/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is the Mozilla Corporation. * Portions created by the Initial Developer are Copyright (C) 2008 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Neil Deakin * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "nsDOMDragEvent.h" #include "nsIServiceManager.h" #include "nsGUIEvent.h" #include "nsContentUtils.h" #include "nsIEventStateManager.h" #include "nsDOMDataTransfer.h" #include "nsIDragService.h" nsDOMDragEvent::nsDOMDragEvent(nsPresContext* aPresContext, nsInputEvent* aEvent) : nsDOMMouseEvent(aPresContext, aEvent ? aEvent : new nsDragEvent(PR_FALSE, 0, nsnull)) { if (aEvent) { mEventIsInternal = PR_FALSE; } else { mEventIsInternal = PR_TRUE; mEvent->time = PR_Now(); mEvent->refPoint.x = mEvent->refPoint.y = 0; } } nsDOMDragEvent::~nsDOMDragEvent() { if (mEventIsInternal) { if (mEvent->eventStructType == NS_DRAG_EVENT) delete static_cast(mEvent); mEvent = nsnull; } } NS_IMPL_ADDREF_INHERITED(nsDOMDragEvent, nsDOMMouseEvent) NS_IMPL_RELEASE_INHERITED(nsDOMDragEvent, nsDOMMouseEvent) NS_INTERFACE_MAP_BEGIN(nsDOMDragEvent) NS_INTERFACE_MAP_ENTRY(nsIDOMDragEvent) NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(DragEvent) NS_INTERFACE_MAP_END_INHERITING(nsDOMMouseEvent) NS_IMETHODIMP nsDOMDragEvent::InitDragEvent(const nsAString & aType, PRBool aCanBubble, PRBool aCancelable, nsIDOMAbstractView* aView, PRInt32 aDetail, PRInt32 aScreenX, PRInt32 aScreenY, PRInt32 aClientX, PRInt32 aClientY, PRBool aCtrlKey, PRBool aAltKey, PRBool aShiftKey, PRBool aMetaKey, PRUint16 aButton, nsIDOMEventTarget *aRelatedTarget, nsIDOMDataTransfer* aDataTransfer) { nsresult rv = nsDOMMouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail, aScreenX, aScreenY, aClientX, aClientY, aCtrlKey, aAltKey, aShiftKey, aMetaKey, aButton, aRelatedTarget); NS_ENSURE_SUCCESS(rv, rv); if (mEventIsInternal && mEvent) { nsDragEvent* dragEvent = static_cast(mEvent); dragEvent->dataTransfer = aDataTransfer; } return NS_OK; } NS_IMETHODIMP nsDOMDragEvent::InitDragEventNS(const nsAString & aNamespaceURIArg, const nsAString & aType, PRBool aCanBubble, PRBool aCancelable, nsIDOMAbstractView* aView, PRInt32 aDetail, PRInt32 aScreenX, PRInt32 aScreenY, PRInt32 aClientX, PRInt32 aClientY, PRBool aCtrlKey, PRBool aAltKey, PRBool aShiftKey, PRBool aMetaKey, PRUint16 aButton, nsIDOMEventTarget *aRelatedTarget, nsIDOMDataTransfer* aDataTransfer) { return NS_ERROR_NOT_IMPLEMENTED; } NS_IMETHODIMP nsDOMDragEvent::GetDataTransfer(nsIDOMDataTransfer** aDataTransfer) { *aDataTransfer = nsnull; if (!mEvent || mEvent->eventStructType != NS_DRAG_EVENT) { NS_WARNING("Tried to get dataTransfer from non-drag event!"); return NS_OK; } // the dataTransfer field of the event caches the DataTransfer associated // with the drag. It is initialized when an attempt is made to retrieve it // rather that when the event is created to avoid duplicating the data when // no listener ever uses it. nsDragEvent* dragEvent = static_cast(mEvent); if (dragEvent->dataTransfer) { CallQueryInterface(dragEvent->dataTransfer, aDataTransfer); return NS_OK; } // for synthetic events, just use the supplied data transfer object if (mEventIsInternal) { NS_IF_ADDREF(*aDataTransfer = dragEvent->dataTransfer); return NS_OK; } // For draggesture and dragstart events, the data transfer object is // created before the event fires, so it should already be set. For other // drag events, get the object from the drag session. NS_ASSERTION(mEvent->message != NS_DRAGDROP_GESTURE && mEvent->message != NS_DRAGDROP_START, "draggesture event created without a dataTransfer"); nsCOMPtr dragSession = nsContentUtils::GetDragSession(); NS_ENSURE_TRUE(dragSession, NS_OK); // no drag in progress nsCOMPtr initialDataTransfer; dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer)); if (!initialDataTransfer) { // A dataTransfer won't exist when a drag was started by some other // means, for instance calling the drag