//*************************************************************************
// Constructor: NodeXLControl()
//
/// <summary>
/// Initializes a new instance of the <see cref="NodeXLControl" /> class.
/// </summary>
//*************************************************************************
public NodeXLControl()
{
m_oGraph = new Graph();
m_oGraphDrawer = new GraphDrawer(this);
m_oAsyncLayout = new FruchtermanReingoldLayout();
OnNewLayout(m_oAsyncLayout);
m_oLastLayoutContext =
new LayoutContext(System.Drawing.Rectangle.Empty);
m_oLastGraphDrawingContext = null;
m_eLayoutState = LayoutState.Stable;
m_eMouseMode = MouseMode.Select;
m_bMouseAlsoSelectsIncidentEdges = true;
m_bAllowVertexDrag = true;
m_oVerticesBeingDragged = null;
m_oMarqueeBeingDragged = null;
m_oTranslationBeingDragged = null;
m_oSelectedVertices = new HashSet<IVertex>();
m_oSelectedEdges = new HashSet<IEdge>();
m_oCollapsedGroups = new Dictionary<String, IVertex>();
m_oDoubleClickedVertexInfo = null;
m_bShowVertexToolTips = false;
m_oLastMouseMoveLocation = new Point(-1, -1);
// Create a helper object for displaying vertex tooltips.
CreateVertexToolTipTracker();
m_oVertexToolTip = null;
m_bGraphZoomCentered = false;
this.AddLogicalChild(m_oGraphDrawer.VisualCollection);
CreateTransforms();
// Prevent a focus rectangle from being drawn around the control when
// it captures keyboard focus. The focus rectangle does not behave
// properly when the layout and render transforms are applied --
// sometimes the rectangle disappears, and sometimes it gets magnified
// by the render layout.
this.FocusVisualStyle = null;
// AssertValid();
}
//*************************************************************************
// Method: StartTranslationDrag()
//
/// <summary>
/// Starts a translation drag operation.
/// </summary>
///
/// <param name="oMouseLocation">
/// Mouse location, relative to the control.
/// </param>
//*************************************************************************
protected void StartTranslationDrag(
Point oMouseLocation
)
{
AssertValid();
// Save the mouse location for use within the MouseMove event.
TranslateTransform oTranslateTransform =
this.TranslateTransformForRender;
m_oTranslationBeingDragged = new DraggedTranslation(oMouseLocation,
this.PointToScreen(oMouseLocation), oTranslateTransform.X,
oTranslateTransform.Y);
this.Cursor = Cursors.Hand;
Mouse.Capture(this);
}
//*************************************************************************
// Method: CheckForTranslationDragOnMouseUp()
//
/// <summary>
/// Checks for a translation drag operation during the MouseUp event.
/// </summary>
///
/// <param name="oMouseEventArgs">
/// Standard mouse event arguments.
/// </param>
//*************************************************************************
protected void CheckForTranslationDragOnMouseUp(
MouseEventArgs oMouseEventArgs
)
{
Debug.Assert(oMouseEventArgs != null);
AssertValid();
// (Nothing further needs to be done for a translation drag on mouse
// up.)
m_oTranslationBeingDragged = null;
}