Mac: Add support for disabling HTML5 drag&drop by setting CefBrowserSettings.drag_drop_disabled to true (issue #140).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@270 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser_impl_mac.mm

@@ -94,6 +94,9 @@ void CefBrowserImpl::UIT_CreateBrowser(const CefString& url)
   browserView.browser = this;
   window_info_.m_View = browserView;
 
+  if (!settings_.drag_drop_disabled)
+    [browserView registerDragDrop];
+
   Unlock();
 
   if (newWnd != nil && !window_info_.m_bHidden) {

libcef/browser_webview_delegate_mac.mm

@@ -125,6 +125,11 @@ void BrowserWebViewDelegate::startDragging(const WebDragData& data,
                                            WebDragOperationsMask mask,
                                            const WebImage& image,
                                            const WebPoint& image_offset) {
+  if (browser_->settings().drag_drop_disabled) {
+    browser_->UIT_GetWebView()->dragSourceSystemDragEnded();
+    return;
+  }
+
   WebWidgetHost* host = GetWidgetHost();
   if (!host)
     return;

libcef/browser_webview_mac.h

@@ -40,6 +40,9 @@ struct WebDropData;
 - (BOOL)isOpaque;
 - (void)setFrame:(NSRect)frameRect;
 
+// Register this WebView as a drag/drop target.
+- (void)registerDragDrop;
+
 // Called from BrowserWebViewDelegate::startDragging() to initiate dragging.
 - (void)startDragWithDropData:(const WebDropData&)dropData
             dragOperationMask:(NSDragOperation)operationMask

libcef/browser_webview_mac.mm

@@ -25,13 +25,6 @@
 - (id)initWithFrame:(NSRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
-    dropTarget_.reset([[WebDropTarget alloc] initWithWebView:self]);
-
-    // Register the view to handle the appropriate drag types.
-    NSArray* types = [NSArray arrayWithObjects:NSStringPboardType,
-                      NSHTMLPboardType, NSURLPboardType, nil];
-    [self registerForDraggedTypes:types];
-
     trackingArea_ =
         [[NSTrackingArea alloc] initWithRect:frame
                                      options:NSTrackingMouseMoved |
@@ -187,6 +180,15 @@
   [self setNeedsDisplay:YES];
 }
 
+- (void)registerDragDrop {
+  dropTarget_.reset([[WebDropTarget alloc] initWithWebView:self]);
+
+  // Register the view to handle the appropriate drag types.
+  NSArray* types = [NSArray arrayWithObjects:NSStringPboardType,
+                    NSHTMLPboardType, NSURLPboardType, nil];
+  [self registerForDraggedTypes:types]; 
+}
+
 - (void)startDragWithDropData:(const WebDropData&)dropData
             dragOperationMask:(NSDragOperation)operationMask
                         image:(NSImage*)image