wpf-devexpress-dot-xpf-dot-diagram-dot-diagramcontrol-acd7caa0.md
Fires repeatedly as the end-user hovers over the diagram canvas while a drawing tool (Rectangle, Ellipse, Right Triangle or Hexagon) is selected.
Namespace : DevExpress.Xpf.Diagram
Assembly : DevExpress.Xpf.Diagram.v25.2.dll
NuGet Package : DevExpress.Wpf.Diagram
public event EventHandler<DiagramQueryItemDrawActionEventArgs> QueryItemDrawAction
Public Event QueryItemDrawAction As EventHandler(Of DiagramQueryItemDrawActionEventArgs)
The QueryItemDrawAction event's data class is DiagramQueryItemDrawActionEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Allow | Specifies whether the end-user can use the selected drawing tool. |
| DiagramPoint | Returns the mouse pointer position within the diagram control. |
| Handled | Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs. |
| OriginalSource | Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs. |
| RoutedEvent | Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs. |
| Source | Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs. |
| Tool | Returns the drawing tool that the end-user is attempting to use. |
The event data class exposes the following methods:
| Method | Description |
|---|---|
| InvokeEventHandler(Delegate, Object) | When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs. |
| OnSetSource(Object) | When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs. |
The Allow property specifies whether the end-user can use the selected drawing tool. The Tool property returns the drawing tool that the end-user is attempting to use.
See Also