Request focus using setFocusedWindow

Switch from using setInputWindow to setFocusedWindow to set the focused
window for a display. setInputWindows will still handle window state
changes such as visibility and focusability which can take focus away
from the currently focused window.

This change explicitly defines how mirrored window or windows sharing a
window token handles focus. For a window to be focusable, all the
windows sharing its window token must be focusable and at least one of
the window must be visible. This different from the previous behaviour
where z-order and the state of a single window determined focus via
setInputWindows.

In addition, if focus is requested on an invisible window, the request
is queued up until the window becomes focus or a new request is made.
Any key events are queued and delivered to the new window as it becomes
focused. This allows the system to deliver any key events to the new
window between the time that the system wants to show a new window and
the window is ready to receive input.

Test: atest inputflinger_tests
Test: atest CtsWindowManagerDeviceTestCases
Test: atest FlickerTests

Change-Id: Id09cce42f55fb7d36a3eb0aa9d28f6a44bd1cf07
diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index 3b0b392..130413d 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -493,6 +493,14 @@
     return changes;
 }
 
+bool InputWindowCommands::empty() const {
+    bool empty = true;
+#ifndef NO_INPUT
+    empty = focusRequests.empty() && !syncInputWindows;
+#endif
+    return empty;
+}
+
 void InputWindowCommands::clear() {
 #ifndef NO_INPUT
     focusRequests.clear();
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 65a1a01..ce2e5ed 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -1365,11 +1365,13 @@
 }
 
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setFocusedWindow(
-        const sp<IBinder>& token, const sp<IBinder>& focusedToken, nsecs_t timestampNanos) {
+        const sp<IBinder>& token, const sp<IBinder>& focusedToken, nsecs_t timestampNanos,
+        int32_t displayId) {
     FocusRequest request;
     request.token = token;
     request.focusedToken = focusedToken;
     request.timestamp = timestampNanos;
+    request.displayId = displayId;
     return setFocusedWindow(request);
 }
 
diff --git a/libs/gui/include/gui/LayerState.h b/libs/gui/include/gui/LayerState.h
index 47d62fe..cf63826 100644
--- a/libs/gui/include/gui/LayerState.h
+++ b/libs/gui/include/gui/LayerState.h
@@ -311,6 +311,7 @@
 
     // Merges the passed in commands and returns true if there were any changes.
     bool merge(const InputWindowCommands& other);
+    bool empty() const;
     void clear();
     status_t write(Parcel& output) const;
     status_t read(const Parcel& input);
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index 05151ba..af37468 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -509,7 +509,7 @@
 #ifndef NO_INPUT
         Transaction& setInputWindowInfo(const sp<SurfaceControl>& sc, const InputWindowInfo& info);
         Transaction& setFocusedWindow(const sp<IBinder>& token, const sp<IBinder>& focusedToken,
-                                      nsecs_t timestampNanos);
+                                      nsecs_t timestampNanos, int32_t displayId);
         Transaction& setFocusedWindow(const FocusRequest& request);
         Transaction& syncInputWindows();
 #endif
diff --git a/libs/gui/tests/EndToEndNativeInputTest.cpp b/libs/gui/tests/EndToEndNativeInputTest.cpp
index 287a6f4..9674e24 100644
--- a/libs/gui/tests/EndToEndNativeInputTest.cpp
+++ b/libs/gui/tests/EndToEndNativeInputTest.cpp
@@ -47,8 +47,7 @@
 
 using android::os::IInputFlinger;
 
-namespace android {
-namespace test {
+namespace android::test {
 
 using Transaction = SurfaceComposerClient::Transaction;
 
@@ -176,6 +175,13 @@
         t.apply(true);
     }
 
+    void requestFocus() {
+        SurfaceComposerClient::Transaction t;
+        t.setFocusedWindow(mInputInfo.token, nullptr, systemTime(SYSTEM_TIME_MONOTONIC),
+                           0 /* displayId */);
+        t.apply(true);
+    }
+
 private:
     void waitForEventAvailable() {
         struct pollfd fd;
@@ -281,7 +287,6 @@
 TEST_F(InputSurfacesTest, can_receive_input) {
     std::unique_ptr<InputSurface> surface = makeSurface(100, 100);
     surface->showAt(100, 100);
-    surface->assertFocusChange(true);
 
     injectTap(101, 101);
 
@@ -297,12 +302,9 @@
 TEST_F(InputSurfacesTest, input_respects_positioning) {
     std::unique_ptr<InputSurface> surface = makeSurface(100, 100);
     surface->showAt(100, 100);
-    surface->assertFocusChange(true);
 
     std::unique_ptr<InputSurface> surface2 = makeSurface(100, 100);
     surface2->showAt(200, 200);
-    surface->assertFocusChange(false);
-    surface2->assertFocusChange(true);
 
     injectTap(201, 201);
     surface2->expectTap(1, 1);
@@ -329,16 +331,11 @@
     std::unique_ptr<InputSurface> surface2 = makeSurface(100, 100);
 
     surface->showAt(10, 10);
-    surface->assertFocusChange(true);
     surface2->showAt(10, 10);
-    surface->assertFocusChange(false);
-    surface2->assertFocusChange(true);
 
     surface->doTransaction([](auto &t, auto &sc) {
          t.setLayer(sc, LAYER_BASE + 1);
     });
-    surface2->assertFocusChange(false);
-    surface->assertFocusChange(true);
 
     injectTap(11, 11);
     surface->expectTap(1, 1);
@@ -346,8 +343,6 @@
     surface2->doTransaction([](auto &t, auto &sc) {
          t.setLayer(sc, LAYER_BASE + 1);
     });
-    surface2->assertFocusChange(true);
-    surface->assertFocusChange(false);
 
