/*************************************************************************** * 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 */ /** */ /** 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_view.h" #include "gx_text_input_cursor.h" #include "gx_multi_line_text_input.h" #include "gx_context.h" #include "gx_window.h" #include "gx_widget.h" #include "gx_utility.h" #include "gx_canvas.h" #include "gx_scrollbar.h" /**************************************************************************/ /* */ /* FUNCTION RELEASE */ /* */ /* _gx_multi_line_text_input_draw PORTABLE C */ /* 6.1 */ /* AUTHOR */ /* */ /* Kenneth Maxwell, Microsoft Corporation */ /* */ /* DESCRIPTION */ /* */ /* This function draws the multi-line text input widget, which is a */ /* special type of widget. */ /* */ /* INPUT */ /* */ /* text_input Multi line text input */ /* control block */ /* */ /* OUTPUT */ /* */ /* None */ /* */ /* CALLS */ /* */ /* _gx_context_font_get Retrieve font */ /* _gx_multi_line_text_view_draw Draw the text view area */ /* _gx_text_input_cursor_draw Draw the cursor */ /* */ /* 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 */ /* */ /**************************************************************************/ VOID _gx_multi_line_text_input_draw(GX_MULTI_LINE_TEXT_INPUT *input) { GX_TEXT_INPUT_CURSOR *cursor_ptr = &input -> gx_multi_line_text_input_cursor_instance; GX_VALUE line_height = 0; GX_FONT *font; GX_RESOURCE_ID fill_color; GX_RESOURCE_ID text_color; UINT line_start_mark; UINT line_end_mark; UINT end_mark; UINT index; GX_STRING private_string; GX_STRING draw_string; INT x_pos; INT y_pos; GX_RECTANGLE client; GX_RECTANGLE draw_area; GX_CANVAS *canvas; UINT first_visible_line; UINT last_visible_line; UINT line_start_index; UINT line_end_index; UINT line_cache_start; GX_VALUE text_width; GX_VALUE client_width; GX_SCROLLBAR *scroll; GX_VALUE space_width; if (input -> gx_widget_style & GX_STYLE_ENABLED) { if (input -> gx_widget_style & GX_STYLE_TEXT_INPUT_READONLY) { fill_color = input -> gx_multi_line_text_input_readonly_fill_color; text_color = input -> gx_multi_line_text_input_readonly_text_color; } else { fill_color = input -> gx_widget_normal_fill_color; text_color = input -> gx_multi_line_text_view_normal_text_color; } } else { fill_color = input -> gx_widget_disabled_fill_color; text_color = input -> gx_multi_line_text_view_disabled_text_color; } /* Draw background. */ _gx_window_border_draw((GX_WINDOW *)input, fill_color); if (input -> gx_multi_line_text_view_line_index_old) { /* Get visible rows. */ _gx_multi_line_text_view_visible_rows_compute((GX_MULTI_LINE_TEXT_VIEW *)input); /* Calculate text total rows. */ _gx_multi_line_text_view_string_total_rows_compute((GX_MULTI_LINE_TEXT_VIEW *)input); _gx_window_scrollbar_find((GX_WINDOW *)input, GX_TYPE_VERTICAL_SCROLL, &scroll); if (scroll) { /* Reset scrollbar. */ _gx_scrollbar_reset(scroll, GX_NULL); } else { if (input -> gx_multi_line_text_view_text_total_rows > input -> gx_multi_line_text_view_cache_size) { /* Update line cache. */ _gx_multi_line_text_view_line_cache_update((GX_MULTI_LINE_TEXT_VIEW *)input); } } _gx_multi_line_text_input_cursor_pos_update(input, GX_TRUE); } if ((input -> gx_multi_line_text_input_start_mark == input -> gx_multi_line_text_input_end_mark) || !