TreeNode.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » UI » WebControls » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Web 
System.Web » System » Web » UI » WebControls » TreeNode.cs
//
// System.Web.UI.WebControls.TreeNode.cs
//
// Authors:
//  Lluis Sanchez Gual (lluis@novell.com)
//
// (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//

#if NET_2_0

using System;
using System.Collections;
using System.Text;
using System.ComponentModel;
using System.Web.UI;

namespace System.Web.UI.WebControls{
  [ParseChildrenAttribute (true, "ChildNodes")]
  public class TreeNode: IStateManager, ICloneable
  {
    StateBag ViewState = new StateBag ();
    TreeNodeCollection nodes;
    bool marked;
    TreeView tree;
    TreeNode parent;
    int index;
    string path;
    int depth = -1;
    
    object dataItem;
    IHierarchyData hierarchyData;

    bool gotBinding;
    TreeNodeBinding binding;
    PropertyDescriptorCollection boundProperties;
    bool populating;
    bool hadChildrenBeforePopulating;
    
    internal TreeNode (TreeView tree)
    {
      Tree = tree;
    }
    
    public TreeNode ()
    {
    }
    
    public TreeNode (string text)
    {
      Text = text;
    }
    
    public TreeNode (string text, string value)
    {
      Text = text;
      Value = value;
    }
    
    public TreeNode (string text, string value, string imageUrl)
    {
      Text = text;
      Value = value;
      ImageUrl = imageUrl;
    }
    
    public TreeNode (string text, string value, string imageUrl, string navigateUrl, string target)
    {
      Text = text;
      Value = value;
      ImageUrl = imageUrl;
      NavigateUrl = navigateUrl;
      Target = target;
    }
    
    [MonoTODO ("Not implemented")]
    protected TreeNode (TreeView owner, bool isRoot)
    {
      throw new NotImplementedException ();
    }

    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [Browsable (false)]
    public int Depth {
      get {
        if (depth != -1) return depth;
        depth = 0;
        TreeNode nod = parent;
        while (nod != null) {
          depth++;
          nod = nod.parent;
        }
        return depth;
      }
    }
    
    void ResetPathData ()
    {
      path = null;
      depth = -1;
      gotBinding = false;
      if (nodes != null) {
        foreach (TreeNode node in nodes)
          node.ResetPathData ();
      }
    }
    
    internal TreeView Tree {
      get { return tree; }
      set {
        if (SelectedFlag) {
          if (value != null)
            value.SetSelectedNode (this, false);
          if (tree != null)
            tree.SetSelectedNode (null, false);
        }
        tree = value;
        if (nodes != null)
          nodes.SetTree (tree);
        ResetPathData ();
        if (PopulateOnDemand && !Populated && Expanded.HasValue && Expanded.Value)
          Populate ();
      }
    }
    
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [DefaultValue (false)]
    [Browsable (false)]
    public bool DataBound {
      get { return ViewState ["DataBound"] == null ? false : (bool) ViewState ["DataBound"]; }
      private set { ViewState ["DataBound"] = value; }
    }
    
    [DefaultValue (null)]
    [Browsable (false)]
    public object DataItem {
      get { return dataItem; }
    }
    
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [DefaultValue ("")]
    [Browsable (false)]
    public string DataPath {
      get { return ViewState ["DataPath"] == null ? String.Empty : (String) ViewState ["DataPath"]; }
      private set { ViewState ["DataPath"] = value; }
    }
    
    [DefaultValue (false)]
    public bool Checked {
      get {
        object o = ViewState ["Checked"];
        if (o != null) return (bool)o;
        return false;
      }
      set {
        ViewState ["Checked"] = value;
        if (tree != null)
          tree.NotifyCheckChanged (this);
      }
    }

    [DefaultValue (null)]
    [MergableProperty (false)]
    [Browsable (false)]
    [PersistenceMode (PersistenceMode.InnerDefaultProperty)]
    public TreeNodeCollection ChildNodes {
      get {
        if (nodes == null) {
          nodes = new TreeNodeCollection (this);
            
          if (IsTrackingViewState)
            ((IStateManager)nodes).TrackViewState();
        }
        return nodes;
      }
    }
    