     injectTap(11, 11);
     surface2->expectTap(1, 1);
@@ -355,8 +350,6 @@
     surface2->doTransaction([](auto &t, auto &sc) {
          t.hide(sc);
     });
-    surface2->assertFocusChange(false);
-    surface->assertFocusChange(true);
 
     injectTap(11, 11);
     surface->expectTap(1, 1);
@@ -369,12 +362,9 @@
     std::unique_ptr<InputSurface> bgSurface = makeSurface(100, 100);
     std::unique_ptr<InputSurface> fgSurface = makeSurface(100, 100);
     bgSurface->showAt(100, 100);
-    bgSurface->assertFocusChange(true);
 
     fgSurface->mInputInfo.surfaceInset = 5;
     fgSurface->showAt(100, 100);
-    fgSurface->assertFocusChange(true);
-    bgSurface->assertFocusChange(false);
 
     injectTap(106, 106);
     fgSurface->expectTap(1, 1);
@@ -388,12 +378,9 @@
     std::unique_ptr<InputSurface> parentSurface = makeSurface(100, 100);
     std::unique_ptr<InputSurface> childSurface = makeSurface(100, 100);
     parentSurface->showAt(100, 100);
-    parentSurface->assertFocusChange(true);
 
     childSurface->mInputInfo.surfaceInset = 10;
     childSurface->showAt(100, 100);
-    childSurface->assertFocusChange(true);
-    parentSurface->assertFocusChange(false);
 
     childSurface->doTransaction([&](auto &t, auto &sc) {
         t.setPosition(sc, -5, -5);
@@ -412,12 +399,9 @@
     std::unique_ptr<InputSurface> bgSurface = makeSurface(100, 100);
     std::unique_ptr<InputSurface> fgSurface = makeSurface(100, 100);
     bgSurface->showAt(100, 100);
-    bgSurface->assertFocusChange(true);
 
     fgSurface->mInputInfo.surfaceInset = 5;
     fgSurface->showAt(100, 100);
-    bgSurface->assertFocusChange(false);
-    fgSurface->assertFocusChange(true);
 
     fgSurface->doTransaction([&](auto &t, auto &sc) { t.setMatrix(sc, 2.0, 0, 0, 4.0); });
 
@@ -434,7 +418,6 @@
     // In case we pass the very big inset without any checking.
     fgSurface->mInputInfo.surfaceInset = INT32_MAX;
     fgSurface->showAt(100, 100);
-    fgSurface->assertFocusChange(true);
 
     fgSurface->doTransaction([&](auto &t, auto &sc) { t.setMatrix(sc, 2.0, 0, 0, 2.0); });
 
@@ -451,7 +434,6 @@
         t.setTransparentRegionHint(sc, transparentRegion);
     });
     surface->showAt(100, 100);
-    surface->assertFocusChange(true);
     injectTap(101, 101);
     surface->expectTap(1, 1);
 }
@@ -466,10 +448,7 @@
             InputSurface::makeBufferInputSurface(mComposerClient, 100, 100);
 
     bgSurface->showAt(10, 10);
-    bgSurface->assertFocusChange(true);
     bufferSurface->showAt(10, 10);
-    bgSurface->assertFocusChange(false);
-    bufferSurface->assertFocusChange(true);
 
     injectTap(11, 11);
     bufferSurface->expectTap(1, 1);
@@ -486,10 +465,7 @@
     postBuffer(bufferSurface->mSurfaceControl);
 
     bgSurface->showAt(10, 10);
-    bgSurface->assertFocusChange(true);
     bufferSurface->showAt(10, 10);
-    bufferSurface->assertFocusChange(true);
-    bgSurface->assertFocusChange(false);
 
     injectTap(11, 11);
     bufferSurface->expectTap(1, 1);
@@ -505,10 +481,7 @@
     std::unique_ptr<InputSurface> fgSurface = makeSurface(100, 100);
 
     bgSurface->showAt(10, 10);
-    bgSurface->assertFocusChange(true);
     fgSurface->showAt(10, 10);
-    bgSurface->assertFocusChange(false);
-    fgSurface->assertFocusChange(true);
 
     injectTap(11, 11);
     fgSurface->expectTap(1, 1);
@@ -525,17 +498,12 @@
             InputSurface::makeContainerInputSurface(mComposerClient, 100, 100);
 
     bgSurface->showAt(10, 10);
-    bgSurface->assertFocusChange(true);
     containerSurface->showAt(10, 10);
-    bgSurface->assertFocusChange(false);
-    containerSurface->assertFocusChange(true);
 
     injectTap(11, 11);
     containerSurface->expectTap(1, 1);
 
     containerSurface->doTransaction([](auto &t, auto &sc) { t.hide(sc); });
-    containerSurface->assertFocusChange(false);
-    bgSurface->assertFocusChange(true);
 
     injectTap(11, 11);
     bgSurface->expectTap(1, 1);
@@ -544,7 +512,6 @@
 TEST_F(InputSurfacesTest, input_respects_outscreen) {
     std::unique_ptr<InputSurface> surface = makeSurface(100, 100);
     surface->showAt(-1, -1);
-    surface->assertFocusChange(true);
 
     injectTap(0, 0);
     surface->expectTap(1, 1);
@@ -556,11 +523,17 @@
             InputSurface::makeCursorInputSurface(mComposerClient, 10, 10);
 
     surface->showAt(10, 10);
-    surface->assertFocusChange(true);
     cursorSurface->showAt(10, 10);
 
