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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** GUIX Component */ |
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/** */ |
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/** Multi Line Text Input Management (Multi Line Text Input) */ |
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/** */ |
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/**************************************************************************/ |
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#define GX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "gx_api.h" |
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#include "gx_system.h" |
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#include "gx_window.h" |
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#include "gx_scrollbar.h" |
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#include "gx_multi_line_text_input.h" |
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#include "gx_multi_line_text_view.h" |
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#include "gx_text_input_cursor.h" |
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#include "gx_utility.h" |
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#include "gx_widget.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_multi_line_text_input_mark_previous PORTABLE C */ |
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/* 6.1.7 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function moves highlight text end mark one character left. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* text_input Multi line text input */ |
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/* control block */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_text_input_cursor_dirty_rectangle_get */ |
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/* Get cursor rectangle */ |
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/* _gx_multi_line_text_input_cursor_pos_update */ |
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/* Calculate cursor position */ |
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/* according to insert index */ |
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/* _gx_system_dirty_partial_add Add one dirty area to */ |
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/* dirty list */ |
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/* _gx_system_dirty_mark Mark widget area dirty */ |
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/* _gx_utility_utf8_string_character_get Parses utf8 string to */ |
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/* multi-byte glyph */ |
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/* _gx_utility_string_length_check Test string length */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* _gx_multi_line_text_input_keydown_process */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_multi_line_text_input_mark_previous(GX_MULTI_LINE_TEXT_INPUT *text_input) |
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{ |
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GX_TEXT_INPUT_CURSOR *cursor_ptr = &text_input -> gx_multi_line_text_input_cursor_instance; |
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GX_CONST GX_CHAR *string; |
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INT old_shift; |
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GX_RECTANGLE cur_rect; |
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UINT glyph_len = 1; |
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UINT cursor_line; |
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GX_POINT start_pos; |
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GX_POINT end_pos; |
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UINT start_mark = text_input -> gx_multi_line_text_input_start_mark; |
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UINT end_mark = text_input -> gx_multi_line_text_input_end_mark; |
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✓✓ |
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if (start_mark == end_mark) |
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{ |
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start_mark = text_input -> gx_multi_line_text_input_text_insert_position; |
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end_mark = text_input -> gx_multi_line_text_input_text_insert_position; |
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text_input -> gx_multi_line_text_input_start_mark = start_mark; |
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text_input -> gx_multi_line_text_input_end_mark = end_mark; |
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} |
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✓✓ |
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if (end_mark > 0) |
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{ |
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cursor_line = (UINT)(text_input -> gx_multi_line_text_input_text_cursor_line - 1); |
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cursor_line = (UINT)(cursor_line - text_input -> gx_multi_line_text_view_first_cache_line); |
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#ifdef GX_UTF8_SUPPORT |
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_gx_utility_utf8_string_backward_character_length_get(&text_input -> gx_multi_line_text_view_text, |
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(INT)(end_mark - 1), &glyph_len); |
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#endif |
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string = &text_input -> gx_multi_line_text_view_text.gx_string_ptr[end_mark - glyph_len]; |
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✓✓✓✓
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if (string[0] == GX_KEY_CARRIAGE_RETURN || string[0] == GX_KEY_LINE_FEED) |
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{ |
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glyph_len = text_input -> gx_multi_line_text_input_new_line_character_size; |
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} |
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text_input -> gx_multi_line_text_input_end_mark -= glyph_len; |
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/* Record scroll shift before recalculate cursor position. */ |
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old_shift = text_input -> gx_multi_line_text_view_text_scroll_shift; |
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start_pos = cursor_ptr -> gx_text_input_cursor_pos; |
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text_input -> gx_multi_line_text_input_text_insert_position = text_input -> gx_multi_line_text_input_end_mark; |
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_gx_multi_line_text_input_cursor_pos_update(text_input, GX_TRUE); |
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/* Dirty mark. */ |
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✓✓ |
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if (old_shift == text_input -> gx_multi_line_text_view_text_scroll_shift) |
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{ |
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end_pos = cursor_ptr -> gx_text_input_cursor_pos; |
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_gx_multi_line_text_input_text_rectangle_get(text_input, start_pos, end_pos, &cur_rect); |
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/* Mark highlight area as dirty. */ |
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_gx_system_dirty_partial_add((GX_WIDGET *)text_input, &cur_rect); |
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} |
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else |
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{ |
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_gx_system_dirty_mark((GX_WIDGET *)text_input); |
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} |
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} |
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return GX_SUCCESS; |
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} |
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