1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "ui/events/event_target.h"
6
7 #include <algorithm>
8
9 #include "base/logging.h"
10 #include "ui/events/event.h"
11
12 namespace ui {
13
EventTarget()14 EventTarget::EventTarget()
15 : target_handler_(NULL) {
16 }
17
~EventTarget()18 EventTarget::~EventTarget() {
19 }
20
ConvertEventToTarget(EventTarget * target,LocatedEvent * event)21 void EventTarget::ConvertEventToTarget(EventTarget* target,
22 LocatedEvent* event) {
23 }
24
AddPreTargetHandler(EventHandler * handler)25 void EventTarget::AddPreTargetHandler(EventHandler* handler) {
26 pre_target_list_.push_back(handler);
27 }
28
PrependPreTargetHandler(EventHandler * handler)29 void EventTarget::PrependPreTargetHandler(EventHandler* handler) {
30 pre_target_list_.insert(pre_target_list_.begin(), handler);
31 }
32
RemovePreTargetHandler(EventHandler * handler)33 void EventTarget::RemovePreTargetHandler(EventHandler* handler) {
34 EventHandlerList::iterator find =
35 std::find(pre_target_list_.begin(),
36 pre_target_list_.end(),
37 handler);
38 if (find != pre_target_list_.end())
39 pre_target_list_.erase(find);
40 }
41
AddPostTargetHandler(EventHandler * handler)42 void EventTarget::AddPostTargetHandler(EventHandler* handler) {
43 post_target_list_.push_back(handler);
44 }
45
RemovePostTargetHandler(EventHandler * handler)46 void EventTarget::RemovePostTargetHandler(EventHandler* handler) {
47 EventHandlerList::iterator find =
48 std::find(post_target_list_.begin(),
49 post_target_list_.end(),
50 handler);
51 if (find != post_target_list_.end())
52 post_target_list_.erase(find);
53 }
54
IsPreTargetListEmpty() const55 bool EventTarget::IsPreTargetListEmpty() const {
56 return pre_target_list_.empty();
57 }
58
OnEvent(Event * event)59 void EventTarget::OnEvent(Event* event) {
60 CHECK_EQ(this, event->target());
61 if (target_handler_)
62 target_handler_->OnEvent(event);
63 else
64 EventHandler::OnEvent(event);
65 }
66
OnKeyEvent(KeyEvent * event)67 void EventTarget::OnKeyEvent(KeyEvent* event) {
68 CHECK_EQ(this, event->target());
69 if (target_handler_)
70 target_handler_->OnKeyEvent(event);
71 }
72
OnMouseEvent(MouseEvent * event)73 void EventTarget::OnMouseEvent(MouseEvent* event) {
74 CHECK_EQ(this, event->target());
75 if (target_handler_)
76 target_handler_->OnMouseEvent(event);
77 }
78
OnScrollEvent(ScrollEvent * event)79 void EventTarget::OnScrollEvent(ScrollEvent* event) {
80 CHECK_EQ(this, event->target());
81 if (target_handler_)
82 target_handler_->OnScrollEvent(event);
83 }
84
OnTouchEvent(TouchEvent * event)85 void EventTarget::OnTouchEvent(TouchEvent* event) {
86 CHECK_EQ(this, event->target());
87 if (target_handler_)
88 target_handler_->OnTouchEvent(event);
89 }
90
OnGestureEvent(GestureEvent * event)91 void EventTarget::OnGestureEvent(GestureEvent* event) {
92 CHECK_EQ(this, event->target());
93 if (target_handler_)
94 target_handler_->OnGestureEvent(event);
95 }
96
GetPreTargetHandlers(EventHandlerList * list)97 void EventTarget::GetPreTargetHandlers(EventHandlerList* list) {
98 EventTarget* target = this;
99 while (target) {
100 EventHandlerList::reverse_iterator it, rend;
101 for (it = target->pre_target_list_.rbegin(),
102 rend = target->pre_target_list_.rend();
103 it != rend;
104 ++it) {
105 list->insert(list->begin(), *it);
106 }
107 target = target->GetParentTarget();
108 }
109 }
110
GetPostTargetHandlers(EventHandlerList * list)111 void EventTarget::GetPostTargetHandlers(EventHandlerList* list) {
112 EventTarget* target = this;
113 while (target) {
114 for (EventHandlerList::iterator it = target->post_target_list_.begin(),
115 end = target->post_target_list_.end(); it != end; ++it) {
116 list->push_back(*it);
117 }
118 target = target->GetParentTarget();
119 }
120 }
121
122 } // namespace ui
123