    [DefaultValue (null)]
    public bool? Expanded {
      get {
        object o = ViewState ["Expanded"];
        return (bool?)o;
      }
      set {
        bool? current = (bool?) ViewState ["Expanded"];
        if (current == value)
          return;
        ViewState ["Expanded"] = value;
        if (tree != null)
          tree.NotifyExpandedChanged (this);
        if (PopulateOnDemand && !Populated && value.HasValue && value.Value)
          Populate ();
      }
    }

    [Localizable (true)]
    [DefaultValue ("")]
    public string ImageToolTip {
      get {
        object o = ViewState ["ImageToolTip"];
        if (o != null)
          return (string)o;
        return String.Empty;
      }
      set { ViewState ["ImageToolTip"] = value; }
    }
    
    [DefaultValue ("")]
    [UrlProperty]
    [Editor ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
    public string ImageUrl {
      get {
        object o = ViewState ["ImageUrl"];
        if (o != null)
          return (string)o;
        return String.Empty;
      }
      set { ViewState ["ImageUrl"] = value; }
    }

    [DefaultValue ("")]
    [UrlProperty]
    [Editor ("System.Web.UI.Design.UrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
    public string NavigateUrl {
      get {
        object o = ViewState ["NavigateUrl"];
        if (o != null)
          return (string)o;
        return String.Empty;
      }
      set { ViewState ["NavigateUrl"] = value; }
    }

    internal bool HadChildrenBeforePopulating {
      get { return hadChildrenBeforePopulating; }
      set {
        if (populating)
          return;

        hadChildrenBeforePopulating = value;
      }
    }
    
    [DefaultValue (false)]
    public bool PopulateOnDemand {
      get {
        object o = ViewState ["PopulateOnDemand"];
        if (o != null)
          return (bool)o;
        return false;
      }
      set {
        ViewState ["PopulateOnDemand"] = value;
        if (value && nodes != null && nodes.Count > 0)
          HadChildrenBeforePopulating = true;
        else
          HadChildrenBeforePopulating = false;
      }
    }

    [DefaultValue (TreeNodeSelectAction.Select)]
    public TreeNodeSelectAction SelectAction {
      get {
        object o = ViewState ["SelectAction"];
        if (o != null)
          return (TreeNodeSelectAction)o;
        return TreeNodeSelectAction.Select;
      }
      set { ViewState ["SelectAction"] = value; }
    }

    [DefaultValue (null)]
    public bool? ShowCheckBox {
      get {
        object o = ViewState ["ShowCheckBox"];
        return (bool?)o;
      }
      set { ViewState ["ShowCheckBox"] = value; }
    }

    internal bool ShowCheckBoxInternal {
      get {
        if (ShowCheckBox.HasValue)
          return ShowCheckBox.Value;
        else
          return (Tree.ShowCheckBoxes == TreeNodeTypes.All) ||
             ((Tree.ShowCheckBoxes & TreeNodeTypes.Leaf) > 0 && IsLeafNode) ||
             ((Tree.ShowCheckBoxes & TreeNodeTypes.Parent) > 0 && IsParentNode && Parent != null) ||
             ((Tree.ShowCheckBoxes & TreeNodeTypes.Root) > 0 && Parent == null && ChildNodes.Count > 0);
      }
    }
    
    [DefaultValue ("")]
    public string Target {
      get {
        object o = ViewState ["Target"];
        if(o != null)
          return (string)o;
        return String.Empty;
      }
      set { ViewState ["Target"] = value; }
    }

    [Localizable (true)]
    [DefaultValue ("")]
    [WebSysDescription ("The display text of the tree node.")]
    public string Text {
      get {
        object o = ViewState ["Text"];
        if (o == null)
          o = ViewState ["Value"];
        if (o != null)
          return (string)o;
        return String.Empty;
      }
      set { ViewState ["Text"] = value; }
    }

