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.PerVertexToolTip,
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();
}
m_oNodeXLControl_PreviewVertexToolTipShown
(
object sender,
VertexToolTipShownEventArgs vertexToolTipShownEventArgs
)
{
AddToStatus("PreviewVertexToolTipShown");
#if false
System.Windows.Controls.TextBox oTextBox =
new System.Windows.Controls.TextBox();
oTextBox.MinWidth = 500;
oTextBox.MinHeight = 100;
vertexToolTipShownEventArgs.VertexToolTip = oTextBox;
#endif
}
FirePreviewVertexToolTipShown
(
VertexToolTipShownEventArgs oVertexToolTipShownEventArgs
)
{
Debug.Assert(oVertexToolTipShownEventArgs != null);
AssertValid();
VertexToolTipShownEventHandler oVertexToolTipShownEventHandler =
this.PreviewVertexToolTipShown;
if (oVertexToolTipShownEventHandler != null)
{
oVertexToolTipShownEventHandler(this,
oVertexToolTipShownEventArgs);
}
}
