Move the core drag&drop code for Windows to content\browser to match Mac/GTK. I've had to add tempo…

chrome/browser/tab_contents/web_drop_target_win.cc

-// 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 "chrome/browser/tab_contents/web_drop_target_win.h"
-
-#include <windows.h>
-#include <shlobj.h>
-
-#include "chrome/browser/tab_contents/web_drag_bookmark_handler_win.h"
-#include "chrome/browser/tab_contents/web_drag_utils_win.h"
-#include "content/browser/renderer_host/render_view_host.h"
-#include "content/browser/tab_contents/web_drag_dest_delegate.h"
-#include "content/public/browser/web_contents.h"
-#include "googleurl/src/gurl.h"
-#include "net/base/net_util.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 "ui/gfx/point.h"
-#include "webkit/glue/webdropdata.h"
-#include "webkit/glue/window_open_disposition.h"
-
-using WebKit::WebDragOperationNone;
-using WebKit::WebDragOperationCopy;
-using WebKit::WebDragOperationLink;
-using WebKit::WebDragOperationMove;
-using WebKit::WebDragOperationGeneric;
-using content::OpenURLParams;
-using content::Referrer;
-using content::WebContents;
-
-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
-
-// InterstitialDropTarget is like a ui::DropTarget implementation that
-// WebDropTarget passes through to if an interstitial is showing.  Rather than
-// passing messages on to the renderer, we just check to see if there's a link
-// in the drop data and handle links as navigations.
-class InterstitialDropTarget {
- public:
-  explicit InterstitialDropTarget(WebContents* web_contents)
-      : web_contents_(web_contents) {}
-
-  DWORD OnDragEnter(IDataObject* data_object, DWORD effect) {
-    return ui::ClipboardUtil::HasUrl(data_object) ?
-        GetPreferredDropEffect(effect) : DROPEFFECT_NONE;
-  }
-
-  DWORD OnDragOver(IDataObject* data_object, DWORD effect) {
-    return ui::ClipboardUtil::HasUrl(data_object) ?
-        GetPreferredDropEffect(effect) : DROPEFFECT_NONE;
-  }
-
-  void OnDragLeave(IDataObject* data_object) {
-  }
-
-  DWORD OnDrop(IDataObject* data_object, DWORD effect) {
-    if (!ui::ClipboardUtil::HasUrl(data_object))
-      return DROPEFFECT_NONE;
-
-    std::wstring url;
-    std::wstring title;
-    ui::ClipboardUtil::GetUrl(data_object, &url, &title, true);
-    OpenURLParams params(
-        GURL(url), Referrer(), CURRENT_TAB,
-        content::PAGE_TRANSITION_AUTO_BOOKMARK, false);
-    web_contents_->OpenURL(params);
-    return GetPreferredDropEffect(effect);
-  }
-
- private:
-  WebContents* web_contents_;
-
-  DISALLOW_COPY_AND_ASSIGN(InterstitialDropTarget);
-};
-
-WebDropTarget::WebDropTarget(HWND source_hwnd, WebContents* web_contents)
-    : ui::DropTarget(source_hwnd),
-      web_contents_(web_contents),
-      current_rvh_(NULL),
-      drag_cursor_(WebDragOperationNone),
-      interstitial_drop_target_(new InterstitialDropTarget(web_contents)),
-      delegate_(new WebDragBookmarkHandlerWin()) {
-}
-
-WebDropTarget::~WebDropTarget() {
-  // TODO(jam): this will be owned by chrome when it moves, so no scoped
-  // pointer.
-  if (delegate_)
-    delete delegate_;
-}
-
-DWORD WebDropTarget::OnDragEnter(IDataObject* data_object,
-                                 DWORD key_state,
-                                 POINT cursor_position,
-                                 DWORD effects) {
-  current_rvh_ = web_contents_->GetRenderViewHost();
-
-  if (delegate_)
-    delegate_->DragInitialize(web_contents_);
-
-  // Don't pass messages to the renderer if an interstitial page is showing
-  // because we don't want the interstitial page to navigate.  Instead,
-  // pass the messages on to a separate interstitial DropTarget handler.
