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