InputDispatcher: Only dispatch fallback keys when there's a window
InputDispatcher has an invariant where an input channel must have a
window for dispatcher to be able to target an event to the channel
(i.e. enqueue the event onto the channel's outbound queue - excluding
global monitors).
Fallback key handling logic seems to be the only place where this
invariant does not explicitly hold.
In this CL, we add checks to the fallback logic to uphold this invariant
and ensure the channel has at least one window before generating events
for it.
Bug: 210460522
Test: atest inputflinger_tests
Change-Id: I76ef8b559150a44dc98ea42e52fa92a6b90cde3a
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index ab667d0..8dd98e1 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -7263,7 +7263,7 @@
mWindow->assertNoEvents();
}
-TEST_F(InputDispatcherFallbackKeyTest, WindowRemovedDuringPolicyCall) {
+TEST_F(InputDispatcherFallbackKeyTest, InputChannelRemovedDuringPolicyCall) {
setFallback(AKEYCODE_B);
mDispatcher->notifyKey(
KeyArgsBuilder(ACTION_DOWN, AINPUT_SOURCE_KEYBOARD).keyCode(AKEYCODE_A).build());
@@ -7296,6 +7296,71 @@
ASSERT_NO_FATAL_FAILURE(mFakePolicy->assertUnhandledKeyReported(AKEYCODE_A));
}
+TEST_F(InputDispatcherFallbackKeyTest, WindowRemovedDuringPolicyCall) {
+ setFallback(AKEYCODE_B);
+ mDispatcher->notifyKey(
+ KeyArgsBuilder(ACTION_DOWN, AINPUT_SOURCE_KEYBOARD).keyCode(AKEYCODE_A).build());
+
+ // Do not handle this key event.
+ consumeKey(/*handled=*/false,
+ AllOf(WithKeyAction(ACTION_DOWN), WithKeyCode(AKEYCODE_A), WithFlags(0)));
+ ASSERT_NO_FATAL_FAILURE(mFakePolicy->assertUnhandledKeyReported(AKEYCODE_A));
+ consumeKey(/*handled=*/true,
+ AllOf(WithKeyAction(ACTION_DOWN), WithKeyCode(AKEYCODE_B),
+ WithFlags(AKEY_EVENT_FLAG_FALLBACK)));
+
+ mFakePolicy->setUnhandledKeyHandler([&](const KeyEvent& event) {
+ // When the unhandled key is reported to the policy next, remove the window.
+ mDispatcher->onWindowInfosChanged({{}, {}, 0, 0});
+ return KeyEventBuilder(event).keyCode(AKEYCODE_B).build();
+ });
+ // Release the original key, which the app will not handle. When this unhandled key is reported
+ // to the policy, the window will be removed.
+ mDispatcher->notifyKey(
+ KeyArgsBuilder(ACTION_UP, AINPUT_SOURCE_KEYBOARD).keyCode(AKEYCODE_A).build());
+ consumeKey(/*handled=*/false,
+ AllOf(WithKeyAction(ACTION_UP), WithKeyCode(AKEYCODE_A), WithFlags(0)));
+ ASSERT_NO_FATAL_FAILURE(mFakePolicy->assertUnhandledKeyReported(AKEYCODE_A));
+
+ // Since the window was removed, it loses focus, and the channel state will be reset.
+ consumeKey(/*handled=*/true,
+ AllOf(WithKeyAction(ACTION_UP), WithKeyCode(AKEYCODE_B),
+ WithFlags(AKEY_EVENT_FLAG_FALLBACK | AKEY_EVENT_FLAG_CANCELED)));
+ mWindow->consumeFocusEvent(false);
+ mWindow->assertNoEvents();
+}
+
+TEST_F(InputDispatcherFallbackKeyTest, WindowRemovedWhileAwaitingFinishedSignal) {
+ setFallback(AKEYCODE_B);
+ mDispatcher->notifyKey(
+ KeyArgsBuilder(ACTION_DOWN, AINPUT_SOURCE_KEYBOARD).keyCode(AKEYCODE_A).build());
+
+ // Do not handle this key event.
+ consumeKey(/*handled=*/false,
+ AllOf(WithKeyAction(ACTION_DOWN), WithKeyCode(AKEYCODE_A), WithFlags(0)));
+ ASSERT_NO_FATAL_FAILURE(mFakePolicy->assertUnhandledKeyReported(AKEYCODE_A));
+ const auto [seq, event] = mWindow->receiveEvent();
+ ASSERT_TRUE(seq.has_value() && event != nullptr) << "Failed to receive fallback event";
+ ASSERT_EQ(event->getType(), InputEventType::KEY);
+ ASSERT_THAT(static_cast<const KeyEvent&>(*event),
+ AllOf(WithKeyAction(ACTION_DOWN), WithKeyCode(AKEYCODE_B),
+ WithFlags(AKEY_EVENT_FLAG_FALLBACK)));
+
+ // Remove the window now, which should generate a cancellations and make the window lose focus.
+ mDispatcher->onWindowInfosChanged({{}, {}, 0, 0});
+ consumeKey(/*handled=*/true,
+ AllOf(WithKeyAction(ACTION_UP), WithKeyCode(AKEYCODE_A),
+ WithFlags(AKEY_EVENT_FLAG_CANCELED)));
+ consumeKey(/*handled=*/true,
+ AllOf(WithKeyAction(ACTION_UP), WithKeyCode(AKEYCODE_B),
+ WithFlags(AKEY_EVENT_FLAG_FALLBACK | AKEY_EVENT_FLAG_CANCELED)));
+ mWindow->consumeFocusEvent(false);
+
+ // Finish the event by reporting it as handled.
+ mWindow->finishEvent(*seq);
+ mWindow->assertNoEvents();
+}
+
class InputDispatcherKeyRepeatTest : public InputDispatcherTest {
protected:
static constexpr std::chrono::nanoseconds KEY_REPEAT_TIMEOUT = 40ms;