chromium/ui/base/hit_test.h

// 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_HIT_TEST_H_
#define UI_BASE_HIT_TEST_H_

#include "build/build_config.h"

#if BUILDFLAG(IS_WIN)

// Define the HT* values so that this header can be included whether or not
// windows.h has been included. The definitions must exactly match to avoid
// redefinition errors when compiling source files which also include windows.h.
// Those source files conveniently provide a check that these values match.
// windows.h is not included here because of the namespace pollution it causes.
#define HTERROR …
#define HTTRANSPARENT …
#define HTNOWHERE …
#define HTCLIENT …
#define HTCAPTION …
#define HTSYSMENU …
#define HTGROWBOX …
#define HTSIZE …
#define HTMENU …
#define HTHSCROLL …
#define HTVSCROLL …
#define HTMINBUTTON …
#define HTMAXBUTTON …
#define HTLEFT …
#define HTRIGHT …
#define HTTOP …
#define HTTOPLEFT …
#define HTTOPRIGHT …
#define HTBOTTOM …
#define HTBOTTOMLEFT …
#define HTBOTTOMRIGHT …
#define HTBORDER …
#define HTREDUCE …
#define HTZOOM …
#define HTSIZEFIRST …
#define HTSIZELAST …
#define HTOBJECT …
#define HTCLOSE …
#define HTHELP …

#else

// Defines the same symbolic names used by the WM_NCHITTEST Notification under
// win32 (the integer values are not guaranteed to be equivalent). We do this
// because we have a whole bunch of code that deals with window resizing and
// such that requires these values.
enum HitTestCompat { … };

#endif  // BUILDFLAG(IS_WIN)

namespace ui {

// Returns true if the |component| is for resizing, like HTTOP or HTBOTTOM.
bool IsResizingComponent(int component);

// Returns true if the |component| is HTCAPTION or one of the resizing
// components.
bool CanPerformDragOrResize(int component);

}  // namespace ui

#endif  // UI_BASE_HIT_TEST_H_