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_scroll_wheel.h"
28 #include "gx_system.h"
29 #include "gx_utility.h"
30 
31 /**************************************************************************/
32 /*                                                                        */
33 /*  FUNCTION                                               RELEASE        */
34 /*                                                                        */
35 /*    _gx_scroll_wheel_gradient_alpha_set                 PORTABLE C      */
36 /*                                                           6.1          */
37 /*  AUTHOR                                                                */
38 /*                                                                        */
39 /*    Kenneth Maxwell, Microsoft Corporation                              */
40 /*                                                                        */
41 /*  DESCRIPTION                                                           */
42 /*                                                                        */
43 /*    This function sets the start and end alpha of gradient pixelmap that*/
44 /*    used to cover the top and bottom of a text scroll wheel widget.     */
45 /*                                                                        */
46 /*  INPUT                                                                 */
47 /*                                                                        */
48 /*    wheel                                 Scroll wheel control block    */
49 /*    start_alpha                           Start alpha                   */
50 /*    end_alpha                             End alpha                     */
51 /*                                                                        */
52 /*  OUTPUT                                                                */
53 /*                                                                        */
54 /*    status                                Completion status             */
55 /*                                                                        */
56 /*  CALLS                                                                 */
57 /*                                                                        */
58 /*    _gx_scroll_wheel_gradient_create      Create a gradient pixelmap    */
59 /*    _gx_system_dirty_mark                 Mark a widget as dirty        */
60 /*                                                                        */
61 /*  CALLED BY                                                             */
62 /*                                                                        */
63 /*    Application Code                                                    */
64 /*                                                                        */
65 /*  RELEASE HISTORY                                                       */
66 /*                                                                        */
67 /*    DATE              NAME                      DESCRIPTION             */
68 /*                                                                        */
69 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
70 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
71 /*                                            resulting in version 6.1    */
72 /*                                                                        */
73 /**************************************************************************/
_gx_scroll_wheel_gradient_alpha_set(GX_SCROLL_WHEEL * wheel,GX_UBYTE start_alpha,GX_UBYTE end_alpha)74 UINT _gx_scroll_wheel_gradient_alpha_set(GX_SCROLL_WHEEL *wheel, GX_UBYTE start_alpha, GX_UBYTE end_alpha)
75 {
76     wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_start = start_alpha;
77     wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_end = end_alpha;
78 
79     if (wheel -> gx_widget_status & GX_STATUS_VISIBLE)
80     {
81         _gx_scroll_wheel_gradient_create(wheel);
82         _gx_system_dirty_mark((GX_WIDGET *)wheel);
83     }
84 
85     return GX_SUCCESS;
86 }
87 
88