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371 lines
11 KiB
C#
371 lines
11 KiB
C#
/* -*- Mode: C#; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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 Manticore.
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*
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* The Initial Developer of the Original Code is
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* Silverstone Interactive.
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* Portions created by the Initial Developer are Copyright (C) 2001
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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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*
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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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namespace Silverstone.Manticore.Toolkit
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{
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using System;
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using System.Windows.Forms;
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using System.Collections;
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using Silverstone.Manticore.Core;
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public abstract class DynamicTreeBuilder : ContentBuilder, IDataStoreObserver
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{
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/// <summary>
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/// The |TreeNode| that is the parent of the content builder
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/// </summary>
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protected TreeNode mParent = null;
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protected TreeNodeCollection mParentNodes = null;
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/// <summary>
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/// |mBefore| and |mAfter| define the static boundaries within which
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/// the DynamicTreeBuilder operates. Used if the builder builds items
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/// which are siblings to static |TreeNode|s.
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/// </summary>
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protected TreeNode mBefore = null;
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protected TreeNode mAfter = null;
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/// <summary>
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/// The containing |TreeView|
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/// </summary>
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protected ManticoreTreeView mTreeView = null;
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/// <summary>
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/// All of this builder's |TreeNode|s, keyed by DataStore id.
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/// </summary>
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protected Hashtable mNodes = null;
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/// <summary>
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/// This is the default point of insertion of new nodes. Initially, this
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/// is the index of |mBefore|, or 0 if |mBefore| is null. As items are added,
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/// it is incremented.
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/// </summary>
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protected int mInsertionPoint = 0;
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public DynamicTreeBuilder(ManticoreTreeView aTreeView, TreeNode aParent)
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{
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if (aTreeView == null)
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throw new Exception();
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if (aParent != null)
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{
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mParent = aParent;
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mParentNodes = aParent.Nodes;
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}
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else
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mParentNodes = aTreeView.Nodes;
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mTreeView = aTreeView;
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InitializeComponent();
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}
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public DynamicTreeBuilder(ManticoreTreeView aTreeView, TreeNode aParent, TreeNode aBefore, TreeNode aAfter)
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{
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mParent = aParent;
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mTreeView = aTreeView;
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// XXX we do jack shit to handle this at the moment. TBD.
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mBefore = aBefore;
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mAfter = aAfter;
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ResetInsertionPoint();
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InitializeComponent();
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}
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private void ResetInsertionPoint()
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{
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if (mBefore != null)
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{
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// The insertion point is the position immediately after |mBefore|
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mInsertionPoint = mParentNodes.IndexOf(mBefore) + 1;
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}
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else
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mInsertionPoint = 0;
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}
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protected virtual void InitializeComponent()
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{
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mNodes = new Hashtable();
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// XXX for now, just be stupid and generate everything when the root
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// menu is opened.
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mTreeView.BeforeExpand += new TreeViewCancelEventHandler(OnBeforeExpand);
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}
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/// <summary>
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/// Overridden by clients to provide command handling for built menus.
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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protected virtual void OnBeforeExpand(Object sender, TreeViewCancelEventArgs e)
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{
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// XXX make this smarter.
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Build();
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}
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///////////////////////////////////////////////////////////////////////////
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// ContentBuilder Implementation
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public void OnNodeChanging(Object aOldNode, Object aNewNode)
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{
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// Not Implemented.
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}
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public void OnNodeChanged(Object aOldNode, Object aNewNode)
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{
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// Enumerate each of the properties that affect FE presentation, test
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// for difference, and update the FE if necessary.
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CommandTarget oldTarget = aOldNode as CommandTarget;
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CommandTarget newTarget = aNewNode as CommandTarget;
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if (oldTarget == null && newTarget == null)
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return;
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int itemKey = newTarget.Data.GetHashCode();
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if (mNodes.ContainsKey(itemKey))
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{
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ManticoreTreeNode item = mNodes[itemKey] as ManticoreTreeNode;
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// Check for Label/AccessKey change.
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if (newTarget.Label != oldTarget.Label)
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item.Text = newTarget.Label;
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if (newTarget.IsContainer)
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item.ImageIndex = mTreeView.GetIconIndex(newTarget);
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}
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}
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public void OnNodeAdding(Object aNewNode, Object aParentNode, int aIndex)
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{
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// Not Implemented.
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}
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public void OnNodeAdded(Object aChildNode, Object aParentNode, int aIndex)
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{
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// A new Element has been added somewhere. We must find the
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// parent menu and append it. To interoperate with the Content Builder,
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// the DataStore must provide |CommandTarget|s to this method.
