Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_multi_line_text_input_backspace.c	Lines:	59	59	100.0 %
Date:	2026-03-06 19:21:09	Branches:	28	28	100.0 %


/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2026-present Eclipse ThreadX contributors
 *
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 **************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** GUIX Component                                                        */
/**                                                                       */
/**   Multi Line Text Input Management (Multi Line Text Input)            */
/**                                                                       */
/**************************************************************************/

#define GX_SOURCE_CODE


/* Include necessary system files.  */

#include "gx_api.h"
#include "gx_system.h"
#include "gx_multi_line_text_input.h"
#include "gx_multi_line_text_view.h"
#include "gx_window.h"
#include "gx_widget.h"
#include "gx_utility.h"
#include "gx_scrollbar.h"

/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _gx_multi_line_text_input_backspace                 PORTABLE C      */
/*                                                           6.1.7        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function deletes a character before the cursor.                */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    text_input                            Multi line text input widget  */
/*                                            control block               */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _gx_widget_font_get                   Retrieve font                 */
/*    _gx_utility_rectangle_resize          Increase/Shrink rectangle with*/
/*                                            specified value             */
/*    _gx_utility_utf8_string_character_get Parses utf8 string to         */
/*                                            multi-byte glyph            */
/*    _gx_utility_string_length_check       Test string length            */
/*    _gx_window_scrollbar_find             Find scrollbar for a window   */
/*    _gx_window_client_width_get           Get client width              */
/*    _gx_scrollbar_reset                   Reset scrollbar information   */
/*    _gx_multi_line_text_view_line_cache_update                          */
/*                                          Update line cache             */
/*    _gx_multi_line_text_view_display_info_get                           */
/*                                          Get the number of characters  */
/*                                            that a line can display     */
/*    _gx_multi_line_text_input_char_remove Remove a character            */
/*    _gx_multi_line_text_input_cursor_pos_update                         */
/*                                          Update cursor position        */
/*                                            according to insert index   */
/*    _gx_multi_line_text_view_string_total_rows_compute                  */
/*    _gx_system_string_width_get           Get string width              */
/*    _gx_system_dirty_partial_add          Add one dirty area to dirty   */
/*                                            list                        */
/*                                                                        */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    _gx_multi_line_text_input_keydown_process                           */
/*                                                                        */
/**************************************************************************/
UINT _gx_multi_line_text_input_backspace(GX_MULTI_LINE_TEXT_INPUT *text_input)
{
GX_TEXT_INPUT_CURSOR    *cursor_ptr = &text_input -> gx_multi_line_text_input_cursor_instance;
GX_MULTI_LINE_TEXT_VIEW *view = (GX_MULTI_LINE_TEXT_VIEW *)text_input;
GX_FONT                 *font;
GX_RECTANGLE             client;
GX_RECTANGLE             dirty_rect;
UINT                     insert_pos;
INT                      shift;
INT                      last_visible_line;
GX_VALUE                 line_height;
GX_VALUE                 delete_width;
UINT                     old_text_rows;
UINT                     glyph_len = 1;
GX_STRING                string;
GX_SCROLLBAR            *scroll;
UINT                     start_mark = text_input -> gx_multi_line_text_input_start_mark;
UINT                     end_mark = text_input -> gx_multi_line_text_input_end_mark;

    if (end_mark < start_mark)
    {
        return _gx_multi_line_text_input_delete(text_input);
    }

    insert_pos = text_input -> gx_multi_line_text_input_text_insert_position;

    if (insert_pos > 0)
    {
        _gx_widget_font_get((GX_WIDGET *)text_input, text_input -> gx_multi_line_text_view_font_id, &font);

        if (!font)
        {
            return GX_FAILURE;
        }

        if (start_mark != end_mark)
        {
            glyph_len = (UINT)GX_ABS((INT)start_mark - (INT)end_mark);
            text_input -> gx_multi_line_text_input_start_mark = 0;
            text_input -> gx_multi_line_text_input_end_mark = 0;

            string.gx_string_ptr = &text_input -> gx_multi_line_text_view_text.gx_string_ptr[insert_pos - glyph_len];
        }
        else
        {
            _gx_multi_line_text_input_cursor_visible(text_input);

#ifdef GX_UTF8_SUPPORT
            _gx_utility_utf8_string_backward_character_length_get(&text_input -> gx_multi_line_text_view_text,
                                                                  (INT)(insert_pos - 1), &glyph_len);
#endif