    [Localizable (true)]
    [DefaultValue ("")]
    public string ToolTip {
      get {
        object o = ViewState ["ToolTip"];
        if(o != null)
          return (string)o;
        return String.Empty;
      }
      set { ViewState ["ToolTip"] = value; }
    }

    [Localizable (true)]
    [DefaultValue ("")]
    public string Value {
      get {
        object o = ViewState ["Value"];
        if (o == null)
          o = ViewState ["Text"];
        if(o != null)
          return (string)o;
        return String.Empty;
      }
      set { ViewState ["Value"] = value; }
    }
    
    [DefaultValue (false)]
    public bool Selected {
      get { return SelectedFlag; }
      set {
        SelectedFlag = value;
        
        if (tree != null) {
          if (!value && tree.SelectedNode == this)
            tree.SetSelectedNode (null, false);
          else if (value)
            tree.SetSelectedNode (this, false);
        }
      }
    }
    
    internal virtual bool SelectedFlag {
      get {
        object o = ViewState ["Selected"];
        if(o != null)
          return (bool)o;
        return false;
      }
      set { ViewState ["Selected"] = value; }
    }
    
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [Browsable (false)]
    public TreeNode Parent {
      get { return parent; }
    }
    
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [Browsable (false)]
    public string ValuePath {
      get {
        if (tree == null) return Value;
        
        StringBuilder sb = new StringBuilder (Value);
        TreeNode node = parent;
        while (node != null) {
          sb.Insert (0, tree.PathSeparator);
          sb.Insert (0, node.Value);
          node = node.Parent;
        }
        return sb.ToString ();
      }
    }
    
    internal int Index {
      get { return index; }
      set { index = value; ResetPathData (); }
    }
    
    internal void SetParent (TreeNode node)
    {
      parent = node;
      ResetPathData ();
    }
    
    internal string Path {
      get {
        if (path != null)
          return path;
        StringBuilder sb = new StringBuilder (index.ToString());
        TreeNode node = parent;
        while (node != null) {
          sb.Insert (0, '_');
          sb.Insert (0, node.Index.ToString ());
          node = node.Parent;
        }
        path = sb.ToString ();
        return path;
      }
    }
    
    internal bool Populated {
      get {
        object o = ViewState ["Populated"];
        if (o != null)
          return (bool) o;
        return false;
      }
      set { ViewState ["Populated"] = value; }
    }

    internal bool HasChildData {
      get { return nodes != null; }
    }
    
    internal void Populate ()
    {
      if (tree == null)
        return;

      populating = true;
      tree.NotifyPopulateRequired (this);
      populating = false;
      Populated = true;
    }
    
    public void Collapse ()
    {
      Expanded = false;
    }

    public void CollapseAll ()
    {
      SetExpandedRec (false, -1);
    }

    public void Expand ()
    {
      Expanded = true;
    }

    internal void Expand (int depth)
    {
      SetExpandedRec (true, depth);
    }

    public void ExpandAll ()
    {
      SetExpandedRec (true, -1);
    }
    
    void SetExpandedRec (bool expanded, int depth)
    {
      Expanded = expanded;
      if (depth == 0)
        return;
      
      foreach (TreeNode nod in ChildNodes)
        nod.SetExpandedRec (expanded, depth - 1);
    }
    
    public void Select ()
    {
      Selected = true;
    }
    
    public void ToggleExpandState ()
    {
#if TARGET_JVM //No support for Nullable<bool>.GetValueOrDefault() yet
      bool? value = Expanded;
      Expanded = value.HasValue ? !value.Value : true;
#else
      Expanded = !Expanded.GetValueOrDefault(false);
#endif
    }

    void IStateManager.LoadViewState (object savedState)
    {
      LoadViewState (savedState);
    }

    protected virtual void LoadViewState (object savedState)
    {
      if (savedState == null)
        return;

      object[] states = (object[]) savedState;
      ViewState.LoadViewState (states [0]);
      
      if (tree != null && SelectedFlag)
        tree.SetSelectedNode (this, true);
      
