extensions: Refactor ExtensionInstallUI class.

chrome/browser/extensions/extension_uninstall_dialog.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_UNINSTALL_DIALOG_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_UNINSTALL_DIALOG_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/extensions/image_loading_tracker.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+class MessageLoop;
+class Profile;
+
+class ExtensionUninstallDialog : public ImageLoadingTracker::Observer {
+ public:
+  class Delegate {
+   public:
+    // We call this method to signal that the uninstallation should continue.
+    virtual void ExtensionDialogAccepted() = 0;
+
+    // We call this method to signal that the uninstallation should stop.
+    virtual void ExtensionDialogCanceled() = 0;
+
+   protected:
+    virtual ~Delegate() {}
+  };
+
+  explicit ExtensionUninstallDialog(Profile* profile);
+  virtual ~ExtensionUninstallDialog();
+
+  // This is called by the extensions management page to verify whether the
+  // uninstallation should proceed.
+  // Starts the process of showing a confirmation UI, which is split into two.
+  // 1) Set off a 'load icon' task.
+  // 2) Handle the load icon response and show the UI (OnImageLoaded).
+  void ConfirmUninstall(Delegate* delegate, const Extension* extension);
+
+ private:
+  // Creates an appropriate ExtensionUninstallDialog for the platform.
+  static void Show(Profile* profile,
+                   Delegate* delegate,
+                   const Extension* extension,
+                   SkBitmap* icon);
+
+  // Sets the icon that will be used in any UI. If |icon| is NULL, or contains
+  // an empty bitmap, then a default icon will be used instead.
+  void SetIcon(SkBitmap* icon);
+
+  // ImageLoadingTracker::Observer:
+  virtual void OnImageLoaded(SkBitmap* image,
+                             const ExtensionResource& resource,
+                             int index) OVERRIDE;
+
+  Profile* profile_;
+  MessageLoop* ui_loop_;
+
+  // The delegate we will call Accepted/Canceled on after confirmation UI.
+  Delegate* delegate_;
+
+  // The extension we are showing the UI for.
+  const Extension* extension_;
+
+  // Keeps track of extension images being loaded on the File thread for the
+  // purpose of showing the install UI.
+  ImageLoadingTracker tracker_;
+
+  // The extensions icon.
+  SkBitmap icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionUninstallDialog);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_UNINSTALL_DIALOG_H_