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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_VIEWS_FRAME_MINIMIZE_BUTTON_METRICS_WIN_H_
#define CHROME_BROWSER_UI_VIEWS_FRAME_MINIMIZE_BUTTON_METRICS_WIN_H_
#include <windows.h>
// Class that implements obtaining the X coordinate of the native minimize
// button for the native frame on Windows.
// This is a separate class because obtaining it is somewhat tricky and this
// code is shared between BrowserDesktopWindowTreeHostWin and BrowserFrameWin.
class MinimizeButtonMetrics {
public:
MinimizeButtonMetrics();
MinimizeButtonMetrics(const MinimizeButtonMetrics&) = delete;
MinimizeButtonMetrics& operator=(const MinimizeButtonMetrics&) = delete;
~MinimizeButtonMetrics();
void Init(HWND hwnd);
// Obtain the X offset of the native minimize button. Since Windows can lie
// to us if we call this at the wrong moment, this might come from a cached
// value rather than read when called.
int GetMinimizeButtonOffsetX() const;
// Must be called when hwnd_ is activated to update the minimize button
// position cache.
void OnHWNDActivated();
// Must be called when WM_DPICHANGED message is received.
void OnDpiChanged();
private:
// Gets the value for GetMinimizeButtonOffsetX(), caching if found.
int GetAndCacheMinimizeButtonOffsetX() const;
int GetButtonBoundsPositionOffset(const RECT& button_bounds,
const RECT& window_bounds) const;
int GetMinimizeButtonOffsetForWindow() const;
HWND hwnd_ = nullptr;
// Cached offset of the minimize button. If RTL this is the location of the
// minimize button, if LTR this is the offset from the right edge of the
// client area to the minimize button.
mutable int cached_minimize_button_x_delta_ =
last_cached_minimize_button_x_delta_;
// Static cache of `cached_minimize_button_x_delta_`.
static int last_cached_minimize_button_x_delta_;
// Static cache of offset value representing the difference between
// DWMWA_CAPTION_BUTTON_BOUNDS and WM_GETTITLEBARINFOEX
static int button_bounds_position_offset_;
// Has OnHWNDActivated() been invoked?
bool was_activated_ = false;
};
#endif // CHROME_BROWSER_UI_VIEWS_FRAME_MINIMIZE_BUTTON_METRICS_WIN_H_
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