1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** GUIX Component */
17 /** */
18 /** Text Input Management (Single Line Text Input) */
19 /** */
20 /**************************************************************************/
21
22 #define GX_SOURCE_CODE
23
24
25 /* Include necessary system files. */
26
27 #include "gx_api.h"
28 #include "gx_context.h"
29 #include "gx_system.h"
30 #include "gx_widget.h"
31 #include "gx_single_line_text_input.h"
32 #include "gx_utility.h"
33
34 /**************************************************************************/
35 /* */
36 /* FUNCTION RELEASE */
37 /* */
38 /* _gx_single_line_text_input_position_get PORTABLE C */
39 /* 6.1 */
40 /* AUTHOR */
41 /* */
42 /* Kenneth Maxwell, Microsoft Corporation */
43 /* */
44 /* DESCRIPTION */
45 /* */
46 /* This service positions the text input cursor based on the requested */
47 /* cursor position. The text input cursor index will be calculated */
48 /* based on the x value of the pixel pisition. */
49 /* */
50 /* INPUT */
51 /* */
52 /* text_input Single-line text input */
53 /* widget control block */
54 /* pixel_position X value of pixel position */
55 /* */
56 /* OUTPUT */
57 /* */
58 /* Status Completion status */
59 /* */
60 /* CALLS */
61 /* */
62 /* _gx_widget_font_get Get widget font */
63 /* _gx_widget_border_width_get Get the widget border width */
64 /* _gx_widget_client_get Get client rectangle */
65 /* _gx_utility_utf8_string_character_get Parse utf8 string to */
66 /* multi-byte glyph */
67 /* _gx_system_string_width_get Get the width of a string */
68 /* _gx_system_dirty_mark Mark a widget area dirty */
69 /* _gx_system_dirty_partial_add Mark the partial area of a */
70 /* widget as dirty */
71 /* */
72 /* CALLED BY */
73 /* */
74 /* Application Code */
75 /* GUIX Internal Code */
76 /* */
77 /* RELEASE HISTORY */
78 /* */
79 /* DATE NAME DESCRIPTION */
80 /* */
81 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
82 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
83 /* resulting in version 6.1 */
84 /* */
85 /**************************************************************************/
_gx_single_line_text_input_position_get(GX_SINGLE_LINE_TEXT_INPUT * text_input,INT pixel_position)86 UINT _gx_single_line_text_input_position_get(GX_SINGLE_LINE_TEXT_INPUT *text_input, INT pixel_position)
87 {
88 GX_TEXT_INPUT_CURSOR *cursor_ptr;
89 GX_CHAR *string_buffer;
90 GX_FONT *gx_font;
91 GX_RECTANGLE client;
92 GX_VALUE width;
93 GX_VALUE cursor_pos;
94 GX_VALUE x_pos;
95 GX_VALUE distance;
96 UINT new_insert_pos;
97 UINT index;
98 UINT glyph_len = 1;
99 GX_STRING utf8_string;
100 GX_STRING string;
101
102 string.gx_string_ptr = text_input -> gx_single_line_text_input_buffer;
103 string.gx_string_length = text_input -> gx_single_line_text_input_string_size;
104
105 cursor_ptr = &text_input -> gx_single_line_text_input_cursor_instance;
106
107 string_buffer = text_input -> gx_single_line_text_input_buffer;
108
109 _gx_widget_font_get((GX_WIDGET *)text_input, text_input -> gx_prompt_font_id, &gx_font);
110
111 _gx_widget_border_width_get((GX_WIDGET *)text_input, &width);
112 _gx_widget_client_get((GX_WIDGET *)text_input, width, &client);
113
114 switch (text_input -> gx_widget_style & GX_STYLE_TEXT_ALIGNMENT_MASK)
115 {
116 case GX_STYLE_TEXT_RIGHT:
117 x_pos = (GX_VALUE)(client.gx_rectangle_right - 1);
118 break;
119
120 case GX_STYLE_TEXT_CENTER:
121 x_pos = (GX_VALUE)(client.gx_rectangle_left + 1 + ((client.gx_rectangle_right - client.gx_rectangle_left + 1) >> 1));