      if (!PopulateOnDemand || Populated)
        ((IStateManager)ChildNodes).LoadViewState (states [1]);
    }
    
    object IStateManager.SaveViewState ()
    {
      return SaveViewState ();
    }

    protected virtual object SaveViewState ()
    {
      object[] states = new object[2];
      states[0] = ViewState.SaveViewState();
      states[1] = (nodes == null ? null : ((IStateManager)nodes).SaveViewState());
      
      for (int i = 0; i < states.Length; i++) {
        if (states [i] != null)
          return states;
      }
      return null;
    }

    void IStateManager.TrackViewState ()
    {
      TrackViewState ();
    }

    protected void TrackViewState ()
    {
      if (marked) return;
      marked = true;
      ViewState.TrackViewState();

      if (nodes != null)
        ((IStateManager)nodes).TrackViewState ();
    }
    
    bool IStateManager.IsTrackingViewState {
      get { return IsTrackingViewState; }
    }

    protected bool IsTrackingViewState {
      get { return marked; }
    }
    
    internal void SetDirty ()
    {
      ViewState.SetDirty (true);
      if (nodes != null)
        nodes.SetDirty ();
    }
    
    public virtual object Clone ()
    {
      TreeNode nod = tree != null ? tree.CreateNode () : new TreeNode ();
      foreach (DictionaryEntry e in ViewState)
        nod.ViewState [(string)e.Key] = ((StateItem)e.Value).Value;
        
      foreach (TreeNode c in ChildNodes)
        nod.ChildNodes.Add ((TreeNode)c.Clone ());
        
      return nod;
    }

    object ICloneable.Clone ()
    {
      return Clone ();
    }
    
    internal void Bind (IHierarchyData hierarchyData)
    {
      this.hierarchyData = hierarchyData;
      DataBound = true;
      DataPath = hierarchyData.Path;
      dataItem = hierarchyData.Item;
      
      TreeNodeBinding bin = GetBinding ();
      if (bin != null) {
      
        // Bind ImageToolTip property

        if (bin.ImageToolTipField.Length > 0) {
          ImageToolTip = Convert.ToString (GetBoundPropertyValue (bin.ImageToolTipField));
          if (ImageToolTip.Length == 0)
            ImageToolTip = bin.ImageToolTip;
        } else if (bin.ImageToolTip.Length > 0)
          ImageToolTip = bin.ImageToolTip;
          
        // Bind ImageUrl property

        if (bin.ImageUrlField.Length > 0) {
          ImageUrl = Convert.ToString (GetBoundPropertyValue (bin.ImageUrlField));
          if (ImageUrl.Length == 0)
            ImageUrl = bin.ImageUrl;
        } else if (bin.ImageUrl.Length > 0)
          ImageUrl = bin.ImageUrl;
          
        // Bind NavigateUrl property

        if (bin.NavigateUrlField.Length > 0) {
          NavigateUrl = Convert.ToString (GetBoundPropertyValue (bin.NavigateUrlField));
          if (NavigateUrl.Length == 0)
            NavigateUrl = bin.NavigateUrl;
        } else if (bin.NavigateUrl.Length > 0)
          NavigateUrl = bin.NavigateUrl;
          
        // Bind PopulateOnDemand property
        
        if (bin.HasPropertyValue ("PopulateOnDemand"))
          PopulateOnDemand = bin.PopulateOnDemand;
        
        // Bind SelectAction property
          
        if (bin.HasPropertyValue ("SelectAction"))
          SelectAction = bin.SelectAction;
        
        // Bind ShowCheckBox property
          
        if (bin.HasPropertyValue ("ShowCheckBox"))
          ShowCheckBox = bin.ShowCheckBox;
          
        // Bind Target property

        if (bin.TargetField.Length > 0) {
          Target = Convert.ToString (GetBoundPropertyValue (bin.TargetField));
          if (Target.Length == 0)
            Target = bin.Target;
        } else if (bin.Target.Length > 0)
          Target = bin.Target;
          
