/// <summary>
/// Displaye <see cref="DiagramItem"/> objects according to given diagram definition
/// </summary>
/// <param name="diagramDefinition">Definition of diagram with items to display</param>
/// <param name="context">Context available for diagram definition</param>
private void displayItems(DiagramDefinition diagramDefinition, DiagramContext context)
{
foreach (var definition in context.RootItemDefinitions)
{
var item = new DiagramItem(definition, context);
InitializeItemDrawing(item);
}
if (!diagramDefinition.ShowJoinLines)
{
return;
}
//show join lines
foreach (var joinDefinition in diagramDefinition.JoinDefinitions)
{
foreach (var from in Engine.DefiningItems(joinDefinition.From))
{
foreach (var to in Engine.DefiningItems(joinDefinition.To))
{
var join = _diagramFactory.CreateJoin(joinDefinition, context);
Engine.AddJoin(join, from, to);
}
}
}
}
/// <summary>
/// Display diagram specified by given definition
/// </summary>
/// <param name="diagramDefinition">Diagram definition to be displayed</param>
/// <returns>Context of displayed diagram</returns>
public DiagramContext Display(DiagramDefinition diagramDefinition)
{
_currentDiagram = diagramDefinition;
Engine.Clear();
if (diagramDefinition == null)
{
return(null);
}
var context = new DiagramContext(this, diagramDefinition);
displayItems(diagramDefinition, context);
var menu = createContextMenu(diagramDefinition, context);
//context menu handling
Engine.Output.ContextMenu = menu;
if (_lastContextMenuHandler != null)
{
Engine.Output.ContextMenuOpening -= _lastContextMenuHandler;
}
_lastContextMenuHandler = (s, e) => menu_ContextMenuOpening(menu, context);
Engine.Output.ContextMenuOpening += _lastContextMenuHandler;
Engine.Output.SetContext(context);
Engine.Display();
return(context);
}
/// <summary>
/// Create context menu according to edits and commands in given definition
/// </summary>
/// <param name="diagramDefinition">Definitin of diagram</param>
/// <param name="context">Context available for diagram definition</param>
/// <returns>Created context menu</returns>
private ContextMenu createContextMenu(DiagramDefinition diagramDefinition, DiagramContext context)
{
var menu = new ContextMenu();
//add edit entries
foreach (var edit in diagramDefinition.Edits)
{
if (!edit.IsActive(diagramDefinition.InitialView))
{
continue;
}
var item = createEditItem(edit, context);
menu.Items.Add(item);
}
foreach (var menuProvider in diagramDefinition.MenuProviders)
{
var item = new MenuItem();
item.Header = menuProvider.Key;
item.Tag = menuProvider.Value;
menu.Items.Add(item);
}
//add command entries
foreach (var command in diagramDefinition.Commands)
{
var item = new MenuItem();
item.Header = command.Name;
item.Click += (e, s) => command.Command();
menu.Items.Add(item);
}
return(menu);
}
/// <summary>
/// Initializes a new instance of the <see cref="DiagramContext"/> class.
/// </summary>
/// <param name="provider">The drawings provider.</param>
/// <param name="diagram">The diagram definition.</param>
internal DiagramContext(DrawingProvider provider, DiagramDefinition diagram)
{
Provider = provider;
Diagram = diagram;
}