Instant: Rename 'preview' to 'overlay'

chrome/browser/instant/instant_overlay_model.h

Index: chrome/browser/instant/instant_overlay_model.h
diff --git a/chrome/browser/instant/instant_overlay_model.h b/chrome/browser/instant/instant_overlay_model.h
new file mode 100644
index 0000000000000000000000000000000000000000..d8203be35cd22e594d6089ca80d77d13e8d2cca6
--- /dev/null
+++ b/chrome/browser/instant/instant_overlay_model.h
@@ -0,0 +1,64 @@
+// Copyright 2012 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_INSTANT_INSTANT_OVERLAY_MODEL_H_
+#define CHROME_BROWSER_INSTANT_INSTANT_OVERLAY_MODEL_H_
+
+#include "base/basictypes.h"
+#include "base/observer_list.h"
+#include "chrome/common/instant_types.h"
+#include "chrome/common/search_types.h"
+
+class InstantController;
+class InstantOverlayModelObserver;
+
+namespace content {
+class WebContents;
+}
+
+// Holds state that is important to any views concerned with visibility and
+// layout of the Instant overlay.
+class InstantOverlayModel {
+ public:
+  explicit InstantOverlayModel(InstantController* controller);
+  ~InstantOverlayModel();
+
+  // InstantOverlayModel only uses Mode::mode internally. Other parts of Mode,
+  // such as Mode::origin, may have arbitrary values, and should be ignored.
+  const chrome::search::Mode& mode() const { return mode_; }
+  int height() const { return height_; }
+  InstantSizeUnits height_units() const { return height_units_; }
+
+  void SetOverlayState(const chrome::search::Mode& mode,
+                       int height,
+                       InstantSizeUnits height_units);
+
+  void SetOverlayContents(content::WebContents* overlay_contents);
+  content::WebContents* GetOverlayContents() const;
+
+  // Add and remove observers.
+  void AddObserver(InstantOverlayModelObserver* observer);
+  void RemoveObserver(InstantOverlayModelObserver* observer);
+
+ private:
+  chrome::search::Mode mode_;
+  int height_;
+  InstantSizeUnits height_units_;
+
+  // Weak. Remembers the last set overlay contents to detect changes. Actual
+  // overlay contents is fetched from the |controller_| as this may not always
+  // reflect the actual overlay in effect.
+  content::WebContents* overlay_contents_;
+
+  // Weak. The controller currently holds some model state.
+  // TODO(dhollowa): Remove this, transfer all state to InstantOverlayModel.
+  InstantController* const controller_;
+
+  // Observers.
+  ObserverList<InstantOverlayModelObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(InstantOverlayModel);
+};
+
+#endif  // CHROME_BROWSER_INSTANT_INSTANT_OVERLAY_MODEL_H_