Reapply and fix r73019. BalloonViewImpl has a different implemementation on

chrome/browser/notifications/balloon_collection.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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/notifications/balloon_collection_impl.h"
+#include "chrome/browser/notifications/balloon_collection.h"
 
-#include "base/logging.h"
-#include "base/stl_util-inl.h"
-#include "chrome/browser/notifications/balloon.h"
-#include "chrome/browser/notifications/balloon_host.h"
-#include "chrome/browser/notifications/notification.h"
-#include "chrome/browser/ui/window_sizer.h"
-#include "gfx/rect.h"
-#include "gfx/size.h"
-
-namespace {
-
-// Portion of the screen allotted for notifications. When notification balloons
-// extend over this, no new notifications are shown until some are closed.
-const double kPercentBalloonFillFactor = 0.7;
-
-// Allow at least this number of balloons on the screen.
-const int kMinAllowedBalloonCount = 2;
-
-// Delay from the mouse leaving the balloon collection before
-// there is a relayout, in milliseconds.
-const int kRepositionDelay = 300;
-
-}  // namespace
-
-BalloonCollectionImpl::BalloonCollectionImpl()
-#if USE_OFFSETS
-    : ALLOW_THIS_IN_INITIALIZER_LIST(reposition_factory_(this)),
-      added_as_message_loop_observer_(false)
-#endif
-{
-
-  SetPositionPreference(BalloonCollection::DEFAULT_POSITION);
+BalloonCollection::BalloonCollection()
+    : space_change_listener_(NULL) {
 }
 
-BalloonCollectionImpl::~BalloonCollectionImpl() {
+BalloonCollection::~BalloonCollection() {
 }
-
-void BalloonCollectionImpl::Add(const Notification& notification,
-                                Profile* profile) {
-  Balloon* new_balloon = MakeBalloon(notification, profile);
-  // The +1 on width is necessary because width is fixed on notifications,
-  // so since we always have the max size, we would always hit the scrollbar
-  // condition.  We are only interested in comparing height to maximum.
-  new_balloon->set_min_scrollbar_size(gfx::Size(1 + layout_.max_balloon_width(),
-                                                layout_.max_balloon_height()));
-  new_balloon->SetPosition(layout_.OffScreenLocation(), false);
-  new_balloon->Show();
-#if USE_OFFSETS
-  int count = base_.count();
-  if (count > 0 && layout_.RequiresOffsets())
-    new_balloon->set_offset(base_.balloons()[count - 1]->offset());
-#endif
-  base_.Add(new_balloon);
-  PositionBalloons(false);
-
-  // There may be no listener in a unit test.
-  if (space_change_listener_)
-    space_change_listener_->OnBalloonSpaceChanged();
-
-  // This is used only for testing.
-  if (on_collection_changed_callback_.get())
-    on_collection_changed_callback_->Run();
-}
-
-bool BalloonCollectionImpl::RemoveById(const std::string& id) {
-  return base_.CloseById(id);
-}
-
-bool BalloonCollectionImpl::RemoveBySourceOrigin(const GURL& origin) {
-  return base_.CloseAllBySourceOrigin(origin);
-}
-
-void BalloonCollectionImpl::RemoveAll() {
-  base_.CloseAll();
-}
-
-bool BalloonCollectionImpl::HasSpace() const {
-  int count = base_.count();
-  if (count < kMinAllowedBalloonCount)
-    return true;
-
-  int max_balloon_size = 0;
-  int total_size = 0;
-  layout_.GetMaxLinearSize(&max_balloon_size, &total_size);
-
-  int current_max_size = max_balloon_size * count;
-  int max_allowed_size = static_cast<int>(total_size *
-                                          kPercentBalloonFillFactor);
-  return current_max_size < max_allowed_size - max_balloon_size;
-}
-
-void BalloonCollectionImpl::ResizeBalloon(Balloon* balloon,
-                                          const gfx::Size& size) {
-  balloon->set_content_size(Layout::ConstrainToSizeLimits(size));
-  PositionBalloons(true);
-}
-
-void BalloonCollectionImpl::DisplayChanged() {
-  layout_.RefreshSystemMetrics();
-  PositionBalloons(true);
-}
-
-void BalloonCollectionImpl::OnBalloonClosed(Balloon* source) {
-  // We want to free the balloon when finished.
-  const Balloons& balloons = base_.balloons();
-  Balloons::const_iterator it = balloons.begin();
-
-#if USE_OFFSETS
-  if (layout_.RequiresOffsets()) {
-    gfx::Point offset;
-    bool apply_offset = false;
-    while (it != balloons.end()) {
-      if (*it == source) {
-        ++it;
-        if (it != balloons.end()) {
-          apply_offset = true;
-          offset.set_y((source)->offset().y() - (*it)->offset().y() +
-              (*it)->content_size().height() - source->content_size().height());
-        }
-      } else {
-        if (apply_offset)
-          (*it)->add_offset(offset);
-        ++it;
-      }
-    }
-    // Start listening for UI events so we cancel the offset when the mouse
-    // leaves the balloon area.
