xplat/js/react-native-github/packages/react-native/ReactCommon/react/renderer/components/text/ParagraphEventEmitter.cpp

packages/react-native/ReactCommon/react/renderer/components/text/tests/ParagraphEventEmitterTest.cpp

@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <react/renderer/components/text/ParagraphEventEmitter.h>
+
+#include <gtest/gtest.h>
+#include <hermes/hermes.h>
+#include <react/renderer/core/EventBeat.h>
+#include <react/renderer/core/EventDispatcher.h>
+#include <react/renderer/core/EventListener.h>
+#include <react/renderer/runtimescheduler/RuntimeScheduler.h>
+
+namespace facebook::react {
+
+namespace {
+
+struct CapturedEvent {
+  std::string type;
+  SharedEventPayload payload;
+};
+
+class ParagraphEventEmitterTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    runtime_ = facebook::hermes::makeHermesRuntime(
+        ::hermes::vm::RuntimeConfig::Builder().build());
+
+    RuntimeExecutor runtimeExecutor =
+        [this](std::function<void(jsi::Runtime&)>&& callback) {
+          callback(*runtime_);
+        };
+    runtimeScheduler_ = std::make_unique<RuntimeScheduler>(runtimeExecutor);
+
+    auto eventBeat = std::make_unique<EventBeat>(
+        std::make_shared<EventBeat::OwnerBox>(), *runtimeScheduler_);
+    auto eventQueueProcessor = EventQueueProcessor(
+        [](jsi::Runtime&,
+           EventTarget*,
+           const std::string&,
+           ReactEventPriority,
+           const EventPayload&,
+           HighResTimeStamp) {},
+        [](jsi::Runtime&) {},
+        [](const StateUpdate&) {},
+        {});
+    eventDispatcher_ = std::make_shared<EventDispatcher>(
+        eventQueueProcessor,
+        std::move(eventBeat),
+        [](const StateUpdate&) {},
+        std::weak_ptr<EventLogger>{});
+
+    listener_ = std::make_shared<EventListener>(
+        [this](const RawEvent& event) {
+          events_.push_back({event.type, event.eventPayload});
+          return true;
+        });
+    eventDispatcher_->addListener(listener_);
+  }
+
+  void expectLine(
+      const jsi::Array& lines,
+      size_t index,
+      const LineMeasurement& expected) {
+    auto line = lines.getValueAtIndex(*runtime_, index).asObject(*runtime_);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "text")
+            .asString(*runtime_)
+            .utf8(*runtime_),
+        expected.text);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "x").asNumber(), expected.frame.origin.x);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "y").asNumber(), expected.frame.origin.y);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "width").asNumber(),
+        expected.frame.size.width);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "height").asNumber(),
+        expected.frame.size.height);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "descender").asNumber(),
+        expected.descender);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "capHeight").asNumber(),
+        expected.capHeight);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "ascender").asNumber(),
+        expected.ascender);
+    EXPECT_EQ(
+        line.getProperty(*runtime_, "xHeight").asNumber(), expected.xHeight);
+  }
+
+  std::unique_ptr<facebook::hermes::HermesRuntime> runtime_;
+  std::unique_ptr<RuntimeScheduler> runtimeScheduler_;
+  std::shared_ptr<EventDispatcher> eventDispatcher_;
+  std::shared_ptr<const EventListener> listener_;
+  std::vector<CapturedEvent> events_;
+};
+
+TEST_F(
+    ParagraphEventEmitterTest,
+    testOnTextLayoutSerializesEveryLineMeasurement) {
+  const LinesMeasurements measurements{
+      {"First line", {{1.25, 2.5}, {30.75, 10.5}}, -2.25, 7.5, 8.25, 4.5},
+      {"Second line", {{3.5, 13.75}, {42.25, 11.5}}, -1.5, 8.0, 9.75, 5.25},
+  };
+  ParagraphEventEmitter eventEmitter(nullptr, eventDispatcher_);
+
+  eventEmitter.onTextLayout(measurements);
+
+  ASSERT_EQ(events_.size(), 1);
+  EXPECT_EQ(events_[0].type, "topTextLayout");
+  auto payload = events_[0].payload->asJSIValue(*runtime_).asObject(*runtime_);
+  auto lines = payload.getProperty(*runtime_, "lines")
+                   .asObject(*runtime_)
+                   .asArray(*runtime_);
+  ASSERT_EQ(lines.size(*runtime_), measurements.size());
+  expectLine(lines, 0, measurements[0]);
+  expectLine(lines, 1, measurements[1]);
+}
+
+TEST_F(
+    ParagraphEventEmitterTest,
+    testOnTextLayoutSuppressesIdenticalMeasurementsButDispatchesChanges) {
+  const LinesMeasurements measurements{
+      {"Line", {{1, 2}, {30, 10}}, -2, 7, 8, 4},
+  };
+  auto changedMeasurements = measurements;
+  changedMeasurements[0].xHeight = 5;
+  ParagraphEventEmitter eventEmitter(nullptr, eventDispatcher_);
+
+  eventEmitter.onTextLayout(measurements);
+  ASSERT_EQ(events_.size(), 1);
+
+  eventEmitter.onTextLayout(measurements);
+  ASSERT_EQ(events_.size(), 1);
+
+  eventEmitter.onTextLayout(changedMeasurements);
+  ASSERT_EQ(events_.size(), 2);
+  auto payload = events_[1].payload->asJSIValue(*runtime_).asObject(*runtime_);
+  auto lines = payload.getProperty(*runtime_, "lines")
+                   .asObject(*runtime_)
+                   .asArray(*runtime_);
+  ASSERT_EQ(lines.size(*runtime_), changedMeasurements.size());
+  auto line = lines.getValueAtIndex(*runtime_, 0).asObject(*runtime_);
+  EXPECT_EQ(
+      line.getProperty(*runtime_, "xHeight").asNumber(),
+      changedMeasurements[0].xHeight);
+}
+
+TEST_F(
+    ParagraphEventEmitterTest,
+    testOnTextLayoutDispatchesTransitionToEmptyMeasurements) {
+  const LinesMeasurements measurements{
+      {"Removed line", {{1, 2}, {30, 10}}, -2, 7, 8, 4},
+  };
+  ParagraphEventEmitter eventEmitter(nullptr, eventDispatcher_);
+
+  eventEmitter.onTextLayout(measurements);
+  ASSERT_EQ(events_.size(), 1);
+
+  eventEmitter.onTextLayout({});
+  ASSERT_EQ(events_.size(), 2);
+  auto payload = events_[1].payload->asJSIValue(*runtime_).asObject(*runtime_);
+  auto lines = payload.getProperty(*runtime_, "lines")
+                   .asObject(*runtime_)
+                   .asArray(*runtime_);
+  EXPECT_EQ(lines.size(*runtime_), 0);
+
+  eventEmitter.onTextLayout({});
+  EXPECT_EQ(events_.size(), 2);
+}
+
+} // namespace
+
+} // namespace facebook::react