Implement message center on Windows

chrome/browser/ui/views/message_center/message_center_tray_host_win.cc

+// 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/message_center/message_center_tray_host_win.h"
+
+#include "base/memory/singleton.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/status_icons/status_icon.h"
+#include "chrome/browser/status_icons/status_tray.h"
+#include "chrome/browser/ui/message_center/message_center_util.h"
+#include "grit/theme_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/base/win/hwnd_util.h"
+#include "ui/gfx/image/image_skia_operations.h"
+#include "ui/gfx/screen.h"
+#include "ui/message_center/message_center_tray.h"
+
+namespace {
+
+// Tray constants
+const int kPaddingFromLeftEdgeOfSystemTrayBottomAlignment = 8;
+
+gfx::Rect GetCornerAnchorRect() {
+  gfx::Screen* screen = gfx::Screen::GetNativeScreen();
+  gfx::Point cursor = screen->GetCursorScreenPoint();
+  gfx::Rect rect = screen->GetPrimaryDisplay().work_area();
+  rect.Inset(kPaddingFromLeftEdgeOfSystemTrayBottomAlignment, 0);
+  return gfx::Rect(rect.bottom_right(), gfx::Size());
+}
+
+// GetMouseAnchorRect returns a rectangle that is near the cursor point, but
+// whose behavior depends on where the Windows taskbar is.  If it is on the
+// top or bottom of the screen, we want the arrow to touch the edge of the
+// taskbar directly above or below the mouse pointer and within the work area.
+// Otherwise, position the anchor on the mouse cursor directly.
+gfx::Rect GetMouseAnchorRect() {
+  gfx::Screen* screen = gfx::Screen::GetNativeScreen();
+  gfx::Point cursor = screen->GetCursorScreenPoint();
+  gfx::Rect rect = screen->GetPrimaryDisplay().bounds();
+  gfx::Rect work_area = screen->GetPrimaryDisplay().work_area();
+
+  // Inset the rectangle by the taskbar width if it is on top or bottom.
+  rect.set_y(work_area.y());
+  rect.set_height(work_area.height());
+
+  rect.Inset(kPaddingFromLeftEdgeOfSystemTrayBottomAlignment, 0);
+
+  // Want to find a mouse point that is on the mouse cursor, unless the mouse is
+  // over the start menu and the start menu is on the top or bottom.
+  gfx::Rect mouse_anchor_rect(gfx::BoundingRect(cursor, rect.bottom_right()));
+  mouse_anchor_rect.set_height(0);
+  if (!rect.Contains(cursor))
+    mouse_anchor_rect.AdjustToFit(rect);
+  mouse_anchor_rect.set_width(0);
+  return mouse_anchor_rect;
+}
+
+}  // namespace
+
+#if defined(ENABLE_MESSAGE_CENTER)
+
+namespace chrome {
+
+// static
+ui::MessageCenterTrayHost* GetMessageCenterTray() {
+  return ui::MessageCenterTrayHostWin::GetInstance();
+}
+
+}  // namespace chrome
+
+#endif
+
+
+namespace ui {
+
+// TODO(dewittj): Un-singleton.
+MessageCenterTrayHostWin* MessageCenterTrayHostWin::GetInstance() {
+  return Singleton<MessageCenterTrayHostWin>::get();
+}
+
+MessageCenterTrayHostWin::MessageCenterTrayHostWin()
+    : status_icon_(NULL),
+      message_center_visible_(false) {
+  message_center_tray_ = new MessageCenterTray(this);
+}
+
+MessageCenterTrayHostWin::~MessageCenterTrayHostWin() {
+  if (status_icon_ != NULL) {
+    status_icon_->RemoveObserver(this);
+    StatusTray * status_tray = g_browser_process->status_tray();
+    status_tray->RemoveStatusIcon(status_icon_);
+    status_icon_ = NULL;
+  }
+}
+
+message_center::MessageCenter* MessageCenterTrayHostWin::message_center() {
+  return message_center_tray_->message_center();
+}
+
+void MessageCenterTrayHostWin::OnMessageCenterTrayChanged() {
+  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+  bool has_notifications = message_center()->NotificationCount() > 0;
+  StatusTray* status_tray = g_browser_process->status_tray();
+  if (has_notifications) {
+    if (status_icon_ == NULL) {
+      status_icon_ = status_tray->CreateStatusIcon();
+      status_icon_->AddObserver(this);
+    }
+    // TODO(dewittj): Get some icons.