(input -> gx_widget_style & GX_STYLE_ENABLED)) { /* Draw text. */ _gx_multi_line_text_view_text_draw((GX_MULTI_LINE_TEXT_VIEW *)input, text_color); /* Draw the cursor. */ if ((input -> gx_widget_status & GX_STATUS_CURSOR_SHOW) && (input -> gx_widget_status & GX_STATUS_CURSOR_DRAW)) { _gx_context_font_get(input -> gx_multi_line_text_view_font_id, &font); if (font) { line_height = (GX_VALUE)(font -> gx_font_line_height + input -> gx_multi_line_text_view_line_space); } if (!(cursor_ptr -> gx_text_input_cursor_flags & GX_CURSOR_USE_CUSTOM_HEIGHT)) { cursor_ptr -> gx_text_input_cursor_height = line_height; } _gx_text_input_cursor_draw(cursor_ptr); } } else { line_start_mark = input -> gx_multi_line_text_input_start_mark; end_mark = input -> gx_multi_line_text_input_end_mark; if (line_start_mark > end_mark) { GX_SWAP_VALS(line_start_mark, end_mark); } _gx_context_font_get(input -> gx_multi_line_text_view_font_id, &font); _gx_context_font_set(input -> gx_multi_line_text_view_font_id); _gx_context_brush_width_set(0); /* Is there a string and font? */ if ((input -> gx_multi_line_text_view_text.gx_string_length) && (font)) { /* pick up current canvas */ canvas = _gx_system_current_draw_context -> gx_draw_context_canvas; /* Pick up client area. */ client = input -> gx_window_client; /* Offset client area by the size of whitespace. */ _gx_utility_rectangle_resize(&client, (GX_VALUE)(-input -> gx_multi_line_text_view_whitespace)); _gx_utility_rectangle_overlap_detect(&_gx_system_current_draw_context -> gx_draw_context_dirty, &client, &draw_area); _gx_canvas_drawing_initiate(canvas, (GX_WIDGET *)input, &draw_area); /* Pickup text height. */ line_height = (GX_VALUE)(font -> gx_font_line_height + input -> gx_multi_line_text_view_line_space); if (line_height) { first_visible_line = ((UINT)(-input -> gx_multi_line_text_view_text_scroll_shift)) / (UINT)line_height; last_visible_line = first_visible_line + input -> gx_multi_line_text_view_text_visible_rows; if (last_visible_line > input -> gx_multi_line_text_view_text_total_rows - 1) { last_visible_line = input -> gx_multi_line_text_view_text_total_rows - 1; } /* Compute the start displaying position of pixels in x direction and y direction. */ y_pos = client.gx_rectangle_top; y_pos += input -> gx_multi_line_text_view_text_scroll_shift; y_pos += (input -> gx_multi_line_text_view_line_space >> 1); y_pos += (INT)first_visible_line * line_height; _gx_system_private_string_get(&input -> gx_multi_line_text_view_text, &private_string, input -> gx_widget_style); draw_string.gx_string_ptr = " "; draw_string.gx_string_length = 1; _gx_system_string_width_get_ext(font, &draw_string, &space_width); for (index = first_visible_line; index <= last_visible_line; index++) { line_cache_start = input -> gx_multi_line_text_view_first_cache_line; line_start_index = input -> gx_multi_line_text_view_line_index[index - line_cache_start]; if ((INT)(index - line_cache_start) >= (INT)(input -> gx_multi_line_text_view_cache_size - 1)) { line_end_index = input -> gx_multi_line_text_view_text.gx_string_length; } else { line_end_index = input -> gx_multi_line_text_view_line_index[index - line_cache_start + 1]; } switch (input -> gx_widget_style & GX_STYLE_TEXT_ALIGNMENT_MASK) { case GX_STYLE_TEXT_RIGHT: draw_string.gx_string_ptr = private_string.gx_string_ptr + line_start_index; draw_string.gx_string_length = line_end_index - line_start_index; _gx_system_string_width_get_ext(font, &draw_string, &text_width); while (text_width > (client.gx_rectangle_right - client.gx_rectangle_left - 2)) { text_width = (GX_VALUE)(text_width - space_width); } x_pos = client.gx_rectangle_right - 1; x_pos = (GX_VALUE)(x_pos - text_width); break; case GX_STYLE_TEXT_LEFT: x_pos = client.gx_rectangle_left + 1; break; case GX_STYLE_TEXT_CENTER: default: draw_string.gx_string_ptr = private_string.gx_string_ptr + line_start_index; draw_string.gx_string_length = line_end_index - line_start_index; _gx_system_string_width_get_ext(font, &draw_string, &text_width); client_width = (GX_VALUE)(client.gx_rectangle_right - client.gx_rectangle_left + 1); while (text_width > (client_width - 3)) { text_width = (GX_VALUE)(text_width - space_width); } x_pos = (GX_VALUE)(client.gx_rectangle_left + ((client_width - text_width) / 2)); break; } if ((line_start_mark < line_end_index) && (end_mark > line_start_index)) { if (line_start_mark < line_start_index) { line_start_mark = line_start_index; } if (line_start_mark > line_start_index) { /* Draw text[line_start_index : start_mark - 1] with normal text color. */ _gx_context_line_color_set(text_color); draw_string.gx_string_ptr = private_string.gx_string_ptr + line_start_index; draw_string.gx_string_length = line_start_mark - line_start_index; _gx_system_string_width_get_ext(font, &draw_string, &text_width); _gx_canvas_text_draw_ext((GX_VALUE)x_pos, (GX_VALUE)y_pos, &draw_string); x_pos += text_width; } if (end_mark < line_end_index) { line_end_mark = end_mark; } else { line_end_mark = line_end_index; } /* Draw text[start_mark: end_mark - 1] with hightlight text color. */ _gx_context_line_color_set(input -> gx_multi_line_text_view_selected_text_color); _gx_context_fill_color_set(input -> gx_widget_selected_fill_color); draw_string.gx_string_ptr = private_string.gx_string_ptr + line_start_mark; draw_string.gx_string_length = line_end_mark - line_start_mark; _gx_system_string_width_get_ext(font, &draw_string, &text_width); draw_area.gx_rectangle_left = (GX_VALUE)x_pos; draw_area.gx_rectangle_right = (GX_VALUE)(x_pos + text_width - 1); draw_area.gx_rectangle_top = (GX_VALUE)(y_pos - (input -> gx_multi_line_text_view_line_space >> 1)); draw_area.gx_rectangle_bottom = (GX_VALUE)(draw_area.gx_rectangle_top + line_height - 1); while (draw_area.gx_rectangle_right > client.gx_rectangle_right - 1) { draw_area.gx_rectangle_right = (GX_VALUE)(draw_area.gx_rectangle_right - space_width); } _gx_canvas_rectangle_draw(&draw_area); draw_string.gx_string_ptr = private_string.gx_string_ptr + line_start_mark; draw_string.gx_string_length = line_end_mark - line_start_mark; _gx_canvas_text_draw_ext((GX_VALUE)x_pos, (GX_VALUE)y_pos, &draw_string); x_pos += text_width; /* Draw text[end_mark : line_end_index] width normal text color. */ if (line_end_mark < line_end_index) { _gx_context_line_color_set(text_color); draw_string.gx_string_ptr = private_string.gx_string_ptr + line_end_mark; draw_string.gx_string_length = line_end_index - line_end_mark; _gx_canvas_text_draw_ext((GX_VALUE)x_pos, (GX_VALUE)y_pos, &draw_string); } if (end_mark > line_end_index) { line_start_mark = line_end_index; } } else { _gx_context_line_color_set(text_color); /* Draw the text. */ draw_string.gx_string_ptr = private_string.gx_string_ptr + line_start_index; draw_string.gx_string_length = line_end_index - line_start_index; _gx_canvas_text_draw_ext((GX_VALUE)x_pos, (GX_VALUE)y_pos, &draw_string); } y_pos += line_height; } } _gx_canvas_drawing_complete(canvas, GX_FALSE); } } /* Draw widget's children. */ _gx_widget_children_draw((GX_WIDGET *)input); }