-  if (web_contents_->ShowingInterstitialPage())
-    return interstitial_drop_target_->OnDragEnter(data_object, effects);
-
-  // 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);
-
-  if (drop_data.url.is_empty())
-    ui::OSExchangeDataProviderWin::GetPlainTextURL(data_object, &drop_data.url);
-
-  drag_cursor_ = WebDragOperationNone;
-
-  POINT client_pt = cursor_position;
-  ScreenToClient(GetHWND(), &client_pt);
-  web_contents_->GetRenderViewHost()->DragTargetDragEnter(drop_data,
-      gfx::Point(client_pt.x, client_pt.y),
-      gfx::Point(cursor_position.x, cursor_position.y),
-      web_drag_utils_win::WinDragOpMaskToWebDragOpMask(effects));
-
-  if (delegate_)
-      delegate_->OnDragEnter(data_object);
-
-  // We lie here and always return a DROPEFFECT because we don't want to
-  // wait for the IPC call to return.
-  return web_drag_utils_win::WebDragOpToWinDragOp(drag_cursor_);
-}
-
-DWORD WebDropTarget::OnDragOver(IDataObject* data_object,
-                                DWORD key_state,
-                                POINT cursor_position,
-                                DWORD effects) {
-  DCHECK(current_rvh_);
-  if (current_rvh_ != web_contents_->GetRenderViewHost())
-    OnDragEnter(data_object, key_state, cursor_position, effects);
-
-  if (web_contents_->ShowingInterstitialPage())
-    return interstitial_drop_target_->OnDragOver(data_object, effects);
-
-  POINT client_pt = cursor_position;
-  ScreenToClient(GetHWND(), &client_pt);
-  web_contents_->GetRenderViewHost()->DragTargetDragOver(
-      gfx::Point(client_pt.x, client_pt.y),
-      gfx::Point(cursor_position.x, cursor_position.y),
-      web_drag_utils_win::WinDragOpMaskToWebDragOpMask(effects));
-
-  if (delegate_)
-    delegate_->OnDragOver(data_object);
-
-  return web_drag_utils_win::WebDragOpToWinDragOp(drag_cursor_);
-}
-
-void WebDropTarget::OnDragLeave(IDataObject* data_object) {
-  DCHECK(current_rvh_);
-  if (current_rvh_ != web_contents_->GetRenderViewHost())
-    return;
-
-  if (web_contents_->ShowingInterstitialPage()) {
-    interstitial_drop_target_->OnDragLeave(data_object);
-  } else {
-    web_contents_->GetRenderViewHost()->DragTargetDragLeave();
-  }
-
-  if (delegate_)
-    delegate_->OnDragLeave(data_object);
-}
-
-DWORD WebDropTarget::OnDrop(IDataObject* data_object,
-                            DWORD key_state,
-                            POINT cursor_position,
-                            DWORD effect) {
-  DCHECK(current_rvh_);
-  if (current_rvh_ != web_contents_->GetRenderViewHost())
-    OnDragEnter(data_object, key_state, cursor_position, effect);
-
-  if (web_contents_->ShowingInterstitialPage())
-    interstitial_drop_target_->OnDragOver(data_object, effect);
-
-  if (web_contents_->ShowingInterstitialPage())
-    return interstitial_drop_target_->OnDrop(data_object, effect);
-
-  POINT client_pt = cursor_position;
-  ScreenToClient(GetHWND(), &client_pt);
-  web_contents_->GetRenderViewHost()->DragTargetDrop(
-      gfx::Point(client_pt.x, client_pt.y),
-      gfx::Point(cursor_position.x, cursor_position.y));
-
-  if (delegate_)
-    delegate_->OnDrop(data_object);
-
-  current_rvh_ = 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;
-}