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 /**   Widget Management (Widget)                                          */
18 /**                                                                       */
19 /**************************************************************************/
20 
21 #define GX_SOURCE_CODE
22 
23 
24 /* Include necessary system files.  */
25 
26 #include "gx_api.h"
27 #include "gx_system.h"
28 #include "gx_canvas.h"
29 #include "gx_utility.h"
30 #include "gx_widget.h"
31 
32 
33 /**************************************************************************/
34 /*                                                                        */
35 /*  FUNCTION                                               RELEASE        */
36 /*                                                                        */
37 /*    _gx_widget_child_clipping_update                    PORTABLE C      */
38 /*                                                           6.1          */
39 /*  AUTHOR                                                                */
40 /*                                                                        */
41 /*    Kenneth Maxwell, Microsoft Corporation                              */
42 /*                                                                        */
43 /*  DESCRIPTION                                                           */
44 /*                                                                        */
45 /*    Update the clipping members of each child widget to prevent them    */
46 /*    from drawing outside their parent's area.                           */
47 /*                                                                        */
48 /*  INPUT                                                                 */
49 /*                                                                        */
50 /*    parent                                Pointer to parent widget      */
51 /*                                                                        */
52 /*  OUTPUT                                                                */
53 /*                                                                        */
54 /*    None                                                                */
55 /*                                                                        */
56 /*  CALLS                                                                 */
57 /*                                                                        */
58 /*    _gx_utility_rectangle_overlap_detect  Detect overlapping widgets    */
59 /*    _gx_widget_child_clipping_update      Updating child clipping area  */
60 /*                                                                        */
61 /*  CALLED BY                                                             */
62 /*                                                                        */
63 /*    GUIX Internal Code                                                  */
64 /*    GUIX application code                                               */
65 /*                                                                        */
66 /*  RELEASE HISTORY                                                       */
67 /*                                                                        */
68 /*    DATE              NAME                      DESCRIPTION             */
69 /*                                                                        */
70 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
71 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
72 /*                                            resulting in version 6.1    */
73 /*                                                                        */
74 /**************************************************************************/
_gx_widget_child_clipping_update(GX_WIDGET * parent)75 VOID  _gx_widget_child_clipping_update(GX_WIDGET *parent)
76 {
77 GX_WIDGET *child;
78 GX_WIDGET *win;
79 
80     child = parent -> gx_widget_first_child;
81 
82     while (child)
83     {
84         win = child -> gx_widget_parent;
85         _gx_utility_rectangle_overlap_detect(&win -> gx_widget_clip,
86                                              &child -> gx_widget_size, &child -> gx_widget_clip);
87 
88         if (win -> gx_widget_type >= GX_TYPE_WINDOW &&
89             !(child -> gx_widget_status & GX_STATUS_NONCLIENT))
90         {
91             _gx_utility_rectangle_overlap_detect(&((GX_WINDOW *)win) -> gx_window_client,
92                                                  &child -> gx_widget_clip, &child -> gx_widget_clip);
93         }
94 
95         if (child -> gx_widget_first_child)
96         {
97             child = child -> gx_widget_first_child;
98             continue;
99         }
100 
101         while ((child -> gx_widget_next == GX_NULL) && (child != parent))
102         {
103             child = child -> gx_widget_parent;
104         }
105 
106         if (child == parent)
107         {
108             break;
109         }
110 
111         child = child -> gx_widget_next;
112     }
113 }
114 
115