        // Bind Text property
        string text = null;
        if (bin.TextField.Length > 0) {
          text = Convert.ToString (GetBoundPropertyValue (bin.TextField));
          if (bin.FormatString.Length > 0)
            text = string.Format (bin.FormatString, text);
        }
        if (String.IsNullOrEmpty (text)) {
          if (bin.Text.Length > 0)
            text = bin.Text;
          else if (bin.Value.Length > 0)
            text = bin.Value;
        }
        if (!String.IsNullOrEmpty (text))
          Text = text;
          
        // Bind ToolTip property

        if (bin.ToolTipField.Length > 0) {
          ToolTip = Convert.ToString (GetBoundPropertyValue (bin.ToolTipField));
          if (ToolTip.Length == 0)
            ToolTip = bin.ToolTip;
        } else if (bin.ToolTip.Length > 0)
          ToolTip = bin.ToolTip;
          
        // Bind Value property
        string value = null;
        if (bin.ValueField.Length > 0) {
          value = Convert.ToString (GetBoundPropertyValue (bin.ValueField));
        }
        if (String.IsNullOrEmpty (value)) {
          if (bin.Value.Length > 0)
            value = bin.Value;
          else if (bin.Text.Length > 0)
            value = bin.Text;
        }
        if (!String.IsNullOrEmpty (value))
          Value = value;
      } else {
        Text = Value = GetDefaultBoundText ();
      }

      INavigateUIData navigateUIData = hierarchyData as INavigateUIData;
      if (navigateUIData != null) {
        SelectAction = TreeNodeSelectAction.None;
        Text = navigateUIData.ToString ();
        NavigateUrl = navigateUIData.NavigateUrl;
        ToolTip = navigateUIData.Description;
      }
    }
    
    internal void SetDataItem (object item)
    {
      dataItem = item;
    }
    
    internal void SetDataPath (string path)
    {
      DataPath = path;
    }
    
    internal void SetDataBound (bool bound)
    {
      DataBound = bound;
    }
    
    string GetDefaultBoundText ()
    {
      if (hierarchyData != null)
        return hierarchyData.ToString ();
      else if (dataItem != null)
        return dataItem.ToString ();
      else
        return string.Empty;
    }
    
    string GetDataItemType ()
    {
      if (hierarchyData != null)
        return hierarchyData.Type;
      else if (dataItem != null)
        return dataItem.GetType().ToString ();
      else
        return string.Empty;
    }
        
    internal bool IsParentNode {
      get { return ChildNodes.Count > 0 || (PopulateOnDemand && !Populated); }
    }
    
    internal bool IsLeafNode {
      get { return !IsParentNode; }
    }
    
    internal bool IsRootNode {
      get { return Depth == 0; }
    }
    
    TreeNodeBinding GetBinding ()
    {
      if (tree == null)
        return null;
      if (gotBinding)
        return binding;
      binding = tree.FindBindingForNode (GetDataItemType (), Depth);
      gotBinding = true;
      return binding;
    }
    
    object GetBoundPropertyValue (string name)
    {
      if (boundProperties == null) {
        if (hierarchyData != null)
          boundProperties = TypeDescriptor.GetProperties (hierarchyData);
        else
          boundProperties = TypeDescriptor.GetProperties (dataItem);
      }
      
      PropertyDescriptor prop = boundProperties.Find (name, true);
      if (prop == null)
        throw new InvalidOperationException ("Property '" + name + "' not found in data bound item");
        
      if (hierarchyData != null)
        return prop.GetValue (hierarchyData);
      else
        return prop.GetValue (dataItem);
    }

    internal void BeginRenderText (HtmlTextWriter writer)
    {
      RenderPreText (writer);
    }
    
    internal void EndRenderText (HtmlTextWriter writer)
    {
      RenderPostText (writer);
    }
    
    protected virtual void RenderPreText (HtmlTextWriter writer)
    {
    }
    
    protected virtual void RenderPostText (HtmlTextWriter writer)
    {
    }
  }
}
#endif
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