pjs/xpfe/global/resources/content/nsTreeController.js

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JavaScript

/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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):
* Blake Ross <blaker@netscape.com> (Original Author)
*
* 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 ***** */
// helper routines, for doing rdf-based cut/copy/paste/etc
// this needs to be more generic!
const nsTransferable_contractid = "@mozilla.org/widget/transferable;1";
const clipboard_contractid = "@mozilla.org/widget/clipboard;1";
const rdf_contractid = "@mozilla.org/rdf/rdf-service;1";
const supportswstring_contractid = "@mozilla.org/supports-wstring;1";
const rdfc_contractid = "@mozilla.org/rdf/container;1";
const nsISupportsWString = Components.interfaces.nsISupportsWString;
const nsIClipboard = Components.interfaces.nsIClipboard;
const nsITransferable = Components.interfaces.nsITransferable;
const nsIRDFLiteral = Components.interfaces.nsIRDFLiteral;
const nsIRDFContainer = Components.interfaces.nsIRDFContainer;
var gRDF;
var gClipboard;
function isContainer(tree, index)
{
return tree.treeBoxObject.view.isContainer(index);
}
function isContainerOpen(tree, index)
{
return tree.treeBoxObject.view.isContainerOpen(index);
}
function nsTreeController_SetTransferData(transferable, flavor, text)
{
if (!text)
return;
var textData = Components.classes[supportswstring_contractid].createInstance(nsISupportsWString);
textData.data = text;
transferable.addDataFlavor(flavor);
transferable.setTransferData(flavor, textData, text.length*2);
}
function nsTreeController_copy()
{
var rangeCount = this.treeSelection.getRangeCount();
if (rangeCount < 1)
return false;
// Build a url that encodes all the select nodes
// as well as their parent nodes
var url = "";
var text = "";
var html = "";
var min = new Object();
var max = new Object();
for (var i = rangeCount - 1; i >= 0; --i) {
this.treeSelection.getRangeAt(i, min, max);
for (var k = max.value; k >= min.value; --k) {
// If one of the selected items is
// a container, ignore it.
if (isContainer(this.tree, k))
continue;
var pageUrl = this.treeView.getCellText(k, "URL");
var pageName = this.treeView.getCellText(k, "Name");
url += "ID:{" + pageUrl + "};";
url += "NAME:{" + pageName + "};";
text += pageUrl + "\r";
html += "<a href='" + pageUrl + "'>";
if (pageName) html += pageName;
html += "</a><p>";
}
}
if (!url)
return false;
// get some useful components
var trans = Components.classes[nsTransferable_contractid].createInstance(nsITransferable);
if (!gClipboard)
gClipboard = Components.classes[clipboard_contractid].getService(Components.interfaces.nsIClipboard);
gClipboard.emptyClipboard(nsIClipboard.kGlobalClipboard);
this.SetTransferData(trans, "text/unicode", text);
this.SetTransferData(trans, "moz/bookmarkclipboarditem", url);
this.SetTransferData(trans, "text/html", html);
gClipboard.setData(trans, null, nsIClipboard.kGlobalClipboard);
return true;
}
function nsTreeController_cut()
{
if (this.copy()) {
this.doDelete();
return true; // copy succeeded, don't care if delete failed
}
return false; // copy failed, so did cut
}
function nsTreeController_selectAll()
{
this.treeSelection.selectAll();
}
function nsTreeController_delete()
{
var rangeCount = this.treeSelection.getRangeCount();
if (rangeCount < 1)
return false;
var datasource = this.tree.database;
var dsEnum = datasource.GetDataSources();
dsEnum.getNext();
var ds = dsEnum.getNext();
var count = this.treeSelection.count;
// XXX 9 is a random number, just looking for a sweetspot
// don't want to rebuild tree content for just a few items
if (count > 9)
ds.QueryInterface(Components.interfaces.nsIBrowserHistory).startBatchUpdate();
var min = new Object();
var max = new Object();
var dirty = false;
for (var i = rangeCount - 1; i >= 0; --i) {
this.treeSelection.getRangeAt(i, min, max);
for (var k = max.value; k >= min.value; --k) {
if (!gRDF)
gRDF = Components.classes[rdf_contractid].getService(Components.interfaces.nsIRDFService);
var IDRes = this.treeBuilder.getResourceAtIndex(k);
if (!IDRes)
continue;
var root = this.tree.getAttribute('ref');
var parentIDRes;
try {
parentIDRes = this.treeBuilder.getResourceAtIndex(this.treeView.getParentIndex(k));
}
catch(ex) {
parentIDRes = gRDF.GetResource(root);
}
if (!parentIDRes)
continue;
// otherwise remove the parent/child assertion then
var containment = gRDF.GetResource("http://home.netscape.com/NC-rdf#child");
ds.QueryInterface(Components.interfaces.nsIRDFDataSource).Unassert(parentIDRes, containment, IDRes);
dirty = true;
}
}
if (dirty) {
if (count > 9) {
ds.QueryInterface(Components.interfaces.nsIBrowserHistory).endBatchUpdate();
this.tree.builder.rebuild();
}
try {
var remote = datasource.QueryInterface(Components.interfaces.nsIRDFRemoteDataSource);
remote.Flush();
} catch (ex) {
}
}
if (max.value) {
var newIndex = max.value - (max.value - min.value);
if (newIndex >= this.treeView.rowCount)
--newIndex;
this.treeSelection.select(newIndex);
}
return true;
}
function nsTreeController(tree)
{
this._tree = tree;
tree.controllers.appendController(this);
}
nsTreeController.prototype =
{
_treeSelection: null,
_treeView: null,
_treeBuilder: null,
_treeBoxObject: null,
_tree: null,
get tree()
{
return this._tree;
},
get treeBoxObject()
{
if (this._treeBoxObject)
return this._treeBoxObject;
return this._treeBoxObject = this.tree.treeBoxObject;
},
get treeView()
{
if (this._treeView)
return this._treeView;
return this._treeView = this.tree.treeBoxObject.view;
},
get treeSelection()
{
if (this._treeSelection)
return this._treeSelection;
return this._treeSelection = this.tree.treeBoxObject.view.selection;
},
get treeBuilder()
{
if (this._treeBuilder)
return this._treeBuilder;
return this._treeBuilder = this.tree.builder.
QueryInterface(Components.interfaces.nsIXULTreeBuilder);
},
SetTransferData : nsTreeController_SetTransferData,
supportsCommand: function(command)
{
switch(command)
{
case "cmd_cut":
case "cmd_copy":
case "cmd_delete":
case "cmd_selectAll":
return true;
default:
return false;
}
},
isCommandEnabled: function(command)
{
var haveCommand;
switch (command)
{
// commands which do not require selection
case "cmd_selectAll":
var treeView = this.treeView;
return (treeView.rowCount != treeView.selection.count);
// these commands require selection
case "cmd_cut":
haveCommand = (this.cut != undefined);
break;
case "cmd_copy":
haveCommand = (this.copy != undefined);
break;
case "cmd_delete":
haveCommand = (this.doDelete != undefined);
break;
}
// if we get here, then we have a command that requires selection
var haveSelection = (this.treeSelection.count);
return (haveCommand && haveSelection);
},
doCommand: function(command)
{
switch(command)
{
case "cmd_cut":
return this.cut();
case "cmd_copy":
return this.copy();
case "cmd_delete":
return this.doDelete();
case "cmd_selectAll":
return this.selectAll();
}
return false;
},
copy: nsTreeController_copy,
cut: nsTreeController_cut,
doDelete: nsTreeController_delete,
selectAll: nsTreeController_selectAll
}