190 lines
5.2 KiB
C++
190 lines
5.2 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 License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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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 "nsWidgetsCID.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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NS_IMPL_ADDREF(nsBaseDragService)
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NS_IMPL_RELEASE(nsBaseDragService)
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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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mTargetSize(0,0), mCanDrop(PR_FALSE), mDragAction(DRAGDROP_ACTION_NONE),
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mDoingDrag(PR_FALSE)
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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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* @param aIID The name of the class implementing the method
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* @param _classiiddef The name of the #define symbol that defines the IID
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* for the class (e.g. NS_ISUPPORTS_IID)
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*
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*/
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nsresult nsBaseDragService::QueryInterface(const nsIID& aIID, void** aInstancePtr)
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{
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if (NULL == aInstancePtr)
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return NS_ERROR_NULL_POINTER;
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nsresult rv = NS_NOINTERFACE;
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if ( aIID.Equals(nsIDragService::GetIID()) ) {
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*aInstancePtr = NS_STATIC_CAST(nsIDragService*,this);
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NS_ADDREF_THIS();
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return NS_OK;
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}
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else if (aIID.Equals(nsIDragSession::GetIID())) {
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*aInstancePtr = NS_STATIC_CAST(nsIDragSession*,this);
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NS_ADDREF_THIS();
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return NS_OK;
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}
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return rv;
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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::GetData (nsITransferable * aTransferable)
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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(nsIDataFlavor * aDataFlavor)
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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 (nsISupportsArray * anArrayTransferables, nsIRegion * aRegion, PRUint32 aActionType)
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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::InvokeDragSessionSingle (nsITransferable * aTransferable, nsIRegion * aRegion, PRUint32 aActionType)
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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::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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NS_ADDREF_THIS(); // addRef because we're a "getter"
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*aSession = this;
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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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return NS_OK;
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}
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