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// 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 "ash/wm/gestures/system_pinch_handler.h"
#include "ash/launcher/launcher.h"
#include "ash/screen_ash.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/wm/property_util.h"
#include "ash/wm/window_util.h"
#include "ash/wm/workspace/snap_sizer.h"
#include "ui/aura/window.h"
#include "ui/base/events/event_constants.h"
#include "ui/base/gestures/gesture_types.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/rect.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_delegate.h"
const double kPinchThresholdForMaximize = 1.5;
const double kPinchThresholdForMinimize = 0.7;
namespace ash {
namespace internal {
const int SystemPinchHandler::kSystemGesturePoints = 4;
SystemPinchHandler::SystemPinchHandler(aura::Window* target)
: target_(target),
phantom_(target),
phantom_state_(PHANTOM_WINDOW_NORMAL),
pinch_factor_(1.) {
widget_ = views::Widget::GetWidgetForNativeWindow(target_);
}
SystemPinchHandler::~SystemPinchHandler() {
}
SystemGestureStatus SystemPinchHandler::ProcessGestureEvent(
const ui::GestureEvent& event) {
// The target has changed, somehow. Let's bale.
if (!widget_ || !widget_->widget_delegate()->CanResize())
return SYSTEM_GESTURE_END;
switch (event.type()) {
case ui::ET_GESTURE_END: {
if (event.details().touch_points() > kSystemGesturePoints)
break;
if (phantom_state_ == PHANTOM_WINDOW_MAXIMIZED) {
if (!wm::IsWindowMaximized(target_) &&
!wm::IsWindowFullscreen(target_))
wm::MaximizeWindow(target_);
} else if (phantom_state_ == PHANTOM_WINDOW_MINIMIZED) {
if (wm::IsWindowMaximized(target_) ||
wm::IsWindowFullscreen(target_)) {
wm::RestoreWindow(target_);
} else {
wm::MinimizeWindow(target_);
// NOTE: Minimizing the window will cause this handler to be
// destroyed. So do not access anything from |this| from here.
return SYSTEM_GESTURE_END;
}
}
return SYSTEM_GESTURE_END;
}
case ui::ET_GESTURE_PINCH_UPDATE: {
// The PINCH_UPDATE events contain incremental scaling updates.
pinch_factor_ *= event.details().scale();
gfx::Rect bounds =
GetPhantomWindowScreenBounds(target_, event.location());
if (phantom_state_ != PHANTOM_WINDOW_NORMAL || phantom_.IsShowing())
phantom_.Show(bounds);
break;
}
case ui::ET_GESTURE_MULTIFINGER_SWIPE: {
phantom_.Hide();
pinch_factor_ = 1.0;
phantom_state_ = PHANTOM_WINDOW_NORMAL;
if (event.details().swipe_left() || event.details().swipe_right()) {
// Snap for left/right swipes.
ui::ScopedLayerAnimationSettings settings(
target_->layer()->GetAnimator());
internal::SnapSizer::SnapWindow(target_,
event.details().swipe_left() ? internal::SnapSizer::LEFT_EDGE :
internal::SnapSizer::RIGHT_EDGE);
} else if (event.details().swipe_up()) {
if (!wm::IsWindowMaximized(target_) &&
!wm::IsWindowFullscreen(target_))
wm::MaximizeWindow(target_);
} else if (event.details().swipe_down()) {
wm::MinimizeWindow(target_);
} else {
NOTREACHED() << "Swipe happened without a direction.";
}
break;
}
default:
break;
}
return SYSTEM_GESTURE_PROCESSED;
}
gfx::Rect SystemPinchHandler::GetPhantomWindowScreenBounds(
aura::Window* window,
const gfx::Point& point) {
if (pinch_factor_ > kPinchThresholdForMaximize) {
phantom_state_ = PHANTOM_WINDOW_MAXIMIZED;
return ScreenAsh::ConvertRectToScreen(
target_->parent(),
ScreenAsh::GetMaximizedWindowBoundsInParent(target_));
}
if (pinch_factor_ < kPinchThresholdForMinimize) {
if (wm::IsWindowMaximized(window) || wm::IsWindowFullscreen(window)) {
const gfx::Rect* restore = GetRestoreBoundsInScreen(window);
if (restore) {
phantom_state_ = PHANTOM_WINDOW_MINIMIZED;
return *restore;
}
return window->bounds();
}
Launcher* launcher = Launcher::ForWindow(window);
gfx::Rect rect = launcher->GetScreenBoundsOfItemIconForWindow(target_);
if (rect.IsEmpty())
rect = launcher->shelf_widget()->GetWindowBoundsInScreen();
else
rect.Inset(-8, -8);
phantom_state_ = PHANTOM_WINDOW_MINIMIZED;
return rect;
}
phantom_state_ = PHANTOM_WINDOW_NORMAL;
return window->bounds();
}
} // namespace internal
} // namespace ash
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