//*************************************************************************
// Method: VertexToolTipTracker_ShowToolTip()
//
/// <summary>
/// Handles the ShowToolTip event on the m_oVertexToolTipTracker object.
/// </summary>
///
/// <param name="oSource">
/// Standard event arguments.
/// </param>
///
/// <param name="oToolTipTrackerEventArgs">
/// Standard event arguments.
/// </param>
//*************************************************************************
private void VertexToolTipTracker_ShowToolTip(
Object oSource,
ToolTipTrackerEventArgs oToolTipTrackerEventArgs
)
{
AssertValid();
// Get the vertex that was hovered over.
Debug.Assert(oToolTipTrackerEventArgs.Object is IVertex);
IVertex oVertex = (IVertex)oToolTipTrackerEventArgs.Object;
// Fire a VertexMouseHover event in case the application wants to take
// additional action.
FireVertexMouseHover(oVertex);
if (!m_bShowVertexToolTips)
{
// Vertex tooltips aren't being shown, so no additional action is
// required.
return;
}
// Give PreviewVertexToolTipShown event handlers an opportunity to
// override the default tooltip.
VertexToolTipShownEventArgs oVertexToolTipShownEventArgs =
new VertexToolTipShownEventArgs(oVertex);
FirePreviewVertexToolTipShown(oVertexToolTipShownEventArgs);
m_oVertexToolTip = oVertexToolTipShownEventArgs.VertexToolTip;
if (m_oVertexToolTip == null)
{
// There was no default tooltip override. Does the vertex have a
// tooltip string stored in its metadata?
Object oVertexToolTipAsObject;
if ( !oVertex.TryGetValue(ReservedMetadataKeys.VertexToolTip,
typeof(String), out oVertexToolTipAsObject) )
{
// No. Nothing needs to be done.
return;
}
// Create a default tooltip.
m_oVertexToolTip = CreateDefaultVertexToolTip(
(String)oVertexToolTipAsObject);
}
// The tooltip shouldn't zoom. Compensate for a zoomed graph by
// scaling the tooltip with the graph zoom's inverse.
Double dScale = 1.0 / this.ScaleTransformForRender.ScaleX;
m_oVertexToolTip.RenderTransform = new ScaleTransform(dScale, dScale);
m_oGraphDrawer.AddVisualOnTopOfGraph(m_oVertexToolTip);
// If this isn't called, MeasureOverride() may not be called and
// m_oVertexToolTip won't get sized.
this.InvalidateMeasure();
}
//*************************************************************************
// Method: VertexToolTipTracker_HideToolTip()
//
/// <summary>
/// Handles the HideToolTip event on the m_oVertexToolTipTracker object.
/// </summary>
///
/// <param name="oSource">
/// Standard event arguments.
/// </param>
///
/// <param name="oToolTipTrackerEventArgs">
/// Standard event arguments.
/// </param>
//*************************************************************************
private void VertexToolTipTracker_HideToolTip(
Object oSource,
ToolTipTrackerEventArgs oToolTipTrackerEventArgs
)
{
AssertValid();
FireVertexMouseLeave();
if (m_bShowVertexToolTips)
{
RemoveVertexToolTip();
}
}