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 /** Tree View Management (Menu) */
18 /** */
19 /**************************************************************************/
20
21 #define GX_SOURCE_CODE
22
23
24 /* Include necessary system files. */
25
26 #include "gx_api.h"
27 #include "gx_tree_view.h"
28
29 /**************************************************************************/
30 /* */
31 /* FUNCTION RELEASE */
32 /* */
33 /* _gx_tree_view_scroll_info_get PORTABLE C */
34 /* 6.1 */
35 /* AUTHOR */
36 /* */
37 /* Kenneth Maxwell, Microsoft Corporation */
38 /* */
39 /* DESCRIPTION */
40 /* */
41 /* This function gets the tree view scroll information. */
42 /* */
43 /* INPUT */
44 /* */
45 /* tree Pointer to tree view control */
46 /* block */
47 /* type GX_SCROLLBAR_HORIZONTAL */
48 /* or GX_SCROLLBAR_VERTICAL */
49 /* info Pointer to destination for */
50 /* scroll info */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* status Completion status */
55 /* */
56 /* CALLS */
57 /* */
58 /* _gx_tree_view_scroll Scroll tree view client area */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* GUIX Internal Code */
63 /* */
64 /* RELEASE HISTORY */
65 /* */
66 /* DATE NAME DESCRIPTION */
67 /* */
68 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
69 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
70 /* resulting in version 6.1 */
71 /* */
72 /**************************************************************************/
_gx_tree_view_scroll_info_get(GX_TREE_VIEW * tree,ULONG type,GX_SCROLL_INFO * info)73 UINT _gx_tree_view_scroll_info_get(GX_TREE_VIEW *tree, ULONG type, GX_SCROLL_INFO *info)
74 {
75 GX_RECTANGLE *client;
76 INT shift;
77 INT value;
78
79 client = &tree -> gx_window_client;
80
81 if (type & GX_SCROLLBAR_VERTICAL)
82 {
83 info -> gx_scroll_minimum = client -> gx_rectangle_top;
84 info -> gx_scroll_maximum = info -> gx_scroll_minimum + tree -> gx_tree_view_tree_height - 1;
85 info -> gx_scroll_visible = (GX_VALUE)(client -> gx_rectangle_bottom - client -> gx_rectangle_top + 1);
86
87 if (tree -> gx_tree_view_tree_height < info -> gx_scroll_visible)
88 {
89 info -> gx_scroll_maximum = info -> gx_scroll_minimum + info -> gx_scroll_visible - 1;
90 }
91
92 shift = tree -> gx_tree_view_y_shift;
93 value = client -> gx_rectangle_top - shift;
94
95 if (value < info -> gx_scroll_minimum)
96 {
97 value = info -> gx_scroll_minimum;
98 }
99 else if (value > info -> gx_scroll_maximum - info -> gx_scroll_visible + 1)
100 {
101 value = info -> gx_scroll_maximum - info -> gx_scroll_visible + 1;
102 }
103
104 shift = client -> gx_rectangle_top - value;
105
106 if (shift != tree -> gx_tree_view_y_shift)
107 {
108 _gx_tree_view_scroll(tree, 0, (GX_VALUE)(shift - tree->gx_tree_view_y_shift));
109 }
110
111 info -> gx_scroll_value = value;
112 }
113 else
114 {
115 info -> gx_scroll_minimum = client -> gx_rectangle_left;
116 info -> gx_scroll_maximum = info -> gx_scroll_minimum + tree -> gx_tree_view_tree_width - 1;
117 info -> gx_scroll_visible = (GX_VALUE)(client -> gx_rectangle_right - client -> gx_rectangle_left + 1);
118
119 if (tree -> gx_tree_view_tree_width < info -> gx_scroll_visible)
120 {
121 info -> gx_scroll_maximum = info -> gx_scroll_minimum + info -> gx_scroll_visible - 1;
122 }
123
124 shift = tree -> gx_tree_view_x_shift;
125 value = client -> gx_rectangle_left - 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_left - value;
137 if (shift != tree -> gx_tree_view_x_shift)
138 {
139 _gx_tree_view_scroll(tree, (GX_VALUE)(shift - tree->gx_tree_view_x_shift), 0);
140 }
141 info -> gx_scroll_value = value;
142 }
143
144 info -> gx_scroll_increment = (GX_VALUE)(info -> gx_scroll_maximum - info -> gx_scroll_minimum) / 10;
145
146 return(GX_SUCCESS);
147 }
148
149
