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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/events/event_target.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/events/test/events_test_utils.h"
#include "ui/events/test/test_event_handler.h"
#include "ui/events/test/test_event_processor.h"
#include "ui/events/test/test_event_target.h"
namespace ui {
namespace {
TEST(EventTargetTest, AddsAndRemovesHandlers) {
test::TestEventTarget target;
EventTargetTestApi test_api(&target);
test::TestEventHandler handler;
EventHandlerList list;
// Try at the default priority
target.AddPreTargetHandler(&handler);
list = test_api.GetPreTargetHandlers();
ASSERT_EQ(1u, list.size());
target.RemovePreTargetHandler(&handler);
list = test_api.GetPreTargetHandlers();
ASSERT_EQ(0u, list.size());
// Try at a different priority
target.AddPreTargetHandler(&handler, EventTarget::Priority::kAccessibility);
list = test_api.GetPreTargetHandlers();
ASSERT_EQ(1u, list.size());
target.RemovePreTargetHandler(&handler);
list = test_api.GetPreTargetHandlers();
ASSERT_EQ(0u, list.size());
// Doesn't crash if we remove a handler that doesn't exist.
target.RemovePreTargetHandler(&handler);
}
TEST(EventTargetTest, HandlerOrdering) {
test::TestEventTarget target;
EventTargetTestApi test_api(&target);
test::TestEventHandler default_handler;
test::TestEventHandler system_handler;
test::TestEventHandler a11y_handler;
EventHandlerList list;
// Try adding default then system then a11y, which is backwards of the
// desired order.
target.AddPreTargetHandler(&default_handler, EventTarget::Priority::kDefault);
target.AddPreTargetHandler(&system_handler, EventTarget::Priority::kSystem);
target.AddPreTargetHandler(&a11y_handler,
EventTarget::Priority::kAccessibility);
list = test_api.GetPreTargetHandlers();
ASSERT_EQ(3u, list.size());
EXPECT_EQ(list[0], &a11y_handler);
EXPECT_EQ(list[1], &system_handler);
EXPECT_EQ(list[2], &default_handler);
target.RemovePreTargetHandler(&default_handler);
target.RemovePreTargetHandler(&system_handler);
target.RemovePreTargetHandler(&a11y_handler);
}
TEST(EventTargetTest, HandlerOrderingComplex) {
test::TestEventTarget target;
EventTargetTestApi test_api(&target);
test::TestEventHandler default_handler_1;
test::TestEventHandler default_handler_2;
test::TestEventHandler system_handler_1;
test::TestEventHandler system_handler_2;
test::TestEventHandler system_handler_3;
test::TestEventHandler a11y_handler_1;
test::TestEventHandler a11y_handler_2;
EventHandlerList list;
// Adding a new system or accessibility handler will insert it before others
// of its type. Adding a new default handler puts it at the end of the list,
// for historical reasons. Re-arranging default handlers causes test failures
// in many unittests and may also cause real-life bugs, so for now default
// still is at the end of the list.
target.AddPreTargetHandler(&system_handler_3, EventTarget::Priority::kSystem);
target.AddPreTargetHandler(&default_handler_1,
EventTarget::Priority::kDefault);
target.AddPreTargetHandler(&system_handler_2, EventTarget::Priority::kSystem);
target.AddPreTargetHandler(&a11y_handler_2,
EventTarget::Priority::kAccessibility);
target.AddPreTargetHandler(&system_handler_1, EventTarget::Priority::kSystem);
target.AddPreTargetHandler(&default_handler_2,
EventTarget::Priority::kDefault);
target.AddPreTargetHandler(&a11y_handler_1,
EventTarget::Priority::kAccessibility);
list = test_api.GetPreTargetHandlers();
ASSERT_EQ(7u, list.size());
EXPECT_EQ(list[0], &a11y_handler_1);
EXPECT_EQ(list[1], &a11y_handler_2);
EXPECT_EQ(list[2], &system_handler_1);
EXPECT_EQ(list[3], &system_handler_2);
EXPECT_EQ(list[4], &system_handler_3);
EXPECT_EQ(list[5], &default_handler_1);
EXPECT_EQ(list[6], &default_handler_2);
target.RemovePreTargetHandler(&system_handler_3);
target.RemovePreTargetHandler(&default_handler_1);
target.RemovePreTargetHandler(&system_handler_2);
target.RemovePreTargetHandler(&a11y_handler_2);
target.RemovePreTargetHandler(&system_handler_1);
target.RemovePreTargetHandler(&default_handler_2);
target.RemovePreTargetHandler(&a11y_handler_1);
}
TEST(EventTargetTest, HandlerOrderingAcrossEventTargets) {
// Child needs to be a unique pointer so that TestEventTarget::AddChild works.