     injectTap(11, 11);
     surface->expectTap(1, 1);
 }
+
+TEST_F(InputSurfacesTest, can_be_focused) {
+    std::unique_ptr<InputSurface> surface = makeSurface(100, 100);
+    surface->showAt(100, 100);
+    surface->requestFocus();
+
+    surface->assertFocusChange(true);
 }
-}
+} // namespace android::test
diff --git a/libs/input/android/FocusRequest.aidl b/libs/input/android/FocusRequest.aidl
index a5034a4..303dd1c 100644
--- a/libs/input/android/FocusRequest.aidl
+++ b/libs/input/android/FocusRequest.aidl
@@ -36,4 +36,8 @@
      * from another source such as pointer down.
      */
     long timestamp;
+    /**
+     * Display id associated with this request.
+     */
+     int displayId;
 }
diff --git a/services/inputflinger/dispatcher/InputDispatcher.cpp b/services/inputflinger/dispatcher/InputDispatcher.cpp
index b428c4e..7b7249a 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.cpp
+++ b/services/inputflinger/dispatcher/InputDispatcher.cpp
@@ -252,6 +252,15 @@
     return removed;
 }
 
+/**
+ * Find the entry in std::unordered_map by key and return the value as an optional.
+ */
+template <typename K, typename V>
+static std::optional<V> getOptionalValueByKey(const std::unordered_map<K, V>& map, K key) {
+    auto it = map.find(key);
+    return it != map.end() ? std::optional<V>{it->second} : std::nullopt;
+}
+
 static bool haveSameToken(const sp<InputWindowHandle>& first, const sp<InputWindowHandle>& second) {
     if (first == second) {
         return true;
@@ -342,6 +351,19 @@
     }
 }
 
+const char* InputDispatcher::typeToString(InputDispatcher::FocusResult result) {
+    switch (result) {
+        case InputDispatcher::FocusResult::OK:
+            return "Ok";
+        case InputDispatcher::FocusResult::NO_WINDOW:
+            return "Window not found";
+        case InputDispatcher::FocusResult::NOT_FOCUSABLE:
+            return "Window not focusable";
+        case InputDispatcher::FocusResult::NOT_VISIBLE:
+            return "Window not visible";
+    }
+}
+
 // --- InputDispatcher ---
 
 InputDispatcher::InputDispatcher(const sp<InputDispatcherPolicyInterface>& policy)
@@ -3792,26 +3814,31 @@
 
     updateWindowHandlesForDisplayLocked(inputWindowHandles, displayId);
 
-    sp<IBinder> newFocusedToken = nullptr;
-    bool foundHoveredWindow = false;
-    for (const sp<InputWindowHandle>& windowHandle : getWindowHandlesLocked(displayId)) {
-        // Set newFocusedToken to the top most focused window instead of the last one
-        if (!newFocusedToken && windowHandle->getInfo()->focusable &&
-            windowHandle->getInfo()->visible) {
-            newFocusedToken = windowHandle->getToken();
-        }
-        if (windowHandle == mLastHoverWindowHandle) {
-            foundHoveredWindow = true;
-        }
-    }
-
-    if (!foundHoveredWindow) {
+    const std::vector<sp<InputWindowHandle>>& windowHandles = getWindowHandlesLocked(displayId);
+    if (mLastHoverWindowHandle &&
+        std::find(windowHandles.begin(), windowHandles.end(), mLastHoverWindowHandle) ==
+                windowHandles.end()) {
         mLastHoverWindowHandle = nullptr;
     }
 
-    sp<IBinder> oldFocusedToken = getValueByKey(mFocusedWindowTokenByDisplay, displayId);
-    if (oldFocusedToken != newFocusedToken) {
-        onFocusChangedLocked(oldFocusedToken, newFocusedToken, displayId, "setInputWindowsLocked");
+    sp<IBinder> focusedToken = getValueByKey(mFocusedWindowTokenByDisplay, displayId);
+    if (focusedToken) {
+        FocusResult result = checkTokenFocusableLocked(focusedToken, displayId);
+        if (result != FocusResult::OK) {
+            onFocusChangedLocked(focusedToken, nullptr, displayId, typeToString(result));
+        }
+    }
+
+    std::optional<FocusRequest> focusRequest =
+            getOptionalValueByKey(mPendingFocusRequests, displayId);
+    if (focusRequest) {
+        // If the window from the pending request is now visible, provide it focus.
+        FocusResult result = handleFocusRequestLocked(*focusRequest);
+        if (result != FocusResult::NOT_VISIBLE) {
+            // Drop the request if we were able to change the focus or we cannot change
+            // it for another reason.
+            mPendingFocusRequests.erase(displayId);
+        }
     }
 
