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 /**   System Management (System)                                          */
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_widget.h"
30 
31 /**************************************************************************/
32 /*                                                                        */
33 /*  FUNCTION                                               RELEASE        */
34 /*                                                                        */
35 /*    _gx_system_screen_stack_pop                         PORTABLE C      */
36 /*                                                           6.1          */
37 /*  AUTHOR                                                                */
38 /*                                                                        */
39 /*    Kenneth Maxwell, Microsoft Corporation                              */
40 /*                                                                        */
41 /*  DESCRIPTION                                                           */
42 /*                                                                        */
43 /*    This function removes the topmost entry from the system screen      */
44 /*    stack, and attaches the poped screen to its parent.                 */
45 /*                                                                        */
46 /*  INPUT                                                                 */
47 /*                                                                        */
48 /*    control                               Pointer of stack entry.       */
49 /*                                                                        */
50 /*  OUTPUT                                                                */
51 /*                                                                        */
52 /*    status                                Completion status             */
53 /*                                                                        */
54 /*  CALLS                                                                 */
55 /*                                                                        */
56 /*    None                                                                */
57 /*                                                                        */
58 /*  CALLED BY                                                             */
59 /*                                                                        */
60 /*    Application Code                                                    */
61 /*                                                                        */
62 /*  RELEASE HISTORY                                                       */
63 /*                                                                        */
64 /*    DATE              NAME                      DESCRIPTION             */
65 /*                                                                        */
66 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
67 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
68 /*                                            resulting in version 6.1    */
69 /*                                                                        */
70 /**************************************************************************/
_gx_system_screen_stack_pop(VOID)71 UINT  _gx_system_screen_stack_pop(VOID)
72 {
73 INT        top;
74 GX_WIDGET *screen;
75 GX_WIDGET *parent;
76 
77     top = _gx_system_screen_stack.gx_screen_stack_control_top;
78 
79     if (top >= 0)
80     {
81         top <<= 1;
82         screen = _gx_system_screen_stack.gx_screen_stack_control_memory[top];
83         parent = _gx_system_screen_stack.gx_screen_stack_control_memory[top + 1];
84 
85         if (parent)
86         {
87             /* Attach the popped screen to its parent. */
88             _gx_widget_attach(parent, screen);
89         }
90 
91         _gx_system_screen_stack.gx_screen_stack_control_top--;
92 
93         return(GX_SUCCESS);
94     }
95     else
96     {
97         return(GX_FAILURE);
98     }
99 }
100 
101