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_text_input_cursor.h"
33 #include "gx_utility.h"
34
35 /**************************************************************************/
36 /* */
37 /* FUNCTION RELEASE */
38 /* */
39 /* _gx_single_line_text_input_mark_previous PORTABLE C */
40 /* 6.1 */
41 /* AUTHOR */
42 /* */
43 /* Kenneth Maxwell, Microsoft Corporation */
44 /* */
45 /* DESCRIPTION */
46 /* */
47 /* This function highlights the character before the end mark position.*/
48 /* */
49 /* INPUT */
50 /* */
51 /* text_input Single-line text input widget */
52 /* control block */
53 /* */
54 /* OUTPUT */
55 /* */
56 /* None */
57 /* */
58 /* CALLS */
59 /* */
60 /* _gx_utility_utf8_string_character_get Parse utf8 string to */
61 /* multi-byte glyph */
62 /* _gx_widget_border_width_get Get the widget border width */
63 /* _gx_widget_client_get Get widget client rectangle */
64 /* _gx_widget_font_get Get font by specified ID */
65 /* _gx_system_string_width_get Get the width of a string */
66 /* _gx_system_dirty_partial_add Mark the partial area of a */
67 /* widget as dirty */
68 /* _gx_text_input_cursor_dirty_rectangle_get */
69 /* Get cursor rectangle */
70 /* */
71 /* CALLED BY */
72 /* */
73 /* GUIX Internal Code */
74 /* */
75 /* RELEASE HISTORY */
76 /* */
77 /* DATE NAME DESCRIPTION */
78 /* */
79 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
80 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
81 /* resulting in version 6.1 */
82 /* */
83 /**************************************************************************/
_gx_single_line_text_input_mark_previous(GX_SINGLE_LINE_TEXT_INPUT * text_input)84 UINT _gx_single_line_text_input_mark_previous(GX_SINGLE_LINE_TEXT_INPUT *text_input)
85 {
86 GX_TEXT_INPUT_CURSOR *cursor_ptr = &text_input -> gx_single_line_text_input_cursor_instance;
87 GX_RECTANGLE client;
88 GX_RECTANGLE cursor_rect;
89 GX_VALUE new_cursor_pos;
90 GX_VALUE width;
91 GX_FONT *gx_font;
92 UINT glyph_len = 1;
93 GX_BOOL mark_all = GX_FALSE;
94 UINT start_mark = text_input -> gx_single_line_text_input_start_mark;
95 UINT end_mark = text_input -> gx_single_line_text_input_end_mark;
96 GX_STRING string;
97
98 if (start_mark == end_mark)
99 {
100 start_mark = text_input -> gx_single_line_text_input_insert_pos;
101 end_mark = text_input -> gx_single_line_text_input_insert_pos;
102
103 text_input -> gx_single_line_text_input_start_mark = start_mark;
104 text_input -> gx_single_line_text_input_end_mark = end_mark;
105 }
106
107 string.gx_string_ptr = (GX_CONST GX_CHAR *)text_input -> gx_single_line_text_input_buffer;
108 string.gx_string_length = text_input -> gx_single_line_text_input_string_size;
109
110 if (end_mark > 0)
111 {
112 #ifdef GX_UTF8_SUPPORT
113 /* Get the glyph length of the character before end mark */
114 _gx_utility_utf8_string_backward_character_length_get(&string, (INT)(end_mark - 1), &glyph_len);
115 #endif
116
117 text_input -> gx_single_line_text_input_end_mark -= glyph_len;
118 text_input -> gx_single_line_text_input_insert_pos -= glyph_len;
119
120 /* Pick up widget border width. */
121 _gx_widget_border_width_get((GX_WIDGET *)text_input, &width);
122
123 /* Get widget client rectangle. */
124 _gx_widget_client_get((GX_WIDGET *)text_input, width, &client);
125
126 /* Pick up text font. */
127 _gx_widget_font_get((GX_WIDGET *)text_input, text_input -> gx_prompt_font_id, &gx_font);
128
129 /* Get width of the character before end mark. */
130 string.gx_string_ptr += (end_mark - glyph_len);
131 string.gx_string_length = glyph_len;
132 _gx_system_string_width_get_ext(gx_font, &string, &width);
133
134 new_cursor_pos = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - width);
135
136 switch (text_input -> gx_widget_style & GX_STYLE_TEXT_ALIGNMENT_MASK)
137 {
138 case GX_STYLE_TEXT_CENTER:
139 break;
140
141 case GX_STYLE_TEXT_RIGHT:
142 case GX_STYLE_TEXT_LEFT:
143 default:
144 if (new_cursor_pos < client.gx_rectangle_left + 1)
145 {
146 /* The previous marked character is out of client area, update x offset. */
147 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset -
148 client.gx_rectangle_left - 1 + new_cursor_pos);
149
150 new_cursor_pos = (GX_VALUE)(client.gx_rectangle_left + 1);
151
152 /* Should mark all widget as dirty*/
153 mark_all = GX_TRUE;
154 }
155 else if (new_cursor_pos > client.gx_rectangle_right - 1)
156 {
157 /* Cursor position is out of client rectangle, update x offset. */
158 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset +
159 new_cursor_pos - client.gx_rectangle_right + 1);
160 new_cursor_pos = (GX_VALUE)(client.gx_rectangle_right - 1);
161
162 /* Should mark all widget as dirty. */
163 mark_all = GX_TRUE;
164 }
165 break;
166 }
167
168
169 if (!mark_all)
170 {
171 client.gx_rectangle_left = new_cursor_pos;
172 client.gx_rectangle_right = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - 1);
173
174 if (start_mark == end_mark)
175 {
176 /* Get old cursor rectangle. */
177 _gx_text_input_cursor_dirty_rectangle_get(cursor_ptr, &cursor_rect);
178
179 /* Combine with old cursor rectangle. */
180 _gx_utility_rectangle_combine(&client, &cursor_rect);
181 }
182 }
183
184 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = new_cursor_pos;
185
186 _gx_system_dirty_partial_add((GX_WIDGET *)text_input, &client);
187 }
188
189 return GX_SUCCESS;
190 }
191
192
