Revert of Let ImeAdapterAndroid have the same lifecycle as its Java peer

content/browser/renderer_host/ime_adapter_android.cc

Index: content/browser/renderer_host/ime_adapter_android.cc
diff --git a/content/browser/renderer_host/ime_adapter_android.cc b/content/browser/renderer_host/ime_adapter_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b63f0652c70e6a717e26c8a6d44fe7c7d491ad48
--- /dev/null
+++ b/content/browser/renderer_host/ime_adapter_android.cc
@@ -0,0 +1,364 @@
+// Copyright (c) 2012 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 "content/browser/renderer_host/ime_adapter_android.h"
+
+#include <algorithm>
+#include <android/input.h>
+#include <vector>
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_array.h"
+#include "base/android/jni_string.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/time/time.h"
+#include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/renderer_host/render_view_host_delegate.h"
+#include "content/browser/renderer_host/render_widget_host_impl.h"
+#include "content/browser/renderer_host/render_widget_host_view_android.h"
+#include "content/common/input_messages.h"
+#include "content/common/view_messages.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/native_web_keyboard_event.h"
+#include "content/public/browser/web_contents.h"
+#include "jni/ImeAdapter_jni.h"
+#include "third_party/WebKit/public/platform/WebInputEvent.h"
+#include "third_party/WebKit/public/platform/WebTextInputType.h"
+#include "third_party/WebKit/public/web/WebCompositionUnderline.h"
+
+using base::android::AttachCurrentThread;
+using base::android::ConvertJavaStringToUTF16;
+using base::android::JavaParamRef;
+
+namespace content {
+namespace {
+
+// Maps a java KeyEvent into a NativeWebKeyboardEvent.
+// |java_key_event| is used to maintain a globalref for KeyEvent.
+// |type| will determine the WebInputEvent type.
+// type, |modifiers|, |time_ms|, |key_code|, |unicode_char| is used to create
+// WebKeyboardEvent. |key_code| is also needed ad need to treat the enter key
+// as a key press of character \r.
+NativeWebKeyboardEvent NativeWebKeyboardEventFromKeyEvent(
+    JNIEnv* env,
+    const base::android::JavaRef<jobject>& java_key_event,
+    int type,
+    int modifiers,
+    jlong time_ms,
+    int key_code,
+    int scan_code,
+    bool is_system_key,
+    int unicode_char) {
+  return NativeWebKeyboardEvent(env, java_key_event,
+                                static_cast<blink::WebInputEvent::Type>(type),
+                                modifiers, time_ms / 1000.0, key_code,
+                                scan_code, unicode_char, is_system_key);
+}
+
+}  // anonymous namespace
+
+bool RegisterImeAdapter(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+// Callback from Java to convert BackgroundColorSpan data to a
+// blink::WebCompositionUnderline instance, and append it to |underlines_ptr|.
+void AppendBackgroundColorSpan(JNIEnv*,
+                               const JavaParamRef<jclass>&,
+                               jlong underlines_ptr,
+                               jint start,
+                               jint end,
+                               jint background_color) {
+  DCHECK_GE(start, 0);
+  DCHECK_GE(end, 0);
+  // Do not check |background_color|.
+  std::vector<blink::WebCompositionUnderline>* underlines =
+      reinterpret_cast<std::vector<blink::WebCompositionUnderline>*>(
+          underlines_ptr);
+  underlines->push_back(
+      blink::WebCompositionUnderline(static_cast<unsigned>(start),
+                                     static_cast<unsigned>(end),
+                                     SK_ColorTRANSPARENT,
+                                     false,
+                                     static_cast<unsigned>(background_color)));
+}
+
+// Callback from Java to convert UnderlineSpan data to a
+// blink::WebCompositionUnderline instance, and append it to |underlines_ptr|.
