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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/drag_drop/drag_drop_controller.h"
#include "ash/drag_drop/drag_image_view.h"
#include "ash/shell.h"
#include "base/message_loop.h"
#include "ui/aura/client/drag_drop_delegate.h"
#include "ui/aura/env.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/os_exchange_data_provider_aura.h"
#include "ui/gfx/compositor/layer.h"
#include "ui/gfx/compositor/layer_animator.h"
#include "ui/gfx/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/point.h"
#include "ui/gfx/rect.h"
#include "ui/views/views_delegate.h"
#include "ui/views/widget/native_widget_aura.h"
namespace ash {
namespace internal {
using aura::RootWindow;
namespace {
const gfx::Point kDragDropWidgetOffset(0, 0);
const base::TimeDelta kDragDropAnimationDuration =
base::TimeDelta::FromMilliseconds(250);
} // namespace
////////////////////////////////////////////////////////////////////////////////
// DragDropController, public:
DragDropController::DragDropController()
: drag_image_(NULL),
drag_data_(NULL),
drag_operation_(0),
drag_window_(NULL),
drag_drop_in_progress_(false),
should_block_during_drag_drop_(true) {
Shell::GetInstance()->AddRootWindowEventFilter(this);
aura::client::SetDragDropClient(Shell::GetRootWindow(), this);
}
DragDropController::~DragDropController() {
Shell::GetInstance()->RemoveRootWindowEventFilter(this);
Cleanup();
if (drag_image_.get())
drag_image_.reset();
}
int DragDropController::StartDragAndDrop(const ui::OSExchangeData& data,
const gfx::Point& root_location,
int operation) {
DCHECK(!drag_drop_in_progress_);
aura::Window* capture_window = Shell::GetRootWindow()->capture_window();
if (capture_window)
Shell::GetRootWindow()->ReleaseCapture(capture_window);
drag_drop_in_progress_ = true;
drag_data_ = &data;
drag_operation_ = operation;
const ui::OSExchangeDataProviderAura& provider =
static_cast<const ui::OSExchangeDataProviderAura&>(data.provider());
drag_image_.reset(new DragImageView);
drag_image_->SetImage(provider.drag_image());
drag_image_->SetScreenBounds(gfx::Rect(
root_location.Add(kDragDropWidgetOffset),
drag_image_->GetPreferredSize()));
drag_image_->SetWidgetVisible(true);
drag_window_ = NULL;
drag_start_location_ = root_location;
#if !defined(OS_MACOSX)
if (should_block_during_drag_drop_) {
MessageLoopForUI* loop = MessageLoopForUI::current();
MessageLoop::ScopedNestableTaskAllower allow_nested(loop);
loop->RunWithDispatcher(aura::Env::GetInstance()->GetDispatcher());
}
#endif // !defined(OS_MACOSX)
return drag_operation_;
}
void DragDropController::DragUpdate(aura::Window* target,
const aura::LocatedEvent& event) {
aura::client::DragDropDelegate* delegate = NULL;
if (target != drag_window_) {
if (drag_window_) {
if ((delegate = aura::client::GetDragDropDelegate(drag_window_)))
delegate->OnDragExited();
drag_window_->RemoveObserver(this);
}
drag_window_ = target;
drag_window_->AddObserver(this);
if ((delegate = aura::client::GetDragDropDelegate(drag_window_))) {
aura::DropTargetEvent e(*drag_data_,
event.location(),
event.root_location(),
drag_operation_);
delegate->OnDragEntered(e);
}
} else {
if ((delegate = aura::client::GetDragDropDelegate(drag_window_))) {
aura::DropTargetEvent e(*drag_data_,
event.location(),
event.root_location(),
drag_operation_);
int op = delegate->OnDragUpdated(e);
gfx::NativeCursor cursor = (op == ui::DragDropTypes::DRAG_NONE)?
ui::kCursorMove : ui::kCursorHand;
Shell::GetRootWindow()->SetCursor(cursor);
}
}
DCHECK(drag_image_.get());
if (drag_image_->visible()) {
drag_image_->SetScreenPosition(
event.root_location().Add(kDragDropWidgetOffset));
}
}
void DragDropController::Drop(aura::Window* target,
const aura::LocatedEvent& event) {
Shell::GetRootWindow()->SetCursor(ui::kCursorPointer);
aura::client::DragDropDelegate* delegate = NULL;
// |drag_window_| can be NULL if we have just started the drag and have not
// received any DragUpdates, or, if the |drag_window_| gets destroyed during
// a drag/drop. Otherwise, target should be equal to the |drag_window_|.
