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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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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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/** Vertical List Management */ |
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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_widget.h" |
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#include "gx_window.h" |
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#include "gx_system.h" |
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#include "gx_scrollbar.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_vertical_list_scroll_info_get PORTABLE C */ |
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/* 6.4.0 */ |
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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 scrollbar information. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* win Pointer to window */ |
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/* style Style */ |
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/* info Information of scrollbar */ |
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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_first_client_child_get Get the first client child */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
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/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* 12-31-2023 Ting Zhu Modified comments(s), */ |
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/* improved the calculation of */ |
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/* the maximum scrolling value.*/ |
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/* resulting in version 6.4.0 */ |
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/* */ |
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/**************************************************************************/ |
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VOID _gx_vertical_list_scroll_info_get(GX_VERTICAL_LIST *list, ULONG style, GX_SCROLL_INFO *info) |
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{ |
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INT value; |
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GX_VALUE height; |
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GX_WIDGET *child; |
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GX_PARAMETER_NOT_USED(style); |
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✓✓ |
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if (list -> gx_vertical_list_callback) |
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{ |
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/* If list callback is set, children winthin the list should share the same height. */ |
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info -> gx_scroll_maximum = (list->gx_vertical_list_total_rows * list -> gx_vertical_list_child_height - 1); |
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} |
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else |
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{ |
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info -> gx_scroll_maximum = 0; |
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child = _gx_widget_first_client_child_get((GX_WIDGET *)list); |
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✓✓ |
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while (child) |
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{ |
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_gx_widget_height_get(child, &height); |
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info -> gx_scroll_maximum += height; |
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child = _gx_widget_next_client_child_get(child); |
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} |
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} |
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info -> gx_scroll_minimum = 0; |
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info -> gx_scroll_visible = (GX_VALUE)(list -> gx_window_client.gx_rectangle_bottom - list -> gx_window_client.gx_rectangle_top + 1); |
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✓✓ |
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if (info -> gx_scroll_maximum <= info -> gx_scroll_visible) |
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{ |
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info -> gx_scroll_value = 0; |
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info -> gx_scroll_increment = 0; |
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info -> gx_scroll_maximum = info->gx_scroll_visible; |
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return; |
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} |
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value = list -> gx_vertical_list_top_index * list -> gx_vertical_list_child_height; |
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✓✗ |
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if (list -> gx_vertical_list_top_index >= 0) |
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{ |
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child = _gx_widget_first_client_child_get((GX_WIDGET *)list); |
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✓✗ |
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if (child) |
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{ |
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value += list -> gx_window_client.gx_rectangle_top - child -> gx_widget_size.gx_rectangle_top; |
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} |
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} |
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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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else |
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{ |
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✓✓ |
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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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} |
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info -> gx_scroll_value = value; |
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info -> gx_scroll_increment = list -> gx_vertical_list_child_height / 2; |
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} |
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