chromeos: Refactor the code for showing the network UI.

ui/chromeos/network/network_list_delegate.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 UI_CHROMEOS_NETWORK_NETWORK_LIST_DELEGATE_H_
+#define UI_CHROMEOS_NETWORK_NETWORK_LIST_DELEGATE_H_
+
+#include "ui/chromeos/ui_chromeos_export.h"
+
+namespace chromeos {
+class NetworkState;
+}
+
+namespace views {
+class Label;
+class View;
+}
+
+namespace ui {
+
+struct NetworkInfo;
+
+class UI_CHROMEOS_EXPORT NetworkListDelegate {
+ public:
+  virtual ~NetworkListDelegate() {}
+
+  // Returns true if |network| should not be added to the list.
+  virtual bool ShouldSkipNetwork(const chromeos::NetworkState& network) = 0;
+
+  // Creates and returns a View with the information in |info|.
+  virtual views::View* CreateViewForNetwork(const NetworkInfo& info) = 0;
+
+  // Returns true if |view| is currently under the cursor. Note that |view| is
+  // guaranteed to be a View returned from |CreateViewForNetwork()|.
+  virtual bool IsViewHovered(views::View* view) = 0;
+
+  // Returns whether only VPN networks should be listed.
+  virtual bool ShouldListOnlyVPN() const = 0;
+
+  // Updates |view| with the information in |info|. Note that |view| is
+  // guaranteed to be a View returned from |CreateViewForNetwork()|.
+  virtual void UpdateViewForNetwork(views::View* view,
+                                    const NetworkInfo& info) = 0;
+
+  // Returns whether any View was updated that needs a relayout of the list.
+  virtual bool OnNetworkListIsEmpty() = 0;

[stevenjb, 2014/07/24 19:13:54]

The purpose of this is unclear and appears to be unused?

[sadrul, 2014/07/24 20:38:45]

Good catch. Removed.

+
+  // Creates a Label to be displayed in the list to present some information
+  // (e.g. unavailability of network etc.).
+  virtual views::Label* CreateInfoLabel() = 0;
+
+  virtual void RelayoutScrollList() = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_CHROMEOS_NETWORK_NETWORK_LIST_DELEGATE_H_