1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** GUIX Component */ 17 /** */ 18 /** Rich Text View Management (Rich Text View) */ 19 /** */ 20 /**************************************************************************/ 21 22 #define GX_SOURCE_CODE 23 24 25 /* Include necessary system files. */ 26 27 #include "gx_api.h" 28 #include "gx_system.h" 29 #include "gx_window.h" 30 #include "gx_widget.h" 31 #include "gx_utility.h" 32 #include "gx_rich_text_view.h" 33 34 /**************************************************************************/ 35 /* */ 36 /* FUNCTION RELEASE */ 37 /* */ 38 /* _gx_rich_text_view_scroll_info_get PORTABLE C */ 39 /* 6.1 */ 40 /* AUTHOR */ 41 /* */ 42 /* Kenneth Maxwell, Microsoft Corporation */ 43 /* */ 44 /* DESCRIPTION */ 45 /* */ 46 /* This function gets the rich text view scroll information. */ 47 /* */ 48 /* INPUT */ 49 /* */ 50 /* text_view Rich text view control block */ 51 /* style Reserved */ 52 /* info Pointer to destination for */ 53 /* scroll info */ 54 /* */ 55 /* OUTPUT */ 56 /* */ 57 /* status Completion status */ 58 /* */ 59 /* CALLS */ 60 /* */ 61 /* _gx_widget_font_get Obtain the font */ 62 /* _gx_multi_line_text_view_string_total_rows_computer */ 63 /* Compute the number of rows */ 64 /* for the text view text */ 65 /* _gx_utility_rectangle_resize Offset rectangle */ 66 /* */ 67 /* CALLED BY */ 68 /* */ 69 /* GUIX Internal Code */ 70 /* */ 71 /* RELEASE HISTORY */ 72 /* */ 73 /* DATE NAME DESCRIPTION */ 74 /* */ 75 /* 09-30-2020 Kenneth Maxwell Initial Version 6.1 */ 76 /* */ 77 /**************************************************************************/ _gx_rich_text_view_scroll_info_get(GX_RICH_TEXT_VIEW * text_view,ULONG style,GX_SCROLL_INFO * info)78UINT _gx_rich_text_view_scroll_info_get(GX_RICH_TEXT_VIEW *text_view, ULONG style, GX_SCROLL_INFO *info) 79 { 80 GX_RECTANGLE client; 81 GX_VALUE line_height; 82 INT text_height; 83 INT value; 84 INT shift; 85 GX_FONT *font; 86 87 GX_PARAMETER_NOT_USED(style); 88 89 /* Get font. */ 90 _gx_widget_font_get((GX_WIDGET *)text_view, text_view -> gx_rich_text_view_fonts.gx_rich_text_fonts_normal_id, &font); 91 92 if (!font) 93 { 94 return GX_FAILURE; 95 } 96 97 if (text_view -> gx_multi_line_text_view_line_index_old) 98 { 99 /* Calculate text total height. */ 100 _gx_rich_text_view_text_total_height_calculate(text_view); 101 } 102 103 /* Pickup text height. */ 104 line_height = (GX_VALUE)(font -> gx_font_line_height + text_view -> gx_multi_line_text_view_line_space); 105 text_height = (INT)text_view -> gx_rich_text_view_text_total_height; 106 107 client = text_view -> gx_window_client; 108 109 if (text_view -> gx_multi_line_text_view_whitespace) 110 { 111 /* Offset client bounding box. */ 112 _gx_utility_rectangle_resize(&client, (GX_VALUE)(-text_view -> gx_multi_line_text_view_whitespace)); 113 } 114 115 info -> gx_scroll_minimum = client.gx_rectangle_top; 116 info -> gx_scroll_maximum = info -> gx_scroll_minimum + text_height - 1; 117 info -> gx_scroll_visible = (GX_VALUE)(client.gx_rectangle_bottom - client.gx_rectangle_top + 1); 118 119 if (text_height < info -> gx_scroll_visible) 120 { 121 info -> gx_scroll_maximum = info -> gx_scroll_minimum + info -> gx_scroll_visible - 1; 122 } 123 124 shift = text_view -> gx_multi_line_text_view_text_scroll_shift; 125 value = client.gx_rectangle_top - shift; 126 127 if (value < info -> gx_scroll_minimum) 128 { 129 value = info -> gx_scroll_minimum; 130 } 131 else if (value > info -> gx_scroll_maximum - info -> gx_scroll_visible + 1) 132 { 133 value = info -> gx_scroll_maximum - info -> gx_scroll_visible + 1; 134 } 135 136 shift = client.gx_rectangle_top - value; 137 138 if (shift != text_view -> gx_multi_line_text_view_text_scroll_shift) 139 { 140 /* Update shift value. */ 141 text_view -> gx_multi_line_text_view_text_scroll_shift = shift; 142 } 143 144 info -> gx_scroll_value = value; 145 info -> gx_scroll_increment = line_height; 146 147 return GX_SUCCESS; 148 } 149 150
