private ItemsCanvas GetItemsCanvas(Node node)
{
// First try get existing items canvas
if (node.ItemsCanvas != null)
{
return(node.ItemsCanvas);
}
// The node does not yet have a canvas. So we need to get the parent canvas and
// then create a child canvas for this node.
ItemsCanvas parentCanvas = GetItemsCanvas(node.Parent);
// Creating the child canvas to be the children canvas of the node
node.ItemsCanvas = new ItemsCanvas(node.ViewModel, parentCanvas);
node.ViewModel.ItemsViewModel = new ItemsViewModel(
node.ItemsCanvas, node.ViewModel);
if (Math.Abs(node.ScaleFactor) > 0.0000001)
{
node.ItemsCanvas.ScaleFactor = node.ScaleFactor;
}
//if (node.Offset != PointEx.Zero)
//{
// node.ItemsCanvas.SetMoveOffset(node.Offset);
//}
return(node.ItemsCanvas);
}
private static void Zoom(ItemsCanvas itemsCanvas, MouseWheelEventArgs e)
{
double zoomFactor = ZoomFactor(e);
Point zoomCenter = ZoomCenter(itemsCanvas, e);
Zoom(itemsCanvas, zoomFactor, zoomCenter, true);
}
public void ZoomRoot(double zoomFactor)
{
ItemsCanvas rootCanvas = itemsCanvas.RootCanvas;
Point zoomCenter = ZoomCenter(rootCanvas);
Zoom(rootCanvas, zoomFactor, zoomCenter, false);
}
/// <summary>
/// Returns the visual area after all ancestors view areas have been intersected
/// </summary>
private static Rect GetHierarchicalVisualArea(ItemsCanvas canvas)
{
if (canvas.IsRoot)
{
// Reached root, return the root canvas view area
return(GetItemsCanvasViewArea(canvas));
}
if (null == PresentationSource.FromVisual(canvas.ZoomableCanvas))
{
// This canvas is not showing
return(Rect.Empty);
}
Rect parentArea = GetHierarchicalVisualArea(canvas.ParentCanvas);
Point parentCanvasPoint = parentArea.Location;
Point childCanvasPoint = ParentToChildCanvasPoint(canvas, parentCanvasPoint);
Size parentSizeInChildCanvasSize = (Size)((Vector)parentArea.Size / canvas.ScaleFactor);
Rect parentViewAreaInChildCanvasArea = new Rect(childCanvasPoint, parentSizeInChildCanvasSize);
// Intersect parent area with child(this) area
Rect viewArea = GetItemsCanvasViewArea(canvas);
viewArea.Intersect(parentViewAreaInChildCanvasArea);
return(viewArea);
}
private static void UpdateAndNotifyAll(ItemsCanvas itemsCanvas)
{
IReadOnlyList <ItemViewModel> items = itemsCanvas.ItemsSource.GetAllItems().Cast <ItemViewModel>().ToList();
itemsCanvas.ItemsSource.Update(items);
items.ForEach(item => item.NotifyAll());
}
public Operation(
Node targetNode,
ItemsCanvas rootCanvas,
Point rootScreenCenter)
{
RootScreenCenter = rootScreenCenter;
TargetNode = targetNode;
RootCanvas = rootCanvas;
}
private static void ZoomDescendants(ItemsCanvas itemsCanvas)
{
itemsCanvas.Descendants()
.Where(item => item.IsShowing && item.CanShow && item.ZoomableCanvas != null)
.ForEach(item =>
{
SetZoomableCanvasScale(item);
NotifyAllItems(item);
});
}
private static Point GetRootScreenCenter(Node rootNode)
{
// Returns the center of the root screen
ItemsCanvas rootCanvas = rootNode.ItemsCanvas;
Rect rootArea = rootCanvas.ItemsCanvasBounds;
Point rootCenter = new Point(
rootArea.Left + rootArea.Width / 2.0,
rootArea.Top + rootArea.Height / 2.0);
return(rootCanvas.CanvasToScreenPoint(rootCenter));
}
private static void SetZoomableCanvasScale(ItemsCanvas itemsCanvas, Point zoomCenter)
{
// Adjust the offset to make the point at the center of zoom area stay still
double zoomFactor = itemsCanvas.Scale / itemsCanvas.ZoomableCanvas.Scale;
Vector position = (Vector)zoomCenter;
Vector moveOffset = position * zoomFactor - position;
itemsCanvas.MoveAllItems(-moveOffset);
itemsCanvas.ZoomableCanvas.Scale = itemsCanvas.Scale;
}
public ModelViewModel(
IModelViewModelService modelViewModelService,
ModelMetadata modelMetadata)
{
this.modelViewModelService = modelViewModelService;
this.modelMetadata = modelMetadata;
ItemsCanvas rootCanvas = new ItemsCanvas();
ItemsViewModel = new ItemsViewModel(rootCanvas);
modelViewModelService.SetRootCanvas(rootCanvas);
