Class RotationController

Represents a controller that manages rotation interactions for selected diagram objects.

Inheritance
System.Object
CommonController
InteractionControllerBase
RotationController
Inherited Members
Namespace: Syncfusion.Blazor.Diagram
Assembly: Syncfusion.Blazor.dll
Syntax
public class RotationController : InteractionControllerBase
Remarks

The RotationController handles mouse events to rotate selected objects by dragging rotation handles and automatically calculates rotation angles based on mouse movement.

Supports both single and multiple object selection with visual feedback during rotation operations.

Methods

OnMouseDown(DiagramMouseEventArgs)

Handles the mouse down event that occurs when the user presses the mouse button over a selector rotation handle.

Declaration
public override void OnMouseDown(DiagramMouseEventArgs args)
Parameters
Type Name Description
DiagramMouseEventArgs args

A DiagramMouseEventArgs containing mouse event information including cursor position and button state.
Overrides
Remarks

Initiates rotation operation by capturing initial mouse position and preparing rotation state for selected elements.

OnMouseLeave(DiagramMouseEventArgs)

Handles the mouse leave event that occurs when the user moves the cursor away from the selector's rotating handles during a rotation operation.

Declaration
public override void OnMouseLeave(DiagramMouseEventArgs args)
Parameters
Type Name Description
DiagramMouseEventArgs args

A DiagramMouseEventArgs containing mouse event information. Can be null.
Overrides
Remarks

Automatically invoked when the mouse leaves rotation handles during an active rotation. If InAction property is true, delegates to OnMouseUp(DiagramMouseEventArgs) to complete the operation.

OnMouseMove(DiagramMouseEventArgs)

Handles mouse move events that occur while the user drags rotation handles to rotate selected diagram elements.

Declaration
public override bool OnMouseMove(DiagramMouseEventArgs args)
Parameters
Type Name Description
DiagramMouseEventArgs args

A DiagramMouseEventArgs containing mouse event information including cursor position and button state.
Returns
Type Description
System.Boolean

A System.Boolean indicating whether the event was handled. Returns true to block further processing.
Overrides
Remarks

Called continuously during rotation operations to calculate rotation angle based on mouse position.

Automatically invoked by the SfDiagramComponent during rotation interactions.

OnMouseUp(DiagramMouseEventArgs)

Handles the mouse up event that occurs when the user releases the mouse button over a selector rotation handle, completing the rotation operation.

Declaration
public override void OnMouseUp(DiagramMouseEventArgs args)
Parameters
Type Name Description
DiagramMouseEventArgs args

A DiagramMouseEventArgs containing mouse event information. Can be null.
Overrides
Remarks

Called when the user completes a rotation operation by releasing the mouse button after dragging a rotation handle.

Automatically invoked by the SfDiagramComponent to finalize rotation interactions and update diagram state.