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# OnAfterDblClick Method of the IImageViewerEvents Interface

> OnAfterDblClick method of the IImageViewerEvents Interface in ABBYY FineReader Engine Visual Components on Windows — This method is implemented on the client-side.

This method is implemented on the client-side. It is called by ABBYY FineReader Engine after a position in a recognized block has been double-clicked in [Image Viewer](/fine-reader/engine/visual-components-reference/imageviewer).

The method delivers to the client the index of the double-clicked block and the coordinates of the point in it.

## Syntax

### C++

```cpp theme={null}
HRESULT OnAfterDblClick(
  int BlockIndex,
  int X,
  int Y
);
```

### C\#

```csharp theme={null}
void OnAfterDblClick(
  int BlockIndex,
  int X,
  int Y
);
```

### Visual Basic .NET

```vb theme={null}
Sub OnAfterDblClick( _
  BlockIndex As Integer, _
  X As Integer, _
  Y As Integer _
)
```

## Parameters

BlockIndex

\[in] Specifies the index of the block which has been double-clicked. The index is in the [ILayout::VisualBlocks](/fine-reader/engine/api-reference/layout-related-objects/layout#visualblocks) collection.

X

\[in] Specifies the horizontal coordinate of the mouse pointer in pixels. The coordinates are relative to the document image.

Y

\[in] Specifies the vertical coordinate of the mouse pointer in pixels. The coordinates are relative to the document image.

## Return values

This method has no specific return values. It returns the [standard return values of ABBYY FineReader Engine functions](/fine-reader/engine/api-reference/return-codes).

## Remarks

The client implementation of this method must assure that all exceptions thrown inside the method are caught and handled and no exceptions are propagated outside the method. Propagation of an exception outside the method may lead to unpredictable results (such as program termination).

## See also

[IImageViewerEvents](/fine-reader/engine/visual-components-reference/iimageviewerevents)