forked from mirrors/gecko-dev
649 lines
23 KiB
JavaScript
649 lines
23 KiB
JavaScript
# -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# 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
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# Netscape Communications Corporation.
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# Portions created by the Initial Developer are Copyright (C) 1998
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Ben Goodger <ben@netscape.com> (Original Author)
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# Pierre Chanial <pierrechanial@netscape.net>
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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/**
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* nsTransferable - a wrapper for nsITransferable that simplifies
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* javascript clipboard and drag&drop. for use in
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* these situations you should use the nsClipboard
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* and nsDragAndDrop wrappers for more convenience
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**/
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var nsTransferable = {
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/**
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* nsITransferable set (TransferData aTransferData) ;
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*
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* Creates a transferable with data for a list of supported types ("flavours")
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*
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* @param TransferData aTransferData
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* a javascript object in the format described above
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**/
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set: function (aTransferDataSet)
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{
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var trans = this.createTransferable();
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for (var i = 0; i < aTransferDataSet.dataList.length; ++i)
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{
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var currData = aTransferDataSet.dataList[i];
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var currFlavour = currData.flavour.contentType;
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trans.addDataFlavor(currFlavour);
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var supports = null; // nsISupports data
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var length = 0;
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if (currData.flavour.dataIIDKey == "nsISupportsString")
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{
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supports = Components.classes["@mozilla.org/supports-string;1"]
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.createInstance(Components.interfaces.nsISupportsString);
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supports.data = currData.supports;
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length = supports.data.length;
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}
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else
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{
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// non-string data.
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supports = currData.supports;
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length = 0; // kFlavorHasDataProvider
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}
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trans.setTransferData(currFlavour, supports, length * 2);
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}
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return trans;
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},
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/**
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* TransferData/TransferDataSet get (FlavourSet aFlavourSet,
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* Function aRetrievalFunc, Boolean aAnyFlag) ;
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*
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* Retrieves data from the transferable provided in aRetrievalFunc, formatted
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* for more convenient access.
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*
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* @param FlavourSet aFlavourSet
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* a FlavourSet object that contains a list of supported flavours.
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* @param Function aRetrievalFunc
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* a reference to a function that returns a nsISupportsArray of nsITransferables
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* for each item from the specified source (clipboard/drag&drop etc)
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* @param Boolean aAnyFlag
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* a flag specifying whether or not a specific flavour is requested. If false,
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* data of the type of the first flavour in the flavourlist parameter is returned,
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* otherwise the best flavour supported will be returned.
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**/
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get: function (aFlavourSet, aRetrievalFunc, aAnyFlag)
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{
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if (!aRetrievalFunc)
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throw "No data retrieval handler provided!";
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var supportsArray = aRetrievalFunc(aFlavourSet);
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var dataArray = [];
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var count = supportsArray.Count();
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// Iterate over the number of items returned from aRetrievalFunc. For
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// clipboard operations, this is 1, for drag and drop (where multiple
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// items may have been dragged) this could be >1.
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for (var i = 0; i < count; i++)
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{
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var trans = supportsArray.GetElementAt(i);
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if (!trans) continue;
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trans = trans.QueryInterface(Components.interfaces.nsITransferable);
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var data = { };
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var length = { };
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var currData = null;
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if (aAnyFlag)
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{
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var flavour = { };
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trans.getAnyTransferData(flavour, data, length);
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if (data && flavour)
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{
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var selectedFlavour = aFlavourSet.flavourTable[flavour.value];
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if (selectedFlavour)
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dataArray[i] = FlavourToXfer(data.value, length.value, selectedFlavour);
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}
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}
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else
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{
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var firstFlavour = aFlavourSet.flavours[0];
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trans.getTransferData(firstFlavour, data, length);
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if (data && firstFlavour)
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dataArray[i] = FlavourToXfer(data.value, length.value, firstFlavour);
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}
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}
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return new TransferDataSet(dataArray);
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},
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/**
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* nsITransferable createTransferable (void) ;
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*
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* Creates and returns a transferable object.
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**/
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createTransferable: function ()
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{
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const kXferableContractID = "@mozilla.org/widget/transferable;1";
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const kXferableIID = Components.interfaces.nsITransferable;
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return Components.classes[kXferableContractID].createInstance(kXferableIID);
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}
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};
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/**
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* A FlavourSet is a simple type that represents a collection of Flavour objects.
