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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 "ui/views/widget/drop_helper.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
namespace views {
DropHelper::DropHelper(View* root_view)
: root_view_(root_view),
target_view_(NULL),
deepest_view_(NULL) {
}
DropHelper::~DropHelper() {
}
void DropHelper::ResetTargetViewIfEquals(View* view) {
if (target_view_ == view)
target_view_ = NULL;
if (deepest_view_ == view)
deepest_view_ = NULL;
}
int DropHelper::OnDragOver(const OSExchangeData& data,
const gfx::Point& root_view_location,
int drag_operation) {
View* view = CalculateTargetViewImpl(root_view_location, data, true,
&deepest_view_);
if (view != target_view_) {
// Target changed notify old drag exited, then new drag entered.
NotifyDragExit();
target_view_ = view;
NotifyDragEntered(data, root_view_location, drag_operation);
}
return NotifyDragOver(data, root_view_location, drag_operation);
}
void DropHelper::OnDragExit() {
NotifyDragExit();
deepest_view_ = target_view_ = NULL;
}
int DropHelper::OnDrop(const OSExchangeData& data,
const gfx::Point& root_view_location,
int drag_operation) {
View* drop_view = target_view_;
deepest_view_ = target_view_ = NULL;
if (!drop_view)
return ui::DragDropTypes::DRAG_NONE;
if (drag_operation == ui::DragDropTypes::DRAG_NONE) {
drop_view->OnDragExited();
return ui::DragDropTypes::DRAG_NONE;
}
gfx::Point view_location(root_view_location);
View* root_view = drop_view->GetWidget()->GetRootView();
View::ConvertPointToTarget(root_view, drop_view, &view_location);
ui::DropTargetEvent drop_event(data, view_location, view_location,
drag_operation);
return drop_view->OnPerformDrop(drop_event);
}
View* DropHelper::CalculateTargetView(
const gfx::Point& root_view_location,
const OSExchangeData& data,
bool check_can_drop) {
return CalculateTargetViewImpl(root_view_location, data, check_can_drop,
NULL);
}
View* DropHelper::CalculateTargetViewImpl(
const gfx::Point& root_view_location,
const OSExchangeData& data,
bool check_can_drop,
View** deepest_view) {
View* view = root_view_->GetEventHandlerForPoint(root_view_location);
if (view == deepest_view_) {
// The view the mouse is over hasn't changed; reuse the target.
return target_view_;
}
if (deepest_view)
*deepest_view = view;
// TODO(sky): for the time being these are separate. Once I port chrome menu
// I can switch to the #else implementation and nuke the OS_WIN
// implementation.
#if defined(OS_WIN)
// View under mouse changed, which means a new view may want the drop.
// Walk the tree, stopping at target_view_ as we know it'll accept the
// drop.
while (view && view != target_view_ &&
(!view->enabled() || !view->CanDrop(data))) {
view = view->parent();
}
#else
int formats = 0;
std::set<OSExchangeData::CustomFormat> custom_formats;
while (view && view != target_view_) {
if (view->enabled() &&
view->GetDropFormats(&formats, &custom_formats) &&
data.HasAnyFormat(formats, custom_formats) &&
(!check_can_drop || view->CanDrop(data))) {
// Found the view.
return view;
}
formats = 0;
custom_formats.clear();
view = view->parent();
}
#endif
return view;
}
void DropHelper::NotifyDragEntered(const OSExchangeData& data,
const gfx::Point& root_view_location,
int drag_operation) {
if (!target_view_)
return;
gfx::Point target_view_location(root_view_location);
View::ConvertPointToTarget(root_view_, target_view_, &target_view_location);
ui::DropTargetEvent enter_event(data,
target_view_location,
target_view_location,
drag_operation);
target_view_->OnDragEntered(enter_event);
}
int DropHelper::NotifyDragOver(const OSExchangeData& data,
const gfx::Point& root_view_location,
int drag_operation) {
if (!target_view_)
return ui::DragDropTypes::DRAG_NONE;
gfx::Point target_view_location(root_view_location);
View::ConvertPointToTarget(root_view_, target_view_, &target_view_location);
ui::DropTargetEvent enter_event(data,
target_view_location,
target_view_location,
drag_operation);
return target_view_->OnDragUpdated(enter_event);
}
void DropHelper::NotifyDragExit() {
if (target_view_)
target_view_->OnDragExited();
}
} // namespace views
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