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- /* -*- Mode: Java; tab-width: 4; 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
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Ben Goodger <ben@netscape.com> (Original Author)
- * Pierre Chanial <pierrechanial@netscape.net>
- *
- * 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 ***** */
-
- ////////////////////////////////////////////////////////////////////////////
- // XXX - WARNING - DRAG AND DROP API CHANGE ALERT - XXX
- // This file has been extensively modified in a checkin planned for Mozilla
- // 0.8, and the API has been modified. DO NOT MODIFY THIS FILE without
- // approval from ben@netscape.com, otherwise your changes will be lost.
-
- /**
- * XXX - until load is supported in chrome, you also need to include
- * these files:
- * chrome://global/content/nsTransferable.js
- **/
-
-
-
- /**
- * nsDragAndDrop - a convenience wrapper for nsTransferable, nsITransferable
- * and nsIDragService/nsIDragSession.
- *
- * Use: map the handler functions to the 'ondraggesture', 'ondragover' and
- * 'ondragdrop' event handlers on your XML element, e.g.
- * <xmlelement ondraggesture="nsDragAndDrop.startDrag(event, observer);"
- * ondragover="nsDragAndDrop.startDrag(event, observer);"
- * ondragdrop="nsDragAndDrop.drop(event, observer);"/>
- *
- * You need to create an observer js object with the following member
- * functions:
- * Object onDragStart (event) // called when drag initiated,
- * // returns flavour list with data
- * // to stuff into transferable
- * void onDragOver (Object flavour) // called when element is dragged
- * // over, so that it can perform
- * // any drag-over feedback for provided
- * // flavour
- * void onDrop (Object data) // formatted data object dropped.
- * Object getSupportedFlavours () // returns a flavour list so that
- * // nsTransferable can determine
- * // whether or not to accept drop.
- **/
-
- var nsDragAndDrop = {
-
- _mDS: null,
- get mDragService()
- {
- if (!this._mDS)
- {
- const kDSContractID = "@mozilla.org/widget/dragservice;1";
- const kDSIID = Components.interfaces.nsIDragService;
- this._mDS = Components.classes[kDSContractID].getService(kDSIID);
- }
- return this._mDS;
- },
-
- /**
- * void startDrag (DOMEvent aEvent, Object aDragDropObserver) ;
- *
- * called when a drag on an element is started.
- *
- * @param DOMEvent aEvent
- * the DOM event fired by the drag init
- * @param Object aDragDropObserver
- * javascript object of format described above that specifies
- * the way in which the element responds to drag events.
- **/
- startDrag: function (aEvent, aDragDropObserver)
- {
- if (!("onDragStart" in aDragDropObserver))
- return;
-
- const kDSIID = Components.interfaces.nsIDragService;
- var dragAction = { action: kDSIID.DRAGDROP_ACTION_COPY + kDSIID.DRAGDROP_ACTION_MOVE + kDSIID.DRAGDROP_ACTION_LINK };
-
- var transferData = { data: null };
- try
- {
- aDragDropObserver.onDragStart(aEvent, transferData, dragAction);
- }
- catch (e)
- {
- return; // not a draggable item, bail!
- }
-
- if (!transferData.data) return;
- transferData = transferData.data;
-
- var transArray = Components.classes["@mozilla.org/supports-array;1"]
- .createInstance(Components.interfaces.nsISupportsArray);
-
- var region = null;
- if (aEvent.originalTarget.localName == "treechildren") {
- // let's build the drag region
- var tree = aEvent.originalTarget.parentNode;
- try {
- region = Components.classes["@mozilla.org/gfx/region;1"].createInstance(Components.interfaces.nsIScriptableRegion);
- region.init();
- var obo = tree.treeBoxObject;
- var bo = obo.treeBody.boxObject;
- var sel= tree.view.selection;
-
- var rowX = bo.x;
- var rowY = bo.y;
- var rowHeight = obo.rowHeight;
- var rowWidth = bo.width;
-
- //add a rectangle for each visible selected row
- for (var i = obo.getFirstVisibleRow(); i <= obo.getLastVisibleRow(); i ++)
- {
- if (sel.isSelected(i))
- region.unionRect(rowX, rowY, rowWidth, rowHeight);
- rowY = rowY + rowHeight;
- }
-
- //and finally, clip the result to be sure we don't spill over...