            /* Get the character to be deleted.  */
            string.gx_string_ptr = &text_input -> gx_multi_line_text_view_text.gx_string_ptr[insert_pos - glyph_len];

            if (string.gx_string_ptr[0] == GX_KEY_CARRIAGE_RETURN || string.gx_string_ptr[0] == GX_KEY_LINE_FEED)
            {
                glyph_len = text_input -> gx_multi_line_text_input_new_line_character_size;

                string.gx_string_ptr = &text_input -> gx_multi_line_text_view_text.gx_string_ptr[insert_pos - glyph_len];
            }
        }

        string.gx_string_length = glyph_len;

        /* Get the width of the character to be deleted. */
        _gx_system_string_width_get_ext(font, &string, &delete_width);

        /* Record old shift value.  */
        shift = text_input -> gx_multi_line_text_view_text_scroll_shift;

        /* Remove character before cursor. */
        _gx_multi_line_text_input_char_remove(text_input, insert_pos - glyph_len, glyph_len);

        /* Save old text rows.  */
        old_text_rows = text_input -> gx_multi_line_text_view_text_total_rows;

        /* Calculate new text rows.  */
        _gx_multi_line_text_view_string_total_rows_compute((GX_MULTI_LINE_TEXT_VIEW *)text_input);

        if (old_text_rows != text_input -> gx_multi_line_text_view_text_total_rows)
        {
            _gx_window_scrollbar_find((GX_WINDOW *)text_input, GX_TYPE_VERTICAL_SCROLL, &scroll);
            if (scroll)
            {
                /* Reset scrollbar.  */
                _gx_scrollbar_reset(scroll, GX_NULL);
            }
            else
            {
                if (text_input -> gx_multi_line_text_view_text_total_rows >
                    view -> gx_multi_line_text_view_cache_size)
                {
                    _gx_multi_line_text_view_line_cache_update((GX_MULTI_LINE_TEXT_VIEW *)text_input);
                }
            }
        }

        /* Update text insert position.  */
        text_input -> gx_multi_line_text_input_text_insert_position -= glyph_len;

        client = text_input -> gx_window_client;

        if (text_input -> gx_multi_line_text_view_whitespace)
        {
            /* Offset client bounding box.  */
            _gx_utility_rectangle_resize(&client, (GX_VALUE)(-text_input -> gx_multi_line_text_view_whitespace));
        }

        /* Recalculate cursor position. */
        _gx_multi_line_text_input_cursor_pos_update(text_input, GX_TRUE);

        if (shift == text_input -> gx_multi_line_text_view_text_scroll_shift)
        {

            line_height = (GX_VALUE)(font -> gx_font_line_height + text_input -> gx_multi_line_text_view_line_space);

            if (line_height)
            {
                /* Calculate dirty area. */
                dirty_rect = client;

                dirty_rect.gx_rectangle_top = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_y - (line_height << 1));

                /* Calculate last visible line. */
                last_visible_line = (-text_input -> gx_multi_line_text_view_text_scroll_shift) / line_height;
                last_visible_line = last_visible_line + (INT)view -> gx_multi_line_text_view_text_visible_rows + 1;

                if (last_visible_line > (INT)text_input -> gx_multi_line_text_view_text_total_rows)
                {
                    last_visible_line = (INT)text_input -> gx_multi_line_text_view_text_total_rows;
                }

                shift = (last_visible_line + (INT)old_text_rows - (INT)text_input -> gx_multi_line_text_view_text_total_rows) * line_height + shift;
                shift += client.gx_rectangle_top;

                if (shift < dirty_rect.gx_rectangle_bottom)
                {
                    dirty_rect.gx_rectangle_bottom = (GX_VALUE)shift;
                }

                _gx_system_dirty_partial_add((GX_WIDGET *)text_input, &dirty_rect);
            }
        }
        else
        {
            _gx_system_dirty_mark((GX_WIDGET *)text_input);
        }
    }

