/// <summary>
/// Registers the <see cref="GraphEditorInputMode"/> as the <see cref="CanvasControl.InputMode"/>
/// and initializes the marquee input mode that clears the area of the marquee rectangle.
/// </summary>
private void InitializeInputModes()
{
// enable undo/redo support
GraphControl.Graph.SetUndoEngineEnabled(true);
// create an input mode to edit graphs
var editMode = new GraphEditorInputMode();
// create an input mode to clear the area of a marquee rectangle
// using the right mouse button
var marqueeClearInputMode = new MarqueeSelectionInputMode {
PressedRecognizer = MouseEventRecognizers.RightPressed,
DraggedRecognizer = MouseEventRecognizers.RightDragged,
ReleasedRecognizer = MouseEventRecognizers.RightReleased,
CancelRecognizer = KeyEventRecognizers.EscapePressed.Or(MouseEventRecognizers.LostCaptureDuringDrag),
Template = GraphControl.FindResource(ClearRectTemplateKey) as DataTemplate
};
// handle dragging the marquee
marqueeClearInputMode.DragStarting += OnDragStarting;
marqueeClearInputMode.Dragged += OnDragged;
marqueeClearInputMode.DragCanceled += OnDragCanceled;
marqueeClearInputMode.DragFinished += OnDragFinished;
// add this mode to the edit mode
editMode.Add(marqueeClearInputMode);
// and install the edit mode into the canvas
GraphControl.InputMode = editMode;
}