public void OnChecked()
{
if (!_isUpdating)
{
_isUpdating = true;
CheckState checkState = _parentTree.Binding.ToggleCheckState(_item);
if (_bindingTreeView.CheckBoxes)
{
this.StateImageKey = checkState.ToString();
}
_isUpdating = false;
}
}
private void UpdateDisplay(ImageList treeViewImageList)
{
// Remember the previous update state, and return to it afterward.
var wasStillUpdating = _isUpdating;
_isUpdating = true;
if (this.TreeView != null)
{
this.TreeView.BeginUpdate();
}
// update all displayable attributes from the binding
this.Text = _parentTree.Binding.GetNodeText(_item);
this.ToolTipText = _parentTree.Binding.GetTooltipText(_item);
CheckState checkState = _parentTree.Binding.GetCheckState(_item);
if (_bindingTreeView.CheckBoxes)
{
this.StateImageKey = checkState.ToString();
}
if (_parentTree.Binding.GetIsHighlighted(_item))
{
this.BackColor = System.Drawing.Color.FromArgb(124, 177, 221);
}
else
{
this.BackColor = System.Drawing.Color.Empty;
}
if (treeViewImageList != null)
{
var resolver = _parentTree.Binding.GetResourceResolver(_item);
var iconSet = _parentTree.Binding.GetIconSet(_item);
var imageCollection = treeViewImageList.Images;
if (iconSet == null)
{
this.ImageKey = string.Empty;
}
else
{
try
{
var iconKey = iconSet.GetIconKey(_bindingTreeView.IconResourceSize, resolver);
if (!imageCollection.ContainsKey(iconKey))
{
imageCollection.Add(iconKey, iconSet.CreateIcon(_bindingTreeView.IconResourceSize, resolver));
}
this.ImageKey = iconKey;
}
catch (Exception e)
{
Platform.Log(LogLevel.Debug, e);
this.ImageKey = string.Empty;
}
}
this.SelectedImageKey = this.ImageKey;
}
// if the subtree was already built, we may need to rebuild it if it has changed
if (_isSubTreeBuilt)
{
// rebuild the subtree only if the binding returns a different reference
if (_parentTree.Binding.GetSubTree(_item) != _subtreeManager.Tree)
{
RebuildSubTree();
}
}
else
{
// add a dummy child so that we get a "plus" sign next to the node
if (_parentTree.Binding.CanHaveSubTree(_item) && this.Nodes.Count == 0)
{
this.Nodes.Add(new TreeNode(SR.MessageErrorRetrievingSubtree));
}
}
if (this.TreeView != null)
{
this.TreeView.EndUpdate();
}
// check whether to start in expanded or collapsed state
if (_parentTree.Binding.GetExpanded(_item))
{
this.Expand();
}
else
{
this.Collapse();
}
// Return the updating flag back to the previous update state, rather than setting it to null.
_isUpdating = wasStillUpdating;
}