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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 View Management (Multi Line Text View) */ |
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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_widget.h" |
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#include "gx_utility.h" |
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#include "gx_multi_line_text_view.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_view_scroll_info_get PORTABLE C */ |
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/* 6.1 */ |
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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 gets the multi-line text view scroll information. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* text_view Multi line text view widget */ |
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/* control block */ |
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/* style Style */ |
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/* info Pointer to destination for */ |
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/* scroll info */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_widget_font_get Obtain the font */ |
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/* _gx_multi_line_text_view_string_total_rows_computer */ |
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/* Compute the number of rows */ |
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/* for the text view text */ |
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/* _gx_utility_rectangle_resize Offset rectangle */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* GUIX Internal Code */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_multi_line_text_view_scroll_info_get(GX_MULTI_LINE_TEXT_VIEW *text_view, ULONG style, GX_SCROLL_INFO *info) |
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{ |
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GX_RECTANGLE client; |
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GX_VALUE line_height; |
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INT text_height; |
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INT value; |
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INT shift; |
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GX_FONT *font; |
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GX_PARAMETER_NOT_USED(style); |
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/* Get font. */ |
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_gx_widget_font_get((GX_WIDGET *)text_view, text_view -> gx_multi_line_text_view_font_id, &font); |
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✓✓ |
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if (!font) |
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{ |
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return GX_FAILURE; |
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} |
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✓✓ |
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if (text_view -> gx_multi_line_text_view_line_index_old) |
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{ |
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/* Calculate text total rows. */ |
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_gx_multi_line_text_view_string_total_rows_compute(text_view); |
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} |
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/* Pickup text height. */ |
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line_height = (GX_VALUE)(font -> gx_font_line_height + text_view -> gx_multi_line_text_view_line_space); |
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text_height = (INT)(line_height * (INT)text_view -> gx_multi_line_text_view_text_total_rows); |
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client = text_view -> gx_window_client; |
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✓✓ |
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if (text_view -> gx_multi_line_text_view_whitespace) |
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{ |
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/* Offset client bounding box. */ |
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_gx_utility_rectangle_resize(&client, (GX_VALUE)(-text_view -> gx_multi_line_text_view_whitespace)); |
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} |
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info -> gx_scroll_minimum = client.gx_rectangle_top; |
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info -> gx_scroll_maximum = info -> gx_scroll_minimum + text_height - 1; |
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info -> gx_scroll_visible = (GX_VALUE)(client.gx_rectangle_bottom - client.gx_rectangle_top + 1); |
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✓✓ |
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if (text_height < info -> gx_scroll_visible) |
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{ |
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info -> gx_scroll_maximum = info -> gx_scroll_minimum + info -> gx_scroll_visible - 1; |
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} |
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shift = text_view -> gx_multi_line_text_view_text_scroll_shift; |
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value = client.gx_rectangle_top - shift; |
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✓✓ |
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if (value < info -> gx_scroll_minimum) |
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{ |
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value = info -> gx_scroll_minimum; |
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} |
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✓✓ |
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else if (value > info -> gx_scroll_maximum - info -> gx_scroll_visible + 1) |
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{ |
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value = info -> gx_scroll_maximum - info -> gx_scroll_visible + 1; |
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} |
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shift = client.gx_rectangle_top - value; |
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✓✓ |
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if (shift != text_view -> gx_multi_line_text_view_text_scroll_shift) |
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{ |
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/* Update shift value. */ |
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text_view -> gx_multi_line_text_view_text_scroll_shift = shift; |
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} |
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info -> gx_scroll_value = value; |
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info -> gx_scroll_increment = line_height; |
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if (text_view -> gx_multi_line_text_view_text_total_rows > |
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✓✓ |
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text_view -> gx_multi_line_text_view_cache_size) |
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{ |
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_gx_multi_line_text_view_line_cache_update((GX_MULTI_LINE_TEXT_VIEW *)text_view); |
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} |
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return GX_SUCCESS; |
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} |
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