    return GX_SUCCESS;
}



Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/***************************************************************************
2			* Copyright (c) 2024 Microsoft Corporation
3			* Copyright (c) 2026-present Eclipse ThreadX contributors
4			*
5			* This program and the accompanying materials are made available under the
6			* terms of the MIT License which is available at
7			* https://opensource.org/licenses/MIT.
8			*
9			* SPDX-License-Identifier: MIT
10			**************************************************************************/
11
12
13			/**************************************************************************/
14			/**************************************************************************/
15			/** */
16			/** GUIX Component */
17			/** */
18			/** Multi Line Text Input Management (Multi 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_system.h"
29			#include "gx_multi_line_text_input.h"
30			#include "gx_multi_line_text_view.h"
31			#include "gx_window.h"
32			#include "gx_widget.h"
33			#include "gx_utility.h"
34			#include "gx_scrollbar.h"
35
36			/**************************************************************************/
37			/* */
38			/* FUNCTION RELEASE */
39			/* */
40			/* _gx_multi_line_text_input_backspace PORTABLE C */
41			/* 6.1.7 */
42			/* AUTHOR */
43			/* */
44			/* Kenneth Maxwell, Microsoft Corporation */
45			/* */
46			/* DESCRIPTION */
47			/* */
48			/* This function deletes a character before the cursor. */
49			/* */
50			/* INPUT */
51			/* */
52			/* text_input Multi line text input widget */
53			/* control block */
54			/* */
55			/* OUTPUT */
56			/* */
57			/* None */
58			/* */
59			/* CALLS */
60			/* */
61			/* _gx_widget_font_get Retrieve font */
62			/* _gx_utility_rectangle_resize Increase/Shrink rectangle with*/
63			/* specified value */
64			/* _gx_utility_utf8_string_character_get Parses utf8 string to */
65			/* multi-byte glyph */
66			/* _gx_utility_string_length_check Test string length */
67			/* _gx_window_scrollbar_find Find scrollbar for a window */
68			/* _gx_window_client_width_get Get client width */
69			/* _gx_scrollbar_reset Reset scrollbar information */
70			/* _gx_multi_line_text_view_line_cache_update */
71			/* Update line cache */
72			/* _gx_multi_line_text_view_display_info_get */
73			/* Get the number of characters */
74			/* that a line can display */
75			/* _gx_multi_line_text_input_char_remove Remove a character */
76			/* _gx_multi_line_text_input_cursor_pos_update */
77			/* Update cursor position */
78			/* according to insert index */
79			/* _gx_multi_line_text_view_string_total_rows_compute */
80			/* _gx_system_string_width_get Get string width */
81			/* _gx_system_dirty_partial_add Add one dirty area to dirty */
82			/* list */
83			/* */
84			/* */
85			/* CALLED BY */
86			/* */
87			/* _gx_multi_line_text_input_keydown_process */
88			/* */
89			/**************************************************************************/
90		457	UINT _gx_multi_line_text_input_backspace(GX_MULTI_LINE_TEXT_INPUT *text_input)
91			{
92		457	GX_TEXT_INPUT_CURSOR *cursor_ptr = &text_input -> gx_multi_line_text_input_cursor_instance;
93		457	GX_MULTI_LINE_TEXT_VIEW view = (GX_MULTI_LINE_TEXT_VIEW )text_input;
94			GX_FONT *font;
95			GX_RECTANGLE client;
96			GX_RECTANGLE dirty_rect;
97			UINT insert_pos;
98			INT shift;
99			INT last_visible_line;
100			GX_VALUE line_height;
101			GX_VALUE delete_width;
102			UINT old_text_rows;
103		457	UINT glyph_len = 1;
104			GX_STRING string;
105			GX_SCROLLBAR *scroll;
106		457	UINT start_mark = text_input -> gx_multi_line_text_input_start_mark;
107		457	UINT end_mark = text_input -> gx_multi_line_text_input_end_mark;
108
109	✓✓	457	if (end_mark < start_mark)
110			{
111		34	return _gx_multi_line_text_input_delete(text_input);
112			}
113
114		423	insert_pos = text_input -> gx_multi_line_text_input_text_insert_position;
115
116	✓✓	423	if (insert_pos > 0)
117			{
118		341	_gx_widget_font_get((GX_WIDGET *)text_input, text_input -> gx_multi_line_text_view_font_id, &font);
119
120	✓✓	341	if (!font)
121			{
122		2	return GX_FAILURE;
123			}
124
125	✓✓	339	if (start_mark != end_mark)
126			{
127		182	glyph_len = (UINT)GX_ABS((INT)start_mark - (INT)end_mark);
