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 /**   Scroll Management (Scroll)                                          */
19 /**                                                                       */
20 /**************************************************************************/
21 
22 #define GX_SOURCE_CODE
23 
24 /* Include necessary system files.  */
25 
26 #include "gx_api.h"
27 #include "gx_system.h"
28 #include "gx_widget.h"
29 #include "gx_scrollbar.h"
30 
31 
32 /**************************************************************************/
33 /*                                                                        */
34 /*  FUNCTION                                               RELEASE        */
35 /*                                                                        */
36 /*    _gx_scrollbar_limit_check                           PORTABLE C      */
37 /*                                                           6.1          */
38 /*  AUTHOR                                                                */
39 /*                                                                        */
40 /*    Kenneth Maxwell, Microsoft Corporation                              */
41 /*                                                                        */
42 /*  DESCRIPTION                                                           */
43 /*                                                                        */
44 /*    Check the scrollbar assigned value and make sure it is within the   */
45 /*    range limits.                                                       */
46 /*                                                                        */
47 /*  INPUT                                                                 */
48 /*                                                                        */
49 /*    scrollbar                             Scrollbar control block       */
50 /*                                                                        */
51 /*  OUTPUT                                                                */
52 /*                                                                        */
53 /*    status                                Completion status             */
54 /*                                                                        */
55 /*  CALLS                                                                 */
56 /*                                                                        */
57 /*    None                                                                */
58 /*                                                                        */
59 /*  CALLED BY                                                             */
60 /*                                                                        */
61 /*    Application Code                                                    */
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 /*                                                                        */
71 /**************************************************************************/
_gx_scrollbar_limit_check(GX_SCROLLBAR * scrollbar)72 UINT  _gx_scrollbar_limit_check(GX_SCROLLBAR *scrollbar)
73 {
74 
75     if (scrollbar -> gx_scrollbar_info.gx_scroll_value >
76         ((scrollbar -> gx_scrollbar_info.gx_scroll_maximum - scrollbar -> gx_scrollbar_info.gx_scroll_visible) + 1))
77     {
78         scrollbar -> gx_scrollbar_info.gx_scroll_value =
79             (scrollbar -> gx_scrollbar_info.gx_scroll_maximum - scrollbar -> gx_scrollbar_info.gx_scroll_visible) + 1;
80     }
81 
82     if (scrollbar -> gx_scrollbar_info.gx_scroll_value < scrollbar -> gx_scrollbar_info.gx_scroll_minimum)
83     {
84         scrollbar -> gx_scrollbar_info.gx_scroll_value = scrollbar -> gx_scrollbar_info.gx_scroll_minimum;
85     }
86 
87     return(GX_SUCCESS);
88 }
89 
90