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// 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 "ash/drag_drop/drag_drop_controller.h"
#include "ash/drag_drop/drag_image_view.h"
#include "base/message_loop.h"
#include "ui/aura/client/drag_drop_delegate.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/aura_shell/shell.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/os_exchange_data_provider_aura.h"
#include "ui/gfx/point.h"
#include "ui/gfx/rect.h"
#include "ui/views/widget/native_widget_aura.h"
namespace aura_shell {
namespace internal {
using aura::RootWindow;
namespace {
const gfx::Point kDragDropWidgetOffset(0, 0);
}
////////////////////////////////////////////////////////////////////////////////
// DragDropController, public:
DragDropController::DragDropController()
: aura::EventFilter(RootWindow::GetInstance()),
drag_image_(NULL),
drag_data_(NULL),
drag_operation_(0),
dragged_window_(NULL),
drag_drop_in_progress_(false),
should_block_during_drag_drop_(true) {
Shell::GetInstance()->AddRootWindowEventFilter(this);
aura::client::SetDragDropClient(this);
}
DragDropController::~DragDropController() {
Shell::GetInstance()->RemoveRootWindowEventFilter(this);
Cleanup();
}
int DragDropController::StartDragAndDrop(const ui::OSExchangeData& data,
int operation) {
DCHECK(!drag_drop_in_progress_);
aura::Window* capture_window = RootWindow::GetInstance()->capture_window();
if (capture_window)
RootWindow::GetInstance()->ReleaseCapture(capture_window);
drag_drop_in_progress_ = true;
drag_data_ = &data;
drag_operation_ = operation;
gfx::Point location = RootWindow::GetInstance()->last_mouse_location();
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(location.Add(kDragDropWidgetOffset),
drag_image_->GetPreferredSize()));
drag_image_->SetWidgetVisible(true);
dragged_window_ = NULL;
if (should_block_during_drag_drop_) {
MessageLoopForUI::current()->RunWithDispatcher(
RootWindow::GetInstance()->GetDispatcher());
}
return drag_operation_;
}
void DragDropController::DragUpdate(aura::Window* target,
const aura::MouseEvent& event) {
aura::client::DragDropDelegate* delegate = NULL;
if (target != dragged_window_) {
if (dragged_window_ &&
(delegate = aura::client::GetDragDropDelegate(dragged_window_))) {
delegate->OnDragExited();
}
dragged_window_ = target;
if ((delegate = aura::client::GetDragDropDelegate(dragged_window_))) {
aura::DropTargetEvent e(*drag_data_, event.location(), drag_operation_);
delegate->OnDragEntered(e);
}
} else {
if ((delegate = aura::client::GetDragDropDelegate(dragged_window_))) {
aura::DropTargetEvent e(*drag_data_, event.location(), drag_operation_);
int op = delegate->OnDragUpdated(e);
gfx::NativeCursor cursor = (op == ui::DragDropTypes::DRAG_NONE)?
aura::kCursorMove : aura::kCursorHand;
RootWindow::GetInstance()->SetCursor(cursor);
}
}
DCHECK(drag_image_.get());
if (drag_image_->visible()) {
drag_image_->SetScreenPosition(RootWindow::GetInstance()->
last_mouse_location().Add(kDragDropWidgetOffset));
}
}
void DragDropController::Drop(aura::Window* target,
const aura::MouseEvent& event) {
aura::client::DragDropDelegate* delegate = NULL;
DCHECK(target == dragged_window_);
if ((delegate = aura::client::GetDragDropDelegate(dragged_window_))) {
aura::DropTargetEvent e(*drag_data_, event.location(), drag_operation_);
drag_operation_ = delegate->OnPerformDrop(e);
// TODO(varunjain): if drag_op is 0, do drag widget flying back animation
}
Cleanup();
if (should_block_during_drag_drop_)
MessageLoop::current()->Quit();
}
void DragDropController::DragCancel() {
// TODO(varunjain): Do drag widget flying back animation
Cleanup();
drag_operation_ = 0;
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:
NOTREACHED();
break;
}
return true;
}
ui::TouchStatus DragDropController::PreHandleTouchEvent(
aura::Window* target,
aura::TouchEvent* event) {
return ui::TOUCH_STATUS_UNKNOWN;
}
////////////////////////////////////////////////////////////////////////////////
// DragDropController, private:
void DragDropController::Cleanup() {
drag_image_.reset();
drag_data_ = NULL;
drag_drop_in_progress_ = false;
}
} // namespace internal
} // namespace aura_shell
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