1 /*************************************************************************** 2 * Copyright (c) 2024 Microsoft Corporation 3 * 4 * This program and the accompanying materials are made available under the 5 * terms of the MIT License which is available at 6 * https://opensource.org/licenses/MIT. 7 * 8 * SPDX-License-Identifier: MIT 9 **************************************************************************/ 10 11 12 /**************************************************************************/ 13 /**************************************************************************/ 14 /** */ 15 /** GUIX Component */ 16 /** */ 17 /** List Management (List) */ 18 /** */ 19 /**************************************************************************/ 20 21 #define GX_SOURCE_CODE 22 23 24 /* Include necessary system files. */ 25 26 #include "gx_api.h" 27 #include "gx_widget.h" 28 #include "gx_window.h" 29 #include "gx_system.h" 30 #include "gx_scrollbar.h" 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _gx_vertical_list_slide_back_check PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Kenneth Maxwell, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This function checks the sliding back of the scrollbar. */ 45 /* */ 46 /* INPUT */ 47 /* */ 48 /* vertical_list Vertical list widget control */ 49 /* block */ 50 /* */ 51 /* OUTPUT */ 52 /* */ 53 /* None */ 54 /* */ 55 /* CALLS */ 56 /* */ 57 /* _gx_first_client_child_get Get the first child widget */ 58 /* _gx_system_timer_start Allocate a free timer and */ 59 /* activate it */ 60 /* _gx_last_client_child_get Get the last client child */ 61 /* */ 62 /* CALLED BY */ 63 /* */ 64 /* Application Code */ 65 /* */ 66 /* RELEASE HISTORY */ 67 /* */ 68 /* DATE NAME DESCRIPTION */ 69 /* */ 70 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ 71 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */ 72 /* resulting in version 6.1 */ 73 /* */ 74 /**************************************************************************/ _gx_vertical_list_slide_back_check(GX_VERTICAL_LIST * list)75VOID _gx_vertical_list_slide_back_check(GX_VERTICAL_LIST *list) 76 { 77 GX_WIDGET *child; 78 INT page_index; 79 80 if (list -> gx_vertical_list_child_count <= 0) 81 { 82 return; 83 } 84 85 /* Calculate page index. */ 86 page_index = list -> gx_vertical_list_top_index; 87 88 child = _gx_widget_first_client_child_get((GX_WIDGET *)list); 89 90 while (child && (child -> gx_widget_size.gx_rectangle_top <= list -> gx_widget_size.gx_rectangle_top)) 91 { 92 page_index++; 93 child = _gx_widget_next_client_child_get(child); 94 } 95 96 list -> gx_vertical_list_snap_back_distance = 0; 97 98 if (page_index == 0) 99 { 100 child = _gx_widget_first_client_child_get((GX_WIDGET *)list); 101 if (child && (child -> gx_widget_size.gx_rectangle_top > list -> gx_window_client.gx_rectangle_top)) 102 { 103 list -> gx_vertical_list_snap_back_distance = (GX_VALUE)(list -> gx_window_client.gx_rectangle_top - 104 child -> gx_widget_size.gx_rectangle_top); 105 _gx_system_timer_start((GX_WIDGET *)list, GX_SNAP_TIMER, 1, 1); 106 } 107 } 108 else 109 { 110 if (list -> gx_vertical_list_top_index + list -> gx_vertical_list_child_count >= list -> gx_vertical_list_total_rows - 1) 111 { 112 child = _gx_widget_last_client_child_get((GX_WIDGET *)list); 113 if (child && (child -> gx_widget_size.gx_rectangle_bottom < list -> gx_window_client.gx_rectangle_bottom)) 114 { 115 list -> gx_vertical_list_snap_back_distance = (GX_VALUE)(list -> gx_window_client.gx_rectangle_bottom - 116 child -> gx_widget_size.gx_rectangle_bottom); 117 _gx_system_timer_start((GX_WIDGET *)list, GX_SNAP_TIMER, 1, 1); 118 } 119 } 120 } 121 } 122 123