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* FlavourSet is constructed from an array of Flavours, and stores this list as
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* an array and a hashtable. The rationale for the dual storage is as follows:
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*
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* Array: Ordering is important when adding data flavours to a transferable.
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* Flavours added first are deemed to be 'preferred' by the client.
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* Hash: Convenient lookup of flavour data using the content type (MIME type)
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* of data as a key.
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*/
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function FlavourSet(aFlavourList)
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{
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this.flavours = aFlavourList || [];
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this.flavourTable = { };
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this._XferID = "FlavourSet";
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for (var i = 0; i < this.flavours.length; ++i)
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this.flavourTable[this.flavours[i].contentType] = this.flavours[i];
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}
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FlavourSet.prototype = {
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appendFlavour: function (aFlavour, aFlavourIIDKey)
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{
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var flavour = new Flavour (aFlavour, aFlavourIIDKey);
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this.flavours.push(flavour);
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this.flavourTable[flavour.contentType] = flavour;
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}
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};
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/**
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* A Flavour is a simple type that represents a data type that can be handled.
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* It takes a content type (MIME type) which is used when storing data on the
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* system clipboard/drag and drop, and an IIDKey (string interface name
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* which is used to QI data to an appropriate form. The default interface is
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* assumed to be wide-string.
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*/
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function Flavour(aContentType, aDataIIDKey)
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{
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this.contentType = aContentType;
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this.dataIIDKey = aDataIIDKey || "nsISupportsString";
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this._XferID = "Flavour";
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}
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function TransferDataBase() {}
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TransferDataBase.prototype = {
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push: function (aItems)
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{
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this.dataList.push(aItems);
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},
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get first ()
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{
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return "dataList" in this && this.dataList.length ? this.dataList[0] : null;
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}
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};
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/**
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* TransferDataSet is a list (array) of TransferData objects, which represents
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* data dragged from one or more elements.
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*/
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function TransferDataSet(aTransferDataList)
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{
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this.dataList = aTransferDataList || [];
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this._XferID = "TransferDataSet";
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}
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TransferDataSet.prototype = TransferDataBase.prototype;
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/**
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* TransferData is a list (array) of FlavourData for all the applicable content
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* types associated with a drag from a single item.
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*/
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function TransferData(aFlavourDataList)
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{
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this.dataList = aFlavourDataList || [];
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this._XferID = "TransferData";
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}
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TransferData.prototype = {
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__proto__: TransferDataBase.prototype,
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addDataForFlavour: function (aFlavourString, aData, aLength, aDataIIDKey)
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{
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this.dataList.push(new FlavourData(aData, aLength,
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new Flavour(aFlavourString, aDataIIDKey)));
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}
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};
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/**
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* FlavourData is a type that represents data retrieved from the system
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* clipboard or drag and drop. It is constructed internally by the Transferable
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* using the raw (nsISupports) data from the clipboard, the length of the data,
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* and an object of type Flavour representing the type. Clients implementing
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* IDragDropObserver receive an object of this type in their implementation of
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* onDrop. They access the 'data' property to retrieve data, which is either data
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* QI'ed to a usable form, or unicode string.
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*/
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function FlavourData(aData, aLength, aFlavour)
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{
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this.supports = aData;
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this.contentLength = aLength;
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this.flavour = aFlavour || null;
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this._XferID = "FlavourData";
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}
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FlavourData.prototype = {
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get data ()
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{
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if (this.flavour &&
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this.flavour.dataIIDKey != "nsISupportsString" )
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return this.supports.QueryInterface(Components.interfaces[this.flavour.dataIIDKey]);
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else {
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var unicode = this.supports.QueryInterface(Components.interfaces.nsISupportsString);
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if (unicode)
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return unicode.data.substring(0, this.contentLength/2);
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return this.supports;
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}
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return "";
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}
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}
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/**
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* Create a TransferData object with a single FlavourData entry. Used when
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* unwrapping data of a specific flavour from the drag service.
