Updating trunk VERSION from 2139.0 to 2140.0
[chromium-blink-merge.git] / ui / events / event_rewriter_unittest.cc
blob11a05c9c1572df48b385276d4ea8e4fd623a8283
1 // Copyright 2014 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.
5 #include "ui/events/event_rewriter.h"
7 #include <list>
8 #include <map>
9 #include <set>
10 #include <utility>
12 #include "testing/gtest/include/gtest/gtest.h"
13 #include "ui/events/test/test_event_processor.h"
15 namespace ui {
17 namespace {
19 // To test the handling of |EventRewriter|s through |EventSource|,
20 // we rewrite and test event types.
21 class TestEvent : public Event {
22 public:
23 explicit TestEvent(EventType type)
24 : Event(type, base::TimeDelta(), 0), unique_id_(next_unique_id_++) {}
25 virtual ~TestEvent() {}
26 int unique_id() const { return unique_id_; }
28 private:
29 static int next_unique_id_;
30 int unique_id_;
33 int TestEvent::next_unique_id_ = 0;
35 // TestEventRewriteProcessor is set up with a sequence of event types,
36 // and fails if the events received via OnEventFromSource() do not match
37 // this sequence. These expected event types are consumed on receipt.
38 class TestEventRewriteProcessor : public test::TestEventProcessor {
39 public:
40 TestEventRewriteProcessor() {}
41 virtual ~TestEventRewriteProcessor() { CheckAllReceived(); }
43 void AddExpectedEvent(EventType type) { expected_events_.push_back(type); }
44 // Test that all expected events have been received.
45 void CheckAllReceived() { EXPECT_TRUE(expected_events_.empty()); }
47 // EventProcessor:
48 virtual EventDispatchDetails OnEventFromSource(Event* event) OVERRIDE {
49 EXPECT_FALSE(expected_events_.empty());
50 EXPECT_EQ(expected_events_.front(), event->type());
51 expected_events_.pop_front();
52 return EventDispatchDetails();
55 private:
56 std::list<EventType> expected_events_;
57 DISALLOW_COPY_AND_ASSIGN(TestEventRewriteProcessor);
60 // Trivial EventSource that does nothing but send events.
61 class TestEventRewriteSource : public EventSource {
62 public:
63 explicit TestEventRewriteSource(EventProcessor* processor)
64 : processor_(processor) {}
65 virtual EventProcessor* GetEventProcessor() OVERRIDE { return processor_; }
66 void Send(EventType type) {
67 scoped_ptr<Event> event(new TestEvent(type));
68 (void)SendEventToProcessor(event.get());
71 private:
72 EventProcessor* processor_;
75 // This EventRewriter always returns the same status, and if rewriting, the
76 // same event type; it is used to test simple rewriting, and rewriter addition,
77 // removal, and sequencing. Consequently EVENT_REWRITE_DISPATCH_ANOTHER is not
78 // supported here (calls to NextDispatchEvent() would continue indefinitely).
79 class TestConstantEventRewriter : public EventRewriter {
80 public:
81 TestConstantEventRewriter(EventRewriteStatus status, EventType type)
82 : status_(status), type_(type) {
83 CHECK_NE(EVENT_REWRITE_DISPATCH_ANOTHER, status);
86 virtual EventRewriteStatus RewriteEvent(const Event& event,
87 scoped_ptr<Event>* rewritten_event)
88 OVERRIDE {
89 if (status_ == EVENT_REWRITE_REWRITTEN)
90 rewritten_event->reset(new TestEvent(type_));
91 return status_;
93 virtual EventRewriteStatus NextDispatchEvent(const Event& last_event,
94 scoped_ptr<Event>* new_event)
95 OVERRIDE {
96 NOTREACHED();
97 return status_;
100 private:
101 EventRewriteStatus status_;
102 EventType type_;
105 // This EventRewriter runs a simple state machine; it is used to test
106 // EVENT_REWRITE_DISPATCH_ANOTHER.