-    if (apply_offset)
-      AddMessageLoopObserver();
-  }
-#endif
-
-  base_.Remove(source);
-  PositionBalloons(true);
-
-  // There may be no listener in a unit test.
-  if (space_change_listener_)
-    space_change_listener_->OnBalloonSpaceChanged();
-
-  // This is used only for testing.
-  if (on_collection_changed_callback_.get())
-    on_collection_changed_callback_->Run();
-}
-
-void BalloonCollectionImpl::PositionBalloonsInternal(bool reposition) {
-  const Balloons& balloons = base_.balloons();
-
-  layout_.RefreshSystemMetrics();
-  gfx::Point origin = layout_.GetLayoutOrigin();
-  for (Balloons::const_iterator it = balloons.begin();
-       it != balloons.end();
-       ++it) {
-    gfx::Point upper_left = layout_.NextPosition((*it)->GetViewSize(), &origin);
-    (*it)->SetPosition(upper_left, reposition);
-  }
-}
-
-gfx::Rect BalloonCollectionImpl::GetBalloonsBoundingBox() const {
-  // Start from the layout origin.
-  gfx::Rect bounds = gfx::Rect(layout_.GetLayoutOrigin(), gfx::Size(0, 0));
-
-  // For each balloon, extend the rectangle.  This approach is indifferent to
-  // the orientation of the balloons.
-  const Balloons& balloons = base_.balloons();
-  Balloons::const_iterator iter;
-  for (iter = balloons.begin(); iter != balloons.end(); ++iter) {
-    gfx::Rect balloon_box = gfx::Rect((*iter)->GetPosition(),
-                                      (*iter)->GetViewSize());
-    bounds = bounds.Union(balloon_box);
-  }
-
-  return bounds;
-}
-
-#if USE_OFFSETS
-void BalloonCollectionImpl::AddMessageLoopObserver() {
-  if (!added_as_message_loop_observer_) {
-    MessageLoopForUI::current()->AddObserver(this);
-    added_as_message_loop_observer_ = true;
-  }
-}
-
-void BalloonCollectionImpl::RemoveMessageLoopObserver() {
-  if (added_as_message_loop_observer_) {
-    MessageLoopForUI::current()->RemoveObserver(this);
-    added_as_message_loop_observer_ = false;
-  }
-}
-
-void BalloonCollectionImpl::CancelOffsets() {
-  reposition_factory_.RevokeAll();
-
-  // Unhook from listening to all UI events.
-  RemoveMessageLoopObserver();
-
-  const Balloons& balloons = base_.balloons();
-  for (Balloons::const_iterator it = balloons.begin();
-       it != balloons.end();
-       ++it)
-    (*it)->set_offset(gfx::Point(0, 0));
-
-  PositionBalloons(true);
-}
-
-void BalloonCollectionImpl::HandleMouseMoveEvent() {
-  if (!IsCursorInBalloonCollection()) {
-    // Mouse has left the region.  Schedule a reposition after
-    // a short delay.
-    if (reposition_factory_.empty()) {
-      MessageLoop::current()->PostDelayedTask(
-          FROM_HERE,
-          reposition_factory_.NewRunnableMethod(
-              &BalloonCollectionImpl::CancelOffsets),
-          kRepositionDelay);
-    }
-  } else {
-    // Mouse moved back into the region.  Cancel the reposition.
-    reposition_factory_.RevokeAll();
-  }
-}
-#endif
-
-BalloonCollectionImpl::Layout::Layout() {
-  RefreshSystemMetrics();
-}
-
-void BalloonCollectionImpl::Layout::GetMaxLinearSize(int* max_balloon_size,
-                                                     int* total_size) const {
-  DCHECK(max_balloon_size && total_size);
-
-  // All placement schemes are vertical, so we only care about height.
