Dali 3D User Interface Engine
trigger-event.cpp
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1 /*
2  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 
18 // CLASS HEADER
19 #include "trigger-event.h"
20 
21 // EXTERNAL INCLUDES
22 #include <sys/eventfd.h>
23 #include <unistd.h>
24 
26 
27 // INTERNAL INCLUDES
28 
30 
31 namespace Dali
32 {
33 
34 namespace Internal
35 {
36 
37 namespace Adaptor
38 {
39 
40 TriggerEvent::TriggerEvent( CallbackBase* callback, TriggerEventInterface::Options options )
41 : mFileDescriptorMonitor( NULL ),
42  mCallback( callback ),
43  mFileDescriptor( -1 ),
44  mOptions( options )
45 {
46  // Create accompanying file descriptor.
47  mFileDescriptor = eventfd(0, EFD_NONBLOCK);
48  if (mFileDescriptor >= 0)
49  {
50  // Now Monitor the created event file descriptor
52  }
53  else
54  {
55  DALI_LOG_ERROR("Unable to create TriggerEvent File descriptor\n");
56  }
57 }
58 
60 {
62  delete mCallback;
63 
64  if (mFileDescriptor >= 0)
65  {
66  close(mFileDescriptor);
67  mFileDescriptor = 0;
68  }
69 }
70 
72 {
73  if (mFileDescriptor >= 0)
74  {
75  // Increment event counter by 1.
76  // Writing to the file descriptor triggers the Dispatch() method in the other thread
77  // (if in multi-threaded environment).
78 
79  uint64_t data = 1;
80  int size = write(mFileDescriptor, &data, sizeof(uint64_t));
81 
82  if (size != sizeof(uint64_t))
83  {
84  DALI_LOG_ERROR("Unable to write to UpdateEvent File descriptor\n");
85  }
86  }
87  else
88  {
89  DALI_LOG_WARNING("Attempting to write to an invalid file descriptor\n");
90  }
91 }
92 
94 {
95  if( !( eventBitMask & FileDescriptorMonitor::FD_READABLE ) )
96  {
97  DALI_ASSERT_ALWAYS( 0 && "Trigger event file descriptor error");
98  return;
99  }
100 
101  // Reading from the file descriptor resets the event counter, we can ignore the count.
102  uint64_t receivedData;
103  size_t size;
104  size = read(mFileDescriptor, &receivedData, sizeof(uint64_t));
105  if (size != sizeof(uint64_t))
106  {
107  DALI_LOG_WARNING("Unable to read to UpdateEvent File descriptor\n");
108  }
109 
110  // Call the connected callback
112 
113  //check if we should delete ourselves after the trigger
114  if( mOptions == TriggerEventInterface::DELETE_AFTER_TRIGGER )
115  {
116  delete this;
117  }
118 }
119 
120 } // namespace Adaptor
121 
122 } // namespace Internal
123 
124 } // namespace Dali
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