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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CONTENT_BROWSER_ANDROID_CONTEXT_SELECTION_CLIENT_H_ |
| 6 #define CONTENT_BROWSER_ANDROID_CONTEXT_SELECTION_CLIENT_H_ |
| 7 |
| 8 #include <jni.h> |
| 9 |
| 10 #include "base/android/jni_weak_ref.h" |
| 11 #include "base/macros.h" |
| 12 #include "base/memory/weak_ptr.h" |
| 13 #include "base/strings/string16.h" |
| 14 |
| 15 namespace content { |
| 16 |
| 17 class WebContents; |
| 18 |
| 19 // The native portion of Java ContextSelectionClient. |
| 20 // This class performs one operation: retrieves the selected text together with |
| 21 // its surrounding context from WebContents. This surrounding text is obtained |
| 22 // asynchronously from the current focused frame and passed back to Java layer. |
| 23 class ContextSelectionClient { |
| 24 public: |
| 25 ContextSelectionClient(JNIEnv* env, |
| 26 const base::android::JavaRef<jobject>& obj, |
| 27 WebContents* web_contents); |
| 28 ~ContextSelectionClient(); |
| 29 |
| 30 // Sends asynchronius request to retrieve the text. |
| 31 void RequestSurroundingText(JNIEnv* env, |
| 32 const base::android::JavaParamRef<jobject>& obj, |
| 33 int num_extra_characters, |
| 34 int callback_data); |
| 35 |
| 36 // Cancels all pending requests. |
| 37 void CancelAllRequests(JNIEnv* env, |
| 38 const base::android::JavaParamRef<jobject>& obj); |
| 39 |
| 40 private: |
| 41 void OnSurroundingTextReceived(int callback_data, |
| 42 const base::string16& text, |
| 43 int start, |
| 44 int end); |
| 45 |
| 46 // A weak reference to the Java ContentSelectionClient object. |
| 47 JavaObjectWeakGlobalRef java_ref_; |
| 48 |
| 49 // WebContents is used to find the relevant RenderFrameHost that can send |
| 50 // the request for the text. |
| 51 WebContents* web_contents_; |
| 52 |
| 53 base::WeakPtrFactory<ContextSelectionClient> weak_ptr_factory_; |
| 54 |
| 55 DISALLOW_COPY_AND_ASSIGN(ContextSelectionClient); |
| 56 }; |
| 57 |
| 58 bool RegisterContextSelectionClient(JNIEnv* env); |
| 59 |
| 60 } // namespace content |
| 61 |
| 62 #endif // CONTENT_BROWSER_ANDROID_CONTEXT_SELECTION_CLIENT_H_ |
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