private void InitProperties()
{
mvarDropHighLightNode = null;
mvarDropLinePosition = DropLinePositionEnum.None;
mvarDropHighLightBackColor = SystemColors.Highlight;
mvarDropHighLightForeColor = SystemColors.HighlightText;
mvarDropLineColor = SystemColors.ControlText;
mvarEdgeSensitivity = 0;
mvarDropLineWidth = 2;
}
private void SetDropHighlightNode(UltraTreeNode Node, DropLinePositionEnum DropLinePosition)
{
//Use to store whether there have been any changes in
//DropNode or DropLinePosition
bool IsPositionChanged = false;
try
{
//Check to see if the nodes are equal and if
//the dropline position are equal
if (mvarDropHighLightNode != null && mvarDropHighLightNode.Equals(Node) &&
(mvarDropLinePosition == DropLinePosition))
{
//They are both equal. Nothing has changed.
IsPositionChanged = false;
}
else
{
//One or both have changed
IsPositionChanged = true;
}
}
catch
{
//If we reach this code, it means mvarDropHighLightNode
//is null, so it could not be compared
if (mvarDropHighLightNode == null)
{
//Check to see if Node is nothing, so we//ll know
//if Node = mvarDropHighLightNode
IsPositionChanged = !(Node == null);
}
}
//Set both properties without calling PositionChanged
mvarDropHighLightNode = Node;
mvarDropLinePosition = DropLinePosition;
//Check to see if the PositionChanged
if (IsPositionChanged)
{
//Position did change.
PositionChanged();
}
}
