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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_VIEW_PROP_H_
#define UI_BASE_VIEW_PROP_H_
#include "base/component_export.h"
#include "base/memory/scoped_refptr.h"
#include "build/build_config.h"
#include "ui/gfx/native_widget_types.h"
#if !BUILDFLAG(IS_WIN) && !defined(USE_AURA)
#error view_prop.h is only for windows and aura builds.
#endif
namespace ui {
// ViewProp maintains a key/value pair for a particular view. ViewProp is
// designed as a replacement for the Win32's SetProp, but does not make use of
// window manager memory. ViewProp shares similar semantics as SetProp, the
// value for a particular view/key pair comes from the last ViewProp created.
class COMPONENT_EXPORT(UI_BASE) ViewProp {
public:
// Associates data with a view/key pair. If a ViewProp has already been
// created for the specified pair |data| replaces the current value.
//
// ViewProp does *not* make a copy of the char*, the pointer is used for
// sorting.
ViewProp(gfx::AcceleratedWidget view, const char* key, void* data);
ViewProp(const ViewProp&) = delete;
ViewProp& operator=(const ViewProp&) = delete;
~ViewProp();
// Returns the value associated with the view/key pair, or NULL if there is
// none.
static void* GetValue(gfx::AcceleratedWidget view, const char* key);
// Returns the key.
const char* Key() const;
private:
class Data;
// Stores the actual data.
scoped_refptr<Data> data_;
};
} // namespace ui
#endif // UI_BASE_VIEW_PROP_H_
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