Support InputMethodManager#updateCursorAnchorInfo for Android 5.0 (C++ version)

ui/base/ime/android/cursor_anchor_info_builder.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/base/ime/android/cursor_anchor_info_builder.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/containers/mru_cache.h"
+#include "jni/CursorAnchorInfoBuilder_jni.h"
+
+namespace ui {
+namespace {
+
+using base::android::AttachCurrentThread;
+
+const size_t kComposingTextCacheSize = 2;
+
+class CursorAnchorInfoBuilderImpl final
+    : public CursorAnchorInfoBuilder {
+ public:
+  CursorAnchorInfoBuilderImpl();
+  ~CursorAnchorInfoBuilderImpl() override;
+
+  void AddCharacterBounds(int index,
+                          const gfx::RectF& rect,
+                          uint32 flags) override;
+  base::android::ScopedJavaLocalRef<jobject> Build() override;
+  void Reset() override;
+  void SetComposingText(int composingTextStart,
+                        base::StringPiece16 composingText) override;
+  void SetInsertionMarkerLocation(float horizontalPosition,
+                                  float lineTop,
+                                  float lineBaseline,
+                                  float lineBottom,
+                                  uint32 flags) override;
+  void SetScaleAndTranslate(float scale,
+                            const gfx::Vector2dF& translate) override;
+  void SetSelectionRange(const gfx::Range& range) override;
+
+  static bool Register(JNIEnv* env);
+
+ private:
+  base::android::ScopedJavaGlobalRef<jobject> builder_;
+  base::MRUCache<base::string16, base::android::ScopedJavaGlobalRef<jstring>>
+      composing_text_cache_;
+
+  DISALLOW_COPY_AND_ASSIGN(CursorAnchorInfoBuilderImpl);
+};
+
+CursorAnchorInfoBuilderImpl::CursorAnchorInfoBuilderImpl()
+    : builder_(Java_CursorAnchorInfoBuilder_create(AttachCurrentThread())),
+      composing_text_cache_(kComposingTextCacheSize) {
+}
+
+CursorAnchorInfoBuilderImpl::~CursorAnchorInfoBuilderImpl() {
+}
+
+void CursorAnchorInfoBuilderImpl::AddCharacterBounds(
+    int index, const gfx::RectF& rect, uint32 flags) {
+  JNIEnv* env = AttachCurrentThread();
+  Java_CursorAnchorInfoBuilder_addCharacterBounds(
+      env,
+      builder_.obj(),
+      index,
+      rect.x(),
+      rect.y(),
+      rect.right(),
+      rect.bottom(),
+      flags);
+}
+
+base::android::ScopedJavaLocalRef<jobject>
+CursorAnchorInfoBuilderImpl::Build() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_CursorAnchorInfoBuilder_build(env, builder_.obj());
+}
+
+void CursorAnchorInfoBuilderImpl::Reset() {
+  JNIEnv* env = AttachCurrentThread();
+  Java_CursorAnchorInfoBuilder_reset(env, builder_.obj());
+}
+
+void CursorAnchorInfoBuilderImpl::SetComposingText(
+    int composing_text_start, base::StringPiece16 composing_text) {
+  JNIEnv* env = AttachCurrentThread();
+  const auto& key = composing_text.as_string();
+  auto it = composing_text_cache_.Get(key);
+  if (it != composing_text_cache_.end()) {
+    Java_CursorAnchorInfoBuilder_setComposingText(
+        env, builder_.obj(), composing_text_start, it->second.obj());
+  } else {
+    auto jstr = base::android::ConvertUTF16ToJavaString(env, composing_text);
+    Java_CursorAnchorInfoBuilder_setComposingText(
+        env, builder_.obj(), composing_text_start, jstr.obj());
+    composing_text_cache_.Put(
+        key, base::android::ScopedJavaGlobalRef<jstring>(jstr));
+  }
+}
+
+void CursorAnchorInfoBuilderImpl::SetInsertionMarkerLocation(
+    float horizontalPosition,
+    float lineTop,
+    float lineBaseline,
+    float lineBottom,
+    uint32 flags) {
+  JNIEnv* env = AttachCurrentThread();
+  Java_CursorAnchorInfoBuilder_setInsertionMarkerLocation(
+      env,
+      builder_.obj(),
+      horizontalPosition,
+      lineTop,
+      lineBaseline,
+      lineBottom,
+      static_cast<jint>(flags));
+}
+
+void CursorAnchorInfoBuilderImpl::SetScaleAndTranslate(
+    float scale,
+    const gfx::Vector2dF& translate) {
+  JNIEnv* env = AttachCurrentThread();
+  Java_CursorAnchorInfoBuilder_setScaleAndTranslate(
+      env,
+      builder_.obj(),
+      scale,
+      translate.x(),
+      translate.y());
+}
+
+void CursorAnchorInfoBuilderImpl::SetSelectionRange(const gfx::Range& range) {
+  JNIEnv* env = AttachCurrentThread();
+  Java_CursorAnchorInfoBuilder_setSelectionRange(
+      env, builder_.obj(), range.start(), range.end());
+}
+
+}  // namespace
+
+CursorAnchorInfoBuilder::CursorAnchorInfoBuilder() {
+}
+
+CursorAnchorInfoBuilder::~CursorAnchorInfoBuilder() {
+}
+
+// static
+scoped_ptr<CursorAnchorInfoBuilder>
+CursorAnchorInfoBuilder::Create() {
+  return scoped_ptr<CursorAnchorInfoBuilder>(new CursorAnchorInfoBuilderImpl);
+}
+
+// static
+bool CursorAnchorInfoBuilder::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace ui