     std::unordered_map<int32_t, TouchState>::iterator stateIt =
@@ -5183,7 +5210,67 @@
  *  when requesting the focus change. This determines which request gets
  *  precedence if there is a focus change request from another source such as pointer down.
  */
-void InputDispatcher::setFocusedWindow(const FocusRequest& request) {}
+void InputDispatcher::setFocusedWindow(const FocusRequest& request) {
+    { // acquire lock
+        std::scoped_lock _l(mLock);
+
+        const int32_t displayId = request.displayId;
+        const sp<IBinder> oldFocusedToken = getValueByKey(mFocusedWindowTokenByDisplay, displayId);
+        if (request.focusedToken && oldFocusedToken != request.focusedToken) {
+            ALOGD_IF(DEBUG_FOCUS,
+                     "setFocusedWindow on display %" PRId32
+                     " ignored, reason: focusedToken is not focused",
+                     displayId);
+            return;
+        }
+
+        mPendingFocusRequests.erase(displayId);
+        FocusResult result = handleFocusRequestLocked(request);
+        if (result == FocusResult::NOT_VISIBLE) {
+            // The requested window is not currently visible. Wait for the window to become visible
+            // and then provide it focus. This is to handle situations where a user action triggers
+            // a new window to appear. We want to be able to queue any key events after the user
+            // action and deliver it to the newly focused window. In order for this to happen, we
+            // take focus from the currently focused window so key events can be queued.
+            ALOGD_IF(DEBUG_FOCUS,
+                     "setFocusedWindow on display %" PRId32
+                     " pending, reason: window is not visible",
+                     displayId);
+            mPendingFocusRequests[displayId] = request;
+            onFocusChangedLocked(oldFocusedToken, nullptr, displayId,
+                                 "setFocusedWindow_AwaitingWindowVisibility");
+        } else if (result != FocusResult::OK) {
+            ALOGW("setFocusedWindow on display %" PRId32 " ignored, reason:%s", displayId,
+                  typeToString(result));
+        }
+    } // release lock
+    // Wake up poll loop since it may need to make new input dispatching choices.
+    mLooper->wake();
+}
+
+InputDispatcher::FocusResult InputDispatcher::handleFocusRequestLocked(
+        const FocusRequest& request) {
+    const int32_t displayId = request.displayId;
+    const sp<IBinder> newFocusedToken = request.token;
+    const sp<IBinder> oldFocusedToken = getValueByKey(mFocusedWindowTokenByDisplay, displayId);
+
+    if (oldFocusedToken == request.token) {
+        ALOGD_IF(DEBUG_FOCUS,
+                 "setFocusedWindow on display %" PRId32 " ignored, reason: already focused",
+                 displayId);
+        return FocusResult::OK;
+    }
+
+    FocusResult result = checkTokenFocusableLocked(newFocusedToken, displayId);
+    if (result != FocusResult::OK) {
+        return result;
+    }
+
+    std::string_view reason =
+            (request.focusedToken) ? "setFocusedWindow_FocusCheck" : "setFocusedWindow";
+    onFocusChangedLocked(oldFocusedToken, newFocusedToken, displayId, reason);
+    return FocusResult::OK;
+}
 
 void InputDispatcher::onFocusChangedLocked(const sp<IBinder>& oldFocusedToken,
                                            const sp<IBinder>& newFocusedToken, int32_t displayId,
@@ -5207,4 +5294,48 @@
         notifyFocusChangedLocked(oldFocusedToken, newFocusedToken);
     }
 }
+
+/**
+ * Checks if the window token can be focused on a display. The token can be focused if there is
+ * at least one window handle that is visible with the same token and all window handles with the
+ * same token are focusable.
+ *
+ * In the case of mirroring, two windows may share the same window token and their visibility
+ * might be different. Example, the mirrored window can cover the window its mirroring. However,
+ * we expect the focusability of the windows to match since its hard to reason why one window can
+ * receive focus events and the other cannot when both are backed by the same input channel.
+ */
+InputDispatcher::FocusResult InputDispatcher::checkTokenFocusableLocked(const sp<IBinder>& token,
+                                                                        int32_t displayId) const {
+    bool allWindowsAreFocusable = true;
+    bool visibleWindowFound = false;
+    bool windowFound = false;
+    for (const sp<InputWindowHandle>& window : getWindowHandlesLocked(displayId)) {
+        if (window->getToken() != token) {
+            continue;
+        }
+        windowFound = true;
+        if (window->getInfo()->visible) {
+            // Check if at least a single window is visible.
+            visibleWindowFound = true;
+        }
+        if (!window->getInfo()->focusable) {
+            // Check if all windows with the window token are focusable.
+            allWindowsAreFocusable = false;
+            break;
+        }
+    }
+
+    if (!windowFound) {
+        return FocusResult::NO_WINDOW;
+    }
+    if (!allWindowsAreFocusable) {
+        return FocusResult::NOT_FOCUSABLE;
+    }
+    if (!visibleWindowFound) {
+        return FocusResult::NOT_VISIBLE;
+    }
+
+    return FocusResult::OK;
+}
 } // namespace android::inputdispatcher
diff --git a/services/inputflinger/dispatcher/InputDispatcher.h b/services/inputflinger/dispatcher/InputDispatcher.h
index 93d3fde..8f3d5dc 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.h
+++ b/services/inputflinger/dispatcher/InputDispatcher.h
@@ -136,6 +136,14 @@
         STALE,
     };
 
+    enum class FocusResult {
+        OK,
+        NO_WINDOW,
+        NOT_FOCUSABLE,
+        NOT_VISIBLE,
+    };
+    static const char* typeToString(FocusResult result);
+
     std::unique_ptr<InputThread> mThread;
 
     sp<InputDispatcherPolicyInterface> mPolicy;
@@ -308,6 +316,9 @@
     sp<InputWindowHandle> getFocusedWindowHandleLocked(int displayId) const REQUIRES(mLock);
     bool hasWindowHandleLocked(const sp<InputWindowHandle>& windowHandle) const REQUIRES(mLock);
     bool hasResponsiveConnectionLocked(InputWindowHandle& windowHandle) const REQUIRES(mLock);
+    FocusResult handleFocusRequestLocked(const FocusRequest&) REQUIRES(mLock);
+    FocusResult checkTokenFocusableLocked(const sp<IBinder>& token, int32_t displayId) const
+            REQUIRES(mLock);
 
     /*
      * Validate and update InputWindowHandles for a given display.
@@ -380,6 +391,14 @@
      */
     std::shared_ptr<InputApplicationHandle> mAwaitedFocusedApplication GUARDED_BY(mLock);
 
