Provide an override for Webview drop effect.

Used for gears file drag & drop in chrome, provide a setter api to override
the default webview drop effect.  If gears overrides the drop_effect, then
either a "copy" or "none" cursor is shown to the user.  Otherwise, the drop
effect shown is the default for the webview (controlled by WebKit).

Also remove a TODO: during drag and drop, remember the drop accept state of
the webview (in drag enter, drag over).  Use that to prevent drops on webviews
that can't accept the drop data.

BUG=7995

Original patch from Noel Gordon via
http://codereview.chromium.org/67297

Review URL: http://codereview.chromium.org/88073


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14162 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 13 insertions, 0 deletions

diff --git a/webkit/glue/webview_impl.h b/webkit/glue/webview_impl.h
index 5b3565b..9080bf4 100644
--- a/webkit/glue/webview_impl.h
+++ b/webkit/glue/webview_impl.h
@@ -114,6 +114,7 @@ class WebViewImpl : public WebView, public base::RefCounted<WebViewImpl> {
       const WebKit::WebPoint& client_point,
       const WebKit::WebPoint& screen_point);
   virtual int32 GetDragIdentity();
+  virtual bool SetDropEffect(bool accept);
   virtual void AutofillSuggestionsForNode(
       int64 node_id,
       const std::vector<std::wstring>& suggestions,
@@ -323,6 +324,18 @@ class WebViewImpl : public WebView, public base::RefCounted<WebViewImpl> {
   // copied from the WebDropData object sent from the browser process.
   int32 drag_identity_;
 
+  // Valid when drag_target_dispatch_ is true.  Used to override the default
+  // browser drop effect with the effects "copy" or "none".
+  enum DragTargetDropEffect {
+    DROP_EFFECT_DEFAULT = 0,
+    DROP_EFFECT_COPY,
+    DROP_EFFECT_NONE
+  } drop_effect_;
+
+  // When true, the drag data can be dropped onto the current drop target in
+  // this WebView (the drop target can accept the drop).
+  bool drop_accept_;
+
   // The autocomplete popup.  Kept around and reused every-time new suggestions
   // should be shown.
   RefPtr<WebCore::PopupContainer> autocomplete_popup_;