107 class TestStateMachineEventRewriter : public EventRewriter {
108 public:
109 TestStateMachineEventRewriter() : last_rewritten_event_(0), state_(0) {}
110 void AddRule(int from_state, EventType from_type,
111 int to_state, EventType to_type, EventRewriteStatus to_status) {
112 RewriteResult r = {to_state, to_type, to_status};
113 rules_.insert(std::pair<RewriteCase, RewriteResult>(
114 RewriteCase(from_state, from_type), r));
116 virtual EventRewriteStatus RewriteEvent(const Event& event,
117 scoped_ptr<Event>* rewritten_event)
118 OVERRIDE {
119 RewriteRules::iterator find =
120 rules_.find(RewriteCase(state_, event.type()));
121 if (find == rules_.end())
122 return EVENT_REWRITE_CONTINUE;
123 if ((find->second.status == EVENT_REWRITE_REWRITTEN) ||
124 (find->second.status == EVENT_REWRITE_DISPATCH_ANOTHER)) {
125 last_rewritten_event_ = new TestEvent(find->second.type);
126 rewritten_event->reset(last_rewritten_event_);
127 } else {
128 last_rewritten_event_ = 0;
130 state_ = find->second.state;
131 return find->second.status;
133 virtual EventRewriteStatus NextDispatchEvent(const Event& last_event,
134 scoped_ptr<Event>* new_event)
135 OVERRIDE {
136 EXPECT_TRUE(last_rewritten_event_);
137 const TestEvent* arg_last = static_cast<const TestEvent*>(&last_event);
138 EXPECT_EQ(last_rewritten_event_->unique_id(), arg_last->unique_id());
139 const TestEvent* arg_new = static_cast<const TestEvent*>(new_event->get());
140 EXPECT_FALSE(arg_new && arg_last->unique_id() == arg_new->unique_id());
141 return RewriteEvent(last_event, new_event);
144 private:
145 typedef std::pair<int, EventType> RewriteCase;
146 struct RewriteResult {
147 int state;
148 EventType type;
149 EventRewriteStatus status;
151 typedef std::map<RewriteCase, RewriteResult> RewriteRules;
152 RewriteRules rules_;
153 TestEvent* last_rewritten_event_;
154 int state_;
157 } // namespace
159 TEST(EventRewriterTest, EventRewriting) {
160 // TestEventRewriter r0 always rewrites events to ET_CANCEL_MODE;
161 // it is placed at the beginning of the chain and later removed,
162 // to verify that rewriter removal works.
163 TestConstantEventRewriter r0(EVENT_REWRITE_REWRITTEN, ET_CANCEL_MODE);
165 // TestEventRewriter r1 always returns EVENT_REWRITE_CONTINUE;
166 // it is placed at the beginning of the chain to verify that a
167 // later rewriter sees the events.
168 TestConstantEventRewriter r1(EVENT_REWRITE_CONTINUE, ET_UNKNOWN);
170 // TestEventRewriter r2 has a state machine, primarily to test
171 // |EVENT_REWRITE_DISPATCH_ANOTHER|.
172 TestStateMachineEventRewriter r2;
174 // TestEventRewriter r3 always rewrites events to ET_CANCEL_MODE;
175 // it is placed at the end of the chain to verify that previously
176 // rewritten events are not passed further down the chain.
177 TestConstantEventRewriter r3(EVENT_REWRITE_REWRITTEN, ET_CANCEL_MODE);
179 TestEventRewriteProcessor p;
180 TestEventRewriteSource s(&p);
181 s.AddEventRewriter(&r0);
182 s.AddEventRewriter(&r1);
183 s.AddEventRewriter(&r2);
185 // These events should be rewritten by r0 to ET_CANCEL_MODE.
186 p.AddExpectedEvent(ET_CANCEL_MODE);
187 s.Send(ET_MOUSE_DRAGGED);
188 p.AddExpectedEvent(ET_CANCEL_MODE);
189 s.Send(ET_MOUSE_PRESSED);
190 p.CheckAllReceived();
192 // Remove r0, and verify that it's gone and that events make it through.
193 s.AddEventRewriter(&r3);
194 s.RemoveEventRewriter(&r0);
195 r2.AddRule(0, ET_SCROLL_FLING_START,
196 0, ET_SCROLL_FLING_CANCEL, EVENT_REWRITE_REWRITTEN);
197 p.AddExpectedEvent(ET_SCROLL_FLING_CANCEL);
198 s.Send(ET_SCROLL_FLING_START);
199 p.CheckAllReceived();
200 s.RemoveEventRewriter(&r3);
202 // Verify EVENT_REWRITE_DISPATCH_ANOTHER using a state machine
203 // (that happens to be analogous to sticky keys).
204 r2.AddRule(0, ET_KEY_PRESSED,
205 1, ET_KEY_PRESSED, EVENT_REWRITE_CONTINUE);
206 r2.AddRule(1, ET_MOUSE_PRESSED,
207 0, ET_MOUSE_PRESSED, EVENT_REWRITE_CONTINUE);
208 r2.AddRule(1, ET_KEY_RELEASED,
209 2, ET_KEY_RELEASED, EVENT_REWRITE_DISCARD);
210 r2.AddRule(2, ET_MOUSE_RELEASED,
211 3, ET_MOUSE_RELEASED, EVENT_REWRITE_DISPATCH_ANOTHER);
212 r2.AddRule(3, ET_MOUSE_RELEASED,
213 0, ET_KEY_RELEASED, EVENT_REWRITE_REWRITTEN);
214 p.AddExpectedEvent(ET_KEY_PRESSED);
215 s.Send(ET_KEY_PRESSED);
216 s.Send(ET_KEY_RELEASED);
217 p.AddExpectedEvent(ET_MOUSE_PRESSED);
218 s.Send(ET_MOUSE_PRESSED);
220 // Removing rewriters r1 and r3 shouldn't affect r2.
221 s.RemoveEventRewriter(&r1);
222 s.RemoveEventRewriter(&r3);
224 // Continue with the state-based rewriting.
225 p.AddExpectedEvent(ET_MOUSE_RELEASED);
226 p.AddExpectedEvent(ET_KEY_RELEASED);
227 s.Send(ET_MOUSE_RELEASED);
228 p.CheckAllReceived();
231 } // namespace ui