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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_WINDOW_CLIPPING_INFO_H__
#define CHROME_BROWSER_WINDOW_CLIPPING_INFO_H__
#include <windows.h>
#include <atlbase.h>
#include <atlapp.h>
#include <atlmisc.h>
#include "base/basictypes.h"
////////////////////////////////////////////////////////////////////////////////
//
// WindowClippingInfo class
//
// A facility to compute the invisible areas of a window. Given a window,
// this helper class computes all the areas which are obscured or clipped
// by the screen bounds and return them within a single HRGN.
//
////////////////////////////////////////////////////////////////////////////////
class WindowClippingInfo {
public:
//
// Create a new WindowClippingInfo instance to compute clipping info for HWND
// If ignore_wnd is provided, obstruction from that window will be ignored
//
WindowClippingInfo(HWND aWindow, HWND ignore_wnd);
~WindowClippingInfo();
//
// Return a single region containing all the clipped areas
// of the HWND. The region is in HWND coordinate system
//
HRGN GetClippedRegion() const;
//
// Convenience to test whether the window is clipped
//
BOOL IsClipped() const;
private:
// Combine 2 regions
HRGN CombineRegions(HRGN existing, HRGN additional) const;
// Compute the clipping caused by the screen boundaries
void ComputeScreenClipping();
static BOOL CALLBACK WindowEnumProc(HWND hwnd, LPARAM lParam);
// Compute the clipping caused by higher level windows
void ComputeWindowsClipping();
HWND hwnd_;
HWND ignore_;
HRGN rgn_;
CRect hwnd_rect_;
DISALLOW_EVIL_CONSTRUCTORS(WindowClippingInfo);
};
#endif // CHROME_BROWSER_WINDOW_CLIPPING_INFO_H__
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