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 /**   Widget Management (Widget)                                          */
19 /**                                                                       */
20 /**************************************************************************/
21 
22 #define GX_SOURCE_CODE
23 
24 
25 /* Include necessary system files.  */
26 
27 #include "gx_api.h"
28 #include "gx_system.h"
29 #include "gx_canvas.h"
30 #include "gx_utility.h"
31 #include "gx_widget.h"
32 
33 
34 /**************************************************************************/
35 /*                                                                        */
36 /*  FUNCTION                                               RELEASE        */
37 /*                                                                        */
38 /*    _gx_widget_child_clipping_update                    PORTABLE C      */
39 /*                                                           6.1          */
40 /*  AUTHOR                                                                */
41 /*                                                                        */
42 /*    Kenneth Maxwell, Microsoft Corporation                              */
43 /*                                                                        */
44 /*  DESCRIPTION                                                           */
45 /*                                                                        */
46 /*    Update the clipping members of each child widget to prevent them    */
47 /*    from drawing outside their parent's area.                           */
48 /*                                                                        */
49 /*  INPUT                                                                 */
50 /*                                                                        */
51 /*    parent                                Pointer to parent widget      */
52 /*                                                                        */
53 /*  OUTPUT                                                                */
54 /*                                                                        */
55 /*    None                                                                */
56 /*                                                                        */
57 /*  CALLS                                                                 */
58 /*                                                                        */
59 /*    _gx_utility_rectangle_overlap_detect  Detect overlapping widgets    */
60 /*    _gx_widget_child_clipping_update      Updating child clipping area  */
61 /*                                                                        */
62 /*  CALLED BY                                                             */
63 /*                                                                        */
64 /*    GUIX Internal Code                                                  */
65 /*    GUIX application code                                               */
66 /*                                                                        */
67 /*  RELEASE HISTORY                                                       */
68 /*                                                                        */
69 /*    DATE              NAME                      DESCRIPTION             */
70 /*                                                                        */
71 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
72 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
73 /*                                            resulting in version 6.1    */
74 /*                                                                        */
75 /**************************************************************************/
_gx_widget_child_clipping_update(GX_WIDGET * parent)76 VOID  _gx_widget_child_clipping_update(GX_WIDGET *parent)
77 {
78 GX_WIDGET *child;
79 GX_WIDGET *win;
80 
81     child = parent -> gx_widget_first_child;
82 
83     while (child)
84     {
85         win = child -> gx_widget_parent;
86         _gx_utility_rectangle_overlap_detect(&win -> gx_widget_clip,
87                                              &child -> gx_widget_size, &child -> gx_widget_clip);
88 
89         if (win -> gx_widget_type >= GX_TYPE_WINDOW &&
90             !(child -> gx_widget_status & GX_STATUS_NONCLIENT))
91         {
92             _gx_utility_rectangle_overlap_detect(&((GX_WINDOW *)win) -> gx_window_client,
93                                                  &child -> gx_widget_clip, &child -> gx_widget_clip);
94         }
95 
96         if (child -> gx_widget_first_child)
97         {
98             child = child -> gx_widget_first_child;
99             continue;
100         }
101 
102         while ((child -> gx_widget_next == GX_NULL) && (child != parent))
103         {
104             child = child -> gx_widget_parent;
105         }
106 
107         if (child == parent)
108         {
109             break;
110         }
111 
112         child = child -> gx_widget_next;
113     }
114 }
115 
116