+    /**
+     * This map will store the pending focus requests that cannot be currently processed. This can
+     * happen if the window requested to be focused is not currently visible. Such a window might
+     * become visible later, and these requests would be processed at that time.
+     */
+    std::unordered_map<int32_t /* displayId */, FocusRequest> mPendingFocusRequests
+            GUARDED_BY(mLock);
+
     // Optimization: AnrTracker is used to quickly find which connection is due for a timeout next.
     // AnrTracker must be kept in-sync with all responsive connection.waitQueues.
     // If a connection is not responsive, then the entries should not be added to the AnrTracker.
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index 3e0b5e8..6e08e1b 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -328,6 +328,18 @@
             ALOGE("%s", to.c_str());
         }
     }
+
+    void setFocusedWindow(const sp<InputWindowHandle>& window,
+                          const sp<InputWindowHandle>& focusedWindow = nullptr) {
+        FocusRequest request;
+        request.token = window->getToken();
+        if (focusedWindow) {
+            request.focusedToken = focusedWindow->getToken();
+        }
+        request.timestamp = systemTime(SYSTEM_TIME_MONOTONIC);
+        request.displayId = window->getInfo()->displayId;
+        mDispatcher->setFocusedWindow(request);
+    }
 };
 
 
@@ -725,6 +737,8 @@
 
     void setFocusable(bool focusable) { mInfo.focusable = focusable; }
 
+    void setVisible(bool visible) { mInfo.visible = visible; }
+
     void setDispatchingTimeout(std::chrono::nanoseconds timeout) {
         mInfo.dispatchingTimeout = timeout;
     }
@@ -1161,80 +1175,6 @@
     windowSecond->assertNoEvents();
 }
 
-TEST_F(InputDispatcherTest, SetInputWindow_FocusedWindow) {
-    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
-    sp<FakeWindowHandle> windowTop = new FakeWindowHandle(application, mDispatcher, "Top",
-            ADISPLAY_ID_DEFAULT);
-    sp<FakeWindowHandle> windowSecond = new FakeWindowHandle(application, mDispatcher, "Second",
-            ADISPLAY_ID_DEFAULT);
-
-    // Set focused application.
-    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
-
-    // Display should have only one focused window
-    windowSecond->setFocusable(true);
-    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowTop, windowSecond}}});
-
-    windowSecond->consumeFocusEvent(true);
-    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
-            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
-
-    // Focused window should receive event.
-    windowTop->assertNoEvents();
-    windowSecond->consumeKeyDown(ADISPLAY_ID_NONE);
-}
-
-TEST_F(InputDispatcherTest, SetInputWindow_FocusPriority) {
-    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
-    sp<FakeWindowHandle> windowTop = new FakeWindowHandle(application, mDispatcher, "Top",
-            ADISPLAY_ID_DEFAULT);
-    sp<FakeWindowHandle> windowSecond = new FakeWindowHandle(application, mDispatcher, "Second",
-            ADISPLAY_ID_DEFAULT);
-
-    // Set focused application.
-    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
-
-    // Display has two focused windows. Add them to inputWindowsHandles in z-order (top most first)
-    windowTop->setFocusable(true);
-    windowSecond->setFocusable(true);
-
-    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowTop, windowSecond}}});
-    windowTop->consumeFocusEvent(true);
-    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
-            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
-
-    // Top focused window should receive event.
-    windowTop->consumeKeyDown(ADISPLAY_ID_NONE);
-    windowSecond->assertNoEvents();
-}
-
-TEST_F(InputDispatcherTest, SetInputWindow_InputWindowInfo) {
-    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
-
-    sp<FakeWindowHandle> windowTop = new FakeWindowHandle(application, mDispatcher, "Top",
-            ADISPLAY_ID_DEFAULT);
-    sp<FakeWindowHandle> windowSecond = new FakeWindowHandle(application, mDispatcher, "Second",
-            ADISPLAY_ID_DEFAULT);
-
-    // Set focused application.
-    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
-
-    windowTop->setFocusable(true);
-    windowSecond->setFocusable(true);
-    // Release channel for window is no longer valid.
-    windowTop->releaseChannel();
-    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowTop, windowSecond}}});
-    windowSecond->consumeFocusEvent(true);
-
-    // Test inject a key down, should dispatch to a valid window.
-    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
-            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
-
-    // Top window is invalid, so it should not receive any input event.
-    windowTop->assertNoEvents();
-    windowSecond->consumeKeyDown(ADISPLAY_ID_NONE);
-}
-
 TEST_F(InputDispatcherTest, HoverMoveEnterMouseClickAndHoverMoveExit) {
     std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
     sp<FakeWindowHandle> windowLeft =
@@ -1459,6 +1399,8 @@
     window->setFocusable(true);
 
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
+
     window->consumeFocusEvent(true);
 
     NotifyKeyArgs keyArgs = generateKeyArgs(AKEY_EVENT_ACTION_DOWN, ADISPLAY_ID_DEFAULT);
@@ -1660,6 +1602,7 @@
 
     window->setFocusable(true);
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
 
     window->consumeFocusEvent(true);
 
@@ -1769,6 +1712,8 @@
     window->setFocusable(true);
 
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
+
     window->consumeFocusEvent(true);
 
     FakeMonitorReceiver monitor = FakeMonitorReceiver(mDispatcher, "GM_1", ADISPLAY_ID_DEFAULT,
@@ -1862,6 +1807,8 @@
 
     SCOPED_TRACE("Check default value of touch mode");
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
+
     window->consumeFocusEvent(true /*hasFocus*/, true /*inTouchMode*/);
 