128		182	text_input -> gx_multi_line_text_input_start_mark = 0;
129		182	text_input -> gx_multi_line_text_input_end_mark = 0;
130
131		182	string.gx_string_ptr = &text_input -> gx_multi_line_text_view_text.gx_string_ptr[insert_pos - glyph_len];
132			}
133			else
134			{
135		157	_gx_multi_line_text_input_cursor_visible(text_input);
136
137			#ifdef GX_UTF8_SUPPORT
138		157	_gx_utility_utf8_string_backward_character_length_get(&text_input -> gx_multi_line_text_view_text,
139		157	(INT)(insert_pos - 1), &glyph_len);
140			#endif
141
142			/* Get the character to be deleted. */
143		157	string.gx_string_ptr = &text_input -> gx_multi_line_text_view_text.gx_string_ptr[insert_pos - glyph_len];
144
145	✓✓✓✓	157	if (string.gx_string_ptr[0] == GX_KEY_CARRIAGE_RETURN \|\| string.gx_string_ptr[0] == GX_KEY_LINE_FEED)
146			{
147		64	glyph_len = text_input -> gx_multi_line_text_input_new_line_character_size;
148
149		64	string.gx_string_ptr = &text_input -> gx_multi_line_text_view_text.gx_string_ptr[insert_pos - glyph_len];
150			}
151			}
152
153		339	string.gx_string_length = glyph_len;
154
155			/* Get the width of the character to be deleted. */
156		339	_gx_system_string_width_get_ext(font, &string, &delete_width);
157
158			/* Record old shift value. */
159		339	shift = text_input -> gx_multi_line_text_view_text_scroll_shift;
160
161			/* Remove character before cursor. */
162		339	_gx_multi_line_text_input_char_remove(text_input, insert_pos - glyph_len, glyph_len);
163
164			/* Save old text rows. */
165		339	old_text_rows = text_input -> gx_multi_line_text_view_text_total_rows;
166
167			/* Calculate new text rows. */
168		339	_gx_multi_line_text_view_string_total_rows_compute((GX_MULTI_LINE_TEXT_VIEW *)text_input);
169
170	✓✓	339	if (old_text_rows != text_input -> gx_multi_line_text_view_text_total_rows)
171			{
172		205	_gx_window_scrollbar_find((GX_WINDOW *)text_input, GX_TYPE_VERTICAL_SCROLL, &scroll);
173	✓✓	205	if (scroll)
174			{
175			/* Reset scrollbar. */
176		143	_gx_scrollbar_reset(scroll, GX_NULL);
177			}
178			else
179			{
180		62	if (text_input -> gx_multi_line_text_view_text_total_rows >
181	✓✓	62	view -> gx_multi_line_text_view_cache_size)
182			{
183		1	_gx_multi_line_text_view_line_cache_update((GX_MULTI_LINE_TEXT_VIEW *)text_input);
184			}
185			}
186			}
187
188			/* Update text insert position. */
189		339	text_input -> gx_multi_line_text_input_text_insert_position -= glyph_len;
190
191		339	client = text_input -> gx_window_client;
192
193	✓✓	339	if (text_input -> gx_multi_line_text_view_whitespace)
194			{
195			/* Offset client bounding box. */
196		206	_gx_utility_rectangle_resize(&client, (GX_VALUE)(-text_input -> gx_multi_line_text_view_whitespace));
197			}
198
199			/* Recalculate cursor position. */
200		339	_gx_multi_line_text_input_cursor_pos_update(text_input, GX_TRUE);
201
202	✓✓	339	if (shift == text_input -> gx_multi_line_text_view_text_scroll_shift)
203			{
204
205		271	line_height = (GX_VALUE)(font -> gx_font_line_height + text_input -> gx_multi_line_text_view_line_space);
206
207	✓✓	271	if (line_height)
208			{
209			/* Calculate dirty area. */
210		270	dirty_rect = client;
211
212		270	dirty_rect.gx_rectangle_top = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_y - (line_height << 1));
213
214			/* Calculate last visible line. */
215		270	last_visible_line = (-text_input -> gx_multi_line_text_view_text_scroll_shift) / line_height;
216		270	last_visible_line = last_visible_line + (INT)view -> gx_multi_line_text_view_text_visible_rows + 1;
217
218	✓✓	270	if (last_visible_line > (INT)text_input -> gx_multi_line_text_view_text_total_rows)
219			{
220		147	last_visible_line = (INT)text_input -> gx_multi_line_text_view_text_total_rows;
221			}
222
223		270	shift = (last_visible_line + (INT)old_text_rows - (INT)text_input -> gx_multi_line_text_view_text_total_rows) * line_height + shift;
224		270	shift += client.gx_rectangle_top;
225
226	✓✓	270	if (shift < dirty_rect.gx_rectangle_bottom)
227			{
228		86	dirty_rect.gx_rectangle_bottom = (GX_VALUE)shift;
229			}
230
231		270	_gx_system_dirty_partial_add((GX_WIDGET *)text_input, &dirty_rect);
232			}
233			}
234			else
235			{
236		68	_gx_system_dirty_mark((GX_WIDGET *)text_input);
237			}
238			}
239
240		421	return GX_SUCCESS;
241			}
242