Initial implementation of Drag and Drop for the extension BMM.

Review URL: http://codereview.chromium.org/660139

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@40858 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 131 insertions, 0 deletions

diff --git a/chrome/browser/cocoa/web_contents_drag_source.mm b/chrome/browser/cocoa/web_contents_drag_source.mm
new file mode 100644
index 0000000..8bc883c
--- /dev/null
+++ b/chrome/browser/cocoa/web_contents_drag_source.mm
@@ -0,0 +1,131 @@
+// Copyright (c) 2010 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.
+
+#import "chrome/browser/cocoa/web_contents_drag_source.h"
+
+#include "base/file_path.h"
+#include "base/nsimage_cache_mac.h"
+#include "base/string_util.h"
+#include "base/sys_string_conversions.h"
+#include "chrome/browser/renderer_host/render_view_host.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/tab_contents/tab_contents_view_mac.h"
+
+namespace {
+
+// Make a drag image from the drop data.
+// TODO(feldstein): Make this work
+NSImage* MakeDragImage() {
+  // TODO(feldstein): Just a stub for now. Make it do something (see, e.g.,
+  // WebKit/WebKit/mac/Misc/WebNSViewExtras.m: |-_web_DragImageForElement:...|).
+
+  // Default to returning a generic image.
+  return nsimage_cache::ImageNamed(@"nav.pdf");
+}
+
+// Flips screen and point coordinates over the y axis to work with webkit
+// coordinate systems.
+void FlipPointCoordinates(NSPoint& screenPoint,
+                          NSPoint& localPoint,
+                          NSView* view) {
+  NSRect viewFrame = [view frame];
+  localPoint.y = NSHeight(viewFrame) - localPoint.y;
+  // Flip |screenPoint|.
+  NSRect screenFrame = [[[view window] screen] frame];
+  screenPoint.y = NSHeight(screenFrame) - screenPoint.y;
+}
+
+}  // namespace
+
+
+@implementation WebContentsDragSource
+
+- (id)initWithContentsView:(TabContentsViewCocoa*)contentsView
+                pasteboard:(NSPasteboard*)pboard
+         dragOperationMask:(NSDragOperation)dragOperationMask {
+  if ((self = [super init])) {
+    contentsView_ = contentsView;
+    DCHECK(contentsView_);
+
+    pasteboard_.reset([pboard retain]);
+    DCHECK(pasteboard_.get());
+
+    dragOperationMask_ = dragOperationMask;
+  }
+
+  return self;
+}
+
+- (NSImage*)dragImage {
+  return MakeDragImage();
+}
+
+- (void)fillPasteboard {
+  NOTIMPLEMENTED() << "Subclasses should implement fillPasteboard";
+}
+
+- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
+  return dragOperationMask_;
+}
+
+- (void)startDrag {
+  [self fillPasteboard];
+  NSEvent* currentEvent = [NSApp currentEvent];
+
+  // Synthesize an event for dragging, since we can't be sure that
+  // [NSApp currentEvent] will return a valid dragging event.
+  NSWindow* window = [contentsView_ window];
+  NSPoint position = [window mouseLocationOutsideOfEventStream];
+  NSTimeInterval eventTime = [currentEvent timestamp];
+  NSEvent* dragEvent = [NSEvent mouseEventWithType:NSLeftMouseDragged
+                                          location:position
+                                     modifierFlags:NSLeftMouseDraggedMask
+                                         timestamp:eventTime
+                                      windowNumber:[window windowNumber]
+                                           context:nil
+                                       eventNumber:0
+                                        clickCount:1
+                                          pressure:1.0];
+  [window dragImage:[self dragImage]
+                 at:position
+             offset:NSZeroSize
+              event:dragEvent
+         pasteboard:pasteboard_
+             source:self
+          slideBack:YES];
+}
+
+- (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint
+  operation:(NSDragOperation)operation {
+}
+
+- (void)endDragAt:(NSPoint)screenPoint
+        operation:(NSDragOperation)operation {
+  RenderViewHost* rvh = [contentsView_ tabContents]->render_view_host();
+  if (rvh) {
+    rvh->DragSourceSystemDragEnded();
+
+    NSPoint localPoint = [contentsView_ convertPoint:screenPoint fromView: nil];
+    FlipPointCoordinates(screenPoint, localPoint, contentsView_);
+    rvh->DragSourceEndedAt(localPoint.x, localPoint.y,
+                           screenPoint.x, screenPoint.y,
+                           static_cast<WebKit::WebDragOperation>(operation));
+  }
+
+  // Make sure the pasteboard owner isn't us.
+  [pasteboard_ declareTypes:[NSArray array] owner:nil];
+}
+
+- (void)moveDragTo:(NSPoint)screenPoint {
+  RenderViewHost* rvh = [contentsView_ tabContents]->render_view_host();
+  if (rvh) {
+    NSPoint localPoint = [contentsView_ convertPoint:screenPoint fromView:nil];
+    FlipPointCoordinates(screenPoint, localPoint, contentsView_);
+    rvh->DragSourceMovedTo(localPoint.x, localPoint.y,
+                           screenPoint.x, screenPoint.y);
+  }
+}
+
+@end  // @implementation WebContentsDragSource
+