     SCOPED_TRACE("Remove the window to trigger focus loss");
@@ -1873,6 +1820,7 @@
     mDispatcher->setInTouchMode(false);
     window->setFocusable(true);
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
     window->consumeFocusEvent(true /*hasFocus*/, false /*inTouchMode*/);
 
     SCOPED_TRACE("Remove the window to trigger focus loss");
@@ -1884,6 +1832,7 @@
     mDispatcher->setInTouchMode(true);
     window->setFocusable(true);
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
     window->consumeFocusEvent(true /*hasFocus*/, true /*inTouchMode*/);
 
     window->assertNoEvents();
@@ -1898,6 +1847,8 @@
     window->setFocusable(true);
 
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
+
     window->consumeFocusEvent(true /*hasFocus*/, true /*inTouchMode*/);
 
     NotifyKeyArgs keyArgs = generateKeyArgs(AKEY_EVENT_ACTION_DOWN);
@@ -2020,6 +1971,151 @@
     ASSERT_NE(initialHmac, mDispatcher->sign(verifiedEvent));
 }
 
+TEST_F(InputDispatcherTest, SetFocusedWindow) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> windowTop =
+            new FakeWindowHandle(application, mDispatcher, "Top", ADISPLAY_ID_DEFAULT);
+    sp<FakeWindowHandle> windowSecond =
+            new FakeWindowHandle(application, mDispatcher, "Second", ADISPLAY_ID_DEFAULT);
+    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
+
+    // Top window is also focusable but is not granted focus.
+    windowTop->setFocusable(true);
+    windowSecond->setFocusable(true);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowTop, windowSecond}}});
+    setFocusedWindow(windowSecond);
+
+    windowSecond->consumeFocusEvent(true);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+
+    // Focused window should receive event.
+    windowSecond->consumeKeyDown(ADISPLAY_ID_NONE);
+    windowTop->assertNoEvents();
+}
+
+TEST_F(InputDispatcherTest, SetFocusedWindow_DropRequestInvalidChannel) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> window =
+            new FakeWindowHandle(application, mDispatcher, "TestWindow", ADISPLAY_ID_DEFAULT);
+    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
+
+    window->setFocusable(true);
+    // Release channel for window is no longer valid.
+    window->releaseChannel();
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
+
+    // Test inject a key down, should timeout.
+    ASSERT_EQ(INPUT_EVENT_INJECTION_TIMED_OUT, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_TIMED_OUT";
+
+    // window channel is invalid, so it should not receive any input event.
+    window->assertNoEvents();
+}
+
+TEST_F(InputDispatcherTest, SetFocusedWindow_DropRequestNoFocusableWindow) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> window =
+            new FakeWindowHandle(application, mDispatcher, "TestWindow", ADISPLAY_ID_DEFAULT);
+    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
+
+    // Window is not focusable.
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    setFocusedWindow(window);
+
+    // Test inject a key down, should timeout.
+    ASSERT_EQ(INPUT_EVENT_INJECTION_TIMED_OUT, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_TIMED_OUT";
+
+    // window is invalid, so it should not receive any input event.
+    window->assertNoEvents();
+}
+
+TEST_F(InputDispatcherTest, SetFocusedWindow_CheckFocusedToken) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> windowTop =
+            new FakeWindowHandle(application, mDispatcher, "Top", ADISPLAY_ID_DEFAULT);
+    sp<FakeWindowHandle> windowSecond =
+            new FakeWindowHandle(application, mDispatcher, "Second", ADISPLAY_ID_DEFAULT);
+    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
+
+    windowTop->setFocusable(true);
+    windowSecond->setFocusable(true);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowTop, windowSecond}}});
+    setFocusedWindow(windowTop);
+    windowTop->consumeFocusEvent(true);
+
+    setFocusedWindow(windowSecond, windowTop);
+    windowSecond->consumeFocusEvent(true);
+    windowTop->consumeFocusEvent(false);
+
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+
+    // Focused window should receive event.
+    windowSecond->consumeKeyDown(ADISPLAY_ID_NONE);
+}
+
+TEST_F(InputDispatcherTest, SetFocusedWindow_DropRequestFocusTokenNotFocused) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> windowTop =
+            new FakeWindowHandle(application, mDispatcher, "Top", ADISPLAY_ID_DEFAULT);
+    sp<FakeWindowHandle> windowSecond =
+            new FakeWindowHandle(application, mDispatcher, "Second", ADISPLAY_ID_DEFAULT);
+    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
+
+    windowTop->setFocusable(true);
+    windowSecond->setFocusable(true);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowTop, windowSecond}}});
+    setFocusedWindow(windowSecond, windowTop);
+
+    ASSERT_EQ(INPUT_EVENT_INJECTION_TIMED_OUT, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_TIMED_OUT";
+
+    // Event should be dropped.
+    windowTop->assertNoEvents();
+    windowSecond->assertNoEvents();
+}
+
+TEST_F(InputDispatcherTest, SetFocusedWindow_DeferInvisibleWindow) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> window =
+            new FakeWindowHandle(application, mDispatcher, "TestWindow", ADISPLAY_ID_DEFAULT);
+    sp<FakeWindowHandle> previousFocusedWindow =
+            new FakeWindowHandle(application, mDispatcher, "previousFocusedWindow",
+                                 ADISPLAY_ID_DEFAULT);
+    mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application);
+
+    window->setFocusable(true);
+    previousFocusedWindow->setFocusable(true);
+    window->setVisible(false);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window, previousFocusedWindow}}});
+    setFocusedWindow(previousFocusedWindow);
+    previousFocusedWindow->consumeFocusEvent(true);
+
+    // Requesting focus on invisible window takes focus from currently focused window.
+    setFocusedWindow(window);
+    previousFocusedWindow->consumeFocusEvent(false);
+
+    // Injected key goes to pending queue.
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED,
+              injectKey(mDispatcher, AKEY_EVENT_ACTION_DOWN, 0 /* repeatCount */,
+                        ADISPLAY_ID_DEFAULT, INPUT_EVENT_INJECTION_SYNC_NONE));
+
+    // Window does not get focus event or key down.
+    window->assertNoEvents();
+
+    // Window becomes visible.
+    window->setVisible(true);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+
+    // Window receives focus event.
+    window->consumeFocusEvent(true);
+    // Focused window receives key down.
+    window->consumeKeyDown(ADISPLAY_ID_DEFAULT);
+}
+
 class InputDispatcherKeyRepeatTest : public InputDispatcherTest {
 protected:
     static constexpr nsecs_t KEY_REPEAT_TIMEOUT = 40 * 1000000; // 40 ms
@@ -2044,7 +2140,7 @@
 
