private void OnContextMenuOpening(object sender, ContextMenuEventArgs e)
{
// If the shift key is down, the the user is dropping the end selection
// marker, so in this case we won't show the context menu.
if ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift)
{
e.Handled = true;
return;
}
// Create a new context menu metadata to be filled by the hit tester
this.contextMenuSources = new Dictionary <ContextMenuItemsSourceType, IContextMenuItemsSource>();
// Run a hit test at the mouse cursor
VisualTreeHelper.HitTest(
this,
null,
new HitTestResultCallback(this.ContextMenuHitTestResult),
new PointHitTestParameters(Mouse.GetPosition(this)));
// If a visualization panel was found, set it as the current visualization panel.
if (this.contextMenuSources.ContainsKey(ContextMenuItemsSourceType.VisualizationPanel))
{
VisualizationPanel visualizationPanel = (this.contextMenuSources[ContextMenuItemsSourceType.VisualizationPanel] as VisualizationPanelView).DataContext as VisualizationPanel;
visualizationPanel.IsTreeNodeSelected = true;
}
// Clear the existing context menu
this.ContextMenu.Items.Clear();
if (this.contextMenuSources.ContainsKey(ContextMenuItemsSourceType.VisualizationPanel))
{
// Find all of the visualization object views that are children of the panel view.
VisualizationPanelView panelView = this.contextMenuSources[ContextMenuItemsSourceType.VisualizationPanel] as VisualizationPanelView;
IEnumerable <VisualizationObjectView> visualizationObjectViews = panelView.FindVisualChildren <VisualizationObjectView>();
IEnumerator <VisualizationObjectView> viewEnumerator = visualizationObjectViews.GetEnumerator();
// If there's only a single visualization object view then insert its context menu items
// inline, otherwise generate a separate cascading menu for each visualization object view.
if (visualizationObjectViews.Count() == 1)
{
viewEnumerator.MoveNext();
this.AddContextMenuItems(viewEnumerator.Current, false);
}
else
{
while (viewEnumerator.MoveNext())
{
this.AddContextMenuItems(viewEnumerator.Current, true);
}
}
}
// Add the context menu items for the visualization panel, instant panel, and visualization conatiner.
foreach (IContextMenuItemsSource panelViewSource in this.contextMenuSources.Values)
{
this.AddContextMenuItems(panelViewSource, false);
}
}
private HitTestFilterBehavior HitTestFilter(DependencyObject dependencyObject)
{
if (dependencyObject is VisualizationPanelView)
{
this.hitTestResult = dependencyObject as VisualizationPanelView;
return(HitTestFilterBehavior.Stop);
}
return(HitTestFilterBehavior.Continue);
}
private HitTestFilterBehavior HitTestFilter(DependencyObject dependencyObject)
{
if (dependencyObject is VisualizationPanelView visualizationPanelView &&
(visualizationPanelView.DataContext as VisualizationPanel).IsShown)
{
this.hitTestResult = visualizationPanelView;
return(HitTestFilterBehavior.Stop);
}
return(HitTestFilterBehavior.Continue);
}
private VisualizationPanel GetVisualizationPanelUnderMouse(Point mousePosition)
{
// Find out if the mouse is above an existing Visualization Panel
this.hitTestResult = null;
VisualTreeHelper.HitTest(
this.Items,
new HitTestFilterCallback(this.HitTestFilter),
new HitTestResultCallback(this.HitTestResultCallback),
new PointHitTestParameters(mousePosition));
// Get the visualization panel that the stream was dropped over (if any)
return(this.hitTestResult != null ? this.hitTestResult.DataContext as VisualizationPanel : null);
}
