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