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// 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.
#include "chrome/browser/notifications/balloon_collection.h"
#include "base/gfx/rect.h"
#include "base/logging.h"
#include "base/stl_util-inl.h"
#include "chrome/browser/notifications/balloon.h"
#include "chrome/browser/window_sizer.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;
// Margin from the edge of the work area
const int kVerticalEdgeMargin = 5;
const int kHorizontalEdgeMargin = 5;
// Space between balloons.
const int kInterBalloonMargin = 5;
} // namespace
// static
BalloonCollectionImpl::Layout::Placement
BalloonCollectionImpl::Layout::placement_ =
Layout::VERTICALLY_FROM_BOTTOM_RIGHT;
BalloonCollectionImpl::BalloonCollectionImpl()
: space_change_listener_(NULL) {
}
BalloonCollectionImpl::~BalloonCollectionImpl() {
STLDeleteElements(&balloons_);
}
void BalloonCollectionImpl::Add(const Notification& notification,
Profile* profile) {
Balloon* new_balloon = MakeBalloon(notification, profile);
balloons_.push_back(new_balloon);
PositionBalloons(false);
new_balloon->Show();
// There may be no listener in a unit test.
if (space_change_listener_)
space_change_listener_->OnBalloonSpaceChanged();
}
bool BalloonCollectionImpl::Remove(const Notification& notification) {
Balloons::iterator iter;
for (iter = balloons_.begin(); iter != balloons_.end(); ++iter) {
if (notification.IsSame((*iter)->notification())) {
// Balloon.CloseByScript() will cause OnBalloonClosed() to be called on
// this object, which will remove it from the collection and free it.
(*iter)->CloseByScript();
return true;
}
}
return false;
}
bool BalloonCollectionImpl::HasSpace() const {
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) {
// restrict to the min & max sizes
gfx::Size real_size(
std::max(Layout::min_balloon_width(),
std::min(Layout::max_balloon_width(), size.width())),
std::max(Layout::min_balloon_height(),
std::min(Layout::max_balloon_height(), size.height())));
balloon->set_content_size(real_size);
PositionBalloons(true);
}
void BalloonCollectionImpl::OnBalloonClosed(Balloon* source) {
// We want to free the balloon when finished.
scoped_ptr<Balloon> closed(source);
for (Balloons::iterator it = balloons_.begin(); it != balloons_.end(); ++it) {
if (*it == source) {
balloons_.erase(it);
break;
}
}
PositionBalloons(true);
// There may be no listener in a unit test.
if (space_change_listener_)
space_change_listener_->OnBalloonSpaceChanged();
}
void BalloonCollectionImpl::PositionBalloons(bool reposition) {
gfx::Point origin = layout_.GetLayoutOrigin();
for (Balloons::iterator it = balloons_.begin(); it != balloons_.end(); ++it) {
gfx::Point upper_left = layout_.NextPosition((*it)->GetViewSize(), &origin);
(*it)->SetPosition(upper_left, reposition);
}
}
BalloonCollectionImpl::Layout::Layout() {
RefreshSystemMetrics();
}
const void BalloonCollectionImpl::Layout::GetMaxLinearSize(
int* max_balloon_size,
int* total_size) const {
DCHECK(max_balloon_size && total_size);
switch (placement_) {
case HORIZONTALLY_FROM_BOTTOM_LEFT:
case HORIZONTALLY_FROM_BOTTOM_RIGHT:
*total_size = work_area_.width();
*max_balloon_size = max_balloon_width();
break;
case VERTICALLY_FROM_TOP_RIGHT:
case VERTICALLY_FROM_BOTTOM_RIGHT:
*total_size = work_area_.height();
*max_balloon_size = max_balloon_height();
break;
default:
NOTREACHED();
break;
}
}
gfx::Point BalloonCollectionImpl::Layout::GetLayoutOrigin() const {
int x = 0;
int y = 0;
switch (placement_) {
case HORIZONTALLY_FROM_BOTTOM_LEFT:
x = work_area_.x() + kHorizontalEdgeMargin;
y = work_area_.bottom() - kVerticalEdgeMargin;
break;
case HORIZONTALLY_FROM_BOTTOM_RIGHT:
x = work_area_.right() - kHorizontalEdgeMargin;
y = work_area_.bottom() - kVerticalEdgeMargin;
break;
case VERTICALLY_FROM_TOP_RIGHT:
x = work_area_.right() - kHorizontalEdgeMargin;
y = work_area_.y() + kVerticalEdgeMargin;
break;
case VERTICALLY_FROM_BOTTOM_RIGHT:
x = work_area_.right() - kHorizontalEdgeMargin;
y = work_area_.bottom() - kVerticalEdgeMargin;
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 HORIZONTALLY_FROM_BOTTOM_LEFT:
x = position_iterator->x();
y = position_iterator->y() - balloon_size.height();
position_iterator->set_x(position_iterator->x() + balloon_size.width() +
kInterBalloonMargin);
break;
case HORIZONTALLY_FROM_BOTTOM_RIGHT:
position_iterator->set_x(position_iterator->x() - balloon_size.width() -
kInterBalloonMargin);
x = position_iterator->x();
y = position_iterator->y() - balloon_size.height();
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() +
kInterBalloonMargin);
break;
case VERTICALLY_FROM_BOTTOM_RIGHT:
position_iterator->set_y(position_iterator->y() - balloon_size.height() -
kInterBalloonMargin);
x = position_iterator->x() - balloon_size.width();
y = position_iterator->y();
break;
default:
NOTREACHED();
break;
}
return gfx::Point(x, y);
}
bool BalloonCollectionImpl::Layout::RefreshSystemMetrics() {
bool changed = false;
scoped_ptr<WindowSizer::MonitorInfoProvider> info_provider(
WindowSizer::CreateDefaultMonitorInfoProvider());
gfx::Rect new_work_area = info_provider->GetPrimaryMonitorWorkArea();
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;
}
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