Drag-and-drop: DragEnter, DragOver, DragLeave, DragDrop

third_party/WebKit/public/web/WebFrameWidget.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebFrameWidget_h
 #define WebFrameWidget_h
 
 #include "../platform/WebCommon.h"
+#include "../platform/WebDragOperation.h"
 #include "../platform/WebPageVisibilityState.h"
 #include "public/web/WebWidget.h"
 
 namespace blink {
 
+class WebDragData;
 class WebLocalFrame;
 class WebInputMethodController;
 class WebView;
 class WebWidgetClient;
 
 class WebFrameWidget : public WebWidget {
  public:
   BLINK_EXPORT static WebFrameWidget* create(WebWidgetClient*, WebLocalFrame*);
   // Creates a frame widget for a WebView. Temporary helper to help transition
   // away from WebView inheriting WebWidget.
@@ skipping 17 matching lines @@
   // effect the default background color used for pages with no
   // background-color style in effect, or used as the alpha-blended basis for
   // any pages with translucent background-color style. (For pages with opaque
   // background-color style, this property is effectively ignored).
   // Setting this takes effect for the currently loaded page, if any, and
   // persists across subsequent navigations. Defaults to white prior to the
   // first call to this method.
   virtual void setBaseBackgroundColor(WebColor) = 0;
 
   // Returns the local root of this WebFrameWidget.
-  virtual WebLocalFrame* localRoot() = 0;
+  virtual WebLocalFrame* localRoot() const = 0;
 
   // WebWidget implementation.
   bool isWebFrameWidget() const final { return true; }
 
   // Current instance of the active WebInputMethodController, that is, the
   // WebInputMethodController corresponding to (and owned by) the focused
   // WebLocalFrameImpl. It might return nullptr when there are no focused
   // frames or possibly when the WebFrameWidget does not accept IME events.
   virtual WebInputMethodController* getActiveWebInputMethodController()
       const = 0;
+
+  // Callback methods when a drag-and-drop operation is trying to drop something
+  // on the WebWidget.
+  virtual WebDragOperation dragTargetDragEnter(
+      const WebDragData&,
+      const WebPoint& pointInViewport,
+      const WebPoint& screenPoint,
+      WebDragOperationsMask operationsAllowed,
+      int modifiers) = 0;
+  virtual WebDragOperation dragTargetDragOver(
+      const WebPoint& pointInViewport,
+      const WebPoint& screenPoint,
+      WebDragOperationsMask operationsAllowed,
+      int modifiers) = 0;
+  virtual void dragTargetDragLeave() = 0;
+  virtual void dragTargetDrop(const WebDragData&,
+                              const WebPoint& pointInViewport,
+                              const WebPoint& screenPoint,
+                              int modifiers) = 0;
 };
 
 }  // namespace blink
 
 #endif