[Mac] Polish the search engine manager

chrome/browser/cocoa/nswindow_local_state.mm

+// Copyright (c) 2009 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.
+
+#import <Cocoa/Cocoa.h>
+#include "chrome/common/pref_service.h"
+
+@implementation NSWindow (LocalStateAdditions)
+
+- (void)saveWindowPositionToPrefs:(PrefService*)prefs 
+                         withPath:(const wchar_t*)path {
+  DCHECK(prefs);
+  // Save the origin of the window.
+  DictionaryValue* windowPrefs = prefs->GetMutableDictionary(path);
+  NSRect frame = [self frame];
+  windowPrefs->SetInteger(L"x", frame.origin.x);
+  windowPrefs->SetInteger(L"y", frame.origin.y);
+}
+
+- (void)restoreWindowPositionFromPrefs:(PrefService*)prefs
+                              withPath:(const wchar_t*)path {
+  DCHECK(prefs);
+  // Get the positioning information.
+  DictionaryValue* windowPrefs = prefs->GetMutableDictionary(path);
+  int x = 0, y = 0;
+  windowPrefs->GetInteger(L"x", &x);
+  windowPrefs->GetInteger(L"y", &y);
+  // Turn the origin (lower-left) into an upper-left window point.
+  NSPoint upperLeft = NSMakePoint(x, y + [self frame].size.height);
+  NSPoint cascadePoint = [self cascadeTopLeftFromPoint:upperLeft];
+  // Cascade again to get the offset when opening new windows.
+  [self cascadeTopLeftFromPoint:cascadePoint];
+  // Force a save of the pref.
+  [self saveWindowPositionToPrefs:prefs withPath:path];
+}
+
+@end