+    gfx::ImageSkia* icon =
+        rb.GetImageSkiaNamed(IDR_ALLOWED_NOTIFICATION);
+    if (message_center()->UnreadNotificationCount() > 0) {
+      status_icon_->SetImage(*icon);
+    } else {
+      status_icon_->SetImage(
+          gfx::ImageSkiaOperations::CreateTransparentImage(*icon, .5));
+    }
+  } else if (status_icon_ != NULL) {
+    status_tray->RemoveStatusIcon(status_icon_);
+    status_icon_ = NULL;
+  }
+}
+
+string16 MessageCenterTrayHostWin::GetAccessibleNameForBubble() {
+  // TODO(dewittj): Get a proper string resource.
+  return ASCIIToUTF16("Windows Notification Center");
+}
+
+void MessageCenterTrayHostWin::OnShowMessageCenterBubble() {
+  message_center_visible_ = true;
+}
+
+void MessageCenterTrayHostWin::OnHideMessageCenterBubble() {
+  message_center_visible_ = false;
+}
+
+gfx::Rect MessageCenterTrayHostWin::GetAnchorRect(
+    views::Widget* anchor_widget,
+    views::TrayBubbleView::AnchorType anchor_type,
+    views::TrayBubbleView::AnchorAlignment anchor_alignment) {
+  // |message_center_visible_| is set before the bubble is actually rendered,
+  // so the flag can be used to determine which anchor to use.
+  if (message_center_visible_)
+    return message_center_anchor_rect_;
+  return GetCornerAnchorRect();
+}
+
+bool MessageCenterTrayHostWin::CanShowPopups() {
+  // TODO(dewittj): This will eventually depend on whether quiet mode is active.
+  return true;
+}
+
+void MessageCenterTrayHostWin::OnStatusIconClicked() {
+  UpdateAnchorRect();
+  message_center_tray_->ToggleMessageCenterBubble();
+}
+
+void MessageCenterTrayHostWin::UpdateAnchorRect() {
+  message_center_anchor_rect_ = GetMouseAnchorRect();
+}
+
+views::TrayBubbleView::AnchorAlignment
+MessageCenterTrayHostWin::GetAnchorAlignment() {
+  gfx::Screen* screen = gfx::Screen::GetNativeScreen();
+  // TODO(dewittj): It's possible GetPrimaryDisplay is wrong.
+  gfx::Rect screen_bounds = screen->GetPrimaryDisplay().bounds();
+  gfx::Rect work_area = screen->GetPrimaryDisplay().work_area();
+
+  if (work_area.height() < screen_bounds.height())
+    return views::TrayBubbleView::ANCHOR_ALIGNMENT_BOTTOM;
+  if (work_area.x() > screen_bounds.x())
+    return views::TrayBubbleView::ANCHOR_ALIGNMENT_LEFT;
+  return views::TrayBubbleView::ANCHOR_ALIGNMENT_RIGHT;
+}
+
+void MessageCenterTrayHostWin::UpdateInitParams(
+    views::TrayBubbleView::InitParams* init_params) {
+  init_params->anchor_type = views::TrayBubbleView::ANCHOR_TYPE_TRAY;
+  init_params->arrow_alignment = views::BubbleBorder::ALIGN_ARROW_TO_MID_ANCHOR;
+  // TODO(dewittj): Show big shadow without blocking clicks.
+  init_params->shadow = views::BubbleBorder::NO_SHADOW;
+}
+
+gfx::NativeView MessageCenterTrayHostWin::GetBubbleWindowContainer() {
+  return NULL;
+}
+
+}  // namespace ui