Support auto-hide taskbar for panels on Windows.

chrome/browser/ui/panels/bottom_bar_win.cc

+// Copyright (c) 2011 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/panels/bottom_bar.h"
+
+#include <windows.h>
+#include <shellapi.h>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/ui/window_sizer.h"
+#include "views/widget/monitor_win.h"
+
+namespace {
+
+// The thickness of an auto-hide taskbar in pixels.

[Dmitry Titov, 2011/08/17 22:56:38]

What is exactly a thickness here? Needs better explanation.

[jianli, 2011/08/22 20:44:42]

Done.

+const int kAutoHideTaskbarThicknessPx = 2;
+
+gfx::Rect GetBottomBarBounds() {
+  HWND taskbar = ::FindWindow(L"Shell_TrayWnd", NULL);
+  if (!taskbar)
+    return gfx::Rect();
+  RECT rect;
+  if (!::GetWindowRect(taskbar, &rect))
+    return gfx::Rect();
+  return gfx::Rect(rect);
+}
+
+}
+
+bool IsBottomBarInAutoHideMode() {
+  RECT rect;
+  HMONITOR monitor = ::MonitorFromRect(&rect, MONITOR_DEFAULTTOPRIMARY);
+  DCHECK(monitor);
+  return views::EdgeHasTopmostAutoHideTaskbar(ABE_BOTTOM, monitor);
+}
+
+int GetBottomBarHeight() {
+  gfx::Rect bounds = GetBottomBarBounds();
+  return bounds.height();
+}
+
+bool IsBottomBarFullyVisible() {
+  scoped_ptr<WindowSizer::MonitorInfoProvider> info_provider(
+      WindowSizer::CreateDefaultMonitorInfoProvider());
+  gfx::Rect screen_bounds = info_provider->GetPrimaryMonitorBounds();
+
+  gfx::Rect bottom_bar_bounds = GetBottomBarBounds();
+  return bottom_bar_bounds.bottom() <= screen_bounds.bottom();
+}
+
+bool IsBottomBarHidden() {
+  scoped_ptr<WindowSizer::MonitorInfoProvider> info_provider(
+      WindowSizer::CreateDefaultMonitorInfoProvider());
+  gfx::Rect screen_bounds = info_provider->GetPrimaryMonitorBounds();
+
+  gfx::Rect bottom_bar_bounds = GetBottomBarBounds();
+  return bottom_bar_bounds.y() >=
+         screen_bounds.bottom() - kAutoHideTaskbarThicknessPx;
+}