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*/
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function FlavourToXfer(aData, aLength, aFlavour)
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{
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return new TransferData([new FlavourData(aData, aLength, aFlavour)]);
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}
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var transferUtils = {
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retrieveURLFromData: function (aData, flavour)
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{
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switch (flavour) {
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case "text/unicode":
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return aData.replace(/^\s+|\s+$/g, "");
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case "text/x-moz-url":
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return aData.toString().split("\n")[0];
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case "application/x-moz-file":
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var ioService = Components.classes["@mozilla.org/network/io-service;1"]
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.getService(Components.interfaces.nsIIOService);
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var fileHandler = ioService.getProtocolHandler("file")
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.QueryInterface(Components.interfaces.nsIFileProtocolHandler);
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return fileHandler.getURLSpecFromFile(aData);
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}
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return null;
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}
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}
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/**
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* nsDragAndDrop - a convenience wrapper for nsTransferable, nsITransferable
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* and nsIDragService/nsIDragSession.
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*
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* Use: map the handler functions to the 'ondraggesture', 'ondragover' and
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* 'ondragdrop' event handlers on your XML element, e.g.
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* <xmlelement ondraggesture="nsDragAndDrop.startDrag(event, observer);"
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* ondragover="nsDragAndDrop.dragOver(event, observer);"
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* ondragdrop="nsDragAndDrop.drop(event, observer);"/>
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*
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* You need to create an observer js object with the following member
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* functions:
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* Object onDragStart (event) // called when drag initiated,
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* // returns flavour list with data
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* // to stuff into transferable
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* void onDragOver (Object flavour) // called when element is dragged
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* // over, so that it can perform
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* // any drag-over feedback for provided
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* // flavour
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* void onDrop (Object data) // formatted data object dropped.
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* Object getSupportedFlavours () // returns a flavour list so that
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* // nsTransferable can determine
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* // whether or not to accept drop.
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**/
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var nsDragAndDrop = {
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_mDS: null,
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get mDragService()
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{
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if (!this._mDS)
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{
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const kDSContractID = "@mozilla.org/widget/dragservice;1";
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const kDSIID = Components.interfaces.nsIDragService;
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this._mDS = Components.classes[kDSContractID].getService(kDSIID);
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}
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return this._mDS;
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},
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/**
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* void startDrag (DOMEvent aEvent, Object aDragDropObserver) ;
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*
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* called when a drag on an element is started.
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*
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* @param DOMEvent aEvent
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* the DOM event fired by the drag init
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* @param Object aDragDropObserver
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* javascript object of format described above that specifies
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* the way in which the element responds to drag events.
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**/
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startDrag: function (aEvent, aDragDropObserver)
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{
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if (!("onDragStart" in aDragDropObserver))
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return;
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const kDSIID = Components.interfaces.nsIDragService;
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var dragAction = { action: kDSIID.DRAGDROP_ACTION_COPY + kDSIID.DRAGDROP_ACTION_MOVE + kDSIID.DRAGDROP_ACTION_LINK };
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var transferData = { data: null };
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try
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{
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aDragDropObserver.onDragStart(aEvent, transferData, dragAction);
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}
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catch (e)
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{
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return; // not a draggable item, bail!
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}
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if (!transferData.data) return;
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transferData = transferData.data;
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var transArray = Components.classes["@mozilla.org/supports-array;1"]
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.createInstance(Components.interfaces.nsISupportsArray);
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var region = null;
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if (aEvent.originalTarget.localName == "treechildren") {
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// let's build the drag region
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var tree = aEvent.originalTarget.parentNode;
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try {
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region = Components.classes["@mozilla.org/gfx/region;1"].createInstance(Components.interfaces.nsIScriptableRegion);
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region.init();
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var obo = tree.treeBoxObject;
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var bo = obo.treeBody.boxObject;
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var sel= obo.view.selection;
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var rowX = bo.x;
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var rowY = bo.y;
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var rowHeight = obo.rowHeight;
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var rowWidth = bo.width;
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//add a rectangle for each visible selected row
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for (var i = obo.getFirstVisibleRow(); i <= obo.getLastVisibleRow(); i ++)
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{
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if (sel.isSelected(i))
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region.unionRect(rowX, rowY, rowWidth, rowHeight);
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rowY = rowY + rowHeight;
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}
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//and finally, clip the result to be sure we don't spill over...
