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comparison: components/u8g2/csrc/u8x8_selection_list.c

components/u8g2/csrc/u8x8_selection_list.c

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1 /*
2
3 u8x8_selection_list.c
4
5 selection list with scroll option
6
7 Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
8
9 Copyright (c) 2016, olikraus@gmail.com
10 All rights reserved.
11
12 Redistribution and use in source and binary forms, with or without modification,
13 are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice, this list
16 of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright notice, this
19 list of conditions and the following disclaimer in the documentation and/or other
20 materials provided with the distribution.
21
22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
23 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
24 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
27 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
31 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
32 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35
36 */
37
38 #include "u8x8.h"
39
40 /*
41 increase the cursor position
42 */
43 void u8sl_Next(u8sl_t *u8sl)
44 {
45 u8sl->current_pos++;
46 if ( u8sl->current_pos >= u8sl->total )
47 {
48 u8sl->current_pos = 0;
49 u8sl->first_pos = 0;
50 }
51 else
52 {
53 if ( u8sl->first_pos + u8sl->visible <= u8sl->current_pos + 1 )
54 {
55 u8sl->first_pos = u8sl->current_pos - u8sl->visible + 1;
56 }
57 }
58 }
59
60 void u8sl_Prev(u8sl_t *u8sl)
61 {
62 if ( u8sl->current_pos == 0 )
63 {
64 u8sl->current_pos = u8sl->total - 1;
65 u8sl->first_pos = 0;
66 if ( u8sl->total > u8sl->visible )
67 u8sl->first_pos = u8sl->total - u8sl->visible;
68 }
69 else
70 {
71 u8sl->current_pos--;
72 if ( u8sl->first_pos > u8sl->current_pos )
73 u8sl->first_pos = u8sl->current_pos;
74 }
75 }
76
77 void u8x8_DrawSelectionList(u8x8_t *u8x8, u8sl_t *u8sl, u8x8_sl_cb sl_cb, const void *aux)
78 {
79 uint8_t i;
80 for( i = 0; i < u8sl->visible; i++ )
81 {
82 sl_cb(u8x8, u8sl, i+u8sl->first_pos, aux);
83 }
84 }
85
86 /* selection list with string line */
87 void u8x8_sl_string_line_cb(u8x8_t *u8x8, u8sl_t *u8sl, uint8_t idx, const void *aux)
88 {
89 const char *s;
90 uint8_t row;
91 /* calculate offset from display upper border */
92 row = u8sl->y;
93
94 /* calculate target pos */
95 row += idx;
96 row -= u8sl->first_pos;
97
98 /* check whether this is the current cursor line */
99 if ( idx == u8sl->current_pos )
100 u8x8_SetInverseFont(u8x8, 1);
101 else
102 u8x8_SetInverseFont(u8x8, 0);
103
104 /* get the line from the array */
105 s = u8x8_GetStringLineStart(idx, (const char *)aux);
106
107 /* draw the line */
108 if ( s == NULL )
109 s = "";
110 u8x8_DrawUTF8Line(u8x8, u8sl->x, row, u8x8_GetCols(u8x8), s);
111 u8x8_SetInverseFont(u8x8, 0);
112 }
113
114 /*
115 title: NULL for no title, valid str for title line. Can contain mutliple lines, separated by '\n'
116 start_pos: default position for the cursor (starts with 1)
117 sl: string list (list of strings separated by \n)
118 returns 0 if user has pressed the home key
119 returns the selected line+1 if user has pressed the select key (e.g. 1 for the first line)
120 */
121 uint8_t u8x8_UserInterfaceSelectionList(u8x8_t *u8x8, const char *title, uint8_t start_pos, const char *sl)
122 {
123 u8sl_t u8sl;
124 uint8_t event;
125 uint8_t title_lines;
126
127 if ( start_pos > 0 )
128 start_pos--;
129
130 u8sl.visible = u8x8_GetRows(u8x8);
131 u8sl.total = u8x8_GetStringLineCnt(sl);
132 u8sl.first_pos = 0;
133 u8sl.current_pos = start_pos;
134 u8sl.x = 0;
135 u8sl.y = 0;
136
137
138 //u8x8_ClearDisplay(u8x8); /* not required because all is 100% filled */
139 u8x8_SetInverseFont(u8x8, 0);
140
141 if ( title != NULL )
142 {
143 title_lines = u8x8_DrawUTF8Lines(u8x8, u8sl.x, u8sl.y, u8x8_GetCols(u8x8), title);
144 u8sl.y+=title_lines;
145 u8sl.visible-=title_lines;
146 }
147
148 if ( u8sl.current_pos >= u8sl.total )
149 u8sl.current_pos = u8sl.total-1;
150
151
152 u8x8_DrawSelectionList(u8x8, &u8sl, u8x8_sl_string_line_cb, sl);
153
154 for(;;)
155 {
156 event = u8x8_GetMenuEvent(u8x8);
157 if ( event == U8X8_MSG_GPIO_MENU_SELECT )
158 return u8sl.current_pos+1;
159 else if ( event == U8X8_MSG_GPIO_MENU_HOME )
160 return 0;
161 else if ( event == U8X8_MSG_GPIO_MENU_NEXT || event == U8X8_MSG_GPIO_MENU_DOWN )
162 {
163 u8sl_Next(&u8sl);
164 u8x8_DrawSelectionList(u8x8, &u8sl, u8x8_sl_string_line_cb, sl);
165 }
166 else if ( event == U8X8_MSG_GPIO_MENU_PREV || event == U8X8_MSG_GPIO_MENU_UP )
167 {
168 u8sl_Prev(&u8sl);
169 u8x8_DrawSelectionList(u8x8, &u8sl, u8x8_sl_string_line_cb, sl);
170 }
171 }
172 }
173

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