service directly, or a drag // from another application. In either case, a new dataTransfer should // be created that reflects the data. Pass true to the constructor for // the aIsExternal argument, so that only system access is allowed. PRUint32 action = 0; dragSession->GetDragAction(&action); initialDataTransfer = new nsDOMDataTransfer(mEvent->message, action); NS_ENSURE_TRUE(initialDataTransfer, NS_ERROR_OUT_OF_MEMORY); // now set it in the drag session so we don't need to create it again dragSession->SetDataTransfer(initialDataTransfer); } // each event should use a clone of the original dataTransfer. nsCOMPtr initialDataTransferNS = do_QueryInterface(initialDataTransfer); NS_ENSURE_TRUE(initialDataTransferNS, NS_ERROR_FAILURE); initialDataTransferNS->Clone(mEvent->message, dragEvent->userCancelled, getter_AddRefs(dragEvent->dataTransfer)); NS_ENSURE_TRUE(dragEvent->dataTransfer, NS_ERROR_OUT_OF_MEMORY); // for the dragenter and dragover events, initialize the drop effect // from the drop action, which platform specific widget code sets before // the event is fired based on the keyboard state. if (mEvent->message == NS_DRAGDROP_ENTER || mEvent->message == NS_DRAGDROP_OVER) { nsCOMPtr newDataTransfer = do_QueryInterface(dragEvent->dataTransfer); NS_ENSURE_TRUE(newDataTransfer, NS_ERROR_FAILURE); PRUint32 action, effectAllowed; dragSession->GetDragAction(&action); newDataTransfer->GetEffectAllowedInt(&effectAllowed); newDataTransfer->SetDropEffectInt(FilterDropEffect(action, effectAllowed)); } else if (mEvent->message == NS_DRAGDROP_DROP || mEvent->message == NS_DRAGDROP_DRAGDROP || mEvent->message == NS_DRAGDROP_END) { // For the drop and dragend events, set the drop effect based on the // last value that the dropEffect had. This will have been set in // nsEventStateManager::PostHandleEvent for the last dragenter or // dragover event. nsCOMPtr newDataTransfer = do_QueryInterface(dragEvent->dataTransfer); NS_ENSURE_TRUE(newDataTransfer, NS_ERROR_FAILURE); PRUint32 dropEffect; initialDataTransferNS->GetDropEffectInt(&dropEffect); newDataTransfer->SetDropEffectInt(dropEffect); } NS_IF_ADDREF(*aDataTransfer = dragEvent->dataTransfer); return NS_OK; } // static PRUint32 nsDOMDragEvent::FilterDropEffect(PRUint32 aAction, PRUint32 aEffectAllowed) { // It is possible for the drag action to include more than one action, but // the widget code which sets the action from the keyboard state should only // be including one. If multiple actions were set, we just consider them in // the following order: // copy, link, move if (aAction & nsIDragService::DRAGDROP_ACTION_COPY) aAction = nsIDragService::DRAGDROP_ACTION_COPY; else if (aAction & nsIDragService::DRAGDROP_ACTION_LINK) aAction = nsIDragService::DRAGDROP_ACTION_LINK; else if (aAction & nsIDragService::DRAGDROP_ACTION_MOVE) aAction = nsIDragService::DRAGDROP_ACTION_MOVE; // Filter the action based on the effectAllowed. If the effectAllowed // doesn't include the action, then that action cannot be done, so adjust // the action to something that is allowed. For a copy, adjust to move or // link. For a move, adjust to copy or link. For a link, adjust to move or // link. Otherwise, use none. if (aAction & aEffectAllowed || aEffectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED) return aAction; if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_MOVE) return nsIDragService::DRAGDROP_ACTION_MOVE; if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_COPY) return nsIDragService::DRAGDROP_ACTION_COPY; if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_LINK) return nsIDragService::DRAGDROP_ACTION_LINK; return nsIDragService::DRAGDROP_ACTION_NONE; } nsresult NS_NewDOMDragEvent(nsIDOMEvent** aInstancePtrResult, nsPresContext* aPresContext, nsDragEvent *aEvent) { nsDOMDragEvent* event = new nsDOMDragEvent(aPresContext, aEvent); NS_ENSURE_TRUE(event, NS_ERROR_OUT_OF_MEMORY); return CallQueryInterface(event, aInstancePtrResult); }