com.smartgwt.client.widgets.drawing.events

## Interface HasDrawStartHandlers

- All Superinterfaces:
    com.google.gwt.event.shared.HasHandlers
  All Known Implementing Classes:
    DrawBlockConnector, DrawCurve, DrawDiamond, DrawGroup, DrawImage, DrawItem, DrawLabel, DrawLine, DrawLinePath, DrawOval, DrawPane, DrawPath, DrawPolygon, DrawRect, DrawSector, DrawShape, DrawTriangle, FacetChart, Gauge

      public interface HasDrawStartHandlers
      extends com.google.gwt.event.shared.HasHandlers

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `com.google.gwt.event.shared.HandlerRegistration` | `addDrawStartHandler(DrawStartHandler handler)` Called when we start drawing to the underlying HTML5 <canvas> element of a DrawPane, right after the element is cleared.

    - ### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

      `fireEvent`

- - ### Method Detail

    - #### addDrawStartHandler

          com.google.gwt.event.shared.HandlerRegistration addDrawStartHandler(DrawStartHandler handler)

      Called when we start drawing to the underlying HTML5 <canvas> element of a DrawPane, right after the element is cleared. Only called if the `DrawingType` is `DrawingType.BITMAP`.
      Parameters:
        `handler` - the drawStart handler
      Returns:
        `HandlerRegistration` used to remove this handler