1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** GUIX Component */
16 /** */
17 /** Text Input Management (Single Line Text Input) */
18 /** */
19 /**************************************************************************/
20
21 #define GX_SOURCE_CODE
22
23
24 /* Include necessary system files. */
25
26 #include "gx_api.h"
27 #include "gx_system.h"
28 #include "gx_widget.h"
29 #include "gx_single_line_text_input.h"
30 #include "gx_utility.h"
31
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _gx_single_line_text_input_character_delete PORTABLE C */
37 /* 6.1 */
38 /* AUTHOR */
39 /* */
40 /* Kenneth Maxwell, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This service deletes the character after the text input cursor */
45 /* position. */
46 /* */
47 /* INPUT */
48 /* */
49 /* text_input Single line text input */
50 /* control blcok */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* None */
55 /* */
56 /* CALLS */
57 /* */
58 /* memmove Move a block of memory */
59 /* _gx_widget_border_width_get Get widget border width */
60 /* _gx_widget_client_get Get widget client rectangle */
61 /* _gx_widget_font_get Get font by specified ID */
62 /* _gx_system_string_width_get Get the width of a string */
63 /* _gx_system_dirty_partial_add Mark the partial area of a */
64 /* widget as dirty */
65 /* _gx_utility_utf8_string_character_get Parse utf8 string to */
66 /* multi-byte glyph */
67 /* _gx_single_line_text_input_position_update */
68 /* Update cursor position */
69 /* according to insert position*/
70 /* */
71 /* CALLED BY */
72 /* */
73 /* Application Code */
74 /* GUIX Internal Code */
75 /* */
76 /* RELEASE HISTORY */
77 /* */
78 /* DATE NAME DESCRIPTION */
79 /* */
80 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
81 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
82 /* resulting in version 6.1 */
83 /* */
84 /**************************************************************************/
_gx_single_line_text_input_character_delete(GX_SINGLE_LINE_TEXT_INPUT * text_input)85 UINT _gx_single_line_text_input_character_delete(GX_SINGLE_LINE_TEXT_INPUT *text_input)
86 {
87 GX_TEXT_INPUT_CURSOR *cursor_ptr = &text_input -> gx_single_line_text_input_cursor_instance;
88 UINT insert_pos;
89 GX_CHAR *string_buffer;
90 UINT string_size;
91 GX_VALUE border_width;
92 GX_VALUE text_width;
93 GX_RECTANGLE client;
94 GX_RECTANGLE dirty_area;
95 GX_FONT *gx_font;
96 GX_VALUE x_pos;
97 GX_VALUE offset;
98 GX_VALUE del_char_width;
99 UINT glyph_len = 1;
100
101 GX_STRING string;
102
103 if (text_input -> gx_single_line_text_input_end_mark > text_input -> gx_single_line_text_input_start_mark)
104 {
105 return _gx_single_line_text_input_backspace(text_input);
106 }
107
108 insert_pos = text_input -> gx_single_line_text_input_insert_pos;
109 string_buffer = text_input -> gx_single_line_text_input_buffer;
110 string_size = text_input -> gx_single_line_text_input_string_size;
111
112 if (insert_pos < string_size)
113 {
114 _gx_widget_border_width_get((GX_WIDGET *)text_input, &border_width);
115 _gx_widget_client_get((GX_WIDGET *)text_input, border_width, &client);
116
117 if (text_input -> gx_single_line_text_input_start_mark != text_input -> gx_single_line_text_input_end_mark)
118 {
119 glyph_len = text_input -> gx_single_line_text_input_start_mark - text_input -> gx_single_line_text_input_end_mark;
120
121 if (cursor_ptr -> gx_text_input_cursor_pos.gx_point_x <= client.gx_rectangle_left ||
122 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x >= client.gx_rectangle_right)
123 {
124 _gx_single_line_text_input_left_arrow(text_input);
125 }
126 text_input -> gx_single_line_text_input_start_mark = 0;
127 text_input -> gx_single_line_text_input_end_mark = 0;
128 }
129 #ifdef GX_UTF8_SUPPORT
130 else
131 {
132 string.gx_string_ptr = string_buffer + insert_pos;
133 string.gx_string_length = string_size - insert_pos;
