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 /** Scroll Wheel Management (Generic Scroll Wheel) */ 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_utility.h" 29 #include "gx_scroll_wheel.h" 30 31 /**************************************************************************/ 32 /* */ 33 /* FUNCTION RELEASE */ 34 /* */ 35 /* _gx_generic_scroll_wheel_down_wrap PORTABLE C */ 36 /* 6.1.7 */ 37 /* AUTHOR */ 38 /* */ 39 /* Ting Zhu, Microsoft Corporation */ 40 /* */ 41 /* DESCRIPTION */ 42 /* */ 43 /* This function scrolls down the generic scroll wheel. */ 44 /* */ 45 /* INPUT */ 46 /* */ 47 /* wheel Generic scroll wheel control */ 48 /* block */ 49 /* */ 50 /* OUTPUT */ 51 /* */ 52 /* None */ 53 /* */ 54 /* CALLS */ 55 /* */ 56 /* _gx_widget_first_visible_client_child_get */ 57 /* Get the first visible client */ 58 /* _gx_widget_last_visible_client_child_get */ 59 /* Get the last visible client */ 60 /* _gx_widget_detach Detach a widget from its */ 61 /* parent */ 62 /* _gx_utility_rectangle_shift Shift a rectangle */ 63 /* _gx_widget_resize Resize a widget */ 64 /* _gx_widget_back_attach Attach a widget to its parent */ 65 /* [gx_generic_scroll_wheel_callback] Callback to create row item */ 66 /* */ 67 /* CALLED BY */ 68 /* */ 69 /* _gx_generic_scroll_wheel_scroll Generic scroll wheel scroll */ 70 /* function */ 71 /* */ 72 /* RELEASE HISTORY */ 73 /* */ 74 /* DATE NAME DESCRIPTION */ 75 /* */ 76 /* 06-02-2021 Ting Zhu Initial Version 6.1.7 */ 77 /* */ 78 /**************************************************************************/ _gx_generic_scroll_wheel_down_wrap(GX_GENERIC_SCROLL_WHEEL * wheel)79VOID _gx_generic_scroll_wheel_down_wrap(GX_GENERIC_SCROLL_WHEEL *wheel) 80 { 81 GX_WIDGET *test; 82 GX_WIDGET *check; 83 GX_RECTANGLE newpos; 84 85 while ((wheel -> gx_generic_scroll_wheel_top_index > 0) || 86 (wheel -> gx_widget_style & GX_STYLE_WRAP)) 87 { 88 /* Scrolling down, see if my bottom widget can be moved to the top. */ 89 test = _gx_widget_last_visible_client_child_get((GX_WIDGET *)wheel); 90 91 if (test && (test -> gx_widget_size.gx_rectangle_top > wheel -> gx_widget_size.gx_rectangle_bottom)) 92 { 93 94 /* Bottom widget is below my client area, move it to the top. */ 95 wheel -> gx_generic_scroll_wheel_top_index--; 96 97 /* Wrap index. */ 98 if (wheel -> gx_generic_scroll_wheel_top_index < 0) 99 { 100 wheel -> gx_generic_scroll_wheel_top_index = wheel -> gx_scroll_wheel_total_rows - 1; 101 } 102 103 check = _gx_widget_first_visible_client_child_get((GX_WIDGET *)wheel); 104 105 if (check) 106 { 107 _gx_widget_detach(test); 108 newpos = test -> gx_widget_size; 109 _gx_utility_rectangle_shift(&newpos, 0, (GX_VALUE)(-(newpos.gx_rectangle_bottom - check -> gx_widget_size.gx_rectangle_top + 1))); 110 _gx_widget_resize(test, &newpos); 111 112 wheel -> gx_generic_scroll_wheel_callback(wheel, test, wheel -> gx_generic_scroll_wheel_top_index); 113 _gx_widget_back_attach((GX_WIDGET *)wheel, test); 114 } 115 else 116 { 117 break; 118 } 119 } 120 else 121 { 122 break; 123 } 124 } 125 } 126 127