DCHECK(target == drag_window_ || !drag_window_);
if ((delegate = aura::client::GetDragDropDelegate(target))) {
aura::DropTargetEvent e(
*drag_data_, event.location(), event.root_location(), drag_operation_);
drag_operation_ = delegate->OnPerformDrop(e);
if (drag_operation_ == 0)
StartCanceledAnimation();
else
drag_image_.reset();
} else {
drag_image_.reset();
}
Cleanup();
if (should_block_during_drag_drop_)
MessageLoop::current()->Quit();
}
void DragDropController::DragCancel() {
Shell::GetRootWindow()->SetCursor(ui::kCursorPointer);
aura::client::DragDropDelegate* delegate = NULL;
if ((delegate = aura::client::GetDragDropDelegate(drag_window_))) {
delegate->OnDragExited();
}
Cleanup();
drag_operation_ = 0;
StartCanceledAnimation();
if (should_block_during_drag_drop_)
MessageLoop::current()->Quit();
}
bool DragDropController::IsDragDropInProgress() {
return drag_drop_in_progress_;
}
bool DragDropController::PreHandleKeyEvent(aura::Window* target,
aura::KeyEvent* event) {
return false;
}
bool DragDropController::PreHandleMouseEvent(aura::Window* target,
aura::MouseEvent* event) {
if (!drag_drop_in_progress_)
return false;
switch (event->type()) {
case ui::ET_MOUSE_DRAGGED:
DragUpdate(target, *event);
break;
case ui::ET_MOUSE_RELEASED:
Drop(target, *event);
break;
case ui::ET_MOUSE_EXITED:
DragCancel();
break;
default:
// We could reach here if the user drops outside the root window.
// We could also reach here because RootWindow may sometimes generate a
// bunch of fake mouse events
// (aura::RootWindow::PostMouseMoveEventAfterWindowChange).
break;
}
return true;
}
ui::TouchStatus DragDropController::PreHandleTouchEvent(
aura::Window* target,
aura::TouchEvent* event) {
// TODO(sad): Also check for the touch-id.
if (!drag_drop_in_progress_)
return ui::TOUCH_STATUS_UNKNOWN;
switch (event->type()) {
case ui::ET_TOUCH_MOVED:
DragUpdate(target, *event);
break;
case ui::ET_TOUCH_RELEASED:
Drop(target, *event);
break;
case ui::ET_TOUCH_CANCELLED:
DragCancel();
break;
default:
return ui::TOUCH_STATUS_UNKNOWN;
}
return ui::TOUCH_STATUS_CONTINUE;
}
ui::GestureStatus DragDropController::PreHandleGestureEvent(
aura::Window* target,
aura::GestureEvent* event) {
return ui::GESTURE_STATUS_UNKNOWN;
}
void DragDropController::OnWindowDestroyed(aura::Window* window) {
if (drag_window_ == window) {
drag_window_->RemoveObserver(this);
drag_window_ = NULL;
}
}
////////////////////////////////////////////////////////////////////////////////
// DragDropController, private:
void DragDropController::OnImplicitAnimationsCompleted() {
DCHECK(drag_image_.get());
drag_image_.reset();
}
void DragDropController::StartCanceledAnimation() {
aura::Window* window = drag_image_->GetWidget()->GetNativeView();
ui::LayerAnimator* animator = window->layer()->GetAnimator();
animator->set_preemption_strategy(
ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
// Stop waiting for any as yet unfinished implicit animations.
StopObservingImplicitAnimations();
ui::ScopedLayerAnimationSettings animation_setter(animator);
animation_setter.SetTransitionDuration(kDragDropAnimationDuration);
animation_setter.AddObserver(this);
window->SetBounds(gfx::Rect(drag_start_location_, window->bounds().size()));
}
void DragDropController::Cleanup() {
if (drag_window_)
drag_window_->RemoveObserver(this);
drag_window_ = NULL;
drag_data_ = NULL;
drag_drop_in_progress_ = false;
}
} // namespace internal
} // namespace ash
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