Support dragging texts into Android WebView.

content/browser/android/content_view_core_impl.cc

 // Copyright 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/android/content_view_core_impl.h"
 
 #include <stddef.h>
 
 #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/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/output/begin_frame_args.h"
 #include "content/browser/accessibility/browser_accessibility_manager_android.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
 #include "content/browser/android/gesture_event_type.h"
 #include "content/browser/android/interstitial_page_delegate_android.h"
 #include "content/browser/android/java/gin_java_bridge_dispatcher_host.h"
@@ skipping 18 matching lines @@
 #include "content/public/browser/favicon_status.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/screen_orientation_dispatcher_host.h"
 #include "content/public/browser/ssl_host_state_delegate.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/menu_item.h"
 #include "content/public/common/user_agent.h"
 #include "jni/ContentViewCore_jni.h"
+#include "jni/DragEvent_jni.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
+#include "ui/base/clipboard/clipboard.h"
 #include "ui/events/android/motion_event_android.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/geometry/size_f.h"
 
 using base::android::AttachCurrentThread;
 using base::android::ConvertJavaStringToUTF16;
@@ skipping 1398 matching lines @@
                                               const JavaParamRef<jobject>& jobj,
                                               jboolean opaque) {
   if (GetRenderWidgetHostViewAndroid()) {
     if (opaque)
       GetRenderWidgetHostViewAndroid()->SetBackgroundColorToDefault();
     else
       GetRenderWidgetHostViewAndroid()->SetBackgroundColor(SK_ColorTRANSPARENT);
   }
 }
 
+void ContentViewCoreImpl::OnDragEvent(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobj,
+    jint action,
+    jint x,
+    jint y,
+    jint screen_x,
+    jint screen_y,
+    const base::android::JavaParamRef<jobjectArray>& j_mimeTypes,
+    const base::android::JavaParamRef<jstring>& j_content) {
+  WebContentsViewAndroid* wcva = static_cast<WebContentsViewAndroid*>(
+      static_cast<WebContentsImpl*>(web_contents())->GetView());
+
+  const gfx::Point location(x, y);
+  const gfx::Point screen_location(screen_x, screen_y);
+
+  std::vector<base::string16> mime_types;
+  base::android::AppendJavaStringArrayToStringVector(env, j_mimeTypes,
+                                                     &mime_types);
+  switch (action) {
+    case JNI_DragEvent::ACTION_DRAG_ENTERED: {
+      std::vector<DropData::Metadata> metadata;
+      for (const base::string16& mime_type : mime_types) {
+        metadata.push_back(DropData::Metadata::CreateForMimeType(
+            DropData::Kind::STRING, mime_type));
+      }
+      wcva->OnDragEntered(metadata, location, screen_location);
+      break;
+    }
+    case JNI_DragEvent::ACTION_DRAG_LOCATION: {
+      wcva->OnDragUpdated(location, screen_location);
+      break;
+    }
+    case JNI_DragEvent::ACTION_DROP: {
+      base::string16 text_to_drop = ConvertJavaStringToUTF16(env, j_content);
+      DropData drop_data;
+      drop_data.did_originate_from_renderer = false;
+      for (const base::string16& mime_type : mime_types) {
+        if (base::EqualsASCII(mime_type, ui::Clipboard::kMimeTypeURIList)) {
+          drop_data.url = GURL(text_to_drop);
+        } else if (base::EqualsASCII(mime_type, ui::Clipboard::kMimeTypeText)) {
+          drop_data.text = base::NullableString16(text_to_drop, false);
+        } else {
+          drop_data.html = base::NullableString16(text_to_drop, false);
+        }
+      }
+
+      wcva->OnPerformDrop(&drop_data, location, screen_location);
+      break;
+    }
+    case JNI_DragEvent::ACTION_DRAG_EXITED:
+      wcva->OnDragExited();
+      break;
+    default:  // STARTED and ENDED. Nothing meaningful to do.
+      break;
+  }
+}
+
 void ContentViewCoreImpl::RequestTextSurroundingSelection(
     int max_length,
     const base::Callback<
         void(const base::string16& content, int start_offset, int end_offset)>&
         callback) {
   DCHECK(!callback.is_null());
   RenderFrameHost* focused_frame = web_contents_->GetFocusedFrame();
   if (!focused_frame)
     return;
   if (GetRenderWidgetHostViewAndroid()) {
@@ skipping 91 matching lines @@
     return ScopedJavaLocalRef<jobject>();
 
   ContentViewCore* view = ContentViewCore::FromWebContents(web_contents);
   if (!view)
     return ScopedJavaLocalRef<jobject>();
 
   return view->GetJavaObject();
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
-  return RegisterNativesImpl(env);
+  return RegisterNativesImpl(env) && JNI_DragEvent::RegisterNativesImpl(env);
 }
 
 }  // namespace content