/// <summary>
/// Method to restict the undo redo command from history manager.
/// </summary>
/// <param name="parameter"></param>
private void OnRestrictUndoRedoCommandExecute(object parameter)
{
if (this != null)
{
if ((bool)parameter)
{
NodeVm selectedNode = ((IEnumerable <object>)(this.SelectedItems as SelectorViewModel).Nodes).FirstOrDefault() as NodeVm;
if (selectedNode != null)
{
selectedNode.CanLogmultipleselect = false;
}
}
else
{
NodeVm selectedNode = ((IEnumerable <object>)(this.SelectedItems as SelectorViewModel).Nodes).FirstOrDefault() as NodeVm;
if (selectedNode != null)
{
selectedNode.CanLogmultipleselect = true;
}
}
}
}
public HistoryViewModel()
{
//Initialize the nodes and connectors.
this.Nodes = new ObservableCollection <NodeVm>();
this.Connectors = new ConnectorCollection();
//Initialize the rulers.
this.HorizontalRuler = new Syncfusion.UI.Xaml.Diagram.Controls.Ruler();
this.VerticalRuler = new Syncfusion.UI.Xaml.Diagram.Controls.Ruler()
{
Orientation = Orientation.Vertical,
};
//Initialize the history manager.
this.HistoryManager = new HistoryManagerViewModel();
//Creating the NodeViewModel
NodeVm redNode = new NodeVm()
{
UnitWidth = 100,
UnitHeight = 100,
OffsetX = 100,
OffsetY = 160,
//Specify shape to the Node from built-in Shape Dictionary
Shape = App.Current.Resources["Ellipse"],
Fill = new SolidColorBrush(Colors.LightPink),
};
NodeVm blackNode = new NodeVm()
{
UnitWidth = 100,
UnitHeight = 100,
OffsetX = 250,
OffsetY = 160,
//Specify shape to the Node from built-in Shape Dictionary
Shape = App.Current.Resources["Ellipse"],
Fill = new SolidColorBrush(Colors.LightBlue),
};
NodeVm greenNode = new NodeVm()
{
UnitWidth = 100,
UnitHeight = 100,
OffsetX = 400,
OffsetY = 160,
//Specify shape to the Node from built-in Shape Dictionary
Shape = App.Current.Resources["Ellipse"],
Fill = new SolidColorBrush(Colors.LightGray),
};
//Add Node to Nodes property of the Diagram
(this.Nodes as ObservableCollection <NodeVm>).Add(redNode);
(this.Nodes as ObservableCollection <NodeVm>).Add(blackNode);
(this.Nodes as ObservableCollection <NodeVm>).Add(greenNode);
//Enable the undo constraint
this.Constraints = GraphConstraints.Default | GraphConstraints.Undoable;
//Initialize the command to execute the undo redo values
ChangeNodeColorCommand = new Command(OnChangeNodeColorCommandExecute);
UndoCommand = new Command(OnUndoCommandExecute);
RedoCommand = new Command(OnRedoCommandExecute);
RestrictUndoRedoCommand = new Command(OnRestrictUndoRedoCommandExecute);
//Initialize the selected items.
this.SelectedItems = new SelectorViewModel()
{
};
//Restrict the quick command and rotator command.
(this.SelectedItems as SelectorViewModel).SelectorConstraints &= ~(SelectorConstraints.QuickCommands | SelectorConstraints.Rotator);
}