}
void Awake()
{
if (Instance == null)
{
Instance = this;
}
else if (Instance != this)
{
Destroy(gameObject);
}
DontDestroyOnLoad(gameObject);
}
private static Point ZoomCenter(ItemsCanvas itemsCanvas)
{
ZoomableCanvas zoomableCanvas = itemsCanvas.ZoomableCanvas;
Point viewCenter = new Point(zoomableCanvas.ActualWidth / 2.0, zoomableCanvas.ActualHeight / 2.0);
Point zoomCenter = viewCenter + (Vector)zoomableCanvas.Offset;
if (itemsCanvas.IsRoot)
{
// Compensate for root center offset to windows
zoomCenter -= new Vector(10, 10);
}
return(zoomCenter);
}
public void RemoveAll()
{
ItemsCanvas rootCanvas = Root.ItemsCanvas;
nodes.Clear();
AddRoot();
Root.ItemsCanvas = rootCanvas;
if (IsChangeMonitored)
{
DataModified?.Invoke(this, EventArgs.Empty);
}
}
public void OnMouseWheel(
NodeViewModel nodeViewModel,
UIElement uiElement,
MouseWheelEventArgs e)
{
ItemsCanvas itemsCanvas = nodeViewModel.ItemsViewModel?.ItemsCanvas ?? nodeViewModel.Node.Root.ItemsCanvas;
if (nodeViewModel.IsInnerSelected)
{
itemsCanvas.Zoom(e);
}
else
{
itemsCanvas.RootCanvas.Zoom(e);
}
}
private static Point ScreenToCanvasPoint(ItemsCanvas canvas, Point screenPoint)
{
try
{
Point localScreenPoint = canvas.ZoomableCanvas.PointFromScreen(screenPoint);
Point canvasPoint = canvas.ZoomableCanvas.GetCanvasPoint(localScreenPoint);
return(canvasPoint);
}
catch (Exception e)
{
Log.Exception(e, $"Node {canvas}");
throw;
}
}
private void AddNodeToParentCanvas(Node node, Node parentNode)
{
try
{
layoutService.SetLayout(node.ViewModel);
ItemsCanvas parentCanvas = parentNode.ItemsCanvas;
parentCanvas.AddItem(node.ViewModel);
}
catch (Exception e)
{
Log.Exception(e, $"Failed adding {node} to parent {parentNode}");
throw;
}
}
private static void Zoom(
ItemsCanvas itemsCanvas, double zoomFactor, Point zoomCenter, bool isManual)
{
double newScale = itemsCanvas.Scale * zoomFactor;
if (isManual && !IsValidZoomScale(zoomFactor, newScale))
{
return;
}
if (itemsCanvas.IsRoot)
{
itemsCanvas.RootScale = newScale;
}
else
{
itemsCanvas.ScaleFactor = newScale / itemsCanvas.ParentCanvas.Scale;
}
UpdateScale(itemsCanvas, zoomCenter);
}
private static Rect GetItemsCanvasViewArea(ItemsCanvas canvas)
{
double scale = canvas.Scale;
double parentScale = canvas.ParentCanvas?.Scale ?? scale;
Size renderSize = (Size)((Vector)canvas.ItemsCanvasBounds.Size * parentScale);
double x = 0;
double y = 0;
if (canvas.IsRoot)
{
x = canvas.ZoomableCanvas.Offset.X;
y = canvas.ZoomableCanvas.Offset.Y;
}
Rect value = new Rect(
x / scale,
y / scale,
renderSize.Width / scale,
renderSize.Height / scale);
return(value);
}
public void SetRootCanvas(ItemsCanvas rootCanvas) => Root.ItemsCanvas = rootCanvas;
public VisualAreaHandler(ItemsCanvas itemsCanvas)
{
this.itemsCanvas = itemsCanvas;
}
private static void UpdateScale(ItemsCanvas itemsCanvas, Point zoomCenter)
{
SetZoomableCanvasScale(itemsCanvas, zoomCenter);
UpdateAndNotifyAll(itemsCanvas);
ZoomDescendants(itemsCanvas);
}
private static Point ParentToChildCanvasPoint(ItemsCanvas canvas, Point parentCanvasPoint)
{
Point parentScreenPoint = canvas.ParentCanvas.CanvasToScreenPoint(parentCanvasPoint);
return(ScreenToCanvasPoint(canvas, parentScreenPoint));
}
public ItemsCanvasZoom(ItemsCanvas itemsCanvas)
{
this.itemsCanvas = itemsCanvas;
}
public void SetRootCanvas(ItemsCanvas rootCanvas)
{
rootNodeCanvas = rootCanvas;
modelHandlingService.SetRootCanvas(rootCanvas);
}
private static Point ZoomCenter(ItemsCanvas itemsCanvas, MouseWheelEventArgs e)
{
Point viewPosition = e.GetPosition(itemsCanvas.ZoomableCanvas);
return(viewPosition + (Vector)itemsCanvas.ZoomableCanvas.Offset);
}
private static void NotifyAllItems(ItemsCanvas itemsCanvas) => itemsCanvas.ItemsSource.GetAllItems().Cast <ItemViewModel>().ForEach(item => item.NotifyAll());
private static void SetZoomableCanvasScale(ItemsCanvas itemsCanvas) => itemsCanvas.ZoomableCanvas.Scale = itemsCanvas.Scale;