-  *total_size = work_area_.height();
-  *max_balloon_size = max_balloon_height();
-}
-
-gfx::Point BalloonCollectionImpl::Layout::GetLayoutOrigin() const {
-  int x = 0;
-  int y = 0;
-  switch (placement_) {
-    case VERTICALLY_FROM_TOP_LEFT:
-      x = work_area_.x() + HorizontalEdgeMargin();
-      y = work_area_.y() + VerticalEdgeMargin();
-      break;
-    case VERTICALLY_FROM_TOP_RIGHT:
-      x = work_area_.right() - HorizontalEdgeMargin();
-      y = work_area_.y() + VerticalEdgeMargin();
-      break;
-    case VERTICALLY_FROM_BOTTOM_LEFT:
-      x = work_area_.x() + HorizontalEdgeMargin();
-      y = work_area_.bottom() - VerticalEdgeMargin();
-      break;
-    case VERTICALLY_FROM_BOTTOM_RIGHT:
-      x = work_area_.right() - HorizontalEdgeMargin();
-      y = work_area_.bottom() - VerticalEdgeMargin();
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-  return gfx::Point(x, y);
-}
-
-gfx::Point BalloonCollectionImpl::Layout::NextPosition(
-    const gfx::Size& balloon_size,
-    gfx::Point* position_iterator) const {
-  DCHECK(position_iterator);
-
-  int x = 0;
-  int y = 0;
-  switch (placement_) {
-    case VERTICALLY_FROM_TOP_LEFT:
-      x = position_iterator->x();
-      y = position_iterator->y();
-      position_iterator->set_y(position_iterator->y() + balloon_size.height() +
-                               InterBalloonMargin());
-      break;
-    case VERTICALLY_FROM_TOP_RIGHT:
-      x = position_iterator->x() - balloon_size.width();
-      y = position_iterator->y();
-      position_iterator->set_y(position_iterator->y() + balloon_size.height() +
-                               InterBalloonMargin());
-      break;
-    case VERTICALLY_FROM_BOTTOM_LEFT:
-      position_iterator->set_y(position_iterator->y() - balloon_size.height() -
-                               InterBalloonMargin());
-      x = position_iterator->x();
-      y = position_iterator->y();
-      break;
-    case VERTICALLY_FROM_BOTTOM_RIGHT:
-      position_iterator->set_y(position_iterator->y() - balloon_size.height() -
-                               InterBalloonMargin());
-      x = position_iterator->x() - balloon_size.width();
-      y = position_iterator->y();
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-  return gfx::Point(x, y);
-}
-
-gfx::Point BalloonCollectionImpl::Layout::OffScreenLocation() const {
-  int x = 0;
-  int y = 0;
-  switch (placement_) {
-    case VERTICALLY_FROM_TOP_LEFT:
-      x = work_area_.x() + HorizontalEdgeMargin();
-      y = work_area_.y() + kBalloonMaxHeight + VerticalEdgeMargin();
-      break;
-    case VERTICALLY_FROM_TOP_RIGHT:
-      x = work_area_.right() - kBalloonMaxWidth - HorizontalEdgeMargin();
-      y = work_area_.y() + kBalloonMaxHeight + VerticalEdgeMargin();
-      break;
-    case VERTICALLY_FROM_BOTTOM_LEFT:
-      x = work_area_.x() + HorizontalEdgeMargin();
-      y = work_area_.bottom() + kBalloonMaxHeight + VerticalEdgeMargin();
-      break;
-    case VERTICALLY_FROM_BOTTOM_RIGHT:
-      x = work_area_.right() - kBalloonMaxWidth - HorizontalEdgeMargin();
-      y = work_area_.bottom() + kBalloonMaxHeight + VerticalEdgeMargin();
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-  return gfx::Point(x, y);
-}
-
-bool BalloonCollectionImpl::Layout::RequiresOffsets() const {
-  // Layout schemes that grow up from the bottom require offsets;
-  // schemes that grow down do not require offsets.
-  bool offsets = (placement_ == VERTICALLY_FROM_BOTTOM_LEFT ||
-                  placement_ == VERTICALLY_FROM_BOTTOM_RIGHT);
-
-#if defined(OS_MACOSX)
-  // These schemes are in screen-coordinates, and top and bottom
-  // are inverted on Mac.
-  offsets = !offsets;
-#endif
-
-  return offsets;
-}
-
-// static
-gfx::Size BalloonCollectionImpl::Layout::ConstrainToSizeLimits(
-    const gfx::Size& size) {
-  // restrict to the min & max sizes
-  return gfx::Size(
-      std::max(min_balloon_width(),
-               std::min(max_balloon_width(), size.width())),
-      std::max(min_balloon_height(),
-               std::min(max_balloon_height(), size.height())));
-}
-
-bool BalloonCollectionImpl::Layout::RefreshSystemMetrics() {
-  bool changed = false;
-
-#if defined(OS_MACOSX)
-  gfx::Rect new_work_area = GetMacWorkArea();
-#else
-  scoped_ptr<WindowSizer::MonitorInfoProvider> info_provider(
-      WindowSizer::CreateDefaultMonitorInfoProvider());
-  gfx::Rect new_work_area = info_provider->GetPrimaryMonitorWorkArea();
-#endif
-  if (!work_area_.Equals(new_work_area)) {
-    work_area_.SetRect(new_work_area.x(), new_work_area.y(),
-                       new_work_area.width(), new_work_area.height());
-    changed = true;
-  }
-
-  return changed;
-}