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150 lines
4.1 KiB
150 lines
4.1 KiB
/*
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u8g2_input_value.c
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2016, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "u8g2.h"
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/*
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return:
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0: value is not changed (HOME/Break Button pressed)
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1: value has been updated
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*/
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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)
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{
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uint8_t line_height;
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uint8_t height;
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u8g2_uint_t pixel_height;
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u8g2_uint_t y, yy;
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u8g2_uint_t pixel_width;
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u8g2_uint_t x, xx;
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uint8_t local_value = *value;
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//uint8_t r; /* not used ??? */
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uint8_t event;
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/* only horizontal strings are supported, so force this here */
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u8g2_SetFontDirection(u8g2, 0);
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/* force baseline position */
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u8g2_SetFontPosBaseline(u8g2);
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/* calculate line height */
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line_height = u8g2_GetAscent(u8g2);
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line_height -= u8g2_GetDescent(u8g2);
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/* calculate overall height of the input value box */
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height = 1; /* value input line */
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height += u8x8_GetStringLineCnt(title);
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/* calculate the height in pixel */
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pixel_height = height;
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pixel_height *= line_height;
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/* calculate offset from top */
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y = 0;
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if ( pixel_height < u8g2_GetDisplayHeight(u8g2) )
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{
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y = u8g2_GetDisplayHeight(u8g2);
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y -= pixel_height;
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y /= 2;
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}
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/* calculate offset from left for the label */
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x = 0;
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pixel_width = u8g2_GetUTF8Width(u8g2, pre);
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pixel_width += u8g2_GetUTF8Width(u8g2, "0") * digits;
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pixel_width += u8g2_GetUTF8Width(u8g2, post);
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if ( pixel_width < u8g2_GetDisplayWidth(u8g2) )
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{
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x = u8g2_GetDisplayWidth(u8g2);
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x -= pixel_width;
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x /= 2;
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}
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/* event loop */
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for(;;)
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{
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u8g2_FirstPage(u8g2);
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do
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{
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/* render */
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yy = y;
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yy += u8g2_DrawUTF8Lines(u8g2, 0, yy, u8g2_GetDisplayWidth(u8g2), line_height, title);
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xx = x;
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xx += u8g2_DrawUTF8(u8g2, xx, yy, pre);
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xx += u8g2_DrawUTF8(u8g2, xx, yy, u8x8_u8toa(local_value, digits));
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u8g2_DrawUTF8(u8g2, xx, yy, post);
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} while( u8g2_NextPage(u8g2) );
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#ifdef U8G2_REF_MAN_PIC
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return 0;
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#endif
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for(;;)
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{
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event = u8x8_GetMenuEvent(u8g2_GetU8x8(u8g2));
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if ( event == U8X8_MSG_GPIO_MENU_SELECT )
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{
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*value = local_value;
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return 1;
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}
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else if ( event == U8X8_MSG_GPIO_MENU_HOME )
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{
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return 0;
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}
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else if ( event == U8X8_MSG_GPIO_MENU_NEXT || event == U8X8_MSG_GPIO_MENU_UP )
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{
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if ( local_value >= hi )
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local_value = lo;
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else
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local_value++;
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break;
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}
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else if ( event == U8X8_MSG_GPIO_MENU_PREV || event == U8X8_MSG_GPIO_MENU_DOWN )
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{
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if ( local_value <= lo )
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local_value = hi;
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else
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local_value--;
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break;
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}
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}
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}
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/* never reached */
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//return r;
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}
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