cef/cef1/libcef/web_drop_target_win.cc

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// Copyright (c) 2011 The Chromium Embedded Framework Authors.
// Portions 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 "libcef/web_drop_target_win.h"
#include <windows.h>
#include <shlobj.h>
#include "libcef/browser_impl.h"
#include "libcef/cef_context.h"
#include "libcef/drag_data_impl.h"
#include "libcef/web_drag_utils_win.h"
#include "googleurl/src/gurl.h"
#include "net/base/net_util.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebDragData.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebPoint.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
#include "ui/base/clipboard/clipboard_util_win.h"
#include "ui/base/dragdrop/os_exchange_data.h"
#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
#include "webkit/glue/webdropdata.h"
#include "webkit/glue/window_open_disposition.h"
using WebKit::WebDragOperation;
using WebKit::WebDragOperationNone;
using WebKit::WebDragOperationCopy;
using WebKit::WebDragOperationLink;
using WebKit::WebDragOperationMove;
using WebKit::WebDragOperationGeneric;
using WebKit::WebPoint;
using WebKit::WebView;
namespace {
// A helper method for getting the preferred drop effect.
DWORD GetPreferredDropEffect(DWORD effect) {
if (effect & DROPEFFECT_COPY)
return DROPEFFECT_COPY;
if (effect & DROPEFFECT_LINK)
return DROPEFFECT_LINK;
if (effect & DROPEFFECT_MOVE)
return DROPEFFECT_MOVE;
return DROPEFFECT_NONE;
}
} // namespace
WebDropTarget::WebDropTarget(CefBrowserImpl* browser)
: ui::DropTarget(browser->UIT_GetWebViewWndHandle()),
browser_(browser),
current_wvh_(NULL),
drag_cursor_(WebDragOperationNone),
canceled_(false) {
}
WebDropTarget::~WebDropTarget() {
}
DWORD WebDropTarget::OnDragEnter(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effects) {
current_wvh_ = _Context->current_webviewhost();
DCHECK(current_wvh_);
// TODO(tc): PopulateWebDropData can be slow depending on what is in the
// IDataObject. Maybe we can do this in a background thread.
WebDropData drop_data;
WebDropData::PopulateWebDropData(data_object, &drop_data);
// Clear the fields that are currently unused when dragging into WebKit.
// Remove these lines once PopulateWebDropData() is updated not to set them.
// See crbug.com/112255.
if (!drop_data.file_contents.empty())
drop_data.file_contents.clear();
if (!drop_data.file_description_filename.empty())
drop_data.file_description_filename.clear();
if (drop_data.url.is_empty())
ui::OSExchangeDataProviderWin::GetPlainTextURL(data_object, &drop_data.url);
WebKit::WebDragOperationsMask mask =
web_drag_utils_win::WinDragOpMaskToWebDragOpMask(effects);
canceled_ = false;
CefRefPtr<CefClient> client = browser_->GetClient();
if (client.get()) {
CefRefPtr<CefDragHandler> handler = client->GetDragHandler();
if (handler.get()) {
CefRefPtr<CefDragData> data(new CefDragDataImpl(drop_data));
if (handler->OnDragEnter(browser_, data,
static_cast<CefDragHandler::DragOperationsMask>(mask))) {
canceled_ = true;
return DROPEFFECT_NONE;
}
}
}
drag_cursor_ = WebDragOperationNone;
POINT client_pt = cursor_position;
ScreenToClient(GetHWND(), &client_pt);
WebDragOperation operation;
if (browser_->UIT_GetWebView()) {
operation = browser_->UIT_GetWebView()->dragTargetDragEnter(
drop_data.ToDragData(),
WebPoint(client_pt.x, client_pt.y),
WebPoint(cursor_position.x, cursor_position.y),
mask,
0);
} else {
operation = WebDragOperationNone;
}
return web_drag_utils_win::WebDragOpToWinDragOp(operation);
}
DWORD WebDropTarget::OnDragOver(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effects) {
DCHECK(current_wvh_);
if (current_wvh_ != _Context->current_webviewhost())
OnDragEnter(data_object, key_state, cursor_position, effects);
if (canceled_)
return DROPEFFECT_NONE;
POINT client_pt = cursor_position;
ScreenToClient(GetHWND(), &client_pt);
WebDragOperation operation;
if (browser_->UIT_GetWebView()) {
operation = browser_->UIT_GetWebView()->dragTargetDragOver(
WebPoint(client_pt.x, client_pt.y),
WebPoint(cursor_position.x, cursor_position.y),
web_drag_utils_win::WinDragOpMaskToWebDragOpMask(effects),
0);
} else {
operation = WebDragOperationNone;
}
return web_drag_utils_win::WebDragOpToWinDragOp(operation);
}
void WebDropTarget::OnDragLeave(IDataObject* data_object) {
DCHECK(current_wvh_);
if (current_wvh_ != _Context->current_webviewhost())
return;
if (canceled_)
return;
if (browser_->UIT_GetWebView())
browser_->UIT_GetWebView()->dragTargetDragLeave();
}
DWORD WebDropTarget::OnDrop(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect) {
DCHECK(current_wvh_);
if (current_wvh_ != _Context->current_webviewhost())
OnDragEnter(data_object, key_state, cursor_position, effect);
POINT client_pt = cursor_position;
ScreenToClient(GetHWND(), &client_pt);
browser_->set_is_dropping(true);
if (browser_->UIT_GetWebView()) {
browser_->UIT_GetWebView()->dragTargetDrop(
WebPoint(client_pt.x, client_pt.y),
WebPoint(cursor_position.x, cursor_position.y),
0);
}
browser_->set_is_dropping(false);
current_wvh_ = NULL;
// This isn't always correct, but at least it's a close approximation.
// For now, we always map a move to a copy to prevent potential data loss.
DWORD drop_effect = web_drag_utils_win::WebDragOpToWinDragOp(drag_cursor_);
return drop_effect != DROPEFFECT_MOVE ? drop_effect : DROPEFFECT_COPY;
}