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"
@@ skipping 36 matching lines @@
 #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 "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
+#include "ui/base/dragdrop/drop_target_event.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_android.h"
 #include "ui/events/android/motion_event_android.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;
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF16ToJavaString;
@@ skipping 14 matching lines @@
   // Popup item is of type group
   POPUP_ITEM_TYPE_GROUP,
 
   // Popup item is disabled
   POPUP_ITEM_TYPE_DISABLED,
 
   // Popup item is enabled
   POPUP_ITEM_TYPE_ENABLED,
 };
 
+enum DragEventActions {
+  ACTION_DRAG_STARTED = 1,
+  ACTION_DRAG_LOCATION,
+  ACTION_DROP,
+  ACTION_DRAG_ENDED,
+  ACTION_DRAG_ENTERED,
+  ACTION_DRAG_EXITED,
+};
+
 const void* const kContentViewUserDataKey = &kContentViewUserDataKey;
 
 int GetRenderProcessIdFromRenderViewHost(RenderViewHost* host) {
   DCHECK(host);
   RenderProcessHost* render_process = host->GetProcess();
   DCHECK(render_process);
   if (render_process->HasConnection())
     return render_process->GetHandle();
   return 0;
 }
@@ skipping 1301 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,
+    int action,
+    const JavaParamRef<jintArray>& j_locations,
+    const base::android::JavaParamRef<jstring>& content) {
+  WebContentsViewAndroid* wcva = static_cast<WebContentsViewAndroid*>(
+      static_cast<WebContentsImpl*>(web_contents())->GetView());
+
+  std::vector<int> locations;
+  base::android::JavaIntArrayToIntVector(env, j_locations, &locations);
+  int x = locations[0];
+  int y = locations[1];
+  int screen_x = locations[2];
+  int screen_y = locations[3];
+
+  switch (action) {
+    case ACTION_DRAG_ENTERED: {
+      ui::OSExchangeData data(new ui::OSExchangeDataProviderAndroid());
+      // Text being dragged is not available when drag enters. Use an empty
+      // string to declare that the DropData contains string. The DropData will
+      // be updated with real string being dragged during ACTION_DROP.
+      data.SetString(base::string16());
+      ui::DropTargetEvent event(data, gfx::Point(x, y),
+                                gfx::Point(screen_x, screen_y),
+                                ui::DragDropTypes::DRAG_COPY);
+
+      wcva->OnDragEntered(event);
+      break;
+    }
+    case ACTION_DRAG_LOCATION: {
+      ui::OSExchangeData data(new ui::OSExchangeDataProviderAndroid());
+      ui::DropTargetEvent event(data, gfx::Point(x, y),
+                                gfx::Point(screen_x, screen_y),
+                                ui::DragDropTypes::DRAG_COPY);
+
+      wcva->OnDragUpdated(event);
+      break;
+    }
+    case ACTION_DROP: {
+      base::string16 text_to_drop = ConvertJavaStringToUTF16(env, content);
+      ui::OSExchangeData data(new ui::OSExchangeDataProviderAndroid());
+      data.SetString(text_to_drop);
+      ui::DropTargetEvent event(data, gfx::Point(x, y),
+                                gfx::Point(screen_x, screen_y),
+                                ui::DragDropTypes::DRAG_COPY);
+
+      wcva->OnPerformDrop(event);
+      break;
+    }
+    case ACTION_DRAG_EXITED:
+      wcva->OnDragExited();
+      break;
+    case ACTION_DRAG_ENDED:
+      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 99 matching lines @@
     return ScopedJavaLocalRef<jobject>();
 
   return view->GetJavaObject();
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content