/// <summary>
/// Initializes a new instance of the <see cref="VisjectContextNavigationButton"/> class.
/// </summary>
/// <param name="surface">The parent surface.</param>
/// <param name="context">The target context.</param>
/// <param name="x">The x position.</param>
/// <param name="y">The y position.</param>
/// <param name="height">The height.</param>
public VisjectContextNavigationButton(VisjectSurface surface, ISurfaceContext context, float x, float y, float height)
: base(x, y, height)
{
Surface = surface;
Context = context;
Text = context.SurfaceName + "/";
}
/// <summary>
/// Changes the current opened context to the given one. Used as a navigation method.
/// </summary>
/// <param name="context">The target context.</param>
public void ChangeContext(ISurfaceContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (_context == null)
{
OpenContext(context);
return;
}
if (_context.Context == context)
{
return;
}
// Check if already in a path
if (_contextCache.TryGetValue(context, out VisjectSurfaceContext surfaceContext) && ContextStack.Contains(surfaceContext))
{
// Change stack
do
{
ContextStack.Pop();
} while (ContextStack.Peek() != surfaceContext);
}
else
{
// TODO: implement this case (need to find first parent of the context that is in path)
throw new NotSupportedException("TODO: support changing context to one not in the active path");
}
// Update
OnContextChanged();
}
/// <summary>
/// Initializes a new instance of the <see cref="VisjectSurfaceContext"/> class.
/// </summary>
/// <param name="surface">The Visject surface using this context.</param>
/// <param name="parent">The parent context. Defines the higher key surface graph context. May be null for the top-level context.</param>
/// <param name="context">The context.</param>
/// <param name="rootControl">The surface root control.</param>
public VisjectSurfaceContext(VisjectSurface surface, VisjectSurfaceContext parent, ISurfaceContext context, SurfaceRootControl rootControl)
{
_surface = surface;
Parent = parent;
Context = context ?? throw new ArgumentNullException(nameof(context));
RootControl = rootControl ?? throw new ArgumentNullException(nameof(rootControl));
// Set initial scale to provide nice zoom in effect on startup
RootControl.Scale = new Vector2(0.5f);
}
/// <summary>
/// Opens the child context of the current context.
/// </summary>
/// <param name="context">The context.</param>
public void OpenContext(ISurfaceContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (_context != null && _context.Context == context)
{
return;
}
// Get or create context
VisjectSurfaceContext surfaceContext;
if (!_contextCache.TryGetValue(context, out surfaceContext))
{
surfaceContext = CreateContext(_context, context);
_context?.Children.Add(surfaceContext);
_contextCache.Add(context, surfaceContext);
context.OnContextCreated(surfaceContext);
// Load context
if (_root != null)
{
if (surfaceContext.Load())
{
throw new Exception("Failed to load graph.");
}
}
}
if (_root == null)
{
_root = surfaceContext;
}
else if (ContextStack.Contains(surfaceContext))
{
throw new ArgumentException("Context has been already added to the stack.");
}
// Change stack
ContextStack.Push(surfaceContext);
// Update
OnContextChanged();
}
/// <summary>
/// Removes the context from the surface and any related cached data.
/// </summary>
/// <param name="context">The context.</param>
public void RemoveContext(ISurfaceContext context)
{
// Skip if surface is already disposing
if (IsDisposing || _isReleasing)
{
return;
}
// Validate input
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
// Removing root requires to close every context
if (RootContext != null && context == RootContext.Context)
{
while (ContextStack.Count > 0)
{
CloseContext();
}
}
// Check if has context in cache
VisjectSurfaceContext surfaceContext;
if (_contextCache.TryGetValue(context, out surfaceContext))
{
// Remove from navigation path
while (ContextStack.Contains(surfaceContext))
{
CloseContext();
}
// Dispose
surfaceContext.Clear();
_contextCache.Remove(context);
}
}
/// <summary>
/// Creates the Visject surface context for the given surface data source context.
/// </summary>
/// <param name="parent">The parent context.</param>
/// <param name="context">The context.</param>
/// <returns></returns>
protected virtual VisjectSurfaceContext CreateContext(VisjectSurfaceContext parent, ISurfaceContext context)
{
return(new VisjectSurfaceContext(this, parent, context));
}
/// <summary>
/// Initializes a new instance of the <see cref="VisjectSurfaceContext"/> class.
/// </summary>
/// <param name="surface">The Visject surface using this context.</param>
/// <param name="parent">The parent context. Defines the higher key surface graph context. May be null for the top-level context.</param>
/// <param name="context">The context.</param>
public VisjectSurfaceContext(VisjectSurface surface, VisjectSurfaceContext parent, ISurfaceContext context)
: this(surface, parent, context, new SurfaceRootControl())
{
}
