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 (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_system.h" 28 #include "gx_scroll_wheel.h" 29 30 /**************************************************************************/ 31 /* */ 32 /* FUNCTION RELEASE */ 33 /* */ 34 /* _gx_scroll_wheel_scroll PORTABLE C */ 35 /* 6.1.7 */ 36 /* AUTHOR */ 37 /* */ 38 /* Kenneth Maxwell, Microsoft Corporation */ 39 /* */ 40 /* DESCRIPTION */ 41 /* */ 42 /* This function scrolls a scroll widget widget. */ 43 /* */ 44 /* INPUT */ 45 /* */ 46 /* wheel Scroll wheel control block */ 47 /* shift Value to be shift */ 48 /* */ 49 /* OUTPUT */ 50 /* */ 51 /* status Completion status */ 52 /* */ 53 /* CALLS */ 54 /* */ 55 /* _gx_scroll_wheel_selected_row_calculate */ 56 /* Calculate current selected row*/ 57 /* _gx_system_dirty_mark Mark a widget as dirty */ 58 /* */ 59 /* CALLED BY */ 60 /* */ 61 /* _gx_scroll_wheel_event_process */ 62 /* */ 63 /* RELEASE HISTORY */ 64 /* */ 65 /* DATE NAME DESCRIPTION */ 66 /* */ 67 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ 68 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */ 69 /* resulting in version 6.1 */ 70 /* 06-02-2021 Ting Zhu Modified comment(s), */ 71 /* modified wrap style test */ 72 /* logic, */ 73 /* resulting in version 6.1.7 */ 74 /* */ 75 /**************************************************************************/ _gx_scroll_wheel_scroll(GX_SCROLL_WHEEL * wheel,GX_VALUE shift)76UINT _gx_scroll_wheel_scroll(GX_SCROLL_WHEEL *wheel, GX_VALUE shift) 77 { 78 INT y_shift; 79 INT min_shift; 80 INT max_shift; 81 82 if (!wheel -> gx_scroll_wheel_wrap_style_check(wheel)) 83 { 84 y_shift = wheel -> gx_scroll_wheel_selected_yshift + shift; 85 86 if ((shift > 0 && wheel -> gx_scroll_wheel_selected_row == 0) || 87 (shift < 0 && wheel -> gx_scroll_wheel_selected_row == wheel -> gx_scroll_wheel_total_rows - 1)) 88 { 89 y_shift = wheel -> gx_scroll_wheel_selected_yshift + shift; 90 91 min_shift = (wheel -> gx_scroll_wheel_selected_row - wheel -> gx_scroll_wheel_total_rows + 1) * 92 wheel -> gx_scroll_wheel_row_height; 93 max_shift = (wheel -> gx_scroll_wheel_selected_row * wheel -> gx_scroll_wheel_row_height); 94 95 if ((y_shift < min_shift) || (y_shift > max_shift)) 96 { 97 shift = (GX_VALUE)(shift + wheel -> gx_scroll_wheel_shift_error); 98 wheel -> gx_scroll_wheel_shift_error = (GX_BYTE)(shift % 4); 99 shift /= 4; 100 } 101 else 102 { 103 wheel -> gx_scroll_wheel_shift_error = 0; 104 } 105 } 106 } 107 108 wheel -> gx_scroll_wheel_selected_yshift = (GX_VALUE)(wheel -> gx_scroll_wheel_selected_yshift + shift); 109 110 _gx_scroll_wheel_selected_row_calculate(wheel); 111 112 if (wheel -> gx_widget_status & GX_STATUS_VISIBLE) 113 { 114 _gx_system_dirty_mark((GX_WIDGET *)wheel); 115 } 116 return GX_SUCCESS; 117 } 118 119
