/*************************************************************************** * Copyright (c) 2024 Microsoft Corporation * * 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 */ /** */ /** Text Input Management (Single Line Text Input) */ /** */ /**************************************************************************/ #define GX_SOURCE_CODE /* Include necessary system files. */ #include "gx_api.h" #include "gx_system.h" #include "gx_widget.h" #include "gx_single_line_text_input.h" #include "gx_utility.h" /**************************************************************************/ /* */ /* FUNCTION RELEASE */ /* */ /* _gx_single_line_text_input_character_delete PORTABLE C */ /* 6.1 */ /* AUTHOR */ /* */ /* Kenneth Maxwell, Microsoft Corporation */ /* */ /* DESCRIPTION */ /* */ /* This service deletes the character after the text input cursor */ /* position. */ /* */ /* INPUT */ /* */ /* text_input Single line text input */ /* control blcok */ /* */ /* OUTPUT */ /* */ /* None */ /* */ /* CALLS */ /* */ /* memmove Move a block of memory */ /* _gx_widget_border_width_get Get widget border width */ /* _gx_widget_client_get Get widget client rectangle */ /* _gx_widget_font_get Get font by specified ID */ /* _gx_system_string_width_get Get the width of a string */ /* _gx_system_dirty_partial_add Mark the partial area of a */ /* widget as dirty */ /* _gx_utility_utf8_string_character_get Parse utf8 string to */ /* multi-byte glyph */ /* _gx_single_line_text_input_position_update */ /* Update cursor position */ /* according to insert position*/ /* */ /* CALLED BY */ /* */ /* Application Code */ /* GUIX Internal Code */ /* */ /* RELEASE HISTORY */ /* */ /* DATE NAME DESCRIPTION */ /* */ /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ /* 09-30-2020 Kenneth Maxwell Modified comment(s), */ /* resulting in version 6.1 */ /* */ /**************************************************************************/ UINT _gx_single_line_text_input_character_delete(GX_SINGLE_LINE_TEXT_INPUT *text_input) { GX_TEXT_INPUT_CURSOR *cursor_ptr = &text_input -> gx_single_line_text_input_cursor_instance; UINT insert_pos; GX_CHAR *string_buffer; UINT string_size; GX_VALUE border_width; GX_VALUE text_width; GX_RECTANGLE client; GX_RECTANGLE dirty_area; GX_FONT *gx_font; GX_VALUE x_pos; GX_VALUE offset; GX_VALUE del_char_width; UINT glyph_len = 1; GX_STRING string; if (text_input -> gx_single_line_text_input_end_mark > text_input -> gx_single_line_text_input_start_mark) { return _gx_single_line_text_input_backspace(text_input); } insert_pos = text_input -> gx_single_line_text_input_insert_pos; string_buffer = text_input -> gx_single_line_text_input_buffer; string_size = text_input -> gx_single_line_text_input_string_size; if (insert_pos < string_size) { _gx_widget_border_width_get((GX_WIDGET *)text_input, &border_width); _gx_widget_client_get((GX_WIDGET *)text_input, border_width, &client); if (text_input -> gx_single_line_text_input_start_mark != text_input -> gx_single_line_text_input_end_mark) { glyph_len = text_input -> gx_single_line_text_input_start_mark - text_input -> gx_single_line_text_input_end_mark; if (cursor_ptr -> gx_text_input_cursor_pos.gx_point_x <= client.gx_rectangle_left || cursor_ptr -> gx_text_input_cursor_pos.gx_point_x >= client.gx_rectangle_right) { _gx_single_line_text_input_left_arrow(text_input); } text_input -> gx_single_line_text_input_start_mark = 0; text_input -> gx_single_line_text_input_end_mark = 0; } #ifdef GX_UTF8_SUPPORT else { string.gx_string_ptr = string_buffer + insert_pos; string.gx_string_length = string_size - insert_pos; _gx_utility_utf8_string_character_get(&string, GX_NULL, &glyph_len); } #endif dirty_area = client; _gx_widget_font_get((GX_WIDGET *)text_input, text_input -> gx_prompt_font_id, &gx_font); /* Pick up text witth. */ string.gx_string_ptr = string_buffer; string.gx_string_length = text_input -> gx_single_line_text_input_string_size; _gx_system_string_width_get_ext(gx_font, &string, &text_width); string.gx_string_ptr = string_buffer + insert_pos; string.gx_string_length = glyph_len; _gx_system_string_width_get_ext(gx_font, &string, &del_char_width); switch (text_input -> gx_widget_style & GX_STYLE_TEXT_ALIGNMENT_MASK) { case GX_STYLE_TEXT_RIGHT: x_pos = (GX_VALUE)(client.gx_rectangle_right - 1); x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset); if (x_pos + text_width > client.gx_rectangle_right - 1) { offset = (GX_VALUE)((x_pos + text_width - del_char_width) - (client.gx_rectangle_right - 1)); if (offset < 0) { text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset + offset); cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - offset); } } else { text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset - del_char_width); 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); dirty_area.gx_rectangle_right = cursor_ptr -> gx_text_input_cursor_pos.gx_point_x; } break; case GX_STYLE_TEXT_CENTER: x_pos = (GX_VALUE)(client.gx_rectangle_left + 1); x_pos = (GX_VALUE)(x_pos + ((client.gx_rectangle_right - client.gx_rectangle_left + 1) >> 1)); x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset); if (text_width <= (client.gx_rectangle_right - client.gx_rectangle_left + 1 - border_width)) { dirty_area.gx_rectangle_left = (GX_VALUE)(x_pos - (cursor_ptr -> gx_text_input_cursor_width >> 1)); dirty_area.gx_rectangle_right = (GX_VALUE)(x_pos + text_width + ((cursor_ptr -> gx_text_input_cursor_width + 1) >> 1) - 1); } /* Calculate the cursor position. */ text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)((text_width - del_char_width + 1) >> 1); cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x + (((text_width + 1) >> 1) - text_input -> gx_single_line_text_input_xoffset)); break; case GX_STYLE_TEXT_LEFT: default: x_pos = (GX_VALUE)(client.gx_rectangle_left + 1); x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset); if (x_pos < client.gx_rectangle_left + 1) { offset = (GX_VALUE)((client.gx_rectangle_right - 1) - (x_pos + text_width - del_char_width)); if (offset > 0) { if (offset > (client.gx_rectangle_left + 1 - x_pos)) { offset = (GX_VALUE)(client.gx_rectangle_left + 1 - x_pos); } text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset - offset); cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x + offset); } } else { 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)); dirty_area.gx_rectangle_right = (GX_VALUE)(x_pos + text_width + cursor_ptr -> gx_text_input_cursor_width - 1); } break; } /* Delete a character from the string buffer. */ memmove(string_buffer + insert_pos, string_buffer + insert_pos + glyph_len, string_size - insert_pos - glyph_len); string_buffer[string_size - glyph_len] = '\0'; text_input -> gx_single_line_text_input_string_size -= glyph_len; /* Mark text input be changed. */ text_input -> gx_single_line_text_input_was_modified = GX_TRUE; _gx_system_dirty_partial_add((GX_WIDGET *)text_input, &dirty_area); } return GX_SUCCESS; }