Pulls WebDragDest out of TabContentsViewGtk so that it can be used by

both views and gtk.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/265041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28457 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 105 insertions, 0 deletions

diff --git a/chrome/browser/tab_contents/web_drag_dest_gtk.h b/chrome/browser/tab_contents/web_drag_dest_gtk.h
new file mode 100644
index 0000000..8bba71e
--- /dev/null
+++ b/chrome/browser/tab_contents/web_drag_dest_gtk.h
@@ -0,0 +1,105 @@
+// Copyright (c) 2009 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.
+
+#ifndef CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
+#define CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
+
+#include <gtk/gtk.h>
+
+#include "base/scoped_ptr.h"
+#include "base/task.h"
+#include "webkit/api/public/WebDragOperation.h"
+#include "webkit/glue/webdropdata.h"
+
+class TabContents;
+
+// A helper class that handles DnD for drops in the renderer. In GTK parlance,
+// this handles destination-side DnD, but not source-side DnD.
+class WebDragDestGtk {
+ public:
+  WebDragDestGtk(TabContents* tab_contents, GtkWidget* widget);
+  ~WebDragDestGtk();
+
+  // This is called when the renderer responds to a drag motion event. We must
+  // update the system drag cursor.
+  void UpdateDragStatus(WebKit::WebDragOperation operation);
+
+  // Informs the renderer when a system drag has left the render view.
+  // See OnDragLeave().
+  void DragLeave();
+
+ private:
+  static gboolean OnDragMotionThunk(
+      GtkWidget* widget, GdkDragContext* drag_context, gint x, gint y,
+      guint time, WebDragDestGtk* dest) {
+    return dest->OnDragMotion(drag_context, x, y, time);
+  }
+  static void OnDragLeaveThunk(
+      GtkWidget* widget, GdkDragContext* drag_context, guint time,
+      WebDragDestGtk* dest) {
+    dest->OnDragLeave(drag_context, time);
+  }
+  static gboolean OnDragDropThunk(
+      GtkWidget* widget, GdkDragContext* drag_context, gint x, gint y,
+      guint time, WebDragDestGtk* dest) {
+    return dest->OnDragDrop(drag_context, x, y, time);
+  }
+  static void OnDragDataReceivedThunk(
+      GtkWidget* widget, GdkDragContext* drag_context, gint x, gint y,
+      GtkSelectionData* data, guint info, guint time, WebDragDestGtk* dest) {
+    dest->OnDragDataReceived(drag_context, x, y, data, info, time);
+  }
+
+  // Called when a system drag crosses over the render view. As there is no drag
+  // enter event, we treat it as an enter event (and not a regular motion event)
+  // when |context_| is NULL.
+  gboolean OnDragMotion(GdkDragContext* context, gint x, gint y, guint time);
+
+  // We make a series of requests for the drag data when the drag first enters
+  // the render view. This is the callback that is used to give us the data
+  // for each individual target. When |data_requests_| reaches 0, we know we
+  // have attained all the data, and we can finally tell the renderer about the
+  // drag.
+  void OnDragDataReceived(GdkDragContext* context, gint x, gint y,
+                          GtkSelectionData* data, guint info, guint time);
+
+  // The drag has left our widget; forward this information to the renderer.
+  void OnDragLeave(GdkDragContext* context, guint time);
+
+  // Called by GTK when the user releases the mouse, executing a drop.
+  gboolean OnDragDrop(GdkDragContext* context, gint x, gint y, guint time);
+
+
+  TabContents* tab_contents_;
+  // The render view.
+  GtkWidget* widget_;
+  // The current drag context for system drags over our render view, or NULL if
+  // there is no system drag or the system drag is not over our render view.
+  GdkDragContext* context_;
+  // The data for the current drag, or NULL if |context_| is NULL.
+  scoped_ptr<WebDropData> drop_data_;
+
+  // The number of outstanding drag data requests we have sent to the drag
+  // source.
+  int data_requests_;
+
+  // The last time we sent a message to the renderer related to a drag motion.
+  gint drag_over_time_;
+
+  // Whether the cursor is over a drop target, according to the last message we
+  // got from the renderer.
+  bool is_drop_target_;
+
+  // Handler ID for the destroy signal handler. We connect to the destroy
+  // signal handler so that we won't call dest_unset on it after it is
+  // destroyed, but we have to cancel the handler if we are destroyed before
+  // |widget_| is.
+  int destroy_handler_;
+
+  ScopedRunnableMethodFactory<WebDragDestGtk> method_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
+};
+
+#endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_