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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "FocusResolver"
#define ATRACE_TAG ATRACE_TAG_INPUT
#define INDENT " "
#define INDENT2 " "
// Log debug messages about input focus tracking.
static constexpr bool DEBUG_FOCUS = false;
#include <inttypes.h>
#include <android-base/stringprintf.h>
#include <binder/Binder.h>
#include <input/InputWindow.h>
#include <input/NamedEnum.h>
#include <log/log.h>
#include "FocusResolver.h"
namespace android::inputdispatcher {
sp<IBinder> FocusResolver::getFocusedWindowToken(int32_t displayId) const {
auto it = mFocusedWindowTokenByDisplay.find(displayId);
return it != mFocusedWindowTokenByDisplay.end() ? it->second.second : nullptr;
}
std::optional<FocusRequest> FocusResolver::getFocusRequest(int32_t displayId) {
auto it = mFocusRequestByDisplay.find(displayId);
return it != mFocusRequestByDisplay.end() ? std::make_optional<>(it->second) : std::nullopt;
}
/**
* 'setInputWindows' is called when the window properties change. Here we will check whether the
* currently focused window can remain focused. If the currently focused window remains eligible
* for focus ('isTokenFocusable' returns OK), then we will continue to grant it focus otherwise
* we will check if the previous focus request is eligible to receive focus.
*/
std::optional<FocusResolver::FocusChanges> FocusResolver::setInputWindows(
int32_t displayId, const std::vector<sp<InputWindowHandle>>& windows) {
std::string removeFocusReason;
// Check if the currently focused window is still focusable.
const sp<IBinder> currentFocus = getFocusedWindowToken(displayId);
if (currentFocus) {
Focusability result = isTokenFocusable(currentFocus, windows);
if (result == Focusability::OK) {
return std::nullopt;
}
removeFocusReason = NamedEnum::string(result);
}
// We don't have a focused window or the currently focused window is no longer focusable. Check
// to see if we can grant focus to the window that previously requested focus.
const std::optional<FocusRequest> request = getFocusRequest(displayId);
if (request) {
sp<IBinder> requestedFocus = request->token;
const Focusability result = isTokenFocusable(requestedFocus, windows);
const Focusability previousResult = mLastFocusResultByDisplay[displayId];
mLastFocusResultByDisplay[displayId] = result;
if (result == Focusability::OK) {
return updateFocusedWindow(displayId,
"Window became focusable. Previous reason: " +
NamedEnum::string(previousResult),
requestedFocus, request->windowName);
}
}
// Focused window is no longer focusable and we don't have a suitable focus request to grant.
// Remove focus if needed.
return updateFocusedWindow(displayId, removeFocusReason, nullptr);
}
std::optional<FocusResolver::FocusChanges> FocusResolver::setFocusedWindow(
const FocusRequest& request, const std::vector<sp<InputWindowHandle>>& windows) {
const int32_t displayId = request.displayId;
const sp<IBinder> currentFocus = getFocusedWindowToken(displayId);
if (currentFocus == request.token) {
ALOGD_IF(DEBUG_FOCUS,
"setFocusedWindow %s on display %" PRId32 " ignored, reason: already focused",
request.windowName.c_str(), displayId);
return std::nullopt;
}
// Handle conditional focus requests, i.e. requests that have a focused token. These requests
// are not persistent. If the window is no longer focusable, we expect focus to go back to the
// previously focused window.
if (request.focusedToken) {
if (currentFocus != request.focusedToken) {
ALOGW("setFocusedWindow %s on display %" PRId32
" ignored, reason: focusedToken %s is not focused",
request.windowName.c_str(), displayId, request.focusedWindowName.c_str());
return std::nullopt;
}
Focusability result = isTokenFocusable(request.token, windows);
if (result == Focusability::OK) {
return updateFocusedWindow(displayId, "setFocusedWindow with focus check",
request.token, request.windowName);
}
ALOGW("setFocusedWindow %s on display %" PRId32 " ignored, reason: %s",
request.windowName.c_str(), displayId, NamedEnum::string(result).c_str());
return std::nullopt;
}
Focusability result = isTokenFocusable(request.token, windows);
// Update focus request. The focus resolver will always try to handle this request if there is
// no focused window on the display.
mFocusRequestByDisplay[displayId] = request;
mLastFocusResultByDisplay[displayId] = result;
if (result == Focusability::OK) {
return updateFocusedWindow(displayId, "setFocusedWindow", request.token,
request.windowName);
}
// The requested window is not currently focusable. Wait for the window to become focusable
// but remove focus from the current window so that input events can go into a pending queue
// and be sent to the window when it becomes focused.
return updateFocusedWindow(displayId, "Waiting for window because " + NamedEnum::string(result),
nullptr);
}
FocusResolver::Focusability FocusResolver::isTokenFocusable(
const sp<IBinder>& token, const std::vector<sp<InputWindowHandle>>& windows) {
bool allWindowsAreFocusable = true;
bool visibleWindowFound = false;
bool windowFound = false;
for (const sp<InputWindowHandle>& window : windows) {
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 Focusability::NO_WINDOW;
}
if (!allWindowsAreFocusable) {
return Focusability::NOT_FOCUSABLE;
}
if (!visibleWindowFound) {
return Focusability::NOT_VISIBLE;
}
return Focusability::OK;
}
std::optional<FocusResolver::FocusChanges> FocusResolver::updateFocusedWindow(
int32_t displayId, const std::string& reason, const sp<IBinder>& newFocus,
const std::string& tokenName) {
sp<IBinder> oldFocus = getFocusedWindowToken(displayId);
if (newFocus == oldFocus) {
return std::nullopt;
}
if (newFocus) {
mFocusedWindowTokenByDisplay[displayId] = {tokenName, newFocus};
} else {
mFocusedWindowTokenByDisplay.erase(displayId);
}
return {{oldFocus, newFocus, displayId, reason}};
}
std::string FocusResolver::dumpFocusedWindows() const {
if (mFocusedWindowTokenByDisplay.empty()) {
return INDENT "FocusedWindows: <none>\n";
}
std::string dump;
dump += INDENT "FocusedWindows:\n";
for (const auto& [displayId, namedToken] : mFocusedWindowTokenByDisplay) {
dump += base::StringPrintf(INDENT2 "displayId=%" PRId32 ", name='%s'\n", displayId,
namedToken.first.c_str());
}
return dump;
}
std::string FocusResolver::dump() const {
std::string dump = dumpFocusedWindows();
if (mFocusRequestByDisplay.empty()) {
return dump + INDENT "FocusRequests: <none>\n";
}
dump += INDENT "FocusRequests:\n";
for (const auto& [displayId, request] : mFocusRequestByDisplay) {
auto it = mLastFocusResultByDisplay.find(displayId);
std::string result =
it != mLastFocusResultByDisplay.end() ? NamedEnum::string(it->second) : "";
dump += base::StringPrintf(INDENT2 "displayId=%" PRId32 ", name='%s' result='%s'\n",
displayId, request.windowName.c_str(), result.c_str());
}
return dump;
}
void FocusResolver::displayRemoved(int32_t displayId) {
mFocusRequestByDisplay.erase(displayId);
mLastFocusResultByDisplay.erase(displayId);
}
} // namespace android::inputdispatcher
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