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// Copyright (c) 2006-2008 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_ICON_LOADER_H_
#define CHROME_BROWSER_ICON_LOADER_H_
#include <string>
#include "base/basictypes.h"
#include "base/file_path.h"
namespace {
class IconLoaderProcessor;
}
class SkBitmap;
////////////////////////////////////////////////////////////////////////////////
//
// A facility to read a file containing an icon asynchronously in the IO
// thread. Clients has the option to get the icon in the form of two HICON
// handles (one for a small icon size and one for a large icon) or in the form
// of an SkBitmap.
//
// This class currently only supports reading .ico files. Please extend as
// needed.
//
////////////////////////////////////////////////////////////////////////////////
class IconLoader {
public:
enum IconSize {
SMALL = 0, // 16x16
NORMAL, // 32x32
LARGE
};
class Delegate {
public:
// Invoked when an icon has been read. |source| is the IconLoader. If the
// icon has been successfully loaded, result is non-null. This method must
// return true if it is taking ownership of the returned bitmap.
virtual bool OnSkBitmapLoaded(IconLoader* source, SkBitmap* result) = 0;
};
// Create a new IconLoader that loads the icon from the data at contained in
// the file at |path|.
static IconLoader* CreateIconLoaderForFile(const FilePath& path,
Delegate* delegate);
// Create a new IconLoader that loads the icon in the resource of the file
// at |path|. This is used with .exe/.dll files.
// Note that this generates a SkBitmap (and consequently OnSkBitmapLoaded is
// invoked on the delegate once the load has completed).
static IconLoader* CreateIconLoaderForFileResource(const FilePath& path,
IconSize size,
Delegate* delegate);
~IconLoader();
// Start the read operation
void Start();
// Cancel the read operation. The delegate will no longer be contacted. Call
// this method if you need to delete the delegate.
void Cancel();
private:
friend class IconLoaderProcessor;
// Use the factory methods CreateIconLoader* instead of using this constructor
IconLoader(const FilePath& path,
bool from_resource,
IconSize size,
Delegate* delegate);
// Invoked by the processor when the file has been read and an SkBitmap
// object was requested.
bool OnLoadComplete(SkBitmap* result);
// The path.
FilePath path_;
// The delegate.
Delegate* delegate_;
// Whether we are loading the icon from the resource in the file (if false,
// the icon is simply loaded from the file content).
bool loading_from_resource_;
// The size of the icon that should be loaded from the file resource.
// Not used if loading_from_resource_ is false.
IconSize icon_size_;
// The underlying object performing the read.
IconLoaderProcessor* processor_;
DISALLOW_COPY_AND_ASSIGN(IconLoader);
};
#endif // CHROME_BROWSER_ICON_LOADER_H_
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