public override void Initialize()
{
PRoot root = Canvas.Root;
PCamera camera = Canvas.Camera;
//PLayer gridLayer = new GridLayer();
// replace standard layer with grid layer.
root.RemoveChild(camera.GetLayer(0));
camera.RemoveLayer(0);
root.AddChild(gridLayer);
camera.AddLayer(gridLayer);
// add constraints so that grid layers bounds always match cameras view bounds. This makes
// it look like an infinite grid.
camera.BoundsChanged += new PPropertyEventHandler(camera_BoundsChanged);
camera.ViewTransformChanged += new PPropertyEventHandler(camera_ViewTransformChanged);
gridLayer.Bounds = camera.ViewBounds;
PNode n = new PNode();
n.Brush = Color.Blue;
n.SetBounds(0, 0, 100, 80);
Canvas.Layer.AddChild(n);
Canvas.RemoveInputEventListener(Canvas.PanEventHandler);
Canvas.AddInputEventListener(new GridDragHandler(Canvas));
}
/// <summary>
/// Determines if the specified node is selectable (i.e., if it is a child
/// of a node in the list of selectable parents).
/// </summary>
/// <param name="node">The node to test.</param>
/// <returns>True if the node is selectable; otherwise, false.</returns>
protected virtual bool IsSelectable(PNode node)
{
bool selectable = false;
foreach (PNode parent in selectableParents)
{
if (parent.ChildrenReference.Contains(node))
{
selectable = true;
break;
}
else if (parent is PCamera)
{
PCamera cameraParent = (PCamera)parent;
for (int i = 0; i < cameraParent.LayerCount; i++)
{
PLayer layer = cameraParent.GetLayer(i);
if (layer.ChildrenReference.Contains(node))
{
selectable = true;
break;
}
}
}
}
return(selectable);
}
/// <summary>
/// Update the marquee bounds based on the given event data.
/// </summary>
/// <param name="e">A PInputEventArgs that contains the event data.</param>
protected virtual void UpdateMarquee(PInputEventArgs e)
{
RectangleF r = RectangleF.Empty;
if (marqueeParent is PCamera)
{
r = PUtil.AddPointToRect(r, canvasPressPt);
r = PUtil.AddPointToRect(r, e.CanvasPosition);
}
else
{
r = PUtil.AddPointToRect(r, presspt);
r = PUtil.AddPointToRect(r, e.Position);
}
r = marquee.GlobalToLocal(r);
marquee.Reset();
SetSafeMarqueePen(r.Width, r.Height);
marquee.AddRectangle(r.X, r.Y, r.Width, r.Height);
r = RectangleF.Empty;
r = PUtil.AddPointToRect(r, presspt);
r = PUtil.AddPointToRect(r, e.Position);
allItems.Clear();
PNodeFilter filter = CreateNodeFilter(r);
foreach (PNode parent in selectableParents)
{
PNodeList items;
if (parent is PCamera)
{
items = new PNodeList();
PCamera cameraParent = (PCamera)parent;
for (int i = 0; i < cameraParent.LayerCount; i++)
{
cameraParent.GetLayer(i).GetAllNodes(filter, items);
}
}
else
{
items = parent.GetAllNodes(filter, null);
}
foreach (PNode node in items)
{
allItems.Add(node, true);
}
}
}