/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: NPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Netscape 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/NPL/ * * 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 * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either 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 NPL, 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 NPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "nsBaseDragService.h" #include "nsITransferable.h" #include "nsIServiceManager.h" #include "nsITransferable.h" #include "nsISupportsArray.h" #include "nsSize.h" #include "nsIRegion.h" #include "nsISupportsPrimitives.h" #include "nsCOMPtr.h" #include "nsIFrame.h" #include "nsIDocument.h" #include "nsIContent.h" #include "nsIPresShell.h" #include "nsIDOMNode.h" #include "nsIPresContext.h" NS_IMPL_ADDREF(nsBaseDragService) NS_IMPL_RELEASE(nsBaseDragService) NS_IMPL_QUERY_INTERFACE2(nsBaseDragService, nsIDragService, nsIDragSession) //------------------------------------------------------------------------- // // DragService constructor // //------------------------------------------------------------------------- nsBaseDragService::nsBaseDragService() : mCanDrop(PR_FALSE), mDoingDrag(PR_FALSE), mTargetSize(0,0), mDragAction(DRAGDROP_ACTION_NONE) { NS_INIT_REFCNT(); nsresult result = NS_NewISupportsArray(getter_AddRefs(mTransArray)); if ( NS_FAILED(result) ) { //what do we do? we can't throw! ; } } //------------------------------------------------------------------------- // // DragService destructor // //------------------------------------------------------------------------- nsBaseDragService::~nsBaseDragService() { } //--------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::SetCanDrop (PRBool aCanDrop) { mCanDrop = aCanDrop; return NS_OK; } //--------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::GetCanDrop (PRBool * aCanDrop) { *aCanDrop = mCanDrop; return NS_OK; } //--------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::SetDragAction (PRUint32 anAction) { mDragAction = anAction; return NS_OK; } //--------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::GetDragAction (PRUint32 * anAction) { *anAction = mDragAction; return NS_OK; } //--------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::SetTargetSize (nsSize aDragTargetSize) { mTargetSize = aDragTargetSize; return NS_OK; } //--------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::GetTargetSize (nsSize * aDragTargetSize) { *aDragTargetSize = mTargetSize; return NS_OK; } //------------------------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::GetNumDropItems (PRUint32 * aNumItems) { *aNumItems = 0; return NS_ERROR_FAILURE; } // // GetSourceDocument // // Returns the DOM document where the drag was initiated. This will be // nsnull if the drag began outside of our application. // NS_IMETHODIMP nsBaseDragService :: GetSourceDocument ( nsIDOMDocument** aSourceDocument ) { *aSourceDocument = mSourceDocument.get(); NS_IF_ADDREF ( *aSourceDocument ); return NS_OK; } // // GetSourceNode // // Returns the DOM node where the drag was initiated. This will be // nsnull if the drag began outside of our application. // NS_IMETHODIMP nsBaseDragService :: GetSourceNode ( nsIDOMNode** aSourceNode ) { *aSourceNode = mSourceNode.get(); NS_IF_ADDREF ( *aSourceNode ); return NS_OK; } //------------------------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::GetData (nsITransferable * aTransferable, PRUint32 aItemIndex) { return NS_ERROR_FAILURE; } //------------------------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::IsDataFlavorSupported(const char *aDataFlavor, PRBool *_retval) { return NS_ERROR_FAILURE; } //------------------------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::InvokeDragSession (nsIDOMNode *aDOMNode, nsISupportsArray * anArrayTransferables, nsIScriptableRegion * aRegion, PRUint32 aActionType) { NS_WARN_IF_FALSE ( aDOMNode, "No node provided to InvokeDragSession, you should provide one" ); if ( aDOMNode ) { // stash the document of the dom node aDOMNode->GetOwnerDocument ( getter_AddRefs(mSourceDocument) ); mSourceNode = aDOMNode; // When the mouse goes down, the selection code starts a mouse capture. However, // this gets in the way of determining drag feedback for things like trees because // the event coordinates are in the wrong coord system. Turn off capture by // getting the frame associated with the DOM Node. nsIFrame* dragFrame = nsnull; nsCOMPtr context; GetFrameFromNode ( aDOMNode, &dragFrame, getter_AddRefs(context) ); if ( dragFrame && context ) dragFrame->CaptureMouse ( context, PR_FALSE ); } return NS_OK; } //------------------------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::GetCurrentSession (nsIDragSession ** aSession) { if ( !aSession ) return NS_ERROR_INVALID_ARG; // "this" also implements a drag session, so say we are one but only if there // is currently a drag going on. if ( mDoingDrag ) { *aSession = this; NS_ADDREF(*aSession); // addRef because we're a "getter" } else *aSession = nsnull; return NS_OK; } //------------------------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::StartDragSession () { if (mDoingDrag) { return NS_ERROR_FAILURE; } mDoingDrag = PR_TRUE; return NS_OK; } //------------------------------------------------------------------------- NS_IMETHODIMP nsBaseDragService::EndDragSession () { if (!mDoingDrag) { return NS_ERROR_FAILURE; } mDoingDrag = PR_FALSE; mSourceDocument = nsnull; // release the source document we've been holding return NS_OK; } // // GetFrameFromNode // // Get the frame for this content node (note: frames are not refcounted). // void nsBaseDragService :: GetFrameFromNode ( nsIDOMNode* inNode, nsIFrame** outFrame, nsIPresContext** outContext ) { *outFrame = nsnull; *outContext = nsnull; if ( !inNode || !outContext ) return; nsCOMPtr doc; nsCOMPtr contentNode = do_QueryInterface(inNode); if (contentNode) { contentNode->GetDocument(*getter_AddRefs(doc)); if (doc) { nsCOMPtr presShell; doc->GetShellAt(0, getter_AddRefs(presShell)); if (presShell) { presShell->GetPresContext(outContext); presShell->GetPrimaryFrameFor(contentNode, outFrame); NS_ASSERTION ( *outFrame, "Can't get frame for this dom node" ); } } } } // GetFrameFromNode