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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Windows;
using System.ComponentModel;
using System.Collections.ObjectModel;
using System.Windows.Controls;
using System.Collections.Specialized;
using System.Windows.Input;
using System.Windows.Media;
namespace ICSharpCode.TreeView
{
public partial class SharpTreeNode : INotifyPropertyChanged
{
SharpTreeNodeCollection modelChildren;
internal SharpTreeNode modelParent;
bool isVisible = true;
void UpdateIsVisible(bool parentIsVisible, bool updateFlattener)
{
bool newIsVisible = parentIsVisible && !isHidden;
if (isVisible != newIsVisible) {
isVisible = newIsVisible;
// invalidate the augmented data
SharpTreeNode node = this;
while (node != null && node.totalListLength >= 0) {
node.totalListLength = -1;
node = node.listParent;
}
// Remember the removed nodes:
List<SharpTreeNode> removedNodes = null;
if (updateFlattener && !newIsVisible) {
removedNodes = VisibleDescendantsAndSelf().ToList();
}
// also update the model children:
UpdateChildIsVisible(false);
// Validate our invariants:
if (updateFlattener)
CheckRootInvariants();
// Tell the flattener about the removed nodes:
if (removedNodes != null) {
var flattener = GetListRoot().treeFlattener;
if (flattener != null) {
flattener.NodesRemoved(GetVisibleIndexForNode(this), removedNodes);
foreach (var n in removedNodes)
n.OnIsVisibleChanged();
}
}
// Tell the flattener about the new nodes:
if (updateFlattener && newIsVisible) {
var flattener = GetListRoot().treeFlattener;
if (flattener != null) {
flattener.NodesInserted(GetVisibleIndexForNode(this), VisibleDescendantsAndSelf());
foreach (var n in VisibleDescendantsAndSelf())
n.OnIsVisibleChanged();
}
}
}
}
protected virtual void OnIsVisibleChanged() {}
void UpdateChildIsVisible(bool updateFlattener)
{
if (modelChildren != null && modelChildren.Count > 0) {
bool showChildren = isVisible && isExpanded;
foreach (SharpTreeNode child in modelChildren) {
child.UpdateIsVisible(showChildren, updateFlattener);
}
}
}
#region Main
public SharpTreeNode()
{
}
public SharpTreeNodeCollection Children {
get {
if (modelChildren == null)
modelChildren = new SharpTreeNodeCollection(this);
return modelChildren;
}
}
public SharpTreeNode Parent {
get { return modelParent; }
}
public virtual object Text
{
get { return null; }
}
public virtual Brush Foreground {
get { return SystemColors.WindowTextBrush; }
}
public virtual object Icon
{
get { return null; }
}
public virtual object ToolTip
{
get { return null; }
}
public int Level
{
get { return Parent != null ? Parent.Level + 1 : 0; }
}
public bool IsRoot
{
get { return Parent == null; }
}
public virtual bool SingleClickExpandsChildren {
get { return false; }
}
bool isHidden;
public bool IsHidden
{
get { return isHidden; }
set {
if (isHidden != value) {
isHidden = value;
if (modelParent != null)
UpdateIsVisible(modelParent.isVisible && modelParent.isExpanded, true);
RaisePropertyChanged("IsHidden");
if (Parent != null)
Parent.RaisePropertyChanged("ShowExpander");
}
}
}
/// <summary>
/// Return true when this node is not hidden and when all parent nodes are expanded and not hidden.
/// </summary>
public bool IsVisible {
get { return isVisible; }
}
bool isSelected;
public bool IsSelected {
get { return isSelected; }
set {
if (isSelected != value) {
isSelected = value;
RaisePropertyChanged("IsSelected");
}
}
}
#endregion
#region OnChildrenChanged
internal protected virtual void OnChildrenChanged(NotifyCollectionChangedEventArgs e)
{
var flattener = GetListRoot().treeFlattener;
if (e.OldItems != null) {
foreach (SharpTreeNode node in e.OldItems) {
Debug.Assert(node.modelParent == this);
node.modelParent = null;
//Debug.WriteLine("Removing {0} from {1}", node, this);
SharpTreeNode removeEnd = node;
while (removeEnd.modelChildren != null && removeEnd.modelChildren.Count > 0)
removeEnd = removeEnd.modelChildren.Last();
List<SharpTreeNode> removedNodes = null;
int visibleIndexOfRemoval = 0;
if (node.isVisible) {
visibleIndexOfRemoval = GetVisibleIndexForNode(node);
removedNodes = node.VisibleDescendantsAndSelf().ToList();
}
RemoveNodes(node, removeEnd);
if (removedNodes != null) {
if (flattener != null) {
flattener.NodesRemoved(visibleIndexOfRemoval, removedNodes);
}
}
}
}
if (e.NewItems != null) {
SharpTreeNode insertionPos;
if (e.NewStartingIndex == 0)
insertionPos = null;
else
insertionPos = modelChildren[e.NewStartingIndex - 1];
foreach (SharpTreeNode node in e.NewItems) {