- region.intersectRect(bo.x, bo.y, bo.width, bo.height);
- } catch(ex) {
- dump("Error while building selection region: " + ex + "\n");
- region = null;
- }
- }
-
- var count = 0;
- do
- {
- var trans = nsTransferable.set(transferData._XferID == "TransferData"
- ? transferData
- : transferData.dataList[count++]);
- transArray.AppendElement(trans.QueryInterface(Components.interfaces.nsISupports));
- }
- while (transferData._XferID == "TransferDataSet" &&
- count < transferData.dataList.length);
-
- try {
- this.mDragService.invokeDragSession(aEvent.target, transArray, region, dragAction.action);
- }
- catch(ex) {
- // this could be because the user pressed escape to
- // cancel the drag. even if it's not, there's not much
- // we can do, so be silent.
- }
- aEvent.preventBubble();
- },
-
- /**
- * void dragOver (DOMEvent aEvent, Object aDragDropObserver) ;
- *
- * called when a drag passes over this element
- *
- * @param DOMEvent aEvent
- * the DOM event fired by passing over the element
- * @param Object aDragDropObserver
- * javascript object of format described above that specifies
- * the way in which the element responds to drag events.
- **/
- dragOver: function (aEvent, aDragDropObserver)
- {
- if (!("onDragOver" in aDragDropObserver))
- return;
- if (!this.checkCanDrop(aEvent, aDragDropObserver))
- return;
- var flavourSet = aDragDropObserver.getSupportedFlavours();
- for (var flavour in flavourSet.flavourTable)
- {
- if (this.mDragSession.isDataFlavorSupported(flavour))
- {
- aDragDropObserver.onDragOver(aEvent,
- flavourSet.flavourTable[flavour],
- this.mDragSession);
- aEvent.preventBubble();
- break;
- }
- }
- },
-
- mDragSession: null,
-
- /**
- * void drop (DOMEvent aEvent, Object aDragDropObserver) ;
- *
- * called when the user drops on the element
- *
- * @param DOMEvent aEvent
- * the DOM event fired by the drop
- * @param Object aDragDropObserver
- * javascript object of format described above that specifies
- * the way in which the element responds to drag events.
- **/
- drop: function (aEvent, aDragDropObserver)
- {
- if (!("onDrop" in aDragDropObserver))
- return;
- if (!this.checkCanDrop(aEvent, aDragDropObserver))
- return;
- if (this.mDragSession.canDrop) {
- var flavourSet = aDragDropObserver.getSupportedFlavours();
- var transferData = nsTransferable.get(flavourSet, this.getDragData, true);
- // hand over to the client to respond to dropped data
- var multiple = "canHandleMultipleItems" in aDragDropObserver && aDragDropObserver.canHandleMultipleItems;
- var dropData = multiple ? transferData : transferData.first.first;
- aDragDropObserver.onDrop(aEvent, dropData, this.mDragSession);
- }
- aEvent.preventBubble();
- },
-
- /**
- * void dragExit (DOMEvent aEvent, Object aDragDropObserver) ;
- *
- * called when a drag leaves this element
- *
- * @param DOMEvent aEvent
- * the DOM event fired by leaving the element
- * @param Object aDragDropObserver
- * javascript object of format described above that specifies
- * the way in which the element responds to drag events.
- **/
- dragExit: function (aEvent, aDragDropObserver)
- {
- if (!this.checkCanDrop(aEvent, aDragDropObserver))
- return;
- if ("onDragExit" in aDragDropObserver)
- aDragDropObserver.onDragExit(aEvent, this.mDragSession);
- },
-
- /**
- * void dragEnter (DOMEvent aEvent, Object aDragDropObserver) ;
- *
- * called when a drag enters in this element
- *
- * @param DOMEvent aEvent
- * the DOM event fired by entering in the element
- * @param Object aDragDropObserver
- * javascript object of format described above that specifies
- * the way in which the element responds to drag events.