+void AppendUnderlineSpan(JNIEnv*,
+                         const JavaParamRef<jclass>&,
+                         jlong underlines_ptr,
+                         jint start,
+                         jint end) {
+  DCHECK_GE(start, 0);
+  DCHECK_GE(end, 0);
+  std::vector<blink::WebCompositionUnderline>* underlines =
+      reinterpret_cast<std::vector<blink::WebCompositionUnderline>*>(
+          underlines_ptr);
+  underlines->push_back(
+      blink::WebCompositionUnderline(static_cast<unsigned>(start),
+                                     static_cast<unsigned>(end),
+                                     SK_ColorBLACK,
+                                     false,
+                                     SK_ColorTRANSPARENT));
+}
+
+ImeAdapterAndroid::ImeAdapterAndroid(RenderWidgetHostViewAndroid* rwhva)
+    : rwhva_(rwhva) {
+  DCHECK(rwhva_);
+}
+
+ImeAdapterAndroid::~ImeAdapterAndroid() {
+  JNIEnv* env = AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jobject> obj = java_ime_adapter_.get(env);
+  if (!obj.is_null())
+    Java_ImeAdapter_detach(env, obj);
+}
+
+bool ImeAdapterAndroid::SendKeyEvent(
+    JNIEnv* env,
+    const JavaParamRef<jobject>&,
+    const JavaParamRef<jobject>& original_key_event,
+    int type,
+    int modifiers,
+    jlong time_ms,
+    int key_code,
+    int scan_code,
+    bool is_system_key,
+    int unicode_char) {
+  NativeWebKeyboardEvent event = NativeWebKeyboardEventFromKeyEvent(
+      env, original_key_event, type, modifiers, time_ms, key_code, scan_code,
+      is_system_key, unicode_char);
+  rwhva_->SendKeyEvent(event);
+  return true;
+}
+
+void ImeAdapterAndroid::SetComposingText(JNIEnv* env,
+                                         const JavaParamRef<jobject>& obj,
+                                         const JavaParamRef<jobject>& text,
+                                         const JavaParamRef<jstring>& text_str,
+                                         int relative_cursor_pos) {
+  RenderWidgetHostImpl* rwhi = GetFocusedWidget();
+  if (!rwhi)
+    return;
+
+  base::string16 text16 = ConvertJavaStringToUTF16(env, text_str);
+
+  std::vector<blink::WebCompositionUnderline> underlines =
+      GetUnderlinesFromSpans(env, obj, text, text16);
+
+  // Default to plain underline if we didn't find any span that we care about.
+  if (underlines.empty()) {
+    underlines.push_back(blink::WebCompositionUnderline(
+        0, text16.length(), SK_ColorBLACK, false, SK_ColorTRANSPARENT));
+  }
+
+  // relative_cursor_pos is as described in the Android API for
+  // InputConnection#setComposingText, whereas the parameters for
+  // ImeSetComposition are relative to the start of the composition.
+  if (relative_cursor_pos > 0)
+    relative_cursor_pos = text16.length() + relative_cursor_pos - 1;
+
+  rwhi->ImeSetComposition(text16, underlines, gfx::Range::InvalidRange(),
+                          relative_cursor_pos, relative_cursor_pos);
+}
+
+void ImeAdapterAndroid::CommitText(JNIEnv* env,
+                                   const JavaParamRef<jobject>& obj,
+                                   const JavaParamRef<jobject>& text,
+                                   const JavaParamRef<jstring>& text_str,
+                                   int relative_cursor_pos) {
+  RenderWidgetHostImpl* rwhi = GetFocusedWidget();
+  if (!rwhi)
+    return;
+
+  base::string16 text16 = ConvertJavaStringToUTF16(env, text_str);
+
+  std::vector<blink::WebCompositionUnderline> underlines =
+      GetUnderlinesFromSpans(env, obj, text, text16);
+
+  // relative_cursor_pos is as described in the Android API for
+  // InputConnection#commitText, whereas the parameters for
+  // ImeConfirmComposition are relative to the end of the composition.
+  if (relative_cursor_pos > 0)
+    relative_cursor_pos--;
+  else
+    relative_cursor_pos -= text16.length();
+
+  rwhi->ImeCommitText(text16, underlines, gfx::Range::InvalidRange(),
+                      relative_cursor_pos);
+}
+
+void ImeAdapterAndroid::FinishComposingText(JNIEnv* env,
+                                            const JavaParamRef<jobject>&) {
+  RenderWidgetHostImpl* rwhi = GetFocusedWidget();
+  if (!rwhi)
+    return;
+
+  rwhi->ImeFinishComposingText(true);
+}
+
+void ImeAdapterAndroid::AttachImeAdapter(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& java_object) {
+  java_ime_adapter_ = JavaObjectWeakGlobalRef(env, java_object);
+}
+
+void ImeAdapterAndroid::CancelComposition() {
+  base::android::ScopedJavaLocalRef<jobject> obj =
+      java_ime_adapter_.get(AttachCurrentThread());
+  if (!obj.is_null())
+    Java_ImeAdapter_cancelComposition(AttachCurrentThread(), obj);
+}
+
+void ImeAdapterAndroid::FocusedNodeChanged(bool is_editable_node) {
+  base::android::ScopedJavaLocalRef<jobject> obj =
+      java_ime_adapter_.get(AttachCurrentThread());
+  if (!obj.is_null()) {
+    Java_ImeAdapter_focusedNodeChanged(AttachCurrentThread(), obj,
+                                       is_editable_node);
+  }
+}
+