Debug.Assert(node.modelParent == null);
node.modelParent = this;
node.UpdateIsVisible(isVisible && isExpanded, false);
//Debug.WriteLine("Inserting {0} after {1}", node, insertionPos);
while (insertionPos != null && insertionPos.modelChildren != null && insertionPos.modelChildren.Count > 0) {
insertionPos = insertionPos.modelChildren.Last();
}
InsertNodeAfter(insertionPos ?? this, node);
insertionPos = node;
if (node.isVisible) {
if (flattener != null) {
flattener.NodesInserted(GetVisibleIndexForNode(node), node.VisibleDescendantsAndSelf());
}
}
}
}
RaisePropertyChanged("ShowExpander");
RaiseIsLastChangedIfNeeded(e);
}
#endregion
#region Expanding / LazyLoading
public virtual object ExpandedIcon
{
get { return Icon; }
}
public virtual bool ShowExpander
{
get { return LazyLoading || Children.Any(c => !c.isHidden); }
}
bool isExpanded;
public bool IsExpanded
{
get { return isExpanded; }
set
{
if (isExpanded != value) {
isExpanded = value;
if (isExpanded) {
EnsureLazyChildren();
OnExpanding();
} else {
OnCollapsing();
}
UpdateChildIsVisible(true);
RaisePropertyChanged("IsExpanded");
}
}
}
protected virtual void OnExpanding() {}
protected virtual void OnCollapsing() {}
bool lazyLoading;
public bool LazyLoading
{
get { return lazyLoading; }
set
{
lazyLoading = value;
if (lazyLoading) {
IsExpanded = false;
if (canExpandRecursively) {
canExpandRecursively = false;
RaisePropertyChanged("CanExpandRecursively");
}
}
RaisePropertyChanged("LazyLoading");
RaisePropertyChanged("ShowExpander");
}
}
bool canExpandRecursively = true;
/// <summary>
/// Gets whether this node can be expanded recursively.
/// If not overridden, this property returns false if the node is using lazy-loading, and true otherwise.
/// </summary>
public virtual bool CanExpandRecursively {
get { return canExpandRecursively; }
}
public virtual bool ShowIcon
{
get { return Icon != null; }
}
protected virtual void LoadChildren()
{
throw new NotSupportedException(GetType().Name + " does not support lazy loading");
}
/// <summary>
/// Ensures the children were initialized (loads children if lazy loading is enabled)
/// </summary>
public void EnsureLazyChildren()
{
if (LazyLoading) {
LazyLoading = false;
LoadChildren();
}
}
#endregion
#region Ancestors / Descendants
public IEnumerable<SharpTreeNode> Descendants()
{
return TreeTraversal.PreOrder(this.Children, n => n.Children);
}
public IEnumerable<SharpTreeNode> DescendantsAndSelf()
{
return TreeTraversal.PreOrder(this, n => n.Children);
}
internal IEnumerable<SharpTreeNode> VisibleDescendants()
{
return TreeTraversal.PreOrder(this.Children.Where(c => c.isVisible), n => n.Children.Where(c => c.isVisible));
}
internal IEnumerable<SharpTreeNode> VisibleDescendantsAndSelf()
{
return TreeTraversal.PreOrder(this, n => n.Children.Where(c => c.isVisible));
}
public IEnumerable<SharpTreeNode> Ancestors()
{
for (var n = Parent; n != null; n = n.Parent)
yield return n;
}
public IEnumerable<SharpTreeNode> AncestorsAndSelf()
{
for (var n = this; n != null; n = n.Parent)
yield return n;
}
#endregion
#region Editing
public virtual bool IsEditable
{
get { return false; }
}
bool isEditing;
public bool IsEditing
{
get { return isEditing; }
set
{
if (isEditing != value) {
isEditing = value;
RaisePropertyChanged("IsEditing");
}
}
}
public virtual string LoadEditText()
{
return null;
}
public virtual bool SaveEditText(string value)
{
return true;
}
#endregion
#region Checkboxes
public virtual bool IsCheckable {
get { return false; }
}
bool? isChecked;
public bool? IsChecked {
get { return isChecked; }
set {
SetIsChecked(value, true);
}
}
void SetIsChecked(bool? value, bool update)
{
if (isChecked != value) {
isChecked = value;
if (update) {
if (IsChecked != null) {
foreach (var child in Descendants()) {
if (child.IsCheckable) {
child.SetIsChecked(IsChecked, false);
}
}
}
foreach (var parent in Ancestors()) {
if (parent.IsCheckable) {
if (!parent.TryValueForIsChecked(true)) {
if (!parent.TryValueForIsChecked(false)) {
parent.SetIsChecked(null, false);
}
}
}
}
}
RaisePropertyChanged("IsChecked");
}
}
bool TryValueForIsChecked(bool? value)
{
if (Children.Where(n => n.IsCheckable).All(n => n.IsChecked == value)) {
SetIsChecked(value, false);
return true;
}
return false;
}
#endregion
#region Cut / Copy / Paste / Delete
public bool IsCut { get { return false; } }
/*
static List<SharpTreeNode> cuttedNodes = new List<SharpTreeNode>();
static IDataObject cuttedData;
