X8_MSG_GPIO_MENU_UP )
- {
- if ( local_value >= hi )
- local_value = lo;
- else
- local_value++;
- break;
- }
- else if ( event == U8X8_MSG_GPIO_MENU_PREV || event == U8X8_MSG_GPIO_MENU_DOWN )
- {
- if ( local_value <= lo )
- local_value = hi;
- else
- local_value--;
- break;
- }
- }
- }
-
- /* never reached */
- //return r;
- }
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