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CommandTarget childTarget = aChildNode as CommandTarget;
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CommandTarget parentTarget = aParentNode as CommandTarget;
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if (childTarget == null && parentTarget == null)
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return;
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// Determine based on conditions defined by the |TreeView|
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// whether or not this node should be built.
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if (!mTreeView.ShouldBuild(childTarget))
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return;
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int childKey = childTarget.Data.GetHashCode();
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if (!mNodes.ContainsKey(childKey))
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{
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int parentKey = parentTarget.Data.GetHashCode();
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ManticoreTreeNode parentNode;
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if (mNodes.ContainsKey(parentKey))
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parentNode = mNodes[parentKey] as ManticoreTreeNode;
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else
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parentNode = mParent as ManticoreTreeNode;
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if (parentNode != null)
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{
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ManticoreTreeNode childNode = new ManticoreTreeNode(childTarget.Label,
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childTarget.Data);
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if (parentNode != null)
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{
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int imageIndex = mTreeView.GetIconIndex(childTarget);
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if (imageIndex > -1)
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childNode.ImageIndex = imageIndex;
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parentNode.Nodes.Insert(aIndex, childNode);
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if (childTarget.IsContainer && childTarget.IsOpen)
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childNode.Expand();
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mNodes.Add(childKey, childNode);
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}
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}
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}
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}
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public void OnNodeRemoving(Object aNodeRemoving)
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{
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// Not Implemented.
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}
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public void OnNodeRemoved(Object aNodeRemoved)
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{
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CommandTarget childTarget = aNodeRemoved as CommandTarget;
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// Remove |MenuItem| representation of |aChildNode|.
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int childKey = childTarget.Data.GetHashCode();
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if (mNodes.ContainsKey(childKey))
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{
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ManticoreTreeNode childNode = mNodes[childKey] as ManticoreTreeNode;
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ManticoreTreeNode parentNode = childNode.Parent as ManticoreTreeNode;
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if (parentNode != null)
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parentNode.Nodes.Remove(childNode);
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else
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mTreeView.Nodes.Remove(childNode);
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mNodes.Remove(childKey);
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}
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}
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/// <summary>
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/// Build content. Builds all content if |LazyState| is set to false.
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/// </summary>
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public override void Build()
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{
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if (mDataStore == null || mRoot == null)
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throw new Exception();
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// XXX implement acknowledgement of |LazyState|
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Recurse(mRoot, mParentNodes);
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}
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public void Recurse(String aRoot, TreeNodeCollection aNodes)
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{
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IEnumerator items;
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mDataStore.GetElements(aRoot, out items);
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items.Reset();
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ManticoreTreeNode node;
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while (items.MoveNext())
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{
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// |id| is the item's unique identifier within the DataStore.
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// The handling code can use this to probe for more information
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// about the selected item.
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CommandTarget current = items.Current as CommandTarget;
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if (current != null)
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{
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// Determine based on conditions defined by the |TreeView|
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// whether or not this node should be built.
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if (!mTreeView.ShouldBuild(current))
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continue;
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String id = current.Data as String;
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int idKey = id.GetHashCode();
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if (!mNodes.ContainsKey(idKey))
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{
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node = new ManticoreTreeNode(current.Label, id);
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int imageIndex = mTreeView.GetIconIndex(current);
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if (imageIndex > -1)
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node.ImageIndex = imageIndex;
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aNodes.Insert(mInsertionPoint++, node);
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if (current.IsContainer && current.IsOpen)
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node.Expand();
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mNodes.Add(id.GetHashCode(), node);
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// If we're a container, recurse
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if (current.IsContainer)
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Recurse(id, node.Nodes);
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}
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}
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}
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ResetInsertionPoint();
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}
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///////////////////////////////////////////////////////////////////////////
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//
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public TreeNode Parent
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{
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get
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{
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return mParent;
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}
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set
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{
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mParent = value;
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}
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}
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public TreeNode Before
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{
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get
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{
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return mBefore;
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}
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set
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{
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mBefore = value;
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}
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}
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public TreeNode After
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{
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get
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{
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return mAfter;
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}
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set
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{
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mAfter = value;
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}
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}
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}
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public class BaseTreeBuilder : DynamicTreeBuilder
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{
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public BaseTreeBuilder(ManticoreTreeView aTreeView, TreeNode aParent) : base(aTreeView, aParent)
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{
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InitializeComponent();
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}
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public BaseTreeBuilder(ManticoreTreeView aTreeView,
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TreeNode aParent,
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TreeNode aBefore,
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TreeNode aAfter) : base(aTreeView, aParent, aBefore, aAfter)
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{
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InitializeComponent();
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}
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protected override void InitializeComponent()
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{
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base.InitializeComponent();
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mDataStore = new SampleDataStore();
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mDataStore.AddObserver(this as IDataStoreObserver);
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}
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}
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}
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