private void drawDragBar(DropPositionEnum position)
{
if (previousNode != targetNode)
{
Refresh();
}
Point upperLeft = new Point(targetNode.Bounds.Left, targetNode.Bounds.Top);
Point bottomRight = new Point(targetNode.Bounds.Right, targetNode.Bounds.Bottom);
// reset previous node highlight color
if (highlightedNode != null)
{
highlightedNode.ForeColor = originalForeColor;
highlightedNode.BackColor = originalBackColor;
highlightedNode = null;
}
int leftPos, rightPos, vertPos;
leftPos = upperLeft.X - 22;
rightPos = treeView.Width - 4;
if (position == DropPositionEnum.Before)
{
vertPos = upperLeft.Y;
}
else
{
vertPos = bottomRight.Y;
}
// edge marker
Point[] LeftTriangle = new Point[5] {
new Point(leftPos, vertPos - 3),
new Point(leftPos, vertPos + 3),
new Point(leftPos + 3, vertPos),
new Point(leftPos + 3, vertPos - 1),
new Point(leftPos, vertPos - 4)
};
Point[] RightTriangle = new Point[5] {
new Point(rightPos, vertPos - 3),
new Point(rightPos, vertPos + 3),
new Point(rightPos - 3, vertPos),
new Point(rightPos - 3, vertPos - 1),
new Point(rightPos, vertPos - 4)
};
Graphics g = treeView.CreateGraphics();
g.FillPolygon(System.Drawing.Brushes.Black, LeftTriangle);
g.FillPolygon(System.Drawing.Brushes.Black, RightTriangle);
g.DrawLine(new System.Drawing.Pen(Color.Black, 2),
new Point(leftPos, vertPos),
new Point(rightPos, vertPos));
dragBarVisible = true;
}
public void UpdateTarget(MouseDevice mouseDevice, FrameworkElement target, Orientation orientation)
{
Point itemsControlTestPoint = mouseDevice.GetPosition(AdornedElement);
Point targetTestPoint = mouseDevice.GetPosition(target);
Vector offset = itemsControlTestPoint - targetTestPoint;
double width = target.ActualWidth;
double height = target.ActualHeight;
this.leftTop = new Point(offset.X, offset.Y);
this.topRight = new Point(offset.X + width, offset.Y);
this.rightBottom = new Point(offset.X + width, offset.Y + height);
this.bottomLeft = new Point(offset.X, offset.Y + height);
double centerWidth = width / 2d;
double centerHight = height / 2d;
this.direction = DirectionEnum.None;
switch (orientation)
{
case Orientation.Horizontal:
{
this.direction |= DirectionEnum.Top;
this.direction |= DirectionEnum.Bottom;
if (targetTestPoint.X <= centerWidth)
{
this.direction |= DirectionEnum.Left;
}
else
{
this.direction |= DirectionEnum.Right;
}
}
break;
default:
case Orientation.Vertical:
{
this.direction |= DirectionEnum.Right;
this.direction |= DirectionEnum.Left;
if (targetTestPoint.Y <= centerHight)
{
this.direction |= DirectionEnum.Top;
}
else
{
this.direction |= DirectionEnum.Bottom;
}
}
break;
}
if ((this.direction & DirectionEnum.TopLine) == DirectionEnum.TopLine)
{
DropPosition = DropPositionEnum.Before;
}
if ((this.direction & DirectionEnum.RightLine) == DirectionEnum.RightLine)
{
DropPosition = DropPositionEnum.After;
}
if ((this.direction & DirectionEnum.BottomLine) == DirectionEnum.BottomLine)
{
DropPosition = DropPositionEnum.After;
}
if ((this.direction & DirectionEnum.LeftLine) == DirectionEnum.LeftLine)
{
DropPosition = DropPositionEnum.Before;
}
InvalidateVisual();
}
private void treeView_DragOver(object sender, DragEventArgs e)
{
// grab the item being moved
movingNode = (TreeNode)e.Data.GetData(typeof(TreeNode));
if (movingNode == null)
{
return;
}
// grab the node currently being hovered over
Point mousePos = treeView.PointToClient(new Point(e.X, e.Y));
targetNode = treeView.GetNodeAt(mousePos);
// bounds for the current node being hovered over (if one exists)
Point upperLeft = new Point();
Point bottomRight = new Point();
if (targetNode != null)
{
upperLeft = new Point(targetNode.Bounds.Left, targetNode.Bounds.Top);
bottomRight = new Point(targetNode.Bounds.Right, targetNode.Bounds.Bottom);
}
// if we are hovering over a real node, it's not a child of the one we are moving, and the parent
// of the current node is not dynamic, then it's okay for a border drop (before or after a node)
bool borderDropOk = targetNode != null &&
targetNode != movingNode &&
targetNode.Tag is DBNode <T> &&
!isChild(movingNode, targetNode) &&
!((DBNode <T>)targetNode.Tag).AutoGenerated;
// if we are hovering over a real node that is not the one we are moving or it's parent, child
// or grandchild and it is not a dynamic node, then it's okay for an inner drop
bool innerDropOk = targetNode != null &&
targetNode != movingNode &&
targetNode != movingNode.Parent &&
!isChild(movingNode, targetNode) &&
targetNode.Tag is DBNode <T> &&
!((DBNode <T>)targetNode.Tag).DynamicNode &&
!((DBNode <T>)targetNode.Tag).AutoGenerated;
// determine the action to be taken based on current status
if (borderDropOk && mousePos.Y < upperLeft.Y + 4)
{
dropPosition = DropPositionEnum.Before;
}
else if (borderDropOk && !targetNode.IsExpanded && mousePos.Y > bottomRight.Y - 4)
{
dropPosition = DropPositionEnum.After;
}
else if (innerDropOk)
{
dropPosition = DropPositionEnum.Inside;
}
else
{
dropPosition = DropPositionEnum.None;
}
switch (dropPosition)
{
case DropPositionEnum.None:
e.Effect = DragDropEffects.None;
clearDragDropMarkup();
break;
case DropPositionEnum.Before:
case DropPositionEnum.After:
e.Effect = DragDropEffects.Move;
drawDragBar(dropPosition);
break;
case DropPositionEnum.Inside:
e.Effect = DragDropEffects.Move;
highlightCurrentNode();
break;
}
previousNode = targetNode;
}
