Revert "views: Move widget/ directory to ui/views." properly.

views/widget/drop_target_gtk.h

+// Copyright (c) 2011 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 VIEWS_WIDGET_DROP_TARGET_GTK_H_
+#define VIEWS_WIDGET_DROP_TARGET_GTK_H_
+#pragma once
+
+#include <gtk/gtk.h>
+#include <set>
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/base/dragdrop/os_exchange_data.h"
+#include "views/widget/drop_helper.h"
+
+namespace ui {
+class OSExchangeDataProviderGtk;
+}
+using ui::OSExchangeData;
+using ui::OSExchangeDataProviderGtk;
+
+namespace views {
+
+class View;
+namespace internal {
+class RootView;
+}
+
+// DropTarget implementation for Gtk.
+//
+// The data for a drop is not immediately available on X. As such we lazily
+// ask for data as necessary. Some Views require data before they can determine
+// if the drop is going to be allowed. When such a View is encountered the
+// relevant data is requested from the drag source. When the data is available
+// the target is notified. Similarly if the drop completes and the data has
+// not yet been fetched, it is fetched and the target then notified.
+//
+// When a drop finishes this class calls back to the containing NativeWidgetGtk
+// which results in deleting the DropTargetGtk.
+class DropTargetGtk {
+ public:
+  DropTargetGtk(internal::RootView* root_view, GdkDragContext* context);
+  ~DropTargetGtk();
+
+  // If a drag and drop is underway and |view| is the current drop target, the
+  // drop target is set to null.
+  // This is invoked when a View is removed from the RootView to make sure
+  // we don't target a view that was removed during dnd.
+  void ResetTargetViewIfEquals(View* view);
+
+  // Drop methods from Gtk. These are forwarded from the containing
+  // NativeWidgetGtk.
+  void OnDragDataReceived(GdkDragContext* context,
+                          gint x,
+                          gint y,
+                          GtkSelectionData* data,
+                          guint info,
+                          guint time);
+  gboolean OnDragDrop(GdkDragContext* context,
+                      gint x,
+                      gint y,
+                      guint time);
+  void OnDragLeave(GdkDragContext* context, guint time);
+  gboolean OnDragMotion(GdkDragContext* context,
+                        gint x,
+                        gint y,
+                        guint time);
+
+ private:
+  // Invoked when the drop finishes AND all the data is available.
+  void FinishDrop(GdkDragContext* context, gint x, gint y, guint time);
+
+  // Returns in |f2| and |cf2| the intersection of |f1| |f2| and
+  // |cf1|, |cf2|.
+  void IntersectFormats(int f1, const std::set<GdkAtom>& cf1,
+                        int* f2, std::set<GdkAtom>* cf2);
+
+  // Requests the formats in |formats| and the custom formats in
+  // |custom_formats|.
+  void RequestFormats(GdkDragContext* context,
+                      int formats,
+                      const std::set<GdkAtom>& custom_formats,
+                      guint time);
+
+  // Reutrns the Provider of the OSExchangeData we created.
+  OSExchangeDataProviderGtk& data_provider() const;
+
+  // Manages sending the appropriate drop methods to the view the drop is over.
+  DropHelper helper_;
+
+  // The formats we've requested from the drag source.
+  //
+  // NOTE: these formats are the intersection of the formats requested by the
+  // drop target and the formats provided by the source.
+  int requested_formats_;
+  std::set<GdkAtom> requested_custom_formats_;
+
+  // The data.
+  scoped_ptr<OSExchangeData> data_;
+
+  // Are we waiting for data from the source before we can notify the view?
+  // This is set in two distinct ways: when the view requires the data before
+  // it can answer Can Drop (that is, AreDropTypesRequired returns true) and
+  // when the user dropped the data but we didn't get it all yet.
+  bool waiting_for_data_;
+
+  // Has OnDragDrop been invoked?
+  bool received_drop_;
+
+  // The view under the mouse. This is not necessarily the same as
+  // helper_.target_view(). The two differ if the view under the mouse requires
+  // the data.
+  View* pending_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(DropTargetGtk);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_WIDGET_DROP_TARGET_GTK_H_