+void ImeAdapterAndroid::SetEditableSelectionOffsets(
+    JNIEnv*,
+    const JavaParamRef<jobject>&,
+    int start,
+    int end) {
+  RenderFrameHost* rfh = GetFocusedFrame();
+  if (!rfh)
+    return;
+
+  rfh->Send(new InputMsg_SetEditableSelectionOffsets(rfh->GetRoutingID(), start,
+                                                     end));
+}
+
+void ImeAdapterAndroid::SetCharacterBounds(
+    const std::vector<gfx::RectF>& character_bounds) {
+  JNIEnv* env = AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jobject> obj = java_ime_adapter_.get(env);
+  if (obj.is_null())
+    return;
+
+  const size_t coordinates_array_size = character_bounds.size() * 4;
+  std::unique_ptr<float[]> coordinates_array(new float[coordinates_array_size]);
+  for (size_t i = 0; i < character_bounds.size(); ++i) {
+    const gfx::RectF& rect = character_bounds[i];
+    const size_t coordinates_array_index = i * 4;
+    coordinates_array[coordinates_array_index + 0] = rect.x();
+    coordinates_array[coordinates_array_index + 1] = rect.y();
+    coordinates_array[coordinates_array_index + 2] = rect.right();
+    coordinates_array[coordinates_array_index + 3] = rect.bottom();
+  }
+  Java_ImeAdapter_setCharacterBounds(
+      env, obj, base::android::ToJavaFloatArray(env, coordinates_array.get(),
+                                                coordinates_array_size));
+}
+
+void ImeAdapterAndroid::SetComposingRegion(JNIEnv*,
+                                           const JavaParamRef<jobject>&,
+                                           int start,
+                                           int end) {
+  RenderFrameHost* rfh = GetFocusedFrame();
+  if (!rfh)
+    return;
+
+  std::vector<blink::WebCompositionUnderline> underlines;
+  underlines.push_back(blink::WebCompositionUnderline(
+      0, end - start, SK_ColorBLACK, false, SK_ColorTRANSPARENT));
+
+  rfh->Send(new InputMsg_SetCompositionFromExistingText(
+      rfh->GetRoutingID(), start, end, underlines));
+}
+
+void ImeAdapterAndroid::DeleteSurroundingText(JNIEnv*,
+                                              const JavaParamRef<jobject>&,
+                                              int before,
+                                              int after) {
+  RenderFrameHostImpl* rfh =
+      static_cast<RenderFrameHostImpl*>(GetFocusedFrame());
+  if (rfh)
+    rfh->DeleteSurroundingText(before, after);
+}
+
+void ImeAdapterAndroid::DeleteSurroundingTextInCodePoints(
+    JNIEnv*,
+    const JavaParamRef<jobject>&,
+    int before,
+    int after) {
+  RenderFrameHostImpl* rfh =
+      static_cast<RenderFrameHostImpl*>(GetFocusedFrame());
+  if (rfh)
+    rfh->DeleteSurroundingTextInCodePoints(before, after);
+}
+
+bool ImeAdapterAndroid::RequestTextInputStateUpdate(
+    JNIEnv* env,
+    const JavaParamRef<jobject>&) {
+  RenderWidgetHostImpl* rwhi = GetFocusedWidget();
+  if (!rwhi)
+    return false;
+  rwhi->Send(new InputMsg_RequestTextInputStateUpdate(rwhi->GetRoutingID()));
+  return true;
+}
+
+void ImeAdapterAndroid::RequestCursorUpdate(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj,
+    bool immediate_request,
+    bool monitor_request) {
+  RenderWidgetHostImpl* rwhi = GetFocusedWidget();
+  if (!rwhi)
+    return;
+  rwhi->Send(new InputMsg_RequestCompositionUpdates(
+      rwhi->GetRoutingID(), immediate_request, monitor_request));
+}
+
+void ImeAdapterAndroid::ResetImeAdapter(JNIEnv* env,
+                                        const JavaParamRef<jobject>&) {
+  java_ime_adapter_.reset();
+}
+
+RenderWidgetHostImpl* ImeAdapterAndroid::GetFocusedWidget() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  return rwhva_->GetFocusedWidget();
+}
+
+RenderFrameHost* ImeAdapterAndroid::GetFocusedFrame() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  // We get the focused frame from the WebContents of the page. Although
+  // |rwhva_->GetFocusedWidget()| does a similar thing, there is no direct way
+  // to get a RenderFrameHost from its RWH.
+  RenderWidgetHostImpl* rwh =
+      RenderWidgetHostImpl::From(rwhva_->GetRenderWidgetHost());
+  if (!rwh || !rwh->delegate())
+    return nullptr;
+
+  if (auto* contents = rwh->delegate()->GetAsWebContents())
+    return contents->GetFocusedFrame();
+
+  return nullptr;
+}
+
+std::vector<blink::WebCompositionUnderline>
+ImeAdapterAndroid::GetUnderlinesFromSpans(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj,
+    const base::android::JavaParamRef<jobject>& text,
+    const base::string16& text16) {
+  std::vector<blink::WebCompositionUnderline> underlines;
+  // Iterate over spans in |text|, dispatch those that we care about (e.g.,
+  // BackgroundColorSpan) to a matching callback (e.g.,
+  // AppendBackgroundColorSpan()), and populate |underlines|.
+  Java_ImeAdapter_populateUnderlinesFromSpans(
+      env, obj, text, reinterpret_cast<jlong>(&underlines));
+
+  // Sort spans by |.startOffset|.
+  std::sort(underlines.begin(), underlines.end());
+
+  return underlines;
+}
+
+}  // namespace content