std::unique_ptr<test::TestEventTarget> child =
std::make_unique<test::TestEventTarget>();
test::TestEventTarget parent;
test::TestEventHandler default_handler_1;
test::TestEventHandler default_handler_2;
test::TestEventHandler default_handler_3;
test::TestEventHandler system_handler_1;
test::TestEventHandler system_handler_2;
test::TestEventHandler system_handler_3;
test::TestEventHandler a11y_handler_1;
test::TestEventHandler a11y_handler_2;
test::TestEventHandler a11y_handler_3;
// Parent handlers should be called before children handlers.
parent.AddPreTargetHandler(&default_handler_1,
EventTarget::Priority::kDefault);
parent.AddPreTargetHandler(&system_handler_2, EventTarget::Priority::kSystem);
parent.AddPreTargetHandler(&a11y_handler_2,
EventTarget::Priority::kAccessibility);
child->AddPreTargetHandler(&default_handler_3,
EventTarget::Priority::kDefault);
child->AddPreTargetHandler(&a11y_handler_3,
EventTarget::Priority::kAccessibility);
child->AddPreTargetHandler(&system_handler_3, EventTarget::Priority::kSystem);
parent.AddPreTargetHandler(&system_handler_1, EventTarget::Priority::kSystem);
parent.AddPreTargetHandler(&default_handler_2,
EventTarget::Priority::kDefault);
parent.AddPreTargetHandler(&a11y_handler_1,
EventTarget::Priority::kAccessibility);
// Connect the parent and child in a EventTargetTestAPI.
EventTargetTestApi test_api(child.get());
test::TestEventTarget* child_ptr = child.get();
parent.AddChild(std::move(child));
EventHandlerList list;
list = test_api.GetPreTargetHandlers();
ASSERT_EQ(9u, list.size());
// Parent handlers are called before child handlers, so a11y_handler_1 and
// 2 should be called before a11y_handler3, and similarly all the system and
// default handlers added to the parent should be called before those added
// to the child.
// In addition, all a11y handlers should be called before all system handlers,
// which should be called before all default handlers.
EXPECT_EQ(list[0], &a11y_handler_1);
EXPECT_EQ(list[1], &a11y_handler_2);
EXPECT_EQ(list[2], &a11y_handler_3);
EXPECT_EQ(list[3], &system_handler_1);
EXPECT_EQ(list[4], &system_handler_2);
EXPECT_EQ(list[5], &system_handler_3);
EXPECT_EQ(list[6], &default_handler_1);
EXPECT_EQ(list[7], &default_handler_2);
EXPECT_EQ(list[8], &default_handler_3);
parent.RemovePreTargetHandler(&default_handler_1);
parent.RemovePreTargetHandler(&system_handler_2);
parent.RemovePreTargetHandler(&a11y_handler_2);
child_ptr->RemovePreTargetHandler(&default_handler_3);
child_ptr->RemovePreTargetHandler(&a11y_handler_3);
child_ptr->RemovePreTargetHandler(&system_handler_3);
parent.RemovePreTargetHandler(&system_handler_1);
parent.RemovePreTargetHandler(&default_handler_2);
parent.RemovePreTargetHandler(&a11y_handler_1);
}
} // namespace
} // namespace ui
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