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 /** Prompt Management (Slider) */
18 /** */
19 /**************************************************************************/
20
21 #define GX_SOURCE_CODE
22
23 /* Include necessary system files. */
24
25 #include "gx_api.h"
26 #include "gx_system.h"
27 #include "gx_display.h"
28 #include "gx_context.h"
29 #include "gx_widget.h"
30 #include "gx_utility.h"
31 #include "gx_slider.h"
32
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _gx_slider_value_calculate PORTABLE C */
38 /* 6.1 */
39 /* AUTHOR */
40 /* */
41 /* Kenneth Maxwell, Microsoft Corporation */
42 /* */
43 /* DESCRIPTION */
44 /* */
45 /* This service calculates the slider value. */
46 /* */
47 /* INPUT */
48 /* */
49 /* slider Slider widget control block */
50 /* info Pointer to slider info */
51 /* new_position New slider position */
52 /* */
53 /* OUTPUT */
54 /* */
55 /* status Completion status */
56 /* None */
57 /* */
58 /* CALLS */
59 /* */
60 /* _gx_slider_travel_get Get the slider travel */
61 /* _gx_slider_value_set Set the slider value */
62 /* */
63 /* CALLED BY */
64 /* */
65 /* Application Code */
66 /* GUIX Internal Code */
67 /* */
68 /* RELEASE HISTORY */
69 /* */
70 /* DATE NAME DESCRIPTION */
71 /* */
72 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
73 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
74 /* resulting in version 6.1 */
75 /* */
76 /**************************************************************************/
_gx_slider_value_calculate(GX_SLIDER * slider,GX_SLIDER_INFO * info,INT new_position)77 UINT _gx_slider_value_calculate(GX_SLIDER *slider, GX_SLIDER_INFO *info, INT new_position)
78 {
79 INT newval;
80 INT mintravel;
81 INT maxtravel;
82
83 /* get travel limits */
84 _gx_slider_travel_get(slider, info, &mintravel, &maxtravel);
85
86 /* make sure we don't allow travel too far */
87 if (new_position < mintravel)
88 {
89 new_position = mintravel;
90 }
91 else
92 {
93 if (new_position > maxtravel)
94 {
95 new_position = maxtravel;
96 }
97 }
98
99 /* use position to calculate new value */
100 if (maxtravel > mintravel)
101 {
102 /* do linear interpolation using input position to
103 determine new slider value
104 */
105
106 /* get distance from starting point */
107
108 if (slider -> gx_widget_style & GX_STYLE_SLIDER_VERTICAL)
109 {
110 newval = maxtravel - new_position;
111 }
112 else
113 {
114 newval = new_position - mintravel;
115 }
116
117 newval = GX_FIXED_VAL_MAKE(newval);
118
119 /* multiply by value range */
120 newval *= info -> gx_slider_info_max_val - info -> gx_slider_info_min_val;
121
122 /* divide by travel range */
123 newval /= (maxtravel - mintravel);
124 newval = GX_FIXED_VAL_RND(newval);
125
126 /* offset by min value */
127 newval += info -> gx_slider_info_min_val;
128
129 /* has the value changed? */
130 if (newval != info -> gx_slider_info_current_val)
131 {
132 /* yes, re-assign value which will move the needle */
133 _gx_slider_value_set(slider, info, newval);
134 }
135 }
136 return(GX_SUCCESS);
137 }
138
139
