private DockCluster FindTargetCluster(DragTarget target)
{
foreach (DockCluster cluster in _clusters)
{
if (!cluster.ExcludeCluster && cluster.ScreenRect.Equals(target.ScreenRect))
{
return(cluster);
}
}
return(null);
}
/// <summary>
/// Initialize a new instance of the DockCluster class.
/// </summary>
/// <param name="paletteDragDrop">Drawing palette.</param>
/// <param name="renderer">Drawing renderer.</param>
/// <param name="target">Initial target for the cluster.</param>
public DockCluster(IPaletteDragDrop paletteDragDrop,
IRenderer renderer,
DragTarget target)
{
_paletteDragDrop = paletteDragDrop;
_renderer = renderer;
ScreenRect = target.ScreenRect;
DrawRect = target.DrawRect;
_hintToTarget = new HintToTarget
{
{ target.Hint& DragTargetHint.ExcludeFlags, target }
};
ExcludeCluster = (target.Hint & DragTargetHint.ExcludeCluster) == DragTargetHint.ExcludeCluster;
}
/// <summary>
/// Add the new target to the cluster.
/// </summary>
/// <param name="target">Target to add into cluster.</param>
public void Add(DragTarget target)
{
// Find the hint that excludes extra flags
DragTargetHint hint = target.Hint & DragTargetHint.ExcludeFlags;
// Can only add one of each hint value
if (!_hintToTarget.ContainsKey(hint))
{
_hintToTarget.Add(hint, target);
// Make sure the drawing rectangle encloses all targets
DrawRect = Rectangle.Union(DrawRect, target.DrawRect);
}
}
/// <summary>
/// Called to request feedback be shown for the specified target.
/// </summary>
/// <param name="screenPt">Current screen point of mouse.</param>
/// <param name="target">Target that needs feedback.</param>
/// <returns>Updated drag target.</returns>
public override DragTarget Feedback(Point screenPt, DragTarget target)
{
// If the current target no longer matches the new point, we need a new target.
if ((target != null) && !target.IsMatch(screenPt, PageDragEndData))
{
target = null;
}
// Only find a new target if we do not already have a target
if (target == null)
{
target = FindTarget(screenPt, PageDragEndData);
}
if (_solid != null)
{
_solid.SolidRect = (target != null) ? target.DrawRect : Rectangle.Empty;
}
return(target);
}
/// <summary>
/// Called to request feedback be shown for the specified target.
/// </summary>
/// <param name="screenPt">Current screen point of mouse.</param>
/// <param name="target">Target that needs feedback.</param>
/// <returns>Updated drag target.</returns>
public override DragTarget Feedback(Point screenPt, DragTarget target)
{
DragTarget matchTarget = null;
// Update each cluster so it shows/hides docking indicators based on mouse position
foreach (DockCluster cluster in _clusters)
{
DragTarget clusterTarget = cluster.Feedback(screenPt, _dragFeedback);
// We use the first matching target found in a cluster
if ((clusterTarget != null) && (matchTarget == null))
{
matchTarget = clusterTarget;
}
}
// Update the solid feedback rectangle with area of the specific target
if (_solid != null)
{
_solid.SolidRect = (matchTarget != null) ? matchTarget.DrawRect : Rectangle.Empty;
}
return(matchTarget);
}
/// <summary> /// Called to request feedback be shown for the specified target. /// </summary> /// <param name="screenPt">Current screen point of mouse.</param> /// <param name="target">Target that needs feedback.</param> /// <returns>Updated drag target.</returns> public abstract DragTarget Feedback(Point screenPt, DragTarget target);