static EventHandler requerySuggestedHandler; // for weak event
static void StartCuttedDataWatcher()
{
requerySuggestedHandler = new EventHandler(CommandManager_RequerySuggested);
CommandManager.RequerySuggested += requerySuggestedHandler;
}
static void CommandManager_RequerySuggested(object sender, EventArgs e)
{
if (cuttedData != null && !Clipboard.IsCurrent(cuttedData)) {
ClearCuttedData();
}
}
static void ClearCuttedData()
{
foreach (var node in cuttedNodes) {
node.IsCut = false;
}
cuttedNodes.Clear();
cuttedData = null;
}
//static public IEnumerable<SharpTreeNode> PurifyNodes(IEnumerable<SharpTreeNode> nodes)
//{
// var list = nodes.ToList();
// var array = list.ToArray();
// foreach (var node1 in array) {
// foreach (var node2 in array) {
// if (node1.Descendants().Contains(node2)) {
// list.Remove(node2);
// }
// }
// }
// return list;
//}
bool isCut;
public bool IsCut
{
get { return isCut; }
private set
{
isCut = value;
RaisePropertyChanged("IsCut");
}
}
internal bool InternalCanCut()
{
return InternalCanCopy() && InternalCanDelete();
}
internal void InternalCut()
{
ClearCuttedData();
cuttedData = Copy(ActiveNodesArray);
Clipboard.SetDataObject(cuttedData);
foreach (var node in ActiveNodes) {
node.IsCut = true;
cuttedNodes.Add(node);
}
}
internal bool InternalCanCopy()
{
return CanCopy(ActiveNodesArray);
}
internal void InternalCopy()
{
Clipboard.SetDataObject(Copy(ActiveNodesArray));
}
internal bool InternalCanPaste()
{
return CanPaste(Clipboard.GetDataObject());
}
internal void InternalPaste()
{
Paste(Clipboard.GetDataObject());
if (cuttedData != null) {
DeleteCore(cuttedNodes.ToArray());
ClearCuttedData();
}
}
*/
public virtual bool CanDelete()
{
return false;
}
public virtual void Delete()
{
throw new NotSupportedException(GetType().Name + " does not support deletion");
}
public virtual void DeleteCore()
{
throw new NotSupportedException(GetType().Name + " does not support deletion");
}
public virtual IDataObject Copy(SharpTreeNode[] nodes)
{
throw new NotSupportedException(GetType().Name + " does not support copy/paste or drag'n'drop");
}
/*
public virtual bool CanCopy(SharpTreeNode[] nodes)
{
return false;
}
public virtual bool CanPaste(IDataObject data)
{
return false;
}
public virtual void Paste(IDataObject data)
{
EnsureLazyChildren();
Drop(data, Children.Count, DropEffect.Copy);
}
*/
#endregion
#region Drag and Drop
public virtual bool CanDrag(SharpTreeNode[] nodes)
{
return false;
}
public virtual void StartDrag(DependencyObject dragSource, SharpTreeNode[] nodes)
{
DragDropEffects effects = DragDropEffects.All;
if (!nodes.All(n => n.CanDelete()))
effects &= ~DragDropEffects.Move;
DragDropEffects result = DragDrop.DoDragDrop(dragSource, Copy(nodes), effects);
if (result == DragDropEffects.Move) {
foreach (SharpTreeNode node in nodes)
node.DeleteCore();
}
}
public virtual bool CanDrop(DragEventArgs e, int index)
{
return false;
}
internal void InternalDrop(DragEventArgs e, int index)
{
if (LazyLoading) {
EnsureLazyChildren();
index = Children.Count;
}
Drop(e, index);
}
public virtual void Drop(DragEventArgs e, int index)
{
throw new NotSupportedException(GetType().Name + " does not support Drop()");
}
#endregion
#region IsLast (for TreeView lines)
public bool IsLast
{
get
{
return Parent == null ||
Parent.Children.Count == 0 ||
Parent.Children[Parent.Children.Count - 1] == this;
}
}
void RaiseIsLastChangedIfNeeded(NotifyCollectionChangedEventArgs e)
{
switch (e.Action) {
case NotifyCollectionChangedAction.Add:
if (e.NewStartingIndex == Children.Count - 1) {
if (Children.Count > 1) {
Children[Children.Count - 2].RaisePropertyChanged(nameof(IsLast));
}
Children[Children.Count - 1].RaisePropertyChanged(nameof(IsLast));
}
break;
case NotifyCollectionChangedAction.Remove:
if (e.OldStartingIndex == Children.Count) {
if (Children.Count > 0) {
Children[Children.Count - 1].RaisePropertyChanged(nameof(IsLast));
}
}
break;
}
}
#endregion
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected bool HasPropertyChangedHandlers {
get { return PropertyChanged != null; }
}
public void RaisePropertyChanged(string name)
{
if (PropertyChanged != null) {
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
#endregion
/// <summary>
/// Gets called when the item is double-clicked.
/// </summary>
public virtual void ActivateItem(RoutedEventArgs e)
{
}
public override string ToString()
{
// used for keyboard navigation
object text = this.Text;
return text != null ? text.ToString() : string.Empty;
}
}
}