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region.intersectRect(bo.x, bo.y, bo.width, bo.height);
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} catch(ex) {
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dump("Error while building selection region: " + ex + "\n");
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region = null;
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}
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}
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var count = 0;
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do
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{
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var trans = nsTransferable.set(transferData._XferID == "TransferData"
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? transferData
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: transferData.dataList[count++]);
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transArray.AppendElement(trans.QueryInterface(Components.interfaces.nsISupports));
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}
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while (transferData._XferID == "TransferDataSet" &&
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count < transferData.dataList.length);
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try {
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this.mDragService.invokeDragSessionWithImage(aEvent.target, transArray,
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region, dragAction.action,
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null, 0, 0, aEvent);
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}
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catch(ex) {
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// this could be because the user pressed escape to
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// cancel the drag. even if it's not, there's not much
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// we can do, so be silent.
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}
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aEvent.stopPropagation();
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},
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/**
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* void dragOver (DOMEvent aEvent, Object aDragDropObserver) ;
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*
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* called when a drag passes over this element
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*
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* @param DOMEvent aEvent
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* the DOM event fired by passing over the element
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* @param Object aDragDropObserver
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* javascript object of format described above that specifies
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* the way in which the element responds to drag events.
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**/
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dragOver: function (aEvent, aDragDropObserver)
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{
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if (!("onDragOver" in aDragDropObserver))
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return;
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if (!this.checkCanDrop(aEvent, aDragDropObserver))
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return;
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var flavourSet = aDragDropObserver.getSupportedFlavours();
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for (var flavour in flavourSet.flavourTable)
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{
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if (this.mDragSession.isDataFlavorSupported(flavour))
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{
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aDragDropObserver.onDragOver(aEvent,
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flavourSet.flavourTable[flavour],
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this.mDragSession);
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aEvent.stopPropagation();
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break;
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}
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}
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},
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mDragSession: null,
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/**
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* void drop (DOMEvent aEvent, Object aDragDropObserver) ;
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*
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* called when the user drops on the element
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*
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* @param DOMEvent aEvent
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* the DOM event fired by the drop
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* @param Object aDragDropObserver
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* javascript object of format described above that specifies
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* the way in which the element responds to drag events.
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**/
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drop: function (aEvent, aDragDropObserver)
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{
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if (!("onDrop" in aDragDropObserver))
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return;
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if (!this.checkCanDrop(aEvent, aDragDropObserver))
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return;
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if (this.mDragSession.canDrop) {
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var flavourSet = aDragDropObserver.getSupportedFlavours();
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var transferData = nsTransferable.get(flavourSet, this.getDragData, true);
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// hand over to the client to respond to dropped data
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var multiple = "canHandleMultipleItems" in aDragDropObserver && aDragDropObserver.canHandleMultipleItems;
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var dropData = multiple ? transferData : transferData.first.first;
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aDragDropObserver.onDrop(aEvent, dropData, this.mDragSession);
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}
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aEvent.stopPropagation();
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},
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/**
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* void dragExit (DOMEvent aEvent, Object aDragDropObserver) ;
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*
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* 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 aDraggedText
|
|
* the text being dragged
|
|
**/
|
|
dragDropSecurityCheck: function (aEvent, aDragSession, aDraggedText)
|
|
{
|
|
var sourceDoc = aDragSession.sourceDocument;
|
|
if (!sourceDoc)
|
|
return;
|
|
|
|
// 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 aDraggedText really is a URI.
|
|
|
|
aDraggedText = aDraggedText.replace(/^\s*|\s*$/g, '');
|
|
|
|
var uri;
|
|
|
|
try {
|
|
uri = Components.classes["@mozilla.org/network/io-service;1"]
|
|
.getService(Components.interfaces.nsIIOService)
|
|
.newURI(aDraggedText, null, null);
|
|
} catch (e) {
|
|
}
|
|
|
|
if (!uri)
|
|
return;
|
|
|
|
// aDraggedText is a URI, do the security check.
|
|
const nsIScriptSecurityManager = Components.interfaces
|
|
.nsIScriptSecurityManager;
|
|
var secMan = Components.classes["@mozilla.org/scriptsecuritymanager;1"]
|
|
.getService(nsIScriptSecurityManager);
|
|
|
|
try {
|
|
secMan.checkLoadURIStr(sourceDoc.documentURI, aDraggedText,
|
|
nsIScriptSecurityManager.STANDARD);
|
|
} catch (e) {
|
|
// Stop event propagation right here.
|
|
aEvent.stopPropagation();
|
|
|
|
throw "Drop of " + aDraggedText + " denied.";
|
|
}
|
|
}
|
|
};
|
|
|