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# wxBufferedPaintDC (wx v2.5.4)

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This is a subclass of `wxBufferedDC` which can be used inside of an `EVT\_PAINT()` event handler to achieve double-buffered drawing.

Just use this class instead of `wxPaintDC` and make sure `wxWindow:setBackgroundStyle/2` is called with wxBG_STYLE_PAINT somewhere in the class initialization code, and that's all you have to do to (mostly) avoid flicker. The only thing to watch out for is that if you are using this class together with `wxScrolled` (not implemented in wx), you probably do `not` want to call `wxScrolledWindow:prepareDC/2` on it as it already does this internally for the real underlying `wxPaintDC`.

See:

- `wxDC`

- `wxBufferedDC`

- `wxPaintDC`

This class is derived, and can use functions, from:

- `wxBufferedDC`

- `wxMemoryDC`

- `wxDC`

wxWidgets docs: wxBufferedPaintDC

## Summary

### Types

wxBufferedPaintDC()

### Functions

destroy(This)

Destroys the object

new(Window)

Equivalent to `new(Window, [])`.

new/2
new/3

As with `wxBufferedDC`, you may either provide the bitmap to be used for buffering or let this object create one internally (in the latter case, the size of the client part of the window is used).

## Types

# wxBufferedPaintDC()

    -type wxBufferedPaintDC() :: wx:wx_object().

## Functions

# destroy(This)

    -spec destroy(This :: wxBufferedPaintDC()) -> ok.

Destroys the object

# new(Window)

    -spec new(Window) -> wxBufferedPaintDC() when Window :: wxWindow:wxWindow().

Equivalent to `new(Window, [])`.

# new/2

    -spec new(Window, Buffer) -> wxBufferedPaintDC()
                 when Window :: wxWindow:wxWindow(), Buffer :: wxBitmap:wxBitmap();
             (Window, [Option]) -> wxBufferedPaintDC()
                 when Window :: wxWindow:wxWindow(), Option :: {style, integer()}.

# new/3

    -spec new(Window, Buffer, [Option]) -> wxBufferedPaintDC()
                 when
                     Window :: wxWindow:wxWindow(),
                     Buffer :: wxBitmap:wxBitmap(),
                     Option :: {style, integer()}.

As with `wxBufferedDC`, you may either provide the bitmap to be used for buffering or let this object create one internally (in the latter case, the size of the client part of the window is used).

Pass wxBUFFER_CLIENT_AREA for the `style` parameter to indicate that just the client area of the window is buffered, or wxBUFFER_VIRTUAL_AREA to indicate that the buffer bitmap covers the virtual area.