Initial implementation of status tray functionality (mac-only, currently).

chrome/browser/cocoa/status_icons/status_icon_mac.mm

+// Copyright (c) 2010 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/cocoa/status_icons/status_icon_mac.h"
+
+#include "base/logging.h"
+#include "base/sys_string_conversions.h"
+#include "skia/ext/skia_utils_mac.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+@interface StatusItemController : NSObject {
+  StatusIconMac* statusIcon_; // weak
+}
+- initWithIcon:(StatusIconMac*)icon;
+- (void)handleClick:(id)sender;
+
+@end // @interface StatusItemController
+
+@implementation StatusItemController
+
+- (id)initWithIcon:(StatusIconMac*)icon {
+  statusIcon_ = icon;
+  return self;
+}
+
+- (void)handleClick:(id)sender {
+  // Pass along the click notification to our owner.
+  DCHECK(statusIcon_);
+  statusIcon_->HandleClick();
+}
+
+@end
+
+StatusIconMac::StatusIconMac()
+    : item_(NULL) {
+  controller_.reset([[StatusItemController alloc] initWithIcon:this]);
+}
+
+StatusIconMac::~StatusIconMac() {
+  // Remove the status item from the status bar.
+  if (item_)
+    [[NSStatusBar systemStatusBar] removeStatusItem:item_];
+}
+
+NSStatusItem* StatusIconMac::item() {
+  if (!item_.get()) {
+    // Create a new status item.
+    item_.reset([[[NSStatusBar systemStatusBar]
+                  statusItemWithLength:NSSquareStatusItemLength] retain]);
+    [item_ setEnabled:YES];
+    [item_ setTarget:controller_];
+    [item_ setAction:@selector(handleClick:)];
+  }
+  return item_.get();
+}
+
+void StatusIconMac::SetImage(const SkBitmap& bitmap) {
+  if (!bitmap.isNull()) {
+    NSImage* image = gfx::SkBitmapToNSImage(bitmap);
+    if (image)
+      [item() setImage:image];
+  }
+}
+
+void StatusIconMac::SetToolTip(const string16& tool_tip) {
+  [item() setToolTip:base::SysUTF16ToNSString(tool_tip)];
+}
+
+void StatusIconMac::AddObserver(StatusIconObserver* observer) {
+  observers_.push_back(observer);
+}
+
+void StatusIconMac::RemoveObserver(StatusIconObserver* observer) {
+  std::vector<StatusIconObserver*>::iterator iter =
+      std::find(observers_.begin(), observers_.end(), observer);
+  if (iter != observers_.end())
+    observers_.erase(iter);
+}
+
+void StatusIconMac::HandleClick() {
+  // Walk observers, call callback for each one.
+  for (std::vector<StatusIconObserver*>::const_iterator iter =
+           observers_.begin();
+       iter != observers_.end();
+       ++iter) {
+    StatusIconObserver* observer = *iter;
+    observer->OnClicked();
+  }
+}
+
+// static factory method
+StatusIcon* StatusIcon::Create() {
+  return new StatusIconMac();
+}