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// Copyright (c) 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_BASE_WIN_WINDOW_EVENT_TARGET_H_
#define UI_BASE_WIN_WINDOW_EVENT_TARGET_H_
#include <windows.h>
#include "base/basictypes.h"
#include "ui/base/ui_base_export.h"
namespace ui {
// This interface is implemented by classes who get input events forwarded to
// them from others. E.g. would be a win32 parent child relationship where the
// child forwards input events to the parent after doing minimal processing.
class UI_BASE_EXPORT WindowEventTarget {
public:
static const char kWin32InputEventTarget[];
// Handles mouse events like WM_MOUSEMOVE, WM_LBUTTONDOWN, etc.
// The |message| parameter identifies the message.
// The |w_param| and |l_param| values are dependent on the type of the
// message.
// The |handled| parameter is an output parameter which when set to false
// indicates that the message should be DefProc'ed.
// Returns the result of processing the message.
virtual LRESULT HandleMouseMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) = 0;
// Handles keyboard events like WM_KEYDOWN/WM_KEYUP, etc.
// The |message| parameter identifies the message.
// The |w_param| and |l_param| values are dependent on the type of the
// message.
// The |handled| parameter is an output parameter which when set to false
// indicates that the message should be DefProc'ed.
// Returns the result of processing the message.
virtual LRESULT HandleKeyboardMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) = 0;
// Handles WM_TOUCH events.
// The |message| parameter identifies the message.
// The |w_param| and |l_param| values are as per MSDN docs.
// The |handled| parameter is an output parameter which when set to false
// indicates that the message should be DefProc'ed.
// Returns the result of processing the message.
virtual LRESULT HandleTouchMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) = 0;
// Handles scroll messages like WM_VSCROLL and WM_HSCROLL.
// The |message| parameter identifies the scroll message.
// The |w_param| and |l_param| values are dependent on the type of scroll.
// The |handled| parameter is an output parameter which when set to false
// indicates that the message should be DefProc'ed.
virtual LRESULT HandleScrollMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) = 0;
// Handles the WM_NCHITTEST message
// The |message| parameter identifies the message.
// The |w_param| and |l_param| values are as per MSDN docs.
// The |handled| parameter is an output parameter which when set to false
// indicates that the message should be DefProc'ed.
// Returns the result of processing the message.
virtual LRESULT HandleNcHitTestMessage(unsigned int message,
WPARAM w_param,
LPARAM l_param,
bool* handled) = 0;
protected:
WindowEventTarget();
virtual ~WindowEventTarget();
};
} // namespace ui
#endif // UI_BASE_WIN_WINDOW_EVENT_TARGET_H_
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