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// Copyright (c) 2012 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.
#include "chrome/browser/ui/views/frame/minimize_button_metrics_win.h"
#include "base/logging.h"
#include "base/i18n/rtl.h"
#include "ui/gfx/win/dpi.h"
namespace {
int GetMinimizeButtonOffsetForWindow(HWND hwnd) {
// The WM_GETTITLEBARINFOEX message can fail if we are not active/visible.
TITLEBARINFOEX titlebar_info = {0};
titlebar_info.cbSize = sizeof(TITLEBARINFOEX);
SendMessage(hwnd, WM_GETTITLEBARINFOEX, 0,
reinterpret_cast<WPARAM>(&titlebar_info));
// NOTE: TITLEBARINFOEX coordinates are not scaled (they are physical). As
// Chrome is not DPIAware we need to properly scale the coordinates as
// MapWindowPoints() expects scaled coordinates.
POINT minimize_button_corner = { titlebar_info.rgrect[2].left /
gfx::win::GetUndocumentedDPIScale(),
0 };
MapWindowPoints(HWND_DESKTOP, hwnd, &minimize_button_corner, 1);
return minimize_button_corner.x / gfx::win::GetDeviceScaleFactor();
}
} // namespace
MinimizeButtonMetrics::MinimizeButtonMetrics()
: hwnd_(NULL),
cached_minimize_button_x_delta_(0) {
}
MinimizeButtonMetrics::~MinimizeButtonMetrics() {
}
void MinimizeButtonMetrics::Init(HWND hwnd) {
DCHECK(!hwnd_);
hwnd_ = hwnd;
}
void MinimizeButtonMetrics::OnHWNDActivated() {
int minimize_offset = GetMinimizeButtonOffsetForWindow(hwnd_);
RECT rect = {0};
GetClientRect(hwnd_, &rect);
// Calculate and cache the value of the minimize button delta, i.e. the
// offset to be applied to the left or right edge of the client rect
// depending on whether the language is RTL or not.
// This cached value is only used if the WM_GETTITLEBARINFOEX message fails
// to get the offset of the minimize button.
if (base::i18n::IsRTL())
cached_minimize_button_x_delta_ = minimize_offset;
else
cached_minimize_button_x_delta_ = rect.right - minimize_offset;
}
int MinimizeButtonMetrics::GetMinimizeButtonOffsetX() const {
int minimize_button_offset = GetMinimizeButtonOffsetForWindow(hwnd_);
if (minimize_button_offset > 0)
return minimize_button_offset;
// If we fail to get the minimize button offset via the WM_GETTITLEBARINFOEX
// message then calculate and return this via the
// cached_minimize_button_x_delta_ member value. Please see
// CacheMinimizeButtonDelta() for more details.
DCHECK(cached_minimize_button_x_delta_);
RECT client_rect = {0};
GetClientRect(hwnd_, &client_rect);
if (base::i18n::IsRTL())
return cached_minimize_button_x_delta_;
return client_rect.right - cached_minimize_button_x_delta_;
}
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