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mojo/services/view_manager/access_policy.h

+// Copyright 2014 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 SERVICES_VIEW_MANAGER_ACCESS_POLICY_H_
+#define SERVICES_VIEW_MANAGER_ACCESS_POLICY_H_
+
+#include "mojo/services/view_manager/ids.h"
+#include "third_party/mojo_services/src/view_manager/public/interfaces/view_manager_constants.mojom.h"
+
+namespace view_manager {
+
+class ServerView;
+
+// AccessPolicy is used by ViewManagerServiceImpl to determine what a connection
+// is allowed to do.
+class AccessPolicy {
+ public:
+  virtual ~AccessPolicy() {}
+
+  // Unless otherwise mentioned all arguments have been validated. That is the
+  // |view| arguments are non-null unless otherwise stated (eg CanSetView() is
+  // allowed to take a NULL view).
+  virtual bool CanRemoveViewFromParent(const ServerView* view) const = 0;
+  virtual bool CanAddView(const ServerView* parent,
+                          const ServerView* child) const = 0;
+  virtual bool CanReorderView(const ServerView* view,
+                              const ServerView* relative_view,
+                              mojo::OrderDirection direction) const = 0;
+  virtual bool CanDeleteView(const ServerView* view) const = 0;
+  virtual bool CanGetViewTree(const ServerView* view) const = 0;
+  // Used when building a view tree (GetViewTree()) to decide if we should
+  // descend into |view|.
+  virtual bool CanDescendIntoViewForViewTree(const ServerView* view) const = 0;
+  virtual bool CanEmbed(const ServerView* view) const = 0;
+  virtual bool CanChangeViewVisibility(const ServerView* view) const = 0;
+  virtual bool CanSetViewSurfaceId(const ServerView* view) const = 0;
+  virtual bool CanSetViewBounds(const ServerView* view) const = 0;
+  virtual bool CanSetViewProperties(const ServerView* view) const = 0;
+
+  // Returns whether the connection should notify on a hierarchy change.
+  // |new_parent| and |old_parent| are initially set to the new and old parents
+  // but may be altered so that the client only sees a certain set of views.
+  virtual bool ShouldNotifyOnHierarchyChange(
+      const ServerView* view,
+      const ServerView** new_parent,
+      const ServerView** old_parent) const = 0;
+};
+
+}  // namespace view_manager
+
+#endif  // SERVICES_VIEW_MANAGER_ACCESS_POLICY_H_