- **/
- dragEnter: function (aEvent, aDragDropObserver)
- {
- if (!this.checkCanDrop(aEvent, aDragDropObserver))
- return;
- if ("onDragEnter" in aDragDropObserver)
- aDragDropObserver.onDragEnter(aEvent, this.mDragSession);
- },
-
- /**
- * nsISupportsArray getDragData (Object aFlavourList)
- *
- * Creates a nsISupportsArray of all droppable items for the given
- * set of supported flavours.
- *
- * @param FlavourSet aFlavourSet
- * formatted flavour list.
- **/
- getDragData: function (aFlavourSet)
- {
- var supportsArray = Components.classes["@mozilla.org/supports-array;1"]
- .createInstance(Components.interfaces.nsISupportsArray);
-
- for (var i = 0; i < nsDragAndDrop.mDragSession.numDropItems; ++i)
- {
- var trans = nsTransferable.createTransferable();
- for (var j = 0; j < aFlavourSet.flavours.length; ++j)
- trans.addDataFlavor(aFlavourSet.flavours[j].contentType);
- nsDragAndDrop.mDragSession.getData(trans, i);
- supportsArray.AppendElement(trans);
- }
- return supportsArray;
- },
-
- /**
- * Boolean checkCanDrop (DOMEvent aEvent, Object aDragDropObserver) ;
- *
- * Sets the canDrop attribute for the drag session.
- * returns false if there is no current drag session.
- *
- * @param DOMEvent aEvent
- * the DOM event fired by the drop
- * @param Object aDragDropObserver
- * javascript object of format described above that specifies
- * the way in which the element responds to drag events.
- **/
- checkCanDrop: function (aEvent, aDragDropObserver)
- {
- if (!this.mDragSession)
- this.mDragSession = this.mDragService.getCurrentSession();
- if (!this.mDragSession)
- return false;
- this.mDragSession.canDrop = this.mDragSession.sourceNode != aEvent.target;
- if ("canDrop" in aDragDropObserver)
- this.mDragSession.canDrop &= aDragDropObserver.canDrop(aEvent, this.mDragSession);
- return true;
- },
-
- /**
- * Do a security check for drag n' drop. Make sure the source document
- * can load the dragged link.
- *
- * @param DOMEvent aEvent
- * the DOM event fired by leaving the element
- * @param Object aDragDropObserver
- * javascript object of format described above that specifies
- * the way in which the element responds to drag events.
- * @param String aUri
- * the uri being dragged
- **/
- dragDropSecurityCheck: function (aEvent, aDragSession, aUri)
- {
- var sourceDoc = aDragSession.sourceDocument;
-
- if (sourceDoc) {
- // Strip leading and trailing whitespace, then try to create a
- // URI from the dropped string. If that succeeds, we're
- // dropping a URI and we need to do a security check to make
- // sure the source document can load the dropped URI. We don't
- // so much care about creating the real URI here
- // (i.e. encoding differences etc don't matter), we just want
- // to know if aUri really is a URI.
-
- var uriStr = aUri.replace(/^\s*|\s*$/g, '');
- var uri = null;
-
- try {
- uri = Components.classes["@mozilla.org/network/io-service;1"]
- .getService(Components.interfaces.nsIIOService)
- .newURI(uriStr, null, null);
- } catch (e) {
- }
-
- if (uri) {
- // aUri is a URI, do the security check.
- var sourceURI = sourceDoc.documentURI;
-
- const nsIScriptSecurityManager =
- Components.interfaces.nsIScriptSecurityManager;
- var secMan =
- Components.classes["@mozilla.org/scriptsecuritymanager;1"]
- .getService(nsIScriptSecurityManager);
-
- try {
- secMan.checkLoadURIStr(sourceURI, uriStr,
- nsIScriptSecurityManager.STANDARD);
- } catch (e) {
- // Stop event propagation right here.
- aEvent.stopPropagation();
-
- throw "Drop of " + aUri + " denied.";
- }
- }
- }
- }
- };
-