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// Copyright (c) 2010 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 VIEWS_WIDGET_CHILD_WINDOW_MESSAGE_PROCESSOR_H_
#define VIEWS_WIDGET_CHILD_WINDOW_MESSAGE_PROCESSOR_H_
#pragma once
#include <windows.h>
namespace app {
class ViewProp;
}
namespace views {
// Windows sends a handful of messages to the parent window rather than the
// window itself. For example, selection changes of a rich edit (EN_SELCHANGE)
// are sent to the parent, not the window. Typically such message are best
// dealt with by the window rather than the parent. WidgetWin allows for
// registering a ChildWindowMessageProcessor to handle such messages.
class ChildWindowMessageProcessor {
public:
// Registers |processor| for |hwnd|. The caller takes ownership of the
// returned object.
static app::ViewProp* Register(HWND hwnd,
ChildWindowMessageProcessor* processor);
// Returns the ChildWindowMessageProcessor for |hwnd|, NULL if there isn't
// one.
static ChildWindowMessageProcessor* Get(HWND hwnd);
// Invoked for any messages that are sent to the parent and originated from
// the HWND this ChildWindowMessageProcessor was registered for. Returns true
// if the message was handled with a valid result in |result|. Returns false
// if the message was not handled.
virtual bool ProcessMessage(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* result) = 0;
protected:
virtual ~ChildWindowMessageProcessor() {}
};
} // namespace views
#endif // VIEWS_WIDGET_CHILD_WINDOW_MESSAGE_PROCESSOR_H_
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