         mWindow->setFocusable(true);
         mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow}}});
-
+        setFocusedWindow(mWindow);
         mWindow->consumeFocusEvent(true);
     }
 
@@ -2134,6 +2230,7 @@
         mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, application1);
         windowInPrimary->setFocusable(true);
         mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowInPrimary}}});
+        setFocusedWindow(windowInPrimary);
         windowInPrimary->consumeFocusEvent(true);
 
         application2 = std::make_shared<FakeApplicationHandle>();
@@ -2146,6 +2243,7 @@
         mDispatcher->setFocusedApplication(SECOND_DISPLAY_ID, application2);
         windowInSecondary->setFocusable(true);
         mDispatcher->setInputWindows({{SECOND_DISPLAY_ID, {windowInSecondary}}});
+        setFocusedWindow(windowInSecondary);
         windowInSecondary->consumeFocusEvent(true);
     }
 
@@ -2263,6 +2361,23 @@
     monitorInSecondary.consumeKeyDown(ADISPLAY_ID_NONE);
 }
 
+TEST_F(InputDispatcherFocusOnTwoDisplaysTest, CanFocusWindowOnUnfocusedDisplay) {
+    sp<FakeWindowHandle> secondWindowInPrimary =
+            new FakeWindowHandle(application1, mDispatcher, "D_1_W2", ADISPLAY_ID_DEFAULT);
+    secondWindowInPrimary->setFocusable(true);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {windowInPrimary, secondWindowInPrimary}}});
+    setFocusedWindow(secondWindowInPrimary);
+    windowInPrimary->consumeFocusEvent(false);
+    secondWindowInPrimary->consumeFocusEvent(true);
+
+    // Test inject a key down.
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher, ADISPLAY_ID_DEFAULT))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    windowInPrimary->assertNoEvents();
+    windowInSecondary->assertNoEvents();
+    secondWindowInPrimary->consumeKeyDown(ADISPLAY_ID_DEFAULT);
+}
+
 class InputFilterTest : public InputDispatcherTest {
 protected:
     static constexpr int32_t SECOND_DISPLAY_ID = 1;
@@ -2360,6 +2475,7 @@
 
         // Expect one focus window exist in display.
         mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mUnfocusedWindow, mFocusedWindow}}});
+        setFocusedWindow(mFocusedWindow);
         mFocusedWindow->consumeFocusEvent(true);
     }
 
@@ -2653,6 +2769,7 @@
         mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, mApplication);
 
         mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow}}});
+        setFocusedWindow(mWindow);
         mWindow->consumeFocusEvent(true);
     }
 
@@ -3046,6 +3163,7 @@
 
         // Expect one focus window exist in display.
         mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mUnfocusedWindow, mFocusedWindow}}});
+        setFocusedWindow(mFocusedWindow);
         mFocusedWindow->consumeFocusEvent(true);
     }
 
@@ -3242,6 +3360,7 @@
     mFocusedWindow->setFocusable(false);
     mUnfocusedWindow->setFocusable(true);
     mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mFocusedWindow, mUnfocusedWindow}}});
+    setFocusedWindow(mUnfocusedWindow);
 
     // Focus events should precede the key events
     mUnfocusedWindow->consumeFocusEvent(true);
@@ -3379,4 +3498,147 @@
     mBottomWindow->assertNoEvents();
 }
 
