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mojo/services/view_manager/view_coordinate_conversions.cc

+// 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.
+
+#include "mojo/services/view_manager/view_coordinate_conversions.h"
+
+#include "mojo/services/view_manager/server_view.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/vector2d.h"
+
+namespace view_manager {
+
+namespace {
+
+gfx::Vector2d CalculateOffsetToAncestor(const ServerView* view,
+                                        const ServerView* ancestor) {
+  DCHECK(ancestor->Contains(view));
+  gfx::Vector2d result;
+  for (const ServerView* v = view; v != ancestor; v = v->parent())
+    result += v->bounds().OffsetFromOrigin();
+  return result;
+}
+
+}  // namespace
+
+gfx::Rect ConvertRectBetweenViews(const ServerView* from,
+                                  const ServerView* to,
+                                  const gfx::Rect& rect) {
+  DCHECK(from);
+  if (from == to)
+    return rect;
+
+  if (from->Contains(to)) {
+    const gfx::Vector2d offset(CalculateOffsetToAncestor(to, from));
+    return gfx::Rect(rect.origin() - offset, rect.size());
+  }
+  DCHECK(to->Contains(from));
+  const gfx::Vector2d offset(CalculateOffsetToAncestor(from, to));
+  return gfx::Rect(rect.origin() + offset, rect.size());
+}
+
+}  // namespace view_manager