134
135 _gx_utility_utf8_string_character_get(&string, GX_NULL, &glyph_len);
136 }
137 #endif
138 dirty_area = client;
139
140 _gx_widget_font_get((GX_WIDGET *)text_input, text_input -> gx_prompt_font_id, &gx_font);
141
142 /* Pick up text witth. */
143 string.gx_string_ptr = string_buffer;
144 string.gx_string_length = text_input -> gx_single_line_text_input_string_size;
145
146 _gx_system_string_width_get_ext(gx_font, &string, &text_width);
147
148 string.gx_string_ptr = string_buffer + insert_pos;
149 string.gx_string_length = glyph_len;
150
151 _gx_system_string_width_get_ext(gx_font, &string, &del_char_width);
152
153 switch (text_input -> gx_widget_style & GX_STYLE_TEXT_ALIGNMENT_MASK)
154 {
155 case GX_STYLE_TEXT_RIGHT:
156 x_pos = (GX_VALUE)(client.gx_rectangle_right - 1);
157 x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset);
158
159 if (x_pos + text_width > client.gx_rectangle_right - 1)
160 {
161 offset = (GX_VALUE)((x_pos + text_width - del_char_width) - (client.gx_rectangle_right - 1));
162
163 if (offset < 0)
164 {
165 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset + offset);
166 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - offset);
167 }
168 }
169 else
170 {
171 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset - del_char_width);
172 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x + del_char_width);
173
174 dirty_area.gx_rectangle_right = cursor_ptr -> gx_text_input_cursor_pos.gx_point_x;
175 }
176 break;
177
178 case GX_STYLE_TEXT_CENTER:
179 x_pos = (GX_VALUE)(client.gx_rectangle_left + 1);
180 x_pos = (GX_VALUE)(x_pos + ((client.gx_rectangle_right - client.gx_rectangle_left + 1) >> 1));
181 x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset);
182 if (text_width <= (client.gx_rectangle_right - client.gx_rectangle_left + 1 - border_width))
183 {
184 dirty_area.gx_rectangle_left = (GX_VALUE)(x_pos - (cursor_ptr -> gx_text_input_cursor_width >> 1));
185 dirty_area.gx_rectangle_right = (GX_VALUE)(x_pos + text_width + ((cursor_ptr -> gx_text_input_cursor_width + 1) >> 1) - 1);
186 }
187 /* Calculate the cursor position. */
188 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)((text_width - del_char_width + 1) >> 1);
189 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x +
190 (((text_width + 1) >> 1) - text_input -> gx_single_line_text_input_xoffset));
191 break;
192
193 case GX_STYLE_TEXT_LEFT:
194 default:
195 x_pos = (GX_VALUE)(client.gx_rectangle_left + 1);
196 x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset);
197
198 if (x_pos < client.gx_rectangle_left + 1)
199 {
200 offset = (GX_VALUE)((client.gx_rectangle_right - 1) - (x_pos + text_width - del_char_width));
201
202 if (offset > 0)
203 {
204 if (offset > (client.gx_rectangle_left + 1 - x_pos))
205 {
206 offset = (GX_VALUE)(client.gx_rectangle_left + 1 - x_pos);
207 }
208
209 text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset - offset);
210 cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x + offset);
211 }
212 }
213 else
214 {
215 dirty_area.gx_rectangle_left = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - (cursor_ptr -> gx_text_input_cursor_width >> 1));
216 dirty_area.gx_rectangle_right = (GX_VALUE)(x_pos + text_width + cursor_ptr -> gx_text_input_cursor_width - 1);
217 }
218 break;
219 }
220
221
222 /* Delete a character from the string buffer. */
223 memmove(string_buffer + insert_pos, string_buffer + insert_pos + glyph_len, string_size - insert_pos - glyph_len);
224
225 string_buffer[string_size - glyph_len] = '\0';
226 text_input -> gx_single_line_text_input_string_size -= glyph_len;
227
228 /* Mark text input be changed. */
229 text_input -> gx_single_line_text_input_was_modified = GX_TRUE;
230
231 _gx_system_dirty_partial_add((GX_WIDGET *)text_input, &dirty_area);
232 }
233
234 return GX_SUCCESS;
235 }
236
237