+class InputDispatcherMirrorWindowFocusTests : public InputDispatcherTest {
+protected:
+    std::shared_ptr<FakeApplicationHandle> mApp;
+    sp<FakeWindowHandle> mWindow;
+    sp<FakeWindowHandle> mMirror;
+
+    virtual void SetUp() override {
+        InputDispatcherTest::SetUp();
+        mApp = std::make_shared<FakeApplicationHandle>();
+        mWindow = new FakeWindowHandle(mApp, mDispatcher, "TestWindow", ADISPLAY_ID_DEFAULT);
+        mMirror = new FakeWindowHandle(mApp, mDispatcher, "TestWindowMirror", ADISPLAY_ID_DEFAULT,
+                                       mWindow->getToken());
+        mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, mApp);
+        mWindow->setFocusable(true);
+        mMirror->setFocusable(true);
+        mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow, mMirror}}});
+    }
+};
+
+TEST_F(InputDispatcherMirrorWindowFocusTests, CanGetFocus) {
+    // Request focus on a mirrored window
+    setFocusedWindow(mMirror);
+
+    // window gets focused
+    mWindow->consumeFocusEvent(true);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyDown(ADISPLAY_ID_NONE);
+}
+
+// A focused & mirrored window remains focused only if the window and its mirror are both
+// focusable.
+TEST_F(InputDispatcherMirrorWindowFocusTests, FocusedIfAllWindowsFocusable) {
+    setFocusedWindow(mMirror);
+
+    // window gets focused
+    mWindow->consumeFocusEvent(true);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyDown(ADISPLAY_ID_NONE);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyUp(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyUp(ADISPLAY_ID_NONE);
+
+    mMirror->setFocusable(false);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow, mMirror}}});
+
+    // window loses focus since one of the windows associated with the token in not focusable
+    mWindow->consumeFocusEvent(false);
+
+    ASSERT_EQ(INPUT_EVENT_INJECTION_TIMED_OUT, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_TIMED_OUT";
+    mWindow->assertNoEvents();
+}
+
+// A focused & mirrored window remains focused until the window and its mirror both become
+// invisible.
+TEST_F(InputDispatcherMirrorWindowFocusTests, FocusedIfAnyWindowVisible) {
+    setFocusedWindow(mMirror);
+
+    // window gets focused
+    mWindow->consumeFocusEvent(true);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyDown(ADISPLAY_ID_NONE);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyUp(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyUp(ADISPLAY_ID_NONE);
+
+    mMirror->setVisible(false);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow, mMirror}}});
+
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyDown(ADISPLAY_ID_NONE);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyUp(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyUp(ADISPLAY_ID_NONE);
+
+    mWindow->setVisible(false);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow, mMirror}}});
+
+    // window loses focus only after all windows associated with the token become invisible.
+    mWindow->consumeFocusEvent(false);
+
+    ASSERT_EQ(INPUT_EVENT_INJECTION_TIMED_OUT, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_TIMED_OUT";
+    mWindow->assertNoEvents();
+}
+
+// A focused & mirrored window remains focused until both windows are removed.
+TEST_F(InputDispatcherMirrorWindowFocusTests, FocusedWhileWindowsAlive) {
+    setFocusedWindow(mMirror);
+
+    // window gets focused
+    mWindow->consumeFocusEvent(true);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyDown(ADISPLAY_ID_NONE);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyUp(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyUp(ADISPLAY_ID_NONE);
+
+    // single window is removed but the window token remains focused
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mMirror}}});
+
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyDown(ADISPLAY_ID_NONE);
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, injectKeyUp(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_SUCCEEDED";
+    mWindow->consumeKeyUp(ADISPLAY_ID_NONE);
+
+    // Both windows are removed
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {}}});
+    mWindow->consumeFocusEvent(false);
+
+    ASSERT_EQ(INPUT_EVENT_INJECTION_TIMED_OUT, injectKeyDown(mDispatcher))
+            << "Inject key event should return INPUT_EVENT_INJECTION_TIMED_OUT";
+    mWindow->assertNoEvents();
+}
+
+// Focus request can be pending until one window becomes visible.
+TEST_F(InputDispatcherMirrorWindowFocusTests, DeferFocusWhenInvisible) {
+    // Request focus on an invisible mirror.
+    mWindow->setVisible(false);
+    mMirror->setVisible(false);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow, mMirror}}});
+    setFocusedWindow(mMirror);
+
+    // Injected key goes to pending queue.
+    ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED,
+              injectKey(mDispatcher, AKEY_EVENT_ACTION_DOWN, 0 /* repeatCount */,
+                        ADISPLAY_ID_DEFAULT, INPUT_EVENT_INJECTION_SYNC_NONE));
+
+    mMirror->setVisible(true);
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow, mMirror}}});
+
+    // window gets focused
+    mWindow->consumeFocusEvent(true);
+    // window gets the pending key event
+    mWindow->consumeKeyDown(ADISPLAY_ID_DEFAULT);
+}
 } // namespace android::inputdispatcher
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 9e5b8d8..6c14ce5 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2915,6 +2915,9 @@
         setInputWindowsFinished();
     }
 
+    for (const auto& focusRequest : mInputWindowCommands.focusRequests) {
+        mInputFlinger->setFocusedWindow(focusRequest);
+    }
     mInputWindowCommands.clear();
 }
 
@@ -2932,10 +2935,6 @@
     mInputFlinger->setInputWindows(inputInfos,
                                mInputWindowCommands.syncInputWindows ? mSetInputWindowsListener
                                                                      : nullptr);
-    for (const auto& focusRequest : mInputWindowCommands.focusRequests) {
-        mInputFlinger->setFocusedWindow(focusRequest);
-    }
-    mInputWindowCommands.focusRequests.clear();
 }
 
 void SurfaceFlinger::commitInputWindowCommands() {
@@ -3479,7 +3478,11 @@
     }
     transactionFlags |= clientStateFlags;
 
-    transactionFlags |= addInputWindowCommands(inputWindowCommands);
+    if (privileged) {
+        transactionFlags |= addInputWindowCommands(inputWindowCommands);
+    } else if (!inputWindowCommands.empty()) {
+        ALOGE("Only privileged callers are allowed to send input commands.");
+    }
 
     if (uncacheBuffer.isValid()) {
         ClientCache::getInstance().erase(uncacheBuffer);
@@ -3947,7 +3950,7 @@
 }
 
 uint32_t SurfaceFlinger::addInputWindowCommands(const InputWindowCommands& inputWindowCommands) {
-    const bool hasChanges = mPendingInputWindowCommands.merge(inputWindowCommands);
+    bool hasChanges = mPendingInputWindowCommands.merge(inputWindowCommands);
     return hasChanges ? eTraversalNeeded : 0;
 }