122 break;
123
124 case GX_STYLE_TEXT_LEFT:
125 default:
126 x_pos = (GX_VALUE)(client.gx_rectangle_left + 1);
127 break;
128 }
129
130 x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset);
131
132 /* Reset mouse down position when it was out of the text show area. */
133 if (pixel_position < client.gx_rectangle_left + 1)
134 {
135 pixel_position = client.gx_rectangle_left + 1;
136 }
137 else if (pixel_position > client.gx_rectangle_right + 1)
138 {
139 pixel_position = client.gx_rectangle_right - 1;
140 }
141
142 /*Compute the distance from the first character position to the mouse down position. */
143 if (pixel_position > x_pos)
144 {
145 distance = (GX_VALUE)(pixel_position - x_pos);
146 }
147 else
148 {
149 distance = 0;
150 }
151
152 new_insert_pos = string.gx_string_length;
153 index = 0;
154 cursor_pos = 0;
155
156 while (string.gx_string_length > 0)
157 {
158 #ifdef GX_UTF8_SUPPORT
159 _gx_utility_utf8_string_character_get(&string, GX_NULL, &glyph_len);
160 #else
161 string.gx_string_ptr++;
162 string.gx_string_length--;
163 #endif
164 utf8_string.gx_string_ptr = string_buffer + index;
165 utf8_string.gx_string_length = glyph_len;
166
167 _gx_system_string_width_get_ext(gx_font, &utf8_string, &width);
168 if ((cursor_pos + width / 2) > distance)
169 {
170 new_insert_pos = index;
171 break;
172 }
173 cursor_pos = (GX_VALUE)(cursor_pos + width);
174 index += glyph_len;
175 }
176
177 /* Update insert position. */
178 text_input -> gx_single_line_text_input_insert_pos = new_insert_pos;
179
180 cursor_pos = (GX_VALUE)(x_pos + cursor_pos);
181
182 if (cursor_pos < client.gx_rectangle_left + 1)
183 {
184 /* Cursor is beyond widget left, adjust text offset to show cursor. */
185 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(client.gx_rectangle_left + 1);
186
187 distance = (GX_VALUE)(client.gx_rectangle_left + 1 - cursor_pos);
188 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset - distance);
189
190 /* Text offset is modified, mark whole text input area dirty. */
191 _gx_system_dirty_mark((GX_WIDGET *)text_input);
192 }
193 else if (cursor_pos > client.gx_rectangle_right - 1)
194 {
195 /* Cursor is beyond widget right, adjust text offset to show cursor. */
196 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(client.gx_rectangle_right - 1);
197
198 distance = (GX_VALUE)(cursor_pos - (client.gx_rectangle_right - 1));
199 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset + distance);
200
201 /* Text offset is modified, mark whole text input area dirty. */
202 _gx_system_dirty_mark((GX_WIDGET *)text_input);
203 }
204 else if (cursor_ptr -> gx_text_input_cursor_pos.gx_point_x != cursor_pos)
205 {
206 /* For this situation, we only need to mark old and new cursor position dirty. */
207 client.gx_rectangle_left = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - (cursor_ptr -> gx_text_input_cursor_width >> 1));
208 client.gx_rectangle_right = (GX_VALUE)(client.gx_rectangle_left + cursor_ptr -> gx_text_input_cursor_width);
209 _gx_system_dirty_partial_add((GX_WIDGET *)text_input, &client);
210
211 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = cursor_pos;
212
213 client.gx_rectangle_left = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - (cursor_ptr -> gx_text_input_cursor_width >> 1));
214 client.gx_rectangle_right = (GX_VALUE)(client.gx_rectangle_left + cursor_ptr -> gx_text_input_cursor_width);
215 _gx_system_dirty_partial_add((GX_WIDGET *)text_input, &client);
216 }
217
218 return GX_SUCCESS;
219 }
220
221
