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Diffstat (limited to 'chrome/browser/window_clipping_info.h')
| -rw-r--r-- | chrome/browser/window_clipping_info.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/chrome/browser/window_clipping_info.h b/chrome/browser/window_clipping_info.h new file mode 100644 index 0000000..20e450f --- /dev/null +++ b/chrome/browser/window_clipping_info.h @@ -0,0 +1,89 @@ +// Copyright 2008, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#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__ |